... , PE,PP,ABS sheet plastic sheet extrusion production line( PVC, PET , PP,PE,PS,ABS) One.Introduction The plastic sheet or board extrusion ... 4. the thinkness of sheet or board is precisely adjusted by adjusting the screws and double directional regulating oil pressure ... 6. the thinkness of sheet or board is precisely adjusted by adjusting the screws and double directional regulating oil pressure wheels ...