US 11,512,434 B2 · Water-dispersible composite structure and method of producing the same

Abstract

A water-dispersible composite structure, which comprises one or more layers, and a method of producing the same. At least a part of the layers is formed by a fibrous web or sheet containing 50-90 parts by weight of wood fibers and 10-90 parts by weight of annual or perennial plant fibers and/or 10-50 parts by weight of synthetic short-cut fibers, and 0.1-20% by weight of a binder, calculated from the weight of the fibers, and at least a part of the binder being a water-soluble polymer and another part a water dispersible binder, and the fibrous sheet or web being produced by wet forming. By means of the invention, the fibers of the composite structure can be recovered and recycled by equipment conventionally used in the paper and paperboard industry.

Claims18

Dependent claims

A method of producing a water-dispersible composite structure, the method comprising the steps of:

conveying an aqueous fibrous slush comprising wood fibers and non-wood fibers to a foraminous support;
draining liquid through the foraminous support to form a fibrous layer;
and
applying a binder on the fibrous layer for at least partially binding the fibers,
wherein
the binder is an aqueous composition prepared by dissolving a water-soluble polymer selected from the group consisting of polyvinyl alcohol, polyvinyl acetate, and combinations thereof, in water to form an aqueous solution at a temperature of 10 to 100° C., and subsequently dispersing a water-dispersible polymer selected from the group consisting of a polyurethane dispersion, an acrylic latex, a styrene butadiene dispersion, and combinations thereof into the aqueous solution at a temperature of 20 to 100° C.

3 more elements

Dependencies are inferred from the claim text.

Water-dispersible composite structure and method of producing the same

Life of this patent

Water-dispersible composite structure and method of producing the same

Life of this patent

Abstract

Claims18