JP3057926B2 - Sublimation dye thermal transfer image receiving sheet manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a thermal transfer sublimable dye image-receiving sheet for a printer, which transfers a sublimable dye by heat to form a dyed image. More specifically, the present invention provides a sublimable dye on at least one surface of a paper, a synthetic paper, a plastic film, or a sheet-like support (hereinafter simply referred to as a substrate) obtained by appropriately laminating and bonding these. Sublimable dye thermal transfer image-receiving sheet having a coating layer containing a dyeable resin as a main component and containing an isocyanate compound (hereinafter, simply referred to as an image receiving layer), has a stable print density, and has no abnormal transfer with an ink ribbon. (Hereinafter, simply referred to as an image receiving sheet).

[0002]

2. Description of the Related Art Recently, a thermal printer, particularly a dye thermal transfer printer capable of printing a clear full-color image, has attracted attention. The dye thermal transfer printer superimposes the image receiving layer surface of the image receiving sheet on the sublimation dye ink ribbon,
The heat is supplied from a thermal head or the like to transfer the dye at a required portion of the sublimation dye layer to a required density on the image receiving layer to form an image.

In order to form a high-quality image on an image receiving sheet at high speed by using such a thermal printer,
It is necessary to provide an image receiving layer on a substrate. As the base material, paper such as coated paper and art paper and various films are used. In particular, a biaxially stretched film containing a thermoplastic resin such as polyolefin as a main component and containing voids (voids) is used. A substrate known as paper is used. The image receiving sheet using the synthetic paper as a base material has an advantage that a uniform and high-density print can be obtained due to advantages such as a relatively uniform thickness, flexibility, and low thermal conductivity.

However, an image receiving sheet made of synthetic paper as a base material causes curling or wrinkling due to heat of a thermal head during a printing operation, which causes trouble in running and significantly reduces the commercial value of the obtained print. There were problems such as lowering. This is because the stretching strain in the synthetic paper is released by heat and shrinks.

In order to solve the above-mentioned problems, it is necessary to laminate the above-mentioned synthetic paper on both sides of a sheet having a very small heat shrinkage, for example, paper or a plastic film such as PET, to form a base material. Proposed. In particular, in the case of a printer having a large amount of heat, some measures have been taken such as using synthetic paper having a small heat shrinkage on the side where the image receiving layer is formed, or synthetic paper having a relatively large heat shrinkage on the opposite side via a core material. Was.

The material constituting the image receiving layer can hold an image dyed by a dye from an ink ribbon,
In addition, the main component is a resin which is easy to dye a sublimable dye, and an anti-fusing agent, a dye, a pigment and the like are blended as necessary. The image receiving layer is blended with an anti-fusing agent in order to prevent block transfer (hereinafter, referred to as abnormal transfer) with the binder of the ink ribbon. Anti-fusing agents include various types of surfactants, release agents such as silicones, cross-linking agents such as isocyanates, and the like. Coated as a layer. Conventional techniques for adding an anti-fusing agent such as a surfactant, a release agent and a crosslinking agent to an image receiving layer are disclosed in JP-A-60-34898, JP-A-61-27290 and JP-A-61-199997. And the production method is disclosed in
No. 3-262285, and U.S. Pat. No. 4,927,666.
No. are known.

However, simply adding an anti-fusing agent to the image-receiving layer cannot sufficiently prevent abnormal transfer, and after coating and drying, at 60 ° C. for 10 days or more, or 1 day.
It is necessary to perform re-drying at 00 ° C. for 10 minutes or more, or at 120 ° C. for 2 minutes or more, and thus requires long-time or high-temperature heating. Prolonged and / or high temperature heat treatments limit the types of materials used in making the image receiving sheet. In order to heat-treat industrially for 10 days or more, the image receiving sheet is generally rolled. However, when a rigid base material is heated in a roll state for a long time, curling due to curling occurs, and in order to prevent the curling, it is extremely troublesome to change the winding midway. Was. The high-temperature heating is performed, for example, when a photographic printing paper support in which the front and back of high-quality paper are laminated with polyethylene is used as a base material, the melting point of the polyethylene resin is 110 ° C to 130 ° C.
Therefore, when dried once, at a high temperature of 100 ° C. or more for several minutes, the polyethylene foamed and markedly impaired the commercial value of the image receiving sheet. In addition, when a dyeable resin having a low glass transition point is heat-treated at 60 ° C. or higher, there is a problem that blocking occurs.

