JPH08137049A - Support for photographic printing paper and its manufacture - Google Patents

Abstract

PURPOSE: To provide a support for photographic printing paper by using electron beam-curing resin to prevent generation of paper powder from both side edge parts as a surface resin-covered layer, and a manufacturing method of the support body for the photographic printing paper which is excellent in smoothness of the surface resin-covered layer and separability from a drum surface. CONSTITUTION: A surface resin-covered layer 3 and a reverse resin-covered layer 4 go over both side edges of a paper base body 2, and extend to its outside, and cover and seal both side edge parts of the paper base body 2. In a manufacturing method of a support body for photographic printing paper by a drum cast method to form the surface resin-covered layer 3 by an electron beam-curing resin composition, when the paper base body 2 and a drum are layered through an applying liquid layer, a rubber roller whose rubber hardness by a spring system hardness testing method based on JIS K 6301 is 10 to 50 degrees, is used as a nip roller.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a photographic printing paper support using an electron beam curable resin for preventing the generation of paper powder in a surface resin coating layer, and in the production of the photographic printing paper support. , A coating composition containing an unsaturated organic compound as a main component (hereinafter referred to as electron beam curing) that prevents entrapment of air between both edge portions and a metal cylindrical rotating body (hereinafter referred to as a drum) and can be cured by electron beam irradiation. (Hereinafter referred to as "resin resin composition") improves the smoothness of the surface resin coating layer and produces a support for photographic printing paper having good releasability from the drum surface after curing the electron beam curable resin composition. It is about the method.

[0002]

2. Description of the Related Art In the production of a photographic printing paper support comprising a paper base and a polyolefin resin coating layer on both sides, a photographic printing paper support free from paper dust is disclosed in JP-A-3-144.
Japanese Unexamined Patent Application Publication No. 439 and Japanese Unexamined Patent Publication No. 5-27364 disclose that both side edge portions of a sheet-shaped substrate are covered and sealed with extended portions of a resin coating layer.

On the other hand, Japanese Patent Laid-Open No. 49-45946 discloses an endless belt having a concavo-convex pattern formed by applying a radiation curable material to a plate-shaped substrate as a method for smoothing the surface of an electron beam curable resin layer. A method of curing the coating layer by irradiating it while forming an uneven pattern on the coating layer by overlapping, and peeling the belt after curing, and in JP-B-55-10302, a sheet-like substrate on a moving substrate A method in which a drum is pressure-bonded to a coating layer coated with a resin material that can be cured by electron beam irradiation, the resin material is cured by irradiating the sheet substrate with an electron beam, and then the resin material is peeled from the drum. No. 60-17105 and Japanese Patent Laid-Open No. 59-206043, an electron beam curable resin is applied to the surface of a drum, and the surface of a sheet-shaped substrate is adhered to the sheet-shaped substrate. Irradiating an electron beam from the back of the body,
Techniques such as a method of peeling from a drum after curing a resin coating material are disclosed.

However, the above publication does not describe a method for covering and sealing both side edges of a sheet-like substrate when an electron beam curable resin is used, and based on the above publication, electronic When the surface coating layer is formed from the radiation curable resin composition, air is entrained in both side edge portions of the sheet-shaped substrate, and oxygen in the air inhibits the curing reaction, so that the curing of the electron beam curable resin composition is impossible. Sufficient and the peeling from the drum surface worsens, or the adhesion between the backside resin coating layer that extends beyond the both side edges of the paper substrate and extends to the outside and the surface resin coating layer by the electron beam curable resin becomes poor. However, there is a defect that the surface resin coating layer of the electron beam curable resin is not smoothed or imprinted sufficiently.

[0005]

SUMMARY OF THE INVENTION The present invention prevents generation of paper powder from both side edges of a photographic paper support when a photographic emulsion is applied, and an electron beam curable resin is used as a surface resin coating layer. And a smoothing of a surface resin coating layer formed from an electron beam curable resin composition and a releasability from a drum surface in the production of the photographic printing paper support. It is an object of the present invention to provide a method for producing a support for photographic printing paper for the purpose of achieving the above.

[0006]

In order to prevent the above-mentioned problems in coating the photographic emulsion, the coating defects and the generation of paper powder which adversely affects the desensitization of the photographic emulsion are solved by the present inventors. In order to seal both side edge surfaces of the paper substrate and to improve the smoothness of the surface resin coating layer and the releasability from the drum surface, a sheet is formed on the drum surface via a coating liquid layer of an electron beam curable resin composition. The present invention has been completed and the present invention has been completed by using a soft rubber roll when pressing a sheet-shaped substrate.

