JP6885159B2 - Foil transfer device - Google Patents

Description

The present invention relates to a foil transfer device.

Conventionally, there is known a transfer device that forms a toner image on paper, superimposes a metal foil on the toner image, heat-fixes the toner image, and transfers the metal foil (see Patent Document 1 below).

Japanese Unexamined Patent Publication No. 1-200985

However, in the transfer device described in Patent Document 1 described above, the adhesive force between the metal foil and the toner image is insufficient, and a part of the metal foil does not adhere to the toner image, or the metal foil becomes toner over time. It may come off from the image.

Therefore, an object of the present disclosure is to provide a foil transfer device capable of improving the adhesive force between the metal foil and the first toner image.

The foil transfer device of the present invention includes a first image forming unit and a foil transfer unit. The first image forming unit transfers the first toner onto the paper to form the first toner image. The foil transfer unit superimposes a metal foil on the first toner image, and heats the first toner image and the metal foil to transfer the metal foil to the first toner image. The first toner contains at least a binder resin and an adhesive for adhering the paper and the metal foil.

The adhesive contains at least a functional group-containing vinyl monomer containing a tertiary amino group or a quaternary ammonium salt and a copolymer of a vinyl monomer copolymerizable with the functional group-containing vinyl monomer.

When the functional group-containing vinyl monomer contains a quaternary ammonium salt, the content ratio of the quaternary ammonium salt in the first toner is 0.28% by mass or more and 20.0% by mass or less.

When the functional group-containing vinyl monomer contains a tertiary amino group, the content ratio of the tertiary amino group in the first toner is 2.65% by mass or more and 20.0% by mass or less.

According to such a configuration, the first toner contains at least a functional group-containing vinyl monomer containing a tertiary amino group or a quaternary ammonium salt and a copolymer of a vinyl monomer copolymerizable with the functional group-containing vinyl monomer. Contains. The content ratio of the quaternary ammonium salt or the tertiary amino group to the first toner is in the above range.

Therefore, the adhesive strength between the metal foil and the first toner image can be improved, and the adhesive stability of the metal foil with respect to the first toner image can be improved.

According to the foil transfer device of the present invention, it is possible to improve the adhesive force between the metal foil and the first toner image.

FIG. 1 is a schematic configuration diagram of an image forming apparatus as a first embodiment of the foil transfer apparatus of the present invention. FIG. 2 is a flow chart of an embodiment of an image forming process executed by the image forming apparatus shown in FIG. FIG. 3 is a flow chart of an embodiment of the selective foil transfer process shown in FIG. FIG. 4 is a flow chart of an embodiment of the print control process shown in FIG. FIG. 5 is a flow chart of an embodiment of the normal printing process shown in FIG. FIG. 6 is a schematic configuration diagram of an image forming apparatus as a second embodiment of the foil transfer apparatus of the present invention. FIG. 7 is a schematic configuration diagram of an image forming apparatus as a third embodiment of the foil transfer apparatus of the present invention. FIG. 8 is a schematic configuration diagram of an image forming apparatus as a fourth embodiment of the foil transfer apparatus of the present invention. FIG. 9 is a schematic configuration diagram of an image forming apparatus as a fifth embodiment of the foil transfer apparatus of the present invention. FIG. 10 is a schematic configuration diagram of an image forming apparatus as a sixth embodiment of the foil transfer apparatus of the present invention. FIG. 11 is a schematic configuration diagram of a seventh embodiment of the foil transfer device of the present invention.

[First Embodiment]
1. 1. Schematic of the image forming apparatus With reference to FIG. 1, the outline of the image forming apparatus 1 as the first embodiment of the foil transfer apparatus of the present invention will be described.

The image forming apparatus 1 is a direct tandem type color printer. The image forming apparatus 1 includes a main body housing 2, a paper feeding unit 3, a conveying unit 7, a first image forming unit 6, a plurality of second image forming units 4Y, 4M, 4C, an exposure device 5, and the like. It includes a fixing device 8, a foil transfer unit 100, a sensor unit 9, and a control unit 10.

1.1 Main body housing The main body housing 2 constitutes the exterior of the image forming apparatus 1. The main body housing 2 includes a paper feed unit 3, a transport unit 7, a first image forming unit 6, a plurality of second image forming units 4Y, 4M, 4C, an exposure device 5, a fixing device 8, and a foil. The transfer unit 100, the sensor unit 9, and the control unit 10 are housed.

1.2 Paper-feeding unit The paper-feeding unit 3 is configured to supply the paper S to the transport unit 7. The paper feed unit 3 includes a paper feed tray 31 and a plurality of paper feed rollers 32.

The paper feed tray 31 can accommodate the paper S. The paper feed tray 31 is arranged at the bottom of the main body housing 2. The paper feed tray 31 is movable with respect to the main body housing 2.

The plurality of paper feed rollers 32 are configured to supply the paper S accommodated in the paper feed tray 31 to the transport unit 7.

1.3 Transport unit The transport unit 7 is configured to transport the paper S supplied from the paper feed unit 3 in the first direction. That is, the paper transport direction in the transport unit 7 is the first direction. The transport unit 7 transports the paper S supplied from the paper feed unit 3 so as to sequentially pass through the plurality of second image forming units 4C, 4M, 4Y and the first image forming unit 6. The transport unit 7 is located above the paper feed tray 31. The transport unit 7 includes a drive roller 71, a driven roller 72, and a transport belt 73.

The drive roller 71 is configured to drive the transport belt 73. The drive roller 71 is configured to orbit the transport belt 73. The drive rollers 71 are spaced apart from each other on the downstream side of the driven rollers 72 in the first direction. The drive roller 71 is rotatable about a rotation axis extending in the second direction. The second direction intersects the first direction. The second direction is preferably orthogonal to the first direction.

The driven roller 72 is configured to orbit the transport belt 73 together with the drive roller 71. The driven roller 72 is rotatable about a rotation axis extending in the second direction. The driven roller 72 rotates according to the transport belt 73 that is circulated by the drive roller 71.

The transport belt 73 is an endless belt. The transport belt 73 is hung on the drive roller 71 and the driven roller 72. The transport belt 73 extends in the first direction while being hung on the drive roller 71 and the driven roller 72. The transport belt 73 orbits around the drive roller 71 and the driven roller 72.

1.4 First image forming unit The first image forming unit 6 transfers the first toner onto the paper S to form the first toner image. In the transport direction (first direction) of the paper S, the first image forming portion 6 is arranged on the downstream side of the plurality of second image forming portions 4Y, 4M, and 4C. The first image forming portion 6 and the plurality of second image forming portions 4Y, 4M, and 4C are arranged at intervals from each other in the first direction. The first image forming unit 6 includes a first photosensitive drum 61, a first charger 64, a first developing roller 62, a first toner accommodating unit 63, and a first transfer roller 65.

The first photosensitive drum 61 is rotatable about a rotation axis extending in the second direction. The first photosensitive drum 61 extends in the second direction. The first photosensitive drum 61 is located above the transport unit 7. The first photosensitive drum 61 comes into contact with the outer surface of the transport belt 73.

The first charger 64 is configured to charge the peripheral surface of the first photosensitive drum 61. A charging bias for charging the first photosensitive drum 61 is applied to the first charging device 64. The first charger 64 is located at a distance from the peripheral surface of the first photosensitive drum 61.

The first developing roller 62 is configured to supply the first toner to the peripheral surface of the first photosensitive drum 61. A first bias is applied to the first developing roller 62 to supply the first toner to the first photosensitive drum 61. The first developing roller 62 extends in the second direction. The first developing roller 62 comes into contact with the peripheral surface of the first photosensitive drum 61.

The first toner accommodating unit 63 can accommodate the first toner supplied to the first developing roller 62. The first toner accommodating portion 63 is located on the opposite side of the first photosensitive drum 61 with respect to the first developing roller 62.

The first transfer roller 65 is configured to transfer the first toner image from the peripheral surface of the first photosensitive drum 61 onto the paper S. A transfer bias for transferring the first toner image onto the paper S is applied to the first transfer roller 65. The first transfer roller 65 extends in the second direction. The first transfer roller 65 is located below the first photosensitive drum 61. The first transfer roller 65 is located in the transport belt 73. The first transfer roller 65 and the first photosensitive drum 61 sandwich the transport belt 73 in the vertical direction.

1.5 The plurality of second image forming portions The plurality of second image forming portions 4Y, 4M, and 4C each supply the second toner on the paper S to form the second toner image. In the transport direction (first direction) of the paper S, the plurality of second image forming portions 4Y, 4M, and 4C are located on the upstream side of the first image forming portion 6. Each of the plurality of second image forming portions 4Y, 4M, and 4C has the same structure except for the toner accommodated in the toner accommodating portion. Each of the plurality of second image forming portions 4Y, 4M, and 4C has a second photosensitive drum 41, a second charger 44, a second developing roller 42, a second toner accommodating portion 43, and a second transfer roller 45. And.

The second photosensitive drum 41 is rotatable about a rotation axis extending in the second direction. The second photosensitive drum 41 extends in the second direction. The second photosensitive drum 41 is located above the transport unit 7. The second photosensitive drum 41 comes into contact with the outer surface of the transport belt 73.

The second charger 44 is configured to charge the peripheral surface of the second photosensitive drum 41. A charging bias for charging the second photosensitive drum 41 is applied to the second charging device 44. The second charger 44 is located at a distance from the peripheral surface of the second photosensitive drum 41.

The second developing roller 42 is configured to supply the second toner to the peripheral surface of the second photosensitive drum 41. The second developing roller 42 has the same polarity as the first bias, and a second bias for supplying toner to the second photosensitive drum 41 is applied. The second developing roller 42 extends in the second direction. The second developing roller 42 comes into contact with the peripheral surface of the second photosensitive drum 41.

