Paper making and fiber liberation – Apparatus – With beating – refining – and/or disintegrating means
Patent
1996-09-11
1997-07-08
Czaja, Donald E.
Paper making and fiber liberation
Apparatus
With beating, refining, and/or disintegrating means
162 23, 162 28, 162234, 241 28, 241 31, 241244, D21D 100, D21D 120
Patent
active
056456905
ABSTRACT:
A process and apparatus is disclosed for treating fibrous material under pressure which includes at least two pressure relief devices. The pressure relief devices are arranged so that only one at a time is exposed to pressure during the treatment process. When the exposed pressure relief device is ruptured in response to an abnormal increase in pressure, the ruptured device may be isolated and the second pressure relief device exposed to the operating pressure so that the treatment apparatus may be operated on a substantially continuous basis.
REFERENCES:
patent: 2293670 (1942-08-01), Sickman
patent: 4221631 (1980-09-01), Hellerqvist et al.
patent: 4236959 (1980-12-01), Reinhall
Czaja Donald E.
Leavitt Steven B.
Westvaco Corporation
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