Children's table chairs on the white plastic tray for a long time useless, there is a place to darken, how to deal with ah?
The finished products are prone to oxidation deterioration of the material3, the material contact acid, alkali, salt will happen this situation
Stop in accordance with the conventional methods, the die head and the inlet ends are not to take effective measures to seal, causing the air into the machine to produce oxidation residue in plastic machine to heat deterioration aggravating, provide favorable conditions for carbonization. Because the equipment is plastic and metal structure, the thermal expansion rate difference has carbonization of plastic to metal adhesion reduced, easy to fall off from the device to the inner wall of the cylinder head, and the inner wall of the screw, into the plastic melt, resulting in products inside and outside wall black spots, prone to quality problems such as leakage current or piercing.
In the actual production of plastic products, usually in the front of the separation of feed inlet, excluding extruder and the head of plastic melt, turn off the temperature in all districts, and then turn off the power supply. Because the plastic melt has strong adhesion of metal, each stop can not be absolutely completely ruled out, finally there is a thin layer of plastic melt is tightly attached to the extruder barrel and die wall and screw, stranded in the condition of high temperature in long time after natural cooling and heating equipment in the course of the next time obviously, the thermal degradation, gradually turn yellow, zoom into carbide.
