JPH11254841A - Manufacture of thermally transferable image receiving sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an image receiving sheet which has an image printed and is free from the generation of a curl when recording the image by thermal transfer. SOLUTION: An image is previously printed on the back face of a core layer 4 (when the core layer 4 is composed of a core base material layer and a back face side film layer, the back face of the back face side film layer) and/or the front face of a front face film layer 3 to form a printed image 5. A step to form a support 1a consisting of the core layer 4 and the front face film layer 3 by lamination and a step to form a dye staining image receiving layer 2 on the front face film layer 3, are performed in optional order to manufacture the thermally transferable image receiving sheet 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a method for producing a thermal transfer image receiving sheet (hereinafter, referred to as an image receiving sheet). More specifically, the present invention is particularly applicable to the production of an image receiving sheet having a printed front and / or back surface, such as a mark or a pattern, in which a printing method capable of preventing curling and minimizing curling can be used. The present invention relates to a method for manufacturing an image receiving sheet.

[0002]

2. Description of the Related Art In recent years, the development of a color hard copy of a thermal transfer system, in particular, a sublimation type thermal transfer printer has been developed.
In a sublimation type thermal transfer printer, an ink sheet containing a sublimable dye layer of three colors (yellow, magenta, cyan) or four colors (yellow, magenta, cyan, black) is used.
The dyes of each color are transferred to the image receiving sheet while controlling the amount of transfer by controlling the amount of transfer of each color dye, thereby forming a full-color image with excellent density gradation. It is possible. Such a thermal transfer printer is used for printing images taken by a television image or a video camera on, for example, a postcard type image receiving sheet or a sticker type image receiving sheet, such as an amusement facility such as a game center. It is also rapidly spreading at home.

In general, a detection mark, a logo mark, a design, or the like is printed on the front or back surface of an image receiving sheet according to each use. For example,
The printer as described above has a mechanism for mounting a plurality of image receiving sheets cut to a fixed size in a tray and feeding the sheet from the tray into the printer. A detection mark is printed on the back side of the image receiving sheet to determine whether it is genuine printer paper, and even if it is genuine paper, whether the front and back are reversed when the printer is installed. Is common.

In a thermal transfer printer, an image receiving layer containing a dye-dyeable resin as a main component is formed on a sheet such as a uniaxially or biaxially stretched film or a multilayer structure film (synthetic paper) in order to obtain a good print image. The formed image receiving sheet is used. The image-receiving sheet as described above has advantages such as uniform thickness, flexibility, and low thermal conductivity as compared with paper made of cellulose fiber, so that a uniform and high-density transfer image can be obtained. There is an advantage that it can be. However, when thermal transfer recording is performed on an image receiving sheet using synthetic paper or the like as a support, the stretching stress remaining in the film is released by heat, and the film shrinks thermally, resulting in curling or wrinkling of the image receiving sheet. As a result, it is difficult to smoothly travel through the printer, and there is a drawback that the commercial value of the obtained print is significantly reduced.

In order to solve the above-mentioned problems caused by the sheet-like base material of the image receiving sheet, the uniaxially or biaxially stretched film is laminated on both sides of a core material having a small heat shrinkage such as paper. Then, a method of controlling the curl caused by the base material by balancing the tension of the film on the front and back surfaces of the base material has been attempted (JP-A-3-234).
588).

However, in the conventional production of a printed image receiving sheet, printing is performed on the front or back surface of the laminated base material before the image receiving layer is formed, or printing is performed after the image receiving sheet is formed. For this reason, heating in the drying step after printing tends to cause unpredictable curl on the image receiving sheet. It is difficult to remove such curls, not only is the appearance of the product inferior, but also causes troubles such as paper jams in the image receiving sheet when recording with a printer. There has been a strong demand for solving the curling problem in the applied image receiving sheet.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a method for manufacturing an image receiving sheet which can easily control the occurrence of curling when manufacturing an image receiving sheet having a mark or pattern printed on the front or back surface. It is an object of the present invention to provide a method for producing a thermal transfer image-receiving sheet which can form a recorded image which is free from curling due to printing, has good recording running properties, and has excellent image quality. It is assumed that.