The present invention provides a support for photographic printing paper, wherein the back side of the paper substrate has a backside resin coating layer containing a polyolefin resin as a main component, and the front surface comprises a front surface resin coating layer containing an electron beam curing resin as a main component. In the above, each of the front surface resin coating layer and the back surface resin coating layer extends to the outside beyond both side edges of the paper substrate, and the extended portions are bound to each other on the outside, As a result, both side edges of the paper substrate are covered, and the present invention is achieved.

The present invention further provides a front surface of a sheet-shaped substrate, wherein the back surface of the paper substrate is provided with a backside resin coating layer containing a polyolefin resin as a main component over both side edges of the paper substrate.
The surface of a drum having a smooth surface is pressure-bonded while rotating the drum through an application liquid layer made of an electron beam curable resin composition, and then applied by irradiating an electron beam from the back surface of the sheet-like substrate. A liquid layer is cured to form a multi-layered body composed of the sheet-shaped substrate and a coating layer bonded to the sheet-shaped substrate, and the multi-layered body is continuously peeled from the surface of the drum. A method for producing a support, wherein the rubber hardness in a spring hardness test method based on JIS K6301 is 10 to 50 degrees when the sheet-shaped substrate and the drum are laminated via a coating liquid layer. The present invention was achieved by pressing with a rubber roll.

As shown in FIG. 1, in the support 1 for photographic printing paper of the present invention, the front surface resin coating layer 3 and the back surface resin coating layer 4 formed on both front and back surfaces of the paper base 2.
Respectively extend beyond both side edges 2a of the paper base 2 to the outside thereof, and the extended portions 3c and 4c are
They are bound together on the outside. Both side edge surfaces 2a of the paper base 2 are covered and sealed by the front surface resin coating layer 3 and the back surface resin coating layer 4 which are bound to each other. In such a photographic printing paper support of the present invention, since both side edge portions thereof are not thicker than other intermediate portions,
This part can be wound up evenly without being cut off. Therefore, the photographic printing paper support of the present invention does not generate foreign matter such as paper powder and does not contaminate the photographic emulsion layer.

In the method for producing a support for photographic printing paper according to the present invention, a sheet-like substrate having a backside resin coating layer containing a polyolefin resin as a main component wider than the width of the paper substrate is used as an electron beam. When laminating via a coating liquid layer of a curable resin composition, by using a rubber roll having a rubber hardness of 10 to 50 degrees of a nip roll pressed on the surface of the drum, in the coating liquid layer and There is no entrapment of air between the front surface resin coating layer and the extension portion of the back surface resin coating layer on both side edge portions of the paper substrate, and the curability of the extension portion and the peelability from the drum are improved. be able to. When the rubber hardness of the nip roll is less than 10 degrees, when pressing with the nip roll,
Since a uniform linear pressure cannot be applied, the coating thickness distribution of the surface resin coating layer of the electron beam curable resin in the paper width direction becomes non-uniform. On the other hand, when the rubber hardness of the nip roll is greater than 50 degrees, the nip of the extended portion becomes insufficient when pressed by the nip roll, air entrapment increases, and an uncured portion of the electron beam curable resin occurs, There arises a problem that the adhesiveness between the electron beam curable resin and the polyolefin resin at the extended portion is lowered, and the peelability from the drum is also lowered. The range of the rubber hardness is 20 to 40.
More preferably, the degree is.

As the material of the rubber roll used in the present invention, natural rubber, synthetic rubber such as nitrile rubber, silicone rubber, styrene butadiene rubber, neoprene rubber, EPDM can be used, and in the case of mastication or synthetic rubber. The rubber hardness can be adjusted depending on the monomer composition.

The manufacturing method of the present invention will be further described with reference to FIGS.

FIG. 2 shows that a backside resin coating layer containing a polyolefin resin as a main component is provided on the backside of a paper substrate so as to be wider than the width of the paper substrate. After being applied wider than the width of the substrate, the nip roll 8 presses against the smooth surface of the drum 5, the electron beam irradiating device 6 irradiates the electron beam from the back surface of the sheet-shaped substrate 7, cures, and peels off from the drum. This is a method for obtaining the support 11 for photographic paper.

