JPS63123041A - Container for photosensitive band material - Google Patents

Abstract

PURPOSE:To uniformize the thickness of adhesive layers of a base fabric which is a light shielding teremp cloth by laminating a specific multi-layer co-extruded film on the base fabric. CONSTITUTION:The multi-layer co-extruded film 11 consists of the adhesive layer 12 consisting of an ethylene copolymer contg. 5-36% comonomer and a base layer 13 consisting of a thermoplastic resin having the m.p. higher by >=10 deg.C than the m.p. of the layer 12 and >=15kg/mm<2> Young's modulus and the tensile strength of said film is specified to >=500g/15mm width. The light shielding teremp cloth consists of fluffy pipes 8a and many short looped piles 9a randomly formed on the base fabric 1a. For example, the film 11a consisting of the layers 12a, 13a formed by adding a light shielding material to the layers 12, 13 is laminated via the adhesive agent layer 10 on the base fabric 1a. The layer 12a is adhered to a container body 7. Then, the thickness of the layer 12a is uniformed and, therefore, the stable adhesive strength and light shielding property are obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the packaging of photosensitive strips such as rolled photographic paper and photographic frames, and more particularly to the packaging of photosensitive strips such as rolled photographic paper and photographic frames, and more particularly to packaging under sunlight and indoor lighting. This invention relates to a light-shielding container in which a terrestrial cloth is provided at the outlet of a photosensitive strip for loading under light.

[Conventional technology]

Various forms of photosensitive strip containers have been disclosed. For example, Utility Model Publication No. 55-88980, Utility Model Publication No. 56
-16608, JP 55-124140, JP 57-128333, JP 59-36
No. 736, JP-A-60-156058, U.S. Pat. No. 4,148,395, U.S. Pat. No. 4,17
No. 9,028, US Pat. No. 4,272,035, and the like.

In this way, a light-shielding member is generally provided at the part of the photosensitive strip container from which the strip-shaped photographic light-sensitive material is pulled out for the purpose of preventing light from entering the light-shielding container and exposing the strip-shaped photographic light-sensitive material inside the container. It is being

There are various types of light shielding members, but those made of cloth as an internal material are called terremp cloth.

Conventionally, there was a type of terempu cloth whose side cross section is shown schematically in Fig.
Publication No. 0539). This terempu cloth is a ground cloth with a woven structure.
It is formed by weaving pile yarn 4 into the fabric. As shown in the schematic plan view of FIG. 14, the ground fabric 1 is formed by weaving warp threads 2 and weft threads 3, and the pile threads 4 are made of flexible yarns such as viscose or acetate. Coreless pile yarn that has been crimped is used.

To create such a cloth, the ground warp and warp 2.3
Generally, the pile warp 4 is woven into a double velvet to form a double velvet, which is then cut.

However, in the case of light-shielding terempu cloth with a woven structure, also known as velvet weave or velvet weave, which is made by weaving such pile threads etc. into the ground fabric, fraying and pile loss may occur during the process of making the shading terempu cloth. However, the production process was complicated and production costs were high.

Furthermore, when a strip of photographic light-sensitive material is assembled into a photosensitive strip container and pulled out or rolled up, friction with the surface of the strip of photographic light-sensitive material may cause fraying or shedding of the pile, and the resulting debris may damage the photosensitive film of the strip of photographic light-sensitive material. It could stick and cause problems. Especially when used at the outlet of a light-shielding container for rolled color photographic paper loaded with indoor light, the photosensitive film made of gelatin swells and becomes sticky under high temperature and high humidity conditions, resulting in piles adhering to the photosensitive film. Met.

Therefore, conventionally, the ground fabric 1 is impregnated with a solution filler and then dried to form a sealing layer 5.
was fixed. Then, a heat-sealable solution adhesive layer 6 was applied to this sealing layer 5 and attached to the outlet of the container body 7.

[Problem that the invention seeks to solve]

By the way, in the conventional light-shielding terempu cloth, it was necessary to increase the fiber density of the base fabric in order to prevent the pile yarns from being impregnated in the process of applying and impregnating a solution filler. Therefore, there is a problem in that the cloth used for the light-shielding terempu cloth must be a very expensive velvet cloth that uses a large amount of thread.

In addition, a solution adhesive is applied to the sealing layer 5 to form an adhesive layer 6.
However, the coating thickness varies due to unevenness of the base fabric 1, the rate of impregnation of the adhesive, non-uniform fiber density of the base fabric, etc., and the adhesive strength with the container body 7 may become unstable. , if it contains light-blocking substances, the difference in light-blocking properties may become large, or
There were various problems such as uneven sushi and wrinkles. This also applies to the case of applying a hot melt adhesive layer.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a photosensitive strip container using a light-shielding thermoplastic cloth that is inexpensive and has a uniform adhesive layer thickness.

