What is pvc film calendering method?

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The calendering method adds the plasticized melt in the internal mixer or extruder into the calendering machine, adjusts the gap between the rollers and the speed ratio of adjacent rollers, and passes through 2- The four rollers are calendered to make them gradually thinner, and finally a flat sheet film with the required thickness is obtained. The advantage of calendering method is that the thickness precision of the film is high, which is better than extrusion blow molding method and T-head method; The disadvantage is that the width of the film is limited. Calendering method is commonly used in PVC film processing, and sometimes also used in PE, PP, PS and PET processing.