Air/water hybrid former

Details Air/water hybrid former Air/water hybrid former

1982-07-14

1984-12-04

Chin, Peter

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

162201, D21F 1100

Patent

active

044862687

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, at least one of which being adapted to convey conventional aqueous stock solutions and at least one other 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 inter-fiber bonding.

REFERENCES:
patent: 4046622 (1977-09-01), Attwood et al.
patent: 4344818 (1982-08-01), Nuttall et al.

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