JPH11124795A - Production of high gloss substrate sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for producing a high gloss substrate sheet having excellent surface smoothness by preventing the generation of peeling unevenness and dent defects such as pit caused by the entrapping of air and the lowering of the surface property caused by the distortion of the substrate sheet in the case of forming an electron ray curable resin layer on the surface of a substrate sheet. SOLUTION: A substrate sheet is pressed against the surface of a forming substrate having a smooth surface interposing a coating liquid layer of an electron ray curable resin composition while transporting the forming substrate, the coating liquid layer is cured by the irradiation of electron rays from the back of the substrate sheet and the sheet is continuously peeled from the surface of the forming substrate. In the above production process, a nip roll made of rubber is pressed against the back of the substrate sheet in the case of laminating the substrate sheet to the surface of the forming substrate interposing the coating liquid layer under a linear pressure of 5-30 kg/cm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sheet-like support. More specifically, the present invention relates to a method for producing a high gloss sheet-like support having excellent surface smoothness.

[0002]

BACKGROUND ART Conventionally, coated paper has been used as a paper processing method.
Support for metallized label, release paper, glossy paper, paper print,
In the fields of laminated paper, heat-sensitive paper, pressure-sensitive paper, decorative paper, and the like, it has been widely practiced to provide a resin layer on one side of the paper for water resistance, for preventing permeation and for adhesion. As a method of providing such a resin layer, a resin composition prepared by appropriately selecting and blending various resins is dispersed or dissolved in water or a solvent, applied to a sheet-like substrate, dried, and a method of melting the resin. A method of laminating a sheet-like substrate and a method of applying a hot melt are widely used.

In recent years, information papers, printing papers, metallized papers and the like, which are beautiful and have a high gloss with an emphasis on the appeal of products, have been widely used for labels, posters, packaging materials and the like.
As a conventional high-gloss sheet-like support, a cast-coated paper is used as a printing paper. Cast coated paper is a product in which a high gloss coating layer is provided by pressing against a heated mirror surface while the coating layer containing a pigment and an adhesive as a main component is in a plastic state containing water and drying and finishing. Yes, but with insufficient gloss.

In the method of applying and drying the above-mentioned resin composition by dispersing it in water or a solvent, the larger the amount of resin applied and the faster the processing, the larger the drying and melting equipment is required. There is a problem that the installation area and heat energy required for drying and melting are increased.
Further, in a coating method using a solvent, it is necessary to recover the solvent evaporated in the drying step, but it is difficult to recover all of the solvent, which is not preferable in terms of environmental measures.

Under these circumstances, in recent years, a method of applying a non-solvent type resin using an ultraviolet curable resin or an electron beam curable resin and irradiating an ultraviolet ray or an electron beam to provide a cured layer has been partially adopted. Began to be used in the field. Such a method of curing by ultraviolet rays or electron beams does not require drying and melting equipment, has advantages such as a compact apparatus and no emission of solvent to the atmosphere. Further, since the paper is not heated, there are advantages that the processed paper is hard to curl and the dimensional stability is good.

[0006] These radiation-curable resins are used alone or as a mixture of unsaturated polyesters having a radiation-reactive group at the molecular terminal or at the molecular side chain, modified unsaturated polyesters, acrylic polymers or monomers having unsaturated bonds. used.

As a method for obtaining a smooth, high-gloss sheet-like support using such an electron beam curing technique, a method of coating a support on a smooth molded substrate, such as a metal cylindrical rotating body or a polymer film, is used. A traveling sheet-like support is bonded to a traveling nip roll through a coating liquid layer of a coating composition containing an electron beam-curable unsaturated organic compound as a main component (hereinafter, referred to as an electron beam-curable resin composition) with a nip roll. After curing by irradiation with an electron beam, a method of peeling off from the surface of a molded substrate, or applying an electron beam-curable resin composition on the surface of a running paper substrate, bonding the composition to a smooth molded substrate, curing, and then curing the molded substrate A manufacturing method that peels off from the surface is effective.

