Soft nip calender employing a continuous elastic belt
AssigneeMetso Paper, Inc.
InventorMagnus Wikstrom
Life of this patent
Estimating the term…
Abstract
A calender having a heated first roll which is opposed to and forms a nip with a soft surface counter roll system comprised of a second roll which has an outer shell. An endless polyurethane belt or blanket having an inside diameter 5 to 50 mm larger than the outside diameter of the second roll shell, is mounted about the second roll. The outer circumferential edges of the polyurethane belt are held by clamping rings to bearings which are circumferentially mounted about the second roll on the roller gables. A small quantity of oil may be placed between the surface of the second roll shell and the polyurethane belt.
Claims10
A soft nip calender for calendering a web comprising:
- a calender frame;
- a first heated calender roll mounted for rotation to the frame, the roll having a first cylindrical shell defining a web contacting surface, the surface being hard and smooth;
- a second calender roll, the roll having a second cylindrical shell having a first selected exterior diameter, the second cylindrical roll being mounted for rotation to the calender frame in spaced parallel relation with the first heated calender roll, the second calender roll defining roll gables at opposed ends of the second calender roll;
- and
- an endless polymer mantle belt mounted coaxially with a second calender roll, the mantle belt defining an interior diameter, the interior diameter of the mantle belt being 5-50 mm larger than the first selected diameter.
A soft nip calender for calendering a web comprising:
- a calender frame;
- a first heated calender roll mounted for rotation to the frame, the roll having a first cylindrical shell defining a web contacting surface;
- a second calender roll mounted for rotation to the calender frame in spaced parallel relation with the first heated calender roll, the second calender roll having a second cylindrical shell extending between a first bearing and a second bearing;
- and
- a looped polymer belt mounted coaxially with the second calender roll, the belt being clamped at a first end to the first bearing, and at a second end to the second bearing, such that the web travels over the looped belt at a nip formed between the first roll and the second roll, the belt being rotatable with respect to the second roll.
Dependencies are inferred from the claim text.