Reasons For Rough Surface Of Pet Bottle Preform

Surface roughness means that the surface of the Pet Bottle Preform lacks precision or the level of precision of the entire surface is inconsistent, for example some areas are brighter than others. The main cause of surface roughness may be injection molding machines, molds, processes or materials. (1) Injection molding machine 1 insufficient supply of materials; 2 The barrel is not thoroughly cleaned when refueling; 3 Check for leaks of cold melt at the nozzle; (2) mold 1 the gate is too small, or the runner is too thin - increase the gate size, or use a film gate; 2 cavity surface roughness - sanding the cavity surface to check for leaks; 3 poor ventilation - increase the vents in places with poor gloss to improve the situation; 4 increase the size of the cold slug or add a cold slug to collect cold material; 5 mold temperature is too low - increase the mold temperature; 6 may be affected by the release agent - stop the application of the release agent; (3) Injection molding process 1 Increase the melt temperature (check whether the heating zone of the barrel is confusing - the temperature is not uniform, the local temperature is too high or too low, etc.); 2 increase the nozzle temperature; 3 overcut caused by overspeed injection - appropriate reduction of injection speed; 4 increase the injection pressure; 5 increase the injection time; (4) Raw materials 1 raw materials are not dried; 2 too much recycled material is added, or the recycled material is decomposed repeatedly; 3 release agent is used excessively. Jilian Plastic Mould is a manufacturer of prefabricated plastic preforms with many years of experience. We can provide you with more protection. With a professional, we can provide you with higher quality 5-Gallon Pet Preform. Customers who have a need are welcome to contact us.