PET Bottle Processing: <br />Heat and soften PET preform -- heater; <br />Blow high pressure air into preform and form bottle -- stretch blow molding machine, blow mold, air compressor, air purifier. <br />Stretching blow molding is also called biaxial orientation blow molding. It is a kind of package container producing method stretching preform in axes by mechanical device and in radial by compressed air ( air should be cleaned by air purifier if necessary) when material is under high elasticity condition. This is widely used for PET, PE, PVC and etc. <br /> <br />Orientation can improve product's mechanical property, solvent resistance, transparency and anti-permeability. Polymer molecule is unbalanced long-chain structure. Orientation happens when stretching. Orientation means molecule arrange along stretching direction parallelly. <br /> <br />Stretching blow molding brings biaxial orientation effect to the products. To cool products quickly means high orientation degree. <br /> <br />The glass transition temperature of PET is 820C, and its best orientation temperature is 1050C.
