The function of off-type paper is to prevent contamination of preprepregs and to provide convenience for marking on its surface. Another function of off-type paper is to prevent transverse cracking of one-way preprepregs.
The off-type paper should be satisfied: it can stick to the preprepreg, but it is easy to separate the two; Do not react chemically with the resin system or pollute the resin system; When the temperature and humidity of the environment change, the length and width of the off-type paper should be kept unchanged, so as not to cause the off-type paper to wrinkle and make the prepreprepreg crumple; It shall have sufficient tightness to prevent moisture from entering the prepreleaching material through it; After traction, the elongation of the off-type paper should be consistent with that of the fiber to prevent deformation or distortion of the preprebearing material due to non-synchronization in the preparation process; Its thickness and unit area quality are not easily controlled accurately.
