JPH10217622A - Receptor tucked sheet for heat transfer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a hole on an end surface without trouble such as the adhesion of sheets to each other by forming an adhesive layer of which the adhesion and the applying amount are specified. SOLUTION: An adhesive layer which is formed on the opposite surface from a heat transfer receptor layer is adjusted in such a manner that the applying amount of an adhesive is 5-15g/m<2> by a dry weight, and also, the adhesion by a measuring method (180 deg. separation) conforming to JIS Z 0237 may become 7-20N/25mm. In this case, when the adhesion exceeds 20N/25mm, the protrusion of the adhesive from a punched hole part and an end surface becomes conspicuous when the punched hole is made or cut into a specified dimension, and the adhesive contaminates a punching blade and a cutting blade, or the adhesion of sheets to each other, or the contamination of a printed image surface are induced. On the contrary, when the adhesion becomes less than 7N/25mm, the adhesion with a release sheet decreases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal transfer receiving sheet suitable for a thermal transfer system, particularly a sublimation type thermal transfer recording system. To be more specific, the receiving sheet portion has a pressure-sensitive adhesive layer on the back surface and a release sheet. After forming a thermal transfer image on the receiving sheet portion, the receiving sheet portion is peeled off from the release sheet, and the receiving sheet portion is adhered to an article or the like. The present invention relates to a thermal transfer receiving tack sheet (hereinafter referred to as a receiving tack sheet) that can be adhered via an agent layer.

[0002]

2. Description of the Related Art In recent years, the development of a color hard copy of a thermal transfer system, particularly a printer of a sublimation type thermal transfer system has been rapidly progressing. In a sublimation type thermal transfer printer, a ribbon including a sublimation dye layer of three colors (yellow, magenta, cyan) or four colors (yellow, magenta, cyan, black) is heated by sequentially controlling the heating energy of the thermal head. By changing the transfer amounts of the respective dyes, it is possible to transfer and form a full-color image having a density gradation. With such a thermal transfer printer, a TV image or an image taken by a video camera is printed on a sticker, and a thermal transfer image can be attached to an arbitrary article, for example, a sticker of the person image is attached to a business card. Attention has been paid.

A receiving sheet suitable for such a sticker includes a dye image receiving layer formed on one surface of a receiving sheet substrate and a receiving sheet portion having an adhesive layer formed on the opposite side of the substrate. A so-called tack paper type receiving tack sheet in which a release sheet is bonded to the surface of the pressure-sensitive adhesive layer has been proposed.

[0004]

In the conventional receiving tack sheet, papers, synthetic papers,
Films and the like are used, but from the problem of image quality, generally, at least a film or synthetic paper made of PET or polyolefin, or a laminate of a laminated film or synthetic paper,
It is composed of a laminate or the like obtained by laminating a film, a synthetic paper and papers. When such a film, synthetic paper or a laminate is used, because there is no permeation of the adhesive into the receiving sheet portion as compared to the description of only the paper, for example, when cutting to a predetermined size, the sheets are stacked and stored. In some cases, such as when punching holes or the like, the adhesive sticks out of the end face or the part where the hole was punched, and the blade of the punch machine is damaged by the adhesive, or the adhesive is stuck on the blade. Is dirty,
Alternatively, when the receiving tack sheets are overlapped with each other, the sheets stick to each other, which is a problem.

[0005]

Means for Solving the Problems In view of such a situation, the present inventors have conducted intensive studies and as a result, have determined that the pressure-sensitive adhesive layer has been JISZ0.
Adhesive strength of 7 according to the measurement method (180 ° peeling) according to 237
２０20 N / 25 mm and the amount of the adhesive applied is 5 to 15 g / m ² by dry weight, so that the adhesive sticks to the punching blade due to the protrusion of the adhesive from the perforated end face. The present invention has provided a receiving tack sheet capable of forming at least one or more holes on an end face without trouble such as adhesion of an agent and sticking between sheets. By using a receiving tack sheet that can be provided with a punched hole or the like as described above, a hole is formed in the sheet, filing is performed, and the receiving sheet portion (for example, a seal) is functionally stored or the receiving sheet portion is peeled off. It is possible to temporarily store another seal in the release sheet portion by utilizing the later, or to peel off the stored seal again to adhere to any article.

