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Three Work Processes of Injection Stretch Blow Molding Machines
We can divide the work process of injection stretch blow molding machines roughly into three steps.
Firstly, process-direct heat conditioning system
The plastic raw material is fed into the injection stretch blow molding machine, and the material is then heated and melted in the barrel in the case of pet. Processing temperature for PET is happened at about 280 degrees Celsius. At this first station the molten material is injected under high pressure into the mold to make the preform. The perform is heat conditioned through direct contact with the wall of injection mold, to create a suitable heat profile which then maintained at a suitable temperature for easy processing at the next stretch blow station.
Secondly, process-molding
The preform is inserted into blow mold while it still has the correct heat distribution. The stretch rod stretches the perform vertically. Then compressed air is quickly blown into the perform to push it out to the blown mold walls, where it cools and hardens to form the bottle. Because of the perform with accurate temperature profiles are stretch blow molded. It is possible to mold high-precision specially shaped containers or containers with very thin walls.
Thirdly, the final station
The finished products are ejected from the machine. In contrast to other molding systems that use heaters to reheat and condition perform, that has previously been completely cooled direct heat con eliminates, the need for that reheating process by using the residual heat energy leftover from the injection molding process. This enables to mold bottles with the minimum heat energy requirements.
Firstly, process-direct heat conditioning system
The plastic raw material is fed into the injection stretch blow molding machine, and the material is then heated and melted in the barrel in the case of pet. Processing temperature for PET is happened at about 280 degrees Celsius. At this first station the molten material is injected under high pressure into the mold to make the preform. The perform is heat conditioned through direct contact with the wall of injection mold, to create a suitable heat profile which then maintained at a suitable temperature for easy processing at the next stretch blow station.
Secondly, process-molding
The preform is inserted into blow mold while it still has the correct heat distribution. The stretch rod stretches the perform vertically. Then compressed air is quickly blown into the perform to push it out to the blown mold walls, where it cools and hardens to form the bottle. Because of the perform with accurate temperature profiles are stretch blow molded. It is possible to mold high-precision specially shaped containers or containers with very thin walls.
Thirdly, the final station
The finished products are ejected from the machine. In contrast to other molding systems that use heaters to reheat and condition perform, that has previously been completely cooled direct heat con eliminates, the need for that reheating process by using the residual heat energy leftover from the injection molding process. This enables to mold bottles with the minimum heat energy requirements.
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