JPH09160258A - Colorproof transfer device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy both the prevention of positional deviation and transferring performance and to transfer a colorproof with high quality. SOLUTION: In this device, an image receiving sheet 7 and a color sheet 1 where a color material image is formed are superposed and pressed to be processed by a heating roller 40 so as to transfer the color material image on the sheet 7 on a transfer drum 12. In such a case, the surface of the roller 42 is made of an elastic body whose film thickness is 1 to 2.5mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color proof transfer device and a transfer method using the same.
More specifically, the present invention relates to a color proof transfer device improved so as to prevent misalignment while maintaining transferability of a multicolor image, and a transfer method using the same.

[0002]

2. Description of the Related Art Conventionally, in the field of multicolor printing, color proofing has been generally performed by proof printing as a pre-step of main printing. That is, the image receiving sheet and the color sheet on which the color material image is formed are superposed and pressure-heated to transfer the color material image to the image receiving sheet,
Then, the color proof is transferred and produced by repeating the above-mentioned processing for different color sheets. The color sheet on which the color material image is formed is usually each color of yellow (Y), magenta (M), cyan (C), and black (BK), and the color of each color that is an image forming material. It is obtained by stacking a color separation network film for each color plate on a sheet, exposing and developing.
The transfer of the color proof is performed by using a color proof transfer device configured such that the image receiving sheet and the color sheet on which the color material image is formed are superposed on the transfer drum and pressed by the heating roller. Examples of the transfer device include those described in JP-A-3-114044, JP-A-3-120552, and JP-A-3-136049.

[0003]

However, when the color proof is transferred by the above-mentioned transfer device, misalignment of a multicolor image occurs, and further improvement is desired in terms of producing a high quality color proof. There is. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a color proof transfer device that does not cause a transfer property problem and has a small misregistration, and a transfer method using the same.

[0004]

As a result of various investigations on a color proof transfer device, the present inventors set the film thickness of the elastic body on the surface of the heating roller within a specific range to maintain the transferability. The inventors have found that both of the above problems and the elimination of the positional deviation are solved, and have reached the present invention.

That is, the gist of the present invention is to provide a color proof for transferring a color material image onto the image receiving sheet by stacking the image receiving sheet and the color sheet on which the color material image is formed on the transfer drum, and pressing the same with a heating roller. The transfer device of the color proof is characterized in that the surface of the heating roller is an elastic body having a film thickness of 1 to 2.5 mm. Another aspect is a color proof transfer method in which an image receiving sheet and a color sheet on which a color material image is formed are superposed on a transfer drum and pressed by a heating roller to transfer the color material image to the image receiving sheet. In the above, using the above-mentioned transfer device, transfer on each color sheet is performed in two steps with different rotation speeds of the transfer drum, and in the second step,
A color proof transfer method is characterized in that transfer is performed under a lower speed condition than the first stage.

Hereinafter, the present invention will be described in detail. The heating roller, which is the greatest feature of the color proof transfer device of the present invention, has a heating means inside, and is a roller using metal such as iron or its alloy to maintain strength as a core material, The surface has an elastic structure in order to efficiently perform the pressing process of the color sheet. The elastic body can be formed on the surface of the core material roller by a usual means such as coating or laminating. The film thickness of the elastic body is 1
It is in the range of up to 2.5 mm, preferably 1.3 to 2.2 mm. If the thickness is thicker than the above range, the positional deviation becomes large, and conversely, if the thickness is thin, problems with transferability tend to occur, which is not preferable. The material of the elastic body preferably has spring hardness JIS A (JIS K6301) in the range of 10 to 100, and specifically, natural rubber, silicone rubber, neoprene rubber, butyl rubber, SBR rubber, EP.
DM, Hypalon, Thiokol, Vuitton, polyester urethane and the like can be mentioned.

