Multiple zone limiting orifice drying of cellulosic fibrous stru

Details Multiple zone limiting orifice drying of cellulosic fibrous stru Multiple zone limiting orifice drying of cellulosic fibrous stru

1996-06-04

1997-05-06

Bennett, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34114, 34115, 34116, F26B 1102

Patent

active

056259611

ABSTRACT:
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 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.

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