Injection Molding
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PEI Shot Size and Machine Matching
Problem Phenomenon
When small PEI products are produced on large machines, thermal degradation occurs frequently; the shot size ratio is improper and the melt residence time is too long.
Cause Analysis
PEI shot size should be 30~80% of machine capacity for best results; for high-temperature '2079851475616104452, to reduce thermal degradation, it is recommended that the minimum shot size be greater than 60% of machine capacity; too low a ratio multiplies the melt residence time.
Solution
①Match the machine according to product weight, with shot size accounting for 30~80% of capacity; ②for high-temperature processes, keep the shot size ratio >60% as much as possible; ③avoid oversized machines for small products; ④calculate the residence time.
Key Takeaway
PEI's 30~80% shot size window and 60% high-temperature lower limit are clear supplier guidance; machine matching is a prerequisite for degradation prevention and control; residence time needs quantitative calculation.
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