Pet Bottle Blow Molding Process

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Polyethylene terephthalate (PET) bottle blow molding parison of pre-production press forming can be divided into injection stretch blow molding (injection stretch blow for short), and extrusion stretch blow molding (extrusion stretch blow for short) . In both molding methods, because injection stretch blow technology is easy to control, high efficiency, less waste and more common defects.



    PET bottle blow molding can be divided into two categories, there is a pressure bottle, such as filling carbonated beverage bottles; another for the non-pressure bottles, such as filling water, tea, oil bottles. Blended tea drinks bottles is polyethylene naphthalate the ester (PEN) modified PET bottles or PET and thermoplastic composite bottle aryl ester, the classification is a hot bottle, can heat above 80 ; bottle belong cold bottle, no requirement for heat tolerance. In the molding process on the hot and cold bottle similar to the bottle. The author focuses on cold drink bottle bottle with pressure molding process. zippered checkbook cover

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    1, device: As technology advances and production scale, PET bottle blowing machine high degree of automation, increasing production efficiency is higher. Equipment production capacity rising production from the previous several thousand bottles per hour developed to produce tens of thousands of bottles per hour. Also from the previous manual operation button style development for now all computer-controlled, greatly reduced the difficulty of process operation, increasing the stability of process.



    At present, the injection stretch blow equipment manufacturers primarily in France SIDEL, Germany's KRONES Company. Although different manufacturers, but the principle of similar devices, which typically includes for the blank system, heating system, blowing system, control system and auxiliary five parts. 2 PET bottle blow molding blow molding process. PET bottle blow molding process affecting the important factors that preform, heating, pre-blowing, mold, and the environment.



    2.1, preform: Preparation blow bottle, the first slice PET preform injection molding as it requires twice the proportion of recycled material can not be too high (5%), recovery times can not be more than twice, and the molecular weight and viscosity can not low (31000-50000 molecular weight, intrinsic viscosity 0.78-0.85cm3 / g). Injection molding of preforms can only be stored for more than 48h to use. Do not run out of preform heating, have to store more than 48h before being re-heated use. Preform of the storage time should not exceed six months. PET preform depends largely on the merits of the material advantages and disadvantages, should be selected easily Inflation, easy to shape the material and make reasonable preform molding process. Experimental results show that the same viscosity of PET preform molding materials, imported raw materials than domestic trade blow molding; the same batch of preforms, production of different dates, blow molding may also be quite different. Preform determines the merits of the ease of blow molding process, the requirements of the preform is pure, transparent, no impurities, no different color halo around the injection point and the length of the right spot.



    2.2, Heating: preform heating by the heating oven to complete, the temperature set by the manual and automatic adjustment. Infrared lamp oven issued by the far infrared radiation heating of the preform from the bottom of the fan for heat circulation oven to oven temperature uniformity. Preform in the oven while forward movement of rotation, so that preform wall heat evenly. Lamp in the oven in the top-down arrangement of the general was "District" shape, more than two, the middle less. Heat oven to open by the number of lamps, the overall temperature setting, oven heating power and the ratio of the common control section. Lamp combined with pre-blowing opening to be adjusted.