JPH0833613B2 - Buffer sheet for photosensitive sheet packaging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a light-sensitive photosensitive sheet, for example, a sheet-shaped X-ray photographic film, lith film, direct positive color photosensitive material, photographic paper, PS plate, heat-sensitive sheet. The present invention relates to a buffer sheet body for a photosensitive sheet package used in a magazine for feeding a developing photosensitive material, a photosensitive resin film, etc. by a vacuum suction mechanism. In particular, the present invention relates to a buffer sheet body for a photosensitive sheet package used in a system in which a sheet-shaped X-ray photographic film, lith film or the like is loaded in a photographing device, an image recording device or the like under a bright room.

[Conventional technology]

Conventionally, in order to feed out the photosensitive sheets stored in the magazine, the photosensitive sheets have been sucked out one by one using a vacuum suction mechanism and taken out. However, with this method, the suction plate continues to suck the bottom of the magazine with the photosensitive sheet gone, and the vacuum pump and the like provided in the suction system are damaged. Therefore, various proposals have been made to prevent damage to the vacuum pump and the like.

For example, there was a sheet-shaped photosensitive material storage magazine proposed in Japanese Utility Model Publication No. 50-127378. This magazine is provided with a groove-like recess for air leakage that does not penetrate the bottom of the magazine at a position where the suction plate at the bottom of the magazine comes into contact, so that the atmosphere is allowed to flow into the suction system, such as a vacuum pump of the suction system. It prevents damage.

There is also a sheet-shaped photosensitive material storage magazine proposed in Japanese Utility Model Publication No. 56-1624. This magazine is composed of a member having a relatively small unevenness on the surface or a member having hairs implanted on the surface, which has a size not completely included in the suction surface of the suction disk at the position where the suction disk contacts the bottom of the magazine. Intake air leakage means is provided.

Further, as shown in FIG. 15, a protective backing paper 1 having a projecting hole 20 formed at a position where it comes into contact with the suction disk is used, and the protective backing paper 1 is used to store the paper in a magazine (actually, as shown in FIG. (Kaisho 56-7931 gazette, actual Kaisho 56-40535 gazette).

[Problems to be Solved by the Invention]

However, a magazine provided with the first groove-shaped recess requires a lot of man-hours to manufacture the magazine and is expensive, and after the groove-shaped recess, not only uneven density occurs on the photosensitive sheet but also scratches occur. was there.

In the magazine provided with the second intake air leaking means, pressure rise occurs on the photosensitive sheet due to the rise of the intake air leaking means, and the intake air leaking means is peeled off or the adhesive sticks out to the photosensitive sheet. There are problems such as adhesion, fogging due to residual solvent and volatile components, and increase / decrease in photosensitivity.

When these magazines are used, a protective backing made of paperboard or the like is used in the process of transporting the photosensitive sheet, and the photosensitive sheet is rubbed or scratched due to vibration during transportation. Fogging due to moisture and gas in the inside, fibers on the surface of the paperboard detached and adhered to the photosensitive sheet, and development inhibition and spot failure occurred.

The third type that stores a photosensitive sheet in a magazine through a perforated protective paper, uses a highly rigid paperboard or synthetic resin sheet as the protective paper, so the trace of perforation may cause pressure fog. There is a problem in that fibers generated or separated from the surface or perforated scraps generated from perforated portions adhere to the photosensitive sheet, resulting in development inhibition or spot failure.

Further, since this protective backing paper is used in the package of the photosensitive sheet, there is a problem that the traces of the perforations are generated as pressure fog even during the transportation of the photosensitive sheet.

The present invention solves the above problems and provides a cushioning sheet body for a photosensitive sheet package in which pressure fog or scratches do not occur on the photosensitive sheet while preventing damage to the vacuum pump of the vacuum suction mechanism. With the goal.

[Means for solving the problem]

The present invention has been made in order to achieve the above object, and is a protective paper used with a package of a photosensitive sheet which is designed to be delivered by a sheet material transfer device having a vacuum suction mechanism and a sheet material transfer mechanism. And a photosensitive sheet, wherein the cushioning sheet body is formed on the contact portion of the suction plate of the vacuum suction mechanism in a concavo-convex shape on the side opposite to the suction plate and is foamed. A cushioning sheet body for a photosensitive sheet packaging body, comprising a foamed sheet having a magnification of 2 to 50 times.

