发明名称 TUBE FORMED BY SEVERAL LAYERS
摘要 <p>Multilayered plastic pipe of at least two layers of different plastic material consists of polyolefin plastic having resistance to rapid crack propagation expressed as the critical temperature of the pipe. The critical temperature of the pipe is lower than weighted average of the critical temperature of the single-layer pipes of the individual plastic material, differing by at least 5 deg C. A crack initiated in the pipe propagates a distance of at most 4 times the diameter of the pipe at a pressure difference of 0.5 MPa between inside and outside of the pipe.</p>
申请公布号 CZ9802734(A3) 申请公布日期 1999.04.14
申请号 CZ19980002734 申请日期 1997.02.24
申请人 BOREALIS A/S 发明人 EK CARL-GUSTAV;SANDBERG HANS;LINDSTROM HELGE
分类号 F16L9/133;F16L11/04;F16L57/02;(IPC1-7):F16L9/133 主分类号 F16L9/133
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