Abstract: Apparatus for drying a web and modifying the moisture profile of the web includes a housing within which is disposed a through air dryer roll supporting a web. A fan located at an end of the roll causes flow of air through the web while the web is on the roll and through openings in the roll into the interior of the roll. The air then flows through a roll end and into the interior of the housing externally of the roll for recirculation back into the roll interior through the web and through the openings in the roll. Heaters heat the flowing air and are used to modify the moisture profile of the web. The apparatus is very compact.

Abstract: Apparatus and method for drying a wet web and modifying the moisture profile of the web. A plurality of gas burners are located within the interior of a through air dryer hood to variably heat air passing through the hood interior before it contacts a wet web on a through air dryer web support. The flowing air within the hood interior is divided into air flow portions directed toward different incremental width portions of the wet web. The burners are separately controlled to vary the heat of the individual flowing air portions to provide a uniform web moisture profile.

Abstract: Apparatus for drying a wet web, such as a wet paper web, includes a through air dryer roll. A rotatable fan member having fan blades is located within the through air dryer roll interior at one end of the through air dryer roll. Rotation of the fan member causes air flow through a web on the through air dryer roll, through openings of the through air dryer roll into the through air dryer roll interior, through the end of the through air dryer roll accommodating the fan member, and through an air flow passageway to the exterior of the through air dryer roll.

Abstract: Blistering of a wet paper web upon a yankee dryer drum is controlled by directing compressed dry air toward the wet paper web in the space between a pressure roll external of the yankee dryer hood and the entry opening between the dryer hood and the yankee dryer drum. The flow of compressed air is controlled so that air flow can be modified across the full width of the wet paper web.

Abstract: A paper web in a paper machine including a yankee dryer is dried and the moisture profile thereof controlled by arraying a plurality of gas burners in a cross-machine direction within the hood of the yankee dryer to direct heat toward different incremental width portions of the paper web. The burners are independently controlled by a scanning moisture gauge.

Abstract: An adiabatic saturator receives a sample of exhaust air exiting a yankee dryer hood to determine the humidity of the exhaust air. The humidity is determined by temperature readings of the exhaust air, saturated air exiting the interior of a saturator cell, and water supplied to the saturator cell interior. An air distributor in the saturator cell interior promotes saturation of the exhaust air and a backflush mechanism backflushes the saturator cell interior to keep the water in the cell interior clean.

Abstract: Blistering of a wet paper web upon a yankee dryer drum is controlled by directing compressed dry air toward the wet paper web in the space between a pressure roll external of the yankee dryer hood and the entry opening between the dryer hood and the yankee dryer drum. The flow of compressed air is controlled so that air flow can be modified across the full width of the wet paper web.

Abstract: Apparatus for drying a wet paper web during manufacture of the paper web. The apparatus allows the moisture profile of the web to be carefully controlled and adjusted. The apparatus includes a rotatable dryer drum and a hood partially encompassing the rotatable dryer drum. A plurality of elongated heater nozzle boxes are disposed in the hood interior and extend across the dryer drum in the cross-machine direction, the elongated heater nozzle boxes being arrayed side-by-side in the machine direction. A plurality of gas burners is located in each of the nozzle box interiors and arranged side-by-side along the length of the nozzle box interiors for producing hot combustion gases within the nozzle box interiors of the heater nozzle boxes.

Abstract: One or more nozzle boxes are supported by support walls of a yankee dryer hood. The mounting arrangement serves to maintain the nozzle boxes concentric to the yankee, reduce thermal stresses, and alleviate edge misalignment problems between the nozzle boxes and web cages caused by thermal expansion.