Manufacture of thermoplastic resin sheet or film

Abstract

Abstract PURPOSE:To obtain inexpensively the titled product excellent in transparency, surface gloss and homogeneity, by introducing a thermoplastic resin that is melted and extruded from a T-die into a slit from upstream that has a specified constitution and into which water is allowed to run. CONSTITUTION:The slit 4 has such a constitution that a pair of rotating endless belts 3, 3' are opposed with a gap therebetween, water is allowed to run down in the gap, and the opposed surfaces of the endless belts 3, 3' are moved in the same direction as the running direction of the water. The thermoplastic resin 2 that is extruded from the T-die into the form of a film in the molten state is led from upstream into the slit 4 to be cooled. further, generally, the cooled resin 2 is cooled in cooling water in a water receiving tank 12 to provide the intended item. Preferably, the temperature of the cooling water is 2-30 deg.C. EFFECT:Even a high quality thick sheet or the like can be formed at high speed.

Inventors

• 👤 Junji Fujii
• 👤 淳司 藤井
• 👤 Hideyuki Takama
• 👤 秀幸 高間

Bibliographic Details