If the hardness exceeds the above range, problems in transferability tend to occur, while if it is less than the above range, misalignment tends to increase. The color proof transfer device of the present invention is an improvement of the heating roller of the above-described various conventionally known image transfer devices. That is, as long as the present invention is configured so that the image receiving sheet and the color sheet on which the color material image is formed are superposed on the transfer drum and subjected to the pressing process with the heating roller having the specific surface, the image transfer of any structure is possible. It also includes devices. For example, the transfer apparatus of the present invention and the color proof transfer method using the transfer apparatus will be described below by taking the apparatus shown in FIGS. 1 to 4 as an example.

FIG. 1 is a schematic front view of an essential part of an example of a color proof transfer device of the present invention, FIG. 2 is a front view showing the inside of the image transfer device shown in FIG. 1, and FIG. 3 is an image shown in FIG. FIG. 4 is a left side view showing the inside of the transfer device, and FIG. 4 is a sectional view taken along line IV-IV in FIG.

The transfer of a general color proof by the above-mentioned image transfer device is generally performed as follows as shown in FIG. The image receiving sheet (7) is mounted on the transfer drum (12) which is heated to a predetermined temperature in advance, the color sheet (1) on which the color material image is formed is superposed on the image receiving sheet (7), and the transfer drum (12) is indicated by an arrow. The heating (pressing) roller (42) having a specific surface, which is a characteristic of the present invention and which is rotated in advance as described above, is pressed against the color sheet (1) to perform the pressing process. Then, the support (film) (4) of the color sheet (1) is peeled off on the downstream side of the heating roller (42). By this operation, the image (6) is transferred to the image receiving sheet (7). When the transfer drum (12) makes one or two rotations and the image receiving sheet (7) returns to the original position, the rotation of the transfer drum (12) is stopped, and the image sheet of the next color is mounted on the transfer paper. Transfer the next color. By performing the transfer by this operation in the order of yellow (Y), magenta (M), cyan (CN), and black (BK), a transfer image faithful to the original is formed on the image receiving sheet (7). In addition, the thermal softening layer represented by reference numeral (3) in the drawing is provided as necessary.

The transfer device (10) is mounted on a casing (80) containing an air compressor (not shown), and both are integrated. A transfer drum (12) is provided via a bearing (13) having a ball bearing (13A) attached to the main body frame (11) and a bearing stopper (13B) built therein, and the transfer drum (12) is a chain wheel. The drum drive motor (17) can be driven as indicated by the arrow via (14), (15) and the chain (16). In addition, a heating heater (3
8) is provided so as to be held by the mounting bracket (37).
Therefore, the drum (12) is heated by the heater (38) for heating.
The entire structure of (1) is easily controlled to a uniform temperature (50 to 100 ° C.).

A plurality of pressing rollers (18) are arranged at predetermined intervals on the outer peripheral portion of the transfer drum (12), and are pressed by a roller pressure spring (19) so as to contact the transfer drum (12). The bearing portion of the transfer roller (18) is provided slidably in the radial direction of the transfer drum (12) of the main body frame (11). The crimping spring (19) is biased to move the bearing portion in the crimping direction.
Further, the pressing roller (18) prevents the contact with the transfer drum (12) against the pressure spring (19) by the pull-up spacers (21) provided on the outer peripheral portions on both sides of the transfer drum (12). It is possible.

Further, a heating roller (42) which pressurizes the transfer drum (12) at a uniform temperature and is capable of further heating to a temperature required for transfer coats the iron core roller (42A) with the silicone rubber (42B). It is provided as a roller, and the shaft portions at both ends are supported by a bearing (43) having a ball bearing (43A) and a bearing stopper (43B) built therein. The bearing (43) is mounted so as to slide in a slide guide (49) mounted on the body frame (11). The sliding direction is in the radial direction of the transfer drum (12). The bearing (43) is directly connected to the movable part (52B) of the pressurizing air cylinder (52) connected to the air compressor in the housing (80), and the fixed part (52A) of the pressurizing air cylinder (52).
Cylinder mounting bracket (51) on the body frame (11)
It is fixed at. Further, a heater (48) is statically provided at the axial center of the heating roller (42), and is fixed on a fitting (47) provided on a sliding bearing (43).

