| 摘要 |
PROBLEM TO BE SOLVED: To mold a polyester film free from a die line by providing difference in level between a pair of die lips so that the leading end of the die lip on an anti-taking-over side among the die lips becomes longer than that of the die lip on a taking-over side. SOLUTION: A die and die lips are formed so as to have a structure such that difference in level is provided between a pair of the die lips of the die 30 so that the leading end of the lip 32 on an anti-taking-over side among a pair of the die lips of the die 30 becomes longer than that of the lip 31 on a taking-over side by 0.1-5.0mm, pref., 0.2-2mm. By this constitution, an extruded resin film is pulled rearwardly along the lip 32 on the anti-taking-over side to go away from the lip 31 on a taking-over side and, therefore, deteriorated matter becomes hard to adhere and the adhesion and growth of discharges are suppressed and no die line is generated. |
