JPH03180843A - Image transfer method and image transfer device - Google Patents

Abstract

PURPOSE:To eliminate the deviation of register mark of a transfer image by overlapping an image sheet with a material to be transferred and pressurizing them at a higher pressure by using two or more pairs of pressurizing rolls after pressurizing them at the low pressure. CONSTITUTION:The image sheet which is exposed and developed is overlapped with the material to be transferred such as an art sheet, etc., and after they are passed through a pair of pressurizing rolls 11 and 12 whose pressure is made low, they are passed through the pair of pressurizing rolls 21 and 22 whose pressure is made higher than that of the rolls 11 and 12, then, the image is transferred on the material to be transferred. In the case of using three or more pairs of pressurizing rolls, the pressure of the first pressurizing roll is made lower than that of the master pressurizing roll. In this method, such the state that the image sheet temporarily adheres on the material to be transferred by the first roll can be obtained, and they are pressurized by the following roll in this state, so that the image can be transferred without causing image deviation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image transfer method and an image transfer device. The present invention can be used, for example, as a method and apparatus for creating a color proof for color proofing in color printing, and in that case, it can be particularly embodied as a color proof transfer technology that prevents so-called registration mark misalignment. .

[Conventional technology]

Traditionally, in color printing, a 4-color halftone negative (or halftone positive) is usually created from a color original, and after the necessary processes such as pasting and turning, a 4-color 1-sheet positive is created, which is then printed as a proof. After confirming the details, proceed to final printing. In each process, for example, in the proof printing process, confirmation from the orderer is required, and a color proof is created for this purpose.

The technology for creating color proofs is to perform exposure and development corresponding to the first color image to form an image corresponding to the first color on an image sheet (image forming material), transfer this to the transfer material, and then remove the image shift. The second color corresponding image formed in the same way is transferred to the transfer material while aligning with so-called registration marks for prevention, and the corresponding images of the third and fourth colors are transferred to the transfer material in the same manner. There is a way to obtain color images.

At this time, in order to obtain a proper image, it is necessary to prevent misregistration of the image, that is, so-called registration mark misalignment.

Japanese Unexamined Patent Publication No. 60-255497 discloses that the heat conduction is good,
Additionally, there is a description that by using a rigid support plate and cover sheet, it is possible to prevent register mark misalignment during color proof production.

However, in this method, the registration mark misalignment cannot be completely prevented because the cover sheet is simply used to prevent deformation or the like. In addition, since the image sheet on which the image is formed and the material to be transferred are thermally transferred by sandwiching them between the support plate and the cover sheet, there is a drawback that the transfer pressure roll (tub roll) must be heated to a high temperature. . When transfer is performed at high temperatures, thermal deformation occurs in the image sheet and the transfer target material, which also causes image misalignment, and as a result, it is not a drastic solution to the problem.

[Object of the Invention] The present invention solves the above-mentioned problems and makes it possible to obtain a transferred image without register mark deviation (image deviation such as color deviation) during transfer image formation, for example, when creating a color proof. It is an object to provide an image transfer method and an image transfer apparatus.

[Means for solving problems]

In order to solve the above problems, the image transfer method of the present invention is an image transfer method in which an image sheet on which an image is formed and a transfer material to which the image is to be transferred are superimposed, and the image is transferred at least under pressure. When performing an image transfer process by overlapping an image sheet and a material to be transferred using at least two pairs of pressure rolls and passing the image sheet through the pressure rolls, the pressure of the pressure roll passed first is higher than that of the other pressure roll. The pressure is lower than that of the pressure roll.

Further, the image transfer device of the present invention includes at least two pairs of pressure rolls, and the image sheet on which the image is formed and the transfer material to which the image is to be transferred are overlapped and passed through each pressure roll to transfer the image. The image transfer apparatus performs the processing, and the pressure of one pair of pressure rolls through which the image sheet and the transfer material pass first among the pressure rolls is lower than the pressure of the other pressure rolls. It is something.

