| 摘要 |
PURPOSE: To provide an extrusion head wherein the size of a tubular resin passage for at least one of resin layers is adjustable unlimitedly in that two or three or more resin layers join to form a plural-layer flow, in regard to the extrusion head for manufacturing a plural-layer tubular plastic body. CONSTITUTION: Passages which can be adjusted respectively by two spaced and inclined surfaces (the surface 74 of a sleeve 52 and the surface 76 of a tubular spacing member 54 for the resin passage 42 and the surface 60 of a ring 62 and the surface 82 of a spacing member 56 for the similar passage 50) are formed in the downstream ends of the resin passages in an extrusion head. The thickness of the passage is varied by moving axially one surface (74 and 60) relative to the other surface (76 and 82). |
