EVA hot melt glue stick is a solvent-free, 100% water-free solid fusible polymer; It is solid at room temperature, and the hot melt glue stick is heated and melted to a certain temperature to become a liquid that can flow and has a certain viscosity. After melting, EVA hot melt glue sticks are light brown or white. EVA hot melt adhesive sticks are composed of basic resins, tackifiers, viscosity modifiers, and antioxidants. Choice of hot melt glue sticks:
First, the color requirements of hot melt glue sticks should be different. If there is no special requirement for the color of the substrate itself, it is recommended to use yellow hot melt sticks, generally speaking, yellow hot melt sticks are more sticky than white ones.
Second, the surface treatment of the substrate. The surface treatment of the hot melt glue stick on the substrate is not as strict as that of other adhesives, but the dust and oil stains on the surface of the substrate should also be properly treated to make the hot melt adhesive stick better play the adhesive effect.
3. Operation time. Fast work is a major feature of hot melt glue sticks. The operation time of the hot melt glue stick is generally about 15 seconds, with the wide application of modern production methods - assembly lines, the operation time requirements for the hot melt glue stick are getting shorter and shorter, such as book binding and speaker manufacturing The operation time of the hot melt glue stick is required to reach about 5 seconds.
Fourth, temperature resistance. Hot melt sticks are sensitive to temperature. When the temperature reaches a certain level, the hot melt glue stick begins to soften, and below a certain temperature, the hot melt glue stick will become brittle, so the selection of hot melt glue stick must fully consider the temperature change of the environment where the hot melt glue stick product is located.
Fifth, stickiness. The stickiness of hot melt glue sticks is divided into early stickiness and later stickiness. Only when the early and later sticks are consistent can the hot melt stick be stable with the substrate. In the production process of hot melt glue sticks, it should be guaranteed to have antioxidation, halogen, acid and alkali resistance and plasticity. The stickiness of the hot melt glue stick is different depending on the material of the substrate, so it is necessary to choose different hot melt sticks according to different materials.