The second toner accommodating unit 43 can accommodate the second toner supplied to the second developing roller 42. The second toner accommodating portion 43 is located on the opposite side of the second photosensitive drum 41 with respect to the second developing roller 42.

The second transfer roller 45 is configured to transfer the second toner image from the peripheral surface of the second photosensitive drum 41 onto the paper S. A transfer bias for transferring the second toner image onto the paper S is applied to the second transfer roller 45. The second transfer roller 45 extends in the second direction. The second transfer roller 45 is located below the second photosensitive drum 41. The second transfer roller 45 is located in the transport belt 73. The second transfer roller 45 and the second photosensitive drum 41 sandwich the transport belt 73 in the vertical direction.

1.6 Exposure device The exposure device 5 is configured to expose the first photosensitive drum 61 and the plurality of second photosensitive drums 41. The exposure apparatus 5 is located above the first image forming unit 6 and the plurality of second image forming units 4Y, 4M, and 4C. Explaining the first photosensitive drum 61, the exposure apparatus 5 exposes the peripheral surface of the first photosensitive drum 61 charged by the first charger 64. As a result, an electrostatic latent image is formed on the peripheral surface of the first photosensitive drum 61. After that, the first toner is supplied to the electrostatic latent image by the first developing roller 62, so that the first toner image is formed on the peripheral surface of the first photosensitive drum 61. Similarly, a second toner is supplied to the peripheral surface of the second photosensitive drum 41 to form a second toner image.

1.7 Fixer The fuser 8 is configured to fix the toner image on the paper S by heating and pressurizing the paper S on which the toner image is transferred. The fuser 8 is located at intervals on the downstream side of the first image forming unit 6 in the transport direction (first direction) of the paper S. The fuser 8 includes a heating roller 81 and a pressure roller 82. The heating roller 81 is configured to be heatable. The pressure roller 82 comes into contact with the heating roller 81.

1.8 Foil transfer unit The foil transfer unit 100 is configured to superimpose a metal foil on the first toner image and heat the first toner image and the metal foil to transfer the metal foil to the first toner image. Will be done. The foil transfer unit 100 is located on the downstream side of the fixing device 8 in the transport direction of the paper S. The foil transfer unit 100 includes a first reel 120, a second reel 130, a first foil transfer roller 140, and a second foil transfer roller 150.

The first reel 120 is wound with a foil film F before being transferred to the first toner image. The foil film F includes a carrier film F1 and a metal foil F2 laminated on the carrier film F1. In the foil film F wound on the first reel 120, the metal foil F2 is located on the opposite side of the first reel 120 with respect to the carrier film F1 on which the metal foil is laminated.

The second reel 130 is configured to wind up the carrier film F1 after the metal foil F2 is transferred to the first toner image. The second reel 130 is located on the downstream side of the first reel 120 at intervals in the transport direction of the paper S.

The first foil transfer roller 140 and the second foil transfer roller 150 form a foil film F on the first toner image formed on the paper S passing between the first foil transfer roller 140 and the second foil transfer roller 150. The metal leaf F2 of the above is configured to be overlapped. The first foil transfer roller 140 and the second foil transfer roller 150 are located between the first reel 120 and the second reel 130 in the transport direction of the paper S. The foil film F from the first reel 120 to the second reel 130 is hung on the first foil transfer roller 140. The first foil transfer roller 140 is configured to heat the stacked first toner image and the metal foil. The first foil transfer roller 140 is configured to be heatable. The first foil transfer roller 140 and the second foil transfer roller 150 sandwich the foil film F. The first foil transfer roller 140 comes into contact with the carrier film F1 in the foil film F. The second foil transfer roller 150 comes into contact with the metal foil F2 in the foil film F.

1.9 Sensor unit The sensor unit 9 is configured to detect the passage of the paper S in the image forming apparatus 1. The sensor unit 9 includes a paper feed sensor 91, a fixing sensor 92, and an discharge sensor 93.

The paper feed sensor 91 is configured to detect the passage of the paper S supplied from the paper feed unit 3 to the transport unit 7.

The fixing sensor 92 is configured to detect the passage of the paper S from the fixing device 8 toward the foil transfer unit 100. The fixing sensor 92 is located between the fixing device 8 and the foil transfer unit 100 in the transport direction of the paper S.

The discharge sensor 93 is configured to detect the passage of the paper S from the foil transfer unit 100 toward the discharge port 22 of the main body housing 2. The discharge sensor 93 is located between the foil transfer unit 100 and the discharge port 22 in the transport direction of the paper S.

Each of the paper feed sensor 91, the fixing sensor 92, and the discharge sensor 93 conveys the paper S from the non-detection position (see the virtual line in FIG. 1) that can contact the passing paper S and the non-detection position due to the contact with the paper S. It can rotate between the detection position (see the solid line in FIG. 1) that falls toward the downstream side in the direction. Each of the paper feed sensor 91, the fixing sensor 92, and the discharge sensor 93 is electrically connected to the control unit 10. Each of the paper feed sensor 91, the fixing sensor 92, and the discharge sensor 93 transmits a detection signal to the control unit 10 when it is positioned at the detection position. Each of the paper feed sensor 91, the fixing sensor 92, and the discharge sensor 93 stops transmitting the detection signal to the control unit 10 when they are positioned at the non-detection position.

1.10 Control unit The control unit 10 controls the foil transfer process as an example of the first process and the normal print process as an example of the second process in a switchable manner. In the foil transfer treatment, at least the first toner image of the first toner image and the second toner image is formed on the paper S, and the metal foil is transferred to the first toner image. In the normal printing process, at least one of the first toner image and the second toner image is formed on the paper S, and the metal foil is not transferred to the first toner image.

Although not shown, the control unit 10 includes a CPU, a ROM, a RAM, an NVRAM, and an integrated circuit (ASIC) for a specific application.

The ROM stores various programs executed by the CPU, for example, a foil transfer processing program for foil transfer processing, a normal print processing program for normal print processing, and the like. Further, the ROM stores the fixing temperature of the fixing device 8 and the foil transfer temperature of the foil transfer unit 100 in each of the foil transfer process and the normal printing process.

The NVRAM stores, for example, a reference value of the bias applied to the developing roller in the normal printing process.

The ASIC is configured to control the operation of the image forming apparatus 1 by executing various programs of the CPU.

2. Details of the foil film The foil film F is wound on the first reel 120. As described above, the foil film F includes a carrier film F1 and a metal foil F2 laminated on the carrier film F1.

A peeling treatment layer (not shown) is preferably provided on the surface of the carrier film F1 on which the metal foil F2 is laminated. Examples of the material of the carrier film F1 include a resin material and the like.

The metal foil F2 is laminated on the side opposite to the carrier film F1 with respect to the peeling treatment layer. For example, the metal foil F2 is laminated on the carrier film F1 by metal vapor deposition. The metal leaf F2 contains at least one metal atom suitable for metal deposition, for example, selected from the group consisting of Al, Zn, Ni, Au, Ag, Pt and Cr. Considering the cost, preferably, the metal foil F2 contains an Al atom or a Cr atom.

The metal foil F2 contains, for example, the metal containing the above-mentioned metal atom as a main component. Considering ease of handling, the metal foil F2 is more preferably composed of at least one Al-containing metal selected from the group consisting of _{Al alone, Al 2} O _{3, Al—Si alloy and Al—Cu alloy.} .. When the metal foil F2 contains the above-mentioned metal atoms, it is possible to stably improve the adhesive force between the first toner image and the metal foil F2. The thickness of the metal foil F2 is, for example, 0.002 μm or more and 0.08 μm or less.

The metal leaf F2 can also contain a colorant. Since the metal leaf F2 contains a colorant, the color of the metal leaf F2 can be changed.

3. 3. Details of the First Toner The first toner is stored in the first toner accommodating portion 63. The first toner contains at least a binder resin and an adhesive for adhering the paper S and the metal foil F2.

The binder resin contains a polymer of vinyl monomers. Preferably, the binder resin consists of a polymer of vinyl monomers.

Examples of vinyl monomers include aromatic vinyl monomers (eg, styrene, vinyltoluene, α-methylstyrene, etc.), (meth) acrylic acid, derivatives of (meth) acrylic acid (eg, methyl (meth) acrylic acid, (meth). ) Ethyl acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, isobonyl (meth) acrylate, dimethylaminoethyl (meth) acrylate , (Meta) acrylamide, etc.), olefin monomers (eg, ethylene, propylene, butylene, etc.) and the like. The vinyl monomer can be used alone or in combination of two or more.

Among the vinyl monomers, a combination of a derivative of styrene and (meth) acrylic acid is preferable. That is, the binder resin of the first toner is preferably a styrene acrylic resin.

The adhesive is a functional group-containing vinyl monomer containing a tertiary amino group, a tertiary amino group salt, or a quaternary ammonium salt, and a vinyl monomer copolymerizable with the functional group-containing vinyl monomer (hereinafter, copolymerizable vinyl monomer). It contains at least the copolymer of). Preferably, the adhesive comprises a functional group-containing vinyl monomer and a copolymer of a vinyl monomer copolymerizable with the functional group-containing vinyl monomer.

Examples of the functional group-containing vinyl monomer containing a salt of a tertiary amino group include paratoluenesulfonate of dimethylaminoethyl methacrylate. Examples of the functional group-containing vinyl monomer containing a quaternary ammonium salt include a methyl chloride salt of dimethylaminopropyl acrylamide, a chloride salt of N, N, N-trimethyl-N- (2-methacryloxyethyl) ammonium, and N-benzyl. Examples thereof include a chloride salt of −N, N-dimethyl-N- (2-methacryloxyethyl) ammonium. The functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt can be used alone or in combination of two or more.

