Extrusion & Post
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Uneven Density of PS Foam Board
Problem Phenomenon
Large lateral deviation in XPS board density.
Cause Analysis
Uneven dispersion of the blowing agent or improper temperature control causes inconsistent expansion ratios; extrusion fluctuations also affect density.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solution
①Optimize blowing agent dispersion; ②Stabilize temperature control; ③Stabilize extrusion output; ④Online density detection.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The density uniformity of foam board relies on the dual stability of formulation and process.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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