Processing Machinery
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Cross Reaction Between PSU and POM/PA
Problem Phenomenon
When switching materials for PSU production, POM, PA and other residues remain in the barrel, causing severe degradation and abnormalities, damaging both equipment and products.
Cause Analysis
When processing PPSU-type materials, if POM, PA and other material residues remain in the barrel, there is a risk of cross-linking reaction; chemical reactions between materials accelerate decomposition; the residual amount is small but the harm is great.
Solution
①Thoroughly clean the barrel before material changeover and confirm no residue; ②Establish a material changeover taboo table; ③Purge with a sufficient amount of cleaning material; ④Strengthen inspection of the first batch after changeover.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The cross-linking risk between PSU-type materials and POM/PA is a clear industry warning; changeover cleaning cannot be a mere formality; taboo table management prevents human negligence.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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