Solutions to the problem of easy damage to hot melt adhesive layers

The reason why the adhesive layer is prone to cracking is related to the force and physical properties of the hot melt adhesive. Ultimately, it is still necessary to rely on hot melt adhesive to find the corresponding solution.

Why does the magnitude of the force affect the fracture of the adhesive layer? Under normal circumstances, when the glue has seeped into the surface of the substrate to a certain extent during application. Meanwhile, the glue is constantly dissipating heat and drying out, eventually forming a layer of glue. The adhesive layer has a certain peel strength and toughness, and can withstand certain tensile and compressive forces, making the firmness of the bonded part very reassuring and not affected by external forces. However, sometimes 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 utilize the toughness of the substrate to enhance its own resistance. However, if the adhesive layer partially falls off upon pressure,

In addition, a softer hot melt adhesive is conducive to enhancing its ability to resist the risk of damaging the adhesive layer. The adhesive layer of the colloid soft spot hot melt adhesive also has certain resistance and toughness after application, just like a rubber band, and is not easy to break when stretched. Similarly, the consistency of this hot melt adhesive itself will be lower, making it easier to penetrate into the material and having sufficient permeability. The adhesive layer forms a certain dependence on the material, which also contributes to the firmness of the adhesive layer. When the adhesive layer is subjected to force, the soft adhesive layer can counteract part of the force and has good permeability, thus not partially detelling. The adhesive layer can still adhere well to the material surface.

Sometimes, multiple parts need to be bonded onto the same product. Some parts are relatively closed, while others are prone to force. At this point, it is necessary to consider whether the currently used hot melt adhesive can adapt to the bonding of all parts. Requirements. If you only want to use one type of hot melt adhesive to bond all the parts, you need to select the hot melt adhesive based on the bonding requirements of the parts that are difficult to bond, so as to avoid the situation where one part is bonded well while another has to be bonded well. There are phenomena such as cracking and bursting of the adhesive layer.