| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a thermoplastic resin film with high reflectivity using a twin screw extruder. <P>SOLUTION: There is provided an extrusion method using the twin screw extruder so that the length of a part using a kneading disk in a material conveyance direction is 2.5D-15.0D when D is defined as the outermost diameter of a screw. The extrusion method is characterized by supplying a resin composition including a thermoplastic resin having a surface tension of 30 mN/m or lower from one material supply port to the twin-screw extruder, and extruding it. <P>COPYRIGHT: (C)2013,JPO&INPIT |