In Japanese Patent Publication No. 55-10302, a drum is pressure-bonded to a coating layer in which a resin material curable by electron beam irradiation is coated on a moving sheet-like substrate, and the electron beam is irradiated from the back of the sheet-like substrate. To cure the resin material, and then peel it off from the drum.
No. 105 and JP-A-59-206043, an electron beam-curable resin composition is applied to the surface of a drum, bonded to the surface of a sheet-like substrate, and irradiated with an electron beam from the back surface of the sheet-like substrate. In addition, techniques such as a method of curing a resin paint and then peeling the resin paint from a drum are disclosed. However, the above-mentioned publication has a problem when the sheet-like substrate and the surface of the molded substrate having a smooth surface are bonded by pressing with a nip roll through a coating liquid layer of the electron beam-curable resin composition and the problem. There was no description of a prevention method, and it was insufficient as a method for producing a highly glossy sheet-like support having smooth and good surface properties.

That is, when the pressure at the time of laminating while pressing with the nip roll is low, air is entrapped,
Oxygen in the air inhibits the curing reaction, causing the peeling from the drum surface to deteriorate, causing peeling unevenness, or the curing inhibitor adhering to the surface of the molded substrate, causing the electron beam curing of the sheet-like support after peeling. There is a problem that a concave defect called a pit occurs on the surface of the resin layer.

If the pressure of the nip roll is too high, there is a problem that the surface properties of the obtained sheet-like support are deteriorated. This is because the electron beam-curable resin composition applied to the sheet-like substrate is cured while the sheet-like substrate is distorted due to the nip pressure, and when the distortion of the sheet-like substrate is relaxed later, the electron beam-curable resin of the sheet-like support is reduced. It is considered that the layer is distorted and the smoothness is deteriorated.

[0011]

DISCLOSURE OF THE INVENTION The present invention relates to a highly glossy sheet-like support in which an electron beam-curable resin layer is provided on a sheet-like substrate. It is an object of the present invention to provide a method for producing a highly glossy sheet-like support excellent in surface smoothness by preventing such concave defects and deterioration in surface properties due to distortion of a sheet-like substrate.

[0012]

Means for Solving the Problems According to the present invention, a sheet-shaped substrate and a surface of a molded substrate having a smooth surface are caused to travel while the molded substrate is moved through a coating liquid layer of an electron beam-curable resin composition. The method for producing a high-gloss sheet-like support in which the coating liquid layer is cured by irradiating an electron beam from the back surface of the sheet-like substrate and then continuously peeling off from the surface of the molded substrate, When laminating with the surface of the molded substrate through the coating liquid layer, the rubber nip roll is pressed from the back side of the sheet-shaped substrate, and the linear pressure is 5 to 30 kg / c.
m.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the pressure for bonding a sheet-like substrate and a molded substrate surface while pressing the same with a nip roll via an electron beam-curable resin composition is 5 to 30 kg / c.
m, preferably 10 to 25 Kg / cm, makes it possible to produce a very smooth, highly glossy sheet-like support having few pits.

If the nip roll pressure is less than 5 kg / cm, air is apt to be mixed in at the time of bonding, and the oxygen in the mixed air inhibits the curing reaction at the time of electron beam curing, resulting in poor curing of the air mixed portion. It easily adheres to the surface of the molded substrate. For this reason, peeling from the molded substrate is deteriorated, and peeling unevenness and a large number of concave pits of 10 to 500 μm are generated on the surface of the high gloss sheet-like support, which impairs the appearance.

If the nip pressure is greater than 30 kg / cm,
The surface properties of the obtained high gloss sheet-like support are likely to deteriorate. This is because the sheet-like substrate is distorted by strong pressure, the coating liquid layer provided on the surface of the sheet-like substrate is cured before the distortion is relaxed and restored, and the surface property is reduced when the distortion of the sheet-like substrate is relaxed after peeling. Gets worse.