The cushioning sheet body for the photosensitive sheet package (hereinafter, simply referred to as a cushioning sheet) is for contacting the photosensitive sheet and preventing fogging due to moisture, gas, pressure, friction or the like on the contacting photosensitive sheet. .

The non-contact surface side of the suction plate of the buffer sheet body is formed in an uneven shape. The side of the suction plate opposite to the contact side is the side opposite to the side in contact with the photosensitive sheet, that is, the side in contact with the protective paper. Then, this surface is formed in an uneven shape. The unevenness is intended to prevent the vacuum pump from being damaged by the leakage of intake air from the perforated portion, and at the same time, to provide the cushioning property to prevent pressure fog and the like. Therefore, various shapes can be used as long as they can provide a cushioning property, such as a ridge shape, a braid shape, a satin shape, and a lattice shape.

For forming the uneven surface, the cushioning sheet itself has a foaming ratio of 2 to
It may consist of only 50 times the foam sheet,
In addition to laminating a flexible sheet layer on a foamed sheet with a foaming ratio of 2 to 50 times (hereinafter simply referred to as a foamed sheet), the unevenness of the foamed sheet appears on the surface, and embossing roll processing is performed during buffer sheet molding. There is also a case where the heat treatment is performed or after the buffer sheet is formed.

When the foamed sheet is used as it is for the cushioning sheet, the unevenness has an interval of 0.2 to 1 cm and a depth of 50 μm to 1 mm. In the embossing roll processing and the hot press processing of the flexible sheet that constitutes the cushioning sheet body, both the interval and the depth of the unevenness are 20 to 4500 μm.

Further, the cushioning sheet body of the present invention comprises a foamed sheet having a foaming ratio of 2 to 50 times. This is an indispensable condition for ensuring the buffering property such that the perforated portion and the uneven portion do not cause frictional fog, pressure fog and scratches on the photosensitive sheet.

The adsorbed air leakage passage is composed of a hole or a recess. This perforation may be completely included in the suction surface of the suction cup when there is a space between the backing paper and the buffer sheet body, but in the case where the protective backing paper and the buffer sheet body are entirely adhered, , It must not be completely contained in the adsorption surface and a part of it must be located outside the adsorption surface. Any shape such as a circle, a triangle, a square, a rectangle, a flower shape, a slit shape, a star shape, and a meandering slit shape can be used as the shape of the perforations.

Like the perforations, the recess may have any shape, but it must be formed so that it is not completely included in the suction surface of the suction plate and a part thereof is located outside the suction surface. In short, regardless of whether it is a hole or a recess, it is sufficient that the suction plate communicates with the atmosphere through some path and the atmosphere flows into the suction plate.

This buffer sheet is a foamed sheet such as various polyethylene resins and various polypropylene resins, polyolefin resins such as polybutene resin, ethylene-propylene copolymer resin, ethylene-butene copolymer resin, ethylene-vinyl acetate copolymer resin. , Ethylene-acrylic ester copolymer resins and other ethylene-based copolymer resins, chlorinated polyethylene resins and other ethylene-based copolymer resins, propylene-based copolymer resins, or polyamide resins. Etc. The above-mentioned one or more kinds of mixed resin, polyurethane, natural rubber (sponge-like one produced from undiluted latex of rubber), SBR and the like are formed into a sheet using a foaming agent.

Preferred foam sheets to which the present invention can be effectively applied include polystyrene resin, various high density, medium density, low density polyethylene resins and linear low density polyethylene (L-LDPE).
It is a thermoplastic resin foamed sheet containing a resin, a polypropylene resin, a propylene / ethylene copolymer resin, an ethylene / vinyl acetate copolymer resin, and an ethylene / acrylic ester copolymer resin as a main component.

In particular, expanded polystyrene sheet (expanded polystyrene paper) and expanded polyethylene sheet are preferable in terms of cost and characteristics.

