High yield fiber sheets

Details High yield fiber sheets High yield fiber sheets

1979-05-21

1981-01-27

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With formation of web or article

162 28, 162 83, 162141, 162201, 264121, D21C 306, D21H 514, D04H 120

Patent

active

042473624

ABSTRACT:
Wet-laid sheets of softwood high yield fibers in combination with hardwood high yield fibers. The sheets, which are strong enough to be handled by commercial equipment, are formed on conventional papermaking machines using a furnish comprising a major proportion of softwood high yield fibers in admixture with a minor proportion of hardwood high yield fibers. The hardwood high yield fibers are specially prepared by a procedure comprising treating hardwood with relatively high levels of chemicals under relative stringent conditions and defibrating the treated hardwood with relatively high levels of power input. Airfelts made from these sheets exhibit low wet densities. Processes for making the sheets and the airfelts are also provided.

REFERENCES:
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patent: 2131097 (1938-09-01), Drewsen
patent: 2325055 (1943-07-01), Heritage
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patent: 4065347 (1977-12-01), Aberg et al.
patent: 4116758 (1978-09-01), Ford et al.
patent: 4120747 (1978-10-01), Sarge et al.
patent: 4145246 (1979-03-01), Goheen et al.
patent: 4152197 (1979-05-01), Lindahl et al.

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