In the present invention, the image sheet and the material to be transferred are placed one on top of the other, and the image is transferred at least under pressure, but preferably the pressure transfer is performed under some degree of heating. However, in the present invention, since image transfer is performed well without the need for high-temperature heating, the temperature during pressurization does not need to be so high.

Further, at least two pairs of pressure rolls are used, and it is sufficient that the pressure of the pair of pressure rolls through which the image sheet etc. is first passed is lower than the pressure of the other pressure rolls.

However, if three or more pairs of pressure rollers are used, and one of the latter rollers is an auxiliary one, the pressure of the first pressure roller may be higher than the pressure of the main pressure roller. The lower the better.

In the present invention, the pressure of the pair of pressure rolls that first presses the image sheet and the transfer material need only be lower than the pressure of the other pressure rolls, especially the main pressure roll, but is preferably 0.5 A range of ~2 kg/c+fl is good.

Further, this pressure roll does not necessarily need to be heated to a high temperature, but the temperature is preferably in the range of +0 to 80°C. This first pair of pressure rolls functions as a pre-pressure roller with respect to the subsequent main pressure roller.

Further, the pressure of the second and subsequent pairs of pressure rollers may be greater than that of the first pair of pressure rollers. At least one pair of the second and subsequent pressure rollers is the main pressure roller.

The pressure of the main pressure roll is preferably in the range of 2 to 10 kg/cffl, and the temperature is in the range of 60 to 1
Preferably it is 20'C.

(Function) In the present invention, when image transfer is performed by overlapping an image sheet on which an image is formed and a transfer material to which the image is to be transferred, the sheet is first passed through a roll having a lower pressure than other pressure rolls. Therefore, by applying pre-pressure with this first roll and pre-heating if necessary, the image sheet and the transfer material can be temporarily bonded. Since pressure is applied by a subsequent roll (main pressure roll, etc.), image transfer without deviation is performed.

In the present invention, the image sheet and the transfer material may be precisely positioned on the first pressure roll. Precise alignment at this stage is easy because the first pressure roll requires a lower pressure than the other pressure rolls. With this first roll precisely aligned, pressure transfer is performed by the main pressure roll, so
Good transfer without image shift can be achieved even when the transfer is complete.

[Specific aspects of the invention]

In embodying the present invention, specific aspects that can be adopted by the groove bottom of the present invention will be described in detail below.

The image sheet used in the present invention has an image formed thereon using an image forming material or the like. That is, for example, an image can be formed by exposing and developing an image forming material having a photosensitive image forming layer, and this can be used as an image sheet.

Image forming materials that can be used in this case will be described below.

The image forming material used is preferably one in which a colored recording layer containing a photosensitive composition is coated on a support having a releasable surface.

As the support for the image forming material used, a polyester film, particularly a biaxially oriented polyethylene terephthalate film, is preferred from the viewpoint of dimensional stability against water and heat. In addition, acetate film, polyvinyl chloride film,
Polystyrene film and polypropylene film can also be preferably used.

The support in the image forming material preferably has a releasable surface, but if the material of the support itself has a good releasable surface, the support can be preferably used as is. Alternatively, the support may be provided with a releasable surface by subjecting the support to a mold release treatment using a suitable oil-repellent substance or by providing an undercoat layer that functions as a mold release layer.

Examples of oil-repellent substances include silicone resins, fluororesins, and fluorosurfactants. Alternatively, a polyethylene film or a polypropylene film can be laminated onto a two-wheel stretched polyethylene terephthalate film using an adhesive, or a thin layer of polyethylene or polypropylene can be formed on a polyethylene terephthalate film by combining polyethylene or polypropylene with polyethylene terephthalate using a coextrusion method. By doing so, a mold release treatment can be performed.

In addition, examples of the undercoat layer that functions as a release layer include alcohol-soluble polyamide, alcohol-soluble nylon,
A blend of a partially esterified resin of a copolymer of styrene and maleic anhydride and methoxymethylated nylon,
Polyvinyl acetate, polyacrylate, copolymer of polymethyl methacrylate and acrylate, polyvinyl chloride, copolymer of vinyl chloride and vinyl acetate, polyvinyl butylade, cellulose acetate butyrate, methyl cellulose, ethyl cellulose l, di Those having weak adhesion to the support, such as cellulose acetate, cellulose triacetate, and polyvinyl alcohol, can be preferably used.

