发明名称 Multi-layer pipe and method for its manufacture
摘要 A method for manufacture of a multi-layer pipe (5) by means of a bending roller with individual material layers (1, 2) to be combined into the multi-layer pipe (5) being placed one upon the other, and the multi-layer material thus formed being shaped into a multi-layer pipe (5) by means of the bending roller, and in the final stage of pipe shaping in the bending roller and/or a subsequently used bending machine a material layer (1) acting as an internal pipe being pressed non-positively into a material layer (2) acting as an external pipe.
申请公布号 US8117882(B2) 申请公布日期 2012.02.21
申请号 US20050721467 申请日期 2005.12.16
申请人 BERG BERND;BERGROHR GMBH SIEGEN 发明人 BERG BERND
分类号 B21D3/00;B21D9/00;B21D31/00 主分类号 B21D3/00
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