Introduction of fiber-free foam into, or near, a headbox during

Details Introduction of fiber-free foam into, or near, a headbox during Introduction of fiber-free foam into, or near, a headbox during

1997-09-04

1999-05-18

Chin, Peter

Paper making and fiber liberation

Processes and products

Pore forming in situ

162190, 162289, 162336, 162343, D21F1/02

Patent

active

059048093

ABSTRACT:
In a foam laid process for producing a non-woven web of fibrous material (such as of synthetic or cellulose fibers) substantially fiber free foam is introduced at various locations in or adjacent to a headbox to get improved results. By introducing pure foam into the foam-fiber mixture near (e.g. just before) where the foam-fiber mixture is introduced into the headbox a more uniform basis weight profile of the non-woven web produced may be provided (e.g. a basis weight variation of about 0.5% or less). By introducing another stream of substantially fiber free foam into the headbox at a surface remote from the foraminous element, to flow along the surface (typically parallel to the flow of the foam fiber mixture), it is possible to minimize shear of fibers in the headbox so that the fibers do not become unidirectional, in the direction of movement of the foraminous element, and keep the surface clean. The surface is typically a roof surface of an inclined headbox.

REFERENCES:
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patent: 3938782 (1976-02-01), Robertson
patent: 4049491 (1977-09-01), Brandon et al.
patent: 4443297 (1984-04-01), Cheshire et al.
patent: 4686006 (1987-08-01), Cheshire et al.
patent: 4944843 (1990-07-01), Wallace et al.
patent: 5011575 (1991-04-01), Keller

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