The alignment between the image receiving sheet and the color pool (not shown) is performed as follows.
That is, the surface portion of the transfer drum (12) corresponding to the front end portion of the pull-up spacer (21) is made into a flat surface to serve as a positioning portion (20), and a pin bar (22) is attached to the positioning portion (20). is there. A small diameter through hole provided at the side edge of the color pool is fitted into the pin bar (22) so that the positional relationship between the image receiving sheet and the color pool can be accurately determined via the transfer drum (12). There is.

The image receiving sheet and the color proof are pressed against each other by the action of the air cylinder (52) between the heating roller (42) and the transfer drum (12), and then the color proof is peeled from the image receiving sheet and the color proof of the color proof. The image is transferred to the image receiving sheet. An exterior cover (11A) is provided on the outside of the main body frame (11) of the transfer part (10) and the housing (80), and an operation panel or the like is provided to facilitate and simplify the operation. Safety is considered.

Next, when the positioning section (20) returns to the original position, the transfer of the next color is continuously performed. Thus,
Only transfer images of four colors of yellow (Y), magenta (M), cyan (CN), and black (BK) are formed on the image receiving sheet, and a full-color transfer image faithful to the original is obtained.

In the present invention, the transfer on each color sheet is carried out in two stages in which the rotation speed of the transfer drum (12) is different, and in the second stage, the transfer is conducted under a lower speed condition than in the first stage. It is preferable.

In this case, the transfer speed (cm / min) in the first transfer is usually 100 to 300 (cm / min),
It is preferably selected from the range of 150 to 250 (cm / min), and the transfer speed (cm / min) in the second transfer
Is usually 10 to 150 (cm / min), preferably 30 to
It is selected from the range of 100 (cm / min), and the transfer speed difference between the two is preferably at least 50 (cm / min) or more, and particularly preferably 60 to 200 (cm / min). . The pressing condition with the heating roller varies greatly depending on the layer structure of the color proof and the components constituting each layer, but the transfer temperature is usually 25 to 140 ° C.
The temperature is preferably 70 to 120 ° C., and the transfer pressure is usually 0 to 20.
kg / cm ^2, and preferably in the range of 2 to 10 kg / cm ^2.

However, in a preferred embodiment of the present invention, the transfer pressure of the first stage is set lower than the transfer pressure of the second stage. In this case, the transfer pressure of the first step is usually 0 to 10 kg / cm ² , preferably 1 to 5 kg / cm 2.
² , more preferably in the range of ^{2 to 4} kg / cm ² ,
The transfer pressure in the second step is usually 3 to 20 kg / cm ² , preferably 3 to 10 kg / cm ² , and more preferably 4 to 1
0 kg / cm ² and the transfer pressure difference between the two is usually 0.5 kg / cm ² or more, preferably 1 k.
g / cm ² or more. Next, a color proof that can be used in the color proof transfer device of the present invention will be described. The color sheet, which is an image forming material, is configured by providing a photosensitive colored layer on a support. Examples of the support include transparent polyolefins such as polypropylene, polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyamides such as nylon 6 and nylon 6/6, polyester amides, polycarbonates and transparent synthetic ketones such as polyether ketones. A film made of resin may be used. The above film is
In order to reduce color misregistration due to the difference in thermal expansion coefficient between the vertical direction and the horizontal direction during transfer, the maximum thermal expansion coefficient (αtmax) is 2.5 × as described in JP-A-7-43898. 10-5 / ° C or less, or JP-A-5-
As described in Japanese Patent No. 273743, the orientation angle is -2.
It is preferably in the range of 0 to +20 degrees. For the purpose of obtaining a finer image, it is preferable to select a support having a small maximum thermal expansion coefficient and a small orientation angle.