(1) The present invention relates to a heat transfer receiving device on one side of a support.
The other side of the thermal transfer receiving sheet provided with the
To the receiving tack sheet for thermal transfer
And the pressure-sensitive adhesive layer is measured according to JIS Z 0237
(180 ° peeling) adhesive strength is 7-20N / 25mm
And the coating amount of the adhesive is 5 to 15 g / m in dry weight.
^TwoThe receiving tack sheet for thermal transfer formed so that
You.

(2) The receiving sheet for thermal transfer according to (1), wherein the receiving sheet for thermal transfer has at least one hole. (3) The thermal transfer receiving tack sheet according to (1), wherein the thermal transfer receiving tack sheet is half-cut for holes from the back surface to the release sheet or from the front surface to the thermal transfer receiving sheet. (4) The heat transfer receiving tack sheet according to any one of (1) to (3), wherein the surface of the support on which the pressure-sensitive adhesive layer is formed is formed of a film or synthetic paper.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As the receiving sheet portion of the receiving tack sheet according to the present invention, a known heat transfer receiving sheet such as a sublimation type or a fusion type can be used. Specifically, it has a configuration in which a thermal transfer receiving layer is provided on one surface of a support. Examples of the support include a paper base such as coated paper, art paper and woodfree paper, a laminated paper obtained by laminating a resin such as polyethylene on a paper base, a film of polyester, nylon, polyolefin (for example, polypropylene) and a synthetic paper. Is done. These may be laminated in two or more layers. In the case of sublimation transfer,
(Film and synthetic paper) / (Paper base) / (Film and synthetic paper), (Film and synthetic paper) / (PET film) /
(Film or synthetic paper) is preferable because a clear image can be obtained and the texture of a business card can be obtained.

Preferably, the film or synthetic paper is foamed or has a core layer and a skin layer. In the case of a paper substrate, there is no particular limitation as long as it is mainly composed of cellulose pulp. For example, wood pulp such as coniferous or hardwood chemical pulp and mechanical pulp, waste paper pulp and the like can be appropriately selected and used, and non-wood pulp such as hemp and cotton;
Synthetic pulp made from polyethylene, polypropylene or the like can be used in combination.

The thermal transfer receiving layer provided on one side of the support may be any layer that receives the dye transferred from the ink ribbon. For example, in the case of a sublimation type receiving layer, any resin layer capable of dyeing a dyeing dye may be used. Specifically, a resin having good affinity for the dyeing dye is preferably used, and examples thereof include a polyester resin, a polycarbonate resin, a vinyl chloride copolymer, and a cellulose derivative. For the purpose of preventing fusion with the ink ribbon due to heating of the thermal head during printing, it is preferable to add a crosslinking agent, a slipping agent, a release agent, and the like as necessary. If necessary, a fluorescent dye, a plasticizer, an antioxidant, a pigment, an ultraviolet absorber and the like may be added to the receiving layer. These additives may be mixed with the main component of the receiving layer and applied, or may be applied as a separate coating layer above and / or below the receiving layer.

The thermal transfer receiving layer is formed by applying and drying a coating liquid for forming a receiving layer according to a conventional method using a known coater such as a bar coater, a gravure coater, a comma coater, a blade coater, or an air knife coater. Can be. The coating amount of the receiving layer was 1 to 12 g / m ^{2 by} dry weight.
And more preferably 3 to 10 g / m
^{About 2} . By the way, when the thermal transfer receiving layer is less than 1 g / m ² , defects such as deterioration of an image and decrease in gloss of a printed surface may occur. The thermal transfer receiving layer is 12
If it exceeds g / m ² , the effect is saturated and not only is uneconomical, but also the print density may decrease. In order to prevent the thermal transfer receiving layer from fusing with the ink ribbon due to heating of the thermal head during printing, it is preferable that a crosslinking agent, a slipping agent, a release agent, or the like is added as necessary. . If necessary, a fluorescent dye, a plasticizer, an antioxidant, a pigment, an ultraviolet absorber and the like may be added to the receiving layer. These additives may be mixed with the main component of the receiving layer and applied, or may be applied as a separate coating layer above and / or below the receiving layer.

