(1) The preparation and drying of the material can affect the clarity of the goods due to the presence of any impurities in the plastic, which can affect storage and transportation. During the feeding process it is necessary to take care of sealing to ensure the cleanliness of the material. Drying is particularly important when the material contains moisture, as heating can cause the material to transform, and a dry hopper is used when adding material during the injection molding process. It should also be noted that the input air should be filtered and dehumidified during the drying process to ensure that it does not contaminate the material. Drying process of Tong Ming Plastic: Information \ Process Drying Temperature (℃) Drying Time (h) Layer Thickness (mm) Whitening PMMA70-802-430-40pc120-130>6<30 Select hot air circulation drying PET140-1803-4 Select continuous drying feeding equipment is preferred.

(2) To avoid material contamination and the presence of old materials or impurities in the recesses of the screw and its attachments, as well as the presence of resins with poor thermal stability, the barrel is cleaned, and the screw and its attachments are cleaned with a screw cleaner prior to use and after shutdown in order to clean all parts and prevent the adhesion of impurities. When screw cleaner is not available, PE can clean the screw with a resin such as PS. When the machine is temporarily shut down, in order to avoid the material to stay in high temperature for a long time, which may lead to temperature drop, the temperature of the dryer and barrel should be lowered, such as the temperature of PMMA and other barrels of PC should be lowered to below 160 ℃. the temperature of the hopper of PC should be reduced to below 100 ℃.

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