The above-mentioned maximum coefficient of thermal expansion means the coefficient of thermal expansion αt in any direction at any position on the support surface.
The highest coefficient of thermal expansion. In the case of a normal biaxially stretched film, the maximum coefficient of thermal expansion is the main orientation direction in the film plane or the direction orthogonal thereto. The stretched film as described above can be obtained, for example, by performing sequential biaxial stretching or simultaneous biaxial stretching under the same temperature conditions at the same stretching ratio in both the longitudinal and transverse directions, and then performing a heat treatment. In this case, vertical,
It is preferable that the transverse stretching ratio be the same. Further, the subsequent heat treatment is preferably performed in a relaxed state.

In order to improve the handling property, it is preferable to add inorganic particles such as silica, alumina, kaolin and talc to the support film. The thickness of the support is not particularly limited, but is preferably 10 to 300 μm, and more preferably 50 to 100 μm from the viewpoint of mechanical strength and heat conduction during transfer.

In order to improve the transferability of the image formed on the above-mentioned support, it is preferable to provide a release layer on the support. For the release layer, for example, a vinyl acetate-based copolymer such as an ethylene-vinyl acetate copolymer, an ethylene-propylene-vinyl acetate copolymer, or a modified product thereof is used. From the viewpoint of transferability, the softening point is 50 to 120.
An ethylene-vinyl acetate copolymer having a temperature of 0 ° C. is particularly preferable.

A method for forming a release layer from an ethylene-vinyl acetate copolymer is disclosed in JP-A-3-18194.
The coating / drying method, the dry laminating method, the hot-melt laminating method, the co-extrusion method and the like as described in JP-A-7 can be mentioned. Other components of the release layer include, for example, JP-A Nos. 51-5101 and 59-97140.
JP-A No. 63-2040 and the like, for example, alcohol-soluble polyamide, alcohol-soluble nylon, a blend of partially esterified resin of a copolymer of styrene and maleic anhydride and methoxymethylated nylon, Polymers of acrylic acid and its derivatives, polyvinyl chloride, polyvinyl butyrate, cellulose acetate and the like can also be used. The thickness of the release layer is preferably 5
To 200 μm, more preferably 50 to 100 μm
It is.

The photosensitive colored layer provided on the support may be one layer by itself, but is not limited thereto, and the colored layer comprising at least a colorant and a binder, and at least the photosensitive composition and the binder. The photosensitive layer may be divided into two layers. In the case of a two-layer structure, either layer may be present on the release layer side or the transparent support side. In the following description, the photosensitive colored layer mainly composed of one layer will be described. Therefore, unless otherwise specified, the term "photosensitive layer" means a photosensitive colored layer.

For the above-mentioned photosensitive layer, a photopolymerizable composition (for negative type photosensitive layer), quinonediazide compound (for positive type), diazo compound / azide compound (for negative type) and the like can be used.

The photopolymerizable composition contains at least one monomer compound such as a polyfunctional vinyl monomer or vinylidene compound capable of forming a polymer by addition polymerization, a photopolymerization initiator activated by actinic rays, and the like. The thermal polymerization inhibitor is added by.

The vinyl monomer or vinylidene compound that can be used in the photopolymerizable composition is, for example, an unsaturated ester of polyol, particularly an ester of acrylic acid or an ester of methacrylic acid. Specific examples include ethylene glycol diacrylate, glycerin triacrylate, polyacrylate, ethylene glycol dimethacrylate, 1,3-propanediol dimethacrylate, polyethylene glycol dimethacrylate, 1,
2,4-butanetriol trimethacrylate, trimethylolethane triacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol polyacrylate , 1,3-propanediol diacrylate,
1,5-pentanediol dimethacrylate, 200-
Examples thereof include bisacrylate and bismethacrylate of polyethylene glycol having a molecular weight in the range of 400. On the other hand, the photopolymerization initiator and the thermal polymerization inhibitor are not particularly limited, and known compounds can be used.

Examples of the quinonediazide compound include:
Examples thereof include ester compounds of polycondensation resins of phenols and aldehydes or ketones with o-naphthoquinonediazide sulfonic acid.

