SINO PET Preform Production Lines
PET preform mould is a special mould in plastic moulds, there are many considerations in mould design, tooling, machine adjustment. SINO PET preform production lines with more than 20 years'experience, can provide a very good reference. 1. Dispose of PET plastic PET plastic material has hydrophilia, sensitive to water at high temperatures. When the moisture content exceeds the limit, PET preforms will be embrittled. Therefore, PET plastic materials must be dried before production, the drying temperature is 150℃, time of drying should be over 4 hours. If drying temperature is 170℃, time of drying should be 3 to 4 hours. 2. Mould and sprue design PET preform mould usually use hot runner system. It will be better to have a thermal baffle between mould and injection molding machine, the thickness of thermal baffle should be around 12mm, can withstand high pressure. To avoid local overheating or fragmentation, exhaust must be adequate, but the depth of the exhaust port is genera...