Hot melt adhesive is a kind of plasticity EVA，APO ,Resin..etc adhesive, and its physical properties will change with temperature within a certain temperature range. In the process of using hot-melt adhesive, some customers will find that hot-melt adhesive will have wire drawing. Hot-melt adhesive wire drawing will not only affect the construction efficiency, but also affect the appearance of the product, and more likely affect the bonding effect. So how to solve the problem of hot melt adhesive wire drawing?
First of all, we need to understand the reasons why hot melt adhesive produces wire drawing, and solve the problem according to different reasons.
1.The temperature of the hot melt glue machine is low
The low temperature of the hot melt glue machine will increase the thinness of the glue and cause wire drawing. Therefore, when you encounter this situation, you can first consult the hot melt adhesive manufacturer’s glue construction temperature and increase the temperature setting appropriately.
2.The cohesion of the hot melt adhesive is too large
The cohesive force of the hot melt adhesive body is too large, and the colloid has a greater probability of resisting deformation during the construction process, and is less likely to be broken, resulting in obvious wire drawing. The smaller the cohesive force, the easier it is to break during the construction process, and it is not easy to produce flying wires; In the case that the product adhesion is satisfied, choosing a product with a smaller cohesive force will help reduce the occurrence of wire drawing, or increase the construction temperature of the product, improve the fluidity of the glue to reduce wire drawing
3.Rheological properties of melt
The glue is flowing at high temperature. This is mainly related to the selection and ratio of glue. The shorter the curing time of the glue, the easier it is to stop the flow of the glue, and it is less likely to produce wire drawing. Under the conditions of process permitting, choose the short curing time Glue is more conducive to reducing wire drawing.
4.Hot melt adhesive cohesion failure
Under the action of high temperature, the glue gradually appears cohesive failure, the macromolecular structure gradually decomposes into small molecules, the fluidity of the glue increases, and the curing time is prolonged. In this case, the glue tank needs to be cleaned, and the problem can be solved by replacing the new glue.
5.Solidification time of hot melt adhesive
The curing time of hot melt adhesive is very important to the occurrence of wire drawing. Generally speaking, hot melt adhesives with short curing time have a low probability of wire drawing, because the filaments formed when the hot melt adhesive is sprayed out of the muzzle are due to the rapid After curing, it cannot continue to be elongated, and it is prone to breakage, and sometimes there is no wire drawing out.
6.The influence of machine temperature
The temperature is too low to increase the thinness of the glue itself and cause the phenomenon of wire drawing.
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