Examples of phenols include monohydric phenols such as phenol, o-cresol, m-cresol, p-cresol, 3,5-xylenol, carvacrol and thymol, and dihydric phenols such as catechol, resorcinol and hydroquinone. , Trivalent phenols such as pyrogallol and phloroglucin.

As the aldehyde, formaldehyde,
Examples include benzaldehyde, acetaldehyde, crotonaldehyde, furfural and the like. Of these aldehydes, formaldehyde and benzaldehyde are preferred. Examples of the ketone include acetone, methyl ethyl ketone, and the like.

Specific examples of the polycondensation resin include phenol / formaldehyde resin, m-cresol / formaldehyde resin, m- and p-mixed cresol / formaldehyde resin, resorcin / benzaldehyde resin, pyrogallol / acetone resin and the like. .

The condensation rate of o-naphthoquinonediazide sulfonic acid with respect to the OH group of phenols (reaction rate with respect to one OH group) is preferably 15 to 80%, more preferably 20 to 45%. The weight average molecular weight of the polymer compound containing o-quinonediazide is 1, from the viewpoint of coating properties.
It is preferably 000 or more, more preferably 1,500 or more.

As the quinonediazide compound, in addition to the above compounds, the compounds described in JP-A-58-43451 can be used. Further, 2,3,4-trihydroxybenzophenone, 2,3,4,4'-tetrahydroxybenzophenone, 2,3,4,2 ', 4'-pentahydroxybenzophenone, 2,3,4,3', Four
A condensation compound of ', 5'-hexahydroxybenzophenone or the like and orthoquinone diazide sulfonic acid can also be used.

Of the above quinonediazide compounds, 1,2
Most preferred is an o-quinonediazide ester compound obtained by reacting a condensate of naphthoquinonediazidesulfonyl chloride with a pyrogallol-acetone condensation resin or a novolac resin or 2,3,4-trihydroxybenzophenone. As the quinonediazide compound, the above compounds may be used alone or in combination of two or more kinds. The preferred amount of the quinonediazide compound is 10 to 4 with respect to 100 parts by weight of the binder in the photosensitive layer.
0 parts by weight.

The diazo compound is a compound represented by a condensate of p-diazodiphenylamine and formaldehyde, and is disclosed in JP-B-47-1167 and JP-A-57-4.
A water-insoluble and ordinary organic solvent-soluble diazo compound described in Japanese Patent No. 3890 is preferably used. On the other hand, as the azide compound, an aromatic diazide compound in which an azide group is bonded to an aromatic ring directly or through a carbonyl group or a sulfonyl group is preferably used. Specifically, polyazidostyrene, polyvinyl-p-azidobenzaate, polyvinyl-p-azidobenzal (US Pat. No. 3,093,311), a reaction product of an azidoarylsulfonyl chloride and an unsaturated hydrocarbon-based polymer. (JP-B-45-9613), polymers having sulfonyl azide and carbonyl azide (JP-B-43-43)
No. 21017, No. 44-22954, No. 45
No. 24915) can be used.

Other negative photosensitive compositions include compounds containing derivatives of cinnamic acid, such as -C.
= C-CO-group-containing polyesters, polyamides, etc. (US Pat. No. 3,453,237), polyvinyl alcohol, cinnamic acid esters of hydroxyl group-containing polymers such as cellulose (US Pat. No. 2,732,301), etc. Is mentioned.

Typical examples of the binder resin used in the photosensitive layer include novolac resins, acrylic resins, vinyl acetate resins, polyurethane resins and epoxy resins. For example, as the novolac resin, a phenol / cresol / formaldehyde copolycondensation resin (JP-A-55-57841), a p-substituted phenol / phenol or a cresol / formaldehyde copolycondensation resin (JP-A-55-127553) are used. Issue). As the vinyl acetate resin, a vinyl acetate-vinyl versatate copolymer (JP-A-3-48248,
No. 3-181947) is preferably used.

