Paper compression calendering

Polyvinyl Chloride. (Table 15.5) this is the most versatile of the commercial thermoplastic polymers. It is used mainly for rigid and flexible plastics, for rubberlike products, for coatings on steel, cloth, and paper, and in smaller amounts for specialty fibers. It is processed mainly by extrusion and calendering, and in smaller amounts by injection, compression, and... 

The soft elastic roll presses the paper web against the heated roU. This cover must exhibit a certain local deformation ability in order to at least partly follow the microscale topography of the paper web in the calender nip. The compression modulus of the cover is of similar magnitude to that of the paper. The local deformation of the cover ensures that the paper is not just calibrated in the nip, but that the thirmer areas of the web are calendered as weU. Thus soft nip calendering results in better printability compared to hard nips for most printing processes. 

Calender bowl paper is strong, compressible, heat-resistant paper used for the manufacture of calender bowls. 

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