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AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsAntti Ojala, Kalle Nättinen, Lisa Wikström, Hannu Minkkinen, Petri Jetsu, Jani Lehmonen, Karita Kinnunen, Tuomo Hjelt
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The present invention concerns a process for producing a thermoformable porous web using a mixture of cellulosic fibers 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 molding 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.
A process for producing a thermoformable porous web using cellulosic fibres and one or more thermoplastic materials by foam forming a mixture of the cellulosic fibres and the thermoplastic material(s) into a composite foam, and applying the foam on a wire to obtain a porous pre-form web, wherein the cellulosic fibres are selected from fibres of pure cellulose or from fibres of cellulose derivatives, and wherein the one or more thermoplastic materials comprise lignin.
Dependencies are inferred from the claim text.