| 摘要 |
PURPOSE:To provide easily the thin covering layer to the multilayer film containing a thin and flexible metal layer, by covering the molten parison for covering the inner layer on the inner face of the cylindrical film composed of multilayer film in the specified condition. CONSTITUTION:The multilayer film 1 laminated in order of the adhesive resin layer, the metal layer, the adhesive layer is rounded, fusion bonded at the ends to each other by seal resin and made into a cylindrical film 3. The inner face of the cylindrical film 3 is covered by the molten parison 7 extruded from the tip of a die head 4 for an inner face covering. The pressure of the first sucking space 17 and the second sucking space 19, and of the space between the molten parison 7 and the cylindrical film 3 is kept by 0.1-30cmHg lower then the inside and the inside pressure of the parisn 7 and of the cylindrical film 8 with which the inner layer is already covered is maintained nearly at the atmospheric pressure. |
