Material Analysis
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PVC Plate-out
Problem Phenomenon
White/yellow exudates gradually accumulate on the surfaces of die, calibrating die, and embossing rollers; scratches and defects appear on product surface, requiring frequent shutdown for cleaning.
Cause Analysis
Lubricants and stabilizer components in the formula have poor compatibility with PVC, migrate and exude during processing and deposit on metal surfaces; excessive external lubrication is a common inducement; exuded low-molecular substances accumulate on the die surface and periodically transfer to products forming defects.
Solution
①Optimize the lubrication system, reduce exudation of incompatible external lubricants; ②Change the stabilizer variety; ③Regularly clean the die and calibrating die; ④Evaluate filler and additive compatibility; ⑤Reduce processing temperature to reduce migration.
Key Takeaway
PVC plate-out = a 'formula compatibility' problem: process can only alleviate, formula is the root; if lubrication balance is not done well, the die surface keeps 'spitting scale', and cleaning the die until hands are sore cannot cure the root.
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