JPH091904A - 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: The end of a web 3 is connected by using a double-sided sticky tape 4 having a strong sticky force in the state that two or more are superposed to a cylindrical member 2, and as the base material sheet 5 of the tape 4, a sheet for causing an interlayer release by a smaller force than the sticky force of the sticky surface of the tape 4 is used. When the web 3 is finished by the use in a printer, one sheet 5 of the tape 4 is caused for interlayer release by the torque of winding side to release the end of the web 3 from the member 2, and wound at the winding side as it is. Since no adhesive 6 is exposed with the end of the web 3, 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.

This is not limited to the take-up roll of the thermal transfer sheet described above, and the same applies to a take-up roll in which an image receiving sheet (sheet on which an image is formed) is wound around a tubular body such as a paper tube. Can be said.

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. Two or more double-sided pressure-sensitive adhesive tapes having a strong adhesive force are used in a state of being stacked on each other and joined to the tubular body. It is characterized by using paper that causes delamination. 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]

When the web take-up roll having the above-mentioned structure is used in a printer and the web is finished, the base sheet of one of the double-sided pressure-sensitive adhesive tapes causes delamination of the web by the torque on the take-up side. The end portion is peeled off from the tubular body and wound up 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 adhesive is not exposed after being peeled off, 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 includes a bobbin 2 and a thermal transfer sheet 3 wound on the bobbin 2.
The end portion of the thermal transfer sheet 3 is joined to the bobbin 2 by the double-sided adhesive tapes 4 and 4 in a two-ply state as shown in FIG. This double-sided adhesive tape 4
The base sheet 5 at the center and the pressure-sensitive adhesive 6 applied to both surfaces thereof are used. As the pressure-sensitive adhesive 6, a strong adhesive force is used. Paper that causes delamination with a force smaller than the adhesive force of the adhesive surface is used. Specifically, kraft paper, newsprint, etc. can be used as the base material sheet 5, and a strong adhesive type adhesive such as natural rubber or acrylic is used as the adhesive 6. A commercially available product of this type of double-sided adhesive tape 4 is "Free Tape P2" manufactured by Nippon Rika Paper Co., Ltd.
And the like.

Although the thermal transfer sheet 3 is wound onto the bobbin 2 after being bonded to the bobbin 2 as described above, the thermal transfer sheet 3 is wound under tension so that the thermal transfer sheet 3 is not loosened in order to prevent wrinkles. Therefore, as shown in FIG.
A force is applied in the direction of the arrow, and this force is received at the joint at the start of winding. Although the shearing force acts on the joint portion in this way, since the adhesive surfaces of the double-sided adhesive tapes 4 and 4 are strongly joined, they do not come off here, and the shearing force is concentrated on the base material sheets 5 and 5. To work. However,
Compared to the case where only one double-sided adhesive tape 4 is used,
The shearing force is dispersed between the two base material sheets 5 and 5 and the shearing force acting on each of the base material sheets 5 is halved. Therefore, even if a large tension is applied to the thermal transfer sheet 3 at the start of winding, the thermal transfer sheet 3 is torn. Never.

The double-sided adhesive tapes 4, 4 used for joining the bobbin 2 and the thermal transfer sheet 3 in a two-ply state
1 is provided over substantially the entire width of the thermal transfer sheet 3 in FIG. 1, but the present invention is not limited to this. For example, it may be provided only in the center of the thermal transfer sheet 3 as shown in FIG. 3, or as shown in FIG. Various changes can be made, such as providing only at both ends of the thermal transfer sheet 3, or providing at three locations as shown in FIG.

When the thermal transfer sheet 3 is to be peeled off from the bobbin 2, the base sheet 5 of either one of the double-sided adhesive tapes 4 is delaminated before the thermal transfer sheet 3 is peeled off on the adhesive surface with the double-sided adhesive tape 4. Will be awakened. in this case,
The total force required for peeling the thermal transfer sheet 3 from the bobbin 2 is preferably determined in consideration of the torque of the drive motor on the winding side in the printer, and a normal thermal transfer printer (recording width 10 to 30 cm) On the other hand, it is preferable to set so that delamination occurs when the winding tension is 200 g or less. With this setting,
The thermal transfer sheet 3 can be satisfactorily peeled off from the bobbin 2 and wound up without applying an excessive load to the drive motor on the winding side. The peeling force of the thermal transfer sheet 3 from the bobbin 2 can be easily adjusted by changing the width or length of the double-sided adhesive tape 4 used.

When the above-mentioned web take-up roll 1 is used in a thermal transfer printer with the thermal transfer sheet 3 wound on the bobbin 2, when the thermal transfer sheet 3 is used up, the torque of the drive motor on the take-up side causes As shown in FIG. 6 (a) or (b), the base sheet 5 of either one of the double-sided adhesive tapes 4 causes delamination, and the thermal transfer sheet 3 is easily peeled off from the bobbin 2 to the bobbin on the winding side. Being rolled 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 inside the printer,
Since the adhesive 6 is not exposed to the inside, the internal mechanism of the printer is not polluted. 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 double-sided adhesive tape 4 is used.
However, it is also possible to stack and use three or more sheets. Further, the web take-up roll 1 has been described as being attached to and detached from the thermal transfer printer as a single body, but the web take-up roll of the present invention may be used in the one having the bobbin on the take-up side set, May be used for a type in which these 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.

[0028]

As described above, in the web winding roll of the present invention, the end portion of the web and the tubular body are joined by using two or more double-sided adhesive tapes having a strong adhesive force in a stacked state,
As the base sheet of the double-sided pressure-sensitive adhesive tape, since the paper is used to cause delamination with a force smaller than the adhesive force of the pressure-sensitive adhesive surface of the double-sided pressure-sensitive adhesive tape, when the web is unwound and used in the printer, Since the base sheet of one of the double-sided pressure-sensitive adhesive tapes undergoes delamination due to the torque on the winding side, the end portion of the web can be easily peeled from the tubular body. Further, although the end portion of the web passes through the inside of the printer, since the adhesive is not exposed on the web, the internal mechanism of the printer is not polluted to cause trouble.

Further, when the end portion of the web is joined to the tubular body and wound up, the web is wound under tension in order to prevent slack, so that a shearing force acts on the joined portion. However, since this shearing force is dispersed and acts on each base sheet of the double-sided pressure-sensitive adhesive tape having two or more sheets, even if a large tension is applied to the web at the start of winding, the base sheet is ruptured and the bonded portion is It does not come off.

[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 a perspective view showing a web winding roll of another embodiment.

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 cross-sectional view showing a state where the web is peeled from the tubular body.

[Explanation of symbols]

 1 Web winding roll 2 Bobbin (cylindrical body) 3 Thermal transfer sheet (web) 4 Double-sided adhesive tape 5 Base material sheet 6 Adhesive

Claims (1)

[Claims] 1. A double-sided pressure-sensitive adhesive tape having a strong adhesive force between the end portion of the web and the tubular body in a web winding roll formed by joining the end portion of the web to the tubular body and winding the web. A web winding characterized by using papers that are bonded together in a stacked state of at least one sheet and used as the base sheet of the double-sided adhesive tape to cause delamination with a force smaller than the adhesive force of the adhesive surface of the double-sided adhesive tape. roll.