MANUFACTURE OF CYLINDRICAL LAMINATED FILM

• Main Authors: TAKE KAZUO, KIDO YOSHIYUKI
• Format: Patent
• Language: English
• Published: 19.05.1998
• Edition: 6
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PERFORMING OPERATIONS; 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

PROBLEM TO BE SOLVED: To provide a method for manufacture of a cylindrical laminated film which is easily molded and excellent in transparency without any crease in the case where aromatic crystalline thermoplastic resin is used as one of a cylindrical laminated film in a downward water cooling system inflation molding method. SOLUTION: A plurality of laminated bubbles 3 molded by extruding molten resin downward from a laminate die 1 are air cooled, successively water cooled with a sizing ring part 5, further made flat with a stabilizer 6, and taken back with a pinch roll 7. In a downward water cooling inflation molding method for cylindrical laminated film, at least olefin thermoplastic resin and aromatic crystalline thermoplastic resin having a melt flow rate of 3-8 are used as the resin, and molding is carried out by making the most outer layer of the cylindrical laminated film with an olefin thermoplastic resin film, and setting a temperature of a die layer for aromatic crystalline thermoplastic resin at near a melting point to the melting point or lower of the aromatic crystalline thermoplastic resin.