JPH091905A - Web winding roll - Google Patents

Abstract

PURPOSE: To make it possible to simply release the end of a web from a cylindrical member and to eliminate a trouble such as contamination even if the end of the web is passed through a printer. CONSTITUTION: Connecting tapes 4 are so mounted that sticky layers 6 become connecting surfaces with the end of a web 3 and a cylindrical member 2, and the connecting surfaces of the tapes 4 are superposed to laminate the end of the web 3 to the member 2. When the release force of the surface direction when the connecting surfaces are laminated is T1 and the release force in the direction perpendicular to the surface is T2 , the tape 4 having always the relation of T1 >T2 to be satisfied is used At the time of starting winding, the end of the web 3 can be wound without releasing from the member 3, and further, when the use of the web 3 in a printer is finished, the end of the web 3 is easily released from the member 2. Since the sticky layer 6 of the tape 4 remaining at the end of the web 3 is of weak sticky type, the internal mechanism is not contaminated when passing through the printer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web take-up roll obtained by winding a web which is a thermal transfer sheet or an image receiving sheet used in a printer for thermal transfer recording into a cylindrical body.

[0002]

2. Description of the Related Art Conventionally, a thermal transfer sheet having a color material layer provided on one surface of a base sheet and an image receiving sheet having an image receiving layer as needed are provided with a heating device such as a thermal head and a platen. It is pressed against the roller and selectively heats the heat generation part of the heating device according to the image information, and transfers the color material contained in the color material layer on the thermal transfer sheet to the image receiving sheet to record an image. Various methods have been proposed. Above all, a heat-sensitive melt transfer method and a heat-sensitive sublimation transfer method are widely used.

The former heat-sensitive melt transfer method is a thermal transfer sheet in which a base material sheet such as a plastic film has a base sheet such as a plastic film carrying a heat-melting ink layer in which a coloring material such as a pigment is dispersed in a binder such as a wax or a resin having a heat-melting property. It is an image forming method in which a coloring material is transferred together with a binder onto an image receiving sheet such as paper or a plastic sheet by applying energy according to image information of a heating device such as a thermal head. On the other hand, the latter thermal sublimation transfer method is a thermal transfer sheet in which a dye layer obtained by melting or dispersing a sublimable dye used as a coloring material in a binder resin is carried on a base material sheet such as a plastic film, and paper or a plastic sheet. By using an image receiving sheet provided with an image receiving layer on a support, by applying energy according to the image information of a heating device such as a thermal head, the sublimable dye contained in the dye layer on the thermal transfer sheet It is a method of recording an image by transferring it into the image receiving layer on the image receiving sheet.

The thermal transfer sheet used in these printers for thermal transfer recording is supplied in the form of a winding roll in which the thermal transfer sheet is wound around a bobbin which is a cylindrical body. Further, a bobbin on which a thermal transfer sheet is wound is used as a supply side bobbin, and a winding side bobbin on which the thermal transfer sheet is wound is set on the bobbin. Moreover,
It is also supplied that the supply side bobbin and the take-up side bobbin are mounted in a cassette case and the printer is replaced together with the cassette.

As one of such web winding rolls, there is a type in which the end portion of the thermal transfer sheet is firmly adhered to the bobbin with an adhesive or a double-sided adhesive tape. With this type, the thermal transfer sheet does not come off from the bobbin when the thermal transfer sheet is fully extended,
The running of the thermal transfer sheet stops and the tension increases,
The tension causes a load to be applied to the drive motor on the take-up side to increase the current. Therefore, by providing a means for detecting it, the end of the thermal transfer sheet is detected and the motor is stopped. . Or,
It is also known that an end mark is provided near the end of the thermal transfer sheet in order to prevent the motor from being loaded, and the recording means is stopped by detecting this end mark by the detection means on the printer side. There is.

Another type of web winding roll is one in which the end portion of the thermal transfer sheet is attached to the bobbin in a weakly adhered state. In this type, when the use of the thermal transfer sheet is finished in the printer, the thermal transfer sheet is removed from the bobbin by the winding torque, and the end of the thermal transfer sheet is detected by the change of the winding torque.

