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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.
What issues should be considered when using EVA hot melt adhesive? Although there are various types of hot melt adhesives, there are five key factors that can affect their performance. Consider these items before applying hot melt adhesive to ensure ideal performance: Temperature When using EVA hot melt adhesive, ensure that it can fully wet […]
Under standardized storage, the shelf life of EVA hot melt adhesive granules is usually 12-24 months; Polyolefin and other systems can last longer. But ‘shelf life’ does not mean ‘just leave it at will’, the environment determines the actual usable time. Key factors affecting shelf life Reference for shelf life of different systems system Reference […]
EVA hot melt adhesive is currently one of the widely used industrial adhesives. They are essentially thermoplastic based on polymers, which means they are solid at room temperature but liquefy when exposed to a heat source. In this article, you will learn more about hot melt adhesive: EVA hot melt adhesive. What issues should be […]
After being glued, if it doesn’t dry or opens easily after flipping, it is often due to poor coordination of paper moisture, glue temperature, and glue amount. Checking according to three criteria is more accurate than directly changing the glue.
