The solution to the easily broken hot melt adhesive layer
The reason why the adhesive layer is easy to break is related to the force and the physical properties of the hot melt adhesive. In the final analysis, it is necessary to use the hot melt adhesive to find the corresponding solution.
Why does the size of the force affect the fracture of the adhesive layer? Normally, the glue has penetrated into the surface of the substrate to a certain extent when gluing. At the same time, the glue is constantly dissipating heat and drying, and finally a layer of glue is formed. The glued layer has a certain peel strength and toughness, and can withstand a certain tension and pressure, so that the firmness of the glued part is very reassuring without being affected by external forces. However, there are times when certain products need to be tested under tension and pressure. If the adhesion between the adhesive layer and the surface of the substrate is good enough, the adhesive layer can use the toughness of the substrate to improve its own resistance. However, if the adhesive layer is partially detached as soon as it is stressed, it may break due to the resistance of the adhesive layer itself.
In addition, softer hot melt adhesives are beneficial to improve their resistance to the risk of breaking the adhesive layer. The glue layer of the colloidal soft spot hot melt adhesive also has a certain resistance and toughness after gluing, just like a rubber band, it is not easy to break when stretched. In the same way, the consistency of such hot melt adhesive itself will be lower, which is easier to penetrate into the material, and the penetration is sufficient. The adhesive layer forms a certain dependence on the material, which also helps the firmness of the adhesive layer. When the adhesive layer is stressed, the soft adhesive layer can offset some of the force, and with good penetration without partial detachment, the adhesive layer can still adhere to the surface of the material well.
Sometimes it is necessary to glue multiple parts on the same product, some parts are relatively closed, and some parts are easily stressed. At this time, it is necessary to consider whether the hot melt adhesive currently used can adapt to the bonding of all parts. Require. If you only want to use one hot melt adhesive to complete the bonding of all parts, you need to choose the hot melt adhesive according to the adhesive requirements of the parts that are difficult to bond, so as to avoid causing one part to stick well and the other to stick well. There are phenomena such as cracking and popping of the adhesive layer.
