A PVC emulsion heated to 200 ˚C passes through 3 gaps between rolls. Each gap reduces the thickness of the material. After the third gap, the PVC emulsion has been formed into a film. The film thickness will vary only slightly if the gap between the rolls undergoes only slight changes.

The low temperature process requires high rolling forces. The rolls and roll bearings must support these forces and allow a uniform film thickness to be achieved. Since the gap tolerances are only a few microns, the rolls must run true and must not undergo flexing.

• High rolling forces

• Precise roll runout

• No roll flexing

• Lubricant must still be sufficiently effective at temperatures of 200 ˚C