It should be noted that the thermoplastic resin includes denatured, cross-linked, and radiation-irradiated resins.

The expansion ratio of the foamed sheet has a great influence on dust resistance, cushioning property, slipperiness, and mechanical strength, so it is selected according to the application of the product, but it is in the range of 2 to 50 times. When it is 50 times or more, the strength of the foamed sheet itself is largely reduced, which causes delamination when laminated with another flexible sheet film. When the amount is less than 2 times, the impact resistance and the cushioning property are lowered, the other properties also lose the effect as the foamed sheet, and the cost is close to that of a general non-foamed film.

Even if the cushioning sheet body is a single layer of a foamed sheet having a foaming ratio of 2 to 50 times, a low dust-generating flexible sheet or paper such as various thermoplastic resin films, cellophane, glassine paper, synthetic paper or the like is added to the foamed sheet. It may be a laminated buffer sheet formed by laminating non-woven fabric or the like, or a laminated buffer sheet formed by multilayer coextrusion. In particular, it is preferable to provide a dust-free, antistatic, and moisture-proof flexible sheet layer on the surface in contact with the photosensitive sheet because it is possible to prevent dust adhesion and fogging due to static electricity. Further, it is preferable to use paper, a non-woven fabric, a foamed sheet or the like for the center layer of the cushioning sheet in terms of preventing curling and imparting cushioning properties.

In the case of a foamed sheet having a synthetic resin foamed sheet on its surface, it is preferable that the expansion ratio of the foamed sheet of the surface layer is less than 2 times for dust prevention (prevention of dust generation).

Also, the thickness of the cushioning sheet is 100μ to ensure cushioning.
It is preferably at least m, particularly preferably at least 300 μm, most preferably at least 500 μm.

In order to form the cushioning sheet body by laminating the various flexible sheets, for example, a thermal bonding method (a hot plate bonding method, a flame treatment bonding method, a hot air heating bonding method, an impulse bonding method, an ultrasonic bonding method) or an adhesive is used. The method (wet laminating method, dry laminating method, hot melt laminating method, extrusion laminating method, coextrusion laminating method) or the like is used.

As typical adhesives, various polyethylene resins, polypropylene resins, polyolefin thermoplastic resins such as polybutene resins, ethylene-propylene copolymer resins, ethylene-vinyl acetate copolymer resins, ethylene-
There are thermoplastic resin heat-melting type adhesives such as ethyl acrylate copolymer resin, ethylene-acrylic acid copolymer resin, and ethylene-copolymer resin such as ionomer resin, and other heat-melting type rubber adhesives. Further, as the solution adhesive, there is a wet laminate type adhesive, which is an emulsion type or latex type adhesive. A typical example of the emulsion type adhesive is polyvinyl acetate resin,
Vinyl acetate-ethylene copolymer resin, vinyl acetate resin and acrylic ester copolymer resin, vinyl acetate resin and maleic ester copolymer resin, acrylic acid copolymer resin, ethylene-acrylic acid copolymer resin, etc. There is an emulsion. Typical examples of latex type adhesives include natural rubber, styrene butadiene rubber (SBR), acrylonitrile butadiene rubber (NBR), chloroprene rubber (C
R), etc. are rubber latex. Further, as the dry laminate type adhesive, there is a polyurethane adhesive or the like. Other known adhesives such as hot-melt laminated adhesives, pressure-sensitive adhesives, and heat-sensitive adhesives blended with paraffin wax, microcrystalline wax, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, etc. Agents can also be used. The polyolefin resin adhesive for extrusion lamination is
More specifically, in addition to various polyethylene resins, polypropylene resins, polyolefin resins such as polybutylene resins and ethylene copolymers (EVA, EEA, EMA, EAA, etc.) and resins, other than ethylene such as L-LDPE resins. Copolymerized with some other monomer (α-olefin), Dupont
The company also includes ionomer resins (ion copolymer resins) such as Surlin from Mitsui Polychemical Co., Ltd. and Himiran from Mitsui Polychemical Co., Ltd., and ADMER, which is an adhesive polyolefin resin from Mitsui Petrochemical Co., Ltd.

