发明名称 |
PROCESS FOR FORMING PIPE OF IMPROVED CONSTRUCTION |
摘要 |
A plastic pipe of an improved construction such that the pipe has apertures formed therein when the pipe is viewed in cross section, the pipe being made by a process including extruding a hot plastic flow through a die head (17) having a plurality of first sized gaps and second sized gaps, the second sized gaps having an aperture located inside each gap. A die (15) is secured to a manifold assembly (10), with the manifold assembly (10) having sets of tubes located centrally of one another, each set of tubes including a water inlet tube (150), a tube through which a vacuum is pulled (140) and a water return tube (130). Each set of tubes is positioned longitudinally within a respective die manifold tube (165) which extends through the die (15). |
申请公布号 |
CA2187324(A1) |
申请公布日期 |
1995.10.19 |
申请号 |
CA19952187324 |
申请日期 |
1995.04.07 |
申请人 |
ADVANCED DRAINAGE SYSTEMS, INC. |
发明人 |
WISE, JOHN;MARTIN, LARRY L. |
分类号 |
B29C47/00;B29C47/88;F16L9/18 |
主分类号 |
B29C47/00 |
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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