真空定型造成的负压和严重冷却也是生产过程中PPH管产生内应力的主要原因之一，PPH管的管壁一般较厚，定径套管应具有足够的长度，其长度应比普通的聚丙烯和聚乙烯管长。真空喷淋冷却水箱还应具有水温控制装置，温度不超过17℃，冷却水箱总长度为24-30m，每个水箱长度为6m，每一段水箱都应配备温度控制装置，以保证梯度冷却效果。PPH管的塑化材料进入模具，熔化后的材料通过合理的模具结构成型。

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