What structures does release paper have?

Release paper is a kind of anti - sticking paper that prevents prepregs from sticking together and protects prepregs from contamination. Release paper is made of paper coated with anti - sticking substances, and its types are distinguished according to differences in materials, thickness, elongation, and single - or double - sided nature. The structure of release paper: Anti - sticking paper, also known as silicone paper. It consists of a three - layer structure. The first layer is the base paper; the second layer is the lamination; the third layer is the silicone oil. It can be used in electronics, automotive foams, printing, food, medical applications, etc. In most cases, it is used together with sticky materials, especially adhesive tapes. When producing prepregs by the wet method, release paper is placed on both the top and bottom of the prepreg. The lower release paper is attached to the prepreg as it is wound up. Therefore, there is usually a layer of release paper protecting the surface of the prepreg. The functions of release paper are to prevent the prepreg from being contaminated and to facilitate marking on its surface. Another function of release paper is to prevent the transverse cracking of unidirectional prepregs. Release paper should meet the following requirements: It can adhere to the prepreg, but the two can be easily separated; It does not react chemically with the resin system or contaminate the resin system; When the ambient temperature and humidity change, the length and width of the release paper should remain unchanged to avoid wrinkling of the release paper, which could cause the prepreg to wrinkle; It should have sufficient density to prevent moisture from entering the prepreg through it; After being stretched, the elongation of the release paper should be consistent with that of the fibers to prevent the prepreg from deforming or twisting due to asynchronous stretching during the preparation process; Its thickness and mass per unit area are not easy to control precisely.