The above-mentioned heat treatment aims at preventing the abnormal transfer during printing and stabilizing the print density by improving the heat resistance by crosslinking the dye-dyeable resin. Therefore, if the temperature applied to the roll during heat treatment is unstable, or if the heating temperature varies depending on the location of the roll,
Prevention of abnormal transfer within a single roll and variations in print density and the like caused variations in the quality, making it difficult to ensure stable quality.
For this reason, there has been a long-awaited need to provide a new method for producing a dye thermal transfer image-receiving sheet which has no limitation on the material used, can prevent abnormal transfer, and has stable quality such as print density.

[0009]

SUMMARY OF THE INVENTION According to the present invention, there is provided a printing method which is free from abnormal transfer with an ink ribbon and has a stable print density.
An object of the present invention is to provide a method for producing an image receiving sheet used in a sublimation dye thermal transfer recording system. In particular, it does not require long-time, and / or high-temperature heating, and therefore does not cause curling failure due to winding. An object of the present invention is to provide a method for producing a stable and uniform quality sublimable dye thermal transfer image-receiving sheet that can use a substrate having low heat resistance.

[0010]

According to the present invention, there is provided a method for producing a thermal transfer image-receiving sheet for a sublimable dye, comprising the steps of: selecting a polyester resin, a polycarbonate resin, a vinyl chloride copolymer resin and a cellulose derivative on the surface of a sheet-like support. Containing a dried sublimable dye-dyeable resin as a main component, and isocyanate-containing coating solution, and dried to form a sublimable dye-dyeable image-receiving layer. It is wound up into a roll having a diameter of 900 mm or less, and the roll of the wound-up coated sheet is wrapped in a moisture-proof package.
The heat treatment is performed at a temperature of 75 ° C. and a relative humidity of 75% or less. The sublimable dye thermal transfer image-receiving sheet manufactured by the method of the present invention can stabilize the print density and prevent abnormal transfer with the ink ribbon.

[0011]

As shown in FIG. 1, the image receiving sheet 1 of the present invention
At least a sheet-like support 2 and an image receiving layer 3 on its surface for receiving a dye and forming a print image are provided. Further, as shown in FIG. 2, a back cover layer 4 may be formed on a surface of the sheet-like support 2 opposite to the image receiving layer 3.

Examples of the sheet-like support used in the present invention include high quality paper, medium quality paper, Japanese paper, thin paper, linter pulp-containing paper, coated paper (including finely coated paper, lightweight coated paper, art paper, etc.) and the like. Paper base material, polyester, polyolefin, synthetic resin film such as nylon, or a polyolefin resin and inorganic pigment as a main component, biaxially stretched, a multilayer structure film having voids, etc., and these paper base materials, A composite sheet obtained by laminating and laminating a multilayer structure film on the front and back surfaces of a synthetic resin film as a core material or laminating a synthetic resin is exemplified.

The image receiving layer used in the present invention contains, as a main component, a dye-dyeable resin capable of dyeing a sublimable dye transferred from an ink ribbon. Such a sublimable dye-dyeable resin is a polyester resin, a polycarbonate resin,
It is selected from a vinyl chloride copolymer resin and a cellulose derivative. The thickness of the image receiving layer is preferably from 1 to 10 μm, more preferably from 2 to 7 μm. If the thickness of the image receiving layer is 1 μm or less, problems such as a decrease in the density of the printed image or a decrease in the gloss of the printed surface due to heat occur.
When the thickness exceeds 10 μm, the strength of the image receiving layer decreases.

To the image receiving layer of the present invention, a crosslinking agent for a resin or a release agent is added as necessary for the purpose of preventing abnormal transfer to the ink ribbon due to heat during printing. In the present invention, a crosslinking agent is used. The crosslinking agent that can be used in the present invention is an isocyanate compound, and is appropriately selected according to the type of the dyeing resin and other additives. When an isocyanate compound is used, its NCO group reacts with the polyol of the dyeing resin to crosslink it and improve the heat resistance of the image receiving layer. In order to industrially prevent abnormal transfer between the image receiving layer and the ink ribbon, it is preferable to add an isocyanate compound in an amount of 2 to 3 times the theoretical amount. Even when a stoichiometric amount of an isocyanate compound is added, the effect of preventing abnormal transfer may be unstable. On the other hand, if the addition amount is too large, it is not only uneconomical, but also the ratio of the dyeable resin in the image receiving layer decreases, which may lead to a decrease in print density.

