介绍了共挤出的PVC芯层发泡管的工艺流程和模头装置，并讨论了共挤管材的原材料选择及配方构成。
The processing technology and coextrusion die design of PVC foam core pipes are introduced. Also the selection of raw materials and design of formulation are discussed.
在电缆绝缘缆芯外挤包一层堵水材料，不仅可改善电缆的电气性能。而且可降低电缆材料的成本。
A water barrier was extruded on the insulation layer of electric cable to improve electric property and to lower the cost.
缆芯外挤上一层聚乙烯内护套，双面涂塑钢带(psp)纵包后挤制聚乙烯护套成缆。
After the PSP is longitudinally applied over the inner sheath, the cable is completed with a PE outer sheath.
缆芯外挤上一层聚乙烯内护套，双面涂塑钢带(psp)纵包后挤制聚乙烯护套成缆。
After the PSP is longitudinally applied over the inner sheath, the cable is completed with a PE outer sheath.
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