PET bottles have certain processing and production meth […]
PET bottles have certain processing and production methods, and the processing methods mainly include extrusion, injection molding, calendering, blow molding, molding, lamination, casting, and the like. The PET bottle is processed by PET bottle preform blow molding, which is to melt and melt the PET and then press it into a special blow mold. At the same time, there is air pressure in, and the PET is pressed on the mold to form the final product shape. Since the bottle is subjected to outward pressure in forming, the internal stress of the bottle itself is inward. When the temperature of the heating reaches a certain level, the PET is softened, and the resistance of the internal stress is reduced so that the bottle becomes smaller.
PET bottles have certain processing characteristics in processing and production and are processed according to certain methods of processing, ensuring good quality and performance in production and processing. The following describes the processing characteristics of PET bottles of different aspects:
1, shrinkage rate
Reinforced PET shrinkage is smaller than normal pressure PET, which consists mainly of heat shrinkage and chemical structure shrinkage. The factors affecting shrinkage are first of all PET species. Generally, phenolic is larger than epoxy, epoxy phenolic, unsaturated polyester, etc., and unsaturated polyester material has the smallest shrinkage. Other factors affecting shrinkage are the shape and wall thickness of the plastic part, and the thick wall shrinks greatly. The PET contains a large amount of filler and glass fiber, and the shrinkage is small. When the content of volatile matter is large, the shrinkage is large, the molding pressure is large, and the loading amount is large. The shrinkage is small, the hot mold release has a larger shrinkage than the cold mold release, and the curing is insufficient to shrink. The shrinkage rate of PET bottles is one of the important factors affecting the use of PET bottles. To use, the shrinkage rate of PET bottles should be reduced to prevent important shrinkage during use and affect the actual use.
The fluidity of the reinforcing material is worse than that of the general pressure PET. When the fluidity is too large, the resin loss and the accumulation of the glass fiber are easily generated. If it is too small, the molding pressure and temperature will increase significantly. There are many factors affecting liquidity. To assess the fluidity of a certain material, it must be analyzed according to the composition factors affecting liquidity.
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