A releasing agent may be added to the image receiving layer in order to improve the slipperiness of the image receiving layer. As the release agent, it is preferable to use a surfactant having an OH group or silicone oil. The addition amount is preferably 1 part to 10 parts with respect to 100 parts by weight of the dyeing resin. If the addition amount is too small, the releasing effect is insufficient, and if it is too large, the print density is reduced and repelling may occur at the time of coating the image receiving layer.

In addition to the above, a color pigment, a fluorescent pigment, a color dye, an ultraviolet absorber, and an antioxidant may be added to the image receiving layer of the present invention, if necessary.

In the method of the present invention, after coating and drying the image receiving layer, the coated sheet is wound into a roll having a diameter of 900 mm or less. The coating roll is immediately subjected to moisture-proof packaging, and is subjected to heat treatment in an environment where the temperature and humidity are sufficiently controlled. The heat treatment temperature is 30 ° C to 60 ° C, and the relative humidity is 75% or less. When the heating temperature is 30 ° C. or lower, the time required to completely prevent abnormal transfer of the obtained image receiving sheet becomes extremely long. Further, the production method of the present invention is different from the methods of JP-A-63-262285 and U.S. Pat. No. 4,927,666, in that the purpose is to lower the residual solvent and to lift the release agent to the surface of the image receiving layer. Therefore, temperatures above 60 ° C. are not required.
On the contrary, if the temperature exceeds 60 ° C., blocking may occur during heating when a dyeing resin having a low glass transition point is used. The sheet may be thermally deformed and cause curl, and the range of materials that can be used for the image receiving layer and the sheet-like support is limited.

The temperature and relative humidity of the environment in which the heat treatment is performed are sufficiently controlled. Industrially, heating several tens of rolls at the same time requires a large-scale drying chamber, but the larger the drying chamber, the greater the variation in temperature distribution. If the variation of the heating temperature is large, the quality such as abnormal transfer prevention performance and print density becomes unstable. Therefore, it is preferable that the room temperature distribution be controlled within ± 5 ° C. with respect to the set value. In particular, if the variation in the heating temperature exceeds 10 ° C., the print density will vary significantly. The heating time is preferably completed within 2 to 5 days. It takes some time for the temperature of the roll to become the same as the temperature of the atmosphere. If the heating time is too short, abnormal transfer with the ink ribbon occurs or the print density becomes unstable. On the other hand, if the heating time is too long, there is a problem that crosslinking is excessively caused to cause a decrease in print density or curl of the image receiving sheet.

In the heat treatment in a roll state, the winding diameter of the roll and the arrangement of the rolls in the drying chamber are extremely important in minimizing the errors in the above-mentioned heating temperature, heating environment and heating time. The method for manufacturing an image receiving sheet according to the present invention is characterized in that the diameter of the roll is regulated to 900 mm or less. It takes some time for the temperature of the roll to become the same as the temperature of the atmosphere, but the roll core takes longer than the outermost part. This difference is more remarkable as the roll winding diameter is larger. Even if the environment for the heat treatment is controlled to ± 5 ° C, if the actual temperature applied to the roll differs at the roll part, it will lead to the prevention of abnormal transfer, the variation in quality such as print density, and the commercial value of the image receiving sheet. It is an important factor that influences. When the roll winding diameter is 900 mm or less, the temperature difference between the outermost part and the core part can be controlled within 10 ° C.

In the method for producing an image receiving sheet of the present invention,
The effect of relative humidity is smaller than temperature but an important requirement. The heat treatment of the method of the present invention is generally performed in an environment having a relative humidity of 75% or less, preferably 10% to 75%. Since the isocyanate compound is used as a cross-linking agent, it is necessary to prevent the isocyanate compound from reacting with water in the air to be deactivated at a relative humidity higher than 75%. Immediately after winding, it is moisture-proof packed and heat-treated in the above relative humidity environment.