[0007]

In the former web take-up roll described in the prior art, the thermal transfer sheet is connected to the bobbin after use, and the thermal transfer sheet remains in the printer. Therefore, there is a problem that it is difficult to remove the bobbin from the printer or the cassette case after the thermal transfer sheet is fed out. Also,
In the latter web take-up roll, although the end portion of the thermal transfer sheet is easily peeled off from the bobbin, since the adhesive is attached to the end portion of the thermal transfer sheet,
The problem arises that the recording head of the printer, the platen roller, and other internal mechanisms are soiled.

The above is not limited to the above-described take-up roll for the thermal transfer sheet, and the same can be said for the take-up roll in which the image receiving sheet is wound around a tubular body such as a paper tube.

The present invention has been made in view of the above problems, and an object of the present invention is that the end portion of the web can be easily peeled from the tubular body, and the end portion can be removed. An object of the present invention is to provide a web winding roll that does not cause troubles such as dirt even when passing through the inside of the printer.

[0010]

In order to achieve the above object, the present invention provides a web winding roll formed by joining a web end portion to a tubular body and winding the web around the end portion of the web. A joining tape is attached to the tubular body so that the adhesive layer serves as a joining surface, and the end portions of the web are attached to the tubular body by overlapping the joining surfaces of the joining tapes. Cage,
Said joining tape T ₁ the peel force in the surface direction when the overlapped the joint faces and the direction perpendicular peeling force on the surface and T _2, characterized always T _1> the relationship between T ₂ holds I am trying. The adhesive tape used is a weak adhesive type adhesive tape that does not have an adhesive force by itself and that adheres when the adhesive surfaces are superposed on each other.
The web referred to here is a thermal transfer sheet or an image receiving sheet.

The image-receiving sheet used in the heat-sensitive melt transfer system is, for example, a synthetic paper such as polyolefin-based or polystyrene-based paper, high-quality paper, art paper, coated paper, cast-coated paper, wallpaper, backing paper, synthetic resin-impregnated paper. , Various papers such as emulsion-impregnated paper, synthetic rubber latex-impregnated paper, synthetic resin internal paper, paperboard, cellulose fiber paper, polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, polymethacrylate, polycarbonate, etc. Further, a white opaque film formed by adding a white pigment or a filler to these synthetic resins to form a film or a foamed sheet may be used, and is not particularly limited. Further, a laminated body made of any combination of these materials may be used. Typical examples in this case include cellulose fiber paper and synthetic paper, or cellulose fiber paper and plastic film or sheet laminated synthetic paper. The thickness of these image-receiving sheets may be arbitrary and is generally about 10 to 300 μm, for example.

The image receiving sheet used in the thermal sublimation transfer system is a sheet in which a dye receiving layer is formed on the surface of the image receiving sheet as a base sheet. When the adhesion between the base sheet and the dye receiving layer is poor, it is preferable to subject the surface thereof to primer treatment or corona discharge treatment. The dye receiving layer is for receiving the sublimable dye transferred from the thermal transfer sheet and maintaining the formed image. The dye receiving layer contains a thermoplastic resin, and examples of the thermoplastic resin include polyester resins, vinyl resins such as polyvinyl chloride resin, polycarbonate resins, polyvinyl butyral resins, acrylic resins, and cellulose resins. Any thermoplastic resin such as resin, olefin resin and polystyrene resin may be used.

Further, the image receiving sheet of the thermal sublimation transfer system is
An intermediate layer may be formed between the base sheet and the dye receiving layer. Such an intermediate layer is for improving the adhesiveness between the base sheet and the dye receiving layer, and can be formed of polyurethane resin, acrylic resin, polyethylene resin, polypropylene resin, epoxy resin, or the like, and has a large thickness. The thickness is preferably about 0.1 to 25 μm. Also,
A bubble-containing layer may be provided between the base sheet and the intermediate layer as described above. This bubble-containing layer can be formed by using a foaming agent, and the foaming agent used is decomposed by heat to generate oxygen,
Carbon dioxide gas, dinitropentamethylenetetramine that generates gas such as nitrogen, diazoaminobenzene, azobisisobutyronitrile, decomposing type foaming agents such as azodicarboxamide, low boiling point liquids such as butane and pentane are polyvinylidene chloride, Examples thereof include microballoons microencapsulated with a resin such as polyacrylonitrile. Further, an antistatic agent may be added to the dye receiving layer. The antistatic agent used is a known antistatic agent, for example, a cationic antistatic agent such as a quaternary ammonium salt or a polyamine derivative, an anionic antistatic agent such as an alkyl phosphate, or a nonionic antistatic agent such as a fatty acid ester. Etc. Further, a back surface layer may be provided on the side of the base sheet opposite to the side on which the receiving layer is provided.

