Device for removing a web from a drying cylinder

A device for removing a web from a drying cylinder in a drying section of a paper making machine:

• the drying section comprising:
• a rotatable drying cylinder having a peripheral surface;
• a porous web support belt which passes partly around the cylinder peripheral surface;
• the belt having a side which supports the web against the drying cylinder peripheral surface as the belt passes around the cylinder;
• means supporting the belt to move around the cylinder and to move off the cylinder surface at a removal point around the cylinder;
• the removing device comprising:
• a stationary suction box extending over the width of the belt, the suction box having a suction zone in the region around the drying cylinder which is also at the opposite sides of the removal point around the cylinder;
• first and second yieldable sealing strips between the suction box and the peripheral surface of the cylinder and extending across the direction of belt travel, the strips being spaced apart from each other in the direction around the cylinder and defining the suction zone between them around the cylinder;
• a respective sealing strip holder at the suction box for each of the strips;
• the sealing strip holders being spaced a distance from the cylinder surface, and the strips extending from their respective holders toward the cylinder surface for defining the suction zone;
• each of the sealing strips being sufficiently stiff as to remain substantially free of deformation as a result of a predetermined pressure difference between the suction zone and the surrounding area;
• said holder of at least said first one of said first and second sealing strips comprising a swingable mount for the respective sealing strip to enable the sealing strip to swing on the suction box.

A device for removing a web from a drying cylinder in a drying section of a paper making machine:

• the drying section comprising:
• a rotatable drying cylinder having a peripheral surface;
• a porous web support belt which passes partly around the cylinder peripheral surface;
• the belt having a side which supports the web against the drying cylinder peripheral surface as the belt passes around the cylinder;
• means supporting the belt to move around the cylinder and to move off the cylinder surface at a removal point around the cylinder;
• the removing device comprising:
• a stationary suction box extending over the width of the belt, the suction box having a suction zone in the region around the drying cylinder which is also at the opposite sides of the removal point around the cylinder;
• first and second yieldable sealing strips between the suction box and the peripheral surface of the cylinder and extending across the direction of belt travel, the strips being spaced apart from each other in the direction around the cylinder and defining the suction zone between them around the cylinder;
• a respective sealing strip holder at the suction box for each of the strips;
• the sealing strip holders being spaced a distance from the cylinder surface, and the strips extending from their respective holders toward the cylinder surface for defining the suction zone;
• each of the sealing strips being sufficiently stiff as to remain substantially free of deformation as a result of a predetermined pressure difference between the suction zone and the surrounding area;
• said device, in order to attain its stiffness, having at least said first one of the first and second sealing strips include a cavity within it for being filled with pressurized fluid, and the first strip is so shaped and the cavity is so shaped and positioned that pressurizing the cavity increases the stiffness of the first strip.

A device for removing a web from a drying cylinder in a drying section of a paper making machine:

• the drying section comprising:
• a rotatable drying cylinder having a peripheral surface;
• a porous web support belt which passes partly around the cylinder peripheral surface;
• the belt having a side which supports the web against the drying cylinder peripheral surface as the belt passes around the cylinder;
• means supporting the belt to move around the cylinder and to move off the cylinder surface at a removal point around the cylinder;
• the removing device comprising:
• a stationary suction box extending over the width of the belt, the suction box having a suction zone in the region around the drying cylinder which is also at the opposite sides of the removal point around the cylinder;
• first and second yieldable sealing strips between the suction box and the peripheral surface of the cylinder and extending across the direction of belt travel, the strips being spaced apart from each other in the direction around the cylinder and defining the suction zone between them around the cylinder;
• a respective sealing strip holder at the suction box for each of the strips;
• the sealing strip holders being spaced a distance from the cylinder surface, and the strips extending from their respective holders toward the cylinder surface for defining the suction zone;
• each of the sealing strips being sufficiently stiff as to remain substantially free of deformation as a result of a predetermined pressure difference between the suction zone and the surrounding area;
• at least one of the first and second sealing strips being subdivided over its length across the travel direction of the belt into a plurality of strip sections, each individually movable.