JPH07225453A - Light shielding container for photosensitive material - Google Patents

Abstract

PURPOSE:To obtain a light shielding container for photosensitive materials which is low in cost, has excellent light shieldability and strength and satisfies performance as a disposable material, such as combustible material by using a molding mixture composed of cellulose fibers and thermoplastic resin. CONSTITUTION:A magazine is formed by using a corrugated fiberboard which is subjected to black solid printing on both surfaces by a gravure system as the material of a body 1 and using various kinds of materials as side plates 2. A photosensitive material 3 to be housed into this magazine is photographic paper for a computerized type setting system. The molding mixture composed of at least the cellulose fibers and the thermoplastic resin is used for at least a part of the members constituting the container for housing the photosensitive material in a light shielding state in such a manner. Various kinds of additives, for example, inorg. pigments, such as carbon black, org. pigments, light shieldable materials, such as light shieldable cellulose fibers, lubricants, etc., may be arbitrarily added to such mixture composed of the cellulose fibers and the thermoplastic resin. The purposes are attained as well by the cellulose fibers and the thermoplastic resin alone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding container for a light-sensitive material which contains a light-sensitive material in a light-shielded state, and more particularly to a simple disposable container.

[0002]

2. Description of the Related Art Light-shielding containers for light-sensitive materials come in various forms depending on the purpose and application. For example, the actual exploitation 55-88
No. 980, No. 60-167796, and Jitsusho Sho 5
6-16608, JP-A-55-124140, JP-A-57-128333, and JP-A-60-15605.
8 gazette, 61-219040 gazette, and 62-24.
No. 0958, Japanese Patent Publication No. 59-36736, etc., magazines for roll-shaped photosensitive materials (hereinafter referred to as magazines), Japanese Utility Model Publication No. 63-66825, No. 63-
There is a film unit with a lens described in Japanese Patent No. 94438.

It is needless to say that these light-shielding containers for light-sensitive materials have light-shielding properties and strength, but from the viewpoint of disposable use, it is necessary to consider manufacturing costs and environmental problems at the time of disposal.

The magazine is made of various materials depending on the type, size, winding length, and application of the photosensitive material to be stored, but it can be generally classified into paper and plastic. Specifically, as the paper, corrugated board, paperboard or a laminated material of paper and a plastic film or metal foil is used.

FIG. 1 is a partially disassembled perspective view of a general magazine. The material of the magazine is usually divided into one in which both the body 1 and the side plate 2 are formed of paper, one in which both are formed of plastic, or one in which the body is formed of paper and the side plate is formed of plastic. .

It is almost impossible for the conventional magazines formed of these papers and / or plastics to satisfy all of the strength, low cost and waste incineration property imposed on the disposable magazine as described above.

For example, when the body and the side plate are formed of paper, the cost and the disposability are good, but the strength is weak, the size of the photosensitive material to be stored and the winding length are limited, and deformation occurs during transportation. However, it has a serious drawback that it is easily damaged. The one in which both are molded from plastic has good strength, but there are problems in terms of cost and disposal. Although the body is made of paper and the side plate is made of plastic, it has the intermediate characteristics of the above two examples, but at the time of disposal, the body and side plate must be removed and the paper and plastic must be separated and discarded. There is a drawback that it takes a lot of effort to remove the.

However, from the standpoint of maintaining the commercial value as a light-sensitive material, the mainstream is one in which plastic is used for the side plates in order to give the magazine a certain level of strength. The side plates of the magazine must be strong enough to rotatably support the core wound in a roll with the photosensitive material stored in the magazine, and must be processed to have a roll loosening prevention function. For some reason, plastics have come to be generally used because they have relatively complicated irregularities in the structure of the side plate and require dimensional stability and moldability.

However, plastic itself does not have a light-shielding property, and it is necessary to mix a light-shielding substance such as carbon black in order to have a light-shielding property, and the shrinkage rate after the molding process is large, and the molding process is difficult. Work efficiency and lack of dimensional stability of large-sized molded products and deformation due to heat absorption, resulting in defective assembly of magazines, poor light-shielding properties, defective drawing of photosensitive materials, etc. And, since plastic is handled as an incombustible material, it must be separated from the paper member and discarded.If mixed with combustible material and incinerated, the burning calorie of plastic is considerably higher than that of paper, wood, etc. Further, since plastic has a property of melting down (melting and dropping) at the time of combustion, it has a drawback of damaging a combustion furnace.