[0008]

The method (1) for producing a thermal transfer image-receiving sheet according to the present invention comprises a core material layer, a surface-side film layer laminated on the surface of the core material layer, and a film formed on the surface-side film layer. And, having an image receiving layer containing a dye-dyeable material, when producing a printed thermal transfer image receiving sheet, on the back surface of the core material layer and at least one surface of the surface side film layer in advance Printing, and then (A) laminating and integrating a surface-side film layer on the surface of the core material layer, and then forming an image-receiving layer on the surface, or (B) forming the surface-side film. An image receiving layer is formed on the surface of the substrate, and then, the back surface of the image receiving layer supporting surface side film and the surface of the core material layer are laminated and integrated. Further, the method (2) for producing a thermal transfer image-receiving sheet of the present invention comprises a core material layer including a core substrate layer, a backside film layer laminated on the backside, and a surface of the core substrate layer. The surface-side film layer laminated on, having an image-receiving layer formed on the surface of the surface-side film layer and containing a dye-dyeable material, when producing a printed thermal transfer image-receiving sheet, Printing is performed in advance on at least one of the front side of the front side film layer and the back side of the back side film layer, and then (A) the front side film layer, the core substrate layer, and the back side film layer The image-receiving layer is formed on the surface of the front-side film layer, or (B) the image-receiving layer is formed on the surface of the front-side film layer; Lamination of the back surface of the layer and the surface of the core substrate layer, and And the back surface of the base layer, in any order of lamination of the surface of the back side film layer, or is characterized in that integrating them simultaneously performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, for example, an image receiving sheet 1 obtained by an image receiving sheet manufacturing method (1) of the present invention comprises a front side film layer 3 laminated on a core material layer 4.
And the image-receiving layer 2 formed on the front-side film layer 3.
Alternatively, a print image 5 such as coke is printed on the back surface of the core layer 4. The core layer 4 may be a multilayer laminated base material, and the formula may be a single-layer body. For example, as shown in FIG.
May be a laminate in which the core substrate layer 6 and the back side film layer 7 are laminated. If necessary, a backside coating layer (not shown) may be provided on the backside of the backside film layer 7 before or after printing.

In the method (1) of the present invention, a sheet-like support 1a comprising a core material layer 4 and a surface-side film layer 3
An image receiving sheet is formed by forming an image receiving layer 2 thereon.
Before integrating these component layers, desired printing such as marks and designs is performed on the front surface of the front side film layer 3 and / or the back surface of the core material layer 4 forming the front and back surfaces of the support 1a. Next, in the laminating method (A) of the method (1) of the present invention, the back surface of the front side film 3 on which at least one desired printing is performed and the surface of the core material layer 4 are laminated and integrated.
Next, the image receiving layer 4 is formed on the film layer on the front surface side of the laminate, and the image receiving sheet 1 is manufactured. If necessary, a backside coating layer (not shown) may be formed on the backside of the core material layer 4 with or without printing on the backside at an appropriate stage.
May be formed. In FIG. 1, the surface side film layer 3
Although the printing 5 is applied to both the front surface and the back surface of the core material layer 4, it is sufficient that at least one of these is printed.

In the method (1) of the present invention, in the lamination method (B) after printing, the surface side film layer 3 (printed,
The image receiving layer 2 is formed on the surface of the core material layer 4 (printed or non-printed) on the back surface of the film layer 3 on the front side of the laminate. An image receiving sheet 1 is produced.

As shown in FIG. 2, in the method (2) for producing an image receiving sheet of the present invention, the core material layer 2 is a laminate of a core substrate layer 6 and a backside film layer 7, On this core material layer 2, a front-side film layer 3 is laminated, whereby a support 1a is formed. In the method (2) of the present invention, a desired print 5 such as a mark or a pattern is formed on at least one of the front surface of the front film layer 3 and the rear surface of the back film layer 7 before laminating and integrating the above component layers. Is done.

Next, in the laminating method (A) of the method (2) of the present invention, the front side film layer 3 and the back side film layer 7 are respectively provided on the front and back surfaces of the core substrate layer 6 in an arbitrary order, or At the same time, they are laminated and integrated, and the image receiving layer 2 is formed on the surface of the film layer 3 on the front side of the laminate.

