(1) The temperature of each section on the barrel of the plastic sheet production equipment increases gradually from the feeding section to the junction of the barrel and the molding die.
(2) The molding mold temperature is slightly higher than the barrel temperature. The higher temperature is controlled at 5---10°C. The temperature at both ends of the mold is slightly higher than any temperature in the mould, and the higher temperature is controlled at 5-10°C.
(3) In the sheet form, the upper roll surface of the middle roll of the three rolls should be on the same level as the lower plane of the mold lip; the end surface of the lip is parallel to the center line of the middle roll, with a distance of 50~100mm.
(4) The gap between the die lips should be slightly smaller than or equal to the thickness of the plate product, and the gap between the die lips should be slightly smaller than the gap between the die lips on both sides.
(5) Note that the roughness R of the three-roll working surface should not be greater than 0.2pm. When cleaning the roll surface, it is not allowed to scratch the roll surface with a hard steel knife, and a copper knife should be used to clean the residual material on the roll surface.