The thermal transfer sheet used in the thermal melt transfer system is a substrate sheet carrying a hot melt ink layer. As the substrate sheet, glassine paper, condenser paper, thin paper such as paraffin paper, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyphenylene sulfide, polyether ketone, high heat-resistant polyester such as polyether sulfone, polypropylene, Examples include stretched or unstretched films of plastics such as polycarbonate, cellulose acetate, polyethylene derivatives, polyvinyl chloride, polyvinylidene chloride, polystyrene, polyamide, polyimide, polymethylpentene, and ionomer, and laminated layers of these materials. The thickness of the base sheet can be appropriately selected depending on the material so that the strength, heat resistance and the like are appropriate, but normally a thickness of about 1 to 100 μm is preferably used. The hot-melt ink layer provided on one surface of the base sheet is a layer made of a coloring material such as a pigment or a dye and wax or a thermoplastic resin.

Further, for the purpose of preventing thermal fusion with a heating device such as a thermal head and smoothing the running, a backing layer may be provided on the surface of the base material sheet which is in contact with the heating device. Examples of the resin used for the back surface layer include cellulosic resins such as ethyl cellulose, hydroxycellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate, cellulose acetate butyrate, and nitrocellulose, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal polyvinyl. Vinyl resins such as pyrrolidone, polymethylmethacrylate, polyethylacrylate, polyacrylamide,
Examples thereof include acrylic resins such as acrylonitrile-styrene copolymer, polyamide resins, polyvinyltoluene resins, coumarone indene resins, polyester resins, polyurethane resins, natural or synthetic resins such as silicone-modified or fluorine-modified urethane, or a mixture thereof. Among the above resins to further improve the heat resistance of the back layer, a resin having a hydroxyl group-based reactive group is used, and polyisocyanate or the like is used as a crosslinking agent to form a crosslinked resin layer. preferable.

Further, in order to provide slidability with the thermal head, a solid or liquid release agent or lubricant may be added to the back surface layer so as to provide heat resistant slipping property. Examples of release agents or lubricants include various waxes such as polyethylene wax and paraffin wax, higher aliphatic alcohols, organopolysiloxanes, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants. An activator, a fluorine-based surfactant, an organic carboxylic acid and its derivative, a fluorine-based resin, a silicone-based resin, fine particles of an inorganic compound such as talc, silica and the like can be taken out. The amount of the lubricant contained in the back layer is 5 to 50% by weight, preferably about 10 to 30% by weight.

The thermal transfer sheet used in the thermal sublimation transfer system is a substrate sheet on which a dye layer is carried. As the base material sheet, the same base material sheets as those used for the thermal transfer sheet of the heat-sensitive melting transfer method described above can be used, and the base material sheet is not particularly limited. The dye layer provided on one surface of the base sheet is a layer composed of a sublimable dye and a binder resin, and the dye sublimated and transferred by heat serves as a color material for forming an image. As the sublimable dye, the dye used in the conventional thermal transfer sheet can be used as it is,
There is no particular limitation. Further, the binder resin is, for example, a cellulose resin such as ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate, cellulose acetate butyrate, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl pyrrolidone, polyacrylamide, etc. Vinyl resins, polyesters and the like. Among these, heat resistance,
Cellulose-based, acetal-based, butyral-based, and polyester-based are particularly preferable in terms of dye transferability. Also,
In addition to the above-mentioned dye and binder resin, various conventionally known additives may be contained in the dye layer, if necessary. Further, the back layer constituting the thermal transfer sheet is the same as the thermal transfer sheet of the heat-sensitive fusion transfer system described above.

