... years Tencheng has been committed to the research, development and design of extrusion die and complete equipment of plastic machinery. So we take ... the manufacture of single-layer, double-layer and multi-layer of plastic materials like PVC, PS, OPP, PO, PP, PE, EVA, PC ... for PP, PE, PS, ABS, PMMA, PVC and so on. Adopt different length to diameter ratios and compression ratios in screw aiming at ...