JP2003186151A - Outer packaging body of injection-molded article for photographic sensitive material and method for regenerating resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make easily obtainable a regenerated resin without lowering the photographic performance of a photographic film housed in comparison with a new one. <P>SOLUTION: A photographic film is housed in the unit body 3 of a film unit 2 with a lens. The unit body 3 includes a front cover 6 and a rear cover 7 as cover members. A sheetlike outer packaging label 4 is stuck in such a way that it extends over the front cover 6 and the rear cover 7. The front cover 6 and the rear cover 7 have been injection-molded from a polystyrene resin. The label 4 comprises a polypropylene resin as a base material and titanium dioxide or calcium carbonate mixed to whiten the resin. A porous resin material having high gas adsorbing power is used as the polypropylene resin. The weight proportion of the label 4 is 0.5-10% of the total weight of the front cover 6, the rear cover 7 and the label 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer casing of an injection-molded article for a photographic light-sensitive material and a resin recycling method.
The present invention relates to a resin recycling method capable of efficiently obtaining a recycled resin from an injection-molded article for a photographic light-sensitive material collected after use.

[0002]

2. Description of the Related Art A lens-fitted film unit is well known as a unit containing a photographic light-sensitive material. The film unit with a lens is a unit in which a simple shooting mechanism is incorporated with an unexposed photo film cartridge built in, and the surface is covered with an exterior body so that you can take a picture immediately on the spot you purchased it. It is widely used because it is easy to send it to a store that handles development even after shooting.

Since the components constituting this unit body must contain the photographic light-sensitive material in a light-tight manner, a thermoplastic resin composition having a light-shielding property has hitherto been used as the main constituent material. And is formed by injection molding. The unit main body is basically composed of a main body base for accommodating a photographic film and a front cover and a rear cover for covering the main body base from the front and the rear, respectively. The main body base, the front cover, and the rear cover are made of resin molded products, and polystyrene (PS) resin is generally used as a molding material for these.

As the exterior body, a band-shaped label or the like is used in addition to a paper box whose surface is printed for makeup.
This film unit with lens has a band-shaped outer label coated with an adhesive, wrapped around the outer peripheral surface of the unit body,
The left and right sides of the unit body are left exposed, which has the advantage that the image of the outer shape can be improved and the assembly is simplified compared to the case where the entire surface of the unit body is covered with a paper box. . Further, by winding the outer label around the unit body, the engagement strength between the front cover and the rear cover becomes strong. A plastic synthetic paper called "YUPO" (registered trademark), which uses polypropylene (PP) resin as a base material, is often used for such exterior labels.

On the other hand, in order to conserve resources and reduce industrial waste, the lens-fitted film unit is being actively recycled. When a user takes a photo film unit with a lens containing a photo film taken to a photofinishing shop, the photo film unit with a lens is further collected at a photo lab, where the photo film is taken out to perform the film development and print processing. Is done. After the photo film is taken out, the lens-fitted film unit is collected by the manufacturer, and the unit body is disassembled into parts. The parts that can be reused are supplied to the manufacturing process as they are, and the parts that cannot be used are used as raw materials. In particular,
Although the front cover and the rear cover are partially covered with the outer label, there are many parts exposed on the surface. Therefore, it is easy to get scratches and stains during use and it is difficult to reuse it as a part as it is, so that it is recycled as a raw material.

[0006]

However, since the PS resin, which is the base material of the front cover and the rear cover, and the PP resin, which is the base material of the exterior label, do not necessarily have good compatibility, the front cover and the rear cover are not compatible with each other. When recycled as a raw material, the outer label must be peeled off before crushing, melting, and pelletizing, which tends to complicate the process.

Further, as known from Japanese Patent Laid-Open No. 11-143025, there is also known a method of devising the composition of the outer label and crushing and recycling the front cover and the rear cover together with the outer label without removing the outer label. However, when the regenerated resin thus obtained is melted, a gas is generated, and when the resin is cured, it is left in a fine space in the resin material in a state where it is easily separated. It is known that, for example, when exposed to a relatively high temperature environment, the gas is separated from the resin and adversely affects the photographic properties, causing a chemical change in the photographic emulsion and causing a slight chemical fog. ing. There is a method of mixing special carbon to reduce this, but it is inevitable that the cost of raw materials and the number of recycling steps increase.

The present invention has been made in consideration of the above circumstances, so that the photographic light-sensitive material is not adversely affected and the recycling process can be simplified so that the resin material can be efficiently reused. It is an object of the present invention to provide an outer casing of an injection-molded article for a photographic light-sensitive material and a method for recycling a resin.

