Multiple zone limiting orifice drying of cellulosic fibrous structures apparatus therefor, and cellulosic fibrous structures produced thereby

Multiple zone limiting orifice drying of cellulosic fibrous structures apparatus therefor, and cellulosic fibrous structures produced thereby

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 pressu...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: TROKHAN, PAUL D, STELLJES, JR., MICHAEL G, ENSIGN, DONALD E
Format: Patent
Sprache:eng
Schlagworte:
BLASTING
DRYING
DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
HEATING
LIGHTING
MECHANICAL ENGINEERING
METHODS OF PRODUCING PAPER THEREON
PAPER-MAKING
PAPER-MAKING MACHINES
PRODUCTION OF CELLULOSE
TEXTILES
WEAPONS
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Beschreibung
Zusammenfassung: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 pressure greater than the breakthrough pressure. The residence time of the embryonic web to be dried with the apparatus is maintained at preferably less than 35 milliseconds on the first zone. Using the dual zone system described above, the overall energy required to run the apparatus can be reduced.