| 摘要 |
PURPOSE:To obtain a multi-layered container high in interlaminar bonding strength, by a method wherein a saponified ethylene-vinyl acetate copolymer is supplied from a position shifted to the circumferential direction of a mandrel as an intermediate layer to be made confluent with other layers and the obtained laminate is made thin in a co-extrusion die. CONSTITUTION:Intermediate layers 3, 4 each comprising a saponified ethylene- vinyl acetate copolymer are supplied so as to be independently spaced apart to each other in each thickness direction thereof and made coffluent with synthetic resin (polyethylene) 2 low in moisture permeability in a multi-layered state while interposing the same therebetween so as to be interposed over the whole of a surrounding wall. In confluence, the resin of each intermediate layers is supplied from a position shifted to the circumferential direction of a mandrel 8. Even if a pinhole is generated in the welded part of the intermediate layers, the positions of sand layers are mutually shifted to the circumferential direction and the lowering in gas barrier property is not generated. |
