What are the requirements for the use of hot melt adhesive labeling machines?
We know that the bonding principle of the labeling machine is that the labeling machine melts the hot melt adhesive by heating, the melted adhesive becomes liquid, and then the hot melt glue tube and the hot melt glue gun of the hot melt adhesive labeling machine are sent to the The surface of the sticky substance is bonded after the hot melt adhesive cools down. The hot melt adhesive has strong adhesion, wide temperature range, heat resistance, cold resistance, acid resistance, alkali resistance, salt medium corrosion resistance, and good thermal stability. Therefore, the use of the labeling machine needs to choose the type of hot melt adhesive. Next, let’s take a look at the requirements and precautions for hot melt adhesives together with Guangzhou Yujunjun Packaging Equipment Co., Ltd.:
1. The color requirements of the glue should be different. If the adherend itself has no special requirements for color, it is recommended to use yellow hot melt adhesive. Generally speaking, yellow hot melt adhesives are better than white ones.
2. Surface treatment of adherends. The surface treatment of hot melt adhesive is not as strict as that of other adhesives, but the dust and oil stains on the surface of the adherend should also be properly treated to make the hot melt adhesive play a better role in bonding.
3. Operation time of labeling machine. Fast operation is the main feature of hot melt adhesives. The operating time of hot melt adhesive is usually about 15 seconds. With the widespread application of modern production methods-assembly lines, the operating time of hot melt adhesives is getting shorter and shorter, such as book binding and speaker manufacturing, which takes about 5 seconds.
4. Temperature resistance. Hot melt adhesives are sensitive to temperature. When the temperature reaches a certain level, the hot melt adhesive begins to soften. If it is lower than a certain temperature, the hot melt adhesive will become brittle. Therefore, the selection of hot melt adhesive needs to fully consider the temperature change of the environment where the product is located.
Five, stickiness. The viscosity of hot melt adhesive can be divided into early viscosity and late viscosity. Only the early viscosity is consistent with the late viscosity, the hot melt adhesive and the adherend can remain stable. In the production process of hot melt adhesive, it should be ensured that it has oxygen resistance, halogen resistance, acid and alkali resistance and plasticity. As the material of the adherend is different, the viscosity of the hot melt adhesive is also different. Therefore, different hot melt adhesives should be selected according to different materials.
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