JP2001247261A - Bobbin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bobbin capable of adhering a thermal transfer sheet onto the bobbin with simple work without damaging the thermal transfer sheet when the thermal transfer sheet is adhered and taken up onto the bobbin. SOLUTION: In this bobbin 1 for supplying and/or taking-up the thermal transfer sheet, where a groove 2 is formed on an outer peripheral face of an end of the bobbin 1, the adhesive 3 is applied to the outer peripheral face, and the thermal transfer sheet 4 is adhered and taken up on the bobbin 1, the liquid adhesive 3 is applied to a predetermined position on the bobbin 1, and flows in the groove 2, whereby the squeezing-out of the excess adhesive 3 from the thermal transfer sheet 4 positioned on the adhesive 3 can be prevented, and the thermal transfer sheet 4 can be prevented from being damaged, and can be adhered and taken up onto the bobbin 1 with simple work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supply bobbin for winding a thermal transfer sheet used for thermal melting thermal transfer recording or sublimation type thermal transfer recording using a thermal head at the time of production,
The winding bobbin connected to the supply bobbin and the thermal transfer sheet is a thermal transfer printer that winds the thermal transfer sheet supplied from the supply bobbin, and relates to both bobbins.

[0002]

2. Description of the Related Art Conventionally, as a thermal transfer recording medium used in a thermal printer, a facsimile or the like, a thermal transfer sheet having a heat transferable ink layer or a sublimable dye ink layer on one surface of a base film has been used. ing.
Conventional thermal transfer sheets have a thickness of 10 to 10
A paper such as a capacitor paper or a paraffin paper having a thickness of about 20 μm, or a plastic film such as a polyester or cellophane having a thickness of about 3 to 20 μm was used, and a coloring agent such as a pigment or a dye was mixed with wax on the base film. A hot-melt ink or a sublimable dye dispersed or dissolved in a resin binder is applied to form a hot-melt ink layer or a sublimable dye ink layer. Then, from the back side of the base film, a predetermined position is heated and pressurized by a thermal head to melt or sublimate an ink layer at a portion corresponding to a printing portion in a heat-meltable ink layer or a sublimable dye ink layer, This is to perform printing by transferring to printing paper.

[0003] Further, since the thermal transfer sheet is long,
The heat transfer sheet is wound on a supply bobbin, the end of the heat transfer sheet is generally connected to a winding bobbin, and the heat transfer sheet after thermal transfer is wound on a winding bobbin. ing. Also, a gear for driving the supply bobbin and the winding bobbin with the printer is provided by a member separate from the bobbin, and the gear is attached to the end of the bobbin and set on the printer, or a gear is attached to the end of the bobbin. Are prepared integrally with the main body, and set in a printer. In order to adhere and fix the thermal transfer sheet on the bobbin, both are adhered with an adhesive tape or a double-sided adhesive tape, or a liquid adhesive is applied to the bobbin to adhere the thermal transfer sheet.

[0004]

However, when the above-mentioned adhesive tape or double-sided adhesive tape is used, a special tape bonding machine is required for tape bonding with a machine.
When applying the tape manually, the adhesive tape partially deforms the thermal transfer sheet wound on it,
The double-sided adhesive tape has a problem that it takes time to peel off the release paper. Further, when a liquid adhesive is applied on the outer periphery of the bobbin to bond the thermal transfer sheet, as shown in FIG. 4, the adhesive 3 protrudes from the edge of the thermal transfer sheet 4, and the thermal transfer sheet is wound. Problems tend to occur due to blocking of the thermal transfer sheet.

Accordingly, the present invention solves the above-mentioned problems, and when a thermal transfer sheet is adhered to a bobbin and wound up, the thermal transfer sheet is not damaged, and the thermal transfer sheet is adhered to the bobbin by a simple operation. It is intended to provide a bobbin that can be used.

[0006]

In order to achieve the above object, the present invention provides a bobbin for supplying and / or winding up a thermal transfer sheet, wherein a groove is provided on an outer peripheral surface at an end of the bobbin. By applying an adhesive, bonding and winding the thermal transfer sheet on the bobbin, the thermal transfer sheet can be bonded to the bobbin with a simple operation without causing damage to the thermal transfer sheet. . Further, the depth of the groove is preferably 10 to 100 μm, particularly preferably 20 to 60 μm, whereby the heat transfer sheet wound on the bobbin has a concave shape of the groove without blocking. There is no trouble caused by the trace. The depth of the groove is measured using a stylus type surface roughness measuring device. The grooves are preferably formed by integral molding during the injection molding of the bobbin, so that the bobbin can be manufactured efficiently with stable quality.

