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US 6,698,340 B2Granted
Calender and process to treat a material web
AssigneeVoith Paper Patent GmbH
InventorsDieter Junk, Heiko Linder
Life of this patent
Estimating the term…
Abstract
Calender and process for treating a web with a roll stack that includes a plurality of rolls having two end rolls and several intermediate rolls arranged between the two end rolls. The plurality of rolls are arranged such that adjacent rolls, including a first and a second roll, of the plurality of rolls are positionable to form nips, and the adjacent rolls have deflections which differ from each other so that the second roll is positioned adjacent a convex side of the first roll, and the second roll has a weaker deflection than the first roll.
Claims22
A calender with a roll stack, comprising:
- a plurality of rolls including two end rolls and several intermediate rolls arranged between said two end rolls;
- said plurality of rolls being arranged such that adjacent rolls, comprising a first and a second roll, of said plurality of rolls are positionable to form nips;
- and
- said adjacent rolls have deflections which differ from each other so that said second roll is positioned adjacent a convex side of said first roll, and said second roll has a weaker deflection than said first roll.
1 more element
A calender with a roll stack, comprising:
- a plurality of rolls including two end rolls and several intermediate rolls arranged between said two end rolls;
- said plurality of rolls being arranged such that adjacent rolls, comprising a first and a second roll, of said plurality of rolls are positionable to form nips;
- and
- said adjacent rolls have deflections which differ from each other so that said second roll is positioned adjacent a convex side of said first roll, and said second roll has a weaker deflection than said first roll,
- wherein said adjacent rolls each have a deflection with which an amplitude of a deflection of a surface line at said convex side of said roll essentially coincides with an amplitude of a deflection of a surface line of a concave side of said second roll.
2 more elements
A calender with a roll stack, comprising:
- a plurality of rolls including two end rolls and several intermediate rolls arranged between said two end rolls;
- said plurality of rolls being arranged such that adjacent rolls, comprising a first and a second roll, of said plurality of rolls are positionable to form nips;
- and
- said adjacent rolls have deflections which differ from each other so that said second roll is positioned adjacent a convex side of said first roll, and said second roll has a weaker deflection than said first roll,
- wherein an amplitude ƒEM(i+1) of the deflection of said second roll is a function of an amplitude ƒEM(i) of the deflection of said first roll in accordance with the following relationship:
- f EM ( i + 1 ) = ( 2 D ( i + 1 ) K 2 ) 2 + 4 D ( i + 1 ) K 2 · f EU ( i ) - 2 D ( i + 1 ) K 2 whereby f EU ( i ) = f EM ( i ) - 1 4 K 2 · f EM ( i ) 2 · D ( i ) ;
- and K = 16 AB · 1 + 3 MbML - AB AB 5 + 12 MbML - AB AB ,
- AB=Machine width
- MbML=Bearing distance
- D(i)=Diameter of said first roll
- D(i+1)=Diameter of said second roll
- i=Index of said first roll
- i=1=Index of said second roll.
10 more elements
A calender with a roll stack, comprising:
- a plurality of rolls including two end rolls and several intermediate rolls arranged between said two end rolls;
- said plurality of rolls being arranged such that adjacent rolls, comprising a first and a second roll, of said plurality of rolls are positionable to form nips;
- and
- said adjacent rolls have deflections which differ from each other so that said second roll is positioned adjacent a convex side of said first roll, and said second roll has a weaker deflection than said first roll.
- wherein, when said adjacent rolls deviate from one another in terms of at least one parameter, said adjacent rolls are arranged to have different bearing distances, wherein at least one of said adjacent rolls is structured and arranged to have an adjustable bearing distance, and
- wherein said at least one adjacent roll comprises one of said plurality of intermediate rolls.
3 more elements
A process to treat a material web, said process comprising:
- forming a plurality of nips between a plurality of adjacent rolls, the plurality of adjacent rolls comprising first and second rolls;
- selecting, for the first and second rolls of at least one of said plurality of adjacent rolls, a deflection for said first roll which is different from a deflection of the second roll, so that the second roll has a weaker deflection than the first roll and is positioned adjacent a convex side of the first roll;
- guiding the web through the plurality of nips;
- and
- pressing the web in the plurality of nips.
2 more elements
A process to treat a material web, said process comprising:
- forming a plurality of nips between a plurality of adjacent rolls, the plurality of adjacent rolls comprising first and second rolls;
- selecting, for the first and second rolls of at least one of said plurality of adjacent rolls, a deflection for said first roll which is different from a deflection of the second roll;
- guiding the web through the plurality of nips;
- pressing the web in the plurality of nips;
- and
- controlling the deflection of the first roll so that an amplitude of the deflection of a surface line at a convex side of the first roll coincides with an amplitude of a deflection of a surface line at a concave side of the second roll.
3 more elements
A process to treat a material web, said process comprising:
- forming a plurality of nips between a plurality of adjacent rolls, the plurality of adjacent rolls comprising first and second rolls;
- selecting, for the first and second rolls of at least one of said plurality of adjacent rolls, a deflection for said first roll which is different from a deflection of the second roll;
- guiding the web through the plurality of nips:
- and
- pressing the web in the plurality of nips
- wherein an amplitude ƒEM(i+1) of the deflection of the second roll is a function of an amplitude ƒEM(i) of the deflection of the first roll in accordance with the following relationship:
- f EM ( i + 1 ) = ( 2 D ( i + 1 ) K 2 ) 2 + 4 D ( i + 1 ) K 2 · f EU ( i ) - 2 D ( i + 1 ) K 2 whereby f EU ( i ) = f EM ( i ) - 1 4 K 2 · f EM ( i ) 2 · D ( i ) ;
- and K = 16 AB · 1 + 3 MbML - AB AB 5 + 12 MbML - AB AB ,
- AB=Machine width
- MbML=Bearing distance
- D(i)=Diameter of the first roll
- D(i+1)=Diameter of the second roll
- i=Index of the first roll
- i+1=Index of the second roll.
11 more elements
A calender, comprising:
- a plurality of rolls arranged in a roll stack, said plurality of rolls comprising two end rolls and several intermediate rolls arranged between said two end rolls;
- said plurality of rolls comprising a first roll and a second roll positioned adjacent each other in said roll stack, said first roll having a deflection which differs from said second rolls, and said second roll being positioned adjacent a convex side of said first roll;
- and said first roll and said second roll being positionable to form a nip.
A process for treating a web in a calender having a plurality of rolls arranged in a roll stack, the plurality of rolls including two end rolls and several intermediate rolls arranged between the two end rolls, said process comprising:
- arranging a first roll and a second roll of the plurality of rolls, which have deflections which differ from each other, adjacent each other in the roll stack, such that the second roll is positioned adjacent a convex side of the first roll;
- and
- positioning the first roll and the second roll to form a nip.
Dependencies are inferred from the claim text.