| 摘要 |
This invention is used to manufacture the various kinds of tubes made from thermoplastic, synthetic resins. The process comprises I) melting the thermoplastic, synthetic resin and extruding it: II) pre-cooling it down until it can form its shape: III) reforming its shape in a vacuum induction plastic room: IV) passing it into the direct contact type cooling rooms (A,B,C) that have the materials which regulate the physical properties step by step.
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