The present invention relates to a foam formed solid composite, comprising: a matrix phase consisting of a mixture of nanocellulose, at least one foaming agent, and optional additives, and a dispersed phase consisting of solid low-density particles having a density of less than 1.2 kg/dm.sup.3. The present invention further relates to a method and a liquid foam composition for manufacturing the solid composite.

A textured film is provided which comprises nanocellulose. At least a first surface of the film comprises a patterned, textured surface formed by repeating protruding regions and at least one non-protruding region arranged between said protruding regions. A particular height difference between the protruding and non-protruding regions can give liquid repellent properties. Methods for making the textured film are also provided.

The present invention relates to a method for manufacturing a polymer coated cellulose based substrate useful as a barrier film, said method comprising the steps of: a) providing a cellulose based substrate comprising 50-99 wt % highly refined cellulose fibers based on the total dry weight of the cellulose based substrate; b) preparing an aqueous foam from an aqueous solution of a foam forming polymer; c) applying the aqueous foam to at least one surface of the cellulose based substrate; and d) collapsing the aqueous foam to form a polymer coating on the cellulose based substrate.

The present invention relates to a method for manufacturing a polymer coated cellulose based substrate useful as a barrier film, said method comprising the steps of: a) providing a cellulose based substrate comprising 50-99 wt % highly refined cellulose fibers based on the total dry weight of the cellulose based substrate; b) preparing an aqueous foam from an aqueous solution of a foam forming polymer; c) applying the aqueous foam to at least one surface of the cellulose based substrate; and d) collapsing the aqueous foam to form a polymer coating on the cellulose based substrate.

A dewatering apparatus for cellulosic materials includes a chamber for an aqueous solution of a cellulosic material, an inner electrode in the chamber, an outer electrode in the chamber about the inner electrode, and a power supply connected to the inner electrode and the outer electrode applying a voltage potential across the electrodes to remove water associated with the aqueous solution and to dewater the cellulosic materials.

The invention relates to a method for manufacturing a foam-formed cellulosic fibre-material comprising coarse cellulosic fibres a cellulose reinforcement fraction. Furthermore, the invention relates to a foam-formed cellulosic fibre-material, a cellulose bulk sheet for a packaging material and a laminated packaging material comprising the foam-formed cellulosic fibre-material.

The present invention was accomplished in order to provide a method for producing a sheet containing fine fibers, which enables production of a sheet containing fine fibers without producing wrinkles. The present invention provides a method for producing a sheet containing fine fibers comprising a coating step of coating a dispersion containing fine fibers having a fiber diameter of 1000 nm or smaller on a base material, and a drying step of drying the dispersion containing fine fibers coated on the base material to form a sheet containing fine fibers.

The present invention was accomplished in order to provide a method for producing a sheet containing fine fibers, which enables production of a sheet containing fine fibers without producing wrinkles. The present invention provides a method for producing a sheet containing fine fibers comprising a coating step of coating a dispersion containing fine fibers having a fiber diameter of 1000 nm or smaller on a base material, and a drying step of drying the dispersion containing fine fibers coated on the base material to form a sheet containing fine fibers.

There is provided a method of producing a sheet having a density of 0.6-1.3 g/cm.sup.3 measured according to ISO 534:2011, the sheet comprising chemically modified cellulose fibres, wherein the method comprises: a. providing chemically modified cellulose fibres, wherein charge density measured according to SCAN-CM 65:02 of the chemically modified cellulose fibres is 1200-2400 μeq/g; b. forming a fibre web by dewatering a slurry comprising the chemically modified cellulose fibres on a forming wire; and c. drying the fibre web to obtain the sheet, with the proviso that no carboxymethyl cellulose (CMC) is added to the chemically modified cellulose fibres during or prior to step b.

A wiping sheet includes a patterned part of a fiber assembling base material and a non-patterned part of the fiber assembling base material. The patterned part includes cellulose nanofiber; and the non-patterned part does not include the cellulose nanofiber.