Extrusion & Post
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PVB Resin Molecular Weight Selection
Problem Phenomenon
PVB film mechanical properties and processability conflict, molecular weight selection improper.
Cause Analysis
Small molecular weight is favorable for processing and preparation but mechanical properties are poor; large molecular weight is unfavorable for processing, melt extrusion consumes more energy; larger high-temperature modulus easily causes bubbles and other defects during lamination; appropriate molecular weight provides better mechanical properties.
Solution
①Select appropriate molecular weight PVB resin according to application; ②Balance processability and mechanical properties; ③High-temperature modulus assessment; ④Supplier technical collaboration.; After adjustment, continuously sample to verify the effect, confirm stability before resuming mass production
Key Takeaway
PVB molecular weight selection is a trade-off between performance and processing; high-temperature modulus affects lamination quality; supplier collaboration optimizes selection.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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