In the laminating method (B) of the method (2) of the present invention, an image receiving layer 2 is formed on the surface of the front side film layer 3 after the printing step, and the image receiving layer 2 is supported on the front side film layer. 3 and the surface of the core substrate layer 6, and the back surface of the core substrate layer 6 and the surface of the back-side film layer 7 are laminated in any order or simultaneously and integrated.

In the above-described method, by printing a desired layer in advance before laminating the component layers, it is possible to control the occurrence of curling of the image receiving sheet very easily, and to obtain a good appearance. In addition, an image receiving sheet having excellent recording running property in a printer can be obtained. When printing is performed on a sheet-like support obtained by laminating component layers as conventionally performed generally, curling occurs due to distortion between layers generated by heating in a drying step of printing ink, To correct this curl, a further correction step is required, and the correction effect is limited. According to the method of the present invention, even if heat shrinkage or the like occurs in the front side film layer, or the back side film layer or the core material layer in the printing step, the subsequent laminating and laminating steps of each component layer, and the image receiving layer and the back side It is easily corrected during the process of forming the coating layer. Further, since the image receiving layer is formed after the printing step, the uniformity of the surface of the image receiving layer is maintained, and an image receiving sheet having excellent recording image quality can be obtained. Furthermore, for example, in the case of back side printing, transfer of the printing ink to the image receiving layer side during manufacturing is also prevented.

The method for producing a heat-transferred image-receiving sheet on which printing has been performed according to the present invention is used for printing, for example, a detection mark, a logo mark, a design, etc. on the front and back surfaces of the image-receiving sheet. The printing method is not particularly limited, and an arbitrary method can be selected. For example, intaglio printing, intaglio (gravure) printing, lithographic printing, offset printing, and the like can be mentioned. In a printing method that requires sufficient heating and drying after printing, the curl prevention effect of the method of the present invention is remarkable. There is no particular limitation on the ink used for printing. For example, vehicles (coloring materials) composed of colorants such as dyes and pigments, vegetable oils, mineral oils, solvents, natural resins, synthetic resins, waxes, etc., and the flow of the inks A general ink comprising an auxiliary agent for controlling the properties, drying properties, color tone, gloss and the like can be used. Also, as for the color of the ink, for example, from among the basic colors of the ink, such as black, indigo, red, yellow, etc.,
It is appropriately selected according to the purpose and used alone or in combination.

The core layer forming the sheet-like support used in the present invention may be a paper base such as woodfree paper, coated paper, art paper, or a laminated paper obtained by laminating a thermoplastic resin such as polyethylene on a paper base. And a plastic film such as a film made of polyester such as polyethylene phthalate, a nylon film, a polyolefin (for example, polypropylene) film, or a multilayer structure having a polyolefin resin and an inorganic pigment as main components and having a large number of voids formed by biaxial stretching. Can be exemplified.

In addition to using the above-mentioned sheet support alone, two or more of the above-mentioned sheet supports may be laminated by a known method such as a dry laminating method, a wet laminating method or a melt laminating method. Structural sheets can also be used as a support, and the combination is not limited. Generally, a dry lamination method is preferably performed, and as the adhesive used at that time, a polyether-based or polyester-based polymer resin component, and a polyisocyanate-based or epoxy-based curing agent may be used. . Also, in the lamination of the core substrate layer and the front and back side film layers, it is possible to laminate by the same method.

In the present invention, as the core material layer forming the sheet-like support, a paper base made of natural pulp containing wood pulp as a main component is preferably used. Such a paper substrate has appropriate heat insulating properties and cushioning properties, and is also advantageous in cost. As the paper base material, a material which has been subjected to a calendering treatment and has been highly smoothed is preferably used, and may have a coating layer containing a pigment, if necessary. For example, high quality paper, coated paper, art paper, matte paper, impregnated paper, paperboard, laminated paper, etc. can be used as the paper base material.

Examples of the paper base material include wood pulp such as hardwood pulp, softwood pulp, hardwood / softwood mixed pulp and the like, and pulp usually used such as kraft pulp, sulfite pulp, soda pulp and the like. Base paper can be used. The base paper is preferably one whose surface smoothness has been improved by calender treatment or the like, and its basis weight is preferably 50 to 250 g / m ² . Furthermore, the back side or both surfaces of the paper base material may be coated with a water-resistant, thermoplastic resin (so-called laminated paper), and as such a water-resistant thermoplastic resin, for example, a polyolefin resin can be used. . The polyolefin resin is selected from a homopolymer of ethylene and α-olefins, for example, propylene, and at least two copolymers of the olefin, and these various polymers may be used alone. May be used in combination of two or more thereof.