According to the present invention, the pressure-sensitive adhesive layer formed on the opposite surface of the heat transfer receiving layer is coated with the pressure-sensitive adhesive in a dry weight of 5 to 15 g.
/ M ^2, and the adhesive strength of the measuring method in accordance with JIS Z 0237 (180 ° peeling) is an essential requirement to be adjusted so that 7~20N / 25mm. By the way, if the adhesive strength exceeds 20N / 25mm, when punching a hole or cutting to a predetermined size, the adhesive will protrude significantly from the punch hole portion or the end face, and the punch blade or cutting blade This can lead to soiling, sticking between sheets, and stains on the stamp screen. Conversely, when the adhesive strength is less than 7 N / 25 mm, the adhesive strength with the release sheet is reduced, and the receiving sheet portion is peeled off while traveling in the printer, causing poor traveling or sticking to any article. It is easy to peel off or sticks poorly. Such an adhesive layer having a low adhesive strength is formed, but the coating amount is 15 g.
If it exceeds / m ² , even if the adhesive strength satisfies the above conditions, the adhesive layer will be so thick that the adhesive will protrude significantly from the end face of the hole, and the punching blade will be consumed or the sheets will stick together. However, problems such as stains on the printing screen occur. Conversely, when the coating amount is less than 5 g / m ² , the adhesive strength with the release substrate is reduced, and the receiving sheet portion is peeled off while traveling in the printer, resulting in poor traveling.

As the pressure-sensitive adhesive used in the present invention, known pressure-sensitive adhesives such as acrylic, synthetic rubber, natural rubber, and silicone can be used. Adhesive, if necessary,
Crosslinking agents and fillers can be added. As a cross-linking agent, a polyfunctional isocyanate compound or an epoxy compound can be used. Specific examples include known compounds such as hexamethylene diisocyanate and glycidyl methacrylate. The adhesive strength, the protrusion of the adhesive from the end face, and the like can be controlled by the amount of the crosslinking agent, that is, the crosslinking density.

Although the pressure-sensitive adhesive layer is protected by the release sheet, it prevents running troubles such as peeling of the release sheet in the printer, and does not make it difficult to peel off the seal after printing. When the peeling force between the receiving sheet portion and the release sheet is measured at a peeling speed of 90 mm / min, 2 to 15 g / 20 mm (the dye thermal transfer receiving tack sheet is cut to a width of 20 mm, and the receiving sheet portion is 180 ° from the release sheet. (The load applied when the film is peeled off at the same pulling angle).

The pressure-sensitive adhesive may be applied to the surface of the release agent layer of the release sheet and dried, and then adhered to the back surface of the receiving sheet having the image receiving layer on the front side, or the back surface of the receiving sheet. After applying and drying the adhesive, the release agent layer surface of the release sheet may be bonded to the adhesive.

As the release sheet of the present invention, a known release sheet can be used. Specifically, the release sheet has a configuration in which a release agent layer having a release agent such as silicone is provided on a release sheet substrate. As a release sheet substrate, PET film, foamed PET film, polyolefin-based synthetic paper,
Composite film, base paper such as high-quality paper containing cellulose pulp as a main component, glassine paper, kraft paper, medium-grade paper, coated paper, or the like, or a sheet obtained by laminating a thermoplastic resin such as a polyethylene resin on at least one side of the base paper Used.

The thermoplastic resin used for lamination is not particularly limited, but is composed of two or more homopolymers such as low-density polyethylene, high-density polyethylene, polypropylene, polybutene and polypentene, and olefins such as ethylene-propylene copolymer. It is a copolymer or a linear low-density polyethylene which is a copolymer of ethylene and an α-olefin, and a mixture thereof. Those having various densities and melt indices can be used alone or as a mixture thereof. Further, a white pigment may be contained in the thermoplastic resin. White pigments include titanium dioxide, zinc sulfide, zinc oxide, calcium sulfate, calcium sulfite, barium sulfate, clay, calcined clay, talc, kaolin, calcium carbonate, silica, calcium silicate, etc. You can freely choose from those known for use. Also,
Resin metal salts such as stearamide and zinc stearate, various antioxidants such as hindered phenol, pigments and dyes such as cobalt blue and ultramarine blue, fluorescent brighteners, ultraviolet absorbers, antiblocking agents, slip agents, etc. They may be added in appropriate combination. Lamination amount is 5 to 40 g / m
² is preferred. Dattari less insufficient the sealing of silicon 5 g / m ^2, such as a so-called adhesive residue Correspondingly, cause aging of the adhesive properties, further, control of the density unevenness and print curling becomes difficult, a 40 g / m ² Beyond that, the effect becomes supersaturated and uneconomical.

