PET bottle refers to a plastic bottle made of PET polyester through injection molding and blowing. PET bottles have strong applicability and are widely used in food packaging, daily chemical packaging, pharmaceutical packaging and other fields, such as cosmetic bottles, beverage bottles, mineral water bottles, medicine bottles, etc. The preform is the intermediate semi-finished product of the subsequent two-way stretch blow molding, and some of its factors affect the quality of the injection molding product.
1. Characteristics of PET packaging bottles
At a certain temperature and pressure, fill the mold with raw materials, and process it into a preform with a certain thickness and height corresponding to the mold under the processing of the injection molding machine. PET preforms are reprocessed by blow molding to form plastic bottles, such as cosmetic bottles, beverage bottles, mineral water bottles, etc. Methods.
2. PET packaging advantages
①It has good mechanical properties. The impact strength is 3~5 times that of other films, and the folding resistance is good;
② It has stable chemical properties. Oil resistance, fat resistance, vinyl acid resistance, dilute alkali resistance, resistance to most solvents;
③Excellent high and low temperature resistance. It can be used in the temperature range of 120°C for a long time, short-term use can withstand high temperature of 150°C, can withstand low temperature of -70°C, and has little effect on its mechanical properties at high and low temperatures;
④ has excellent barrier properties. Can block air, water, oil and odor;
⑤ Excellent transparency. It can block ultraviolet rays and has good gloss;
⑥ High security. Non-toxic, tasteless, hygienic and can be directly used for food packaging.
⑦The recycling rate is higher than other plastics. When burned as waste, it is flammable due to its low calorific value of combustion, and does not produce harmful gases.
In view of the above characteristics, PET bottles are widely used in container design, such as beverage packaging, condiments, daily chemical products, pharmaceutical packaging and other fields.
3. Main application fields of PET packaging bottles
01. Application in the field of food packaging
PET bottles, metal cans, paper-plastic composite packaging, and bottles are the four main packaging forms for beverage products at present. Among them, PET bottles have the advantages of stable structure, strong gas barrier, low water absorption, light weight, toughness, uniform thickness, good transparency and gloss, and occupy a major share of the beverage packaging market.
02. Application in the field of daily chemical packaging
At present, the packaging of cleaning products, personal care products, and even cosmetic products tends to be more transparent. PET bottles have excellent properties such as high strength, light weight, and good transparency. Using the high transparency of PET bottles can maximize the appearance and quality of the contents, and provide products with an excellent interface for "communication" with consumers.
03. Application in the field of pharmaceutical packaging
PET is not only a harmless resin, but also a pure resin without any additives. It has passed the inspection of quite strict food hygiene laws including the United States, Europe and Japan, and is considered to be a qualified and safe product. Packaging materials for medicines and food. Moreover, PET has excellent chemical resistance and can be used for packaging of all items except strong alkali and some organic solvents.
PET materials follow the "3R (reuse, reduce, recycle)" development trend of packaging products, and will be better recyclable and more environmentally friendly. The application field of PET new materials continues to expand, which will bring more innovative and friendly products to enterprises and users.
