Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1991-05-07
1992-07-07
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 23, F28B 700
Patent
active
051271680
ABSTRACT:
A method and a machine are described for drying of fibrous web, especially suitable for high speed machines producing printing papers. High drying rates are obtained by subsequently pressing the two surfaces of wet web onto two large diameter dryer cylinders heated to between 100.degree. and 150.degree. C. In the first nip, the web is pressed on the dryer cylinder by a felted press roll, while and unfelted smooth roll is used to press the web on the second dryer. Drying rates obtained when practicing the invention are substantially greater than those found in conventional dryer sections. The product obtained according to this method is 30% stronger than the conventionally dried uncalendered paper, and without calendering has a smoothness and gloss similar to those of calendered conventional papers.
REFERENCES:
patent: 1873949 (1932-08-01), Williams
patent: 1951710 (1934-03-01), Schorger
patent: 3131118 (1964-04-01), Dabroski
patent: 4915026 (1990-04-01), Halme
Bennet Henry A.
Pulp and Paper Research Institute of Canada
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