The use of PE protective film is very widespread, applied not only to smartphones but also in other applications. However, our understanding of this product is not very comprehensive, for instance, regarding the drying process of the adhesive in PE protective film, how does it affect the quality of the film?

The drying process of the adhesive for PE protective film refers to the process of solvent or moisture evaporation from the adhesive layer coated on the substrate, leading to the curing of the adhesive. As solvent or moisture evaporation always requires a certain amount of time, drying is a relatively slow step in the production of protective films. The drying speed not only determines the production speed but also significantly affects the quality of the product.

Once the adhesive of the PE protective film is applied, the solvent quickly evaporates before entering the drying oven. However, due to the heat absorption during evaporation, the surface temperature of the adhesive layer decreases, thereby slowing down the evaporation rate. Once the protective film enters the oven, the heat absorbed by the solvent's evaporation is supplemented by external heat传导. When the heat reaches equilibrium, the surface temperature of the adhesive layer and the evaporation rate of the solvent can be maintained constant.

Adhesives for protective film coatings exhibit viscosity and other rheological properties that influence the coating process. The greater the deviation of the adhesive's rheological performance from Newtonian fluids, the more likely it is to encounter quality issues during coating operations. Particularly when the adhesive behaves like a swelling body, its viscosity rapidly increases with the increase in coating speed. As a result, more mechanical force is required to spread the adhesive, making it challenging to achieve a uniform coating when the coating speed is fast.