That is, according to the present invention, in a bobbin 1 for supplying and / or winding up a thermal transfer sheet, a groove 2 is provided on an outer peripheral surface of an end of the bobbin 1, and an adhesive 3 is applied to the outer peripheral surface to form a bobbin. A liquid adhesive 3 is applied to a predetermined position on the bobbin 1, and the adhesive 3 flows into the groove 2, and the adhesive 3 is wound. There is no excess adhesive 3 that protrudes from the thermal transfer sheet 4 located above the thermal transfer sheet 4, the thermal transfer sheet 4 is not damaged, and the thermal transfer sheet 4 can be adhered onto the bobbin 1 and rolled up by a simple operation. . (See Fig. 3)

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a bobbin 1 of the present invention.
In the bobbin 1 for supplying a thermal transfer sheet, two grooves 2 are provided on the outer peripheral surfaces at both ends of the bobbin 1, and an adhesive 3 is applied to the outer peripheral surface. 3, the bobbin 1 and the thermal transfer sheet 4 are adhered to each other.

FIG. 2 shows another embodiment of the bobbin 1 according to the present invention. In the bobbin 1 for supplying a thermal transfer sheet, grooves 2 are provided on the outer peripheral surfaces at both ends of the bobbin 1. An adhesive 3 is applied to the outer peripheral surface, and the bobbin 1 and the thermal transfer sheet 4 are adhered via the adhesive 3.
When such a bobbin is installed in a thermal transfer printer,
A bobbin gear is mounted on the bobbin or, although not shown, a bobbin having a gear portion attached to an end thereof is used, and a bobbin-side gear and a driving gear in a thermal transfer printer are used. The transfer of the thermal transfer sheet and the printing and recording are performed.

As shown in FIG. 5, the thermal transfer sheet used in the present invention is provided with a thermal transfer ink layer 6 on one surface of a substrate film 5 and, if necessary, a back surface on the other surface of the substrate film 5. This is a configuration in which a layer 7 is provided. (Base Film) As the base film 5 used in the heat transfer sheet wound on the bobbin of the present invention, the same base film as used in the conventional heat transfer sheet can be used as it is, and other base films can be used. Those can also be used and are not particularly limited. Specific examples of preferred base film include, for example, polyester, polypropylene, cellophane, polycarbonate, cellulose acetate, polyethylene, polyvinyl chloride, polystyrene, nylon, polyimide, polyvinylidene chloride,
Examples include plastics such as polyvinyl alcohol, fluororesin, chlorinated rubber, and ionomer; papers such as condenser paper and paraffin paper; and nonwoven fabrics, and a base film in which these are combined. The thickness of the substrate film can be appropriately changed depending on the material so that the strength and the thermal conductivity are appropriate, but the thickness is preferably, for example, 2 to 25 μm.

(Back Layer) It is also possible to provide a back layer 7 on the other surface of the base film in order to prevent the thermal head from sticking and to improve the slipperiness. The back layer is formed by suitably using a binder resin to which a slip agent, a surfactant, inorganic particles, organic particles, a pigment and the like are added. Binder resin used for the back layer, for example, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose acetate, cellulose acetate butyrate, cellulose resin such as nitrified cotton, polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal , Polyvinyl pyrrolidone, acrylic resin, polyacrylamide, vinyl resin such as acrylonitrile-styrene copolymer, polyester resin, polyurethane resin,
Silicone-modified or fluorine-modified urethane resin, etc.
can give.

Among these, it is preferable to use a cross-linked resin having several reactive groups, for example, an acid group, and using a polyisocyanate as a cross-linking agent in combination. Means for forming the back layer is, as described above, a slip agent, a surfactant, inorganic particles,
Organic particles, the material to which the pigment, etc. is added, is dissolved or dispersed in an appropriate solvent to prepare a coating solution, and the coating solution is coated by a conventional coating means such as a gravure coater, a roll coater, and a wire bar. , Coated and dried.

