Calendar (calender) is made up of two or more rolls, arranged according to a certain form, at a certain temperature, rubber or plastic has extended into a certain thickness and surface shapes of film, and fiber curtain of canvas or steel cord for hanging plastic machinery. Calendar according to the number of rollers can be divided into two, three rollers, four-and five-roll Calenders; according to the arrangement of rollers can be divided into "l" or "t" and "f", "z" type and the "s" type.