In the present invention, it is possible to use any sheet-like protective paper. However, from the viewpoint of ensuring the quality of the photosensitive sheet and protecting it, it is preferable that the thickness of the protective paper is 200 μm or more, and the raw paper made of semi-bleached or bleached pulp or a synthetic resin sheet is used. Especially neutral paper or pH 5-8
Paper of (1) or paper of low dust generation or polyolefin resin sheet is preferable.

The surface shape of the protective backing paper may be smooth, uneven lines may be formed in parallel, or silk and other unevenness may be embossed. Further, it may be perforated.

In particular, when the protective paper and the cushioning sheet are not completely adhered to each other, air is easily sucked into the suction cup through the perforations of the cushioning sheet through the gaps of the unevenness.

As the shape of the protective backing paper, any shape that can use the suction cup can be used. For example, JP-A-59-52244
No. 59-86518, No. 59-31950, No. 59-3
Protective papers disclosed in Japanese Patent Laid-Open Nos. 1951, 59-34535 and 56-40535.

Various additives can be contained in the buffer sheet and the protective paper.

Typical examples of the additives are described below, but the present invention is not limited thereto and can be selected from all known ones.

In order to wrap the photosensitive sheet using the buffer sheet body as described above, the photosensitive sheets are stacked on the protective paper through the buffer sheet body, and stored in the moisture-proof light-shielding bag in this state,
Alternatively, the cushioning sheet body is directly stored in the magazine for the photosensitive sheet in a state where the cushioning sheet body is located at the bottom, and is packaged. Then, when stored in the moisture-proof light-shielding bag, the moisture-proof light-shielding bag is opened and the photosensitive sheet is stored in the magazine with the buffer sheet body positioned at the bottom, and in this state, the photosensitive sheet is used by using the vacuum suction mechanism. Take out. The cushioning sheet body and the protective backing paper may be integrated, partially adhered with an adhesive tape or an adhesive, or the cushioning sheet body may simply be placed on the protective backing paper.

[Action]

In the buffer sheet body for a photosensitive sheet package of the present invention, the suction plate of the vacuum suction mechanism is communicated with the atmosphere in the suction air leakage passage to prevent the vacuum pump from being damaged, and the unevenness on the non-contact surface side Cushioning property is provided to prevent pressure fog and scratches from occurring even when a large pressure is applied to the photosensitive sheet.

〔Example〕

An embodiment of the buffer sheet body for a photosensitive sheet package of the present invention will be described with reference to the drawings, but is not limited thereto.

FIG. 1 is a perspective view of a photosensitive sheet packaging body using a buffer sheet body.

In this figure, reference numeral 1 is a protective backing paper, and this protective backing paper 1 is formed by folding a board of 450 μm in thickness into a substantially “U” shape with a short side on the upper side and a long side on the lower side. Is. The cushioning sheet body 2 is placed on the bottom surface of the protective paper 1 so as to cover substantially the entire surface.

This buffer sheet body 2 has three perforations 3 as adsorbed air leakage passages in the vicinity of both short sides, and the concavities and convexities connected to these perforations are on the opposite contact surface side of the suction plate, that is, on the protective paper side. No matter what state the cushioning sheet body 2 is placed on, either the perforation 3a on the one side or the perforation 3b on the other side is always in the position where the suction cup contacts. . This perforation 3 has a circular shape and its diameter is
It is 30 mm.

On the upper surface of the cushioning sheet body 2 for the photosensitive sheet packaging body, the photosensitive sheets 4 are stacked in a state of being partially surrounded by the protective backing paper 1.

Then, the photosensitive sheet 4, the buffer sheet body 2 for the photosensitive sheet package, and the protective backing paper 1 are covered with a moisture-proof light-shielding bag 5.

FIG. 2 is a perspective view of another embodiment of the photosensitive sheet packaging body using the buffer sheet body for the photosensitive sheet packaging body.

In this example, the protective backing paper 1 is formed of a box-shaped paperboard having a thickness of 450 μm and having one side surface and an upper surface continuing from the one side surface.

