1) The raw material itself is poor in color and brightness, and it has changed after being plasticized at high temperature.
(2) The service life of the production equipment is too long, causing the aging of the twisting screw, poor plasticization ability, and color change.
(3) The uneven temperature control of the equipment causes local temperature to be too high. It is recommended to replace a new thermocouple and adjust the temperature zone control data update in time.
(4) After the surplus material remaining in the production of plastic barrels is crushed, the ratio of impurities to the raw materials is too large, causing color change.