The migration of PVC sheet produced by blister machine

Migration occurs only in plasticized PVC articles and when dyes or organic pigments are used. The so-called migration is that some soluble dyes or organic pigments existing in the surrounding solvent penetrate into the surface of PVC products through plasticizers, and those dissolved dye (pigment) particles are also brought to the surface of the product, which leads to disintegration. Bleeding, solvent bleeding or blooming.