[Means for solving problems]

In order to achieve the above object, the present invention has a structure in which a multilayer coextruded film having an ethylene copolymer resin adhesive layer and a thermoplastic resin base layer is laminated on a base fabric, and the multilayer coextruded film is bonded to a container body. This is what I did.

That is, the photosensitive strip container of the present invention has a core around which the photosensitive strip is wound into a roll, an outlet from which the photosensitive strip is pulled out, and a light-shielding terrestrial cloth provided at the outlet. In the light-shielding container, an ethylene copolymer resin adhesive layer with a comonomer content of 5 to 36% is provided on the base fabric of the light-shielding terempu cloth, and a Young's modulus of 15 kg with a melting point 10°C or higher than that of the ethylene copolymer resin adhesive layer. /+n'' or more thermoplastic resin base layer, and a multilayer coextruded film having a tensile strength of 500 g/15 m or more is laminated.

The ethylene copolymer resin adhesive layer is used for adhering the ground cloth to the main body of the light-shielding container made of paper, plastic, or metal. This ethylene copolymer resin adhesive layer is made of EEA resin (ethylene-ethyl acrylate copolymer resin), HMA resin (ethylene-methyl acrylate copolymer resin) from the viewpoint of the balance between heat sealability and blocking with paper, plastic, or metal. ), EVA resin (ethylene-vinyl acetate copolymer resin), EAA resin (ethylene-vinyl acetate copolymer resin)
Preferred are acrylic acid copolymer resin), EMAA resin (ethylene-methacrylic acid copolymer resin), and the comonomer content must be 5 to 36%.

If the comonomer content is less than 5%, it is difficult to heat seal the light-shielding container body made of paper, plastic, or metal, and if the comonomer content exceeds 36%, the light-shielding container body made of paper, plastic, or metal will be difficult to heat-seal. Although the heat sealability is good, blocking occurs and it cannot be put to practical use.

Further, it is preferable to add a light-shielding substance to the ethylene copolymer resin layer in order to ensure light-shielding properties and prevent static electricity, and it is particularly preferable to add 0.1 to 20% by weight of carbon black.

The thermoplastic resin base layer prevents wrinkles and creases when forming the multilayer coextruded film and laminating it onto the base fabric.
This is to ensure tensile strength, prevent curling, and prevent uneven thickness. This thermoplastic resin base layer has a melting point higher than that of the ethylene copolymer resin layer by 10'C or more.

This is prepared by laminating the multi-layer coextruded film of the present invention on a light-shielding terrestrial cloth, cutting it to the size used, and then heat-sealing it to the outlet of the photosensitive strip. For this reason, unless the melting point is at least 10° C. higher than the ethylene copolymer resin layer which is the heat seal layer, peeling between the eyebrows will occur and the light-shielding terempu cloth will peel off, making it difficult to ensure light-shielding properties.

Moreover, this thermoplastic resin base layer has a Young's modulus of 15k.
g7m" or more.

If the Young's modulus is less than 15 kg/mm, tension is applied to the multilayer coextruded film when it is laminated on the light-shielding thermoplastic cloth, but wrinkles and creases occur at this time, and the tension causes the multilayer coextruded film to stretch. This results in non-uniform light-shielding properties and film thickness, making it difficult to put it into practical use.

Such a thermoplastic resin base layer is a polyolefin resin such as a polyethylene resin or a polypropylene resin to which a light-shielding substance, preferably a carbon blank, is added, and in particular, L to which 0.3% to 15% by weight of carbon black is added.
DPR resin, L-LDPE resin, MDPE resin, HDP
E resin or a mixed resin containing 50% by weight or more of these resins is preferable in terms of film formability, prevention of blocking, improvement of Young's modulus of the film, prevention of wrinkles during lamination, prevention of film surface deterioration, etc.

A multilayer coextruded film having an ethylene copolymer resin adhesive layer and a thermoplastic resin base layer as described above is laminated on a base fabric. As long as this multilayer coextruded film has the above two layers, it may be a coextruded film of three or more layers having other layers or the same layer. In addition, the multilayer coextruded film has a thickness in the range of 30 to 150 μm and a total content of light blocking substances of 0.3 to 30 g/n (
It is preferable that Various methods can be used to adhere the multilayer coextruded film to the base fabric, but in terms of ensuring the flexibility of the light-shielding terremp cloth and production efficiency, the unicit lamination method, dry lamination method, and extrusion lamination method are recommended. preferable.

Further, this multilayer coextruded film must have a tensile strength of 500 g/15 fin width or more.

