Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1993-04-27
1995-04-11
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
162206, 1623591, 34454, 34629, 34634, D21F 302, F26B 1102
Patent
active
054046548
ABSTRACT:
A paper web impulse drying apparatus and method. A paper or paperboard web, typically of indefinite length, is treated after issuing from a Fourdrinier or other paper making apparatus by passing it through the nip of a pair of rolls, at least one of which is heated. The rolls both compress the web and raise it to a relatively high temperature. Such treatment enhances certain properties of the web. Web delamination due to flashing of superheated water, after the web leaves the nip, is prevented by both (a) a steam chamber on the exit side of the nip through which the web passes, and (b) heating the web prior to its entrance into the nip. This permits lower roll temperatures to be employed, thereby decreasing the magnitude of the sudden decrease in pressure experienced by the web as it exits from the roll nip. By preheating the sheet and passing it through the steam chamber, the temperature of the heated drying roll or rolls can be decreased to 120.degree.-150.degree. C., thus decreasing the thickness of the densified layer at that surface of the paper web which is contacted by a heated roll and preventing web delamination caused by flashing.
REFERENCES:
patent: 1691930 (1928-11-01), Montgomery
patent: 1726834 (1929-09-01), Hopkins
patent: 2197463 (1940-04-01), Bradner
patent: 2208511 (1940-07-01), Ellis
patent: 2355391 (1944-08-01), Nelson
patent: 2370811 (1945-03-01), Osgood
patent: 2456301 (1948-12-01), Miller
patent: 3281952 (1963-08-01), Mullaney
patent: 3560333 (1971-02-01), Douglas et al.
patent: 3639207 (1972-02-01), Genz
patent: 3938261 (1976-02-01), Anderson
patent: 4163688 (1979-08-01), Kan Kaanpaa
patent: 4188731 (1980-02-01), Rauskolb
patent: 4249992 (1981-02-01), Wells
patent: 4272316 (1981-06-01), Justus
patent: 4351700 (1982-09-01), Dove
patent: 4506457 (1985-03-01), Lehtinen
patent: 4658716 (1987-04-01), Boissevain
patent: 4942675 (1990-07-01), Sundouist
Babinsky Vladislav A.
Mumford Warren G.
Bennet Henry A.
Doerrler William C.
Doyle Michael J.
International Paper Company
LandOfFree
Chambered nip drying of paperboard webs does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Chambered nip drying of paperboard webs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chambered nip drying of paperboard webs will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1530765