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The process of making PET bottles starts with a properly designed preform. The preform design must be based on the cap mould/mold finished bottle's dimensions and the stretchability of the PET grade. A preform is then heated and conditioned before being placed in a PET bottle blowing mould. The preform is blown with very little initial expansion due to the low-pressure air inside the blow mold.A properly designed PET preform prevents pearlescence, a defect in the appearance of the finished product. The pearlescent part of the bottle is the inner part of the preform. A correctly designed preform allows the PET material to stretch and crystallize properly. A properly designed preform IV allows you to easily find the appropriate RHB temperature setting. A poorly designed preform causes pearlescence.Improperly designed preform causes micro-fracturing of the PETDuring blow molding, a PET bottle develops folds at the bottom, where the un-stretched materials collect. The preform's lower bulge creates a cavity where the rod contacts the bottom of the preform. The thickness of the rod that touches the bottom of the preform starts the defect. The material that is deposited at the bottom of the preform becomes affected when the rod is stretched too thin.Low pressure base reduces risk of stress crackingThe design of the base mold affects stress cracking resistance. A well-heated base will produce a thinner and wider base clearance, but will also leave the mould hotter. Moreover, the thickness of the base wall will affect the base clearance. Both of these factors are crucial in determining the stress crack resistance. Moreover, the temperature and reheat lamp settings of the base mold will also determine its resistance to stress cracking.Another factor to consider when choosing a PET BOTTLE blowing mould is its air consumption. The highest cost of blowing bottles is air, so it is essential to pay attention to how much air your mould is using. By following the m,cap mould,mold ...ادامه مطلب