(Thermal Transfer Ink Layer) The thermal transfer ink layer 6 of the present invention is roughly classified into two types: a hot-melt transfer type and a sublimation transfer type. First, in the hot-melt transfer type, the thermal transfer ink layer is composed of a conventionally known coloring agent and binder, and if necessary, mineral oil, vegetable oil, higher fatty acids such as stearic acid, plasticizer, thermoplastic resin, filler and the like. What added various additives is used. Examples of the wax component used as the binder include microcrystalline wax, carnauba wax, and paraffin wax. Furthermore, Fischer-Tropsch wax, various low molecular weight polyethylenes, wood wax, beeswax, whale wax, Ibota wax, wool wax, shellac wax, candelilla wax, petrolactam, polyester wax, partially modified wax,
Various waxes such as fatty acid esters and fatty acid amides are used.

As the resin component used as the binder, for example, ethylene-vinyl acetate copolymer, ethylene-acrylate copolymer, polyethylene, polystyrene, polypropylene, polybutene, petroleum resin, vinyl chloride resin, vinyl chloride-acetic acid Vinyl copolymer, polyvinyl alcohol, vinylidene chloride resin, methacrylic resin, polyamide, polycarbonate, fluororesin, polyvinyl formal, polyvinyl butyral, acetylcellulose, nitrocellulose, polyvinyl acetate, polyisobutylene, ethyl cellulose or polyacetal and the like. In particular, those having a relatively low softening point conventionally used as a heat-sensitive adhesive, for example, a softening point of 60 to 85 ° C are preferable.

The colorant can be appropriately selected from known organic or inorganic pigments or dyes.
For example, having a sufficient coloring density, discoloration by light, heat, etc.
Those that do not fade are preferred. Further, it may be a substance that develops color by heating or a substance that develops color when it comes into contact with a component applied to the surface of the transfer-receiving body. Further, the color of the colorant is not limited to cyan, magenta, yellow, and black, and various colors of colorants can be used. Furthermore, to give the thermal transfer ink layer good thermal conductivity and thermal melt transferability,
A heat conductive substance may be blended as a filler for the binder. Examples of such a filler include carbonaceous substances such as carbon black, and metals and metal compounds such as aluminum, copper, tin oxide, and molybdenum disulfide.

The thermal transfer ink layer is formed by applying a coating liquid for forming a thermal transfer ink layer prepared by blending and adjusting a colorant component and a binder component as described above and, if necessary, a solvent component such as water and an organic solvent. Conventionally known methods such as hot melt coating, hot lacquer coating, gravure coating, gravure reverse coating, and roll coating are used. Also, there is a method of forming using an aqueous or non-aqueous emulsion coating liquid. The thickness of the thermal transfer ink layer should be determined so that the required print density and thermal sensitivity can be harmonized.
μm to 30 μm, preferably 1 μm to 20 μm
The degree is preferred.

The sublimation transfer type thermal transfer ink layer is prepared by adding a dye, a binder resin and other optional components in an appropriate solvent, and dissolving or dispersing each component. Is applied on the above-mentioned base film by a forming means such as a reverse roll coating method using, and dried to form. The dye to be used is not particularly limited, and any dye conventionally used in a thermal transfer sheet can be effectively used in the present invention. For example, some preferred dyes include MS Red G, Macrolex Red as red dyes.
Vioret R, Ceres Red 7B, Sa
maron Red HBSL, Resolin Re
d F3BS and the like, and as the yellow dye, holon brilliant yellow S-6GL, PTY-
52, Macrolex Yellow 6G, etc., and as the blue dye, Kayaset Blue 714, Waxolin Blue AP-FW, Holon Brilliant Blue S
-R, MS Blue 100 and the like.

As the binder resin for supporting the heat transferable dye as described above, any of conventionally known binder resins can be used. Preferred examples thereof include ethylcellulose, hydroxyethylcellulose, ethylhydroxycellulose, hydroxypropylcellulose, and the like. Methyl cellulose, cellulose acetate, cellulose resins such as cellulose acetate butyrate, polyvinyl alcohol, polyvinyl acetate,
Examples include vinyl resins such as polyvinyl butyral, polyvinyl acetal, polyvinyl pyrrolidone, and polyacrylamide, and polyesters. Further, in order to enhance the releasability from the receiving layer during printing, a polysiloxane segment grafted to the main chain of an acrylic, vinyl, polyester, polyurethane, polyamide or cellulose resin, a fluorocarbon segment, And a graft copolymer having at least one type of releasable segment selected from long-chain alkyl segments may be used as a binder resin for supporting the heat transferable dye. The formation of the thermal transfer ink layer is performed by using a conventionally known forming means as described above, and the coating thickness of the thermal transfer ink layer is 0.2 μm in a dry state.
m to 5 µm, preferably 0.4 µm to 2 µm.