The cushioning sheet body 2 for the photosensitive sheet packaging body is placed on the protective paper 1 as in the example of FIG. 1, but two perforations 3 as adsorbed air leakage passages are formed in the vicinity of both long sides. No matter what state the cushioning sheet body 2 is placed, either the perforation 3a on the one side or the perforation 3b on the other side is always in the position where the suction cup contacts.

FIG. 3 is a perspective view of another embodiment of the buffer sheet body for the photosensitive sheet package. In the buffer sheet body 2 for the photosensitive sheet package shown in this figure, elongated holes 6b as adsorbed air leakage passages are formed in the vicinity of both sides.

FIG. 4 is also a perspective view of another embodiment of the buffer sheet body for the photosensitive sheet package. In the cushioning sheet body 2 for the photosensitive sheet package shown in this figure, perforations 3b as adsorbed air leakage passages are formed only near one end.

FIG. 5 and FIG. 6 are partial cross-sectional views showing the use state of the cushioning sheet body 2 for the photosensitive sheet package and the protective backing paper 1.
In each case, a space H is formed on the side of the paper for protection to secure the leakage of intake air.

FIG. 5 shows a cushioning sheet body for a photosensitive sheet package having irregularities (hereinafter referred to as a cushioning sheet body) 2 laminated on the irregular surface side of a foamed sheet 10 with a flexible sheet 11a having a light shielding property via an adhesive layer 12. On the other side, the light-shielding HDPE resin film layer 13a and the light-shielding L are provided on the opposite side through the adhesive layer 12.
A light-shielding two-layer coextrusion film layer 15a composed of an LDPE resin film layer 14a is laminated.

FIG. 6 uses a light-shielding buffer sheet body 2a in which a flexible sheet layer 11a having a light-shielding property is laminated instead of the two-layer coextrusion film layer 15a having a light-shielding property shown in FIG.

7 to 14 are partial cross-sectional views showing an example of the layer structure of the cushioning sheet body.

The cushioning sheet body 2 in FIG. 7 is composed of only the foam sheet 10.

In the light-shielding buffer sheet body 2a of FIG. 8, a flexible sheet layer 11a having a light-shielding property is directly laminated on the surface of the foam sheet 10.

In the light-shielding buffer sheet body 2a shown in FIG. 9, a flexible sheet layer 11a having a light-shielding property is laminated on a foamed sheet 10 via an adhesive layer 12a having a light-shielding property.

In the light-shielding buffer sheet body 2a of FIG. 10, a flexible sheet layer 11a having a light-shielding property is laminated on both sides of a foamed sheet 10 with an adhesive layer 12 interposed therebetween.

The light-shielding buffer sheet body 2a of FIG. 11 is a light-shielding two-layer structure including a light-shielding HDPE resin film layer 13a and a light-shielding L-LDPE resin film layer 14a on the side of the foamed sheet 10 in contact with the photosensitive sheet 5. A coextrusion film layer 15a is laminated with an adhesive layer 12 in between.

The light-shielding buffer sheet body 2a of FIG. 12 is a light-shielding two-layer coextrusion film layer 15a composed of a light-shielding HDPE resin film layer 13a and a light-shielding L-LDPE resin film layer 14a on both sides of the foam sheet 10. Are laminated via the adhesive layer 12.

In the cushioning sheet body 2 shown in FIG. 13, a biaxially stretched thermoplastic resin film layer 17 in which an aluminum vacuum deposition film 16 is formed is laminated on a foam sheet 10 with an adhesive layer 12 interposed therebetween.

The cushioning sheet body shown in FIG. 14 is a light-shielding foam sheet 10a having a low foaming ratio and two layers of a foaming sheet 10b having a high foaming ratio arranged on the side in contact with the protective paper 1 on the side in contact with the photosensitive sheet film. It is composed of a co-extruded foam sheet having two layers of the same property.

Next, the experimental results comparing the characteristics of the present invention products I, II, III, the comparative product I, and the conventional product I will be described.

Inventive Product I The photosensitive sheet package corresponds to FIG. 1, and the layer structure of the buffer sheet 2 corresponds to FIG.