The base paper is made of various conventional paper additives such as a dry paper strength enhancer (cationized starch, cationized polyacrylamide, etc.), a sizing agent (fatty acid salt, rosin, maleated rosin, cationized sizing agent, Reactive sizing agent, etc.), filler (clay, kaolin, titanium, etc.), wet paper strength enhancer (melamine resin, epoxidized polyamide resin, etc.), fixing agent (aluminum sulfate, cationized starch, etc.), PH regulator (caustic soda) , Sodium carbonate, etc.). The base paper is made of water-soluble polymer additives, sizing agents, inorganic electrolytes, hygroscopic substances, pigments,
It may be tab-sized or size-pressed with a treatment liquid containing one or more dyes, pH adjusters, and the like.

In the method of the present invention, the surface-side film layer to be laminated on the core material layer includes polyolefins such as polyethylene and polypropylene from the viewpoint of uniformity of image quality and gradation obtained when printed. A film base material containing one or more of polyesters such as polyethylene terephthalate, polyamides, polyvinyl chloride, and polystyrene as main components is used. Preferably, synthetic paper made of a multilayered stretched film mainly containing a thermoplastic resin is used. The multilayer structure stretched film can include a back surface layer and the like in addition to the surface layer and the core layer.

As an example of synthetic paper, an inorganic fine powder is
A polyolefin biaxially stretched film containing ４５45% by weight was used as a core layer, and the surface of the core layer was coated with inorganic fine powder of 0 to 1%.
A synthetic resin film having a multilayer structure in which a biaxially stretched polyolefin film containing 0% by weight is provided with a thickness of 0.3 to 1.5 μm as an outermost surface layer. Further, a biaxially oriented polyolefin film layer may be laminated on the back side of the core layer. Synthetic paper consisting of this multilayer resin stretched film, extruding the composition for the core layer into a sheet,
A multilayer resin sheet obtained by laminating the surface layer composition on one or both surfaces of the sheet is simultaneously or sequentially heated at a temperature lower than the melting point of the polyolefin in the longitudinal direction and the transverse direction by 4 to 1 respectively.
By stretching twice, a large number of microvoids are generated in the core layer, and a stretched film having good compressibility and flat surface and backside layers can be obtained.

The thickness of the entire front-side film layer is 5 to 20.
It is preferably 0 μm, for example, in the case of synthetic paper, the thickness of each layer of the front layer, the back layer and the core layer, the total thickness of the front layer and the back layer is the total thickness of the multilayer structure resin film Preferably, the thickness is 10 to 40% and the thickness of the core layer is 90 to 60%. If the thickness of the surface layer and the back surface layer is too thick, the compression properties of the core layer cannot be fully utilized, and if it is too thin, the surface smoothness decreases, and the adhesion between the head and the image receiving sheet becomes poor. Tends to be unstable.

The thickness of the sheet-like support formed by laminating the core material layer and the surface-side film layer is preferably in the range of 20 to 300 μm. When the thickness of the support is less than 20 μm, not only the mechanical strength of the obtained image receiving sheet becomes insufficient, but also the hardness and repulsion force against deformation become insufficient, and the image receiving sheet produced at the time of printing becomes insufficient. In some cases, inconvenience such as insufficient prevention of curling may occur.
If the thickness exceeds 300 μm, the thickness of the obtained image receiving sheet may be excessive. In a printer having a predetermined volume, there is a limit to the volume that can accommodate the image receiving sheet, and an increase in the thickness of the image receiving sheet naturally causes a decrease in the number of image receiving sheets built in the printer. In this case, in order to accommodate a predetermined number of image receiving sheets, the volume of the printer must be increased, and in this case, it is difficult to make the printer compact.

In the method of the present invention, the core material layer may be composed of a plurality of component layers, for example, it may have a configuration in which a backside film layer is laminated on the backside of the core substrate layer. . As the back side film layer, the same film base as the above-described front side film layer is used.