[0010]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, to provide a low cost, excellent light-shielding property and strength,
Another object of the present invention is to provide a light-shielding container for a light-sensitive material, which has satisfactory properties such as flammability as a disposable product.

[0011]

SUMMARY OF THE INVENTION The above object of the present invention is to provide a container for storing a light-sensitive material in a light-shielded state, in which at least a part of the members constituting the container is a mixed molding of at least a cellulosic fiber and a thermoplastic resin. Was achieved by using

The light-shielding container for the light-sensitive material in the present invention is not particularly limited, but specifically, there are the above-mentioned roll-shaped light-sensitive material magazine and the film unit with lens, and more specifically, it is a simple disposable container.

Various additives, for example, inorganic pigments such as carbon black, organic pigments, light-shielding substances such as light-shielding cellulose fibers, lubricants, etc. are optionally added to the mixture of the cellulosic fibers and the thermoplastic resin in the present invention. However, the object of the present invention can be sufficiently achieved with only the cellulosic fiber and the thermoplastic resin.

Various natural pulps can be used as the cellulosic fibers, but from the viewpoint of strength, not only softwood or hardwood but unbleached pulp is preferable. In terms of economy and environment, kraft waste paper, cardboard waste paper, waste paper such as newspapers and magazines can be used.

The thermoplastic resin is not particularly limited, but in consideration of the environmental property at the time of disposal, which is one object of the present invention, a polyethylene resin, a polypropylene resin, a polyester resin or the like which does not generate a toxic gas during incineration is preferable. .

The mixing ratio of the cellulosic resin and the thermoplastic resin is not particularly limited, but the mixing ratio of the cellulosic fibers is preferably 20 to 70% by weight in view of injection moldability, strength, hardness and calories burned. , Especially 30-6
0% by weight is preferred. In particular, in order to enable handling as a combustible material, it is preferable to suppress the burned calories to 8000 cal / g or less.

The method for producing a mixed molded product composed of a cellulosic fiber and a thermoplastic resin is not particularly limited,
A known method can be used. For example, pulp or waste paper is crushed with a shearing machine, then further disentangled into finer fibers with a defibration machine, and the cellulosic fibers and thermoplastic resin thus obtained are thoroughly mixed at a temperature equal to or higher than the softening point of the thermoplastic resin. Then, injection molding is performed into a desired molded product.

As a mixture of a cellulosic fiber and a thermoplastic resin, there is XY (Zai: trade name) manufactured by Showa Marube Co., Ltd., which can be preferably used in the light-shielding container for the light-sensitive material of the present invention.

A mixed molded product composed of a cellulosic fiber and a thermoplastic resin is far superior in light-shielding property to plastic, and when used as a side plate of a magazine, the side plate molded of a conventional plastic is made of carbon black or the like. A light-shielding substance must be mixed, but if the mixture has a thickness of the side plate of the magazine (1 mm or more), sufficient light-shielding property can be obtained without mixing the light-shielding substance.
Even when the thickness of the member formed of the mixture is small, the amount of the light-shielding substance added can be significantly smaller than that when plastic is used.

Compared with plastics, the mixed moldings of cellulosic fibers and thermoplastic resins have a significantly lower shrinkage ratio after injection molding, so that the efficiency during molding can be improved (cooling time shortened), Since the stability is good and the deformation is small, defective assembly of the magazine, defective light-shielding due to distortion, and defective drawing of the photosensitive material can be greatly improved. There is also an advantage that the design of the mold of the molded product is easy.

Further, since the mixed molded product composed of the cellulosic fibers and the thermoplastic resin contains the fibrous material, it has a good entanglement with the adhesive, the adhesiveness is improved as compared with the plastic, and the molded product with other members such as the body of paper. Joining becomes easy, and the strength of the joining portion can be increased.

In terms of environmental friendliness, the mixed molded product composed of cellulosic fibers and thermoplastic resin has a significantly lower calorific value than plastic and is close to paper or wood, and therefore can be handled as a combustible material. Therefore, conventionally, dismantling the paper body of the magazine and the plastic side plate, which were firmly joined together, required a great deal of labor and cost, but this is no longer necessary.