In the image receiving sheet of the present invention, a back cover layer is formed on the opposite side of the substrate on which the image receiving layer is provided, for the purpose of preventing runnability, preventing static electricity, and preventing blocking with the image receiving layer during heating. Is also good. The back cover layer generally contains a release agent to prevent blocking with the image receiving layer.
As the release agent, various release agents of silicone type, fluorine type, phosphate ester type, fatty acid ester type and alcohol type can be used. An organic resin as a binder and various conductive agents for antistatic treatment can be added to the back coating layer in addition to the release agent. As the conductive agent, a cationic polymer is preferable.

The compounding ratio of each component constituting these back coating layers is such that 100 parts by weight of the organic resin and 3-10
Preferably, the amount is 0 parts by weight and the conductive agent is 20 to 150 parts by weight. If the amount of the release agent is less than 3 parts by weight, blocking cannot be sufficiently prevented, and if it exceeds 100 parts by weight, the effect is saturated and uneconomical. When the amount of the conductive agent is less than 20 parts by weight, sufficient static electricity cannot be prevented, and when the amount exceeds 150 parts by weight, the effect is saturated and uneconomical. The coating amount of the back cover layer is formed in the range of 0.3 to 1.5 g / m ² . If the coating amount is less than 0.3 g / m ² , the prevention of blocking and the prevention of static electricity are insufficient, and if it exceeds 1.5 g / m ² , the effect is saturated and uneconomical.

In the method for producing an image-receiving sheet of the present invention, if necessary, another layer may be provided between the sheet-like support and the image-receiving layer as a cushioning agent for preventing the image-receiving layer from being charged or increasing the image density. be able to.

In the production method of the present invention, the image receiving layer and other coating layers are formed by coating and drying with a coater such as a bar coater, a gravure coater, a comma coater, a blade coater, an air knife coater, and a gate roll coater. can do.

[0025]

The present invention will be further described with reference to examples. The department is
Unless otherwise specified, solid parts by weight.

Example 1 Polyethylene terephthalate (PET) having a thickness of 38 μm
On the front and back of the film, a biaxially stretched 50 μm and 60 μm thick multilayer structure film (trade name: YUPO FPG50, containing a polyolefin containing an inorganic pigment as a main component)
FPG60, manufactured by Oji Yuka Synthetic Paper Co., Ltd.) was bonded by a dry lamination method using a polyester-based adhesive to prepare a sheet-like support. To form an image receiving layer on the 50 μm thick multilayer structure film side of this sheet-like support,
Paint-1 having the following composition was applied by a die coating method at a solid content of 5 g / m ² and dried. After drying, the image receiving sheet was wound into a roll, immediately wrapped in moisture proof, and left in a heat treatment room for 5 days. The temperature in the heat treatment chamber was 35 ° C ±
At 3 ° C., the relative humidity was controlled at 35 ± 5% RH. The roll diameter of the image receiving sheet roll was 700 mm, and the roll was arranged horizontally so as not to contact the floor surface or the like.

The paint -1 Ingredient weight saturated polyester resin (trademark: KA1051, Arakawa Chemical Industries, Ltd., 100 parts of glass transition point 50 ° C.) the silicone resin (trademark: SH3746, manufactured by Toray Dow Corning 5 parts Silicone Co. ) Isocyanate crosslinking agent (trade name: Takenate D-110N, 5 parts, manufactured by Takeda Pharmaceutical Co., Ltd.) The mixture having the above composition was dissolved in a mixed solvent of toluene: MEK = 5: 1 to obtain a 15% solution.

Example 2 An image receiving sheet was prepared and heat-treated in the same manner as in Example 1. However, as the paint for forming the image receiving layer, a paint having the following composition-
2 was used. After drying, wind the image receiving sheet into a roll,
This was immediately moisture-proof packed and left in the heat treatment room for 2 days. The temperature in the heat treatment chamber was controlled at 50 ° C. ± 3 ° C., and the humidity was controlled at 35 ± 5% RH. The winding diameter of the image receiving sheet roll was 700 mm. This roll was placed horizontally so as not to contact the floor or the like.

