RESIN COOLING DEVICE AND METHOD FOR MANUFACTURING INFLATION FILM

摘要

PROBLEM TO BE SOLVED: To provide a resin cooling device capable of stably and rapidly manufacturing an inflation film at a low cost and a method for manufacturing the inflation film. SOLUTION: The resin cooling device 8 has an air ring 9 for blowing a cooling air from the outside to a bubble B extruded from an inflation molding die 3, and on the top of the air ring 9, cylindrical air flow regulating members 13a-13d for regulating the flow of the cooling air blown from the air ring 9 are arranged in a concentric circle fashion. The upper ends of the air flow regulating members 13a-13d become gradually higher from the inside to the outside. The height H of the upper end of the member 13d from the die 3 is larger than 2/5 of the height Hf of the frost line F of the bubble B from the die 3 and is smaller than the height Hf of the frost line F.