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PET is an abbreviation of Polyethylene Terephthalate, and its Chinese expression is (聚乙烯對苯二甲酸酯). Since 1976, it has been used for manufacturing drink bottles, i.e. PET bottles.
PET has an excellent hardness and tenacity, with light weight, air-proof, and non-volatilization capabilities. With an acid-alkali resistant appearance, the stability is better. Recently, PET has been widely used for carbonic acid drinks, tea, juice, water, rice wine, sauce, cosmetic and medicines in bottles.
The bottle embryo is made of Polyethylene Terephthalate (normally named PET), which is dried and is heated to a certain temperature and then is injected into a mould under a high temperature and high pressure in an injection moulding machine, and the material is then cooled in the mould cavity to cool the bottle embryo into a solid form. The bottle embryo is a pre-body of the drink bottles in the market used by consumers.
Besides a high plasticity, the stability of the material is also excellent.
The normal bottle top standards in the market are Obrist-3025 , PCO-1810, SNAPON-1816, ALCOA-1716 and ALCOA-1816, Among the above neck-finish standards PCO is often widely used, but recently it seems OBRIST-3025 is likely to displace it gradually.
The standard bottle embryo is transparent, and when the bottle top is heated to a certain temperature the chemistry configuration in the bottle top changes. This changing is normally called crystallization. After crystallization, the bottle top becomes white, and then the characteristic of material will also become different. The high temperature durability and hardness of bottle top can be largely enhanced, and this kind of bottle embryo is suitable for a drink filling under a high temperature, for example, tea (black tea and green tea).