Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With chemical or physical modification of liberated fiber
Patent
1987-07-27
1988-09-27
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With chemical or physical modification of liberated fiber
162 24, 162 28, 162 55, 162 56, 162 57, 162 90, D21C 900, D21C 908
Patent
active
047739657
ABSTRACT:
Sulfite pulp having increased tear, Scott bond, and stretch properties and above about 90% dirt reduction without bleaching. Methods for making such sulfite pulp by increasing the consistency of conventional sulfite pulp to above about 12 percent, shearing the increased consistency pulp under compressive forces to improve the tear and stretch properties of the pulp, refining the sheared pulp at pressures above atmospheric to remove dirt particles and achieve a desired freeness level, and removing fiber knots from the refined pulp.
REFERENCES:
patent: 2000562 (1935-05-01), Haglund
patent: 2355091 (1944-08-01), McDonald
patent: 3597310 (1971-08-01), Sumi et al.
Page and Seth, "The Extensional Behavior of Commercial Mechanical Pulps", Pulp & Paper Canada, 80:8, pp. T235-T237, Aug. 1979.
Seth, Barbe and Page, "The Strength of Wet Webs: A New Approach", Tappi, 65:3, pp. 135-138, Mar. 1982.
Hill, Edwards and Beath, "Curlated Pulp-A New Approach to Pulp Processing", Tappi, 33:1, pp. 36-44, Jan. 1950.
Gilbert Paul G.
Glinski Allan J.
Chin Peter
Dang Thi
Great Northern Paper
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