When an undercoat layer is provided and used as a release layer, its thickness is generally in the range of 0.01 to 30 μm, particularly preferably in the range of 0.1 to 5 μm.

As a method for surface treatment of the support in order to provide the support with a releasable surface, for example, a solution or an emulsion prepared by dissolving the resin to form the undercoat layer in an organic solvent is applied onto the support. There is a way to apply it. Further, a method of coating a polypropylene film, a polyethylene film, etc. can be mentioned.

Next, a preferred colored recording layer containing a photosensitive l1II substance, which can be used in the image forming material, will be explained.

The colored recording layer containing the photosensitive composition may be formed in one layer or in two or more layers. In case of 2 or more layers, photosensitive &ll
A photosensitive layer containing a certain substance and a colored layer containing a colorant may be separate layers.

Various types of photosensitive compositions can be used, and when irradiated with actinic rays, their molecular structure undergoes a chemical change in a short period of time, and their solubility in solvents changes, resulting in certain types of photosensitive compositions. All compounds such as monomers, prepolymers and polymers whose exposed or unexposed areas are dissolved and removed when a solvent is applied are included. Examples of photosensitive compositions that can be used include photocrosslinkable photosensitive compositions, such as those made by esterifying polyvinyl alcohol with cinnamic acid, which are so-called negative-positive type compositions in which the solubility of exposed areas decreases. There are resin systems, systems in which diazonium salts and their condensates are mixed with polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, etc., and systems in which aromatic azide compounds are used as photocrosslinking agents and mixed with binders such as cyclized rubber. Photosensitive resins using photoradical polymerization or photoionic polymerization can also be used.

In addition, as a so-called positive-positive type that increases the solubility in the exposed area, there is, for example, a photosensitive resin composition using 0-quinonediazide as a photosensitizer, and specifically, for example, 1,2-benzoquinonediazide- 4-sulfonyl chloride, 12-naphthoquinonediazide-4-sulfonyl chloride, 1.2-naphthoquinonediazide-5-sulfonyl chloride, or 1.2-naphthoquinonediazide-6-sulfonyl chloride and a compound containing a hydroxyl group and/or an amino group. Condensed compounds are preferably used.

Examples of the above-mentioned hydroxyl group-containing compounds include trihydroxybenzophenone, dihydroxyanthraquinone, bisphenol A1 phenol novolac resin, resorcin benzaldehyde condensation resin, and pyrogallol acetone condensation resin. Further, examples of the amino group-containing compound include aniline, p-aminodiphenylamine, p-ayonobenzophenone, 4,4'-diaminophenylamine, 4.4°-cyanobenzophenone, and the like.

Regarding 0-quinonediazide compounds, including those mentioned above, please refer to "Light 5en" by J. KO3AR.
si-tive System” (Wiley&5on
s, New York, 1965) and co-authored by Nagamatsu and Inui.
It can be carried out according to the description of Photosensitive Polymer °' (Kodansha, published in 1977).

In addition, positive-positive type compounds include (1) a compound that can generate an acid when irradiated with actinic rays, (2) a compound that has at least one bond that can be decomposed by an acid, and (4) a novolac resin that contains two or three different types of phenols. It is also possible to use a photosensitive composition containing.

The appropriate content of the photosensitive composition in the colored recording layer is, for example, 5 to 80% by weight.

The colored recording layer having the photosensitive group rft, +JjyJ is 1
Whether it is a layer or is divided into two or more layers, it may contain a binder that is film-forming and solvent-soluble, preferably soluble or swellable in an alkaline developer. A polymer compound can be used.

Specific examples of such polymer compounds include the following -
A polymer compound containing a structural unit having an aromatic hydroxyl group represented by formula (1) in its molecular structure can be mentioned.

