Light-shielding cloth and light-shielding container for photosensitive material using same

Abstract

A light-shielding cloth that is to be bonded to a slit-form opening of a container for a photosensitive material is formed from a base fabric and a crimped pile thread incorporated into the base fabric so that the pile density is in the range from 45,000 threads/cm 2 to 85,000 threads/cm 2 , a hot-melt adhesive region being provided on the reverse side of the base fabric without a filling agent being applied thereto for the purpose of preventing the hot-melt adhesive from penetrating the base fabric. A container for a photosensitive material is formed by bonding the light-shielding cloth to a slit-form opening using a 100% solids adhesive, preferably an ethylene-vinyl acetate copolymer resin based adhesive, without a treatment with a filling agent. A narrow-width light-shielding ribbon is formed by slitting the light-shielding cloth by means of an ultrasonic slitter.

What is claimed is:  
     
         1 . A light-shielding cloth comprising: 
 a base fabric having first and second opposing surfaces;    crimped pile threads incorporated into the base fabric and protruding from said first surface of the base fabric, said threads having a pile density in the range of 45,000 threads/cm 2  to 85,000 threads/cm 2 ; and    a hot-melt adhesive provided on said second surface of the base fabric, without a filling agent between the base fabric and the adhesive.    
     
     
         2 . A light-shielding container for a photosensitive material formed by providing a light-shielding member on a slit-form opening through which the photosensitive material passes, the two sides of the slit-form opening comprising in cross section: 
 a light-shielding container main body;    a hot-melt adhesive region; and    a light-shielding cloth comprising a base fabric having first and second opposing surfaces, crimped pile threads incorporated into the base fabric and protruding from said first surface of the base fabric, said threads having a pile density in the range of 45,000 threads/cm 2  to 85,000 threads/cm 2 , without a filling agent being applied to the second surface of the base fabric.    
     
     
         3 . A narrow-width light-shielding cloth obtained by cutting the wide-width light-shielding cloth according to  claim 1  by means of an ultrasonic slitter.  
     
     
         4 . The light-shielding cloth according to  claim 1  wherein the composition of the hot-melt adhesive is 40 to 50 parts by weight of an ethylene-vinyl acetate copolymer resin, 25 to 35 parts by weight of a tackifier, 5 to 15 parts by weight of inorganic fine particles and 10 to 20 parts by weight of a wax.  
     
     
         5 . The light-shielding container for a photosensitive material according to  claim 2  wherein the composition of the hot-melt adhesive is 40 to 50 parts by weight of an ethylene-vinyl acetate copolymer resin, 25 to 35 parts by weight of a tackifier, 5 to 15 parts by weight of inorganic fine particles and 10 to 20 parts by weight of a wax.  
     
     
         6 . The light-shielding cloth according to  claim 3  wherein the composition of the hot-melt adhesive is 40 to 50 parts by weight of an ethylene-vinyl acetate copolymer resin, 25 to 35 parts by weight of a tackifier, 5 to 15 parts by weight of inorganic fine particles and 10 to 20 parts by weight of a wax.  
     
     
         7 . The light-shielding cloth according to  claim 3  wherein the width is 2 to 30 mm.  
     
     
         8 . The light-shielding cloth according to  claim 1  wherein the pile thread has a thickness of 56 to 110 decitex and is formed from 25 to 100 filaments.  
     
     
         9 . The light-shielding container for a photosensitive material according to  claim 2  wherein the pile thread has a thickness of 56 to 110 decitex and is formed from 25 to 100 filaments.  
     
     
         10 . The light-shielding cloth according to  claim 1  wherein the pile density is 50,000 to 75,000 threads/cm 2 .  
     
     
         11 . The light-shielding container for a photosensitive material according to  claim 2  wherein the pile density is 50,000 to 75,000 threads/cm 2 .