| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method using no ink in the formation of a film comprising a thermoplastic resin on which a marking such as a symbol, a graphic, a character and a number is applied. <P>SOLUTION: When the thermoplastic resin is melted in an extruder 1 and discharged from an extrusion nozzle 10 as a molten flow 30, guided on the surface of at least one of cooling rollers 20, 21, 22 and cooled to form a film 31, the molten flow 30 and/or the film 31 formed by the molten flow is treated in a partial region corresponding to the markings 40, 41 on surfaces of at least one of the cooling rollers 20, 21, 22 so that a cooling force different from that in the remaining surface can be imparted. <P>COPYRIGHT: (C)2013,JPO&INPIT |