The void sheet layer 10 is a foamed polyethylene sheet having a thickness of 1 mm and an expansion ratio of 30 times. The HDPE resin film layer 13a having a light-shielding property is an HDPE resin containing 3% by weight of carbon black and 0.05% by weight of an oleic acid amide lubricant, and has a thickness of 25 μm.
Is formed. The L-LDPE resin film layer 14a having a light-shielding property is made of a copolymer resin of ethylene and 4-methylpentene-1 having a thickness of 25 .mu.m containing 3% by weight of carbon black and 0.05% by weight of an oleic acid amide lubricant. . The adhesive layer 12 is made of LDPE resin and has a thickness of 15 μm. The distance between the concave and convex shapes on the non-contact side of the suction cup is about 0.
The depth is 6 cm and the depth is about 600 μm.

As shown in FIG. 1, three perforations 3 of the cushioning sheet body 2 are provided in the vicinity of both short sides, that is, three in a circular shape having a diameter of 30 mm symmetrically in the U-shaped direction of the protective paper 1. .

Protective paper 1 has a thickness of 400 μm made from bleached pulp.
It is made of paperboard.

The moisture-proof shading bag is made of carbon black 3 with a 15 μm thick LDPE resin adhesive layer on both sides of a 7 μm thick aluminum foil.
The L-LDPE resin film layer having a thickness of 50 μm and added with 0.1% by weight of an oleic acid amide lubricant is laminated.

The buffer sheet 2 is not fixed to the protective patch 1 and is arranged between the photosensitive sheet 4 and the protective patch 1 in a free state.

The product II of the present invention corresponds to the protective paper 1 of the photosensitive sheet package as shown in FIG. 2, and the layer structure of the buffer sheet 2 and the interval and depth of the uneven shape on the non-contact surface side of the suction cup are the same as those of the product I of the present invention. It is the same.

As shown in FIG. 2, two perforations 3 of the cushioning sheet body 2 are formed in a circular shape having a diameter of 30 mm.

The protective paper 1 and the moisture-proof light-shielding bag 5 are the same as the product I of the present invention.

The buffer sheet 2 is not fixed to the protective patch 1 and is arranged between the photosensitive sheet 4 and the protective patch 1 in a free state.

The product II of the present invention The protective paper 1 for the photosensitive sheet packaging body corresponds to FIG. 2, the cushioning sheet body 2 corresponds to FIG.
Corresponds to Figure 13.

The foamed sheet 10 is a foamed polyethylene sheet having a thickness of 0.5 mm and a foaming ratio of 20 times. The aluminum vapor deposition film layer 16 is formed to have a thickness of 400Å. Biaxially stretched film layer 17,
It is made of polyester resin and has a thickness of 15 μm. The adhesive layer 12 is made of LDPE resin and has a thickness of 15 μm. The adhesive layer 12 is made of LDPE resin and has a thickness of 15μ.
It is formed in m. The distance between the concave and convex shapes on the non-contact surface side of the suction cup is 0.3 cm and the depth is 300 μm.

The slit 6 of the cushioning sheet body 2 has a width as shown in FIG.
It is 3 mm long and 17 cm long.

The protective paper 1 is formed of a polypropylene resin sheet having a thickness of 200 μm.

Incidentally, the cushioning sheet body 2 is arranged in a free state like the products I and II of the present invention.

Comparative product I The cushioning sheet body 2 has the same layer structure as that of the product II of the present invention, and although it has perforations, the non-contact surface side of the suction cup is formed flat.

The moisture-proof, light-shielding bags 5 of the products I to III of the present invention and the comparative product I are made of aluminum having a thickness of 50 μm and a 4-methylpentene-1 copolymer resin film layer containing carbon black of 3% by weight and having a thickness of 7 μm. LDPE with a thickness of 15 μm on both sides of the foil
A laminated film was used which was laminated via a resin extrusion laminate adhesive layer.

