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一、 Application of pet milk tea cup in beverage packaging
Coca Cola in the United States started to use pet milk tea cups to package cool drinks. They replaced 1L glass bottles with 1.5L polyester bottles, which increased retail sales by 27percent. Subsequently, PET container packaging of drinks all the way up.

The advantages of PET container, such as light quality, strong endurance, good applicability and high dye content, make it popular in beverage packaging. At present, China is in the high-speed development trend of PET beverage packaging. The demand of PET bottles for packaging increases by double-digit every year. In recent years, China's tea beverage sales market has risen rapidly, because tea drinks are required to carry out hot filling under the standard of 85 ℃～ 90 ℃, and the high temperature resistance of pet milk tea cup for hot canning can reach up to 95 ℃. Therefore, the hot filling pet milk tea cup for tea drinks has become a kind of pet milk tea cup with a growth rate of more than 50percent.

二、 Pet milk tea cup as beverage packaging has advantages over PP bottle
1. The penetration rate of pet to oxygen and carbon dioxide is 30 times less than that of PP, and the vapor barrier and bending property are weak, which limits the application of PP bottles. At present, the key technologies are auxiliary materials, food raw materials, edible spices and other cooked products
Food packaging, rather than replacing pet as the mainstream packaging of carbonated drinks.
2. The thermal conductivity of pet milk tea cup is higher than that of PP, and the heating or water cooling time in the production process is 25percent shorter than that of PP.
3. Under the indoor temperature standard, the impact property of PP water cooling is worse than that of pet.
4. In pure condition, PP is not as transparent as pet, so it is necessary to add transparent preservative or nucleating agent to make its compatibility similar to pet. Transparent agents are generally organic substances soluble in thermosetting plastics, while nucleating agents are usually composed of talc, carboxylate or phosphate. The sorbitol transparent agent released in the 1970s of the 19th century is still widely used. This kind of transparent agent has some disadvantages, such as the lack of compatibility under the condition of polyester non-woven fabric, the high temperature can not slice layer, and the pungent taste, which limits the application of PP bottle in beverage packaging.
3、 Defects of pet milk tea cup
PET packaging is very easy to lead to vapor infiltration, oxygen penetration and carbon dioxide outflow when packaging beer and other aerated drinks, which will harm the flavor and taste of drinks; the chemical properties of polyester are active, so it is very likely to absorb some flavor substances in beer, leading to the change of beer taste; pet milk tea cup cleaning, canning and transportation are very easy to suffer At present, pet milk tea cup does not completely deal with the problem of heat sterilization, so its application scope is limited.
As the main force of beverage packaging materials in China, PET packaging usage has maintained a rising trend so far, so its influence will not be changed easily.