JPS6141295B

• Main Author: SHIMODA MASAKAZU
• Format: Patent
• Language: English
• Published: 13.09.1986
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE:To prevent the vanish of micropores in a sheet by extrusion molding a hot kneaded mixture of olefine resin, an inorganic powder, and plasticizer to form a sheet, embossing it before cooling and hardening, and then extracting the plasticizer. CONSTITUTION:A raw material 3 comprising a mixture of low density polyethylene pellets, fine powder of silica, and petrolium oil is charged in the mixing part 5, and melted through mixing and heating with a heater 6. Then it is extruded from a die 8 with a rotor 7 to form a sheet 9, which is embossed while passing through rollers 10, 10', and the plasticizer is extracted with the aid of trichloroethylene solution 11 to obtain a sheet 12 for separators. Thus an excellent separator can be obtained without vanishing of micropores in the sheet 12 and being easily torn due to the molecular orientation.