JP4430139B2 - Method for producing endless printing belt for rotary stamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endless printing belt using a porous body used for a rotation mark of a built-in ink type.
[0002]
[Prior art]
Rotary stamp made of an endless printing belt using a porous material to the printing section having an open cell disclosed in JP-A-54-103127 and real HirakiAkira 54-118210 etc., the ink can be built to itself, using In this case, the ink can be continuously stamped without attaching ink, which is very useful. Conventionally, spongy rubber is mainly used for the porous body of such an endless printing belt, and a cotton cloth is mainly used as a base material for complementing the strength of the rubber. Almost no changes were made to other substances such as thermoplastics.
This is presumably because thermoplastic substances such as polyethylene and polypropylene have a very poor adhesion to cotton cloth, and therefore, when used for the endless printing belt, there is a problem that cannot be put into practical use.
In addition, conventional endless printing belts with rotational signs generally use a method of simultaneously molding printed portions such as characters, figures, symbols, and patterns when molding an endless printing belt. Is a sculpture of the pedestal (mount) and the printing part in two steps.
However, in this method, required characters, figures, patterns and the like have to be engraved in the mold in advance, and it has not been possible to form the endless print belt by adding characters and the like.
[0003]
[Problems to be solved by the invention]
Therefore, the present invention was invented for the purpose of selecting the most excellent base material when a thermoplastic material is used for the porous body of the endless printing belt. It is another object of the present invention to provide an endless print belt capable of forming a belt.
[0004]
[Means for Solving the Problems]
Non-printing with a non-porous protective coating on the pedestal in an endless printing belt for rotating stamps, which is made of a hot melt sheet that does not shrink due to heat, and a base made of a thermoplastic porous body is molded on the hot melt sheet An endless printing belt with a part formed. In addition, in the endless printing belt for rotary stamps, which is obtained by forming a base made of a thermoplastic porous body on the hot melt sheet, the base material is a hot melt sheet that does not shrink due to heat on a reinforcing material, An endless printing belt in which a non-printing portion is formed on a pedestal by a non-porous protective coating.
A sheet formed into a plate shape after kneading by adding at least a water-soluble foam forming agent to a thermoplastic substance is heated to 100 ° C. to 200 ° C., and the heated sheet is set in a mold engraving only a pedestal, A base material made of a hot melt sheet that does not shrink due to heat on it , or a base material that is placed on a hot melt sheet that does not shrink due to heat on a reinforcing material , is further molded with a pressing plate, and then released. washed out post the water-soluble foaming agent, a non-print portion formed by a non-porous protective coating on the pedestal after drying, fused by overlapping ends of the sheet obtained by cutting this the The manufacturing method of the endless printing belt for rotation signs of description . Also, at least a water-soluble foam forming agent is added to the thermoplastic material and kneaded and the sheet formed into a plate shape is heated to 100 ° C. to 200 ° C., and the heated sheet is set in a mold engraving only the base. Then, a base material made of a hot melt sheet that does not shrink by heat or a base material that has a hot melt sheet that does not shrink by heat on top of the reinforcing material is placed on the substrate , and then molded by placing a push plate on it. The above-described rotation obtained by washing out the water-soluble bubble-forming agent after molding, drying and then fusing the two ends of the sheet in a superimposed manner to form a non-printing portion with a non-porous protective coating on the pedestal A manufacturing method of an endless printing belt for printing.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
The present invention relates to an endless printing belt for a rotary stamp formed by using a hot melt sheet as a base material and molding a base made of a thermoplastic porous body on the hot melt sheet, and non-printing with a non-porous protective coating on the base This is an endless printing belt formed with a portion.
As the base material used in the present invention, a hot melt sheet made of a thermoplastic resin that melts at 50 ° C. to 180 ° C. can be used. As the material, for example, polyethylene, polypropylene, vinyl chloride and the like can be used, and in particular, polyethylene is preferably used. As the hot melt sheet of the present invention, a hot melt sheet that does not shrink due to heat formed into a sheet without applying stretchability is used in order to prevent defects during molding of an endless print belt. The hot melt sheet of the present invention can be either a non-porous material or a porous material. When a non-porous sheet is used, ink cannot be supplied from the back side of the endless printing belt, so the ink is supplied from the surface of the printing unit. When a porous sheet is used, the endless printing belt Ink can be supplied from the back side or from the surface of the printing unit.
