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Injection molding is one of the common methods for forming PET preforms. The molten PET material is injected into the mold by an injection molding machine and then cooled to form the shape of the preform. Injection molding can control the size and shape of the preform. Production efficiency is suitable for large-scale production. The design and manufacturing accuracy of the mold have a great influence on the quality of the preform, including the uniformity of the wall thickness of the preform and the dimensional accuracy of the bottle mouth. In the injection molding process, it is necessary to control the injection pressure, injection speed, mold temperature and other process parameters to ensure the stable quality of the preform.
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