FIG. 3 shows that the electron beam curable resin composition 3 is applied to the surface of a smooth drum 5 wider than the width of the paper substrate, and the back surface of the paper substrate is covered with a nip roll 8 on the back surface containing a polyolefin resin as a main component. The resin coating layer is attached to a sheet-shaped substrate 7 having a width wider than that of the paper substrate, an electron beam is irradiated from the back surface of the sheet-shaped substrate 7 from an electron beam irradiation device 6, cured, and peeled from the drum 5 for photographic printing. This is a method for obtaining the paper support 11.

FIG. 4 shows the electron beam curing for the inner coating liquid layer in which the backside resin coating layer containing the polyolefin resin as the main component on the backside of the paper substrate is applied to the surface of the sheet-like substrate 11 provided wider than the width of the paper substrate. Of the inner coating liquid layer 12a made of the organic resin composition 9 and the smooth outer surface of the drum 5 are coated with the electron beam curable resin composition 3 for outermost coating liquid layer wider than the width of the paper substrate. The outermost pre-cured layer 7 irradiated with the electron beam from the 1-electron beam irradiation device 6 is pasted with the nip roll 13, and the electron beam is irradiated from the second electron beam irradiation device 14 from the back surface of the sheet-shaped substrate 11 to the drum 5. This is a method of obtaining a support 16 for photographic printing paper in which the electron beam curable resin layer is formed into two layers by peeling.

As the paper base used in the present invention, it is preferable to use a base paper made of a commonly used bleached pulp such as kraft pulp, sulfite pulp, soda pulp, such as hardwood pulp, softwood pulp and hardwood mixed softwood pulp. Can be done. Further, if necessary, base paper produced from synthetic pulp or pulp containing synthetic fibers can be used. There are no particular restrictions on the type and thickness of the paper substrate, but it is preferable that after the paper substrate is manufactured, it is compressed by applying pressure with a calendar or the like to improve the surface smoothness, and the basis weight is 80 to 250 g. / M ² , and its thickness is preferably 70 to 270 μm.

In the present invention, the base paper used as the paper substrate is provided with various conventional additives such as cationized starch,
Cationized polyacrylamide, dry strength agents such as anionic polyacrylamide, fatty acid salts, rosin,
Maleizing rosin, cationizing sizing, sizing such as reactive sizing, clay, talc, kaolin, fillers such as calcium carbonate, magnesium hydroxide, magnesium oxide, wetting such as melamine resin, epoxidized polyamide resin One or more kinds of paper strength enhancers, fixing agents such as aluminum sulfate and cationized starch, pH adjusting agents such as caustic soda and sodium carbonate may be contained.

In addition, the base paper contains a water-soluble polymer additive, a surface sizing agent, an inorganic electrolyte, a hygroscopic substance, a pigment, a pH adjusting agent, a dye, an antistatic agent, and a surface sizing agent such as polyvinyl alcohol and carboxy-modified polyvinyl alcohol. It may be tab-sized or size-pressed with a treatment liquid containing one or more species.

As the film-forming synthetic resin used for forming the backside resin coating layer of the present invention, a polyolefin resin used for producing a conventional photographic paper support can be used.

The polyolefin resin for forming the backside resin coating layer is at least a homopolymer of ethylene, α-olefins such as propylene, at least two copolymers of the above olefins, and at least these various polymers. You can choose from a mixture of the two. Particularly preferred polyolefin resin is low density polyethylene,
High density polyethylene, linear low density polyethylene, and mixtures thereof, but may include small amounts of other polyolefin resins. The molecular weight of the polyethylene resin is not particularly limited, but it is usually 20,000 to 20.
A resin having a range of 10,000 is used, and a resin having a small neck-in phenomenon is preferable. If necessary, a small amount of antioxidant and lubricant may be added to the polyethylene resin. To form the backside resin coating layer using a polyethylene resin, usual melt extrusion laminating coating can be used.

In the present invention, the coating amount of the backside resin coating layer is not particularly limited, but generally 10 to 40 g / m 2.
Used in the range of ² .

The coating solution of the electron beam curable resin composition of the present invention contains at least one unsaturated organic compound which can be cured by electron beam irradiation and, if necessary, other additives. Examples of the unsaturated organic compound that can be cured by an electron beam include (1) acrylate compounds of aliphatic, alicyclic and araliphatic monohydric alcohols and / or polyalkylene glycols (2) aliphatic and aliphatic compounds Acrylate compounds obtained by adding alkylene oxide to cyclic or araliphatic 1 to 6-valent alcohol (3) Polyacryloylalkyl phosphates (4) Reaction product of carboxylic acid, polyol and acrylic acid ( 5) Reaction product of isocyanate, polyol and acrylic acid (6) Reaction product of epoxy compound and acrylic acid (7) Reaction product of epoxy compound, polyol and acrylic acid.

