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Take you to understand the PET bottle blow molding process
Release time:
2024-02-01 13:22
The production of polyethylene terephthalate (PET) blow molded bottles can be divided into injection stretch blow molding (referred to as injection stretch blow molding) and extrusion stretch blow molding (referred to as extrusion stretch blow molding) according to the preform of the parison. . In these two molding methods, because the injection stretch blowing process is easy to control, the production efficiency is high, and the waste and defective products are less, so they are more versatile.
The production of polyethylene terephthalate (PET) blow molded bottles can be divided into injection stretch blow molding (abbreviated as injection blow molding) and extrusion stretch blow molding (called extrusion) according to different preforms. Out of blow molding). In these two molding methods, the injection blowing process is easy to control, the production efficiency is high, and the waste products are less and less.
PET blow-molded bottles can be divided into two categories, one is pressure bottles, such as bottles containing carbonated drinks; the other is non-pressure bottles, such as bottles filled with water, tea tea beverage bottles, and polyethylene naphthalate Modified PET bottle mixed with ester (PEN) or composite bottle of PET and thermoplastic polyarylate. It is classified as a hot bottle, which can heat up to 80°C or higher; a cold bottle does not require heat resistance. The hot bottle is similar to the cold bottle in the forming process.
The following mainly discusses the forming process of pressurized beverage bottles in cold bottles.
With the continuous advancement of technology and the expansion of production scale, PET blow molding machines are becoming more and more automated, and the production efficiency is getting higher and higher. The production capacity of the equipment continues to increase, from the previous production of thousands of bottles per hour to the current production of tens of thousands of bottles per hour. The operation has also evolved from the manual button type in the past to the current complete computer control, which greatly reduces the difficulty of process operation and increases the stability of the process.
At present, injection molding equipment manufacturers mainly include French SIDEL company and Germany KRONES company. Although the manufacturers are different, the equipment principle is similar, generally including the blank system heating system blowing system control system and auxiliary machinery five parts.
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