| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a co-extruded sheet such as a multi-color single layer sheet with a color scheme of different right/left colors in the longer direction of the sheet, or a multi-color multi-layer sheet having a transparent surface layer and an intermediate layer with a color scheme of different right/left colors in the longer direction of the sheet. SOLUTION: This method is to manufacture the sheet by a co-extrusion process using a feed block-type T-die 3. That is, not less than two different kinds of thermoplastic resins 41, 42, 43, etc. of an identical type and a differing color, are made to join together through a manifold 2 for layer construction change, and each thermoplastic resin 41, 42, 43, etc. is arranged in parallel to the right/left in the extrusion direction from a resin discharge aperture 2' of the manifold 2 for layer construction change. Alternately, either one of the thermoplastic resins 41, 42, 43, etc. is made to go around to the underside of the other thermoplastic resin, or the other thermoplastic resin is arranged on the underside, or the other thermoplastic resin is arranged in parallel to the right/left, above or under a thermoplastic resin as an intermediate layer respectively. Further, passing through either of the described choice steps, the thermoplastic resins 41, 42, 43, etc. are co-extruded through the T-die 3, and thus it is possible to manufacture the multi-color multi-layer sheet S with a color scheme of different right/left colors in the longer direction of the sheet. COPYRIGHT: (C)2007,JPO&INPIT |
