Extrusion & Post
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EVA Hot Melt Adhesive Unstable Viscosity
Problem Phenomenon
The viscosity of the hot melt adhesive fluctuates during application, and the coating is uneven.
Cause Analysis
Heating temperature fluctuations directly change the viscosity of EVA hot melt adhesive; long-term heating and oxidation of the adhesive in the glue tank also changes the rheological properties.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Stabilize the glue tank temperature; ②control the heating residence time of the adhesive; ③regularly clean the glue tank; ④set the temperature according to the process card.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Hot melt adhesive application quality is guaranteed by temperature stability; oxidation management extends the service life of the adhesive.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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