国际上现有三种制造夹砂压力管的工艺方法。它们分别是，交叉缠绕工艺、连续缠绕工艺和离心浇铸工艺。

The three most commonly used method of manufacturing FRP are Cross-winding process, continuous winding process and the centrifugal casting process.

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本文介绍了PLC控制系统组成、浇铸工艺流程、及PLC在离心球墨铸管机中的控制原理。

This paper discusses PLC control system formation, casting technical process and control theory of PLC in centrifugal casting iron pipe machine.

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201不饱和聚酯树脂是专门为离心浇铸成型玻璃钢管道(HOBAS管)设计的结构层树脂，是低粘度，中等反应性的邻苯型树脂。

HCH-201 unsaturated polyester resin is designed for centrifugal casting molding glass pipe (HOBAS pipe) design of the structure layer resin is a low viscosity, medium reactivity of o-benzene resin.

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