Different varieties of plastic packaging PE films have different properties. When selecting, we need to consider the following according to some basic functions of plastic packaging films, mainly the protection function of commodities, promotion function, adaptability to packaging machinery and other special needs of applications:

1： It is difficult to recognize this point with the naked eye. It is better to use optical instruments for measurement. Another simpler method is to select a small piece of each protective film and paste it one by one in the middle of the computer desktop, and then create a blank word file on the computer, Check the whiteness of the blank word file in the areas with and without film or different film areas on the computer (professionally called brightness). The bright material can be selected by comparison, and its excessive permeability is a better protective film.

2： In a slightly dark room, open a fluorescent lamp, tear off the protective film, remove the upper and lower release film, hold it by hand and put it between the eyes and the light. You can carefully see whether there is a layer of foggy things evenly distributed in the protective film, that is, the culprit affecting the haze. The more serious this foggy thing is, the greater the haze is, the worse the material is, otherwise, the better; (note that haze will affect transmittance, but it is different from transmittance!)

3： Scrape with a little hard metal device or newly cut nail on the PE protective film surface with the strength of the usual stylus. The simple method is to scrape with a slightly hard metal device or newly cut nail on the material use surface with the strength of the usual stylus. If it is very easy to scratch, it is determined that it is not scratch resistant, and if there is no scratch, it can be determined that it has scratch resistant function.