Among the functional group-containing vinyl monomers containing a tertiary amino group salt or a quaternary ammonium salt, preferred examples include paratoluenesulfonate of dimethylaminoethyl methacrylate and methyl chloride salt of dimethylaminopropylacrylamide. That is, when the functional group-containing vinyl monomer contains a tertiary amino group salt or a quaternary ammonium salt, it preferably contains a paratoluenesulfonate of dimethylaminoethyl methacrylate or a methyl chloride salt of dimethylaminopropylacrylamide. When a functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt contains a paratoluene sulfonate of dimethylaminoethyl methacrylate or a methyl chloride salt of dimethylaminopropylacrylamide, a metal foil and a first toner are used. It is possible to surely improve the adhesive force with the image.

Examples of the functional group-containing vinyl monomer containing a tertiary amino group include dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dimethylaminomethyl (meth) acrylate, diethylaminomethyl (meth) acrylate, and dipropylaminomethyl. Examples thereof include (meth) acrylate, diisopropylaminomethyl (meth) acrylate, ethylmethylaminomethyl (meth) acrylate, methylpropylaminomethyl (meth) acrylate, and dipropylamino-1-ethyl (meth) acrylate. The functional group-containing vinyl monomer containing a tertiary amino group can be used alone or in combination of two or more.

Among the functional group-containing vinyl monomers containing a tertiary amino group, dimethylaminoethyl methacrylate and diethylaminoethyl methacrylate are preferably mentioned. That is, when the functional group-containing vinyl monomer contains a tertiary amino group, it preferably contains dimethylaminoethyl methacrylate or diethylaminoethyl methacrylate. When the functional group-containing vinyl monomer containing a tertiary amino group contains dimethylaminoethyl methacrylate or diethylaminoethyl methacrylate, it is possible to surely improve the adhesive force between the metal foil and the first toner image.

The functional group-containing vinyl monomer is either a functional group-containing vinyl monomer containing a tertiary amino group, a functional group-containing vinyl monomer containing a tertiary amino group salt, or a functional group-containing vinyl monomer containing a quaternary ammonium salt. Only one type may be contained, or a plurality of types may be contained. The functional group-containing vinyl monomer is preferably a functional group-containing vinyl monomer containing a tertiary amino group, a functional group-containing vinyl monomer containing a tertiary amino group salt, and a functional group-containing vinyl monomer containing a quaternary ammonium salt. Contains only one of the above.

Examples of the copolymerizable vinyl monomer include the above-mentioned vinyl monomer. The copolymerizable vinyl monomer can be used alone or in combination of two or more.

Among the copolymerizable vinyl monomers, a combination of a derivative of styrene and (meth) acrylic acid is preferable. The copolymerizable vinyl monomer is preferably the same as the vinyl monomer of the binder resin. That is, the vinyl monomer copolymerizable with the functional group-containing vinyl monomer is preferably styrene. Further, the vinyl monomer copolymerizable with the functional group-containing vinyl monomer preferably contains a derivative of (meth) acrylic acid.

When a functional group-containing vinyl monomer containing a salt or a quaternary ammonium salt of the tertiary amino groups, for the first toner, the content of salts or quaternary ammonium salts of tertiary amino groups in the adhesive, It is 0.28% by mass or more, preferably 0.35% by mass or more, 20.0% by mass or less, preferably 10% by mass or less, and more preferably 5.0% by mass or less.

When the functional group-containing vinyl monomer contains a tertiary amino group, the content ratio of the tertiary amino group in the adhesive to the first toner is 2.65% by mass or more, preferably 4.00% by mass. % Or more, more preferably 5.10% by mass or more, 20.0% by mass or less, preferably 10.0% by mass or less. The content ratio of the tertiary amino group , the tertiary amino group salt or the quaternary ammonium salt can be measured according to the method described in Examples. The content ratio of the tertiary amino group , the tertiary amino group salt or the quaternary ammonium salt can also be calculated from the charged amount of the functional group-containing vinyl monomer.

When the content ratio of the tertiary amino group , the tertiary amino group salt or the quaternary ammonium salt is in the above range, the metal leaf can be stably adhered to the first toner image.

In addition, the first toner preferably contains wax. If the first toner contains wax, it is possible to improve the releasability at the time of heat fixing.

Examples of the wax include polyolefin wax, vegetable wax, petroleum wax and the like. The wax can be used alone or in combination of two or more. That is, when the first toner contains a wax, the wax is at least one wax selected from the group consisting of polyolefin waxes, plant waxes and petroleum waxes. The wax preferably consists of one type of wax.

Examples of the polyolefin wax include polyethylene wax, polypropylene wax, polybutylene wax and the like. Among the polyolefin waxes, polyethylene wax is preferable.

When the first toner contains polyethylene wax, the content ratio of polyethylene wax to the first toner is, for example, 0.1% by mass or more, for example, 10% by mass or less, preferably 6.00% by mass or less. is there.

When the adhesive contains a copolymer of a functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt and a copolymerizable vinyl monomer, and the first toner contains polyethylene wax (that is,). , When the first toner contains a binder resin, an adhesive, and polyethylene wax), the lower limit of the content ratio of the tertiary amino group salt or the quaternary ammonium salt in the adhesive to the first toner. Decreases from the above range.

Specifically, when the first toner contains a binder resin, an adhesive, and polyethylene wax, the salt of the tertiary amino group in the adhesive or the quaternary ammonium is added to the first toner. The salt content is 0.20% by mass or more, preferably 0.25% by mass or more, more preferably 0.28% by mass or more and 20.0% by mass or less, preferably 10% by mass or less, and further. Preferably, it is 5.0% by mass or less.

When the content ratio of the tertiary amino group salt or the quaternary ammonium salt is in the above range, the metal leaf can be stably adhered to the first toner image.

When the adhesive contains a functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt and a copolymer of a copolymerizable vinyl monomer, and the first toner contains polyethylene wax. The content ratio of the tertiary amino group salt or the quaternary ammonium salt in the adhesive to the polyethylene wax is 0.045 or more, preferably 0.051 or more, more preferably 0.055 or more, for example, 0.1. It is as follows.

When the adhesive contains a copolymer of a functional group-containing vinyl monomer containing a tertiary amino group and a copolymerizable vinyl monomer, and the first toner contains a polyethylene wax, the tertiary in the adhesive to the polyethylene wax The content ratio of the amino group is, for example, 0.80 or more, preferably 1.10 or more, more preferably 1.50 or more, for example, 20 or less.

If the content ratio of the tertiary amino group, the tertiary amino group salt or the quaternary ammonium salt in the adhesive to the polyethylene wax is within the above range, the metal leaf can be stably adhered by the first toner image. it can.

Examples of the plant wax include candelilla wax, carnauba wax, rice wax, wood wax, jojoba wax and the like. Among the plant waxes, carnauba wax is preferable.

When the first toner contains carnauba wax, the content ratio of carnauba wax to the first toner is, for example, 0.1% by mass or more, preferably 1.0% by mass or more, and more preferably 2.0. It is mass% or more, for example, 20 mass% or less, preferably 6.5 mass% or less.

If the adhesive contains a copolymer of a functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt and a copolymerizable vinyl monomer, and the first toner contains carnauba wax, carnauba wax The content ratio of the tertiary amino group salt or the quaternary ammonium salt to the adhesive is, for example, 0.180 or more, preferably 0.21 or more, for example, 0.5 or less.

When the adhesive contains a functional group-containing vinyl monomer containing a tertiary amino group and a copolymer of a copolymerizable vinyl monomer, and the first toner contains carnauba wax, the third grade in the adhesive to carnauba wax The content ratio of the amino group is, for example, 1.00 or more, for example, 50 or less, preferably 40 or less, and more preferably 3.0 or less.

If the content ratio of the tertiary amino group, the tertiary amino group salt or the quaternary ammonium salt in the adhesive to the carnauba wax is within the above range, the metal leaf can be stably adhered by the first toner image. it can.

Examples of petroleum-based waxes include paraffin wax, microcrystalline wax, and petroleum lactam wax. Among the petroleum-based waxes, paraffin wax is preferable.

When the first toner contains paraffin wax, the content ratio of paraffin wax to the first toner is, for example, 2.0% by mass or more, for example, 25% by mass or less, preferably 15.0% by mass or less. is there.

If the adhesive contains a copolymer of a functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt and a copolymerizable vinyl monomer, and the first toner contains paraffin wax, paraffin wax The content ratio of the tertiary amino group salt or the quaternary ammonium salt in the adhesive is, for example, 0.020 or more, preferably 0.15 or more, for example, 0.50 or less.

When the adhesive contains a functional group-containing vinyl monomer containing a tertiary amino group and a copolymer of a copolymerizable vinyl monomer, and the first toner contains a paraffin wax, the third grade in the adhesive to the paraffin wax The content ratio of the amino group is, for example, 0.20 or more, preferably 0.40 or more, for example, 3.00 or less.

If the content ratio of the tertiary amino group, the tertiary amino group salt or the quaternary ammonium salt in the adhesive to the paraffin wax is within the above range, the metal leaf can be stably adhered by the first toner image. it can.

Such a first toner contains, as an adhesive, a copolymer of a functional group-containing vinyl monomer and a copolymerizable vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt, and a tertiary amino group. It may contain both a functional group-containing vinyl monomer and a copolymer of a copolymerizable vinyl monomer.

