Plastic bottles have a certain production process and method during production. Plastic bottle processing methods include: extrusion blow molding, injection molding, calendering, blow molding, molding, lamination, casting, and many other methods.
There are two commonly used production processes for plastic bottles: the first is the extrusion blowing process, that is, the plastic raw materials are added to the extruder, heated and melted to plasticize the molten parison, and then placed in the bottle mold for inflation molding and cooling After setting, take it out from the mold and get the finished product after removing the scrap. This process is mainly used to produce polyethylene, polyvinyl chloride plastic bottles, such as milk bottles, soy sauce bottles, etc. The second is the injection stretch blow molding process, that is, the plastic raw material is injection molded into a tubular parison by an injection molding machine, and then placed in a bottle mold to be stretch blow molded, and cooled to obtain a finished product. This process is mainly used to produce PET plastic bottles, such as mineral water bottles.
The plastic bottle is blown after passing, the plastic is heated and melted, and then pressed into a special blow mold and the internal air pressure, pressure, and mold plastic form the shape of the final product, because the shape of the bottle is outwardly pressed for time It is emphasized that when the bottle itself is inward, the heating temperature reaches a certain level, it will soften the plastic, and the pressure resistance becomes smaller, so the bottle will become smaller and smaller.
Plastic bottles processed and produced with certain processing characteristics are processed in accordance with certain grace period processing methods to ensure the quality and performance of production and processing. The following are some plastic bottles with different processing characteristics: characteristic one, high shrinkage
Reinforced plastics have lower shrinkage than general pressure plastics, which is mainly composed of contracted components and thermal shrinkage of the chemical structure. Factors affecting the shrinkage of the first plastic variety. It should be larger than the general epoxy novolac, epoxy novolac, unsaturated polyester, etc., and the smallest shrinkable unsaturated polyester material among them. Then shrinkage and other factors affect the shrinking shape and wall thickness of plastic parts, large thick walls,
Fillers such as plastic and fiberglass contain a small volume shrinkage, and the volatile content is also very suitable for large shrinkage, forming pressure, volumetric load shrinkage, heat shrinkage than large cold, lack of a large shrinkage and solidified peeling peel.
One of the important factors that affects the use of plastic bottles to reduce shrinkage and prevent the use of shrinkage is an important phenomenon, which affects the actual use effect. The second characteristic is that the fluidity is strong, the flow rate of the reinforced plastic material is lower than the average pressure, and the liquid resin is prone to excessive accumulation and glass loss respectively. If it is too small, the resulting pressure and temperature will increase significantly.
Many factors affect the flowability, in order to evaluate the flowability of certain materials, a specific analysis must be made. Factors affecting liquidity.