PET Bottle Processing:
Heat and soften PET preform -- heater;
Blow high pressure air into preform and form bottle -- stretch blow molding machine, blow mold, air compressor, air purifier.
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.
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.
Stretching blow molding brings biaxial orientation effect to the products. To cool products quickly means high orientation degree.
The glass transition temperature of PET is 820C, and its best orientation temperature is 1050C.