What are the characteristics of extrusion, stretch and blow molding?
Extruding, stretching and blowing are mainly as follows.
(1) for transparent non-crystalline plastics, after bidirectional stretching, the transparency and luster of the plastic bottle are improved.
(2) the plastic bottle has better stiffness, which can reduce the quality of the bottle (save consumable materials) or improve the bottle's stacking strength
(3) improve the barrier of plastic bottles.
(4) it can improve the impact strength of plastic bottles at low temperature or save the impact modifier (when the bottle is at or above room temperature, the impact strength is not significantly improved).
(5) production capacity can be improved.
(6) two sets of molds are required for bidirectional stretch blow molding (pre-blow and stretch blow molding).