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    • 3. 发明申请
    • MULTILAYER PIPE
    • 多层管
    • WO1997033116A1
    • 1997-09-12
    • PCT/SE1997000302
    • 1997-02-24
    • BOREALIS A/SEK, Carl-GustafSANDBERG, HansLINDSTRÖM, Helge
    • BOREALIS A/S
    • F16L09/133
    • F16L11/04F16L9/133F16L57/02
    • A multilayer pipe with improved resistance to rapid crack propagation is described. The pipe consists of at least two, preferably three layers of different polyolefin plastic materials, which are so selected and combined that the pipe has resistance to rapid crack propagation, measured as the critical temperature, which is the lowest temperature at which a crack initiated in the pipe propagates a distance in the pipe of at most 4 times the diameter of the pipe, which is lower than the weighted average value of the critical temperatures of single-layer pipes of the individual plastic materials included in the multilayer pipe and having the same dimension as this. The pipe preferably has a critical temperature below -15 DEG C and consists of olefin plastics, such as polyethylene plastic and polypropylene plastic.
    • 描述了具有改进的抗快速裂纹扩展的多层管。 该管由至少两个,优选三层不同的聚烯烃塑料材料组成,它们被选择和组合,使得管具有抵抗快速裂纹扩展的抗性,其作为临界温度测量,临界温度是开始裂纹的最低温度 管道在管道中传播的距离最多是管道直径的4倍,低于多层管中包含的各种塑料材料的单层管道的临界温度的加权平均值,并具有相同的距离 尺寸如此。 该管优选具有低于-15℃的临界温度并且由烯烃塑料如聚乙烯塑料和聚丙烯塑料组成。