FILM MANUFACTURING METHOD AND FILM MANUFACTURING INSTALLATION

摘要

PROBLEM TO BE SOLVED: To prevent occurrence of a draw resonance phenomenon and to improve molding speed of a film.SOLUTION: A method comprises: a first step of melting a resin material 3 forming a first layer 11 and a second layer 12 laminated on the first layer 11 and having thermoplasticity, and feeding it to a T-die 8 from first and second extruders 6 and 7 respectively; and a second step of discharging the resin material 3 from a discharging opening 8a of the T-die 8, while laminating the second layer 12 at both ends of the first layer 11 in a width direction of the discharge opening 8a. In the first step, a temperature of the resin material 3 forming the second layer 12 is higher than a temperature of the resin material 3 forming the first layer 11 by 20°C or more.SELECTED DRAWING: Figure 1