The proportion of recycled material is generally not more than 25%, and the recycled material needs to be completely dried. We can use air injection method to examine whether the material is completely dry or not. Therefore, we need to dry the material at 150 Celsius degree for more than 4 hours and 3 to 4 hours at 170 Celsius degree before processing. When the water content exceeds the limit, the molecular weight of the PET will drop during the processing, so the product will be colored and become crisp. The aggregate is very sensitive to water when it’s at a high temperature. Plastic dryingĭue to PET macromolecule contains an aliphatic base, it has certain hydrophilicity. Therefore, we change the rheological property mainly from the pressure. PET has a good rheological property in molten condition and pressure has more effects on viscosity than temperature does. PET injection molding parts are mostly used in the bottle preform products At present, GF-PET is used by most clients. The chemical name of PET is poly terephthalic acid alcohol ester, also called polyester. The injection techniques of poly terephthalic acid alcohol ester (PET)
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