| 摘要 |
PROBLEM TO BE SOLVED: To obtain a film which is uniform in thickness and properties by controlling vibration at both side edge parts of the film by a method wherein air is drawn by a main suction means from between a thermoplastic resin film and a cooling roll removing by suction, and an auxiliary suction means is provided on both end sides of a contact line wherein the film starts coming in contact with the cooling roll. SOLUTION: Thermoplastic resin is extruded in a film shape, and solidified by cooling by being brought in contact with a rotating cooling roll 1. In this case a contact line wherein thermoplastic resin extruded by melting starts to come in contact with the cooling roll 1 is made an adhesion point M, and air which has intruded between the thermoplastic resin and the cooling roll 1 at the adhesion point M is discharged by being sucked by a suction means 3 provided on a rear part side in a rotary direction of the cooling roll 1 to stick the thermoplastic resin close onto a surface of the cooling roll 1. Further, separately from the main suction means 3, an auxialiary suction means 4 is provided onto both end sides of the adhesion point M, and vibration of both end parts of a neckin part is controlled by execution of sucking with suction force preferably not exceeding suction force of the main suction means 3 in a direction almost parallel to the contact line. |