The first toner, when having a salt or a quaternary ammonium salt of the tertiary amino groups, salts or quaternary ammonium salts of tertiary amino groups because it provides a positive charge, usually a positively chargeable toner.

In addition, the first toner can further contain a charge control agent. Examples of the charge control agent include a positive charge control agent and a negative charge control agent.

Examples of the positive charge control agent include a charge control resin containing a quaternary ammonium salt such as a styrene acrylic resin containing a quaternary ammonium salt and a polyester resin containing a quaternary ammonium salt, and a niglosin dye. For example, "Bontron N-01", "Bontron N-04", "Bontron N-07" (manufactured by Orient Chemical Co., Ltd.), "CHUO CCA-1", "CHUO CCA-3" (manufactured by Chuo Synthetic Co., Ltd.), Examples thereof include "TP-415" (manufactured by Hodogaya Chemical Co., Ltd.). The charge control resin and the niglosin dye containing the quaternary ammonium salt can be used alone or in combination of two or more.

A functional group-containing vinyl monomer and a copolymerizable vinyl monomer in which the first toner contains a charge control resin containing a tertiary amino group salt or a quaternary ammonium salt, and the adhesive contains a tertiary amino group. When composed of a copolymer, the content ratio of the tertiary amino group salt or the quaternary ammonium salt in the first toner is, for example, 6.0 × 10 ^-5 % by mass or more and less than 0.28% by mass, preferably. , Less than 0.20% by mass. Therefore, such a charge control resin is not included in the adhesive of the present invention.

As a result, even when the adhesive is composed of a functional group-containing vinyl monomer containing a tertiary amino group and a copolymer of a copolymerizable vinyl monomer, the first toner can be a positively charged toner. .. The content ratio of the positive charge control agent to the first toner is, for example, 1.0% by mass or more and 3.0% by mass or less.

As the negative charge control agent, for example, a commercially available negative charge control agent can be used. When the first toner contains a negative charge control agent, the first toner can be a negative charge toner. The content ratio of the negative charge control agent to the first toner is, for example, 0.10% by mass or more and 1.0% by mass or less.

Further, the first toner can contain a known additive such as a colorant and a filler in an appropriate ratio.

Such a first toner can be prepared, for example, by the method described in Japanese Patent No. 5673901. For example, an adhesive is prepared by polymerizing a functional group-containing vinyl monomer containing a tertiary amino group, a tertiary amino group salt or a quaternary ammonium salt with a copolymerizable vinyl monomer. Next, the adhesive and the vinyl monomer used for the binder resin are mixed, and then the vinyl monomer is polymerized to prepare the first toner.

Further, the first toner may be a polymerized toner prepared by a polymerization method, or may be a pulverized toner prepared by a pulverization method. The first toner is preferably a polymerized toner.

When the toner contains an external agent containing a tertiary amino group , a tertiary amino group salt or a quaternary ammonium salt as a charge control agent, the salt of the tertiary amino group and the tertiary amino group with respect to the toner. Alternatively, if the content ratio of the quaternary ammonium salt is within the range of the present invention, the external additive is included in the adhesive of the present invention regardless of the name.

4. Details of the Second Toner The second toner is stored in the second toner accommodating portion 43. The second toner contains at least a binder resin and a charge control resin.

Examples of the binder resin of the second toner include the same binder resin as the first toner. As the binder resin of the second toner, styrene acrylic resin is preferable. That is, the binder resin of the first toner and the binder resin of the second toner are preferably styrene acrylic resins.

The charge control resin contains at least a copolymer of a functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt and a copolymerizable vinyl monomer.

Examples of the functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt include the above-mentioned functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt. The functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt can be used alone or in combination of two or more.

The content ratio of the tertiary amino group salt or the quaternary ammonium salt in the charge control resin with respect to the second toner ^{is 6.0 × 10 -5} % by mass or more and less than 0.28% by mass, preferably 0. It is less than 20% by mass.

When the content ratio of the tertiary amino group salt or the quaternary ammonium salt to the second toner is in the above range, it is possible to prevent the metal leaf from adhering to the second toner image. Therefore, the metal leaf can be selectively adhered only to the first toner image. As a result, on the same paper S, a first toner image to which the metal foil is transferred and a second toner image to which the metal foil is not transferred can be formed. The second toner does not contain a tertiary amino group. Alternatively, when the second toner contains a tertiary amino group, the content ratio of the tertiary amino group in the second toner is less than 2.65% by mass.

The second toner is usually a positively charged toner because the salt of the tertiary amino group or the quaternary ammonium salt provides positive chargeability. Further, the second toner may further contain the above-mentioned negative charge control agent to be a negative charge toner. Further, the second toner can contain the above-mentioned known additives such as wax, colorant and filler in an appropriate ratio.

Such a second toner can be prepared, for example, by the method described in Japanese Patent No. 5673901. That is, the second toner can be prepared by the same method as that of the first toner. Further, the second toner may be a polymerized toner or a pulverized toner. The second toner is preferably a polymerized toner. The charge control resin contained in the second toner is not included in the adhesive of the present invention because the content ratio of the quaternary ammonium salt to the second toner is within the above range.

5. Image forming operation Next, the image forming process in the image forming apparatus 1 will be described with reference to FIGS. 2 to 5.

As shown in FIG. 2, the control unit 10 executes an image forming program when receiving a print command. In the present embodiment, it is assumed that the control unit 10 receives print data for printing on a plurality of sheets (N sheets) of paper S. In the following description, the downstream end of the paper S in the transport direction is defined as the front end, and the upstream end of the paper S in the transport direction is defined as the rear end.

In the image forming process, the control unit 10 determines whether or not the print data includes the print data of the metal foil (S1).

When the print data includes the print data of the metal foil (S1: Yes), the control unit 10 executes the selective foil transfer program (S2). On the other hand, when the print data does not include the print data of the metal foil (S1: No), the control unit 10 executes the normal print program (S3).

5.1 Selective foil transfer process The selective foil transfer process will be described with reference to FIG.

In the selective foil transfer process, the control unit 10 sets the transport speed of the paper S to the first speed (S4).

The first speed is, for example, 4 mm / sec or more, preferably 5 mm / sec or more, for example, 100 mm / sec or less, preferably 75 mm / sec or less.

Next, the control unit 10 sets a first bias (unit: V) applied to the first developing roller 62 and a second bias (unit: V) applied to the plurality of second developing rollers 42 (S5). ..

The first bias and the second bias have the same polarity. The absolute value of the first bias is larger than the absolute value of the second bias. That is, the control unit 10 controls so that the absolute value of the first bias becomes larger than the absolute value of the second bias in the selective foil transfer process. When the absolute value of the first bias is larger than the absolute value of the second bias, the amount of the first toner per unit area supplied to the first photosensitive drum 61 is calculated per unit area supplied to the second photosensitive drum 41. It can be larger than the amount of the second toner. As a result, the amount of the first toner per unit area with respect to the paper S becomes larger than the amount of the second toner per unit area with respect to the paper S. That is, in the selective foil transfer process, the control unit 10 controls so that the amount of the first toner per unit area with respect to the paper S is larger than the amount of the second toner per unit area with respect to the paper S. As a result, the first toner image and the metal foil can be more reliably adhered to each other.

Specifically, the CPU first reads the bias reference value from the NVRAM and writes it to the RAM. Then, the CPU calculates the first bias and the second bias by adding or subtracting a predetermined value to the reference value of the bias so that the absolute value of the first bias becomes larger than the absolute value of the second bias. After that, the CPU writes the first bias and the second bias to the RAM.

The absolute value of the first bias is, for example, 270 V or more, preferably 300 V or more, for example, 550 V or less, preferably 500 V or less. The absolute value of the second bias is, for example, 250 V or more, preferably 270 V or more, for example, 450 V or less, preferably 400 V or less. The difference between the absolute value of the first bias and the absolute value of the second bias is, for example, 10 V or more, preferably 50 V or more, for example, 200 V or less, preferably 150 V or less.

Next, the control unit 10 sets the heating temperature (fixing temperature) of the heating roller 81 and the heating temperature (foil transfer temperature) of the first foil transfer roller 140 (S6).

The foil transfer temperature is lower than the fixing temperature. As a result, the temperature at which the metal foil is peeled from the foil film can be made relatively low.

The fixing temperature is, for example, 150 ° C. or higher, preferably 160 ° C. or higher, for example, 210 ° C. or lower, preferably 200 ° C. or lower. The foil transfer temperature is, for example, 100 ° C. or higher, preferably 110 ° C. or higher, for example, 210 ° C. or lower, preferably 200 ° C. or lower. The difference between the fixing temperature and the foil transfer temperature is, for example, 10 ° C. or higher, preferably 40 ° C. or higher, for example, 120 ° C. or lower, preferably 100 ° C. or lower.

Next, the control unit 10 energizes the fixing device 8 and the foil transfer unit 100 so that the heating roller 81 and the first foil transfer roller 140 are heated (S7).

Next, the control unit 10 determines whether or not the heating roller 81 has reached the fixing temperature and the first foil transfer roller 140 has reached the foil transfer temperature (S8). When the heating roller 81 has not reached the fixing temperature and / or the first foil transfer roller 140 has reached the foil transfer temperature (S8: No), the control unit 10 repeats the step.

When the heating roller 81 reaches the fixing temperature and the first foil transfer roller 140 reaches the foil transfer temperature (S8: Yes), the control unit 10 causes the paper feed unit 3 to feed one sheet of paper S. (S9).

Specifically, the control unit 10 energizes the paper feed unit 3 and the transfer unit 7 so that the transfer speed of the paper S becomes the first speed. As a result, the paper S is fed from the paper feed tray 31.

