Processing Machinery
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EVA Hot Melt Adhesive Weak Bonding
Problem Phenomenon
The bonded parts open and fall off.
Cause Analysis
Contamination of the adhered surface or low temperature causes poor wetting of the adhesive; exceeding the open time beyond the adhesive window also causes failure.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Clean the adhered surface; ②control the substrate temperature; ③complete the bonding within the open time; ④match the adhesive type with the substrate.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Bonding quality is a combination of surface state and process timing; open time management is often overlooked.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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