Since the highly glossy sheet-like support of the present invention has very good surface properties, the distortion of the sheet-like substrate, which has not been regarded as important in the past, greatly affects the deterioration of the surface properties. The presence or absence of surface property deterioration due to the distortion of the sheet-like substrate hardly causes a difference in the conventional glossiness (75 degrees), but the difference is visually observed. As items for evaluating the surface properties of such a high gloss, evaluation based on image clarity (JIS K 7105) and center line average surface roughness (Ra: JIS B 0601) is appropriate.

The nip pressure of a general cast-coated paper, that is, a cast-coated paper formed by pressing a coated layer containing water containing a pigment and an adhesive as main components on a heated mirror surface and drying and finishing is 30 to 40%. It is 80 kg / cm, which is higher than the nip pressure in the case of producing the high gloss sheet-like support of the present invention, increases the strain on the sheet-like substrate, and adversely affects the surface properties.

When the nip pressure is set to 30 kg / cm or less, uneven gloss and entrainment of bubbles occur in the general cast-coated paper formed by the heat drying type as described above. In an electron beam-curable high gloss sheet-like support as in the present invention, good surface properties can be obtained at a nip pressure of 5 to 30 kg / cm. The details of this difference are unknown, but in the case of the heat-drying type, a dry film starts to form at the same time as the nip and the solvent evaporates at that time. It is presumed that there is no curing reaction of the coating film at the time of nip, and that there is almost no evaporated component in the subsequent electron beam curing. It is also considered that the shrinkage of the coating film during the formation of the coating film is less affected by the formation of the coating by electron beam curing than by the formation of the dried coating.

The rubber hardness of the nip roll in the present invention is from 10 to 100 degrees, preferably from 30 to 100 degrees, more preferably from 60 to 9 degrees, according to a spring hardness test method based on JIS K6301.
5 degrees. If the rubber hardness is less than 10 degrees, a uniform linear pressure cannot be applied in the width direction at the time of pressing the nip roll, and there is a problem such as wrinkling. Adverse effects such as deterioration of the surface properties of the glass substrate. Also, when foreign matter or the like is mixed during bonding, a smooth molded substrate surface such as a metal cylindrical rotating body is easily scratched.

The material of the nip roll used in the present invention may be natural rubber, synthetic rubber such as nitrile rubber, silicone rubber, styrene / butadiene rubber, neoprene rubber, EPDM, etc. The rubber hardness can be adjusted by the composition of the monomer.

The electron beam-curable unsaturated organic compound used in the present invention is not particularly limited as long as it has a functional group which undergoes a cross-linking reaction upon irradiation with an electron beam, and can be selected according to the purpose.

For example, examples of the electron beam-curable oligomer include acrylate or methacrylate of polyester, acrylate or methacrylate of polybutadiene, acrylate or methacrylate of polyether alcohol, and acryl of polyalkyldiol. Acid esters or methacrylic esters, maleic acid or fumaric acid esters, and the like can be mentioned. These oligomers may be modified at any time, such as urethane modification, ester modification, and epoxy modification.

Generally, many electron beam-curable oligomers have a high viscosity. A high-viscosity coating composition does not provide a good coating surface, and the mixed air is difficult to escape even when pressed with a nip roll, so that defects such as pits are likely to occur. Therefore, it is necessary to dilute with a low-viscosity monomer.

Examples of such a monomer include an acrylic monomer, a methacrylic monomer, and a vinyl monomer having at least one double bond selected from an acryloyl group, a methacryloyl group, and a vinyl group in one molecule. Can be.

More specifically, monofunctional acrylic, methacrylic and vinyl monomers include styrene, N-vinylpyrrolidone, acryloylmorpholine, N-vinylcarbazole, methyl acrylate, ethyl acrylate, butyl acrylate, -Ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-
Hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate
G, isooctyl acrylate, lauryl acrylate, tetrahydrofurfuryl acrylate, methoxyethylene glycol acrylate, methoxypropylene glycol acrylate, ethyl carbitol acrylate, phenoxyethyl acrylate, cyclohexyl acrylate, cyclohexyl methacrylate, benzyl acrylate, isobornyl acrylate, ethylene oxide modified Phenoxy acrylate, N, N-dimethylaminoethyl acrylate, alkyl phenoxy polyethylene glycol acrylate, and the like.

