Processing Machinery
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Cross Reaction Between PSU and POM/PA
Problembeschreibung
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.
Ursachenanalyse
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.
Lösung
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
Wichtigste Erkenntnis
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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