The invention relates to a belt calender, comprising a first roll ( 11 ), a second roll ( 13; 15 ), and a belt loop therebetween, comprising an incompressible metal belt ( 12 ) pressed by the second roll ( 13; 15 ) against the first roll ( 11 ) to establish a calendering zone between the first roll ( 11 ) and said belt ( 12 ). The second roll ( 13; 15 ) is provided with a compressible belt section ( 14; 18 ) to be pressed against the metal belt ( 12 ).
1. A belt calender, comprising:
a first roll ( 11 ),
a second roll ( 13 ; 15 ), and
a belt loop arranged between said first and second roll, said belt loop comprising an incompressible metal belt ( 12 ) pressed by the second roll ( 13 ; 15 ) against the first roll ( 11 ) to establish a calendering zone between the first roll ( 11 ) and said incompressible metal belt ( 12 ),
wherein the first roll ( 11 ) comprises a polymer-coated roll and the second roll ( 13 ; 15 ) is provided with a resiliently compressible belt section ( 14 ; 18 ) to be pressed against the incompressible metal belt ( 12 ), the belt calender for treating both sides of a web simultaneously in the calendering zone, and wherein the incompressible metal belt extends over a plurality of guide rolls; and wherein the resiliently compressible belt section having a compressible belt extends over a plurality of guide rolls, and the compressible belt is pressed by the second roll against the incompressible metal belt.
2. A belt calender as set forth in claim 1 , wherein the metal belt ( 12 ) is adapted to be heatable and/or coolable.
3. A method for calendering a web of material in a belt calender comprising the steps of:
arranging a first roll and a second roll and a belt around said second roll, wherein said belt comprises an incompressible metal belt;
pressing said belt by said second roll against said first roll such that a calender zone is defined between the first roll and said belt;
wherein said first roll comprises a polymer-coated roll and said second roll is provided with a resiliently compressible belt section to be pressed against said metal belt; and
passing a web of material through a nip defined between the polymer coated and the metal belt to treat both sides of the web simultaneously in the calendering zone, and wherein the incompressible metal belt extends over a plurality of guide rolls; and wherein the resiliently compressible belt section having a compressible belt extends over a plurality of guide rolls, and the compressible belt is pressed by the second roll against the incompressible metal belt.
4. The method as set forth in claim 3 , wherein said metal belt is one of heatable and coolable.