More specifically, as unsaturated organic compounds that can be cured by electron beam irradiation, polyoxyethylene epichlorohydrin-modified bisphenol A diacrylate, dicyclohexyl acrylate, epichlorohydrin-modified polyethylene glycol diacrylate, 1,6- Hexanediol diacrylate, hydroxypivalate neopentyl glycol diacrylate, nonylphenoxy polyethylene glycol acrylate, ethylene oxide-modified phenoxyphosphoric acid acrylate, ethylene oxide-modified phthalic acid acrylate, polybutadiene acrylate, caprolactone-modified tetrahydrofurfuryl acrylate, tris (acrylic Roxyethyl) isocyanurate, trimethylolpropane tria Relate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate,
Polyethylene glycol diacrylate, 1,4-butadiene diol diacrylate, neopentyl glycol diacrylate, and neopentyl glycol-modified trimethylolpropane diacrylate can be used.

The present invention can use these resins alone or in combination with some of these resins.

Various pigments may be mixed in the electron beam curable resin composition applied to the paper substrate of the present invention.
Examples of this pigment include white pigments such as anatase-type or rutile-type titanium dioxide, barium sulfate, calcium carbonate, zinc oxide, aluminum oxide, magnesium oxide and magnesium hydroxide, as well as black pigments such as carbon black, lead oxide and oxides. Any of colored inorganic pigments such as chromium and organic pigments such as azo pigments and polycyclic pigments can be used. These pigments can be used alone or in combination of two or more. The content of these pigments is preferably 20 to 80% by weight of the total solid content of the surface resin coating layer.

In order to disperse the various pigments in the resin composition which is cured by the irradiation of electron beams as described above, a three-roll mill,
A two-roll mill, cowles dissolver, homomixer, sand grinder, paint conditioner, ultrasonic disperser and the like can be used.

Although the material shape of the drum used in the present invention is not particularly limited, stainless steel,
It is preferable to have a smooth peripheral surface that is mirror-finished with copper, chrome, or the like. Further, if necessary, in order to facilitate the peeling of the cured resin layer, a peeling aid such as silicone oil or wax can be applied to the surface of the drum.

In the production method of the present invention, the method of applying the electron beam curable resin composition is not particularly limited, and examples thereof include bar coating, roll coating, air doctor coating, blade coating, reverse roll coating and gravure. A roll coating method, a transfer coating method, a fountain coating method, a slit die coating method, or the like can be used. However, as a method of applying to the surface of the drum having a mirror surface, the offset gravure coating method,
The slit die coating method can be advantageously used.

In the present invention, the coating amount of the surface resin coating layer preferably has a weight of ^{2 to} 60 g / m ² (solid content).

The electron beam irradiation apparatus used in the present invention is not particularly limited in its method. For example, an electron beam irradiation apparatus such as a Van de Graaff scanning method, a double scanning method, and a curtain beam method can be used. Among these, the curtain beam type, which is relatively inexpensive and can obtain a large output, is effectively used.

The acceleration voltage during electron beam irradiation is 100 to 30.
It is preferably 0 KV. The absorbed dose of the electron beam may be any one capable of subjecting the unsaturated organic compound to the desired curing, and the value thereof is not particularly limited, but it is generally preferably 0.1 to 6 Mrad, 0.2-4
Mrad is particularly preferred. When the absorbed dose is less than 0.1 Mrad, curing of the resin by electron beam irradiation becomes insufficient. If the absorbed dose exceeds 6 Mrad, the paper support may be deteriorated or discolored by the impact of an electron beam, and energy consumption is wasted.

The oxygen concentration in the atmosphere during electron beam irradiation is preferably 500 ppm or less. When the oxygen concentration exceeds 500 ppm, oxygen inhibits the curing reaction of the electron beam curable resin composition, resulting in insufficient curing. However, in the case of the present invention, in the case of electron beam irradiation after pasting the coating film on the drum surface and the sheet-like substrate, the electron beam curable resin composition does not come into direct contact with air during electron beam irradiation. Therefore, it is not necessary to particularly reduce the oxygen concentration in the atmosphere during electron beam irradiation, but for the purpose of suppressing ozone generation due to electron beam irradiation, or for the purpose of cooling windows that generate heat when the electron beam passes through. There is of course no problem in using an inert gas such as nitrogen, argon or carbon dioxide.

