In2018, Russian customers purchased plastic sheet equipment from our company for the second time. This customer has cooperated with our company for many years and has been satisfied with the quality of our equipment.
In the plastic sheet extrusion process, the thermoplastic material in the form of beads into the extruder barrel from a hopper mounted at the top. Additives such as colorants and UV inhibitors (in liquid or pellet form) are usually used, which can be mixed into the resin before reaching the hopper or added through a co-extruder.
The material enters and contacts the screw through the feed throat. Rotating the screw causes the plastic beads to enter the barrel forward, and the barrel is heated to the melting temperature required to melt the plastic.
In most processes, a heating curve is set for the barrel, and three or more independent PID control heating zones gradually increase the temperature of the barrel from the rear (where the plastic enters) to the front. This allows the plastic beads to gradually melt as they are pushed through the barrel and reduces the risk of overheating that can cause polymer degradation.