Suction box in a paper machine

An arrangement for transferring a web from a first wire to a second wire in a paper machine, comprising

• first guide means for guiding the first wire to support the web over a run thereof,
• a suction box including
• means defining a vacuum chamber through which suction is applied,
• adjustable ribs adapted to load the first wire, said ribs being arranged such that spaces are defined between said ribs and communicate with said vacuum chamber,
• loading means arranged in associated with said ribs to load said ribs toward the first wire, and
• retaining means for retaining said ribs, said retaining means being structured and arranged such that while suction is applied through said vacuum chamber and said spaces between said ribs, said ribs cause the wire to curve while running over said ribs such that tension of the wire lowers a normal force produced by the suction;
• second guide means for guiding the second wire to receive the web from the first wire, and
• a roll arranged in opposed relationship to said suction box such that the first and second wires run between said roll and said suction box, said roll having an open-faced mantle defining a suction chamber, the web being transferred from the first wire to the second during its passage between said suction box and said roll.

A suction box for applying a suction to a wire in a paper machine, comprising:

• a vacuum chamber structured and arranged to transmit said suction to said wire,
• a decking surface having a concave profile directed toward said wire,
• a plurality of ribs structured and arranged for loading a wire, said ribs being arranged such that spaces are defined between adjacent ribs of said plurality of ribs and wherein said plurality of ribs are structured and arranged to communicate with said vacuum chamber,
• loading means arranged in association with said ribs for loading said ribs toward the wire,
• retaining means for retaining said ribs on said concave decking surface, said retaining means being structured and arranged such that while suction is applied through said vacuum chamber and through said spaces between said ribs, said ribs cause the wire to curve while running over said ribs such that tension of the wire lowers a normal force produced by the suction, wherein said retaining means comprise substantially U-section holders open toward the wire, each of said holders retaining a respective one of said ribs, and
• locking means arranged in connection with each of said ribs for locking said rib in the respective holder apart from the wire.

A suction box for applying a suction to a wire in a paper machine, comprising:

• a vacuum chamber structured and arranged to transmit said suction to said wire,
• a decking surface having a concave profile directed toward said wire,
• a plurality of ribs structured and arranged for loading a wire, said ribs being arranged such that spaces are defined between adjacent ribs of said plurality of ribs and wherein said plurality of ribs are structured and arranged to communicate with said vacuum chamber,
• loading means arranged in association with said ribs for loading said ribs toward the wire,
• retaining means for retaining said ribs on said concave decking surface, said retaining means being structured and arranged such that while suction is applied through said vacuum chamber and through said spaces between said ribs, said ribs cause the wire to curve while running over said ribs such that tension of the wire lowers a normal force produced by the suction, wherein said retaining means comprise substantially U-section holders open toward the wire, each of said holders retaining a respective one of said ribs, and
• wherein said ribs have a bottom surface in opposed relationship to a bottom, interior surface of the respective holder, said loading means being arranged between said bottom of each of said ribs and said bottom, interior surface of the respective holder such that said ribs are displaceable by said loading means against the wire.

A suction box for applying a suction to a wire in a paper machine, comprising:

• a vacuum chamber structured and arranged to transmit said suction to said wire,
• a decking surface having a concave profile directed toward said wire,
• a plurality of ribs structured and arranged for loading a wire, said ribs being arranged such that spaces are defined between adjacent ribs of said plurality of ribs and wherein said plurality of ribs are structured and arranged to communicate with said vacuum chamber,
• loading means arranged in association with said ribs for loading said ribs toward the wire,
• retaining means for retaining said ribs on said concave decking surface, said retaining means being structured and arranged such that while suction is applied through said vacuum chamber and through said spaces between said ribs, said ribs cause the wire to curve while running over said ribs such that tension of the wire lowers a normal force produced by t he suction,
• displacement means arranged in connection with the suction box for displacing the suction box toward and away from the wire.