PE protective film in industry is made of acrylic acid PSA coating (Silica gel is mainly used in PET protective film). The adhesion of protective film is determined by the proportion of original gum and the amount of glue. In the process of application,though, PSA protective film has problem of high adhesion because of the high stickiness of itself.It's directly related to covering and the storage of pressure and temperature. As is known to all, PSA glue is only sensitive to stress. You can adjust the pressure stored when or after the covering. If the protective film itself has high adhesion, you can try to use it when it cool down (Using at temperature below 20℃, you will clearly feel the adhesion comparatively decreased).
If the adhesion is too low, it may be difficult to tear the film down from the coated product. If the adhesion is too high, then it may be easy to fall off.
Recently, the adhesion of PE protective film is determined by the thickness of slica gel. Not long ago, when making protective film for the screen of VDOO mobile phone, the company had the same problem. High adhesion means high thickness. When the whether is hot,the slica gel will expand when heated and contract when cooled making it look like the screen is sweating,which is call overflow for short in jargon. Therefore, make sure the adhesion is not too high, otherwise it will be difficult to tear the film down.
The VDOO company did many experiments when designed the film and finally found the appropriate data of thickness. Besides, taking the thickness into consideration, the purposes of flatness, high resisitance to scratches and high clarity also achieved.
