Abstract
For calendaring sheets with a desired final thickness, the design process of the calender unit includes, among other parameters, the calculation of the flow velocity and pressure fields in the gap between the rolls. In this paper, the fundamental aspects about the behavior of the molten polymer during the calendaring process are analyzed and the relations between the variables of interest are determined for calendring of high density polyethylene (HDPE), polyvinyl chloride (PVC) and ethylene styrene interpolymers (ESI). Keyword: plastic materials, calender, calendered sheet