JPH0555019B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a photographic film magazine, and more particularly, a light shielding member having pulses attached to the film entrance/exit portion of a photographic film magazine is improved. This invention relates to a photographic film magazine with improved smoothness of return operation. [Background of the Invention] In a photographic film magazine, a light shielding member is usually attached to the film entrance/exit portion to prevent light from entering the magazine body from the film entrance/exit portion. This light-shielding member must not only prevent the film from being exposed to light as a light-shielding member, but also prevent damage to the film when pulling out and rewinding the film, as well as smoothing out and rewinding the film. , a flexible material such as pile fabric is used. On the other hand, recent photographic films are becoming more highly sensitive and high-quality, and as a result, there is a demand for light-shielding materials that have improved light-shielding performance, which is the basic performance of the light-shielding materials used. . On the other hand, conventional methods for improving the light-shielding performance of light-shielding members include increasing the pile density of the pile fabric used in the light-shielding member and reducing the gap between the film entrance and exit portion of the photographic film magazine. I was trying to find a solution. However, if the elastic strength of the yarn used to increase the pile density is low, the pile will easily collapse during the film magazine manufacturing process, etc.
This reduces the light shielding effect. Further, when the elasticity is high and the pile density is high, there is a problem that the film surface is easily scratched when the film is pulled out and rewinded. Generally, in methods of increasing the pile density of pile fabrics, increasing the number of piles uses more pile fibers than conventional methods, which inevitably increases costs such as raw material costs and processing costs, and also causes piles to fall off. I couldn't control it. This pile fall occurs during the photographic film magazine manufacturing process when the pile falls off and adheres to the inside of the magazine, and if it re-adheres to the film at the time of shooting, it can cause a film accident (the adhered area becomes white and falls off). Furthermore, even after the film magazine has been commercialized, a similar accident will occur if the pile falls off and adheres to the film surface when the film is pulled out or rewound. Furthermore, increasing the pile density increases the number of piles in contact with the film, which has the disadvantage of increasing the load when pulling out and rewinding the film, and making it easier to generate static electricity. In the method of reducing the gap between the entrance and exit portion of the film, the load when pulling out and rewinding the film becomes large, and accidents such as damage to the surface of the film tend to occur. As a result of intensive studies on light-shielding members, the present inventors have found that the Young's modulus of the pile fabric of the pile fabric used for the light-shielding member is effective in preventing damage to the film during film withdrawal and rewinding and facilitating film withdrawal and rewinding operations. It was discovered that there is a relationship between the two, and this led to the present invention. [Object of the Invention] An object of the present invention is to provide a photographic film magazine having a light shielding member that prevents film damage without impairing light shielding performance and improves the smoothness of film drawer and rewind operations. [Structure of the Invention] The above object of the present invention is to provide a photographic film magazine in which a light shielding member having a pile is attached to a photographic film entrance/exit portion, the pile of the light shielding member having a Young's modulus of 100 to 1800 (Kg/mm ² ). This is accomplished with a photographic film magazine formed from thread. [Specific Structure of the Invention] In the present invention, the Young's modulus of the pile yarn, which represents the bending flexibility of the yarn, is a constant measured by the method described on page 520 of Synthetic Fiber Handbook (Asakura Shoten Co., Ltd.). That is, a strength and elongation curve is drawn using a strength and elongation tester, and Young's modulus is calculated using the following formula. The number of tests is 10, and the average value is expressed. Young's modulus (Kg/mm ² ) = elastic strength x 100/elastic elongation x cross-sectional area. However, elastic strength and elastic elongation are calculated by △w/△l (w is load, l is elongation) Take the maximum value. Further, the cross-sectional area is calculated from the denier and specific gravity and is expressed in mm ² . In the present invention, it is necessary that the Young's modulus of the pile yarn defined by the above formula is 100 to 1800 (Kg/mm ² ), preferably 200 to 1500 (Kg/mm ² ), and Preferably it is 300 to 1100 (Kg/mm ² ). A pile yarn having the Young's modulus described above (hereinafter referred to as the pile yarn of the present invention) can exhibit the effects of the present invention, but one pile yarn of the present invention has a density of 50 denier to
The yarn thickness is preferably 150 denier and is preferably formed from 25 to 100 filaments, more preferably the yarn thickness is 70 denier to 120 denier.
It is formed from 45 to 60 filaments. In the pile yarn of the present invention, if the Young's modulus is within the range of the present invention, the effects of the present invention can be achieved, but physical properties of the pile yarn other than Young's modulus include compression elasticity, elongation elasticity, and coefficient of friction. Among these substances, compression elasticity and extensional elasticity are important as characteristic values that control the collapse of piles, but when using pile fabrics with these characteristic values within a certain range, it is difficult to prevent scratches. There is little prevention effect against. In addition, the coefficient of friction affects the film draw-out and rewind operations, but this physical property value is affected by the pile density and the height of the film draw-out opening, so it can be adjusted even if the friction coefficient of the pile fabric is unfavorable. It is a physical property. The fiber material for the pile yarn of the present invention used in the photographic film magazine of the present invention is not limited to the material and can be any material that satisfies the Young's modulus specifications of the present invention, such as nylon 6,
6 and other polyamides, polyesters such as polyethylene terephthalate, polyolefins such as polyethylene, polyvinyl alcohols, polyvinylidene chloride, polyvinyl chloride, polyacrylonitrile, polycyanide vinylidene, polyfluoroethylene, polyurethane, etc. Examples include one or a combination of two or more fibers selected from synthetic fibers, silk, cotton, wool, cellulose-based, cellulose ester-based natural fibers, and regenerated fibers (rayon, acetate, etc.). Preferred among these fiber materials are polyamides such as nylon 6 and nylon 6,6, polyesters such as polyacrylonitrile and polyethylene terephthalate, cellulose as regenerated fibers, and cellulose esters such as rayon and acetate. The light shielding member having a pile system of the present invention (hereinafter referred to as the light shielding member of the present invention) is basically composed of pile and base fabric, and is manufactured by a method generally used for manufacturing light shielding members having piles. For example, plain weave with common fibers,