[0009]

In order to achieve the above object, the exterior body of the injection-molded article for photographic light-sensitive material of the present invention is made of a plastic material containing a porous resin material,
The injection-molded article of the photographic light-sensitive material is crushed and melted together with this exterior body so that it can be resold. The porous resin material contained in the outer package absorbs the gas generated when the photographic photosensitive material injection-molded product is melted and does not diffuse it outside, so the photosensitive emulsion is fogged by the gas. Will disappear.

Further, an injection-molded article for a photographic light-sensitive material, a main body base into which an unexposed photographic light-sensitive material can be photographed,
When the lens-fitted film unit including the cover member that covers the base of the main body is used, the weight of the outer label serving as the outer body is 0.5% to the weight of the cover member.
It is effective to set it within the range of 10%. Further, in the resin recycling method of the present invention, by utilizing the exterior body having the above-mentioned configuration, the injection molded article for a photographic photosensitive material can be crushed and melted together with the exterior body attached to the exterior. In addition, it is possible to prevent the generation of harmful gas that adversely affects the photographic properties and to improve the efficiency of the recycling process.

[0011]

1 is an external perspective view showing a lens-fitted photo film unit (hereinafter referred to as a photo film unit) 2 embodying the present invention. As shown in FIG. 1, the film unit 2 is composed of a unit body 3 and an exterior label 4. The unit main body 3 is mainly composed of a plurality of plastic-molded parts, and has a main body base (not shown) in which a simple photographing mechanism and an unexposed photographic film are incorporated,
It is composed of a front cover 6 and a rear cover 7 that cover the front and back. The unit body 3 has a photographing lens 1 on its front surface.
1, a viewfinder objective window 12, a strobe light emitting section 13, a strobe operation knob 14, a release button 15, a film counter window 16 on the upper surface, and a winding knob 17 on the rear surface.
But they are arranged respectively.

The exterior label 4 is used as an exterior body that covers the surface of the unit body 3, and straddles a front cover 6 and a rear cover 7 that form a cover member of the unit body 3.
The central part of these is covered in a strip shape. An adhesive is applied to the back surface of the outer label 4, and a front cover 6 and a rear cover 7 are provided.
Pasted on. Further, the exterior label 4 has openings 1 at positions corresponding to the taking lens 11, the viewfinder objective window 12, the film counter window 16 and the like of the unit body 3.
8 are provided to expose each part to the outside.

The exterior label 4 is made of synthetic paper made of plastic, PP resin is used as a base material, and a small amount of inorganic material such as titanium oxide or calcium carbonate is added for whitening. As an example, PP resin is 97 by weight.
%, And the inorganic material is about 3%, but these ratios can be appropriately changed. As the PP resin, a porous one having a high gas adsorbing ability is used, and for the same reason, it is preferable to use a porous one as the inorganic material.

The used lens-fitted film unit is disassembled after the collection, and the front cover 6 and the outer cover 7 are crushed with the outer label 4 attached. The weight of the outer label 4 is about 2.4% of the total weight of the cover member including the front cover 6 and the rear cover 7 and the outer label 4, and the weight percentage is preferably 0.5%. ~ 1
It is preferable to set it in the range of 0%, more preferably 2% to 5%.

The operation of this embodiment will be described. After the photographic film and the cartridge are housed and the unit main body 3 is manufactured, the exterior label 4 is attached to the surface thereof. Since the outer label 4 is mixed with titanium oxide, calcium carbonate and the like for whitening, bright color can be obtained even when color printing for makeup is performed. After attaching the outer label 4, the lens-fitted film unit is enclosed in a gusset bag having a light-shielding property and a moisture-proof property, and shipped as a product.

The film unit with lens 2 for which photographing has been completed is sent to a developing and handling shop for development and printing. At a developing shop, the cartridge containing the exposed photographic film is taken out from the bottom surface, and the film is developed and printed. The unit main body 3 after the photographic film and the cartridge are taken out in this way is sent to the factory for reuse and recycling.

At the factory, the unit body 3 is sorted by model and sent to the recycling process for each model. In the recycling process, first, the exterior label 4 is cut along the boundary line between the front cover 6 and the rear cover 7. Then, the front cover 6 and the rear cover 7 are removed from the film unit 2. The base of the main body is disassembled into functional units, and the functional inspection is performed on a unit-by-unit basis, and is divided into those that can be reused and those that cannot.

The front cover 6 and the rear cover 7 are crushed with the outer label 4 still attached. The crushed resin material is melted and then pelletized to be used as a raw material for a newly manufactured product. When pelletizing, new resin pellets may be mixed to maintain the quality of the resin.

