| 摘要 |
In a process for melting, extruding, and forming a thermoplastic synthetic resin, wherein a deckle mounted on a die device of an extruder is moved lengthwise of a slit in the die to thereby vary the length of the slit and to adjust the width of a flat film being extruded, the improvement comprising stopping the leaking of the molten resin around the deckle portion by forcibly cooling the deckle with a cooling medium, such as air, water or the like, so as to increase the viscosity of the molten resin around the deckle, whereby a decreased fluidity of the molten resin occurs.
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