Abstract:
The present invention concerns a process for producing a thermoformable porous web using a mixture of cellulosic fibres and one or more thermoplastic materials, particularly by foam forming said mixture into a composite foam, and applying the foam into one or more layers on a support to obtain a porous pre-form web. The thus produced porous composite web can be further processed by compression moulding to give a rigid high-strength composite structure, which is suitable for use in producing, e.g. panels or plates, packages or hygiene products, insulators or filters, or printed intelligence, electronics or microcellulose products.
Abstract:
The invention relates to a moldable fibrous product, comprising foam-formed fibrous material selected from fibrous webs, paper webs, board webs, or sheets cut from any of said webs, at least one polymer selected from carbohydrate derivatives, polylactic acid, polyurethane and polyolefins impregnated in the web, and from 0.001 to 0.1% by weight of at least one foaming agent.
Abstract:
According to an example aspect of the present invention, there is provided amethod for foam assisted drying of nano-and microfibrillated cellulose, which is easily up- scalable and cost-efficient.
Abstract:
The invention relates to growing medium structures comprising Sphagnum moss, to a foam-laid method for their manufacture and to the use thereof in horticulture, landscaping and forestry applications.
Abstract:
The present invention relates to a method of forming a moulded fibrous product, comprising the steps of foaming (1) an aqueous suspension of natural fibres, optionally in combination with synthetic fibres, to provide a first fibrous foam, a surfactant may be added to aid the foaming, feeding the fibrous foam into a mould, mechanically withdrawing a part of the water (2) contained in the foam to produce a solidified, moist fibrous composition, and evaporating water (3) from the solidified, moist fibrous composition to produce a dry fibrous product.
Abstract:
A method of filtering a sludge, which consists of solid material and a liquid phase. In the method, the sludge is fed to a filtering unit, such as a suction filter, with which the solid material is separated from the liquid. According to the present invention, the sludge is treated with foam in association with the filtering, for example by mixing a pre-prepared foam into the sludge or by spreading a foam layer onto the surface of the filtrate cake. By the present invention, it is possible to increase the filtering capacity and to reduce the residual moisture of the filtrate cake and the moisture variations in the filtrate cake. It is also possible to leave out thermal drying which is used to achieve the desired residual moisture. In addition, the amount of dissolved and colloidal substance in the filtrate is reduced.