It can be obtained by twill weaving, and it was also made in 1988.
The knitting structure described in No. 104143 can be obtained using a knitting machine. When a light-shielding member having the pile yarn of the present invention is manufactured using plain weave, twill weave, etc. obtained from the above-mentioned general fibers, the pile yarn of the present invention is used as the warp, and the weft is V-crossed and W-shaped.
It can be used either way. The fiber material for the base fabric of the light shielding member of the present invention includes:
The same fiber material as used for the pile yarn of the present invention can be used, and in the light shielding member of the present invention, the fiber material for the pile yarn and the fiber material for the base fabric may be the same or different. In the light shielding member of the present invention, the height of the pile yarn of the present invention including the base fabric is preferably 1 mm to 2 mm, and the filament density of the pile is:
20000 to 50000 pieces/ ^cm2 is preferable, more preferably
The number is 25,000 to 40,000 pieces/ ^cm2 . In the light-shielding member of the present invention, if the pile is formed using the pile yarn of the present invention, the black dyeing process for the light-shielding member can be carried out after forming the light-shielding member even if it is dyed at the pile yarn stage. You may also stain with. Furthermore, for the purpose of preventing static electricity, a pile yarn that has been subjected to antistatic processing such as by incorporating carbon into the yarn may be used, or it is also possible to perform charging processing after forming it as a light-shielding cloth. In addition, when manufacturing light shielding members, wide width (approximately 30 cm ~
100 cm) and then cut to a width used as a light-shielding member, or it can be manufactured from the beginning with a width for a light-shielding member. In this wide cutting method, the cutting means may be the means described in Japanese Utility Model Publication No. 48-35790, or any means such as an ultrasonic cutter, a laser cutter, a heat cutter, etc. can be used. The photographic film magazine of the present invention can be obtained by the same manufacturing process as a conventional film magazine, except that the pile yarn of the present invention is used as the pile yarn of the light-shielding member having piles. In the manufacturing process, for example, a rectangular metal plate that becomes the magazine body is heated, and a light shielding member coated with an adhesive is bonded to both ends thereof by thermocompression. Next, the magazine body is rolled up, film is loaded, and capping is applied to obtain a photographic film magazine. Further, in the photographic film magazine of the present invention, the height of the inside of the film entrance/exit portion of the film magazine main body to which the light shielding member of the present invention is adhered to both inner surfaces of the film magazine body before the light shielding member is attached to the film entrance/exit portion of the film magazine body. (hereinafter referred to as film entrance/exit height) is preferably approximately 1.50 to 2.60 mm, more preferably 1.80 to 2.40 mm, although it depends on the pile height including the base fabric of the light shielding member used in the present invention. is within the range of A method for attaching the light shielding member of the present invention to a magazine body is disclosed in Japanese Patent Application Laid-open Nos. 49-96049 and 53-105219.
No. 53-105220, No. 53-105221, No. 54-
The methods described in Japanese Patent Application No. 4932, Japanese Patent Application No. 60-75207, etc. can be applied. In the photographic film magazine of the present invention, metals forming the magazine body include, for example, iron and steel, zinc, aluminum, steel, and alloys thereof. In addition, the surfaces of these metals can be coated with phosphate coating, iron oxide coating,
Metal surface treatment may be performed by a chromate film formation method, a chromic acid-based oxide film formation method, a chromate diphosphate film formation method, or the like. Furthermore, the metal surface is
It may be coated with the paint, ink, etc. described in Japanese Patent Application No. 60-26063, Japanese Patent Application No. 60-75207, etc. Specific paints and inks include alkyd resins, amino-alkyd resins, vinyl resins, acrylic resins, epoxy resins, polyurethane resins, polyester resins, various anti-rust paints, water-based paints, and cellulose derivatives. Examples include paints, inks, etc. In the light-shielding member of the present invention, a filler can be used to prevent the pile made of the pile yarn of the present invention from falling off the base fabric and to prevent the adhesive from penetrating into the pile portion. The sealants used in the present invention include synthetic resin emulsions such as polyvinyl, polyolefin, polyurethane, polyamide, polyester, synthetic rubber, epoxy, phenol, and acrylic not included in these. Examples include a copolymer emulsion of one or more selected blends or a combination thereof. In the present invention, the adhesive used to attach the light-shielding member having the pile to the magazine main body may be a polyolefin adhesive such as polyethylene, a vinyl acetate copolymer adhesive such as ethylene-vinyl acetate copolymer, or an ethylene-vinyl acetate copolymer adhesive. ethyl acrylate,
Acrylic acid ester copolymer systems such as ethylene-isobutyl acrylate, polyamide systems such as nylon 6, nylon 6,6, nylon 10, nylon 12, N-methoxymethylated nylon, polyester systems such as terphthalic acid systems, polyvinyl butyral systems, Cellulose derivatives such as polyvinyl acetate, acetate, methyl cellulose, and acetate butyrate, polymethacrylate esters such as polymethyl methacrylate, polyvinyl ethers such as polyvinyl methyl ether, polyurethane,
Polycarbonates, styrene block copolymers such as styrene-ethylene-butylene-styrene, synthetic rubbers such as styrene-butadiene, isoprene, and butyl rubber, or special rubbers not included in these, and acrylic copolymers not included in the above. Examples include one type or a mixture of two or more types selected from combinations and the like. [Specific Effects of the Invention] As explained above, the photographic film magazine of the present invention has a light shielding member made of pile yarn having a Young's modulus in a specific range, so that it is possible to protect the film without impairing the light shielding performance. It has been possible to provide a photographic film magazine that prevents damage and improves the smoothness of film drawer and rewind operations. [Specific Examples of the Invention] Hereinafter, the present invention will be specifically explained using Examples, but the embodiments of the present invention are not limited thereto. Example 1 Young's modulus, pile yarn thickness, pile filament density shown in Table 1 below, using pile yarn made of fiber material and using rayon as the base fabric, pile filament density and pile shown in Table 1 A light shielding member having a height was prepared, and film magazine samples 1 to 19 were prepared in which a film having a light blocking member was loaded according to the method described in the text. The width of the slit at the film entrance/exit is 2.3 mm.
It was fixed at mm.