The basis weight of the release sheet substrate is not particularly limited, but is preferably from 60 to 250 g / m ² . When the basis weight is less than 60 g / m ^2, it is difficult to suppress curling after printing, and when the basis weight is more than 250 g / m ² , it is difficult to design a printer.

The method of applying the release agent such as silicone to the release sheet substrate used in the present invention can be carried out using a gravure coater or a bar coater. ~1.5g / m ^2, preferably,
0.5 to 1.2 g / m ² is appropriate. At a coating amount of less than 0.3 g / m ² , the dispersion of the peeling performance is large, and
If the coating amount exceeds 1.5 g / m ² , the necessity is low from the viewpoint of economy.

A receiving tack sheet is provided inside the printer.
When running, prevent running trouble caused by static electricity
Therefore, on the front and / or back side of the receiving tack sheet,
At least one antistatic layer can be provided
You. For example, binder resin and antistatic agent as main components
May be coated on the back surface. Binder tree
As the fat, a known polymer binder is arbitrarily selected.
Can be used, polyester, polyurethane, melamine
-Based, acrylic-based, phenol-based, and urea-based binders
Other than vinyl acetate resin emulsion, acrylic emulsion
Emulsion, polyolefin emulsion, cellulose derivative
And polyvinyl alcohol. Back coating
The coating amount of the layer is 0.3 to 1.5 g / m ^TwoIn the range of
Is preferred. This coating amount is 0.3 g / m^TwoLess than
Damages the receiving layer when the receiving layer and the backside rub against each other
May not be sufficiently prevented, and 1.5 g / m^TwoOver
If it is obtained, the effect will be saturated and uneconomical.

According to the present invention, by adopting such a configuration, a receiving tack sheet which does not cause trouble even when a hole or the like is formed. The size, shape, position, and the like of the hole in the present invention may be arbitrarily determined according to the intended use, and are not particularly limited. The number of holes may be one or two depending on the purpose. For example, when filing is intended, holes may be formed along one side of the sheet according to the shape of the file. Of course, six holes may be formed for the system organizer, or many holes may be formed for the binder. The hole is formed by a known method such as a punch, one by one,
Alternatively, a plurality of sheets may be stacked.

In the thermal transfer receiving tack sheet, the release sheet may be subjected to half cuts for holes from the back surface, or the thermal transfer receiving sheet may be subjected to half cuts for holes from the front surface. In the former case, a hole in the release sheet appears when the user removes the residue from the receiving sheet portion on the surface. In the latter case, a hole in the receiving sheet portion appears when the user partially peels off the release sheet on the back surface. In both cases, the holes can be easily formed by the user's will.
Of course, the size and shape of the half cut for the hole in this case,
The position, the number, etc. may be arbitrarily opened according to the application. This method of forming holes by half cutting is particularly useful when the number of holes is large. This is because if a hole is formed before printing, the rigidity of the portion where the hole is formed becomes extremely small, so that troubles such as sheet jamming in the printer easily occur. On the other hand, when the half cut for the hole is performed, since no holes are formed at the time of printing, no trouble occurs, and the hole can be easily formed by the user. .

[0023]

The present invention will be described in detail with reference to the following examples, but the scope of the present invention is not limited to these examples.
In Examples, “%” and “parts” all indicate “% by weight” and “parts by weight” unless otherwise specified.

Example 1 A composite film having a multilayer structure of a clear layer and a void layer and having a thickness of 50 μm (manufactured by Toray, trade name: 50E63) was used as a base material for a sealing portion, and a dye image receiving layer was formed on one surface thereof. For the formation, Paint 1 having the following composition was applied by a die coating method at a solid content of 8 g / m ² and dried.

