Fiber moisture control in the formation of dry-laid webs

Details Fiber moisture control in the formation of dry-laid webs Fiber moisture control in the formation of dry-laid webs

1981-06-18

1986-02-25

Rosenbaum, Mark

Solid material comminution or disintegration

Processes

With heating or cooling of material

241 28, 241 33, 241 65, B02C 1912

Patent

active

045724407

ABSTRACT:
A method of and apparatus for forming an air laid, e.g., dry laid, fibrous web comprising the steps of and apparatus for defiberizing wood pulp laps, rolls or bales, preferably in a hammermill; transporting the fibers pneumatically to a forming head, and dispensing said fibers onto a foraminous support means, the aforesaid operations being carried out at conditions of high humidity such that the average fiber moisture content is at least above 2.5% by weight just prior reaching a forming header. In the preferred embodiment air at between about 150.degree. to about 200.degree. F. and having a relative humidity of between about 75 to 95% is introduced to the defiberizer to provide the requisite air moisture content. If desired over large fibers from the forming head may be recycled to the defiberizer. By practicing the invention, electrostatic charges on the fibers are reduced thereby minimizing clumping and ensuring better formation.

REFERENCES:
patent: 2008892 (1935-07-01), Asplund
patent: 2807054 (1957-09-01), Burger et al.
patent: 3903229 (1975-09-01), Mark
patent: 3987968 (1976-10-01), Moore et al.
patent: 4118832 (1978-10-01), Addy et al.
patent: 4136831 (1979-01-01), Cederquist et al.
patent: 4148439 (1979-04-01), Floden
patent: 4241881 (1980-12-01), Laumer
Wink, The Effects of Relative Humidity and Temperature on Paper Properties, TAPPI, vol. 44, No. 6, pp. 171A-178A, 6-1962.

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