| 摘要 |
<p>An extrusion molding apparatus (1) for a resin multi-layer tube capable of increasing the accuracy of the wall thicknesses of the inner and outer layers of the multi-layer tube molded thereby, comprising a plurality of extruders (6, 7) and a die (11) in which an inner layer tube molding passage (9) allowing the molding of an inner layer tube (2a) by allowing a resin (3) extruded from one extruder (6) of these extruders (6, 7) to be passed therethrough and an outer layer tube molding passage (10) allowing the molding of an outer layer tube (2b) integrally fitted onto the inner layer tube (2a) by allowing a resin (4) extruded from the other extruder (7) to be passed therethrough are formed and which allows the molding of the multi-layer tube (2) by the inner and outer layer tubes (2a, 2b). Inner and outer extruding ports (17, 18) forming the front ends of the inner and outer layer tube molding passages (9, 10) are disposed in proximity to each other in the radial direction, and individually opened forward from the front end face (19) of the die (11).</p> |
