Because the product itself is solid, it is convenient for packaging, transportation and storage, without solvent, pollution and toxicity; And has the advantages of simple production process, high added value, high bonding strength and high speed.
Product selection
First, the color requirements of the glue should be different. If the 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.
Second, the surface treatment of the attached object. Hot melt adhesive is not as strict as other adhesives in surface treatment of the adherend, but the dust and oil stain on the adherend surface should also be properly treated, so that hot melt adhesive can play a better bonding role.
Third, the operating time. Fast operation is a major feature of hot melt adhesive. The working time of hot melt adhesive is generally around 15 seconds. With the wide application of modern production mode-assembly line, the working time of hot melt adhesive is required to be shorter and shorter. For example, the working time of hot melt adhesive in book binding and speaker manufacturing is about 5 seconds.
Fourth, temperature resistance. Hot melt adhesive is very sensitive to temperature. When the temperature reaches a certain level, the hot melt adhesive begins to soften, and when it is lower than a certain temperature, the hot melt adhesive will become brittle, so the temperature change of the environment in which the product is located must be fully considered when selecting the hot melt adhesive.
Fifth, stickiness. The viscosity of hot melt adhesive can be divided into early viscosity and late viscosity. Only when the early viscosity and the 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 guaranteed to have oxidation resistance, halogen resistance, acid and alkali resistance and plasticity. The viscosity of hot melt adhesive varies with the material of the object, and different hot melt adhesives should be selected according to different materials.