1. Tube blank temperature and blow molding temperature: the temperature should not be too high, too high, low melt viscosity and easy to deform, resulting in uneven thickness of tube blank during transfer; When the temperature is too low, the products often have more internal stress, which is easy to deform and stress rupture in the process of use.
2. Injection blow molding resin: it has high relative molecular weight and melt viscosity, while the melt viscosity is less affected by shear rate and processing temperature. The product has good impact toughness and appropriate melt elongation.