When the web (heat transfer sheet or image receiving sheet) as described above is wound around a tubular body, in the case of an image receiving sheet, it is preferable to wind the web with the receiving layer surface facing outside. Further, in the case of a thermal transfer sheet, it is preferable to wind the sheet with the surface of the hot melt ink layer or the dye layer facing outward.

[0019]

The web take-up roll having the above-mentioned structure does not easily peel off even if the joining surfaces of the joining tapes are stuck together and the web is pulled in the tangential direction of the tubular body, so the web is taken up into the tubular body. be able to. In addition, when the torque on the winding side exerts a force that pulls the web in the radial direction of the tubular body when the use of the web in the printer is completed, this pulling force causes the joining surface of the joining tape to separate and the web The end portion of is peeled off from the tubular body, and is wound on the winding side as it is. Then, when the load of the winding torque is reduced, the end of use of the web is detected on the printer side.
Alternatively, the end of use of the web is detected on the printer side because the web is not set at a predetermined position even after a lapse of a certain time. At this time, the end portion of the web passes through the inside of the printer, but since the joint surface after peeling is a weak adhesive type, the internal mechanism of the printer is not soiled.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a web winding roll which is an embodiment of the present invention, and FIG. 2 is a sectional view showing an enlarged main part. In this embodiment, a thermal transfer sheet is wound on a bobbin. The case will be described.

As shown in FIG. 1, the web winding roll 1 comprises a bobbin 2 and a thermal transfer sheet 3 wound on the bobbin 2, and the end portion of the thermal transfer sheet 3 is bonded onto the bobbin 2 by a bonding tape 4. ing. Specifically, as shown in FIG. 2, a joining tape 4 having a structure in which an adhesive layer 6 is provided on one surface of a support 5 on the end portion of the thermal transfer sheet 3 and the surface of the bobbin 2 is formed by a double-sided strong adhesive tape 7, respectively. The end faces of the thermal transfer sheet 3 are attached to the bobbin 2 by attaching and joining the joining surfaces of the joining tapes 4 and 4.

As shown in FIG. 3, the joining tape 4 has the peeling force in the surface direction when the joining surfaces are superposed on each other as T ₁ and the peeling force in the direction perpendicular to the surface as T ₂ . The one that always satisfies the relationship of T ₁ > T ₂ is used. That is, in the bonded state using this bonding tape 4 as shown in FIG. 2, the peeling force in the radial direction of the bobbin 2 is smaller than the peeling force in the tangential direction. In order to satisfy this condition, as the bonding tape 4, a weakly adhesive type adhesive tape 6 which is a bonding surface does not have adhesive strength by itself, but adheres when the bonding surfaces are superposed on each other. Then, the joint surface is easily peeled off by the peeling force T ₂ perpendicular to the surface,
The adhesive used for the adhesive layer 6 preferably has an adhesive force of 500 gf / 15 mm or less measured by the following test method.

<Test Method> Test piece (15 mm × 150 m
After the pressure sensitive adhesives of m) are overlapped with each other and pressure-reciprocated by a 1 kg pressure plastic roll for two reciprocations, the adhesive force when T-type peeling is performed at a tensile speed of 300 mm / min is measured.

Kraft paper or the like is used as the support 5 of the joining tape 4, and a weak adhesive type adhesive such as natural rubber or acrylic is used as the adhesive layer 6. In the present embodiment, “Selfa M-73P” manufactured by Nippon Rika Paper Co., Ltd. was used as the joining tape 4. As the double-sided strong adhesive tape 7, "# 751B" manufactured by Teraoka Seisakusho Co., Ltd. was used.

The joining tape 4 used for joining the bobbin 2 and the thermal transfer sheet 3 is provided over almost the entire width of the thermal transfer sheet 3 in FIG. 1, but the present invention is not limited to this, and for example, as shown in FIG. 4, it may be provided only at the center of the thermal transfer sheet 3, or it may be provided only at both ends of the thermal transfer sheet 3 as shown in FIG. 5, or it may be provided at three locations as shown in FIG. is there.

As described above, the end portion of the thermal transfer sheet 3 is joined to the bobbin 2 and then wound up. However, in order to prevent wrinkles, the thermal transfer sheet 3 is wound up under tension so as not to loosen. . Therefore, at the start of winding, a force is applied to the joining surfaces of the joining tapes 4 and 4 in the tangential direction of the bobbin 2. Thus, the peeling force in the surface direction acts on the joining portion, but the joining surfaces of the joining tapes 4 and 4 do not come off, and the thermal transfer sheet 3 can be wound up.

