Paper making and fiber liberation – Apparatus – Running or indefinite length product forming and/or treating...
Patent
1988-12-12
1990-04-10
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Running or indefinite length product forming and/or treating...
162252, 162358, 1623601, D21F 304
Patent
active
049157906
ABSTRACT:
For dewatering a paper web the pressing or press section has two separate or spaced pressing locations arranged in tandem and comprising extended nips. These pressing locations are each formed between an upper pressing surface and a lower pressing surface. The paper web to be dewatered travels between an upper felt belt and a lower felt belt. One of the felt belts extends through both pressing locations while the other felt belt only travels through the first pressing location as viewed in the direction of travel of the paper web. The paper web is only sandwiched between the two felt belts in the first pressing location. The other felt belt which is guided solely through the first pressing location is diverted away from the paper web directly downstream of the first pressing location by a pivotably mounted guide roll, so that the paper web passes through the second pressing location while being supported solely by the one felt belt guided through both pressing locations. Downstream of the second pressing location the paper web is deflected away from the one felt belt and conveyed to a drying section of the papermaking machine. In this manner, re-wetting of the paper web is reduced following each dewatering operation in the pressing locations. According to one embodiment the upper felt belt is guided through both pressing locations. The lower felt belt extends solely through the first pressing location.
REFERENCES:
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patent: 4556451 (1985-12-01), Ely
patent: 4662992 (1987-05-01), Mirsberger
patent: 4704192 (1987-11-01), Cronin
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