To improve operation efficiency by feeding continuously a film while thermal shrinkage of the film is prevented by a method wherein an edge part of the film is supported and continuously sent into liquid with an endless belt or the like in which many engaging means which are arranged on both sides of the film to fix stationarily the edge part of the film, are provided.
An endless belt arranged on both sides of a film is composed of an endless belt 13 equipped with a pin 12 as an engaging means, and after drawing the film 11 extruded from a die, stationarily fixing both edge parts of the film 11 with the pins 12 to carry out continuous feed. Then, for example, pulleys 16 are arranged zigzag in a container 15, and the film 11 is passed in liquid by being zigzag flexed with the endless belt 13 with the pins 12. Thereby, thermal shrinkage of the film 11 is prevented, and the film 11 can be continuously sent with the endless belt 13.
KOIZUMI HIROSHI
KATO EIJI
OHASHI MASAAKI
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