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The curing speed of EVA hot melt adhesive refers to the time from the beginning of adhesive bonding to the moment when the bonding strength reaches 80%. The curing time required for general use ranges from 1 second to 10 seconds, and the curing speed required for automatic sealing is generally within 4 seconds. There are many factors that affect the curing speed of hot melt adhesive.
Firstly, the type of EVA has little effect on the curing speed, but the trend is that EVA hot melt adhesives with low melt index and EVA content correspond to faster curing speed.
The second is the role of thickening agents. Choosing a viscosity enhancer with a high softening point and increasing its dosage can help improve the curing speed. The use of tackifiers has a significant impact on the curing speed.
Finally, wax has an impact on the curing speed. Wax usually plays a role in viscosity regulation and partial plasticization in EVA hot melt adhesive systems. Wax has the greatest impact on curing speed.
The general rule is that the higher the softening point of wax, the faster the curing speed. The more wax is used, the faster it solidifies. However, wax has a significant adverse effect on adhesive strength, so the adjustment of curing speed is limited to relying solely on wax.
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For most terminal packaging operations, adhesive carbonization is usually the main cause of most downtime events. Once EVA hot melt adhesive carbonization occurs, it will be difficult to clean thoroughly without taking extreme measures. Even after flushing, charcoal may still stick to narrow corners and continue to cause issues that affect normal operating time and […]
