Extrusion & Post
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PVB Extrusion Pressure Instability
Problem Phenomenon
PVB extrusion pressure fluctuates, film thickness and surface quality are inconsistent.
Cause Analysis
PVB extrusion needs to maintain consistent pressure; melt pump stability; screen blockage; temperature fluctuation affects viscosity and thus pressure; uneven feeding.; When troubleshooting on site, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
①Stable melt pump control; ②Regular screen replacement; ③Temperature stability management; ④Feeding uniformity guarantee.; After adjustment, continuously sample to verify the effect, confirm stability before resuming mass production
Key Takeaway
PVB pressure stability is the premise of thickness uniformity; melt pump and screen are key equipment; system stability management.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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