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- 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 homogeneity is also excellent.
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