Next, the control unit 10 executes the print control process (S10).

The print control process will be described with reference to FIGS. 1 and 4.

In the print control process, the control unit 10 applies a charging bias to the first charging device 64 and the plurality of second charging devices 44, and applies a transfer bias to the first transfer roller 65 and the plurality of second transfer rollers 45. (S11). As a result, the peripheral surface of the first photosensitive drum 61 and the peripheral surfaces of the plurality of second photosensitive drums 41 are charged.

Next, the control unit 10 determines whether or not the tip of the paper S has passed through the paper feed sensor 91 (S12). Specifically, the control unit 10 determines whether or not the detection signal has been received from the paper feed sensor 91. When the detection signal is not received from the paper feed sensor 91 (S12: No), the control unit 10 repeats the step.

When the detection signal is received from the paper feed sensor 91 (S12: Yes), the control unit 10 causes the exposure device 5 to expose the first photosensitive drum 61 and the plurality of second photosensitive drums 41 based on the print data (S13). ). As a result, an electrostatic latent image is formed on each of the peripheral surface of the first photosensitive drum 61 and the peripheral surface of the plurality of second photosensitive drums 41.

Next, the control unit 10 applies the first bias to the first developing roller 62 and applies the second bias to the plurality of second developing rollers 42 (S14).

Specifically, the CPU applies the first bias to the first developing roller 62 and applies the second bias to the plurality of second developing rollers 42 with reference to the first bias and the second bias of the RAM. Further, the CPU rotationally drives the first developing roller 62 and the plurality of second developing rollers 42.

As a result, the first developing roller 62 supplies the first toner to the electrostatic latent image of the first photosensitive drum 61. That is, the first toner is electrically transferred from the first developing roller 62 to the electrostatic latent image of the first photosensitive drum 61, and the first toner image is formed on the peripheral surface of the first photosensitive drum 61. Further, the second developing roller 42 supplies the second toner to the electrostatic latent image of the second photosensitive drum 41. That is, the second toner is electrically transferred from the second developing roller 42 to the electrostatic latent image of the second photosensitive drum 41, and the second toner image is formed on the peripheral surface of the second photosensitive drum 41.

Next, the second photosensitive drum 41 and the second transfer roller 45 transfer the second toner image from the second photosensitive drum 41 when the paper S passes between the second photosensitive drum 41 and the second transfer roller 45. Transfer to paper S. After that, the first photosensitive drum 61 and the first transfer roller 65 transfer the first toner image from the first photosensitive drum 61 when the paper S passes between the first photosensitive drum 61 and the first transfer roller 65. The second toner image is transferred to the formed paper S.

After that, the fixing device 8 heats and pressurizes the paper S when the paper S on which the first toner image and the second toner image are formed passes between the heating roller 81 and the pressure roller 82. As a result, the first toner image and the second toner image are heat-fixed to the paper S.

Subsequently, the foil transfer unit 100 superimposes the metal foil F2 on the paper S on which the first toner image and the second toner image are formed, and heats the first toner image and the metal foil F2 to heat the first toner image and the metal leaf F2. The metal leaf F2 is transferred to the toner image.

Specifically, the foil transfer unit 100 determines that the sheet S on which the first toner image and the second toner image are fixed passes between the first foil transfer roller 140 and the second foil transfer roller 150. The foil film F is superposed on the paper S so that the metal foil F2 comes into contact with the printing surface, and the first toner image and the metal foil F2 are heated. As a result, the metal foil F2 is peeled off from the carrier film F1 and transferred to the first toner image without being transferred to the second toner image.

Further, as shown in FIG. 3, after applying the first bias and the second bias (see S14 and FIG. 4), the control unit 10 determines whether or not there is print data on the next page (S15).

When there is print data on the next page (S15: Yes), the control unit 10 determines whether or not the first time has elapsed since the rear end of the preceding paper S passed through the paper feed sensor 91 (S15: Yes). S16). Specifically, the control unit 10 determines whether or not the first time has elapsed since the detection signal from the paper feed sensor 91 was stopped. If the first time has not elapsed (S16: No), the control unit 10 repeats the step. When the first time has elapsed (S16: Yes), the control unit 10 again feeds one sheet of paper S (S9).

On the other hand, when there is no print data on the next page (S15: No), the control unit 10 determines whether or not the rear end of the preceding paper S has passed the fixing sensor 92 (S17). Specifically, the control unit 10 determines whether or not the detection signal from the fixing sensor 92 has stopped after receiving the detection signal from the fixing sensor 92. When the rear end of the paper S has not passed through the fixing sensor 92 (S17: No), the control unit 10 repeats the step.

When the rear end of the paper S passes through the fixing sensor 92 (S17: Yes), the control unit 10 moves to the first image forming unit 6, the plurality of second image forming units 4Y, 4M, 4C, and the fixing device 8. (S18). As a result, the application of the charging bias, the transfer bias, the first bias and the second bias, and the heating of the heating roller 81 are stopped.

Next, the control unit 10 determines whether or not the rear end of the preceding paper S has passed the discharge sensor 93 (S19). Specifically, the control unit 10 determines whether or not the detection signal from the discharge sensor 93 has stopped after receiving the detection signal from the discharge sensor 93. When the rear end of the paper S has not passed through the discharge sensor 93 (S19: No), the control unit 10 repeats the step.

When the rear end of the paper S passes through the discharge sensor 93 (S19: Yes), the control unit 10 stops the energization of the foil transfer unit 100 (S20). As a result, the heating of the first foil transfer roller 140 is stopped.

With the above, the selective foil transfer process is completed.

5.2 Normal printing process As shown in FIG. 2, when the print data does not include the metal leaf data (S1: No), the normal print process is executed (S3).

The normal printing process will be described with reference to FIG.

In the normal printing process, the control unit 10 sets the conveying speed of the paper S to the second speed (S21).

The second speed is faster than the first speed. That is, the control unit 10 controls so that the transport speed (first speed) of the paper S in the selective foil transfer process is slower than the transport speed (second speed) of the paper S in the normal printing process. As a result, the heating time of the fixing device 8 in the selective foil transfer treatment can be made longer than the heating time of the fixing device 8 in the normal printing process. Therefore, in the selective foil transfer treatment, the surface of the first toner image fixed on the paper S can be made smoother than in the normal printing treatment. As a result, the adhesiveness of the metal foil to the first toner image can be further improved.

The second speed is, for example, 80 mm / sec or more, preferably 100 mm / sec or more.

Next, the control unit 10 determines whether or not the print data includes color print data (S22).

When the print data does not include color print data (S22: No), the control unit 10 separates the plurality of second developing rollers 42 from the corresponding second photosensitive drum 41 by a contact / detachment mechanism (not shown) (S23). ). Next, the control unit 10 sets a third bias to be applied to the first developing roller 62 (S24).

When the print data includes color print data (S22: Yes), the control unit 10 sets a third bias (unit: V) to be applied to the first development roller 62 and the plurality of second development rollers 42. (S25). The method of setting the third bias is the same as the method of setting the first bias and the second bias described above.

The third bias, the first bias, and the second bias have the same polarity. The absolute value of the third bias is smaller than the absolute value of the first bias. The absolute value of the third bias may be smaller or larger than the absolute value of the second bias. Further, the absolute value of the third bias and the absolute value of the second bias may be the same. The range of the absolute value of the third bias is the same as the range of the absolute value of the second bias described above.

Next, the control unit 10 sets the heating temperature (fixing temperature) of the heating roller 81 (S26).

The fixing temperature in the normal printing process is higher than the foil transfer temperature and lower than the fixing temperature in the selective foil transfer process.

The fixing temperature in the normal printing process is, for example, 150 ° C. or higher, preferably 160 ° C. or higher, for example, 210 ° C. or lower, preferably 200 ° C. or lower. The difference between the fixing temperature in the selective foil transfer treatment and the fixing temperature in the normal printing treatment is, for example, 10 ° C. or higher, preferably 40 ° C. or higher, for example, 120 ° C. or lower, preferably 100 ° C. or lower.

Next, the control unit 10 energizes the fuser 8 so that the heating roller 81 is heated (S27). The foil transfer unit 100 is not energized, and the first foil transfer roller 140 is not heated.

Next, the control unit 10 determines whether or not the heating roller 81 has reached the fixing temperature (S28).

When the heating roller 81 has not reached the fixing temperature (S28: No), the control unit 10 repeats the step.

When the heating roller 81 reaches the fixing temperature (S28: Yes), the control unit 10 feeds one sheet of paper S (S29). Specifically, the control unit 10 energizes the paper feed unit 3 and the transfer unit 7 so that the transfer speed of the paper S becomes the second speed. As a result, the paper S is fed from the paper feed tray 31.

Next, the control unit 10 executes the same print control process as described above (see S30, FIG. 4). As a result, at least one of the first toner image and the second toner image is formed on the paper S. The metal foil is not transferred to the first toner image.

Next, the control unit 10 determines whether or not there is print data for the next page (S31).

When there is print data on the next page (S31: Yes), the control unit 10 determines whether or not a second time has elapsed since the rear end of the preceding paper S passed through the paper feed sensor 91 (S31: Yes). S32). The second hour is shorter than the first hour.

If the second time has not elapsed (S32: No), the control unit 10 repeats the step. When the second time has elapsed (S32: Yes), the control unit 10 again feeds one sheet of paper S (S29).

On the other hand, when there is no print data on the next page (S31: No), the control unit 10 determines whether or not the rear end of the preceding paper S has passed the fixing sensor 92 (S33). When the rear end of the paper S has not passed through the fixing sensor 92 (S33: No), the control unit 10 repeats the step.

