Helical pipes and method of manufacture thereof
    1.
    发明授权
    Helical pipes and method of manufacture thereof 失效
    螺旋管及其制造方法

    公开(公告)号:US5111849A

    公开(公告)日:1992-05-12

    申请号:US456366

    申请日:1989-12-26

    申请人: Bernhard Zeh

    发明人: Bernhard Zeh

    摘要: Extruded pipes of thermoplastically processable polymers are wound cold around a mandrel and thereafter subject to thermal fixing. During or before winding, the pipe is twisted in a direction opposite to that of the helix formation, about its longitudinal axis, preferably through angles of 5.degree. to 360.degree. per coil. The resilience of the coiled pipe is surprisingly improved to the point where the resilience factor R approaches 1.0.

    摘要翻译: 将热塑性可加工聚合物的挤出管缠绕在心轴周围,然后进行热固定。 在卷绕期间或之前,管道以与螺旋形地层相对的方向围绕其纵向轴线扭转,优选地为每圈5°至360°的角度。 螺旋管的弹性惊人地提高到回弹系数R接近1.0的程度。