Why is hot melt adhesive film not sticky?
2022-06-21
Customers often encounter this kind of confusion: the hot-melt adhesive film taken somewhere, when the sample is found to have poor bonding effect and is not firmly adhered, there will be hot-melt adhesive film that is not suitable for his products. idea. Whether the hot-melt adhesive film is really not suitable for his products, we can't make a conclusion for the time being, but we need to analyze why the hot-melt adhesive film is not sticky. Compared with the traditional water-based adhesives that we are familiar with, hot melt adhesive film has obvious advantages in environmental protection performance and bonding effect. Even so, many industries will still use water-based adhesives as adhesives for a long period of time. However, with the continuous deepening of the concept of environmental protection, it is imperative to switch to a more environmentally friendly hot melt adhesive! For customers who use hot melt adhesive film for the first time, price and bond firmness are two issues of concern. Selection error Selection error mainly refers to the wrong type of hot-melt adhesive film or hot-melt adhesive mesh film selected to be used, and it is difficult to meet the requirements of the material itself. It can be solved by replacing the corresponding model. The temperature during compounding does not meet the requirements The compounding temperature does not reach the melting point of the adhesive film or the omentum, resulting in insufficient melting of the hot melt adhesive and insufficient adhesive performance. In this case, it may be that the composite surface of the machine cannot reach the melting point of the film, or the heat permeability of the material is poor. If the machine temperature reaches the upper limit and still cannot be solved, a low temperature hot melt adhesive film test can be used. In addition, under the premise of ensuring that the material is not scalded, choose a surface layer with better heat permeability for pressure heating