General formula (1) where R11 and RI! is a hydrogen atom, an alkyl group, or a carboxylic acid group, R1″ is a hydrogen atom, a halogen atom, or an alkyl group, RI4 is a hydrogen atom, an alkyl group, a phenyl group, or an aralkyl group, and X is connected to a nitrogen atom and an aromatic carbon atom It is a divalent organic group, and n is 0 or l. Y represents a phenylene group that may have a substituent or a naphthylene group that may have a substituent.

Specific examples of monomers forming the structural unit represented by formula (1) above include N(4-hydroxyphenyl)-(meth)acrylamide, N-(2-hydroxyphenyl)-(meth) Acrylamide, N-(4-
Hydroxynaphthyl)-(meth)acrylamide, etc.
Examples include monomers of meth)acrylamides; o-, m-, or p-hydroxyphenyl (meth)acrylate monomers; o-, m-, or p-hydroxystyrene monomers. Preferably o -m- or p-hydroxyphenyl (meth)acrylate monomers, N-
(4-hydroxyphenyl)-(meth)acrylamide monomer, more preferably N-(4-hydroxyphenyl)-(meth)acrylamide monomer.

In the present invention, it is preferable to use as a binder a copolymer of a monomer forming the structure represented by formula (1) above and the following monomers, etc. Acrylonitrile: R+5 ■ CH, =C N alkyl Acrylates: Cf1z=CC-OR” 1 ls Acrylic acids: CI+2=C −011 1 Here, RI5 represents a hydrogen atom, an alkyl group, or a halogen atom, and RI6 represents an alkyl group, a phenyl group, or a naphthyl group. .

General formula (1) in the above copolymer The ratio of groups having an aromatic hydroxyl group is 1 to 30 moles. % is preferred.

The proportion of units formed from the acrylonitriles in the copolymer is preferably 0 to 50 mol%, and more preferably 5 to 40 mol% in consideration of developability. The proportion of structural units formed from the alkyl acrylates is preferably 50 to 95 mol% from the viewpoint of developability with a low alkaline aqueous solution, and most preferably 60 to 95 mol%. Give sex.

In addition to the above-mentioned structural units, the above-mentioned acrylic acids such as acrylic acid or methacrylic acid may be copolymerized with the polymer compound that is the copolymer for the purpose of finely adjusting the developability. Considering the development latitude, the proportion of the coalescence in the polymer compound is preferably 0 to 20 mol%, most preferably 0 to tO mol%.

The weight average molecular weight of such a polymer compound is preferably from 1,000 to 100,000, more preferably from 1,000 to 100,000, from the viewpoint of developability or resolution when a low alkaline aqueous solution is used as a developer. A range of 30.000 is preferred. These polymer compounds can be synthesized by a well-known copolymerization method.

Specific examples of such polymer compounds include copolymers having the following structure.

(Polymerization average molecular weight: 1,000-30,000)1
: m : n N ~25) : (5~40
): (50-95) As the binder for the colored recording layer of the image forming material used, a polymer compound having a carboxylic acid vinyl ester polymer unit represented by the following formula in its molecular structure can also be preferably used.

RCOOCtl　”　C1l　z However, R represents an alkyl group having 1 to 17 carbon atoms.

Any polymer compound having the above structure can be used, but as the carboxylic acid vinyl ester monomer for constructing the polymerized unit represented by the above formula, the following examples are preferred. The name and chemical formula are also shown.

■Vinyl acetate C1l+C00CH=CHz
■Vinyl propionate C1 (3C! (3COOCI)
I = CH2 ■ Vinyl butyrate CI (U (C1
1□) zcOOc)l = C1l□■ Beer pivalic acid (Cl(+) 3CCOOC1l = CH2■
Vinyl caproate C1(3(CH2) 4COOCI
I = C11z■Vinyl caprylate C) I*(
CL)6cOOcH=cHz■Vinyl caprate
C11z(CFIz)acOOcH=cL■Vinyl laurate CHi (CHz) +. C00CII=
Ch■ Vinyl myristate CH3 (CH2) +□
C00Cfl = C1l! [Phase] Vinyl partate CHz (CHz) + 4COOCFt=CII□■
Vinyl stearate CH3 (CHz) + aCOOC
H=CHz@vinyl versatate 113 R' -C-C00 (Jl = CB□2 (pl, R2 is an alkyl group, and the sum of its carbon numbers is 7. In other words, it is in the form of R' + R""C7fl + 6 ) As the carboxylic acid vinyl ester monomer, those having 1 to 4 carbon atoms in the main chain of the carboxylic acid are more preferable.

