Method and apparatus for opening a nip in an extended-nip press
AssigneeValmet Paper Machinery Inc.
InventorJorma Laapotti
Life of this patent
Estimating the term…
Abstract
A method and apparatus for opening a nip in an extended-nip press in which a nip is formed by a pair of rolls. A loading shoe of the loading members of an extended-nip press roll in the nip is shifted to an open position and apart from the glide-belt mantle when the nip is opened. An inner end-flange part of the end flange is operatively coupled with bearing means of a glide-belt mantle and is rotated in a direction parallel to the face of a central axle of the extended-nip press roll, whereby the glide-belt mantle is removed from contact with a back-up roll since a central axis of the end-flange part is located at a distance from a central axis of the extended-nip press roll.
Claims19
A method for opening a nip in an extended-nip press, including an extended-nip press roll and a back-up roll in a nip-forming relationship, said extended-nip press roll having a central axle, a loading shoe loaded toward the nip by loading members arranged on said extended-nip press roll, said extended-nip press roll having a glide-belt mantle passing through said nip in contact with said loading shoe, said method comprising the steps of:
- providing said extended-nip press roll with an end flange having an outer end-flange part and an inner end-flange part operatively coupled by bearing means,
- coupling said glide-belt mantle to said outer end-flange part, said end flange having a central axis about which said inner end-flange part, said outer end-flange part and said glide-belt mantle rotate, said central axis of said end flange being located a distance from a central axis of said central axle of said extended-nip press roll, and
- rotating said inner end-flange part to cause said glide-belt mantle to be moved away from said back-up roll and out of the nip.
The method of claim t wherein said inner end-flange part is rotated relative to said central axle of said extended-nip press roll.
In an apparatus for opening an extended nip formed between a back-up roll and an extended-nip press roll, in which loading members are connected to a central axle of the extended-nip press roll and press a loading shoe toward the back-up roll, and in which a felt carries a web through the nip, a glide-belt mantle passing through the nip in contact with the loading shoe, the improvement comprising
- said extended-nip press roll having an end flange comprising an outer end-flange part to which said glide-belt mantle is attached and an inner end-flange part, said end flange and thus said inner end-flange part having a central axis arranged eccentric with respect to a central axis of said central axle of said extended-nip press roll,
- bearing means situated between said inner end-flange part and said outer end-flange part for permitting rotation of said inner end-flange part relative to said outer end-flange part, and
- means for rotating said inner end-flange part to utilize the eccentricity of said inner end-flange part and move said glide-belt mantle relative to said back-up roll.
A nip having an opening arrangement, comprising
- a back-up roll,
- an extended nip press roll arranged adjacent to said backup roll to form a press nip, said press roll having a central axle having a central axis, said press roll having an end flange comprising an outer end-flange part and an inner end-flange part, said end flange and thus said inner end-flange part having a central axis arranged eccentric with respect to said central axis of said central axle of said press roll,
- loading members connected to said central axle of said press roll,
- a loading shoe arranged to be pressed by said loading members in a direction toward said back-up roll,
- a glide-belt mantle attached to said outer end-flange part,
- bearing means situated between said inner end-flange part and said outer end-flange part for permitting rotation of said inner end-flange part relative to said outer end-flange part, and
- means for rotating said inner end-flange part to utilize the eccentricity of said inner end-flange part and move said glide-belt mantle relative to said back-up roll.
Dependencies are inferred from the claim text.