segment the PET bottle is cooled to 34~38℃, then labelling PET bottles, packing and finishing and packaging. It can be seen that hot-fill process PET bottle heat resistant performance is better, can overcome the influence of temperature on the shape of the bottle. For generic products, high temperature (85~90℃) PET bottle volume shrinkage should be controlled in 1%~1.5%. 2. the barrier
Although PET gas barrier than polyethylene, polypropylene, polystyrene and other plastics, but for beer, liquor, perfume and other preservation, baoxiang's more demanding still does not fully meet the requirements for the product. Many research institutions, companies and universities have been working on how to improve PET bottles for O2, CO2, H2O and gas barrier properties, has achieved certain results. To improve PET bottles barrier there are 3 main methods: is a multi-layer composite, dominated by PET, add PVDC, EVOH, PEN or other tightness material into 3 or 5 bottles; Secondly, using special methods, such as PET bottles or coat epoxy barrier coating, or plasma processing (ACTIS). Domestically some plasma vapor deposition technology for laboratory to try to improve gas barrier properties of PET films; the third is with other barrier resin molding, taking PEN, PEN and PET copolymer blends or as raw materials, which can improve the bottle's barrier and improving the heat resistance of the bottle. 3. to develop in the direction of thinner, lighter
With the maturing of modification of PET, PET bottles are bound to develop in the direction of thinner, lighter, and this helps to reduce the waste of resources to sustainable development is of great significance. The Coca-Cola Company announced on June 28, 2007, in the United Kingdom market lightweight 500ml capacity PET bottles. The PET bottle weight is 24G, instead of 26G bottles. First 24gPET bottle production in September 2007 and Assembly, to begin production in 2008, an annual production capacity of 350 million 24G 500ml PET bottle, total savings of about 700 tons of polyester.
Prospects currently, PET bottles have been widely used in the packaging of goods, especially in carbonated beverage packaging, its demand for 40% per cent of total demand for PET bottles. With the improvement of people's quality of life, for a variety of beverages, fruit juice and will further increase the demand, it will also expand the demand for PET bottles. More importantly, used PET bottles of domestic beer is quite small, with the improvement of PET bottle performance, production and processing technology of continuous improvement, cost of production decreases, more beer manufacturers will accelerate the pace of used PET bottles of beer, beer package demand the fastest-growing segment of the PET bottle. So, PET bottles will have bright prospects.