Conventional product I Protective paper 1 has a thickness of 450 μm made by combining bleached pulp.
Of the paperboard, and four perforations are provided as shown in FIG. 15 (the buffer sheet 2 for the photosensitive sheet package of the present invention is not used). The moisture-proof light-shielding bag 5 is made of a 7 μm thick LDPE resin film layer containing 3% by weight of carbon black, a 7 μm thick aluminum foil and a bleached kraft paper with a basis weight of 35 g / m ^{2 and} a 15 μm thick LDPE resin extrusion. It is laminated through a laminate adhesive layer.

In the above, as the photosensitive sheet 4, a sheet-shaped X-ray photographic film was used, and 150 sheets each were packaged in the moisture-proof and light-shielding bag 5.

 The experimental results are shown in Table 1.

The evaluation is as follows.

◎… Excellent ○… Excellent ●… Practical limit ▲… Problem, need improvement ×… Not practical * A Scratch-preventive property X-ray photographic film is packed 150 sheets, 5 boxes in cardboard After inserting (750 sheets), a vibration test according to JIS Z-0232 was performed. Judged from scratches on sheet-shaped X-ray photographic film.

* B Compression resistance 150 sheets of sheet-shaped X-ray photographic film are packed, and a sheet weighing 5 kg is left on this cardboard box for a period of 2 weeks. After that, development processing is applied and density changes due to pressure (fog). )
Inspect.

* C Moisture fog A comparison test was performed using the same method as in B above for the fog caused by water permeation through the opening provided on the protective paper.

* D Rubbing fog A sheet of X-ray photographic film that has undergone the A test is developed and inspected for changes in density.

* E Intake air leakage property Even if the photosensitive sheet from which all the photosensitive sheet material has been discharged is exhausted, it is inspected whether the completion of taking out the photosensitive sheet can be accurately detected by the intake air leakage without damaging the suction system.

* F Dust prevention property A package containing 150 sheets of X-ray photographic film is placed in a cardboard box, which is placed in 5 boxes in a cardboard box, and a vibration test according to JIS Z-0232 is performed, followed by processing with a bright room loading device. Judged from the number of spots generated due to development inhibition due to dust adhesion on the sheet-shaped linear photographic film.

〔The invention's effect〕

According to the present invention, since the buffer sheet body for the photosensitive sheet packaging body is configured as described above, pressure fog, friction fog, scratches, etc. occur on the photosensitive sheet while maintaining the damage prevention of the vacuum pump of the vacuum suction mechanism. Can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a photosensitive sheet package using the cushioning sheet body of the present invention, and FIG. 2 is a perspective view of another embodiment of the same. FIG. 3 and FIG. 4 show typical slits and examples of perforations 3, which are one of the adsorbed air leakage passages of the cushioning sheet body. FIG. 5 and FIG. 6 are typical partial cross-sectional views showing the use state of the cushioning sheet body 2 and the protective backing paper 1. 7 to 14 are partial cross-sectional views showing the layer structure of the cushioning sheet body 2 of the same as above, and FIG. 15 is a perspective view of a protective paper. 1 ... Protective paper 2, 2a ... Buffer sheet for photosensitive sheet packaging 3 ... Perforation 4 ... Photosensitive sheet 5 ... Shading bag 6 ... Slit 10, 10a ... Expansion ratio is 2-50 Double foam sheet 11, 11a …… Flexible sheet layer 12, 12a …… Adhesive layer 13, 13a …… HDPE resin film layer 14, 14a …… L-LDPE resin film layer 15, 15a …… Multi-layer coextrusion film layer 16 ...... Metal thin film 17, 17a ...... Biaxially stretched thermoplastic resin film layer H ...... Space of irregularity forming part a ...... Indicates that it has a light shielding property.

Claims (1)

[Claims] 1. A buffer arranged between a protective backing paper and a photosensitive sheet, which is used with a package of a photosensitive sheet which is supplied by a sheet material transfer device having a vacuum suction mechanism and a sheet material transfer mechanism. A sheet body, wherein the buffer sheet body is provided with at least one adsorbed air leakage passage communicating with a non-contact surface side of the suction plate at a contact portion of the suction plate of the vacuum suction mechanism, A cushioning sheet body for a photosensitive sheet packaging body, characterized in that the contact surface side is formed in a concavo-convex shape and a foaming sheet having a foaming ratio of 2 to 50 times is provided.