发明名称 |
Method of making internally cross-ribbed plastics material structure |
摘要 |
A unitary tubular product having an inner layer and an outer layer connected together by a bi-planar mesh formed of helical ribs bonded at their cross-over points is produced in a single coaxial tubular extrusion process, the structure being integrally or confluently extruded. The extruder die head has annular flow channels having closely-spaced die grooves.
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申请公布号 |
US4521368(A) |
申请公布日期 |
1985.06.04 |
申请号 |
US19830510253 |
申请日期 |
1983.07.01 |
申请人 |
NETLON LIMITED;ROYAL PACKAGING INDUSTRIES VAN LEER B.V. |
发明人 |
MERCER, FRANK B.;MARTIN, KEITH F. |
分类号 |
B29C49/00;B29B7/00;B29C47/00;B29C47/02;B29C47/06;B29C47/24;B29C47/26;B29C63/00;B29C65/00;B32B37/00;(IPC1-7):B29D23/04 |
主分类号 |
B29C49/00 |
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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