Claims
- 1. A limiting orifice though-air-drying papermaking apparatus in combination with an absorbent embryonic web having moisture distributed therein, said apparatus comprising a limiting orifice for airflow through said embryonic web, wherein said apparatus further comprises a plurality of distinct zones, comprising, in order, at least a first zone and a second zone, said distinct zones having mutually different differential pressures relative to the atmospheric pressure, and having means to enable said embryonic web to have a residence time on said first zone of less than about 35 milliseconds.
- 2. An apparatus according to claim 1, wherein said residence time is less than 25 milliseconds.
- 3. An apparatus according to claim 2, wherein said residence time is less than 15 milliseconds.
- 4. An apparatus according to claim 1, wherein said plurality of zones comprises two zones, a first zone and a second zone.
- 5. An apparatus according to claim 4, wherein said first zone has a differential pressure less than the break-through pressure of said apparatus.
- 6. An apparatus according to claim 5, wherein said second zone has a differential pressure greater than the breakthrough pressure of said apparatus.
- 7. An apparatus according to claim 4, wherein said first zone consumes less than 5 horsepower per square foot.
- 8. An apparatus according to claim 7 wherein said apparatus has a power consumption of less than 7 horsepower per square foot of embryonic web in said first zone.
- 9. An apparatus according to claim 7 wherein said apparatus has a power consumption of less than 20 horsepower per square foot of embryonic web in said second zone.
- 10. An apparatus according to claim 9 wherein said apparatus has a power consumption of less than 18 horsepower per square foot of embryonic web in said second zone.
- 11. An apparatus according to claim 10 wherein said apparatus has a power consumption of less than 16 horsepower per square foot of embryonic web in said second zone.
- 12. An apparatus according to claim 1, wherein said embryonic web comprises a cellulosic fibrous structure having a pulp filtration resistance of 10 to 11.
Parent Case Info
This is a divisional of application Ser. No. 08/486,874, filed on Jun. 7, 1995.
US Referenced Citations (15)
Divisions (1)
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Number |
Date |
Country |
Parent |
486874 |
Jun 1995 |
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