Particularly preferred is vinyl acetate.

Note that the above R also includes an alkyl group having a substituent, that is, a vinyl ester of a substituted carboxylic acid is also included in the polymerization unit.

The polymer compound may be a polymer obtained by polymerizing one type of carboxylic acid vinyl ester, a polymer obtained by copolymerizing two or more types of carboxylic acid vinyl esters, or a polymer that can be copolymerized with carboxylic acid vinyl ester. It may be a copolymer with monomers in any composition ratio.

Examples of monomer units that can be used in combination with the polymerized unit represented by the above-mentioned formula include ethylenically unsaturated olefins such as ethylene, propylene, isobutylene, butadiene, and isoprene, such as styrene, α-methylstyrene, Styrenes such as p-methylstyrene and p-chlorostyrene, acrylic acids such as acrylic acid and methacrylic acid, unsaturated aliphatic dicarboxylic acids such as itaconic acid, maleic acid, and maleic anhydride, such as diethyl maleate, maleic acid, etc. Diesters of unsaturated dicarboxylic acids such as dibutyl acid, di-2-ethylhexyl maleate, dibutyl fumarate, di-2-ethylhexyl fumarate, such as methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, acrylic dodecyl acid, 2-chloroethyl acrylate,
α-methylene aliphatic monocarboxylic acid esters such as phenyl acrylate, α-methyl chloroacrylate, methyl methacrylate, and ethyl methacrylate; Nitriles such as acrylonitrile and methacrylonitrile; Amides such as acrylamide; e.g. acrylic anilide, p-chloroacrylanilide, m-nitroacrylanilide, m-methoxyacrylanilide, etc., such as methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether,
Vinyl ethers such as β-chloroethyl vinyl ether, vinyl chloride, vinylidene chloride, vinylidene cyanide, such as 1-methyl-l-methoxyethylene, l.

Ethylene derivatives such as l-dimethoxyethylene, l,2-dimethoxyethylene, l,1-dimethoxycarbonylethylene, l-methyl-1-nitroethylene, such as N-vinylpyrrole, N-vinylcarbazole,
There are vinyl monomers such as N-vinyl compounds such as N-vinylindole, N-vinylpyrrolone, and N-vinylpyrrolidone. These vinyl monomers exist in polymer compounds with a structure in which unsaturated double bonds are cleaved.

Particularly preferred as the polymer compound to be used is one having a vinyl acetate polymer unit in its molecular structure. Among them, those having 40 to 95 wt% of vinyl acetate polymerization units, and those having a number average molecular weight (MN) of 1,000 to 100,
000, weight average molecular weight (MW) is 5.000
~500,000 is preferred.

More preferably, vinyl acetate polymerized units (especially 40
~95 wt%) and polymeric compounds having a carboxylic acid vinyl ester polymer unit with a longer chain than vinyl acetate are preferred, especially those with a number average molecular weight (MN) of 2.000 to 60.0.
00, weight average molecular weight (MW) is 10,000 to 150
,000 is preferred.

In this case, the monomer that copolymerizes with vinyl acetate to form a polymer compound having vinyl acetate polymerized units may be any monomer that can form a copolymer, such as among the monomers listed above. You can arbitrarily choose from.

Copolymers that can be used as polymer compounds in the present invention are listed below by indicating their monomer components. However, it goes without saying that the invention is not limited to the following examples.