【table】

【table】

[Table] For the film magazine samples loaded with 19 kinds of film obtained above, after storing them at 60℃ for 3 hours, irradiating them at 900 lux for 10 minutes with the film outlet facing up, and then performing normal development processing to eliminate light leakage. When the degree was visually judged, it was found that all the samples were in good condition with no light leakage. Next, the same 19 types of samples were placed on the Konica Recorder DD.
(manufactured by Konishiroku Photo Industry Co., Ltd.), the film was subjected to normal processing, and the degree of scratches that had occurred on the film was visually judged. Scratches were observed. Sample 17 was also examined regarding the operability during the above-mentioned shooting and when pulling out and rewinding the film after shooting.
Samples ~19 were heavier and difficult to handle than other samples, and had problems in practicality. From the above results, it has been found that in a photographic film magazine having a light shielding member using pile yarn having a Young's modulus within the range of the present invention, damage to the film can be prevented without impairing the light shielding performance, and film unwinding and rewinding operations can be smoothly performed. It can be seen that this is a photographic film magazine with improved characteristics.

Claims (1)

[Claims] 1. In a photographic film magazine in which a light shielding member having a pile is attached to the photographic film entrance/exit portion, the pile of the light shielding member has a Young's modulus of 100 to 1800.
(Kg/mm ² ) thread.