The residual adhesive treatment method of PE protective film.
1. Human factors: Some people think that PE protective film looks like just a layer of plastic film. Any type of protective film can meet their product needs, and even just feel like it can be applied well. This is a very perfunctory view. There are also many professional knowledge about PE protective film, such as maintaining the cleanliness level of equipment before glass film There should be no vegetable oils or organic chemical residues on the surface of the product, otherwise it is easy for the residues to react with the strong adhesive, leading to adhesive failure The problem of insufficient viscosity, etc .
2. The internal elements of strong adhesive can be divided into the following three points: ① The adhesive base is damaged, and there are many adhesive residues on the surface of the maintained product, which can be seen from the surface of the PE protective film. ② The cohesive force is damaged, and there is pressure-sensitive adhesive on the surface and material of the maintained product, and the adhesive surface of the protective film is dull. ③ Transfer residues, there is a small amount of pressure-sensitive adhesive residue on the surface of the maintained product, and the glossiness of the adhesive surface of the PE protective film remains stable.
3. Aging principle: The carbon chain of acrylic resin pressure-sensitive adhesive is a saturated state chain, and general heat is difficult to break down the main chain. The aging principle is mainly UV aging, and the aging of the sheet is also mainly UV aging. For example, the tensile strength of PE plastic film sheet after aging under 30W UV light from a UV lamp supplier in a natural environment at 80 ℃ for one week shows that the general application temperature has little direct effect on its aging characteristics, while the harm of UV light is relatively large. However, under the dual effects of heat and UV light, there is a synergistic aging effect.
The adhesion between the PE protective film and the protected product is not firm, and there is a phenomenon of detachment during transportation and use. The reason for this problem is exactly opposite to the previous problem. The most likely reason is that the pressure-sensitive adhesive used in the production of the protective film product is not sticky enough. Another possibility is that the pressure of the molding machine used by the user during the molding process is not enough, or the surface of the profile is not clean enough, with dust or paint, which affects the bonding effect of the pressure-sensitive adhesive. If this problem occurs, targeted measures should be taken to address the cause, replace the pressure-sensitive adhesive to increase the film pressure, or pay attention to effectively cleaning the surface of the profile during the molding process to avoid such problems.
After using the protective film for a period of time, it performs well in the middle, but the wings rise at both ends. The main reason for this phenomenon is that the protective film has a high degree of stretching during the bonding process with the protected profile. After bonding, it encounters high temperature environments and unnecessary shrinkage occurs. This problem often occurs in products of southern customers. Therefore, PE protective film should pay attention to the impact of environmental temperature differences on product use during production, and avoid unnecessary surface stretching during the bonding process.