PRODUCTION OF POLYPROPYLENE FILM

Japanese Patent JP3940184

B2

PROBLEM TO BE SOLVED: To produce a film containing polypropylene of high quality by together extruding a plurality of kinds of melts through a flat sheet die at the same time and forming the edge portions of a film from a propylene polymer or a propylene polymer mixture during a production process.
SOLUTION: The compression, heating and melting of polymers and the supply of melt streams A, B are performed simultaneously by using a coextrusion adapter 6. However, the melt streams A, B are arranged in parallel 16. The juxtaposed melts are shaped into a film in a flat sheet die 8 and the edge parts of the film are formed from a polymer A (from the melt stream from an extruder 2). The actual film 14 includes a polymer B (from the melt stream of an extruder 1). These edge parts 12 are cut off after the longitudinal and transverse stretching of the film.

JP6571006	Multi-layer sheet, back sheet for solar cells and solar cell module
WO/2021/256006	EXTRUSION MOLDING DEVICE, SYSTEM FOR PRODUCING FILM AND METHOD FOR PRODUCING FILM
WO/1997/039890	MULTI-LAYER POLYMERIC STRUCTURE

Herbert Pfeiffer
Gunter Schleig
Karl-Heinz Cochem
Detlef Bush
Robert Schmidt

JP11161596A

July 04, 2007

May 02, 1996

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Treofan Germany GM Behr und Co Kahge

B29C48/19; B29C48/07; B29C48/08; B29C48/12; B29C48/305; B29C55/02; B29C55/12; B29C69/00; B29K23/00; B29L7/00; B29L9/00; (IPC1-7): B29C47/14; B29C47/06; B29C55/12; B29C69/00; //B29K23:00; B29L7:00; B29L9:00

JP50065572A
JP62214928A
JP2150443A
JP62265336A
JP6087191A
JP2255847A
JP6122181A
JP64064822A
JP6106598A

Kazuo Shamoto
Shosuke Imai
Tadashi Masui
Tadahiko Kurita
Yasushi Kobayashi
Shinya Hosokawa

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