The hottest polyethylene terephthalate molding pro
2022-10-15- Detail
Polyethylene terephthalate molding process
Pet polyethylene terephthalate
typical application range
automotive industry (structural devices such as reflector box, relevant data provided to people, electrical components such as headlamp reflector, etc.)
Electrical components (motor shell, electrical coupling, relay, switch, internal components of microwave oven). Industrial applications (pump housings, hand instruments, etc.)
injection molding process conditions
drying treatment: drying treatment before processing is necessary because pet has strong moisture absorption. The recommended drying condition is 120~165c, 4 hours of drying treatment. The humidity shall be less than 0.02%. Melting temperature: for unfilled type: 265~280c; For glass filling type: 275~290c. Mold temperature: 80~120c
injection pressure: 300~1300bar. Injection speed: a higher injection speed can be used without causing embrittlement. Runner and gate: all conventional types of gates can be used. The gate size should be 50~100% of the thickness of the plastic part
chemical and physical properties:
the lower the ratio of ether bond to ketone group (e/k) in the molecular chain of P, the glass transition temperature of ET is about 165C, and the crystallization temperature range of the material is 120~220c. Pet has strong hygroscopicity at high temperature. For Glass Fiber Reinforced PET materials, bending is also very easy to occur at high temperature. 1. The fixture equipped with the machine should be coated with antirust oil for storage; Curvature deformation. The crystallization degree of the material can be improved by adding crystallization enhancer. Transparent products processed with pet have gloss and heat distortion temperature. Special additives such as mica can be added to pet to minimize bending deformation. If a lower mold temperature is used, transparent products can also be obtained by using graphically graphically unfilled PET materials
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