Air/water hybrid former

Paper making and fiber liberation – Processes and products – Non-uniform – irregular or configured web or sheet

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162162, 162123, 162129, 162130, 162146, 162201, D21H 524

Patent

active

043448186

ABSTRACT:
A method and apparatus especially adapted to produce a ply separable web requiring substantially less energy input for drying. The apparatus comprises a headbox having at least three stock flow channels, the outer channels being adapted to convey conventional aqueous stock solutions, with at least one inner channel adapted to convey airborne fibers. The resulting web, having a significant portion of the fibers in a dry state, requires less energy to dry, and the distinct layers provide shear zones therebetween which permit ply separation upon creping. Different fiber types may be provided in different layers depending upon product attributes desired, and the products may be conventionally dried or may be throughdried. An alternative embodiment requires the mixing of airborne fibers with an aqueous solution adjacent to or within the headbox, producing only surface wetting of the fibers and reduced interfiber bonding.

REFERENCES:
patent: 2881072 (1959-04-01), Clark
patent: 2913365 (1959-11-01), Osborne et al.
patent: 3954554 (1976-05-01), Curry et al.

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