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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 the substrate. This will enable appropriate adhesion between the two materials.
To achieve this, set the temperature of the hot melt tank to be hot enough to reduce the viscosity of the adhesive during application. This will help the adhesive flow correctly to bond the substrate before it cools down.
Coating thickness
The adhesive thickness refers to the amount of adhesive applied to the product. Although it varies depending on the application method, it always affects the cooling rate of the adhesive. Understand the required coating thickness to ensure the cooling rate of hot melt adhesive is achieved.
Pressurization
When two substrates are bonded together, they are subjected to compression or pressure. Be careful to apply appropriate compression to the substrate to achieve ideal adhesion without affecting its properties.
Opening hours
It is necessary to consider the opening time of the adhesive during the application process. The opening time of adhesive refers to the length of time required to achieve effective bonding.
The factors that affect opening hours include:
Temperature
Matrix
Glue application amount
Base material
The substrate being bonded together. Their quality and chemical composition directly affect adhesive bonding. For example, high textured substrates allow for more mechanical adhesion, while high surface energy substrates aid in wetting.
Understanding the substrate before using adhesive will help determine:
What type of adhesive should be used
How much glue should be applied
Although these five tips can help you understand what to consider when applying EVA hot melt adhesive, choosing the right method is still a challenge.
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