(Adhesive) In the present invention, the adhesive 3 used for adhering the thermal transfer sheet on the bobbin is a pressure-sensitive adhesive using acrylic resin, synthetic rubber, or the like;
Conventionally known materials such as a heat-sensitive adhesive such as a vinyl acetate copolymer, a thermoplastic urethane resin, and an ionomer resin, and a water-based adhesive using a water-soluble resin such as polyvinyl alcohol, casein, and dispersible starch can be used. In addition, solvents such as water and alcohol can be used. The adhesive used in the present invention is applied on a bobbin, and when a thermal transfer sheet is overlaid on the adhesive, the layer on which the adhesive is applied is pushed by the thermal transfer sheet, a part of the adhesive flows out, and the extruded material is pushed out. The adhesive thus applied enters the grooves and is applied in a liquid state with a suitable fluidity. Among the above-mentioned various adhesives, especially the water-soluble adhesive hardly changes with time,
Ease of use (workability) during use is high and preferable. Examples of means for applying the above-mentioned adhesive to the bobbin include spray coating, brush coating, and a method using roller contact. The thickness of the adhesive applied on the bobbin is about 1 to 30 μm in a wet state.

(Bobbin) The bobbin 1 of the present invention can be generally formed by a conventionally known molding method such as injection molding, depending on its shape. The bobbin is made of polystyrene resin, polyvinyl chloride resin, acrylonitrile-butadiene-styrene copolymer resin (ABS resin), acrylonitrile-styrene copolymer resin (AS resin), methacrylic resin, polycarbonate resin, polysulfone resin,
Polyether sulfone resin, polyarylate resin, polyetherimide resin, polyamideimide resin, polyester resin (for example, polyethylene terephthalate resin or polybutylene terephthalate), modified polyphenylene oxide resin (for example, modified polyphenylene ether resin), polyimide resin, polyphenylene Sulfide resin, polyether ketone resin, polyether ether ketone resin, polyolefin resin such as polyethylene resin and polypropylene resin, polyacetal resin, polyester carbonate resin, liquid crystal polymer, thermoplastic resin such as elastomer, or a mixture of these and these An alloy resin composition composed of two or more resins is exemplified.

The bobbin may be made of a pulp material or a durable metal such as aluminum, iron, stainless steel or the like, which is provided in the printer and used repeatedly. Regarding the bobbin of the present invention, whether for supply or winding, the dimensions of the bobbin, such as the inner diameter, outer diameter, and length, are appropriately set according to the size of the cassette, printer, etc., on which the bobbin for winding the thermal transfer sheet is mounted. can do. The bobbin of the present invention is provided with a groove on the outer peripheral surface of the end of the bobbin, applying an adhesive to the outer peripheral surface, bonding a thermal transfer sheet on the bobbin and winding the bobbin. As shown in FIG. 1, it can be provided linearly at a fixed distance from the end (however, it is circular on the outer periphery of the bobbin), or it can be provided in a curved shape as shown in FIG. The shape, number, and the like of are not limited to the examples, and can be changed. Also, the groove formed on the bobbin is
Although not shown, it may be formed only on one end. Also, an example in which the groove on the bobbin surface is continuously formed on the outer circumference,
Although shown in the drawing, the groove may be divided along the circumference, and a portion having no groove may be provided in a direction perpendicular to the bobbin axis direction.

The above-mentioned groove is preferably formed by integral molding at the time of injection molding of the bobbin, and a shape corresponding to a male and female having a shape opposite to the concave shape of the groove is formed on a cavity surface of a mold of an injection molding machine. It is formed in advance. Then, the thermoplastic resin is injected into the cavity while being heated and melted. After the resin is cooled, the mold is opened and the molded product is taken out.

The method of forming the grooves is not limited to the above-mentioned injection molding method, but may be another molding method, a method of etching, a method of physically polishing a surface such as a sand blast method or a shot blast method, or the like. Alternatively, it may be processed by a method such as lathe cutting or laser processing. Grooves that can be formed by such various methods, especially when there are so-called burrs at corners that come into contact with the thermal transfer sheet, scratches on the thermal transfer sheet that comes into contact with the burrs and blocking of the front and back of the thermal transfer sheet. It is easy to occur. Therefore, it is important to form the groove so that there are no burrs at the corners. For example, it is necessary to add an R to the corresponding portion of the mold from the beginning or to grind the burrs after molding. Can be