■Vinyl acetate-acrylate ester■Vinyl acetate-maleate ester■Vinyl acetate-ethylene■Vinyl acetate-vinyl carboxylate ester■Vinyl acetate-ethylene■Vinyl acetate styrene ■Vinyl acetate-crotonic acid■Vinyl acetate-maleic acid■ Vinyl acetate-2-ethylhexyl acrylate [phase]
Acetic acid and nyl-di-2-ethylhexyl maleate ■Vinyl acetate-methyl vinyl ether ■Vinyl acetate-vinyl chloride ■Vinyl acetate-N-vinylpyrrolidone [phase] Vinyl acetate-vinyl propionate ■Vinyl acetate-
Vinyl pivalate [Phase] Vinyl acetate - Vinyl laurate [Phase] Vinyl acetate - Vinyl stearate [Phase] Vinyl acetate - Vinyl citrate - Ethylene [Phase] Vinyl acetate - Vinyl laurate Vinyl-2-ethylhexyl acrylate ■Vinyl acetate Rubersatate - Vinyl Laurate @ Vinyl Acetate Rubersatate - Vinyl Crotonic Acid 0 Vinyl Propionate - Vinyl Versatate [Phase] Vinyl Rubersatate - Croton Acid: Hybaric acid-vinyl stearate-maleic acid Novolak resins obtained by polycondensation of at least one phenol and an active carbonyl compound can also be used as binders.

These phenols include all compounds in which at least one hydrogen atom bonded to an aromatic ring is replaced with a hydroxyl group, and specifically include phenol, 0-cresol, m-cresol, and p-cresol. , 3,5-xylenol, 2.4-xylenol, 2.5-xylenol, carvacrol, thymol, catechol, resorcinol, hydroquinone, pyrogallol, phloroglucin, alkyl group (1 to 8 carbon atoms) substituted phenol, etc. .

Active carbonyl compounds include, for example, aldehydes and ketones, and specific examples include formaldehyde, acetaldehyde, benzaldehyde, acrolein, furfural, and acetone.

Examples of polycondensation resins include phenol formaldehyde novolak resin, m-talesol formaldehyde novolac resin, phenol/m-creso/L/-formaldehyde copolycondensate resin, and phenol/p-cresol/formaldehyde copolycondensate resin.
Formaldehyde copolycondensate resin, m-cresol/p
-Cresol formaldehyde copolycondensate resin, 0-
Cresol/p-cresol/formaldehyde copolycondensate resin, phenol/0-cresol/m~cresol/formaldehyde copolycondensate resin, phenol/0
Examples include -cresol/p-cresol/formaldehyde copolycondensate resin, phenol/m-resol/p-cresol/formaldehyde copolycondensate resin, and the like.

A preferred novolak resin is a phenol formaldehyde novolak resin, and the weight average molecular weight MW is 3500 to 500. Number average molecular weight MN is 1000-20
A value in the range of 0 is preferred.

The molecular weight of the resin is measured by GPC (gel permeation chromatography). Calculation of the number average molecular weight label and weight average molecular weight curve is based on Morio Takuue, Tatsuya Miyabayashi, and Masayuki Kuninaka, “Journal of the Chemical Society of Japan,” pp. 800-805 (19
The method described in 1972) is used to level out the peaks of the oligomer region (connecting the centers of the peaks and valleys).

Further, in the novolak resin, pyrolysis gas chromatography (PCC) is used as a method for confirming the quantitative ratio of different phenols used in the synthesis thereof.

Regarding pyrolysis gas chromatography, its principles,
The equipment and experimental conditions are, for example, Nihon Kagaku complete edition, digit value New book new experimental course, volume 19, polymer chemistry (1) p. 474 ~
It is described on page 485 (published by Marukubi in 1978), etc.
The method for qualitative analysis of novolac resins by pyrolysis gas chromatography is based on the method described in "Analytical Chemistry" by Morio Ojibara, Takashi Kuninaka, and Masayuki Kuninaka, Vol. 18, pp. 47-52 (1969). shall be taken as a thing.

Furthermore, other polymeric compounds that can be used as binders include sulfoalkyl esters of (meth)acrylic acid (co)polymers, vinyl acetal (co)polymers, vinyl ether (co)polymers, and acrylamide (co)polymers. Also included are polymers, styrene (co)polymers, cellulose derivatives, and the like.

