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Multiple zone limiting orifice drying of cellulosic fibrous structures ...

 Donald E. Ensign et al
A limiting orifice through-air-drying apparatus for papermaking or other absorbent embryonic webs. The apparatus has a first zone and a second zone. The first zone is maintained at a differential pressure less than the breakthrough pressure, while the second zone is maintained at a differential...
Inventors: Donald E. Ensign, Michael G. Stelljes, Jr., Paul D. Trokhan
Assignee: The Procter & Gamble Company
Primary Examiner: Dinnatia Doster

U.S. Classification
34444; 34116; 34114

International Classification
F26B 300

View patent at USPTO

Citations

Patent NumberTitleIssue date
RE28459(unknown)Jul 1975
4172910Coating of papermaking fabricsOct 30, 1979
4251928Metal impregnated dryer fabricFeb 24, 1981
4329201Constant vacuum felt dewatering systemMay 11, 1982
4528239Deflection memberJul 9, 1985
4556450Method of and apparatus for removing liquid for webs of porous materialDec 3, 1985
4583302Helical dryer belt with profiled permeabilityApr 22, 1986
4888096Roll press for removing water from a web of paper using solid grooved roll and compressed airDec 19, 1989
4921750Papermaker's thru-dryer embossing fabricMay 1, 1990
4942675Apparatus and method for regulating the profile of a paper web passing over a Yankee cylinder in an integrated IR-dryer/Yankee hoodJul 24, 1990
4973385Vacuum water drawing cylinder for making paperNov 27, 1990
5020242Guide roll for a porous beltJun 4, 1991
5228954Cellulose pulps of selected morphology for improved paper strength potentialJul 20, 1993
5245025Method and apparatus for making cellulosic fibrous structures by selectively obturated drainage and cellulosic fibrous structures produced therebySep 14, 1993
5274930Limiting orifice drying of cellulosic fibrous structures, apparatus therefor, and cellulosic fibrous structures produced therebyJan 4, 1994
5347728Suction roll, especially for a paper web drierSep 20, 1994
5465502Suction roll in particular for a paper web dryerNov 14, 1995

Claims

What is claimed is:

1. A process for limiting orifice through-air drying an absorbent embryonic web, said process comprising the steps of:

providing an absorbent embryonic web to be dried and having a moisture distribution therein, said embryonic web having a consistency or at least 18 percent;
providing a means for causing airflow through said embryonic web;
providing a support member to support said embryonic web;
providing a limiting orifice through-air-drying apparatus on the side or said embryonic web opposite said support member, so that said embryonic web is intermediate said support member and said apparatus, wherein said apparatus is the limiting orifice for said airflow, said apparatus having a plurality or distinct zones for airflow therethrough, said zones having mutually different differential pressures relative to the atmospheric pressure;
disposing said embryonic web on said support member; and
causing airflow through said embryonic web and said apparatus, whereby moisture is removed from said embryonic web in said second zone at a rate or at least 5 pounds or water per pound or embryonic web per second.

2. The process according to claim 1, wherein said plurality of zones comprises two zones, a first zone and a second zone, said first zone having a lesser differential pressure than said second zone.

3. The process according to claim 2, wherein said second zone is maintained at a differential pressure greater than the breakthrough pressure of said apparatus.

Drawings