As shown in FIG. 3, the depth 8 of the groove in the bobbin 1 of the present invention indicates the distance from the outer peripheral surface of the bobbin to the deepest position of the groove. The depth of the groove formed on the outer peripheral surface of the bobbin is about 10 to 100 μm, and preferably about 20 to 60 μm. As a result, FIG.
As shown in (a), when the adhesive 3 is applied to the outer peripheral surface of the bobbin and the thermal transfer sheet 4 is adhered on the bobbin 1,
As shown in FIG. 3B, the liquid adhesive 3 flows into the groove 2 and there is no excess adhesive 3 which protrudes from the thermal transfer sheet 4 located on the adhesive 3, ie, the bobbin. When the adhesive is applied to the outer peripheral surface and the thermal transfer sheet is immediately overlaid on the adhesive, the layer coated with the adhesive is pushed by the thermal transfer sheet, and a part of the adhesive flows out, and the extruded adhesive is applied. Almost all of the agent enters the groove and there is no, if any, small amount of adhesive that protrudes from the groove toward the end of the bobbin, so that the adhesive that has protruded from the groove leaks from the edge of the thermal transfer sheet. There is nothing. The depth of the groove is measured using a stylus type surface roughness measuring device.

The bobbin of the present invention can have, for example, a hollow cylindrical shape, and has a bobbin length of 200 to 30 for example.
0mm, bobbin circumference 15-35mm, bobbin thickness 1
Approximately 4mm, dimensional accuracy ± 0.3 in bobbin length
mm, bobbin outer circumference and bobbin wall thickness have a dimensional accuracy of ± 0.
A bobbin molded to about 1 mm is preferable because it can be used without any practical problems. The bobbin of the present invention
For example, it can be manufactured by injecting a polystyrene resin into a mold of an injection molding machine (in which a concave shape of a groove of a bobbin is previously formed on a cavity surface), and cooling and solidifying the resin. The thickness is 20 to 60 μm.

A liquid adhesive was applied to the outer periphery of the bobbin in a wet manner by a roller method under the condition of 10 μm, and a genuine thermal transfer sheet of a commercially available facsimile thermal transfer printer was wound up on the bobbin. As a result, the adhesive did not protrude from the edge of the thermal transfer sheet, and the thermal transfer sheet was not blocked after winding the thermal transfer sheet. The above-described bobbin of the present invention is not limited to the above-described embodiment, and can be configured from various things without departing from the present invention.

[0027]

As described above, according to the present invention, in a bobbin for supplying and / or winding up a thermal transfer sheet, a groove is provided on an outer peripheral surface of an end of the bobbin, and an adhesive is applied to the outer peripheral surface. Then, the thermal transfer sheet is adhered onto the bobbin and wound up. A liquid adhesive is applied to a predetermined position on the bobbin, and the adhesive flows into the groove and is positioned on the adhesive. There is no extra adhesive that sticks out of the heat transfer sheet, and the heat transfer sheet is not damaged, and the heat transfer sheet can be adhered to the bobbin and wound up by a simple operation.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a bobbin according to the present invention.

FIG. 2 is a front view showing another embodiment of the bobbin according to the present invention.

FIG. 3 is a schematic diagram illustrating a state in which an adhesive is applied to an outer peripheral surface which is a bobbin of the present invention and a state in which a thermal transfer sheet is superposed and adhered on the bobbin.

FIG. 4 is a schematic diagram illustrating a state in which an adhesive is applied to an outer peripheral surface which is a conventional bobbin, and a state in which a thermal transfer sheet is superimposed and adhered on the bobbin.

FIG. 5 is a sectional view showing one embodiment of a thermal transfer sheet.

[Explanation of symbols]

 Reference Signs List 1 bobbin 2 groove 3 adhesive 4 thermal transfer sheet 5 base film 6 thermal transfer ink layer 7 back layer 8 groove depth

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroyuki Yamashita 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 3F058 AA02 AB01 BB11 DA04 DB11 HA07 HB02 HB07

Claims (3)

[Claims] 1. A bobbin for supplying and / or winding up a thermal transfer sheet, wherein a groove is provided on an outer peripheral surface of an end of the bobbin, an adhesive is applied to the outer peripheral surface, and the thermal transfer sheet is adhered on the bobbin. A bobbin characterized by winding. 2. The bobbin according to claim 1, wherein said groove has a depth of 10 to 100 μm. 3. The method according to claim 1, wherein the groove is formed by integral molding at the time of injection molding of the bobbin.
Bobbins to be described in.