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Hollow blow molding machine / blow molding process What are the influencing factors?
- Feb 06, 2018 -

Blowing pressure

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PP blow molding machine has two roles of compressed air, inflation and cooling. Low viscosity, small volume or thick-walled parts should adopt low pressure; high viscosity, large volume or thin-walled parts should adopt higher pressure.

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Blowing speed

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In order to shorten the blowing time, in order to facilitate products to obtain a more uniform thickness and better surface, the inflation rate should be as large as possible, but the speed is too fast prone to the following phenomena: ① in the air inlet to create a vacuum so that this part of the parison When the parison is fully inflated, the invagination part will form a diaphragm; ② The parison in the die part may be pulled off by the extremely fast air flow.

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3 blow up ratio

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Usually controlled at 2-4 times, the blow-up ratio is too large, the product shape stability is poor, too small can easily lead to uneven wall thickness.