Abstract: A paper web drying apparatus is described as comprising a device for controlling an injection of air in a drying pocket of the drying apparatus. The web drying apparatus generally comprises at least three substantially axially parallel rotatable drying cylinders, first and third cylinders being vertically offset from a second cylinder and the web being consecutively trained thereover defining the pocket therebetween. The apparatus may define a traditional pocket, an offset pocket, or other such pocket configurations known in the art. The device comprises an elongated structure longitudinally mounted adjacent and substantially parallel to the first cylinder and between the first and the third cylinders.

Abstract: A paper web drying apparatus is described as comprising a device for controlling an injection of air in a drying pocket of the drying apparatus. The web drying apparatus generally comprises at least three substantially axially parallel rotatable drying cylinders, first and third cylinders being vertically offset from a second cylinder and the web being consecutively trained thereover defining the pocket therebetween. The apparatus may define a traditional pocket, an offset pocket, or other such pocket configurations known in the art. The device comprises an elongated structure longitudinally mounted adjacent and substantially parallel to the first cylinder and between the first and the third cylinders.

Abstract: The device (10) and method are used for ventilating an offset pocket space (12) located in a drying section of a papermaking machine by injecting air from a heated dry air supply inlet (11). The offset pocket space (12) is situated between a set of three axially-parallel drying cylinders (20) over which consecutively runs a paper web (14). The device (10) comprises a first air outlet (50) where a first air stream is directed into a cleft (34) defined where the felt (16) rejoins the felt roll (26), and a second air outlet (52) where a second air stream is directed in close proximity to the felt (16) at a location which is upstream of the cleft (34). In use, the device (10) and the corresponding method allow the first air stream to flow through the felt (16) and lift the paper web (14) away from the felt (16) so as to reach the offset pocket space (12). The second air stream creates an air curtain to lower the pressure in a zone between the first (50) and the second air outlet (52).

Abstract: The device (10) and method are used for ventilating an offset pocket space (12) located in a drying section of a papermaking machine by injecting air from a heated dry air supply inlet (11). The offset pocket space (12) is situated between a set of three axially-parallel drying cylinders (20) over which consecutively runs a paper web (14). A first and a third of these cylinders (20) are vertically spaced from a second one. The paper web (14) is pressed against the first and the third cylinder (20) by a felt (16) which further runs around a felt roll (26) having a rotation axis parallel to that of the cylinders (20). The felt roll (26) is disposed between the three cylinders (20) in an offset position which is closer to the first cylinder (20) than the third cylinder (20).

Abstract: The device (10) and method are used for ventilating an offset pocket space (12) located in a drying section of a papermaking machine by injecting air from at least one heated dry air supply inlet (11). The offset pocket space (12) is situated between three axially-parallel drying cylinders (20) over which consecutively runs a paper web (14). A first and a third of these cylinders (20) are vertically spaced from a second one. The paper web (14) is pressed against the first and the third cylinder (20) by a felt (16) which further runs around a felt roll (26) having a rotation axis parallel to that of the cylinders (20). The felt roll (26) is disposed between the three cylinders (20) in an offset position which is closer to the first cylinder (20) than the third cylinder (20).