A dye or pigment is used as the colorant contained in the photosensitive layer. For example, yellow, magenta, cyan and black dyes and pigments, as well as metal powders, white pigments and fluorescent pigments can be used. The examples shown in Tables 1 and 2 below are just a few of the many pigments and dyes known in the art. (C.I means color index.)

[0038]

[Table 1] Victoria Pure Blue (CI 42595) Auramine (CI 41000) Catillon Brilliant Flavin (CI Basic 13) Rhodamine 6GCP (CI 45160) Rhodamine B (CI 45170) Safranine OK70: 100 (CI 50240) Erioglaucin X (CI 42080)

[0039]

Table 2 First Black HB (CI 26150) No. 1201 Lionol Yellow (CI 21090) Lionol Yellow GRO (CI 21090) Shimura-Fast Yellow 8GF (CI 21105) Benzidine Yellow 4T-564D (CI 21095) Shimura-First Red 4015 (C.I. I 12355) Rionol Red 7B4401 (C.I. 15830) Fastgen Blue TGR-L (C.I. 74160) Rionol Blue SM (C.I.26150) Mitsubishi Carbon Black MA-100, MA-220 Mitsubishi Carbon Black # 30 , # 40, # 50 Cyanine Blue 4920 (manufactured by Dainichiseika) Seika Fast Carmine 1483 (manufactured by Dainichiseika) Seika First Yellow H-7005,2400 (manufactured by Dainichiseika)

The blending amount of the colorant in the photosensitive layer is determined in consideration of the target optical density and the removability of the photosensitive layer from the developing solution. For example, in the case of dyes, the generally preferred amount is 5 to 75% by weight, and in the case of pigments, the generally preferred amount is 5 to 90% by weight, and more preferably both are 5 to 50% by weight.

The film thickness of the photosensitive layer is selected according to the target optical density, the type of colorant (dye, pigment, carbon black) used in the photosensitive layer and its content.
The thinner the resolution is, the better the image quality is. Therefore, the film thickness is preferably selected from the range of 0.1 to 5 μm.

If necessary, a plasticizer, a coatability improver and the like can be added to the photosensitive layer. Examples of the plasticizer include phthalic acid esters, triphenyl phosphates, maleic acid esters, and the like, and examples of the coating property improver include nonionic surfactants represented by ethyl cellulose, polyalkylene ether, and the like. , Fluorine-based surfactants and the like.

The photosensitive layer is usually formed by dissolving a photosensitive composition, a colorant and the like in an appropriate solvent to prepare a coating solution and applying the coating solution on the release layer.

Examples of the solvent include methyl lactate, methyl ethyl ketone, cyclohexanone, ethylene dichloride, dichloromethane, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, ethylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether, ethylene. Glycol monoethyl ether acetate, N, N-dimethylformamide, dimethylsulfoxide, N, N-dimethylacetamide, acetylacetone, dioxane, tetrahydrofuran, γ
-Butyrolactone, propylene glycol monomethyl ether, propylene glycol monoethyl ether acetate, propylene glycol monoethyl ether acetate, diethylene glycol dimethyl ether, diethylene glycol diethyl ether and the like. Particularly preferred solvents are methyl lactate, methyl ethyl ketone or mixtures with other solvents based on these.

As the coating method, for example, roll coating, reverse roll coating, dip coating, air knife coating, gravure coating, gravure offset coating, hopper coating, blade coating, rod coating,
Methods such as wire doctor coating, spray coating, curtain coating, extrusion coating and the like are used.

When the photosensitive colored layer is divided into a colored layer and a photosensitive layer, or when an overcoat layer is coated on the photosensitive colored layer, each layer is coated and dried and then wound up successively. A multilayer coating method, a method of arranging a large number of coaters and driers in parallel on one line, and providing a plurality of layers by one time conveyance of a support (Japanese Patent Laid-Open No. 63-69574) is used.