From the viewpoints of moldability, adhesiveness, and ink permeability, a particularly preferred substrate in the present invention has a lattice network structure having a basis weight of 10 to 30 g / m ² , a thickness of 0.05 to 0.50 mm, and a distance between mesh holes of 1 to 2 mm. It is a polyethylene hot melt sheet.
A thermoplastic porous body is used for the base of the present invention. As a material, a thermoplastic resin that melts mainly at 50 ° C. to 180 ° C. is used. For example, polyethylene, polypropylene, vinyl chloride, and the like can be used, and in particular, polyethylene is preferably used. In the present invention, in order to obtain a porous body having open cells, after molding a kneaded material obtained by adding at least a water-soluble cell forming agent such as sodium chloride or calcium chloride to a thermoplastic resin, the water-soluble cell forming agent is added. Wash out and make it porous. When producing the porous body, in addition to the water-soluble bubble forming agent, a heating material fine powder that absorbs infrared rays and generates heat, such as carbon black, may be added and kneaded. In order to obtain a porous body, there is a method in which a foaming agent is mixed with a thermoplastic resin to form open cells, but this is not preferable because it is difficult to obtain continuous cells having a uniform size.
In the present invention, a mold is used that engraves only the pedestal and does not engrave the printed portion of characters, symbols, figures, patterns, and the like. Therefore, only the base is formed on the molded sheet, and no printing part is formed.
[0006]
Therefore, in order to form the printing portion on the pedestal, a positive film in which the required characters are black and the margins are expressed in a transparent background, or a negative film in which the required characters are transparent and the margins are expressed in a black background is provided on the pedestal. Overlay, irradiate infrared rays from the film side, melt and solidify the part corresponding to the margin to form a non-printing part with a non-porous protective coating that does not allow ink to bleed out, and ink bleed the part corresponding to characters etc. It remains in a printable state to form a printing portion. In this case, if the thermoplastic porous material contains a heat generating material fine powder that absorbs infrared rays and generates heat, use a positive film.If the thermoplastic porous material does not contain a heat generating material fine powder, use a negative film to write characters, etc. Form. This method of creating characters by infrared irradiation is already known in Japanese Patent Publication No. 53-43321, Japanese Patent Application Laid-Open No. 6-155698, Japanese Patent Application Laid-Open No. 8-72376, Japanese Patent Application No. 8-272200, and the like.
As another method for forming a printing portion, an endless printing belt without a printing portion is incorporated into a conventionally known rotational stamp, and then a die engraved with necessary characters is heated to about 80 ° C. While rotating the endless printing belt, the rotation mark is moved, the portion corresponding to the margin other than characters etc. is melted and solidified to form a non-printing portion with a non-porous protective coating that prevents ink from spreading, and the characters There is also a method of forming a printing portion by leaving a portion corresponding to the above so as to allow ink bleeding.
In any case, if an endless printing belt having only a pedestal on which characters or the like are not formed is manufactured at the beginning, an endless printing belt on which a necessary number of characters or the like are formed can be obtained later when necessary. Therefore, it is not necessary to keep an inventory of useless finished products.
[0007]
The endless belt of the present invention is manufactured as follows.
Add a water-soluble foaming agent such as sodium chloride or calcium chloride to a thermoplastic material such as polyethylene, and if necessary, add a heat-generating fine powder such as carbon black, knead and form a sheet into a plate shape Heat to 100 ° C to 200 ° C, set the heated sheet in a mold engraved with only the pedestal, place the substrate on it, mold with a push plate, release the mold, and then release the water After washing out and drying the porous foam-forming agent, a non-printing portion with a non-porous protective coating is formed on the pedestal by the above method, and both ends of the sheet are overlapped and heat-sealed by a heat sealing machine. The sheet is manufactured after being dried, or both ends of the sheet are overlapped and heat-sealed by a heat sealing machine, and after cutting to the required width, the non-porous material is protected on the pedestal by the above method. Non-printing part by coating Formed to manufacture.