When the rear end of the paper S passes through the fixing sensor 92 (S33: Yes), the control unit 10 moves to the first image forming unit 6, the plurality of second image forming units 4Y, 4M, 4C, and the fixing device 8. (S34).

With the above, the normal printing process is completed.

6. Action Effect As shown in FIG. 1, the image forming apparatus 1 includes a first image forming section 6 and a foil transfer section 100. The first image forming unit 6 transfers the first toner onto the paper S to form the first toner image. The foil transfer unit 100 superimposes the metal foil F2 on the first toner image, and heats the first toner image and the metal foil F2 to transfer the metal foil F2 to the first toner image.

The first toner contains a functional group-containing vinyl monomer containing a tertiary amino group or a quaternary ammonium salt and a copolymer of a copolymerizable vinyl monomer. The content ratio of the quaternary ammonium salt or the tertiary amino group in the first toner is in the above range.

Therefore, the adhesive strength between the metal foil and the first toner image can be improved, and the adhesive stability of the metal foil with respect to the first toner image can be improved.

[Second Embodiment]
Next, the image forming apparatus 11 of the second embodiment will be described with reference to FIG. In the image forming apparatus 11, the same members as those of the image forming apparatus 1 are designated by the same reference numerals, and the description thereof will be omitted.

The number of second image forming portions is not particularly limited. The image forming apparatus 11 includes a first image forming unit 6 and a plurality of second image forming units 4K, 4Y, 4M, and 4C.

The image forming apparatus 11 includes a plurality of exposure apparatus 51 instead of the exposure apparatus 5. Each of the plurality of exposure devices 51 is located above the first photosensitive drum 61 or the second photosensitive drum 41.

In the image forming apparatus 11, in the selective foil transfer process described above, each of the plurality of second image forming portions 4K, 4Y, 4M, and 4C forms a second toner image on the paper S. After that, the first image forming unit 6 forms the first toner image on the paper S on which the second toner image is formed. Then, the foil transfer unit 100 transfers the metal foil to the first toner image as in the first embodiment.

Even with such a second embodiment, the same effects as those of the first embodiment can be obtained.

[Third Embodiment]
Next, the image forming apparatus 12 of the third embodiment will be described with reference to FIG. 7. In the image forming apparatus 12, the same members as those of the image forming apparatus 1 are designated by the same reference numerals, and the description thereof will be omitted.

The image forming apparatus 12 further includes a transport path 90 and a foil transfer unit 200 that can be attached to the main body housing 2.

The transport path 90 is provided in the main body housing 2. The transport path 90 includes a paper discharge path 90A, a unit guide path 90B, a re-transport path 90C, and a flapper 95.

The paper ejection path 90A is a path for guiding the paper S sent out from the fixing device 8 to the ejection port 22.

The unit guide path 90B is a path that guides the paper S sent from the paper discharge path 90A to the unit-side paper feed path 160 (described later) outside the main body housing 2. The unit guide path 90B branches from the paper discharge path 90A and extends to the end of the main body housing 2.

The re-conveyance path 90C is a path for re-transporting the paper S that has passed through the foil transfer unit 200 to the paper feed unit 3. The re-conveyance path 90C extends horizontally between the paper feed tray 31 and the transport unit 7.

The flapper 95 is provided at a branch portion between the paper ejection path 90A and the unit guide path 90B. The flapper 95 closes the paper ejection path 90A and closes the first position (see the solid line in FIG. 7) for guiding the paper S toward the foil transfer unit 200, and closes the unit guide path 90B to guide the paper S to the ejection port 22. It is possible to switch to the second position (see the virtual line in FIG. 7) that guides the user.

The foil transfer unit 200 is attached to the outer surface of the main body housing 2 so as to be aligned horizontally with the main body housing 2. The foil transfer unit 200 includes a foil transfer unit 100, a unit-side paper feed path 160, and a unit-side paper discharge path 170. That is, the foil transfer unit 100 is located outside the main body housing 2.

The unit-side paper feed path 160 is a path that guides the paper S sent from the unit guide path 90B to the foil transfer unit 100. The unit-side paper feed path 160 is connected to the unit guide path 90B.

The unit-side paper ejection path 170 is a path that guides the paper S that has passed through the foil transfer unit 100 to the re-conveyance path 90C. The unit-side paper discharge path 170 is connected to the re-conveyance path 90C.

In the image forming apparatus 12, the flapper 95 located at the first position guides the paper S on which the first toner image and the second toner image are formed from the paper ejection path 90A in the above-mentioned selective foil transfer process. Guide to route 90B. Then, the unit guide path 90B guides the paper S toward the unit-side paper feed path 160.

Next, the unit-side paper feed path 160 guides the paper S toward the foil transfer unit 100. Then, the foil transfer unit 100 transfers the metal foil to the first toner image formed on the paper S, as in the first embodiment. After that, the unit-side output path 170 guides the paper S that has passed through the foil transfer section 100 to the re-conveyance path 90C.

Next, the re-conveyance path 90C re-conveys the paper S to the paper feed unit 3. After that, the paper feeding unit 3 and the conveying unit 7 convey the paper S so as to sequentially pass through the plurality of second image forming units 4C, 4M, 4C, the first image forming unit 6, and the fixing device 8.

Further, the flapper 95 swings from the first position to the second position to close the unit guide path 90B and open the paper ejection path 90A. Then, the paper ejection path 90A guides the paper S toward the ejection port 22. After that, the discharge port 22 discharges the paper S.

Further, in the above-mentioned normal printing process, the flapper 95 located at the second position transfers the paper S on which at least one of the first toner image and the second toner image is formed to the foil transfer unit 200 (foil transfer). It guides the paper discharge path 90A without passing through the part 100).

Even with such a third embodiment, the same effects as those of the first embodiment can be obtained.

[Fourth Embodiment]
Next, the image forming apparatus 13 of the fourth embodiment will be described with reference to FIG. In the image forming apparatus 13, the same members as those of the image forming apparatus 12 are designated by the same reference numerals, and the description thereof will be omitted.

The image forming apparatus 13 includes a transport path 90 and a foil transfer unit 200 that can be attached to the main body housing 2. The foil transfer unit 200 is attached to the outer surface of the main body housing 2 so as to be vertically aligned with the main body housing 2.

The transport path 90 includes a paper discharge path 90A, a unit guide path 90B, and a flapper 95, and does not include a re-transport path 90C. The foil transfer unit 200 includes a foil transfer unit 100, a unit-side paper feed path 160, and a unit-side paper discharge path 180.

The unit-side paper ejection path 180 is a path for guiding the paper S that has passed through the foil transfer unit 100 to the ejection port 202 of the foil transfer unit 200. The unit-side paper discharge path 180 is connected to the discharge port 202.

In the image forming apparatus 13, the flapper 95 located at the first position guides the paper S on which the first toner image and the second toner image are formed from the paper ejection path 90A in the above-mentioned selective foil transfer process. Guide to route 90B.

Then, the unit guide path 90B guides the paper S toward the unit-side paper feed path 160. Next, the unit-side paper feed path 160 guides the paper S toward the foil transfer unit 100. Subsequently, the foil transfer unit 100 transfers the metal foil to the first toner image formed on the paper S, as in the first embodiment. After that, the unit-side output path 180 guides the paper S that has passed through the foil transfer unit 100 to the output port 202. The discharge port 202 discharges the paper S.

Further, in the above-mentioned normal printing process, the flapper 95 located at the second position transfers the paper S on which at least one of the first toner image and the second toner image is formed to the foil transfer unit 200 (foil transfer). The guide is directed toward the discharge port 22 without passing through the part 100).

Even with such a fourth embodiment, the same effects as those of the first embodiment can be obtained.

[Fifth Embodiment]
Next, the image forming apparatus 14 of the fifth embodiment will be described with reference to FIG. In the image forming apparatus 14, the same members as those of the image forming apparatus 1 are designated by the same reference numerals, and the description thereof will be omitted.

The image forming apparatus 14 is an intermediate transfer type color printer. The image forming apparatus 14 includes a transfer unit 70, a first image forming unit 6, a plurality of second image forming units 4Y, 4M, 4C, and a foil transfer unit 100.

The transfer unit 70 is configured to transfer the first toner image and / or the second toner image transferred to the intermediate transfer belt 75 from the intermediate transfer belt 75 to the paper S. The transfer unit 70 includes a drive roller 77, a driven roller 78, an intermediate transfer belt 75, and a secondary transfer roller 76.

The drive roller 77 is configured to orbit the intermediate transfer belt 75. The driven roller 78 is configured to orbit the intermediate transfer belt 75 together with the driving roller 77. The driven roller 78 is positioned at a distance from the driving roller 77 in the horizontal direction. The driven roller 78 rotates according to the intermediate transfer belt 75 that is rotated by the driving roller 77.

The intermediate transfer belt 75 is an endless belt. The intermediate transfer belt 75 is hung on the drive roller 77 and the driven roller 78. The intermediate transfer belt 75 extends in the horizontal direction while being hung on the driving roller 77 and the driven roller 78. The intermediate transfer belt 75 orbits around the drive roller 77 and the driven roller 78.

The secondary transfer roller 76 transfers the first toner image and the second toner image from the intermediate transfer belt 75 to the paper S. The secondary transfer roller 76 comes into contact with the outer surface of the intermediate transfer belt 75. An intermediate transfer belt 75 is sandwiched between the secondary transfer roller 76 and the driven roller 78.