In the image receiving sheet of the present invention, the image receiving layer provided on the surface of the sheet-like support is formed mainly of a dyeing resin capable of dyeing and fixing a sublimable dye transferred from an ink ribbon. You. As such a dyeing resin, for example, a cellulose resin such as a polyester resin, a vinyl chloride-vinyl acetate copolymer resin, a polycarbonate resin, and an acetate butyrate resin can be used. The coating amount of the image receiving layer is adjusted within the range of 1 to ²⁰ g / m ² , preferably 3 to 10 g / m ² . When the coating amount of the image receiving layer is less than 1 g / m ² , the image receiving layer cannot completely cover the surface of the support. They may adhere, and so-called fusion may occur. On the other hand, when the coating amount of the image receiving layer exceeds 20 g / m ² ,
Not only is the image receiving effect saturated and uneconomical, but also the strength of the image receiving layer becomes insufficient and the thickness of the image receiving layer becomes excessive, so that the heat insulating effect of the support is not sufficiently exhibited, and the image density decreases. May be.

In order to prevent the image receiving layer of the image receiving sheet obtained by the method of the present invention from fusing between the image receiving layer and the ink ribbon due to the heating of the thermal head, a fusion preventing agent such as a crosslinking agent for resin, a lubricant or a release agent is used. Agents may be added. If necessary, other additives such as a colored pigment, a colored dye, a fluorescent dye, a plasticizer, an antioxidant, a pigment, and an ultraviolet absorber may be added. Acrylic silicone resins and the like are used as anti-fusing agents, isocyanate compounds and epoxy compounds are used as crosslinking agents, and benzotriazole, benzophenone, phenylsalicylate and cyanoacrylate compounds are used as ultraviolet absorbers. It is desirable that the components added to the image receiving layer cause a crosslinking reaction via a crosslinking agent. These additives may be mixed with the main component of the image receiving layer and applied, or may be applied as a separate coating layer above or below the image receiving layer.

In the image receiving sheet obtained by the method of the present invention, the running properties are improved, static electricity is prevented, the image receiving layer is prevented from being damaged by rubbing between the receiving sheets, and further, when the printed image receiving sheets are placed one upon another, contact,
Back side of image receiving sheet (opposite to image receiving layer) for the purpose of preventing transfer of dye to the back side of adjacent image receiving sheet
In addition, a back coating layer may be formed. The back coating layer contains a resin effective as an adhesive, and this resin is also effective for the running property of the image receiving sheet and for preventing the image receiving layer surface from being damaged. Such adhesive resins include acrylic resin, epoxy resin, polyester resin,
Phenol resins, alkyd resins, urethane resins, melamine resins, and the like, and reaction cured products of these resins can be used.

Further, the back coating layer may contain an antistatic agent for the purpose of suppressing paper feeding, running trouble, and the like due to electrostatic charging. As the antistatic agent, commercially available anionic, nonionic, cationic or other antistatic agents can be used, and fine powder of an inorganic oxide such as titanium dioxide or zinc oxide is mixed with impurities and calcined, Inorganic fine powder having enhanced electron conductivity can also be used. Among them, it is desirable to use a cationic polymer, and polyethyleneimine, an acrylic polymer containing a cationic monomer, a cation-modified acrylamide polymer, and a cationic starch are preferably used.

Further, the back coating layer may contain an adhesive, a lubricant, a pigment, an antifoaming agent, a dispersing agent, a resin crosslinking agent, a colored dye, and the like, as necessary. The coating amount of the back coating layer is not particularly limited, but is 0.3 to 20 g / m ^2.
And more preferably 0.5 to 10 g
/ M ² . If the coating amount of the back coating amount is too small, the effect expected for the coating layer is not exhibited,
If the amount is too large, the effect is saturated and the cost is increased, so that it is not practical.

Further, when the image receiving sheet travels in the printer, in order to prevent the occurrence of traveling trouble due to static electricity,
An antistatic agent layer different from the backside coating layer may be applied on the image receiving layer surface of the image receiving sheet or between the image receiving layer and the sheet-like support.

In the method of the present invention, the image-receiving layer, the backside coating layer, and the other coating layers of the image-receiving sheet are coated with a coating solution for each layer by using a bar coater, a gravure coater, a comma coater, a blade coater, an air knife coater, and the like. It can be formed by coating with a known coater such as a gate roll coater and drying.