In the present invention, as described above, a print belt is manufactured by heating a sheet that is formed into a plate shape by adding a water-soluble bubble forming agent. Therefore, if the mold is not heated at all or kept at a low temperature, it is not necessary to heat the mold to a high temperature, so there is no need for a high temperature control device for the mold, and the manufacturing apparatus can be simplified. In addition, anything such as a phenol plate having a melting point of 200 ° C. or higher can be used without any particular limitation. The reason why the sheet formed into a plate shape by adding the water-soluble bubble forming agent is heated to 100 ° C. to 200 ° C. is to soften the sheet as much as possible to improve the moldability. Here, although it seems that the said sheet | seat has added the water-soluble bubble formation agent, even if it heats to 160 degreeC, it does not melt | dissolve. The heating method may be a method of placing on a hot plate or heating with a microwave, and is not particularly limited as long as it is a method of heating the entire sheet.
In this manufacturing method, both ends of the sheet after washing out the water-soluble bubble forming agent are overlapped and heat-sealed by a heat sealing machine, but the material is not a thermosetting resin such as rubber but a thermoplastic resin. Therefore, no special adhesive is required and there is an advantage that it can be heat-sealed as it is.
[0008]
Further, if the base material of the endless printing belt for rotation stamp described above is reinforced with a hot melt sheet with a reinforcing material, an even better endless printing belt can be obtained.
The reinforcing material can be a fabric in which plain, twill, or other fibers such as cotton, silk, rayon, nylon, polyester, etc., can be used. From a synthetic fiber having a fineness of 1d or less, called a very fine fiber, to a natural fiber having a fineness of 100d or more. Various fabrics using up to can be used. The same hot melt sheet and thermoplastic porous material as those described above can be used. In this case, the hot melt sheet naturally acts as a base material, but not only synthetic fibers but also natural fibers such as cotton. Since it adheres firmly, it also acts as an adhesive between the reinforcing material and the thermoplastic porous body.
[0009]
【Example】
Hereinafter, the present invention will be described in detail by way of examples. Example 1 is shown in FIG.
Reference numeral 2 denotes a base material, and a hot melt sheet made of porous polyethylene having a thickness of 0.2 mm that melts at 70 ° C. is used. As the hot melt sheet, a sheet that is made into a sheet without being stretched and does not shrink by heat is selected. As a result, it is possible to prevent defects during molding of the endless print belt.
Reference numeral 4 denotes a pedestal, which uses porous polyethylene that melts at 70 ° C. The pedestal 4 is formed with a printing portion 5 and a non-printing portion 6, and the non-printing portion 6 melts and solidifies the porous polyethylene in a portion corresponding to a margin other than characters and the like so that ink cannot ooze out. The printing part 5 is obtained by forming a non-porous protective film, and the printing part 5 is formed such that the part corresponding to characters and the like remains without being melted and solidified so that ink can be oozed out. By melting and solidifying the porous polyethylene, the difference in height between the printing part 5 and the non-printing part 6 is about 0.01 mm to 1.0 mm.
Next, the manufacturing method of a present Example is demonstrated.
First, a sodium chloride fine powder and carbon black are added to a polyethylene resin and kneaded to produce a plate-like sheet having a thickness of 2 mm. Next, this plate-like sheet is heated to 140 ° C. with a hot plate. Next, a release agent is applied to a mold engraved with only the base, the heated plate-like sheet is set therein, and a hot melt sheet having a thickness of 0.2 mm is placed on the polyethylene porous body. Further, a pressing plate is placed thereon and molded with a press for 30 seconds while applying a pressure of 200 kg / cm ² . Then, release the mold and take out the molded sheet. Next, the molded sheet is immersed in warm water to wash out sodium chloride, and when it is completely removed, it is dried. After sufficiently drying, a positive film in which required characters and the like are black and blanks are transparent is placed on the pedestal, and infrared rays are irradiated from the film side. Then, infrared rays are transmitted through the transparent film portion of the positive film to generate heat in the corresponding portion of the carbon to melt and solidify the sheet to form a non-porous protective coating, while the black film portion of the positive film generates heat by infrared rays. The porous body remains as it is without transmitting the temperature until the corresponding portion of the porous body is melted. Therefore, the pedestal is formed in a print portion where ink can be oozed and a non-print portion where ink cannot bleed. Next, both ends of the sheet are overlapped and heat-sealed by a heat sealing machine. The product thus obtained is cut into a required width to obtain an endless printing belt of this embodiment.
