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Determine whether the material used to make the box is the same as before, and whether the surface has been treated, such as copperplate paper, with completely different properties from the original one. The performance differences of hot melt adhesives for the same purpose in the market are not significant. It will be difficult to find suitable hot melt adhesive for cardboard boxes, and passive selection may increase production costs. If the bonding effect of the cardboard packaging is really poor, it is recommended to adjust the surface treatment process of the cardboard box.
Secondly, whether the temperature has changed significantly from the previous time, the external temperature will affect the curing speed of the hot melt adhesive. When the weather is cold, the curing speed will be shortened, and if the line speed cannot keep up, it will not stick firmly. There are several solutions:
Firstly, it is to improve the speed of the production line, so that the glue can complete the sealing operation with better adhesive performance; Secondly, increase the usage temperature of hot melt adhesive by 5-10 degrees Celsius to prolong the cooling time; 3. Replace the hot melt adhesive with one that dries less quickly in cold weather.Moreover, whether the quality of the cardboard box hot melt adhesive is consistent with before and how much the quality of the raw materials fluctuates have an impact on the quality of the hot melt adhesive products. If the manufacturer does not control it well, it will have a significant impact on performance. This is a matter of choosing a long-term cooperative hot melt adhesive supplier. It is important to choose a Senlai hot melt adhesive manufacturer with research and development capabilities, rather than relying on a formula to constantly adjust the composition ratio. What happens in the application can fundamentally solve the problem.
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