聚甲基丙烯酸甲酯(P MMA )/聚氯乙烯(PVC)表面复合异型材(以下简称复合异型材)是通过共挤出模头成型，以共挤出模头出口处复合异型材截面上各子区域的流速相等为优化目标，以对流动均匀性有较大影响的压缩段间隙为设计变量，有限元数值分析模拟并和 ERP 系统及并行工程的 CAD/CAE 网络系统挤出模头专家数据库相结合，通过实例设计优化证明，优化后共挤出模头出口处复合异型材熔体各区域流速均匀性显著提高，复合异型材的型胚质量显著提高，其结构尺寸、性能完全符合要求。
Polymethyl methacrylate(PMMA)/polyvinyl chloride (PVC)surface composite profile (hereinafter re-ferred to as composite profile)took the equal flow velocity of each sub-domain on the cross section of the com-posite profile at the outlet of the coextrusion die as the optimization target through coextrusion molding.The compression gap that had a huge influence on the flow uniformity was taken as the design variable.The finite el-ement numerical simulation was combined to the ERP system and expert database of the CAD/CAE network system extrusion die in the concurrent engineering.It was testified by the case design optimization that the flow velocity uniformity of each region in the composite profile melt at the outlet of the optimized coextrusion die has been improved greatly,the embryo quality of the composite profile has been improved,and its structure size,as well as the performance satisfies the demands well.
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