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The characteristics of EVA hot melt adhesive: Hot melt adhesive is a solid, fusible polymer that does not require solvents and contains no 100% moisture. It is solid at room temperature and turns into fluid and viscous liquid when heated to a certain temperature. Melted EVA hot melt adhesive is light brown or white.
EVA hot melt adhesive is composed of base resin, tackifier, viscosity regulator and antioxidant.
1. The color of the glue.
If there are no special requirements for the color of the base material itself, it is recommended to use yellow EVA hot melt adhesive. Generally speaking, yellow EVA hot melt adhesive is more viscous than white one.
2 Surface treatment of the substrate.
The surface treatment of EVA hot melt adhesive is not as strict as that of other adhesives, but the dust and oil stains on the substrate surface also need to be properly treated to enable the EVA hot melt adhesive to better exert its bonding effect.
3 Operation time.
Rapid operation is a major feature of EVA hot melt adhesive. The working time of EVA hot melt adhesive is generally around 15 seconds. With the wide application of modern production methods – assembly lines, the working time requirements for EVA hot melt adhesives are getting shorter and shorter, such as in book binding, speaker manufacturing, etc. The operation time needs to reach about 5 seconds.
4. Temperature resistance.
EVA hot melt adhesive is relatively sensitive to temperature. When the temperature reaches a certain level, EVA hot melt adhesive begins to soften. Below a certain temperature, EVA hot melt adhesive will become brittle. The selection of EVA hot melt adhesive must fully take into account the temperature changes in the environment where the product is located.
5 Viscosity.
The viscosity of EVA hot melt adhesive is divided into early viscosity and late viscosity. Only when the early viscosity is consistent with the later viscosity can the EVA hot melt adhesive and the substrate remain stable. In the production process of EVA hot melt adhesive, it is necessary to ensure that it has oxidation resistance, halogen resistance, acid and alkali resistance, and plasticity. The viscosity of EVA hot melt adhesive varies depending on the material to be bonded. Different EVA hot melt adhesives should be selected according to different materials.
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