Examples of the polyfunctional monomer include 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate,
9-nonanediol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, neopentyl glycol diacrylate, 2-
Butyl-2-ethylpropanediol diacrylate,
Bisphenol A-EO modified diacrylate, Bisphenol A-EO modified dimethacrylate, Bisphenol A-PO modified diacrylate, Bisphonol A-PO
Modified dimethacrylate, trimethylolpropane triacrylate, ethylene oxide-modified trimethylolpropane triacrylate, propylene oxide-modified trimethylolpropane triacrylate, pentaerythritol triacrylate, trisacryloxyethyl isocyanurate, dipentaerythritol tetraacrylate, dipentaerythritol penta Examples include acrylate, dipentaerythritol hexaacrylate, and caprolactone-modified dipentaerythritol hexaacrylate.

The type of the sheet-like substrate used in the present invention is not particularly limited, but is usually 50 to 300 g / m ^2.
And a paper base, synthetic paper, film, or the like can be used.

In the sheet-like substrate used in the present invention, when a sheet-like substrate having a high surface smoothness is used, when a nip roll is used for pressure bonding, less air is mixed in, or defects such as pits occur because air is easily released. This is advantageous for producing a smooth, highly glossy sheet-like support.

There are no particular restrictions on the type of paper substrate used in the present invention. The pulp forming the paper substrate is generally composed mainly of natural pulp such as softwood pulp manufactured from fir, toga, etc., hardwood pulp manufactured from maple, beech, poplar, etc., and softwood pulp mixed pulp. Is widely used, and bleached pulp such as kraft pulp, sulfite pulp and soda pulp can be used. Further, paper bases manufactured from pulp including synthetic fibers and synthetic pulp can also be used.
The paper base may contain various conventional additives such as a dry strength agent, a sizing agent, a filler, a wet strength agent, a fixing agent, and a pH.
One or more types of modifiers can be included.

The paper substrate may be treated with a treatment liquid containing one or more of a water-soluble polymer additive, a surface sizing agent, an inorganic electrolyte, a pigment, a pH adjuster, a dye, an antistatic agent, and polyvinyl alcohol as required. It may be tab-sized or size-pressed.

Further, instead of the paper substrate, a normal plastic film, polypropylene, polystyrene,
The use of a sheet-like substrate such as so-called synthetic paper in which a synthetic resin film made of polyester, vinyl chloride, etc. is made into a pseudo-paper is excellent in strength, water resistance, dimensional stability, and moisture resistance. Can be used accordingly. For example, a film formed by a melt extrusion method of a thermoplastic resin composition containing a polyolefin-based resin such as a polypropylene resin or a polyethylene resin can be used as the sheet-like substrate. In addition, plastic films used as sheet-like substrates and so-called synthetic paper include pigments such as clay, talc, kaolin, calcium carbonate, titanium dioxide, magnesium hydroxide, metal soaps such as zinc stearate, and various surfactants. One or more of a dispersant such as an agent and a colored pigment may be included.

The material of the sheet substrate used in the present invention is not particularly limited. For example, a paper substrate such as woodfree paper, clay, talc,
Pigments such as kaolin, calcium carbonate, aluminum hydroxide, titanium dioxide, magnesium hydroxide, plastic pigment, acrylic resin, polyurethane resin,
Coated paper and cast coated paper having a pigment coating layer mainly composed of a synthetic resin such as an ethylene-acrylic acid copolymer resin, a vinyl acetate-ethylene copolymer resin, a styrene-butadiene copolymer resin, and a vinylidene chloride resin. Pigment-coated paper such as art paper, lightweight coated paper, matte-coated paper, and laminated paper having one or both surfaces laminated with a polyolefin resin such as polyethylene can be used.