And ink is dripped and supplied from the base material side of the endless print belt, and this is incorporated into a known rotation mark and used.
Here, the sheet formed by adding sodium chloride fine powder to polyethylene resin that melts at 70 ° C. to form a plate does not melt even when heated to 140 ° C., although the details of the cause are unknown.
[0010]
Next, Example 2 is shown in FIG.
2 is a base material, and a hot melt sheet made of porous polyethylene having a thickness of 0.5 mm that melts at 80 ° C. is used. As the hot melt sheet, a sheet that is made into a sheet without being stretched and does not shrink by heat is selected. As a result, it is possible to prevent defects during molding of the endless print belt.
Reference numeral 4 denotes a pedestal, which uses porous polyethylene that melts at 80 ° C. The pedestal 4 is formed with a printing portion 5 and a non-printing portion 6, and the non-printing portion 6 melts and solidifies the porous polyethylene in a portion corresponding to a margin other than characters and the like so that ink cannot ooze out. The printing part 5 is obtained by forming a non-porous protective film, and the printing part 5 is formed such that the part corresponding to characters and the like remains without being melted and solidified so that ink can be oozed out. By melting and solidifying the porous polyethylene, the difference in height between the printing part 5 and the non-printing part 6 is about 0.01 mm to 1.0 mm.
Reference numeral 3 denotes a reinforcing material, which is a cotton cloth obtained by plain weaving of 120 yarns of double yarn in length / width of 120 / inch.
Next, the manufacturing method of Example 2 is demonstrated.
First, a sodium chloride fine powder is added to a polyethylene resin and kneaded to produce a plate-like sheet having a thickness of 2 mm. Next, this plate-like sheet is heated to 140 ° C. with a hot plate. Next, a release agent is applied to a mold engraved with the printing part of the pedestal only, the heated plate-like sheet is set therein, and a hot melt having a thickness of 0.5 mm with a polyethylene porous body is formed thereon. A sheet is placed on it, a cotton cloth in which weaving 120 yarns of 120 yarns in length and breadth / inch is placed on the sheet, and a pressing plate is placed on the sheet and molded with a press for 30 seconds while applying a pressure of 200 kg / cm ² . After that, release the mold and take out the molded sheet. Next, the molded sheet is immersed in warm water to wash out sodium chloride, and when it is completely removed, it is dried. After sufficiently drying, both ends of the molded sheet are overlapped and heat-sealed with a heat sealing machine. What is obtained in this way is cut to a required width and incorporated into a rotation mark. Next, the mold engraved with the required characters is heated to around 80 ° C, and the rotation mark is moved while rotating the endless print belt on the mold, and the margins other than the characters are melted and solidified to spread the ink. In addition to forming a non-porous protective coating that cannot be removed, only the characters and the like remain so as to be able to bleed out the ink, thereby obtaining an endless printing belt of this embodiment.
Then, different inks are dropped and supplied from the surface of the printing unit to each printing unit, and this is incorporated into a known rotation mark and used.
Here, it is natural that the hot melt sheet acts as a base material, but also acts as an adhesive between the reinforcing material and the thermoplastic porous body because it adheres firmly to the cotton cloth.
[0011]
【effect】
In the present invention, when a thermoplastic material is used for an endless printing belt for rotation stamping, hot melt is selected as a base material, so endless printing that can sufficiently withstand practical use without peeling off the pedestal even when used for a long period of time. I was able to get a belt.
In addition, since only a pedestal that does not have a printing part is manufactured once, and an endless printing belt that can form a printing part later is obtained, an endless printing belt in which a necessary number of characters and the like are formed when necessary is obtained. This eliminates the need to keep an inventory of useless finished products.
