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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

Plastic Pet Mold - How to Make a Valve Gate, Crystalline, Or Hot Runner MoldWhen it comes to plastic pet mold, you have a few  This mold is designed with a hot runner and a valve gate system. The hot runner heats the resin and dispenses it into the cavity as the gate opens and closes. The valve gate system helps prevent melt from escaping through  t hot runner mould Manufacturers he narrowing gap, preventing splay in molded parts.The sequential valve gate method is a proven method of filling molds and has a host of benefits. It's a proven technique for improving dimensional stability and preventing gas bubbles, while allowing for higher flexibility. It also results in a shorter cycle time and lower costs, which increases production. But what makes it such a great choice for pet products? Here are three advantages of this method:Crystalline PET moldThe process to make a crystalline PET mold involves preparing the plastic powder in advance. This powder, called T1, was pre-dried in an oven at 130 degrees C for three hours before it was put in the laboratory machine. This pre-drying step ensures that the powder is free of air bubbles and contaminates. During the molding process, the mold must be kept at the right temperature to maintain its structure and resolution.When creating a crystalline PET mold, it is important to manage the temperature gradient inside the mold. The gradient should range from 270 to 280 degC to between 5 and 15 degrees C. While the molding material should be properly dried before using it, there may be a need to modify the temperature management to avoid deformation. This can be a challenge when the mold is made of an incompatible material. Once the plastic has begun solidifying, the temperature must be carefully monitored.Injection pressure of PETWhen it comes to injection molding PET, the temperature gradient in the plastic mold is a critical consideration. The temperature gradient for PET plastic must be controlled between 270 an,hot runner mould ...ادامه مطلب