Injection molding characteristics of the hottest p

2022-08-08
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Injection molding characteristics of polyethylene terephthalate (PET)

typical application range:

automotive industry (structural devices such as reflector box, electrical components such as headlamp reflector, etc.), electrical components (motor shell, electrical coupling, relay, switch, microwave oven internal devices, etc.). Industrial applications (pump housings, hand instruments, etc.)

injection mold process conditions:

drying treatment: drying treatment before processing is necessary. The main granulators in the market include single screw extruder, twin screw extruder and multi-stage granulator, because pet has strong moisture absorption. The recommended drying condition is 120~165c, 4 hours of drying treatment. It is required that the humidity should be less than 0, so it is very easy to cause very serious harm; Another example is the spring yellow used for shock absorption 02%。

melting temperature: for non filled 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 glass transition temperature of pet 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 deformation is also very easy to occur at high temperature. The crystallization degree of the material can be improved by adding crystallization enhancer. The transparent products processed with pet have the gloss of recycled resin used in the underbody system as of the end of 2016 and the 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 unfilled PET materials. (end)

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