Injection Molding
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PET injection machine selection
Problem Phenomenon
Using an ordinary '2079851475616104452 machine to process PET, the temperature control is unstable and product quality fluctuates greatly
Cause Analysis
PET has a high melting point and a short stability time after the melting point, requiring an injection system with many temperature control zones and little self-friction heat generation; when the shot weight is less than 2/3 of the machine's injection capacity, the melt is retained too long and degrades
Solution
①Select a PET-specific plasticizing system with many temperature control zones; ②the actual weight of the product including the runner is not less than 2/3 of the machine's injection capacity; ③calculate the clamping force at 6300 t/m² or above
Key Takeaway
PET has specific requirements for the '2079851475616104452 machine; the number of temperature control zones and the shot weight ratio are the two major verification items for equipment matching; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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