Where conventional calender technology reaches its limits the Roller Head extends the technical production possibilities. Compared to the classical calender unit, where to avoid air inclusions the thickness is only limited to approx. 3 mm in a single pass, Roller Head technology can produce sheets up to approx. 25 mm. The Roller Head die is fed with compound that has been well plasticized by the extruder. It is then fed, across the entire working width of the calender directly into the roll gap. This avoids the usual "rolling bank" of compound and therefore the possibility of air inclusion.

According to the final product the Roller Head die pre-forms the compound to a sheet thickness between 10 and 40 mm. The calender draws the sheet down to the required final thickness. The thickness tolerances of sheets produced on a Roller Head are extremely accurate. Compound homogenity is also excellent.