Also, in the present invention, an endless print belt is manufactured by heating a sheet formed by adding a water-soluble bubble forming agent to a plate instead of heating a mold, so that an expensive temperature control device is not necessary. In addition to simplifying the apparatus, the mold itself can be used without particular limitation as long as it has a melting point of 200 ° C. or higher.
In this manufacturing method, both ends of the sheet after washing out the water-soluble foam-forming agent are overlapped and heat-sealed with a heat sealing machine, but since the material is a thermoplastic resin, no special adhesive is required and heat is applied as it is. There is an advantage that it can be fused.
[0012]
[Brief description of the drawings]
1 is an endless printing belt according to a first embodiment of the present invention. FIG. 2 is an endless printing belt according to a second embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Endless printing belt 2 Base material 3 Reinforcement material 4 Base 5 Printing body 6 Non-printing part

Claims (4)

A sheet formed into a plate shape after kneading by adding at least a water-soluble foam forming agent to a thermoplastic substance is heated to 100 ° C. to 200 ° C., and the heated sheet is set in a mold engraving only a pedestal, A base material made of a hot melt sheet that does not shrink due to heat is placed on the substrate, and a molded product is placed on a push plate. After releasing, the water-soluble foam-forming agent is washed out and dried, and then a non-porous body is formed on the pedestal. A non-printing portion is formed by a protective coating, and both ends of the sheet are overlapped and heat-sealed by a heat sealing machine, and the hot melt sheet that does not shrink due to heat obtained by cutting the sheet is used as a base material. A method for producing an endless printing belt for rotary stamping, wherein a base made of a thermoplastic porous material is molded thereon. A sheet formed into a plate shape after kneading by adding at least a water-soluble foam forming agent to a thermoplastic substance is heated to 100 ° C. to 200 ° C., and the heated sheet is set in a mold engraving only a pedestal, A hot melt sheet that does not shrink due to heat is placed on it, a reinforcing material is placed thereon, a push plate is placed thereon , a mold is formed, the mold is released, and the water-soluble foam-forming agent is washed out and dried. A hot-melt sheet that does not shrink due to heat on a reinforcing material obtained by forming a non-printing part with a non-porous protective coating on the sheet, and heat-sealing both ends of the sheet with a heat sealing machine A process for producing an endless printing belt for rotary stamping, wherein a substrate on which the material is placed is used, and a base made of a thermoplastic porous body is molded on the hot melt sheet. A sheet formed into a plate shape after kneading by adding at least a water-soluble foam forming agent to a thermoplastic substance is heated to 100 ° C. to 200 ° C., and the heated sheet is set in a mold engraving only a pedestal, A base material made of a hot melt sheet that does not shrink due to heat is placed on it, further molded by placing a push plate, and after releasing the mold, the water-soluble foam-forming agent is washed out and dried, and then both ends of the sheet are overlapped. A hot-melt sheet that does not shrink due to heat obtained by heat-sealing with a heat-sealing machine and forming a non-printing portion with a non-porous protective coating on the pedestal is used as a base material, and a thermoplastic porous material is formed on the hot-melt sheet. A process for producing an endless printing belt for rotary stamping, which is formed by molding a pedestal comprising a body. A sheet formed into a plate shape after kneading by adding at least a water-soluble foam forming agent to a thermoplastic substance is heated to 100 ° C. to 200 ° C., and the heated sheet is set in a mold engraving only a pedestal, A hot melt sheet that does not shrink due to heat is placed on it, a reinforcing material is placed thereon, a push plate is placed on the molded sheet, and after releasing, the water-soluble foam-forming agent is washed out and dried, and then both ends of the sheet. A hot melt sheet that is not shrunk by heat is placed on a reinforcing material obtained by superimposing and heat-sealing with a heat sealing machine and forming a non-printing part with a non-porous protective coating on the pedestal. A method for producing an endless printing belt for rotary stamping, wherein a base material is formed on a base made of a thermoplastic porous body on the hot melt sheet.

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