When the above-mentioned web winding roll 1 is used in a printer with the thermal transfer sheet 3 wound on the bobbin 2, when the thermal transfer sheet 3 is used up, the bobbins on the bonding surfaces of the bonding tapes 4 and 4 are finished. Although the peeling force acts in the radial direction of 2, the peeling easily occurs when a force in the direction perpendicular to the joining surface is applied, so good thermal transfer can be achieved without applying an excessive load to the drive motor on the winding side. The sheet 3 can be peeled off from the bobbin 2 and wound up. In this way, when the thermal transfer sheet 3 is peeled off, the winding torque on the winding side changes, so that the end of the thermal transfer sheet 3 can be detected by the detection unit on the printer side. Alternatively, the end of the thermal transfer sheet 3 can be detected by providing the printer with means for detecting that the thermal transfer sheet 3 is not set at a predetermined position even after a certain period of time. At this time, the end portion of the thermal transfer sheet 3 passes through the inside of the printer, but the adhesive layer 6 of the joining tape 4 remaining on the thermal transfer sheet 3 is of a weak adhesive type and does not stain the internal mechanism of the printer. Further, when replacing the bobbin 2 on the supply side, only the empty bobbin needs to be removed, which facilitates the work.

In the above embodiment, the web take-up roll 1 is attached to and removed from the printer as a single unit, but the web take-up roll of the present invention is used for the bobbin on the take-up side. Alternatively, they may be used in a type in which they are mounted in a cassette case. Further, in the above-mentioned embodiment, the one in which the thermal transfer sheet is wound around the bobbin has been described, but the present invention can be similarly applied to the one in which the image receiving sheet is wound around the paper tube or the like.

[0030]

As described above, in the web winding roll of the present invention, the joining tape is attached to the end portion of the web and the tubular body so that the adhesive layers serve as the joining surfaces, and these joining tapes are joined together. The end portions of the web are adhered to the tubular body by superposing the surfaces, and the joining tape has a peeling force in the surface direction T ₁ when the joining surfaces are overlapped with each other, and a joining tape in a direction perpendicular to the surfaces. When the peeling force is T ₂ , the relationship of T ₁ > T ₂ is always established, so that the winding operation can be performed without peeling the end portion of the web from the tubular body at the start of winding. Moreover, the end portion of the web can be easily peeled from the tubular body when the use of the web in the printer is finished. Further, although the end portion of the web passes through the inside of the printer, since the adhesive layer of the joining tape remaining on the web is a weak adhesive type, the internal mechanism of the printer is not polluted to cause trouble.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a web winding roll according to the present invention.

FIG. 2 is an enlarged sectional view showing a main part of FIG. 1;

FIG. 3 is an explanatory diagram showing a relationship of a peeling force when the joining tapes are overlapped with each other.

FIG. 4 is a perspective view showing a web winding roll of another embodiment.

FIG. 5 is a perspective view showing a web winding roll of another embodiment.

FIG. 6 is a perspective view showing a web winding roll of another embodiment.

[Explanation of symbols]

 1 Web winding roll 2 Bobbin (cylindrical body) 3 Thermal transfer sheet (web) 4 Bonding tape 5 Support 6 Adhesive layer 7 Double-sided strong adhesive tape

Claims (2)

[Claims] 1. In a web winding roll formed by joining a web end portion to a tubular body and winding the web, an adhesive layer serves as a joining surface on each of the web end portion and the tubular body. The joining tape is attached to, and the end portion of the web is stuck to the tubular body by overlapping the joining surfaces of these joining tapes,
Said joining tape T ₁ the peel force in the surface direction when the overlapped the joint faces and the direction perpendicular peeling force on the surface and T _2, characterized always T _1> the relationship between T ₂ holds Web winding roll to be. 2. The web take-up roll according to claim 1, wherein the bonding tape is of a weak adhesive type in which the adhesive layer serving as the bonding surface has no adhesive force by itself and adheres when the bonding surfaces are superposed on each other.