Regardless of the film thickness, if the tensile strength of the multilayer coextruded film is less than 500 g for a 15 mm width, it will be difficult to manufacture because it will break, wrinkle, or crease when laminated on a light-shielding telescope cloth.

Various synthetic resin fibers and natural fibers can be used for the fibers forming the light-shielding terempu cloth, but the fibers have low hygroscopicity, are difficult to deform, and must be made so that the cut surface does not fray, as is the case with heat slitting, ultrasonic slitting, etc. It is preferable to use polyester fibers or polyamide fibers that can be melt-cut, have good heat setting properties after raising, and have high physical strength. In addition, a knitted structure is preferable because it prevents hair from being pulled out and improves productivity.

For example, fabrics made of raised knits (fleece knits), circular knits, flat knits, and other flat knit stockinettes into loop-shaped piles, tricots & I knits, raschel knits (including double raschel knits), Milanese knits, etc. These are fabrics made by raising warp knitted stockinette into loop-shaped piles, and sinker pile fabrics made using a circular knitting pile knitting machine that directly forms stockinette having loop-shaped piles.

The above-mentioned light-shielding thermoplastic cloth is provided at the outlet of the light-shielding container for the photosensitive strip material.

Photosensitive strip materials include color photographic paper, photoresist, computer microfilm, computer phototypesetting paper, and JIS
It includes all strip-shaped photosensitive strips such as 135 type photographic film (Leica film). The light-shielding containers include all containers that have a structure in which a photosensitive strip wound in a roll around a core is stored and the photosensitive strip is pulled out from an outlet. Examples include microfilm for computers, light-shielding containers for computer typesetting photographic paper, color photographic paper, and JIS 135 type photographic film cartridges.

[For production]

In the photosensitive strip container of the present invention, the ethylene copolymer resin adhesive layer provides stable adhesion to the container body, and the thermoplastic resin base layer prevents the multilayer coextruded film from being cut or wrinkled during lamination. This prevents the occurrence of streak defects and prevents the fabric from wrinkling, sagging, curling, etc.

〔Example〕

Embodiments of the light-shielding terremp cloth for the photosensitive strip container according to the present invention will be described with reference to FIGS. 1 to 8.

The light-shielding terempu cloth shown in FIG.
A large number of short loop-shaped piles 9a are randomly placed on the ground cloth 1a.
A multilayer coextruded film 11a is laminated on the base fabric 1a via an adhesive layer 10. This two-layer coextruded light-shielding film Ila is formed of an ethylene copolymer resin adhesive layer 12a and a thermoplastic resin base layer 13a, both of which contain a light-shielding substance.

The light-shielding terremp cloth shown in FIG. 2 is the same as the light-shielding terremp cloth shown in FIG. 1, except that an ethylene copolymer resin adhesive layer 12 containing no light-shielding substance is used.

The light-shielding thermoplastic resin cloth shown in FIG. 3 is the same as the light-shielding thermoplastic resin cloth shown in FIG. 1 except that a thermoplastic resin base layer 13 containing no light-shielding substance is used.

The light-shielding terremp cloth shown in FIG. 4 is the same as the light-shielding terremp cloth shown in FIG. 1, except that an ethylene copolymer resin adhesive layer 12 and a thermoplastic resin base layer 13, both of which do not contain a light-shielding substance, are used. .

The light-shielding thermometer cloth shown in FIG. 5 is the light-shielding thermometer cloth shown in FIG. Same as cloth.

The light-shielding thermoplastic cloth shown in FIG. 6 is laminated with a multilayer coextruded film lla consisting of three layers: a thermoplastic resin base layer 13a and ethylene copolymer resin adhesive layers 12a, 12a formed on both sides of the thermoplastic resin base layer 13a. It is the same as the light-shielding terremp cloth shown in FIG.

The light-shielding terempu cloth shown in FIG. 7 has a multilayer coextruded film lla laminated thereon, which is made up of three layers including a thermoplastic resin base layer 13a and an ethylene copolymer resin adhesive layer 12a with an intermediate layer 15 in between. It is the same as the light-shielding terremp cloth shown in FIG.

The light shielding thermoplastic cloth shown in FIG. 8 consists of two thermoplastic resin base layers 13a, 13a and an ethylene copolymer resin adhesive layer 1.
It is the same as the light-shielding terremp fabric shown in FIG. 1, except that a multilayer coextruded film lla consisting of three layers of 2 is laminated.

Examples of photosensitive strip containers using the above-mentioned light-shielding thermoplastic cloth are shown in FIGS. 9 to 12.

FIG. 9 does not show an example of a light-shielding container for a strip-shaped photographic material, which is applied to color photographic paper, computer typesetting photographic paper, and the like. In this figure, the light-shielding container body 7 is made of metal, plastic, paper, or the like.

