PET is the abbreviation of polyterephthalic acid. The forming principle of PET bottle is divided into two types, injection stretch blow molding and extrusion stretch blow molding. The former is more widely used in process.
The forming principle of the pet bottle is to expand the preform volume according to the contour of the mold by the blow molding machine under high temperature and high pressure conditions in the mold, thereby forming a hollow packaging container with a certain shape and cooling, and then cooling the mold release, with the growth of the blowing technology. The mold grows and the yield is extremely increased. It can process tens of thousands of pet bottles per hour, and all the computer program control system is changed, which increases the stability of the process. The important factors affecting the blow molding process of the PET bottle are temperature control. , heating environment, pre-blowing, etc. Pet Preform and pre-blowing should be noted that the preforming principle of preforms is similar to that of pet bottles. The difference is that the molds and equipment are different. The preforms are hollow specimens that are injected into the mold of the injection molding machine and then formed by high temperature and high pressure. The molecular weight viscosity should not be too low, otherwise it will be easily damaged during the blow molding process. The processing technology of the preform is more mature, and the production efficiency is almost 10 times that of the pet bottle. The influencing factor of the pre-blowing is mainly the flow rate, that is, the feed rate. Should not be too fast, should be the machine processing peak is lower 1/4, domestic equipment (injection molding machine, blow molding machine) are mostly manufactured in Germany and France, have preform supply system, temperature control system, host system, The heating system and the auxiliary manual control system are composed of five parts. With the advancement of the machine and equipment, the manual operation is very important, the program parameters are set, and the automatic production is very stable.
PET material has hygroscopic properties, so in the air, pet preforms or pet bottles will absorb moisture in the air, should be stored in a dry and ventilated place, pet bottles generally have poor heat resistance, mostly used for cold filling, but By changing the mold and changing the shape of the pet bottle, hot filling below 145 degrees Celsius can be achieved.
PET bottles are widely used in beverage packaging, pharmaceutical packaging, cosmetic packaging, glass beer bottles and liquor bottles due to their light weight (about 1/10 of the same volume of glass bottles), non-fragile, stable light transmission and non-toxicity. There have been repeated injuries and it is not easy to recycle. Foreign countries have already turned to PET bottles, and the market prospects for pet bottles are very good.
Choosing Jilian Plastics, we produce China Pet Bottle with guaranteed quality and have a good reputation and influence in the international market. If you happen to have this demand, then we will be your choice not to be missed. If you are, please come and leave us a message.