The manufacturing process of transparent plastics
Release time:
2024-03-21
（1） The preparation and dryness of materials can affect the clarity of goods due to the presence of any impurities in plastic, thus affecting storage and transportation. During the feeding process, it is necessary to pay attention to sealing to ensure the cleanliness of the material. Especially when the material contains moisture, heating can cause the material to transform, so it must be dry, and it is necessary to use a dry hopper when adding materials during injection molding. It should also be noted that during the dry process, the input air should be filtered and dehumidified to ensure that it does not contaminate the material. The drying technology of Tongming Plastics: Data \ Technology Drying temperature (℃) Drying time (h) Material layer thickness (mm) Whitening PMMA70-802-430-40pc120-130>6<30 Choose hot air circulation drying PET140-1803-4 Choose continuous drying feeding equipment is preferred.
（2） To avoid material contamination and the presence of old materials or impurities in the depressions of the screw and its accessories, as well as the presence of resin with poor thermal stability, the cleaning of the barrel, screw and its accessories is carried out using screw cleaning agents before use and after shutdown to clean all parts and prevent impurities from sticking. When there is no screw cleaning agent, PE can be used PS and other resin cleaning screws. When the machine is temporarily shut down, in order to avoid the material staying at high temperatures for a long time, which may cause a drop in temperature, the temperature of the drying machine and the machine barrel should be lowered, such as PC The temperature of the PMMA and other machine barrels must be reduced to below 160 ℃. The temperature of the hopper should be reduced to below 100 ℃ for PC.
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