Pet Bottle Company

Custom Made Plastic Bottles, Custom Pet Bottles, Pet Bottles suppliers.
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2.1 Preform
The preparation of blow molded bottles, PET chips first injection molded preforms, it requires twice the proportion of recycled material is not too high (5%), the recovery can not be more than twice the number of times, but not too low molecular weight and viscosity (molecular weight 31000- 50,000, intrinsic viscosity 0.78-0.85cm3 / g). Injection molded preform should be stored for more than 48h before using. After heating did not run out of preforms must then be stored for more than 48h before being reheated to use. Preform storage time should not exceed six months.
Preform depends largely on the merits of the merits of PET materials should be selected easy to blow, easy stereotypes of material, and develop a reasonable preform molding process. Experimental results show that the viscosity of the same material molding PET preforms, imported raw materials than domestic Yi blow molding; and the same batch of preforms, production dates are different, the blow molding process may also be quite different. Preform the merits of the decision to ease the blow molding process, the requirements of the preform is pure, transparent, free of impurities, the same color, length and injection points around coronatines appropriate. 2.2 heating
Preform is heated by the heating oven to complete, the temperature is set manually, automatically adjusted. Emit far infrared oven heated by the far infrared radiation preform tube, the bottom of the oven fan heat circulation, so the oven temperature uniformity. Preform in the oven at the same time moves forward rotation, so preform wall heat evenly.
Lamps arranged in an oven from top to bottom general was "zone" shape, more than two and less in the middle. Heat the oven by opening the number of lamps, the overall temperature setting, and each section was heated oven power than joint control. The lamp is turned in conjunction with the pre-blowing to be adjusted.
To play a better role oven, adjust its height, the cooling plate, etc. is very important, if adjusted properly, prone to swelling during blow bottle (bottle large), a hard head and neck (neck material will not pull out), etc. defects.