The first image forming unit 6 transfers the first toner onto the intermediate transfer belt 75 to form the first toner image. The first photosensitive drum 61 is located below the transfer unit 70. The first photosensitive drum 61 comes into contact with the intermediate transfer belt 75. The first transfer roller 65 is configured to transfer the first toner image from the peripheral surface of the first photosensitive drum 61 onto the intermediate transfer belt 75. The first transfer roller 65 is located in the intermediate transfer belt 75. The first transfer roller 65 and the first photosensitive drum 61 sandwich an intermediate transfer belt 75 in the vertical direction.

The plurality of second image forming units 4Y, 4M, and 4C each transfer the second toner onto the intermediate transfer belt 75 to form the second toner image. The second photosensitive drum 41 is located below the transfer unit 70. The second photosensitive drum 41 comes into contact with the outer surface of the intermediate transfer belt 75. The second transfer roller 45 is configured to transfer the second toner image from the peripheral surface of the second photosensitive drum 41 onto the intermediate transfer belt 75. The second transfer roller 45 is located in the intermediate transfer belt 75. The second transfer roller 45 and the second photosensitive drum 41 sandwich the intermediate transfer belt 75 in the vertical direction.

In the image forming apparatus 14, in the selective foil transfer process described above, each of the plurality of second image forming portions 4Y, 4M, and 4C forms a second toner image on the intermediate transfer belt 75. After that, the first image forming unit 6 forms the first toner image on the intermediate transfer belt 75 on which the second toner image is formed. Then, when the paper S passes between the secondary transfer roller 76 and the driven roller 78, the secondary transfer roller 76 transfers the first toner image and the second toner image from the intermediate transfer belt 75 to the paper S. Transcribe. After that, the fixing device 8 heat-fixes the first toner image and the second toner image on the paper S. Next, the foil transfer unit 100 superimposes the metal foil on the paper S on which the first toner image and the second toner image are formed, and heats the first toner image and the metal foil, as in the first embodiment. This transfers the metal leaf to the first toner image.

Even with such a fifth embodiment, the same effects as those of the first embodiment can be obtained.

[Sixth Embodiment]
Next, the image forming apparatus 15 of the sixth embodiment will be described with reference to FIG. In the image forming apparatus 15, the same members as those of the image forming apparatus 14 are designated by the same reference numerals, and the description thereof will be omitted. The image forming apparatus 15 includes a first image forming unit 6 and a plurality of second image forming units 4K, 4Y, 4M, and 4C. Even with such a sixth embodiment, the same effects as those of the first embodiment can be obtained.

[7th Embodiment]
Next, the foil transfer device 16 of the seventh embodiment will be described with reference to FIG. In the foil transfer device 16, the same members as those of the image forming device 1 are designated by the same reference numerals, and the description thereof will be omitted.

The foil transfer device 16 includes a main body housing 2, a first image forming unit 6, an exposure device 5, a fixing device 8, and a foil transfer unit 100, and does not include a second image forming unit. The main body housing 2 has a paper feed opening 25.

In the foil transfer device 16, the paper S is supplied to the first image forming unit 6 through the paper feed opening 25. Then, the first image forming unit 6 forms the first toner image on the paper S as in the first embodiment. After that, the fixing device 8 heat-fixes the first toner image to the paper S. Next, the foil transfer unit 100 transfers the metal foil to the first toner image in the same manner as in the first embodiment. Even with such a seventh embodiment, the same effects as those of the first embodiment can be obtained.

[Modification example]
In the first to seventh embodiments, the fixing device 8 heat-fixes the first toner image and the second toner image on the paper S, but the present invention is not limited to this. The foil transfer unit 100 may heat-fix the first toner image and the second toner image to the paper S, and transfer the metal foil to the first toner image. Also by this, the same action and effect as in the first embodiment can be obtained.

Examples and comparative examples are shown below, and the present invention will be described in more detail. The present invention is not limited thereto. In addition, specific numerical values such as the compounding ratio (content ratio), physical property values, and parameters used in the following description are described in the above-mentioned "Form for carrying out the invention", and the compounding ratios corresponding to them ( Substitute for the upper limit (numerical value defined as "less than or equal to" or "less than") or lower limit (numerical value defined as "greater than or equal to" or "excess") such as content ratio), physical property value, parameter, etc. it can. In addition, "part" and "%" are based on mass unless otherwise specified.

In addition, the methods for measuring various physical properties described below are shown below.
< Measurement of content ratio of tertiary amino group salt, quaternary ammonium salt or tertiary amino group (flow potential measurement)>
Prepare 100 parts by mass of a toner suspension in which toner is suspended in water. The toner content in the toner suspension is 0.1% by mass.

Next, an aqueous solution of sodium dodecyl sulfate having a concentration of 0.004 mol / L was added dropwise to the toner suspension, and a flow potential measuring device (Automatic Potentiometric Titrator AT-510 and Particle Charge Detector PCD-500: manufactured by Kyoto Denshi Kogyo Co., Ltd.) was added. Measures the flow potential of the toner suspension. Then, the pole of change of the flow potential of the toner suspension is set as the titration point.

The amount of positive group (content ratio of tertiary amino group salt, quaternary ammonium salt or tertiary amino group) in the toner suspension is calculated from the amount of sodium dodecyl sulfate aqueous solution dropped up to the titration point. Then, the content ratio of the tertiary amino group salt, the quaternary ammonium salt or the tertiary amino group in the toner is calculated from the positive electrode group amount in the toner suspension.
<Surface potential measurement>
Place the toner on a wooden desk (surface potential 0 kV). Then, the surface potential of the toner is measured by an electrostatic measuring instrument (YC-102) every hour for a total of three times. After that, the average value of the three measured values is taken as the surface potential.

(Production Example 1: Preparation of Adhesive A)
85 parts by mass of styrene, 11 parts by mass of butyl acrylate, and 4 parts by mass of paratoluenesulfonate of dimethylaminoethyl methacrylate were dispersed by a bead mill to obtain a monomer mixture. The monomer mixture was then added to a mixed solvent of 500 parts by weight of toluene and 400 parts by weight of methanol and at 80 ° C. for 8 hours in the presence of 4 parts by weight of 2,2'-azobis (2,4-dimethylvaleronitrile). It was reacted. After completion of the reaction, the solvent was distilled off to obtain an adhesive A containing a salt of a tertiary amino group.

(Production Example 2: Preparation of Adhesive B)
80 parts by mass of styrene and 20 parts by mass of dimethylaminoethyl methacrylate were dispersed with a bead mill to obtain a monomer mixture. The monomer mixture was then added to 900% by weight of toluene and reacted at 80 ° C. for 8 hours in the presence of 4 parts by weight of 2,2'-azobis (2,4-dimethylvaleronitrile). After completion of the reaction, the solvent was distilled off to obtain an adhesive B containing a tertiary amino group.

(Production Example 3: Preparation of Adhesive C)
Adhesive C containing a quaternary ammonium salt was obtained in the same manner as in Production Example 1 except that the paratoluenesulfonate of dimethylaminoethyl methacrylate was changed to a methyl chloride salt of dimethylaminopropyl acrylamide.

(Production Example 4: Preparation of Adhesive D)
Adhesive D containing a tertiary amino group was obtained in the same manner as in Production Example 2 except that dimethylaminoethyl methacrylate was changed to diethylaminoethyl methacrylate.

(Examples 1 to 5 and Comparative Example 1)
Adhesive A containing styrene, butyl acrylate, and a salt of a tertiary amino group, and a colorant (carbon black: CB), the content ratio of the salt of the tertiary amino group in the toner is the value shown in Table 1. The monomer composition was prepared by mixing so as to be.

Further, 56.2 parts of a sodium hydroxide aqueous solution (concentration: 11.0% by mass) was added to 260.2 parts of a magnesium chloride aqueous solution (concentration: 3.92% by mass) with stirring to add magnesium hydroxide colloid. Generated. As a result, an aqueous dispersion medium was prepared.

Then, the monomer composition was added to the aqueous dispersion medium and stirred. Then, 4.4 parts of the polymerization initiator (t-butylperoxydiethylbutanoate) was added to the aqueous dispersion medium, and the mixture was stirred with a disperser at a rotation speed of 15,000 rpm for 10 minutes with high shearing in the aqueous dispersion medium. The droplets of the monomer composition were dispersed in the mixture. As a result, an aqueous dispersion of the monomer composition was prepared.

Next, the aqueous dispersion of the monomer composition was heated to 90 ° C. and subjected to a polymerization reaction. As a result, an aqueous dispersion of toner particles (polymer) was prepared.

Next, the pH of the aqueous dispersion of the toner particles was adjusted to 4 or less with sulfuric acid while stirring the aqueous dispersion of the toner particles. Then, the toner particles were separated from water by filtration, washed with water a plurality of times, and then dried in a dryer (50 ° C.) for 24 hours to prepare the toner. The toner contained a styrene acrylic resin as a binder resin, an adhesive A, and a colorant.

(Examples 6 to 13 and Comparative Example 2)
The toner was prepared in the same manner as in Example 1 except that the polyethylene wax was further mixed with the monomer composition so that the content ratio of the polyethylene wax in the toner was as shown in Table 2.

(Examples 14 to 16 and Comparative Example 3)
The toner was prepared in the same manner as in Example 1 except that the carnauba wax was further mixed with the monomer composition so that the content ratio of the carnauba wax in the toner was the value shown in Table 3.

(Examples 17 to 23 and Comparative Example 4)
The toner was prepared in the same manner as in Example 1 except that the paraffin wax was further mixed with the monomer composition so that the content ratio of the paraffin wax in the toner was the value shown in Table 4.

