4. Melt temperature
PET bottle can be measured by air shot. At 270-295 degrees, the enhanced GF-PET can be set to 290-315 degrees centigrade.
5. Injection speed
Generally, the injection speed is fast, which can prevent premature solidification. But too fast, the shear rate is high, so that the material is fragile. The shot is usually completed in 4 seconds.
6, back pressure
The lower the better, so as not to wear. Generally no more than 100bar. Usually no use.
7. Detention time
Do not use too long detention time to prevent molecular weight loss. Try to avoid temperatures above 300 degrees Celsius. If the shutdown is less than 15 minutes. Only for air injection treatment; if more than 15 minutes, then clean with viscosity PE, and the barrel temperature to PE temperature, until restart.
8, PET bottle matters needing attention
(1) the recycled material should not be too large, otherwise it will easily produce "bridging" at the blanking place and affect the plasticization.
（2）If the mold temperature control is not good or the material temperature control is not proper, it is easy to produce "white fog" and opaque. The mold temperature is low and uniform, the cooling speed is fast, the crystal is few, and the products are transparent.
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