How does hot melt glue stick firmly?
1. In order to bond firmly, the first problem to be solved is to ensure the correctness of hot melt adhesive selection. There are many types of hot melt adhesives, including rubber granules, rubber blocks, rubber powder, plastic films, omentum films, etc. There are also types of adhesive films with or without substrates. According to the composite process requirements of the product, a relatively suitable type of hot melt adhesive can be selected.
2. Stickiness. The viscosity of hot melt adhesive is divided into early viscosity and late viscosity. Only when the early viscosity and late viscosity are consistent, can the hot melt adhesive and the adherend remain stable. In the production process of hot melt adhesive, it should be ensured that it has oxidation resistance, halogen resistance, acid and alkali resistance and plasticity. The viscosity of the hot melt adhesive is different depending on the material of the attached object. Therefore, different hot melt adhesives should be selected according to different materials, and the selected hot melt adhesive material should be compatible with composite materials, such as: metal The material has better compatibility with the hot melt adhesive of pes material, and poor compatibility with the hot melt adhesive of other materials.
3. The color requirements of the glue should be different. If the attached object itself has no special requirements for color, it is recommended to use yellow hot melt adhesive. Generally speaking, yellow hot melt adhesive is more viscous than white.
4. Surface treatment of the adhered object. The surface treatment of the hot melt adhesive is not as strict as other adhesives, but the dust and oil on the surface of the adhered should also be properly treated, so that the hot melt adhesive can play a better role in bonding.
5. Working time. Fast operation is a major feature of hot melt adhesives. The working time of hot melt adhesive is generally about 15 seconds. With the wide application of modern production methods – assembly line, the working time of hot melt adhesive is getting shorter and shorter, such as book binding and speaker manufacturing. It takes about 5 seconds.
6. Anti-temperature. Hot melt adhesives are more sensitive to temperature. When the temperature reaches a certain level, the hot melt adhesive begins to soften. Below a certain temperature, the hot melt adhesive will become brittle. Therefore, the choice of hot melt adhesive must fully consider the temperature change of the environment where the product is located.
WinLong is a hot melt glue manufacturer, if you would like to learn more, please contact the adhesive experts at internetwoodglue.com. We have served customers in dozens of industries and can meet all your adhesive needs