In addition, when the colored photosensitive layer contains a novolak resin obtained by polycondensation of at least one type of phenol and an active carbonyl compound as a binder, in order to prevent coloring due to oxidation of the novolak resin, the colored photosensitive layer Antioxidants can also be included in the layer.

In the present invention, the image sheet on which an image is formed includes:
Those colored with any coloring agent can be used. This can be obtained by using the above-mentioned image forming material with a coloring agent.

Coloring agents include dyes and pigments, and in particular,
When used for color proofing, pigments and dyes with tones that match the usual colors required, i.e., yellow, magenta, cyan, and black, are required, but other materials such as metal powder, white pigments,
Fluorescent pigments are also used. Below are some examples of various pigments and dyes known in the art.

(C, I mean color index).

Victoria Pure Blue (C, I 42595') Auramine (C1I 41000) Cathylone Brilliant Flavin (C, I Basic 13> Rhodamine 6 CCP (C, 145160) Rhodamine B (C, ■45170) Safranin OK2O:
100 (C, I 50240) Erioglaucine X (C, r 42080) Fast Black HB
(C, I 26150'') Nα120 Elionol Yellow- (C, I 21090) Lionol Yellow GRO (C, I 21090) Shimla Fast Yellow 8CF (C, I 21105') Benzidine Yellow 4T-5640 (C, I 21095) Shimla Fur Red 4015 (C, I 12355) Lionor Red 7 B12O3 (C, I 15830
) First Gen Blue TGR-L (C, I 74160) Lionor Blue SM (C, I 26150) Mitsubishi Carbon Black MA-100 Mitsubishi Carbon Black #30. #40. The content of the colorant in the colored photosensitive layer in the image forming material used in #50 may be selected in consideration of the target optical density and the removability of the colored photosensitive layer with respect to the developer.
It is preferable to set it as the range of weight%.

In order to produce the image forming material, each of the materials forming the colored recording layer described above may be dissolved in an appropriate solvent and coated on the support described above.

As a solvent, water, methanol, ethanol, acetone, ethyl acetate, methyl cellosolve, ethyl cellosolve,
dioxane, methyl ethyl ketone, cyclohexanone,
Diethylene glycol monomethyl ether, γ-butyrolactone, tetrahydrofuran, methylene chloride,
Examples include ethylene chloride, dimethyl sulfoxide, dimethyl formamide, etc., and these can be used alone or in combination of two or more.

Next, a transfer material used in the present invention, on which an image is transferred from an image sheet on which an image is formed to form a transferred image, will be described.

Examples of transfer materials include papers such as art paper, coated paper, and high-quality paper; films such as polyester film, acetate film, polyvinyl chloride film, polystyrene film, polypropylene film, and polyethylene film; and aluminum plates. Metals such as iron plates, copper plates, etc. can be used, and there are no particular limitations.

〔Example] Examples of the present invention and comparative examples will be described below.

It should be noted that, as a matter of course, the present invention is not limited only to the embodiments described below, but can take various forms.

Example-1 (Creation of image sheet) In this example, first, the following image forming material was created,
Using this, an image sheet on which four-color images were formed was created.

That is, a 75 μm thick polyethylene terephthalate film was used as a support, and a 30 μm thick polypropylene film (Torephan 3931 manufactured by Toshi Co., Ltd.) was placed on top of the support using a dry coating method to form a releasable surface. A colored recording layer dispersion having the following composition was coated onto the polypropylene film surface of the support using a wire bar so that the dry film thickness was 1 μm, and the photosensitive composition was dried. Colored image forming materials of four colors were prepared, each of which had a colored recording layer coated thereon.