At the corner of this light-shielding container main body 7 is an outlet (bottom) 18.
is formed, and light-shielding telescope cloth 19 is provided on both the upper and lower sides of this outlet. Inside the core 2, a photosensitive strip 20 such as color photographic paper, computerized typesetting paper, microfilm, etc. as a strip-shaped photographic light-sensitive material is wound in a roll.
1 is provided.

FIG. 10 shows an example in which the photosensitive strip container shown in FIG. 9 is sealed with a moisture-proof film 22 in order to further ensure product protection, moisture-proofing properties, and, if necessary, light-shielding properties. The moisture-proof film 22 is formed of a film having moisture-proof properties and, if necessary, light-shielding properties, such as a laminated film of an aluminum vacuum-deposited thermoplastic resin film layer and a heat-sealing layer, or a thermoplastic resin blown film.

The light-shielding container main body 7 is sealed with the sealing portion 23 by heat sealing or the like.

FIG. 11 shows an example of a JIS 135 type photographic film cartridge, which is a photosensitive strip container intended for JIS 135 type photographic film. In this figure, reference numeral 24 denotes a cartridge main body, and two plates projecting from the cartridge main body 24 with a small gap are formed to form a drawer opening 25. A light-shielding thermometer cloth 19 is provided on both sides of the outlet 25, and a plastic core (spool) 27 on which a JIS 135 type photographic film 26 is wound in a roll is provided inside.

FIG. 12 shows an example of a simple light-shielding container for photosensitive strips. As shown in the exploded perspective view of FIG. 12(a), this simple light-shielding container has side plates 29 on both sides of the light-shielding container body 7.
is attached to the winding core holding shaft 3 formed on this side plate 29.
0 is loosely fitted into the core 21. And Fig. 12fb)
As shown in FIG. 2, the light-shielding container main body 7 and the side plate 29 are fixed with a sealing tape 31.

Next, Table 1 shows the experimental results comparing the characteristics of the product of the present invention and the conventional product.

The evaluation in the table is based on the following.

◎Very excellent.

○ Excellent.

・Within practical limits.

Mu　Needs improvement, there are problems.

× Not practical.

The test method is as follows.

A: Judging from fraying on the cut surface, pile cutting debris, and loose pile when the color photographic paper is pulled out after being left at a temperature of 30°C and humidity of 80% RH for 12 hours.

B: After forming the sealing layer or sealing adhesive layer on the base fabric of the light-shielding terempu cloth, 24 hours later, the pile portion was visually and visually inspected and judged.

C: Cost ratio of light-shielding terempu cloth when the cost of conventional processing is set as 100.

D: The uniformity of the adhesive layer thickness was examined and determined by cross-sectional cutting.

E: Deformation such as wrinkles, creases, curls, etc. of paper made by laminating a light-shielding terempu cloth with an adhesive layer is visually determined.

〔Effect of the invention〕

As described above, the present invention provides an adhesive layer that adheres the base fabric to the container body by laminating a multilayer coextruded film having an ethylene copolymer resin adhesive layer and a thermoplastic resin base layer on the base fabric of the light-shielding terempu cloth. Since the thickness can be made uniform, it has stable adhesive strength, light-shielding properties, etc., does not suffer from deformations such as wrinkles, curls, and curls, and can be provided at low cost.

[Brief explanation of the drawing]

FIGS. 1 to 8 are cross-sectional views of representative embodiments of the light-shielding terremp fabric used in the photosensitive strip container of the present invention. 9-12 are perspective views of embodiments of photosensitive strip containers according to the present invention. FIGS. 13 and 14 are schematic diagrams showing conventional light-shielding terempu cloth. 1.1a... Ground fabric, 7... Container body, 8a... Fuzzy pile, 9a... Looped pile, 10... Adhesive layer, 11a... Multilayer coextruded film, 12 .1
2a...Ethylene copolymer resin adhesive layer, 13,132
... Thermoplastic resin base layer, a... Indicates that it has light-shielding properties.

Claims (1)

[Claims] In a light-shielding container having a core around which a photosensitive strip is wound into a roll, an outlet from which the photosensitive strip is pulled out, and a light-shielding terremp cloth provided at the outlet, a base fabric of the light-shielding terremp cloth is provided. , an ethylene copolymer resin adhesive layer having a comonomer content of 5 to 36%, and a thermoplastic resin base layer having a melting point 10° C. or higher and a Young's modulus of 15 kg/mm^2 or higher than the ethylene copolymer resin adhesive layer. and has a tensile strength of 500g/
A photosensitive strip container characterized by laminating a multilayer coextruded film with a width of 15 mm or more.