Fibrous filter media and process for producing same

Details Fibrous filter media and process for producing same Fibrous filter media and process for producing same

1982-01-05

1984-06-19

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With formation of web or article

162 23, 162 28, 162142, 162149, 162150, 162165, 162146, 55524, 55528, 55DIG5, 2104935, 210504, 210508, 210767, D21B 114, D21H 514

Patent

active

044551959

ABSTRACT:
The disclosure relates to a novel and highly superior filter media formed of random-laid, lignin-containing fibers, and to a process for manufacture of the filter media. The process involves selection of lignin-containing fiber source, having a lignin content of at least about 10% and thermomechanically pulping the fiber source under temperature/pressure conditions of 300.degree. F.-350.degree. F./50 psig-120 psig and a refiner energy utilization of about 8-35 HPD/ADT. The thermomechanically produced fibers are characterized by a high degree of stiffness, and an extremely smooth surface free of fine fibril formation and thus substantially non-self-bonding. An improved filter media is formed by a random lay-up of the lignin-containing fibers, typically with selected other pulp fibers having technical characteristics suitable for filter media utilization. Suitable lignin-containing fiber, produced under conditions of the invention, may be substituted with minimum effort for conventional technical fibers utilized in furnishes intended for filter media production. The new filter media is characterized by exceptionally high bulk and void volume-two highly critical characteristics of filter media. The result ing product provides equal or superior product performance at significant reductions in production cost and/or exceptional improvement in performance at equivalent production cost.

REFERENCES:
patent: 2008892 (1935-07-01), Asplund
patent: 2145851 (1939-02-01), Asplund
patent: 3388037 (1968-06-01), Asplund et al.
patent: 3773610 (1973-11-01), Shouvlin et al.
patent: 3808090 (1974-04-01), Logan et al.
patent: 3948449 (1976-04-01), Logan et al.
patent: 4009835 (1977-03-01), Syrjanen
patent: 4037792 (1977-07-01), Peterson
patent: 4136831 (1979-01-01), Cederquist et al.
patent: 4145246 (1979-03-01), Goheen et al.
patent: 4194945 (1980-03-01), Malev et al.
patent: 4219024 (1980-08-01), Patience et al.
patent: 4221630 (1980-09-01), Selander et al.
patent: 4247362 (1981-01-01), Williams
Charters, M. J., "Thermomechanical Pulpins", Paper presented Ninth European Meetings of Empire Paper Research Assoc., San Remo, Italy, Apr. 22-23, 1974.
International Conference for Timber Utilization Paris, 26-28 7/1937 on "The Influence of Defibration on the Proporties of Wallboard"(3 pages), by Dr. W. Holst, Defibrator Co. Stockholm.
Pacific Pulp and Paper Industries "Continuous Cooking and Defibration Process According to the Asplund Principle", by A. H. Lundberg (1 page).

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