Through-air drying apparatus and methods of manufacture

Through-air drying apparatus and methods of manufacture

Methods of improving the drying rate of a cellulosic web, such as a tissue web, by providing an apparatus having two noncompressive dewatering devices, such as two through-air driers, where the temperature of the drying medium supplied to each device is separately controlled. The temperature of the...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Zwick, Kenneth John, Allen, Peter John, Burazin, Mark Alan, Isom, Jr., Eric Kent, Satori, Christopher Lee, Besaw, Craig Steven, Seymour, Robert James, Lawson, Daniel Keith
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:Methods of improving the drying rate of a cellulosic web, such as a tissue web, by providing an apparatus having two noncompressive dewatering devices, such as two through-air driers, where the temperature of the drying medium supplied to each device is separately controlled. The temperature of the medium supplied to the first device may exceed 450° F., such as from about 450 to about 600° F. On the other hand the temperature of the medium supplied to the second device may be less than the temperature supplied to the first, such as from about 350 to 450° F. Drying the web in this manner not only improves drying efficiency, but also limits or prevents degradation of the web, such as the combustion of cellulosic fibers making up the web or monosaccharides associated therewith. As such, webs that are substantially free from furan and acetaldehyde may be produced by the present methods.