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.
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.
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