What should I pay attention to when molding PET bottles?
Do not use excessive dwell time to prevent molecular weight loss. Try to avoid temperatures above 300 degrees celsius. If the stop is less than 15 minutes. Only for empty handling; if more than 15 minutes, then use viscosity PE cleaning, and the cylinder temperature to PE temperature, until the boot.
PET because of the short time after the melting point, and the melting point is higher, so we need to choose more temperature control section, plasticizing, self friction less heat injection system, the actual weight of the product can not be less than the amount of machine injection
Because PET macromolecules contain lipid groups and have certain hydrophilicity, the pellets are sensitive to water at high temperature. When the moisture content exceeds the limit, the molecular weight of PET decreases during processing, and the products become brittle and brittle. In this case, the material must be dried before being processed. The drying temperature is 150 degrees centigrade and more than 4 hours. The temperature is usually 170 DEG C and 3-4 hours. The air can be used to check whether the material is completely dry.