(Examples 24 to 30 and Comparative Example 5)
The same as in Example 1 except that the negative charge control agent (manufactured by Fujikura Kasei Co., Ltd.) was further mixed with the monomer composition so that the content ratio of the negative charge control agent in the toner became the value shown in Table 5. Toner was prepared. The surface potential of the toner is shown in Table 5.

(Examples 31 to 34 and Comparative Example 6)
Adhesive A is changed to adhesive B containing a tertiary amino group, and styrene, butyl acrylate, adhesive B, and a colorant (carbon black: CB) are used as a tertiary amino group in the toner. Toners were prepared in the same manner as in Example 1 except that the monomer composition was prepared by mixing so that the content ratio of the above was as shown in Table 6.

(Examples 35-39)
The monomer composition of each of the polyethylene wax and the positive charge control agent (Bontron N-7, manufactured by Orient Chemical Co., Ltd.) is such that the content ratios of the polyethylene wax and the positive charge control agent in the toner are as shown in Table 7. Toners were prepared in the same manner as in Example 31 except that they were further mixed with the product.

(Examples 40 to 43)
Examples except that each of the carnauba wax and the positive charge control agent was further mixed with the monomer composition so that the content ratios of the carnauba wax and the positive charge control agent in the toner were the values shown in Table 8. Toner was prepared in the same manner as in 31.

(Examples 44 to 50)
Examples except that each of the paraffin wax and the positive charge control agent was further mixed with the monomer composition so that the content ratios of the paraffin wax and the positive charge control agent in the toner were the values shown in Table 9. Toner was prepared in the same manner as in 31.

(Example 51 and Comparative Example 7)
The same as in Example 31 except that the negative charge control agent (manufactured by Fujikura Kasei Co., Ltd.) was further mixed with the monomer composition so that the content ratio of the negative charge control agent in the toner became the value shown in Table 10. Toner was prepared.

<Evaluation of foil transferability>
The toners obtained in each of the examples and the comparative examples were housed in the first toner accommodating portion of the image forming apparatus shown in FIG. Then, the above-mentioned selective foil transfer treatment was executed. The heating temperature (setting) of the first foil transfer roller was 150 ° C. The surface temperature of the paper passing between the first foil transfer roller and the second foil transfer roller was 120 ° C. The main component of the metal foil was Al alone.

The foil transferability was evaluated according to the following criteria.
◯: 95% or more of the metal foil was transferred to the first toner image.
Δ: The metal foil was transferred to the first toner image by 50% or more and less than 95%.
X: Less than 50% of the metal foil was transferred to the first toner image.

(Examples 52 to 81)
Toners were prepared in the same manner as in Examples 1 to 30, except that the adhesive A was changed to the adhesive C. The results of the foil transferability evaluation of the toners of Examples 52 to 81 were the same as the results of the foil transferability evaluation of the toners of Examples 1 to 30 (see Tables 1 to 5 above).

(Examples 82 to 102)
Toners were prepared in the same manner as in Examples 31 to 51, except that the adhesive B was changed to the adhesive D. The results of the foil transferability evaluation of the toners of Examples 82 to 102 were the same as the results of the foil transferability evaluation of the toners of Examples 31 to 51 (see Tables 6 to 10 above).

In the above embodiment, the toner contains carbon black as a colorant, but the colorant is not limited to this, and may be other colorants such as cyan, magenta, and yellow. Further, the toner does not have to contain a colorant, and for example, the colorant may be replaced with a styrene acrylic resin.

1 Image forming device 4 Second image forming unit 6 First image forming unit 10 Control unit 11 Image forming device 12 Image forming device 13 Image forming device 14 Image forming device 15 Image forming device 16 Foil transfer device 41 Second photosensitive drum 42 No. 2 Development roller 61 1st photosensitive drum 62 1st development roller 75 Intermediate transfer belt 76 Secondary transfer roller 100 Foil transfer section

Claims (12)

A first image forming portion that transfers the first toner onto paper to form a first toner image, and a first image forming portion.
A foil transfer portion for overlaying a metal foil on the first toner image and transferring the metal foil to the first toner image by heating the first toner image and the metal foil is provided.
The first toner contains at least a binder resin and an adhesive for adhering the paper and the metal foil.
The adhesive contains at least a functional group-containing vinyl monomer containing a tertiary amino group , a tertiary amino group salt or a quaternary ammonium salt, and a copolymer of a vinyl monomer copolymerizable with the functional group-containing vinyl monomer. And
When the functional group-containing vinyl monomer contains a tertiary amino group salt or a quaternary ammonium salt, the first toner contains the tertiary amino group salt or the quaternary ammonium salt in the adhesive. The ratio is 0.28% by mass or more and 20.0% by mass or less.
When the functional group-containing vinyl monomer contains a tertiary amino group, the content ratio of the tertiary amino group in the adhesive to the first toner is 2.65% by mass or more and 20.0% by mass. A foil transfer device characterized by the following. The functional group-containing vinyl monomer is
When containing a salt of a tertiary amino group, it contains a paratoluene sulfonate of dimethylaminoethyl methacrylate.
When containing quaternary ammonium salts include methyl chloride salt of di methyl amino propyl acrylamide,
The foil transfer device according to claim 1, wherein when it contains a tertiary amino group, it contains dimethylaminoethyl methacrylate or diethylaminoethyl methacrylate. The foil transfer apparatus according to claim 1 or 2, wherein the vinyl monomer copolymerizable with the functional group-containing vinyl monomer is styrene. The first toner further contains wax and
The foil transfer apparatus according to any one of claims 1 to 3, wherein the wax is at least one wax selected from the group consisting of polyolefin wax, vegetable wax and petroleum wax. .. A second image forming portion for supplying the second toner on the paper to form the second toner image is further provided.
The second toner contains at least a binder resin and a charge control resin.
The charge control resin contains at least a functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt and a copolymer of a vinyl monomer copolymerizable with the functional group-containing vinyl monomer.
The content ratio of the tertiary amino group salt or the quaternary ammonium salt in the charge control resin with respect to the second toner ^{is 6.0 × 10 -5} % by mass or more and less than 0.28% by mass.
The foil transfer unit superimposes the metal foil on the paper on which the first toner image and the second toner image are formed, and heats the first toner image and the metal foil to heat the first toner image and the metal foil. The foil transfer device according to any one of claims 1 to 4, wherein the metal foil is transferred to a toner image. A first process of forming at least the first toner image of the first toner image and the second toner image on paper and transferring the metal foil to the first toner image, and the first process. A control unit is provided which controls at least one of the toner image and the second toner image on paper so as to be switchable between a second process in which the metal foil is not transferred to the first toner image.
The foil transfer device according to claim 5, wherein the control unit controls the paper transport speed in the first process to be slower than the paper transport speed in the second process. A first process of forming at least the first toner image of the first toner image and the second toner image on paper and transferring the metal leaf to the first toner image, and the first process. A control unit is provided which controls at least one of the toner image and the second toner image on paper so as to be switchable between a second process in which the metal foil is not transferred to the first toner image.
The control unit is characterized in that, in the first process, the amount of the first toner per unit area with respect to the paper is controlled to be larger than the amount of the second toner per unit area with respect to the paper. The foil transfer device according to claim 5 or 6. The first image forming part is
With the first photosensitive drum
A first developing roller to which a first bias for supplying toner to the first photosensitive drum is applied, and
With
The second image forming part is
With the second photosensitive drum
A second developing roller having the same polarity as the first bias and to which a second bias for supplying toner to the second photosensitive drum is applied.
With
The foil transfer device according to claim 7, wherein the control unit controls the absolute value of the first bias to be larger than the absolute value of the second bias in the first process. The foil transfer according to any one of claims 5 to 8, wherein the first image forming portion is arranged on the downstream side of the second image forming portion in the paper transport direction. apparatus. The foil transfer device according to any one of claims 5 to 9, wherein the binder resin of the first toner and the binder resin of the second toner are styrene acrylic resins. A first image forming portion that transfers the first toner onto paper to form a first toner image, and a first image forming portion.
A foil transfer portion for overlaying a metal foil on the first toner image and transferring the metal foil to the first toner image by heating the first toner image and the metal foil is provided.
The first toner contains at least a binder resin, an adhesive for adhering the paper and the metal foil, and polyethylene wax.
The adhesive contains a functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt, and a copolymer of a vinyl monomer copolymerizable with the functional group-containing vinyl monomer.
The content ratio of the tertiary amino group salt or the quaternary ammonium salt in the adhesive to the first toner is 0.20% by mass or more and 20.0% by mass or less.
A foil transfer device, wherein the content ratio of the tertiary amino group salt or the quaternary ammonium salt in the adhesive to the polyethylene wax is 0.045 or more. With the intermediate transfer belt,
A first image forming portion that transfers the first toner onto the intermediate transfer belt to form a first toner image, and a first image forming portion.
A second image forming portion that transfers the second toner onto the intermediate transfer belt to form a second toner image, and a second image forming portion.
A secondary transfer roller that transfers the first toner and the second toner image from the intermediate transfer belt to paper, and
A metal foil is superposed on the paper on which the first toner image and the second toner image are formed, and the metal foil is formed on the first toner image by heating the first toner image and the metal foil. Equipped with a foil transfer part to transfer
The first toner contains at least a functional group-containing vinyl monomer containing a tertiary amino group salt or a quaternary ammonium salt and a copolymer of a vinyl monomer copolymerizable with the functional group-containing vinyl monomer.
When the functional group-containing vinyl monomer contains a tertiary amino group salt or a quaternary ammonium salt, the first toner contains the tertiary amino group salt or the quaternary ammonium salt in the adhesive. ratio is equal to or less than 0.28 mass% to 20.0 mass%, the foil transfer apparatus.

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