| 摘要 |
PURPOSE:To contrive a reduction in molding costs by enabling formation of two kinds with an extruding machine, by a method wherein after mixing of the first and second resin, they are extruded through an opening end under a state where a viscosity difference is held between those of the both resin. CONSTITUTION:The second resin whose viscosity is high and the first resin whose viscosity is low flow respectively in the center of a resin passage 21 end on both wall sides, in auxiliary resin flowing within the resin passage 21. The auxiliary resin to be extruded through an annular nozzle 22 forms an auxiliary resin layer of two kinds in three layers where the second resin layer is pinched on both sides by the first resin layers. Main material resin passing through a main material resin passage 12 is divided into an inner and outer layers with a ring member 17 and the auxiliary material resin is extruded between the inner and outer layers through the annular nozzle 22 provided on the under surface of the ring member 17. The auxiliary resin becomes a cylindrical body, the inner and outer layers of the main material resin passed through the ring member 17 are joined to the cylindrical body on the inner and outer both surface and becomes a laminated state. Main material resin layers LM are laminated on both sides of an auxiliary material resin layer LS to give a multi-layer parison P of 3 kind resin-5 layer structure. |