[Paint 1] Ingredients Component parts by weight Saturated polyester resin (manufactured by Toyobo, trade name: Byron 200) 100 parts Silicone resin (manufactured by Toray Dow Corning Silicone, trade name: SH3746) 5 parts Toluene / methyl ethyl ketone = 5/1 1 with mixed solvent
Diluted to 8%.

As the release paper substrate, release paper in which polyethylene-based resin was laminated on both sides of high-quality paper was used. On one side, a silicone release agent (Shin-Etsu Chemical Co., Ltd., trade name:
KS-830) is applied by a gravure coating method to a solid content of 0.6 g / m ² and dried to form a release agent layer, and an antistatic layer is formed on the surface opposite to the silicon surface. A coating material 2 having the following composition was applied by a bar coating method at a solid content of 0.5 g / m ² and dried to prepare a release paper.

[Paint 2] Component Weight parts Acrylic resin (Chuo Rika, trade name: Ricabond SA-R615A) 100 parts Epoxy curing agent (Chuo Rika, trade name: Ricabond SA-R615B) 5 parts Conductive agent (Mitsubishi 75 parts silica pigment (trade name: P78A, manufactured by Mizusawa Chemical Co., Ltd.) 30 parts Diluted to 12% with a mixed solution of denatured isopropyl alcohol / water = 8/2.

An acrylic emulsion-type pressure-sensitive adhesive (manufactured by Nippon Carbide, trade name: PE-1) is provided on the release agent layer.
15E) as a main component, a paint 3 having the following composition is applied, a release paper portion and a seal portion are superposed and adhered, and 2 cm × 2 cm
Was cut to obtain a thermal transfer receiving tack sheet. The pressure-sensitive adhesive had an adhesive strength of 10 N / 25 mm and a coating amount of 15 g / m ² .

[Paint 3] Ingredient: 100 parts by weight Acrylic pressure-sensitive adhesive (trade name: PE-115E, manufactured by Nippon Carbide) 1 part: Isocyanate-based curing agent (trade name: CK-101, manufactured by Nippon Carbide) Agent (manufactured by Nippon Carbide, trade name: CK-202) 3 parts Diluted to 20% with ethyl acetate solution.

Example 2 In the same manner as in Example 1, a receiving tack sheet for dye thermal transfer was obtained. However, the mixing ratio of the curing agent for the adhesive is PE-11.
5E / CK-101 / CK-202 = 100/0/1. The pressure-sensitive adhesive had an adhesive strength of 18 N / 25 mm and a coating amount of 5 g / m ² .

Comparative Example 1 In the same manner as in Example 1, a dye thermal transfer receiving tack sheet was prepared. However, the mixing ratio of the curing agent for the adhesive is PE-1
15E / CK-101 / CK-202 = 100/0 /
0.5. The adhesive had an adhesive strength of 22 N / 25 mm and a coating amount of 14 g / m ² .

Comparative Example 2 A dye thermal transfer receiving tack sheet was prepared in the same manner as in Example 2. However, the adhesive strength of the adhesive was 18 N / 25 mm, and the coating amount was 4 g / m ² .

Comparative Example 3 A dye thermal transfer receiving tack sheet was prepared in the same manner as in Example 1.
Produced. However, the mixing ratio of the curing agent for the adhesive is PE-1
15E / CK-101 / CK-202 = 100/3/5
And The adhesive strength of the adhesive is 5N / 25mm,
The amount is 15 g / m ^Two Met.

Evaluation method (1) Adhesion of sheets The dye thermal transfer receiving tack sheet was cut into A6 size sheets, and punched holes were formed at six locations in a stack of five sheets. ：: There was no sticking between the sheets. ×: Sheets stick to each other

(2) Blade Smear After punch holes were made in the same manner as in (1), the degree of soiling of the punch blade was visually evaluated. ：: There is no deposit on the blade. X: There is a deposit on the blade.

(3) Dirt on the Print Screen After punching holes in the same manner as in (1), using a commercially available sublimation video printer (manufactured by Sony, trade name: UP-1800), step and gradation are applied to the receiving tack sheet. Print the pattern, print density on the image print side,
White spots and image unevenness were visually observed and organoleptically evaluated. ：: Excellent. X: Inferior.