(Colored recording layer dispersion liquid composition) L-butylphenolnaphthoquinone-1,2-diazide sulfonic acid ester 0.616g Vinyl acetate-Vinyl versatate-Vinyl laurate-Crotonic acid (55:20:20:5 parts by weight) Polymer 4.384
gMN=32,000 MW=72000 The following pigments The following amounts Ethyl cellosolve 39, 6g Fluorine surfactant (manufactured by 3M, FC-430) 0.25g
- Red black: Carbon black MA-100 (manufactured by Mitsubishi Kasei) 0.99g Nidianin Blue 4920 (manufactured by Dainichiseika) 0.55g Magenta: Seika First Carmine 1483 Cyan (manufactured by Dainichiseika) 0.68g Yellow: Seika First Yellow H-7055 (manufactured by Dainichiseika) 0.68g Color separation mesh positive film of each color was superimposed on the surface of the colored recording layer side of the obtained four-color image forming material, and a 50cm long film was heated using a 4kW metal halide lamp. Perform image exposure for 60 seconds from a distance,
Development was performed by immersing it in the following developer for 30 seconds to form a four-color colored image. As a result, image sheets were obtained on which images of four different colors were formed.

<Developer> NazCOx 15
g Surfactant (Perex NBL manufactured by Kao Atlas Co., Ltd.) 50
g Distilled water 10100O Image transfer) Using the image sheets on which black, cyan, magenta, and yellow images obtained above were formed, the images were transferred to a transfer material as follows.

That is, art paper, which is a transfer paper, was used as the transfer material. The image transfer device includes a pair of pressure rolls (hereinafter referred to as blur rollers) 11 and 12 through which the image sheet, etc. passes first, as shown in Fig. 1, and a pair of pressure rolls with a higher pressure than the pressure rolls. Press roll (hereinafter referred to as press roller)
21.22 was used.

The above-mentioned image sheet and art paper as a transfer material were placed one on top of the other, and using such an apparatus, pressure was applied under the following conditions to perform transfer.

Transfer conditions: Brawler pressure: 0.5 kg/c - temperature: 50'C
Press roller pressure 3 kg/cm2 temperature 10
The 0°C transfer was performed in the order of black, cyan, magenta, and yellow to obtain a color proofing sheet consisting of four colors on art paper as transfer paper. The values of register mark deviation after four-color lamination are shown below.

In this way, the color proof obtained is 265 in the vertical direction.
50μ for mm, 70μ for lateral 407mm
As shown, the registration mark deviation (color deviation) due to heat shrinkage was small. Therefore, by using the present invention, it is possible to realize good image transfer with extremely small register mark deviation.

In FIG. 1, reference numeral 3 denotes a foot tray, on which IS image-receiving sheets and the like are conveyed as indicated by arrow 4. 5 is a guide, 6 is a conveyance roller, 7 is a cooling fan, 8 is an electrical component, 9 is a pedestal, 1
0 is a pedestal.

Comparative Example-1 The same procedure as in Example-1 was performed except that the transfer was performed using only the press rollers 21 and 22.

The value of registration mark deviation in this case is shown below.

The obtained color proof is free from registration mark misalignment due to heat shrinkage (
There was a large amount of color shift (color shift), and the clarity of the transferred image was low.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide an image transfer method and an image transfer apparatus that can obtain a transfer image without register mark deviation during transfer image formation.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an image transfer device according to an embodiment of the present invention. 11, 12... Pressure roll (Bure roller) to be passed through first, 21.22... Pressure roll (Press roller).

Claims (1)

[Claims] 1. An image transfer method in which an image sheet on which an image is formed and a transfer material to which the image is to be transferred are superimposed and the image is transferred under at least pressure, comprising at least two pairs of pressure rolls. When carrying out the image transfer process by overlapping the image sheet and the transfer material and passing the image sheet through the pressure roll, make sure that the pressure of the pressure roll that is passed first is lower than the pressure of the other pressure rolls. Characteristic image transfer method. 2. An image transfer device comprising at least two pairs of pressure rolls, in which an image sheet on which an image is formed and a transfer material to which the image is to be transferred are overlapped and passed through each pressure roll to perform image transfer processing. The image transfer apparatus is characterized in that the pressure of the pair of pressure rolls through which the image sheet and the transfer material first pass through among the pressure rolls is lower than the pressure of the other pressure rolls.