[0029] Paint -2 Ingredient weight saturated polyester resin (trademark: Byron 290, Toyo肪Co., 100 parts of glass transition point 77 ° C.) the silicone resin (trademark: SH3746, manufactured by Toray Dow Corning 5 parts Silicone Co. ) Isocyanate crosslinking agent (trade name: Takenate D-110N, 5 parts, manufactured by Takeda Pharmaceutical Co., Ltd.) This mixture was dissolved in a mixed solvent of toluene: methyl ethyl ketone = 5: 1 to obtain a 15% solution.

Example 3 An image receiving sheet was prepared and heat-treated in the same manner as in Example 1. However, on the surface of the sheet-like support opposite to the surface on which the receiving layer was formed, a back coating layer was formed of a paint-3 having the following composition.
By a bar coating method at a solid content of 1 g / m ² ,
Thus, an image receiving sheet was obtained. After drying, the image receiving sheet was wound up into a roll, immediately wrapped in a moisture-proof package, and left in a heat treatment chamber for 2 days. The temperature of the heat treatment chamber was 50 ° C ± 3.
C. and the humidity was controlled at 35 ± 5% RH. The winding diameter of the image receiving sheet roll was 700 mm.

The paint -3 Ingredient weight fluorine-containing acrylic resin (trademark: Modiper F250, 100 parts (manufactured by Nippon Oil & Fats Co., Ltd.)) conductive agent: modified (TM Safutoma ST1000, manufactured by Mitsubishi Petrochemical Co., Ltd.) 50 parts The mixture It was dissolved in ethanol to make a 10% solution.

Example 4 A high quality paper having a basis weight of 170 g / m ² , a surface (felt surface) Beck smoothness (according to JIS P8119) of 190 seconds, and an opposite surface (wire surface) Beck smoothness of 200 seconds was used as a sheet-like support. It was used as a core material. A polyethylene resin containing 10% by weight of titanium dioxide is melt-extruded and laminated on the surface (felt surface) of the core material to form a surface layer of 30 g / m ² , and on the opposite surface (wire surface) To 10
A polyethylene resin containing titanium dioxide by weight was melt-extruded and laminated to form a back surface layer of 28 g / m ² to form a sheet-like support. On the support, on the side of the surface layer, the same paint-2 as in Example 2 for forming an image receiving layer,
Coating and drying were performed by a die coating method at a solid content of 5 g / m ² . Immediately after drying, the image receiving sheet was wound up in a roll shape, wrapped in a moisture-proof package, and left in a heat treatment chamber for 2 days. The temperature in the heat treatment chamber was controlled at 50 ° C. ± 3 ° C., and the humidity was controlled at 35 ± 5% RH. The winding diameter of the image receiving sheet roll was 700 mm.

Comparative Example 1 An image receiving sheet was produced in the same manner as in Example 2. However, no heat treatment was performed.

Comparative Example 2 An image receiving sheet was produced in the same manner as in Example 2. However, after the image receiving layer was formed, the image receiving sheet was cut into sheets and subjected to a heat treatment at a temperature of 120 ° C. for 3 minutes.

Comparative Example 3 An image receiving sheet was produced in the same manner as in Example 2. However, after the image receiving layer was formed, the image receiving sheet was cut into sheets and subjected to a heat treatment at a temperature of 120 ° C. for 1 hour.

Comparative Example 4 An image receiving sheet was produced in the same manner as in Example 4. However, after the image receiving layer was formed, the image receiving sheet was cut into sheets and subjected to a heat treatment at a temperature of 120 ° C. for one hour.

Comparative Example 5 An image receiving sheet was produced in the same manner as in Example 1. However, immediately after drying, it was moisture-proof packed and left in a room at 65 ° C. for 2 days.
The room temperature was controlled at 65 ° C. ± 3 ° C., and the humidity was controlled at 35% RH. The heat treatment was performed in a roll state, and the winding diameter was 700 mm.

Comparative Example 6 An image receiving sheet was produced in the same manner as in Example 4. However, immediately after drying, it was moisture-proof packed and left in a room at 30 ° C. for 10 days. The room temperature was controlled at 30 ° C. ± 3 ° C., and the humidity was controlled at 35% RH. The heat treatment was performed in a roll state, and the winding diameter was 700 mm.