(4) Runnability A dye thermal transfer receiving tack sheet having punched holes in the same manner as in (1) and a dye thermal transfer receiving tack sheet having six half-cuts for holes formed on a release sheet from the back side were commercially available. Sublimation video printer (Sony, product name: UP
-1800) was used to continuously print 100 solid black sheets, and it was evaluated whether the printing was normally performed without running trouble. ：: Normal printing was possible. ：: The sheet was occasionally jammed, but at a level having no practical problem. C: Sheet clogging frequently occurred, which was at a level having a practical problem.

[0038]

[Table 1]

[0039]

The receiving tack sheet for thermal transfer of the present invention comprises:
Adhesive strength of 7 to 7 in the measurement method according to JIS Z 0237
20N / 25mm, and the coating amount of the adhesive is 5 to 15 g /
By the m ^2, by such extrusion of adhesive from the end face with holes, adhesion of the adhesive to the punching blade, dirt indicia screen, without trouble such as sticking between the sheets, at least one on the end face It becomes a thermal transfer receiving tack sheet in which the above holes can be formed.

By using a tack sheet capable of providing punch holes as described above, filing is performed by punching holes in the sheet, and the seal is functionally stored, or the sheet is temporarily stored using a release paper portion. The seal can be stored and re-peeled to allow the seal to adhere to any article. Furthermore, the heat transfer receiving tack sheet, which has been subjected to a half cut for holes on the back surface to the release sheet or from the front surface to the heat transfer receiving sheet, has excellent runnability in the printer and is extremely practical for thermal transfer. It becomes a receiving tack sheet.

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[Procedure amendment]

[Submission date] February 27, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As the receiving sheet portion of the receiving tack sheet according to the present invention, a known heat transfer receiving sheet such as a sublimation type or a fusion type can be used. Specifically, it has a configuration in which a thermal transfer receiving layer is provided on one surface of a support. Examples of the support include a paper base such as coated paper, art paper and woodfree paper, a laminated paper obtained by laminating a resin such as polyethylene on a paper base, a film of polyester, nylon, polyolefin (for example, polypropylene) and a synthetic paper. Is done. These may be laminated in two or more layers. In the case of sublimation transfer,
(Film and synthetic paper) / (Paper base) / (Film and synthetic paper), (Film and synthetic paper) / (PET film) /
(Film or synthetic paper) is preferable because a three-layer structure such as (film or synthetic paper) can obtain a clear image and can obtain the texture of a photograph.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

The thermal transfer receiving layer is formed by applying and drying a coating liquid for forming a receiving layer according to a conventional method using a known coater such as a bar coater, a gravure coater, a comma coater, a blade coater, or an air knife coater. Can be. The coating amount of the receiving layer was 1 to 12 g / m ^{2 by} dry weight.
And more preferably 3 to 10 g / m
^{About 2} . By the way, when the thermal transfer receiving layer is less than 1 g / m ² , defects such as deterioration of an image and decrease in gloss of a printed surface may occur. The thermal transfer receiving layer is 12
If it exceeds g / m ² , the effect is saturated and not only is uneconomical, but also the print density may decrease.

Claims (4)

[Claims] 1. A thermal transfer receiving tack sheet in which an adhesive layer and a release sheet are laminated on the other side of a thermal transfer receiving sheet provided with a thermal transfer receiving layer on one side of a support, wherein the adhesive layer conforms to JIS Z 0237. Measuring method (180 ° peeling)
The receiving tack sheet for thermal transfer was formed so that the adhesive strength of the adhesive was 7 to 20 N / 25 mm and the applied amount of the adhesive was 5 to 15 g / m ^{2 in} dry weight. 2. The thermal transfer receiving tack sheet according to claim 1, wherein the thermal transfer receiving tack sheet has at least one or more holes. 3. The thermal transfer receiving tack sheet according to claim 1, wherein the thermal transfer receiving tack sheet is provided with a half cut for a hole from the back surface to the release sheet or from the front surface to the thermal transfer receiving sheet. 4. The thermal transfer receiving tack sheet according to claim 1, wherein the surface of the support on which the pressure-sensitive adhesive layer is formed is formed of a film or synthetic paper.