The sheet-like substrate used in the present invention is optionally used to prevent the penetration of the electron beam-curable resin composition to be applied or to improve the adhesiveness between the paper substrate and the electron beam-curable resin layer. To form an undercoat layer. Water-based, emulsion-based or solvent-based synthetic resins used for the undercoat layer include polyacrylates, polymethacrylates, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, polyacetal, polyvinyl acetate, polyurethane, polystyrene,
Examples thereof include polybutadiene, polyolefin, amino alkyd resin, polyvinyl alcohol, hydroxyethyl cellulose, and oxidized starch, which can be used alone or as a mixture.

Further, a pigment can be blended in the undercoat layer. As the pigment used, clay, talc, silica, calcium carbonate, satin white, lithopone, titanium oxide, zinc oxide, aluminum hydroxide and various plastic pigments can be used.

The coating amount of the undercoat layer used in the present invention is 1 to 25 g / m ² , preferably 5 to 20 g in dry weight.
g / m ² . If it is less than 1 g / m ^2, it is difficult to obtain a uniform coating film, and if it is more than 25 g / m ² , not only the effect of preventing penetration and the effect of adhesion are saturated, but also the cost may be increased.

In the present invention, the pigment used in the electron beam-curable resin composition is not particularly limited, and clay, kaolin, talc, magnesium hydroxide, aluminum hydroxide, heavy calcium carbonate, Inorganic pigments such as light calcium carbonate, magnesium carbonate, silica, titanium dioxide (anatase type and rutile type), zinc white, barium sulfate and the like, and organic pigments such as polystyrene known as plastic pigment can be used. These pigments are usually white and may be used without any treatment on the surface, but those treated with siloxane, alumina, alcohol, silane coupling agent or the like may be used. The pigment may be composed of a single kind, or may be used as a mixture of two or more kinds. Known assistants such as colorants, dyes, and preservatives may be added to the electron beam-curable resin composition containing such pigments, if necessary.

The amount of the pigment is preferably not more than 80 parts by weight, more preferably not more than 60 parts by weight, based on 100 parts by weight of the whole electron beam curable resin composition. If the amount of the pigment is more than 80 parts by weight, the viscosity of the paint may be excessively high and the fluidity may be poor.

In the present invention, in order to lighten the peeling of the high gloss sheet-like support from the molded substrate, or to provide the surface of the manufactured high gloss sheet-like support with slipperiness.
Additives such as a release aid and a lubricant can be compounded in the electron beam-curable resin composition. These additives include silicone oil, metal soap, various fatty acids and the like.

In order to disperse the pigment in the synthetic resin used in the coating material for the undercoat layer or in the electron beam-curable resin composition, a three-roll (three-roll mill), a two-roll (two-roll mill), a Cowles dissolver , A homomixer, a sand grinder, a paint conditioner, and an ultrasonic disperser.

The sheet-like support of the present invention may be a laminate in which two or more electron beam curable resin layers are applied. In this case, the electron beam-curable resin layers used for each layer may have different compositions, or may have the same composition, and an electron beam-curable resin composition suitable for the purpose can be used.

The method for forming an electron beam-curable resin layer on the surface of a sheet-like substrate according to the present invention will be further described with reference to the accompanying drawings. FIG. 1 is an explanatory view showing one embodiment of the production method of the present invention. In the coating liquid coating and curing equipment 1 shown in FIG. 1, the electron beam curable resin composition 3 is applied from a coating container 2 to a sheet-like substrate 7 running using coaters 4 a and 4 b such as a gravure coater, The coating liquid layer 7a is nip-rolled by a nip roll 8 at a nip pressure of 5 to 30 kg /
The surface of the cylindrical metal rotary body 5 for molding is adhered at a pressure of 5 cm, irradiated with an electron beam by an electron beam irradiation device 6 and cured to form a surface resin coating layer. The high-gloss sheet-like support composed of the coating layer is peeled off from the cylindrical metal rotating body 5 via the guide roll 9 to obtain the high-gloss sheet-like support 11.

The metal cylindrical rotating body used as the molding base is not particularly limited in its material shape, but is formed of, for example, stainless steel, copper, chromium, etc.
One having a mirror-finished smooth peripheral surface is used. In order to facilitate the separation between the electron beam-curable resin layer and the molded substrate, a release aid such as silicone oil or wax can be supplied to the surface of the metal cylindrical rotary member.