When the crushed resin material is melted, gas is generated from the PS resin which is the resin base material of the front cover 6 and the rear cover 7. However, since the crushed material of the outer label 4 is also mixed in the crushed resin material, when these are melted at the same time, the PS resin and the porous PP resin are mixed. Therefore, the gas generated from the PS resin is adsorbed by these porous PP resin materials and becomes difficult to diffuse to the outside. Of course, it is more effective to use a porous inorganic material for the outer label 4. The recycled resin material pelletized in this way is put into an injection molding machine as a raw material for the next product and re-melted. Even if gas is generated at this time, the porous resin material captures this as well. .

The lens-fitted film unit manufactured using recycled resin is often displayed in a store for sale or under high temperature conditions while being used by a user. In such a case, particularly a product manufactured using a recycled resin tends to generate a gas, but since the porous resin material contained in the outer label 4 adsorbs the gas as described above. No gas is re-emitted and no chemical fog occurs on the photographic film.

Further, since the outer label 4 is about 2.4% of the total weight of the front cover 6 and the rear cover 7 which are simultaneously crushed and melted, the PP resin of the outer label 4 contains the front cover 6 and the rear cover 7. Even if it mixes with the PS resin of the rear cover 7, the performance of the PS resin is hardly deteriorated. While the resin is repeatedly reused in this manner, the amount of PS resin may decrease relatively, and the performance of PS resin may deteriorate. By replenishing the PS resin, it is possible to reduce such an adverse effect.

In the above embodiment, the cover member of the lens-fitted film unit is an injection-molded article for a photographic light-sensitive material,
Although the outer label attached to the cover member as the outer body has been described as an example, the present invention is also applicable to the case where a label printed with a product name and the number of films is attached to a plastic cartridge body known as APS film, for example. Are equally applicable. Further, the present invention can be effectively used when the exterior body is used for a film pack of instant film, a magazine accommodating photographic paper rolls, or the like.

[0023]

As described above, according to the present invention, a plastic material containing a porous resin material is used as an exterior body for covering a part of an injection-molded article for a photographic photosensitive material made of polystyrene resin. Therefore, when reusing the resin material that constitutes the injection-molded article for the photographic light-sensitive material, the outer body is crushed,
When melted, the porous resin material can adsorb harmful gas, so that no gas is released from the injection molded product for photographic light-sensitive material produced by this recycled resin, and the photographic property is improved. Can be prevented from being adversely affected. The present invention is also effectively applied to the cover member of the lens-fitted film unit manufactured on the premise of recycling and the outer label attached to the surface thereof, and in this case, the total weight of the outer label and the cover member. On the other hand, setting the weight of the outer label within the range of 0.5% to 10% is effective in maintaining the performance of the polystyrene resin which is the resin material of the cover member.

Further, since a plastic material containing a porous resin material having a high ability to adsorb harmful gases is used as an exterior body for covering a part of the injection molded product for a photographic photosensitive material made of polystyrene resin, the exterior body It becomes possible to crush and melt injection-molded articles for photographic light-sensitive materials, including the body, to regenerate the resin, enabling efficient recycling.

[Brief description of drawings]

FIG. 1 is an external perspective view of a lens-fitted film unit embodying the present invention.

[Explanation of symbols]

2 Film unit with lens 3 unit body 4 exterior label 6 front cover 7 Rear cover

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03C 3/00 575 G03C 3/00 575H 590 590E B29B 17/00 ZAB B29B 17/00 ZAB (72) Inventor Hideo Tomizawa 210 Nakanuma, Minamiashigara City, Kanagawa Prefecture Fuji Photo Film Co., Ltd. F-term (reference) 4F301 AA14 AA15 BD06 BF12 BF15 BF32

Claims (4)

[Claims] 1. An exterior body which covers at least a part of an injection-molded article for a photographic light-sensitive material, which is made of a polystyrene resin molding containing a photographic light-sensitive material, is made of a plastic material containing a porous resin material. The outer casing of the injection-molded product for photographic light-sensitive material. 2. The injection molded product for photographic light-sensitive material is a cover member for a lens-fitted film unit that covers a base of a main body accommodating a photographic film.
An outer casing of an injection-molded article for a photographic light-sensitive material as described above. 3. The injection for photographic light-sensitive material according to claim 1, wherein the weight is 0.5% to 10% with respect to the total weight of the cover member attached to the cover member. Exterior body of molded products. 4. An injection-molded article for a photographic light-sensitive material produced by injection-molding a thermoplastic resin is recovered and crushed after use,
In the resin recycling method in which the crushed material is melted again and used for injection molding, the exterior body covering at least a part of the surface of the injection-molded article for photographic light-sensitive material is made of a plastic material containing a porous resin material. At the same time, at the time of crushing a used injection-molded article for photographic light-sensitive material, the resin is crushed at the same time without peeling off the outer casing.