| 摘要 |
PURPOSE:To raise the accuracy of multilayers in thickness as well as facilitate the regulation of the constitutional ratio of the multilayers by providing a structure by which molten resin is mixed in a mechanism without driving force substantially for the screw after a supply port through which the second molten resin is forcibly supplied. CONSTITUTION:The first molten resin A supplied from the supply port 2 of a cylinder 1 into which a screw 4 is inserted is sent through the inlet 5 of a tubular hole, the tubular hole 6, and a braker plate 91 to a pipe die 12, while the second molten resin B supplied from a supply port 3 by an extruder 13 for forced pushing is sent to the die 12 (where 82 is a pathway through which part of the resin A is mixed with the resin B), and then the resin mixture is molded into a pipe. In such an extruder, a structure having a mixing action but a smaller driving action than that of the extruder 13 is provided for the screw 4 after (the mixing section of the second molten resin) the supply port 3.
|
