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
34453; 34115; 34117 International Classification
F26B 300 View patent at USPTO |
Citations|
| RE28459 | (unknown) | Jul 1975 | | 4172910 | Coating of papermaking fabrics | Oct 30, 1979 | | 4251928 | Metal impregnated dryer fabric | Feb 24, 1981 | | 4329201 | Constant vacuum felt dewatering system | May 11, 1982 | | 4528239 | Deflection member | Jul 9, 1985 | | 4556450 | Method of and apparatus for removing liquid for webs of porous material | Dec 3, 1985 | | 4583302 | Helical dryer belt with profiled permeability | Apr 22, 1986 | | 4888096 | Roll press for removing water from a web of paper using solid grooved roll and compressed air | Dec 19, 1989 | | 4921750 | Papermaker's thru-dryer embossing fabric | May 1, 1990 | | 4942675 | Apparatus and method for regulating the profile of a paper web passing over a Yankee cylinder in an integrated IR-dryer/Yankee hood | Jul 24, 1990 | | 4973385 | Vacuum water drawing cylinder for making paper | Nov 27, 1990 | | 5274930 | Limiting orifice drying of cellulosic fibrous structures, apparatus therefor, and cellulosic fibrous structures produced thereby | Jan 4, 1994 |
Referenced by|
| 6105276 | Limiting orifice drying medium, apparatus therefor, and cellulosic fibrous structures produced thereby | Aug 22, 2000 | | 6158144 | Process for capillary dewatering of foam materials and foam materials produced thereby | Dec 12, 2000 | | 6199296 | Seal arrangement for through-air drying papermaking machine | Mar 13, 2001 | | 6434856 | Variable wet flow resistance drying apparatus, and process of drying a web therewith | Aug 20, 2002 | | 6631566 | Method of drying a web | Oct 14, 2003 | | 6746573 | Method of drying fibrous structures | Jun 8, 2004 | | 6959503 | Method and apparatus for removing liquid from substrate surfaces using suction | Nov 1, 2005 | | 6977028 | Method of drying a web | Dec 20, 2005 | | 7125473 | Apparatus and method for conditioning a web on a papermaking machine | Oct 24, 2006 |
ClaimsWhat is claimed is: 1. A process for limiting orifice through-air drying a cellulosic fibrous structure, said process comprising the steps of: - providing an absorbent embryonic web to be dried and having a moisture distribution therein;
- 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 of 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 of 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; and
- transporting said embryonic web relative to said apparatus, whereby said embryonic web has a residence time in said first zone of less than 35 milliseconds.
2. A process according to claim 1, wherein said residence time is less than 25 milliseconds. 3. A process according to claim 2, wherein said residence time is less than 15 milliseconds. 4. A cellulosic fibrous structure produced by the process of claim 1. 5. A cellulosic fibrous structure produced by the process of claim 2. |