[0033]

The present invention will be described in more detail with reference to the following examples, which, of course, do not limit the scope of the present invention.

Example 1 One side of a paper substrate having a basis weight of 180 g / m ² was subjected to surface activation treatment by corona discharge, and then a polyethylene resin was extrusion coated to form a backside resin coating layer of 30 g / m ² on the paper substrate. A sheet-like substrate was prepared by being provided so as to protrude in the width direction by a width of about 2 cm from both ends.

Then, the following electron beam curable resin composition (composition 1) comprising an unsaturated organic compound and a white pigment was prepared. Composition 1 Component Composition Amount Pentaerythritol oligomer 80 parts by weight (Trademark: Beamset 710, manufactured by Arakawa Chemical Industry) Titanium dioxide (Trademark: A220, manufactured by Ishihara Sangyo) 20 parts by weight

An electron beam curable resin composition was prepared by mixing and dispersing the mixture of the above components with a paint conditioner for 1 hour. A method for producing this composition 1 as shown in FIG.
That is, by using an offset gravure coater on a paper substrate on the opposite surface of the sheet-shaped substrate on which the backside resin coating layer is not applied, it is wider than the width of the paper substrate so that the coating amount after curing is 30 g / m ^2. , Is applied so as to be narrower than the application width of the backside resin coating layer, and is pressed against the chrome-plated drum surface using a nip roll having a rubber hardness of 30 degrees, and then while rotating the drum, from the back surface of the support, An accelerating voltage of 300 KV and an absorbed dose of 2 Mrad were applied to cure the resin by irradiating it with an electron beam to form a surface resin coating layer, which was peeled from the drum to prepare a support for photographic printing paper.

After forming the surface resin coating layer, the releasability of the coating film from the drum, the release sound and the state of the residual coating film on the drum were evaluated. ○: No peeling noise and no residual coating film △: Somewhat high peeling noise, no residual coating film ×: High peeling noise, many residual coating film

The air entrainment evaluated the adhesiveness of the surface state of the drum after peeling and the electron beam cured surface resin coating layer. ○ is good ○ to △ is slightly good △ is slightly bad × is bad

The surface of the sheet-like material obtained in order to evaluate the pits was covered with a stereo microscope (trademark: STERE).
O DYNA SCOPE MODEL TS-2: V
It was observed with ISION ENGINEERING LTD) to evaluate the number of pits per 10 mm ² . ○ is 0 to 2 △ is 3 to 10 × is 11 or more

The uniformity of the nip in the paper width direction was evaluated by the uneven coating amount and the state of pit formation. ○ is good ○ to △ is slightly good △ is slightly bad × is bad

For the generation of paper powder, a black and white photographic emulsion (trade name: Liquid Light, manufactured by Rockland Colloid Co., Ltd.) was coated on the surface resin coating layer, and defects on the emulsion layer surface were evaluated. ○ is good ○ to △ is slightly good △ is slightly bad × is bad

Example 2 Example 1 except that the rubber hardness of the nip roll was 45 degrees.
It carried out similarly to.

Example 3 Composition 1 was prepared by the method shown in FIG. 3, that is, a reverse coater was used on the drum surface, and the coating amount after curing was 25 g.
/ M ² wider than the paper width, and press the sheet-shaped substrate with the backside resin coating layer with a nip roll to form a surface resin coating layer of electron beam curable resin on the surface without backside resin coating layer After bonding as described above, the same method as in Example 1 was performed except that electron beam irradiation was performed.

Example 4 Composition 1, which is the production method shown in FIG. 4, was applied onto a drum so that the weight after curing was 5 g / m ^2, and the accelerating voltage was 1
The sheet-like substrate provided with the backside resin coating layer was cured by irradiation with an electron beam under the conditions of 50 KV and an absorbed dose of 3 Mrad, and the following electron beam curable resin composition (composition The coating film coated with the item 2) is pressed, and the acceleration voltage is 300 KV and the absorbed dose is 2 M from the back surface of the sheet substrate.
A support for photographic printing paper having a two-layer surface resin coating layer was obtained by the same method as in Example 1 except that the production was carried out by irradiating with an electron beam under the condition of rad to cure and then peeling.

Composition 2 Composition Content Amount of urethane acrylate oligomer 36 parts by weight (Trademark: Beamset 550B, manufactured by Arakawa Chemical Industry) 24 parts by weight ethyl carbitol acrylate Titanium dioxide (trademark: A220, manufactured by Ishihara Sangyo) 40 parts by weight

Comparative Example 1 The same operation as in Example 1 was performed. However, a nip roll having a rubber hardness of 7 degrees was used.