Drying after coating is usually performed by blowing heated air onto the coated surface. 30-200 degreeC is preferable and, as for heating temperature, the range of 40-140 degreeC is especially suitable. Generally, a method of drying the colored photosensitive layer while keeping the temperature of the heated air constant is adopted, but a method of gradually increasing the temperature of the heated air to dry it is also possible. . The heated air is preferably supplied to the coated surface at a rate of 0.1 to 30 m / sec, and particularly preferably 0.5 to 20 m / sec.

The image formation on the photosensitive colored layer is carried out as follows. First, the color separation network film and a colored image forming material corresponding to each color are brought into close contact with each other, and image exposure is performed by irradiating light such as ultraviolet rays. As a light source,
Mercury lamps, ultra-high pressure mercury lamps, metal halide lamps, tungsten lamps, xenon lamps, fluorescent lamps, etc. are used. Similarly, image exposure is performed for the other three colors. In this case, it is preferable to perform the exposure from the support side because the image reproducibility is high. Next, each exposed material is liquid-developed with a developing solution, washed with water and dried to form an image. As another developing method, for example, a method of performing peeling development by peeling the cover sheet as described in JP-A-2-269349 can be adopted.

In the present invention, the color proof is transferred using the color sheet on which the color material image is formed as described above. That is, on the transfer drum, the image receiving sheet and the color sheet on which the color material image is formed are superposed on each other and pressed by a heating roller to transfer the color material image to the image receiving sheet, and then the above-mentioned processing is performed on different color sheets. Repeat the procedure to transfer the color proof.

As the image receiving sheet, high-quality paper, art paper,
Paper such as coated paper, plastic film such as polyester film and acetate film, plastic film coated with an intermediate layer and an image receiving layer, metal foil such as aluminum foil and copper foil, and a composite material thereof are used.

[0051]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention. Example 1 To prepare a support, an ethylene-vinyl acetate copolymer resin (“EVAFLEX P-1405” manufactured by Mitsui-DuPont Polychemical Co., Ltd .: vinyl acetate) was formed on a biaxially stretched polyethylene terephthalate film (width: 65 cm) having a thickness of 75 μm. A release layer was formed by extruding a content of 14% by weight and a VICAT softening point of 68 ° C. to a thickness of 25 μm by extrusion.

The following pigments were added to the following photopolymerizable composition to prepare coating solutions for four-color negative photosensitive layers, and each coating solution was applied onto each of the above supports by a bar coater. And dried to form a photosensitive colored layer having a dry film thickness of 1.5 μm.

[0053]

[Table 3] Photopolymerizable composition Vinyl acetate-vinyl versatate copolymer (80:20 wt%, weight average molecular weight 50,000, 50% methanol solution) 12 parts by weight Pentaerythritol tetraacrylate 4.3 parts by weight Michler's ketone 0.04 parts by weight benzophenone 0.25 parts by weight paramethoxyphenol 0.01 parts by weight methyl cellosolve 94 parts by weight Fluorine-based surfactant (3M, FC-430) 0.01 parts by weight

Pigment

[Table 4] Black: Carbon black MA-100 (manufactured by Mitsubishi Chemical) 1.98 parts by weight Cyan: Cyanine blue 4920 (manufactured by Dainichiseika) 1.10 parts by weight Magenta: Seika First Carmine 1483 (manufactured by Dainichiseika) 1 .36 parts by weight Yellow: Seika First Yellow 2400 (manufactured by Dainichi Seika) 1.36 parts by weight

Next, a biaxially stretched polyethylene terephthalate film having a thickness of 25 μm (width 65
cm) was applied with a bar coater to a dry film thickness of 0.5 μm and dried. Then, the protective film and the above-mentioned film on which the photosensitive layer had been coated were laminated so that their coated surfaces face each other and pressed by a laminator.

[0056]

[Table 5] Overcoat layer liquid Polyvinyl alcohol (GL-05, manufactured by Nippon Synthetic Chemical Industry) 6 parts by weight Deionized water 97 parts by weight Methanol 3 parts by weight

In order to form a transfer image, a color separation net positive film of each color is superposed on the surface of a polyethylene terephthalate film which is a transparent support of the four-color negative type colored image forming material obtained as described above, and a 4 KW metal halide. Image exposure is carried out for 20 seconds from a distance of 50 cm with a lamp, then the protective film is peeled off, and a developing solution of the following composition is used for 30 seconds.
Development was performed by immersing at 30 ° C. for 30 seconds to form a 4-color colored image. The surface of the overcoat layer after peeling off the protective film was observed, but no particular abnormality was observed.