[0034]

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

Example 1 [Formation of Receptive Layer on Surface-Side Film] A biaxially stretched, 60 μm-thick multilayer structure film (trade name: Yupo FPG) containing a polyolefin containing an inorganic pigment as a main component.
No. 60, manufactured by Oji Yuka Synthetic Paper, heat-treated at 80 ° C. for 24 hours), and coated on the surface of the surface-side film with paint-1 having the following composition so that the solid content is 8 g / m ^2. Coating and drying were performed with a coater to form an image receiving layer. [Printing on Back Side Film] Back side made of a biaxially stretched 60 μm thick multilayer structure film (trade name: Yupo FPG60, manufactured by Oji Yuka Synthetic Paper, no heat treatment) containing a polyolefin containing an inorganic pigment as a main component On the back side of the film, using a gravure printing machine, printing speed 60m / min
The logo was printed under the conditions of a drying temperature of 130 to prepare a printed backside film. [Production of Image Receiving Sheet] A 50 μm-thick polyethylene terephthalate (a film having a receiving layer provided thereon) and a printed rear surface film being provided with the image receiving layer surface and the printed surface facing outward, respectively. An image receiving sheet was produced by laminating on the front and back surfaces of a core substrate made of a (PET) film by a dry lamination method using a polyester-based adhesive.

Paint-1 (Coating solution for receiving layer) Component amount 100 parts polyester resin (trademark: Byron 200, manufactured by Toyobo) Silicone oil (trademark: KF393, manufactured by Shin-Etsu Silicone Co.) 3 parts Isocyanate (trademark: Takenate D-) 140N, manufactured by Takeda Pharmaceutical) 5 parts Toluene 300 parts

Example 2 In the same manner as in Example 1, except that the core substrate had a thickness of 80
An image receiving sheet was prepared using μm coated paper (trademark: OK coated, manufactured by Oji Paper).

[0038]Example 3 High-density polyethylene on the surface of high-quality paper with a thickness of 100 μm
At a temperature of 320 ° C. to a thickness of 30 μm.
And press it onto a cooling roll with a temperature of 20 ° C.
And fix it by cooling to form a coat layer and laminate paper.
Produced. The following composition on the coating layer of this laminated paper layer
Paint-2 with a solids coating amount of 2 g / m ^TwoSo that
Coating and drying to form a back coating layer, and a core material layer
Was. In the same manner as in Example 1 on the back surface coating layer of this core material layer
Printed. Example 1 on the non-laminated surface of the core material layer
Use the same front side film with an image receiving layer as
Using a polyester adhesive so that it is on the side
The image receiving sheet is made by laminating by dry lamination.
Made.

The coating 2 (back surface coating layer coating solution) Ingredient Amount acrylate copolymer (trademark: Primer Le WL-81, Rohm & Haas Co.) 100 parts Epoxy resin (Trademark: Epokoto DX-225, 5 parts Conductive agent (trade name: Saftomer ST1000, manufactured by Mitsubishi Yuka) 50 parts Denatured ethanol 1420 parts

Comparative Example 1 [Formation of a sheet-like support] A biaxially stretched, 60 μm thick multilayer structure film (trade name: Yupo FPG60, manufactured by Oji Yuka Synthetic Paper) containing a polyolefin containing an inorganic pigment as a main component was prepared. Prepare a heat-treated product (80 ° C, 24 hours) and a non-heat-treated product, and prepare a 50 μm polyethylene terephthalate (P
ET) The heat-treated product is on the front side and the untreated product is on the back surface, and the sheet-like support is laminated by a dry lamination method using a polyester-based adhesive on both sides of the core substrate made of a film. Produced. On the surface of this support,
An image receiving layer was formed in the same manner as in Example 1 to produce an image receiving sheet. [Printing on Image Receiving Sheet] Next, printing was performed in the same manner as in Example 1 on the back side of the image receiving sheet (the back side of the unheated film).

Comparative Example 2 In the same manner as in Comparative Example 1, except that the thickness of the core substrate was 5
An image receiving sheet was prepared using 80 μm-thick coated paper (trademark: OK Coat, manufactured by Oji Paper) instead of the 0 μm polyethylene terephthalate (PET) film.
Printed.

