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1. 发明授权

US4485057A Method of producing insulated pipeline components 失效
标题翻译：绝缘管道部件的生产方法
公开(公告)号：US4485057A
公开(公告)日：1984-11-27
申请号：US466862
申请日：1983-02-16
申请人： Olle Kristensson , Bo R. G. Nystrom
发明人： Olle Kristensson , Bo R. G. Nystrom
IPC分类号： F16L59/04 , F16L59/22 , B29D27/04
CPC分类号： F16L59/04 , F16L59/22
摘要： Insulated pipeline components are produced by positioning a steel pipe in the cavity of a casting mold with the pipe ends protruding therefrom. The dimensions of the cavity are greater than those of the inner pipe, and in the space between the inner pipe and the contact surfaces of the mold cavity a plastic powder is introduced, the powder being melted by heating of the mold. The mold is then rotated in a manner well known in rotational molding technique so that centrifugal force drives the molten plastic material against the contact surfaces of the mold cavity to form a plastic jacket; and after the mold has cooled the component is removed and expandable plastic material is supplied to the space between the inner pipe and the plastic jacket and is foamed. The resulting component has an exactly centered inner pipe, lacks conventional joints and can be produced at relatively low cost in a manner complying with industrial safety requirements.
摘要翻译：绝缘管道部件通过将钢管定位在铸模的空腔中，管端从其突出而制造。空腔的尺寸大于内管的尺寸，并且在内管和模腔的接触表面之间的空间中引入塑料粉末，通过加热模具来熔化粉末。然后以旋转模塑技术众所周知的方式旋转模具，使得离心力将熔融的塑料材料驱动抵靠模腔的接触表面以形成塑料护套; 并且在模具冷却之后，去除组件，并且将可膨胀的塑料材料供应到内管和塑料套之间的空间并发泡。所得到的部件具有精确对中的内管，缺少常规接头，并且可以以符合工业安全要求的方式以相对较低的成本生产。

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