Pet Bottle Preform have certain processing and production methods. The processing methods mainly include extrusion, injection molding, calendering, blow molding, molding, lamination, casting, and the like. The pet bottle is blow-molded, which is heated and melted and then pressed into a special blow mold. At the same time, there is air pressure inside, and the pet is pressed onto the mold to form the final product shape.

Since the bottle is subjected to outward pressure during 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. The pet bottle has certain processing characteristics in processing and production, and is processed according to a certain way, to ensure good quality and performance in production and processing.

The following describes the processing characteristics of the pet bottle in different aspects: the shrinkage rate is enhanced. The shrinkage rate of pet is smaller than that of the general pressure pet. It is mainly composed 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 thickness of the plastic part, and the thick wall shrinks greatly. The content of filler in the pet and the large amount of glass fiber shrinks little, 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. In use, the shrinkage rate of pet bottles should be reduced to prevent important shrinkage during use and affect the actual use effect.


The fluidity of the fluidity enhancing material is worse than that of the general pressure, and when the fluidity is too large, the resin loss and the fiber fiber accumulation are likely to occur. 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.


Jilian mold has rich experience in making pet products. We have a rich and complete product line to meet your needs in this area, from 5-Gallon Pet Preform to caps, handles, etc. Welcome everyone to choose us.