Even if a sheet-like material is used as the molding base, the material is not limited as long as it is smooth and flexible.
Specifically, a plastic film such as a polyester film, a metal sheet, a resin-coated paper, a metal-deposited film, a metal-deposited paper, or the like is preferable. For ease, a release aid such as silicone or wax may be supplied. Further, the surface of the sheet material may be subjected to an appropriate treatment in advance, for example, a treatment such as a silicone treatment, so that the cured electron beam-curable resin coating layer can be easily peeled off. The sheet-like material used as the molding base may be processed into an endless belt shape. The sheet-like material used as the molded base can be used repeatedly, but the repeated impacts of the electron beam deteriorate the sheet-like material, so that the number of times of repeated use is limited.

Examples of the method of applying the electron beam-curable resin composition to the surface of a sheet-like substrate or the surface of a molded substrate include a bar coating method, a blade coating method, a squeeze coating method, an air knife coating method, and a roll coating method. ,
Gravure coating method, comma coating method, smoothing coating method, microgravure coating method, reverse roll coating method, multi-roll coating method, dip coating method, kiss coating method, gate roll coating method, drop curtain coating method, slide coating method and transfer coating Any of the methods may be used. Further, a fountain coater or a slit die coater can be used.
In particular, when using the surface of a metal cylindrical rotating body as a molding substrate and applying the electron beam-curable resin composition to the molding substrate surface, in consideration of not damaging the molding substrate surface,
A roll coating method using a rubber roll for application or an offset gravure coating method is used, and a non-contact type fountain coater, slit die coater or the like is advantageously used.

[0045] In the sheet-like support according to the present invention, the coating amount of the electron beam curing resin layer is preferably from 1 to 30 g / m ^2, more preferably from 5 to 25 g / m ^2. If the coating amount is less than 1 g / m ² , defects occur in the coating film, the smoothness of the electron beam-cured resin layer surface becomes insufficient, the desired performance cannot be obtained, and the coating amount is less than 30 g / m ² . If there are many, the cost may be high.

The electron beam irradiation apparatus used for the electron beam irradiation is not particularly limited, and examples thereof include a Van de Graff type scanning method, a double scanning method, and the like.
Either a broad beam type or a curtain beam type electron beam irradiation device can be used. Among them, the curtain beam type, which is relatively inexpensive and provides a large output, is effectively used in the present invention.

The acceleration voltage during electron beam irradiation is 100 to 30.
0 kV, and the absorbed dose is 0.1 kV.
5 to 8 Mrad, preferably 1.0 to 5 Mr
ad is particularly preferred.

The oxygen concentration in the atmosphere at the time of electron beam irradiation is 1000 ppm or less, preferably 500 ppm or less. When the oxygen concentration is higher than 1000 ppm, the polymerization reaction of the electron beam-curable resin composition is inhibited by the presence of oxygen, and the curing may be insufficient. However, there is of course no problem in reducing the oxygen concentration by using an inert gas for the purpose of suppressing ozone generation due to electron beam irradiation or for cooling a window that generates heat when the electron beam passes. In addition, the type of coexisting gas and its concentration,
Alternatively, the temperature and humidity of the atmosphere are not particularly limited, and coexistence with an inert gas such as a nitrogen gas may be acceptable.

[0049]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these embodiments.

Example 1 The following electron beam-curable resin composition (composition 1) was prepared by mixing and dispersing with a Cowles dissolver at 1500 rpm for 20 minutes. Composition 1 Ingredient weight trifunctional urethane acrylate oligomer 60 parts by weight (trademark: BS-550B, manufactured by Arakawa Chemical Industries, Ltd.) 2-butyl-2-ethyl propanediol diacrylate 40 parts by weight (trademark: KU-C9A, Arakawa (Manufactured by Chemical Industry)

