Apparatus and method for drying a wet web and modifying the moisture profile thereof
AssigneeFort James Corporation
InventorJohn R. Joiner
Life of this patent
Estimating the term…
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.
Claims23
Apparatus for drying a wet web and modifying the moisture profile of said wet web, said apparatus comprising, in combination:
- a through air dryer hood defining a hood interior and at least one air supply inlet communicating with said hood interior;
- through air dryer web support means mounted for movement relative to said through air dryer hood, said through air dryer web support means for engaging a wet web as said wet web moves in a machine direction in communication with said hood interior;
- and
- heater means within said hood interior for heating air within said hood interior during movement of said air from said air supply inlet to said through air dryer web support means for drying said wet web.
Apparatus for drying a wet paper web and modifying the moisture profile of said wet paper web, said apparatus comprising, in combination:
- a through air dryer hood defining a hood interior accommodating flowing air;
- through air dryer web support means mounted for movement relative to said through air dryer hood, said through air dryer web support means for engaging a wet web as said wet web moves in a machine direction and is engaged by air flowing through said hood interior;
- and
- a plurality of gas burners positioned within said hood interior for heating air flowing through said hood interior before said flowing air engages said wet web.
Apparatus for drying a wet web and modifying the moisture profile of said wet web, said apparatus comprising, in combination:
- a through air dryer hood defining a hood interior accommodating flowing air;
- through air dryer support means mounted for movement relative to said through air dryer hood, said through air dryer support means including an outer wall, said outer wall for engaging a wet web as said wet web moves in a machine direction and defining outer wall openings for receiving flowing air from said hood interior;
- air flow separator means within said hood interior dividing said flowing air into a plurality of air flow portions disposed side-by-side;
- and
- heater means for separately heating said air flow portions.
A method of drying a wet web and modifying the moisture profile of said wet web, said method comprising the steps of:
- transporting a wet web in a machine direction with said wet web in engagement with a web support having openings therein;
- directing flowing air through a passageway and into engagement with said wet web while said wet web is in engagement with said web support;
- passing said flowing air through said wet web and through the openings of said web support;
- while said flowing air is in said passageway, dividing said flowing air into a plurality of air flow portions disposed side-by-side;
- separately heating said air flow portions;
- and
- engaging said wet web with said heated air flow portions along different incremental wet web width portions.
Dependencies are inferred from the claim text.