Comparative Example 2 The same operation as in Example 1 was performed. However, a nip roll having a rubber hardness of 65 degrees was used.

Comparative Example 3 The procedure of Example 1 was repeated except that both ends of the paper substrate were not coated and sealed with the backside resin coating layer and the front surface resin coating layer of the electron beam curable resin.

[0049]

[Table 1]

[0050]

The support for photographic printing paper of the present invention prevents paper dust generated from both side edges, which is a problem when applying a photographic emulsion, and is extremely useful in manufacturing the support for photographic printing paper. It is effective for. Further, in the production of the photographic printing paper support of the present invention, the nip roll used in the drum,
By using a rubber roll having a rubber hardness of 10 to 50 degrees according to a spring hardness test method based on JIS K 6301, the smoothness of a surface resin coating layer formed of an electron beam curing resin is improved and peeling from the drum surface is achieved. It has excellent properties and is extremely effective in practical use in the production of a support for photographic printing paper.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a state of both side edge portions of a resin coating layer in a support for photographic printing paper of the present invention.

[Explanation of symbols]

 1 Support for Photographic Paper 2 Paper Substrate 3 Surface Resin Coating Layer 4 Backside Resin Coating Layer

FIG. 2 is a method for manufacturing a sheet-shaped substrate coating type drum cast.

[Explanation of symbols]

1 Coating layer curing equipment 2 Paint container 3 Electron beam curable resin composition 4a, 4b, 4c
Coating head 5 Drum 6 Electron beam irradiation device 7 Sheet substrate 8 Nip roll 9 Guide roll 10 Coating liquid layer 11 Support for photographic paper

FIG. 3 Method for manufacturing on-drum type drum cast

[Explanation of symbols]

1 Coating Layer Curing Facility 2 Paint Container 3 Electron Beam Curable Resin Composition 4a, 4b Coating Head 5 Drum 6 Electron Beam Irradiating Device 7 Sheet Substrate 8 Nip Roll 9 Guide Roll 10 Coating Liquid Layer 11 Support for Photographic Paper

FIG. 4 is a method for manufacturing a drum cast having a two-layer surface structure.

[Explanation of symbols]

1 Coating Layer Curing Equipment 2, 8 Paint Container 3 Outermost Coating Liquid Layer Electron Beam Curable Resin Composition 4a, 4b, 10a, 10b, 10c Coating Head 5 Drum 6 First Electron Beam Irradiator 7a Outermost Coating Liquid Layer 7 Outermost pre-cured layer 9 Electron beam curable resin composition for inner coating liquid layer 11 Sheet-shaped substrate 12a Inner coating liquid layer 12 Inner cured layer 13 Nip roll 14 Second electron beam irradiation device 15 Guide roll 16 For photographic printing paper Support

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location B05D 7/24 301 T 7415-4F B32B 27/10 9349-4F 27/32 Z 9349-4F C08F 2 / 46 MDT D21H 19/20 19/24

Claims (2)

[Claims] 1. A support for photographic printing paper, wherein the back side of a paper substrate has a backside resin coating layer containing a polyolefin resin as a main component, and the front surface comprises a front surface resin coating layer containing an electron beam curing resin as a main component. Each of the front surface resin coating layer and the back surface resin coating layer extends beyond both side edges of the paper substrate to the outside thereof, and the extended portions are bound to each other on the outside, whereby A support for photographic printing paper, characterized in that both edges of the paper base are covered. 2. A metal cylinder type having a smooth surface and a surface of a sheet-like substrate provided with a back surface resin coating layer containing a polyolefin resin as a main component on the back surface of the paper substrate over both side edges of the paper substrate. The surface of the rotating body is pressure-bonded while rotating the metallic cylindrical rotating body through a coating liquid layer composed of a coating composition containing an unsaturated organic compound that is curable by electron beam irradiation as a main component, and then the sheet. A method for producing a support for photographic printing paper by irradiating an electron beam from the back surface of a sheet-like substrate to cure the coating liquid layer and continuously peeling it off from the surface of a metal cylindrical rotary member, wherein When laminating the base body and the metal cylindrical rotary body via the coating liquid layer, pressing is performed with a rubber roll having a rubber hardness of 10 to 50 degrees in a spring hardness test method based on JIS K6301. Photo printing paper Manufacturing method of the support.