Comparative Example 7 An image receiving sheet was produced in the same manner as in Example 4. However, it was left in a room at 50 ° C. for 10 days without moisture-proof packaging. The room temperature was controlled at 50 ° C. ± 3 ° C., and the humidity was controlled at 85 ± 5% RH. The heat treatment is performed in a roll state, and the winding diameter is 70.
It was 0 mm.

Evaluation Test Examples 1, 2, 3, and 4, and Comparative Examples 1, 2,
The curl resistance of the image receiving sheets 3, 4, 5, 6, 7, 8 and 9 was measured. The image receiving sheet was printed using a commercially available sublimation color video printer (trademark: VY-P1, Hitachi, Ltd.), and the presence or absence of abnormal transfer with the ink ribbon was evaluated. Further, the image density and image quality of the obtained print image were evaluated.

Incidentally, the curling resistance is as follows.
× 100 mm, cut on a horizontal plane with the image receiving layer surface facing down, measure the height of the four corners of the sheet from the plane, record the maximum height, and record the flat The samples (the height = 0) were evaluated as “good”, those having a maximum height of 10 mm or less were evaluated as “slightly poor”, and those having a maximum height exceeding 10 mm were evaluated as “bad”.

For abnormal transfer with the ink ribbon, a solid black pattern of a color bar signal generator (trade name: C13A2, manufactured by Shibasoku Co., Ltd.) was printed on the image receiving sheet, and the presence or absence of transfer of each ink ribbon binder was evaluated. .

For the print density, a step pattern of a color bar signal generator (trade name: C13A2, manufactured by Shibasoku Co., Ltd.) is printed, and the maximum density is determined by a Macbeth densitometer (RD-9).
14, Kollmorgen Corp.).

Regarding the image quality, the degree of white dropout in the halftone image portion of the step pattern print image on the image receiving sheet was observed, and according to the foreign matter measurement chart of JIS P8145, the case where no white dropout was recognized was good. Slightly poor when 1 to 3 white spots less than 5 mm ² were observed, 1.5
When four or more white spots with a size of less than mm ² were found, or when white spots with a size of 1.5 mm ² or more were found, a three-point evaluation was made.

Table 1 shows the test results.

[0046]

[Table 1]

Comparative Example 8 An image receiving sheet was prepared and heat-treated in the same manner as in Example 2. However, a sheet-like support having a width of 1,000 mm and a length of 7,500 m was used. The roll diameter of the roll was 1360 mm. The heat treatment was performed by leaving the substrate in a room at 50 ° C. for 3 days. Room temperature is 50 ℃ ± 3 ℃ and relative humidity is 35%
RH was controlled.

Comparative Example 9 An image receiving sheet was prepared and heat-treated in the same manner as in Comparative Example 8. However, the heat treatment was performed for 10 days. Room temperature is 5
The temperature was controlled at 0 ° C. ± 3 ° C. and the relative humidity was controlled at 35% RH.

[0049]

According to the method for producing an image receiving sheet of the present invention, an image receiving layer of an image receiving sheet used in a sublimable dye thermal transfer recording system is applied, dried, wound up on a roll having a diameter of 900 mm, and moisture-proof wrapped. Heat treatment, at that time temperature 30-60
C. and a relative humidity of 75% or less, thereby making it possible to manufacture an image receiving sheet having stable print density and no abnormal transfer to an ink ribbon, and is of high practical value.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of an example of an image receiving sheet manufactured by the method of the present invention.

FIG. 2 is an explanatory cross-sectional view of another example of the image receiving sheet manufactured by the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Image receiving sheet 2 ... Sheet-like support body 3 ... Image receiving layer 4 ... Back cover layer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-135795 (JP, A) JP-A-51-16358 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 5/38-5/40

Claims (1)

(57) [Claims] Claims: 1. A sublimable dye-dyeable resin selected from a polyester resin, a polycarbonate resin, a vinyl chloride copolymer resin and a cellulose derivative as a main component on a surface of a sheet-like support, and an isocyanate compound. The sublimation dye-dyeable image-receiving layer is formed by coating and drying the coating liquid containing the coating liquid, and the obtained coating sheet is wound into a roll having a winding diameter of 900 mm or less. The rolls of sheet are moisture proof wrapped and placed at 30-60 ° C and 7 ° C.
A method for producing a sublimable dye thermal transfer image-receiving sheet, wherein a heat treatment is performed at a relative humidity of 5% or less.