Preparation of Sheet-like Support A coated paper having a basis weight of 127 g / m ² (trademark: OK Royal Court, manufactured by Oji Paper) was used as a paper substrate. Using a gravure coater, the composition 1 was applied to one surface of a running paper substrate using a gravure coater so that the applied amount was 15 g / m ² to form a coating liquid layer, and the coated surface was subjected to chrome plating. Using a nip roll having a rubber hardness of 75 degrees and pressing the nip roll with a nip roll pressure of 20 kg / cm on the surface of the metal-made cylindrical rotating body thus bonded, an acceleration voltage of 280 kV and an absorbed dose of 2 Mra were applied.
Under the condition of d, the coating liquid layer was cured by irradiating an electron beam from the back surface of the paper substrate to form a surface resin coating layer, which was peeled off from the metal cylindrical rotary member to prepare a high gloss sheet-like support.

Evaluation Method The occurrence of pits on the surface of the electron beam-curable resin layer and the image clarity were evaluated as follows, and the evaluation results are shown in Table 1. Evaluation of Pits The entrainment of air was evaluated by observing the number of pits in the surface resin coating layer of the obtained high gloss sheet-like support. The surface resin coating layer surface of the sheet-like support obtained for evaluating the pits was subjected to a stereo microscope (trademark: STER).
EO DYNASCOPE MODEL TS-2: VI
(Sion Engineering Ltd.), and the number of pits having a size of 50 μm or more per 100 mm ² was evaluated. ○ and △ were practical, but × was not practical. ○: 0 to 2 △: 3 to 10 ×: 11 or more

Evaluation of image clarity To evaluate the surface properties of a high gloss sheet-like support, JIS
The image sharpness was measured using an optical comb of 2.0 mm with an image sharpness measuring device manufactured by Suga Test Instruments Co., Ltd. based on K 7105. ○ and △ were excellent in surface properties, while × was judged to be insufficient in surface properties. ○: Image sharpness of 80% or more △: Image sharpness of 65 to less than 80% ×: Image sharpness of less than 65%

Example 2 The same operation as in Example 1 was performed. However, the pressure of the nip roll was set at 7 kg / cm.

Example 3 The same operation as in Example 1 was performed. However, the pressure of the nip roll was set at 30 kg / cm.

Comparative Example 1 The same operation as in Example 1 was performed. However, the pressure of the nip roll was set at 3 kg / cm.

Comparative Example 2 The same operation as in Example 1 was performed. However, the pressure of the nip roll was set at 50 kg / cm.

[0058]

[Table 1]

When the pressure of the nip roll is 5 to 30 kg / cm in the production method according to the present invention, a highly glossy sheet-like support having no or very few pit defects and extremely high image clarity can be obtained. (Examples 1 to
3). However, when the pressure of the nip roll is lower than 5 kg / cm (Comparative Example 1), many concave defects such as pits are generated, and when it is higher than 30 kg / cm (Comparative Example 2), the image sharpness is reduced. .

[0060]

EFFECTS OF THE INVENTION The method according to the present invention makes it possible to produce a highly glossy sheet-like support having no or very few pits and excellent image clarity, which is extremely useful in practice. .

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a production method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Coating liquid application hardening equipment 2 ... Paint container 3 ... Electron beam curable resin composition 4a, 4b, 4c ... Coater 5 ... Metallic cylindrical rotating body 6 for molding ... Electron beam irradiation device 7 ... Sheet substrate 7a ... Electron beam curable resin composition coating liquid layer 8 ... Nip roll 9 ... Guide roll 10 ... High gloss sheet support

Claims (1)

[Claims] 1. A method according to claim 1, further comprising: moving the sheet-shaped substrate and the surface of the molded substrate having a smooth surface through a coating liquid layer of a coating composition containing an electron beam-curable unsaturated organic compound as a main component. Pressure-bonding, and then irradiating an electron beam from the back surface of the sheet-like substrate to cure the coating liquid layer and continuously peel off from the surface of the molded substrate. When laminating the substrate and the surface of the molded substrate via the coating liquid layer, a rubber nip roll is pressed from the back side of the sheet-like substrate, and the linear pressure is 5 to 30.
Kg / cm.