发明名称 |
Continuous production of helically corrug- - ated pipes |
摘要 |
Lightweight corrugated pipes are produced by forming undulated depressions and elevations in a flat strip of the material and helically winding the latter and connecting adjacent strip edges. - The stretched flat strip is first pre-corrugated with incomplete depressions and subsequently the corrugating operation is completed, prior to bending into pipe shape.
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申请公布号 |
DE1926971(A1) |
申请公布日期 |
1970.11.26 |
申请号 |
DE19691926971 |
申请日期 |
1969.05.23 |
申请人 |
MANNESMANN AG |
发明人 |
HEINZ HOLDER,DIPL.-ING.;LECKNER,HEINZ-WERNER;WALTER,EDMUND;SIXT,WOLFGANG |
分类号 |
B21C37/12;B29C53/26 |
主分类号 |
B21C37/12 |
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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