| 摘要 |
PURPOSE:To obtain a uniform thickness laminate with no pinhole by a method wherein barrier thermoplastic resins are extruded from a die, which has at least two die lips, so as to be melt-adhered to each other before the resins are cooled and set. CONSTITUTION:Barriers 1 such as of saponified ethylene-vinyl acetate copolymer or the like are extruded from at least two die lips 6a and 6b so as to be divided into two layers and melt-adhered after being extruded from a T-die 6 and cooled by cooling rolls 7 and 8 in order to be taken up with a winder (not shown in the figure) in the form of a laminate (laminated film). When the temperature of the barriers is low and the adhering pressure is small, the inter-layer adhesion lowers and consequently the contrivance for improving the adhesion is recommended by adding heat and pressure at the following process. A material having the degree of oxygen transmission of 50 cc/m<2>-24 hr-atm or less is preferable as the barrier thermoplastic resin used for the barrier 1. Favaorably, saponified ethylene-vinyl acetate copolymer is concretely exampled as the barrier thermoplastic resin used for the barrier 1. |