Tests and Evaluations The image receiving sheets obtained in the above Examples and Comparative Examples were tested by the following methods. Table 1 shows the obtained results. [Curl evaluation] The obtained image receiving sheet was cut into A5 size, placed on a horizontal desk with the image receiving layer side up, and placed at 20 ° C.
The curl when left for 24 hours in an environment of 65% RH was measured. The degree of curling was measured by measuring the lifting height of the four corners when left standing with the concave side facing up, and expressed as an average value (mm). When the image receiving layer side has a concave shape (+), and when it has a convex shape (-). In general, when the curl amount is large, running troubles easily occur in the printer, and thus the commercial value is reduced.

[Image Uniformity] An ink layer containing a sublimable dye together with a binder is provided on a polyester film having a thickness of 6 μm, and ink sheets of three colors of yellow, magenta and cyan are brought into contact with the image receiving layer of the image receiving sheet. And a commercial thermal transfer video printer (trademark: VY-50,
Using a method of thermally transferring a predetermined image onto the image receiving layer by stepwise heating with a thermal head using Hitachi Ltd.), the above-described halftone single color and color superimposed images of each color were printed. Using a Macbeth reflection densitometer RD-914 (trademark), the reflection density was measured for each applied energy with respect to the recorded image transferred on the image receiving sheet.
With respect to the uniformity of the recorded image in the gradation portion where the optical density (black) is equal to 1.0, (1) presence / absence of density unevenness and (2) presence / absence of white spots were visually observed. the above,
The evaluation results were rated 5 for excellent, 4 for good, 3 for normal, 2 for slightly defective, and 1 for markedly defective.

[Evaluation of Transportability] The transportability of the image receiving sheet during recording was evaluated by using the above-mentioned thermal transfer video printer.
00 sheets were continuously printed, and those which were practically suitable without transport trouble were indicated by (○), and those which were not practical due to transport trouble were indicated by (x). Table 1 shows the results of the above test.

[0045]

[Table 1]

[0046]

According to the method of the present invention, in the case of manufacturing an image receiving sheet on which a mark or a pattern is printed on the image receiving surface and / or the back surface, the curl can be easily controlled, and the recording traveling property is improved. It is possible to provide an image receiving sheet having excellent image quality and greatly contribute to the industrial world.

[Brief description of the drawings]

FIG. 1 is a process explanatory view of one embodiment of a method for manufacturing an image receiving sheet according to the present invention.

FIG. 2 is a process explanatory view of another embodiment of the method for producing an image receiving sheet according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Image receiving sheet with printing 2 ... Image receiving layer 3 ... Front side film layer 4 ... Core material layer 5 ... Printed image 6 ... Center core base material layer 7 ... Back side film layer 1a ... Support

Claims (2)

[Claims] 1. A core material layer, a surface-side film layer laminated on the surface thereof, and formed on the surface-side film layer,
An image-receiving layer containing a dye-dyeable material, and when producing a printed thermal transfer image-receiving sheet, printing is performed in advance on at least one of the back surface of the core material layer and the surface of the front-side film layer. And (A) laminating and integrating a surface-side film layer on the surface of the core material layer, and then forming an image-receiving layer on the surface, or (B) a surface of the surface-side film. A method for producing a thermal transfer image-receiving sheet, comprising: forming an image-receiving layer thereon; and then laminating and integrating the back surface of the image-receiving layer supporting surface side film and the surface of the core material layer. 2. A core material layer including a core substrate layer and a backside film layer laminated on a back surface thereof, and a front side film layer laminated on a surface of the core substrate layer. An image receiving layer containing a dye-dyeable material is formed on the surface of the front-side film layer, and when manufacturing a printed thermal transfer image-receiving sheet, the front side and the back side of the front-side film layer Printing on at least one surface of the back surface of the film layer in advance, and then: (A) laminating the front side film layer, the core substrate layer, and the back side film layer integrally, Or (B) the image receiving layer is formed on the surface of the front side film layer, and the back surface of the image receiving layer supporting front side film layer and the core substrate layer And the back surface of the core substrate layer, and the back surface side fill A method for producing a thermal transfer image-receiving sheet, comprising laminating a heat transfer layer on a surface of a thermal transfer layer in any order or simultaneously and integrating them.