In the present invention, the mixed molded product composed of the cellulosic fiber and the thermoplastic resin may be used as a part of the light-shielding container for the light-sensitive material or may be used as a whole.
In particular, it is preferable to use it for a member that requires a certain level of strength and hardness due to the structure of the light-shielding container, and by using a plastic material instead of a plastic material, the effect can be maximized. .

In the case of a magazine, for example, the side plate is generally required to have strength, hardness, dimensional stability, light-shielding property and moldability as described above. Therefore, a mixed molded product of cellulosic fiber and thermoplastic resin is used for the side plate. By using paperboard or cardboard for the body, it is possible to satisfy the suitability as a disposable magazine. Of course, there is no problem even if a mixed molded product composed of a cellulosic fiber and a thermoplastic resin is used for the body.

Similarly, even if the above-mentioned mixed molded product is used for the body of the film unit with lens, etc., the same effect as described above can be exhibited.

[0026]

EXAMPLES The present invention will be described in detail below with reference to examples.

FIG. 1 is a partially disassembled perspective view of the general roll-shaped photosensitive material magazine as described above. The body 1 is made of 1.5 mm thick corrugated board with black solid printing on both sides by gravure method, and the side plate 2 has a thickness of 1.7.
Magazines were made using various materials in mm. The photosensitive material 3 housed in the magazine is a computer printing paper having a width of 12 inches and a winding length of 150 feet.

With respect to these various magazines,
The strength, magazine assembly suitability, cost, and environmental suitability were investigated.
The results are shown in Tables 1 and 2.

Kraft waste paper was used as the cellulosic fibers used in the first and second inventions.

Test methods for light-shielding property, strength and suitability for magazine assembly are shown below.

<Light-shielding property> The fog property when the magazine was exposed at 1000 lux for 24 hours was examined.

<Drop Test> A drop test was conducted in accordance with JIS-Z0202 in a state where six magazines were packed in an A-flute cardboard box.

<Vibration test> Similar to the drop test, with the A flute cardboard box filled with 6 magazines, J
A vibration test was performed according to IS-Z0232.

<Magazine Assembling Suitability> The occurrence rate of defective products (defective light-shielding property, deformation, defective extraction of photosensitive material) of the completed magazine by joining the body and the side plate with an automatic assembling machine was examined.

[0035]

[Table 1]

[0036]

[Table 2]

[0037]

The light-shielding container for a light-sensitive material of the present invention uses a mixture molded product of cellulosic fibers and a thermoplastic resin. Therefore, it can be used as a light-shielding container for a light-sensitive material formed of conventional paper and / or plastic. In comparison, the light-shielding property can be obtained without adding a light-shielding substance such as a black pigment.

Further, since the shrinkage rate after the molding process is low and the molded product is hardly deformed, the assembling property of the magazine is greatly improved.

Further, the magazine has improved strength because it has a bending strength equal to or higher than that of plastic and has good adhesiveness.

Further, the cost can be reduced as compared with the case where the plastic is used.

Further, in terms of environmental friendliness, it has been difficult to dispose of plastics in the past, but the product of the present invention can be disposed of as a general combustible material, and when burned, dripping development occurs like a general resin. It was possible to achieve the purpose as a product that is kind to the global environment without damaging the furnace.

[Brief description of drawings]

FIG. 1 is a partially disassembled perspective view of a general magazine for rolled photosensitive materials.

[Explanation of symbols]

 1 Body 2 Side plate 3 Photosensitive material 4 Photosensitive material outlet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidemi Kato 3-4-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Paper Co., Ltd. (72) Takashi Shimazu 3-4-2 Marunouchi, Chiyoda-ku, Tokyo Ryo Paper Co., Ltd.

Claims (2)

[Claims] 1. A container for storing a light-sensitive material in a light-shielded state, wherein at least a part of the member constituting the container is a mixed molding of at least a cellulosic fiber and a thermoplastic resin. Light shielding container for. 2. The light-shielding container for a light-sensitive material according to claim 1, wherein at least a side plate is for a roll-shaped light-sensitive material formed of the mixed molded product.