发明名称 |
MANUFACTURING METHOD FOR LARGE CALIBER THICK-WALLED POLYETHYLENE PIPE |
摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a large caliber thick-walled polyethylene pipe having uniform strength without causing the resin sag from the inner surface of the pipe or the cross-sectional flattening deformation of the pipe. <P>SOLUTION: The outside surface of the formed and solidified polyethylene pipe P1 is preliminarily heated and melted, and molten polyethylene is annularly extruded from the discharge cap 10 of an extruder 3 to coat the heated and melted outside surface of the polyethylene pipe P1 and integrally welded to the outside surface of the polyethylene pipe P1 to form a thick-walled polyethylene pipe P. It is more suitable to evacuate the space formed before the molten surface of the polyethylene pipe P1 and discharged molten polyethylene are closely bonded. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
申请公布号 |
JP2005153412(A) |
申请公布日期 |
2005.06.16 |
申请号 |
JP20030397748 |
申请日期 |
2003.11.27 |
申请人 |
MESCO INC |
发明人 |
KUDO KAZUYUKI;KAWANO SHOJI;SATO SHINGO |
分类号 |
F16L9/12;B29C47/02;B29K23/00;B29L9/00;B29L23/00;(IPC1-7):B29C47/02 |
主分类号 |
F16L9/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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