[0058]

[Table 6] Developer Konica PS plate developer SDP-1 (manufactured by Konica) 20 ml Perex NBL (manufactured by Kao Atlas) 50 ml Water 400 ml

The elasticity of the surface of the heating roller of the apparatus (see FIGS. 1 to 5) described in Example 1 of JP-A-3-120552 is used by using the four color sheets having the colored image formed thereon. Body (silicone rubber, American Roller Co., Ltd. spring hardness JISA (JIS K6301)
No. 70) having film thicknesses of 3 mm, 1.8 mm and 0.5 mm, four-color transfer images were formed on art paper. That is, on the transfer drum (12), the image receiving sheet and the color sheet on which the color material image is formed are superposed on each other and pressed by the heating roller (42) to transfer the color material image to the image receiving sheet. A color proof was created by repeating the same process for. In this case, the first rotation of the transfer drum (12) performs the first-stage transfer (transfer speed 180 cm / min, transfer pressure 5 Kg / cm ² ), and the second rotation of the transfer drum (12) causes the second transfer. Transfer of the second step (transfer speed and transfer pressure shown in Table 1) was performed.

As the image-receiving sheet, gloss art paper (“Tokuryo art” manufactured by Mitsubishi Paper Mills), matte coated paper (“New Age” manufactured by Kanzaki Paper Mills), and fine paper (“Kinryo” manufactured by Mitsubishi Paper Mills Ltd.) used. Table 7 shows the transfer conditions at each stage. The temperatures of the heating rollers were all 80 ° C.

With respect to the obtained four-color image for each image receiving sheet, the position having the largest positional deviation was selected, the distance was measured, and the average value of the five samples was obtained. In addition, the presence or absence of positional deviation of the multicolor image of each image receiving sheet was evaluated by the following five-point evaluation criteria by ten skilled observers, and the average value was obtained. Table 1 shows these results.

[0062]

[Table 7] Five-point Method Evaluation Criteria Five points: No image defects due to transfer defects are noticed at all. 4 points: An image defect portion can be found, but there is almost no concern. 3 points: The image defect portion is a little worrisome. 2 points: The image defect portion is considerably anxious. 1 point: An image defect portion is very worrisome.

[0063]

[Table 8]

[0064]

As described above, according to the present invention, it is possible to satisfy both the prevention of the positional deviation and the improvement of the transfer property at the same time, and therefore it is possible to transfer a high quality color proof.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a main part of an example of a color proof image transfer device of the present invention.

FIG. 2 is a front view showing the inside of the image transfer device shown in FIG.

3 is a left side view showing the inside of the image transfer device shown in FIG. 1. FIG.

4 is a sectional view taken along line IV-IV in FIG.

[Explanation of symbols]

 1 Color Sheet 7 Image Receiving Sheet 12 Transfer Drum 42 Heating Roller

Claims (2)

[Claims] 1. A color proof transfer device for transferring a color material image onto an image receiving sheet by superposing an image receiving sheet and a color sheet on which a color material image is formed on a transfer drum, and pressing the heated sheet with a heating roller. A color proof transfer device, wherein the surface of the heating roller is an elastic body having a film thickness of 1 to 2.5 mm. 2. A color proof transfer method for transferring a color material image onto an image receiving sheet by superposing an image receiving sheet and a color sheet on which a color material image is formed on a transfer drum and pressing the same with a heating roller, 2. A color characterized by using the transfer device according to claim 1, wherein the transfer on each color sheet is performed in two stages with different rotation speeds of the transfer drum, and the transfer is performed in a lower speed condition in the second stage than in the first stage. Proof transfer method.