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AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsAntti Ojala, Kalle Nättinen, Lisa Wikström, Hannu Minkkinen, Petri Jetsu, Jani Lehmonen, Karita Kinnunnen, Tuomo Hjelt
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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.
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, further comprising selecting the cellulosic fibres from fibres of pure cellulose, such as rayon or viscose fibres, or from fibres of cellulose derivatives, such as cellulose acetate (CA), cellulose acetate butyrate (CAB), cellulose acetate phthalate (CAP) or cellulose carbamate (CCA) fibres, preferably from pure cellulose fibres, or optionally from chemically modified fibres, modified e.g. by alkali treatment, esterification or silane treatment.
A thermoformable porous web formed from cellulosic fibres and a thermoplastic material, wherein it consists of a dried pre-form web of a composite foam, applied into one or more layers.
A process for producing a composite structure from a thermoformable porous web formed from cellulosic fibres and a thermoplastic material, wherein the thermoformable porous web consists of a dried pre-form web of a composite foam, applied into one or more layers by compression moulding the web into the desired structure.
Use of 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, further comprising selecting the cellulosic fibres from fibres of pure cellulosic or from fibres of cellulose derivative in producing panels or plates or packages, or in producing hygiene products, insulators or filters, or in producing 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-laid 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 prepreg web, wherein the cellulosic fibres are selected from fibres of pure cellulose, such as rayon or viscose fibres, or from fibres of cellulose derivatives, such as cellulose acetate (CA), cellulose acetate butyrate (CAB), cellulose acetate phthalate (CAP) or cellulose carbamate (CCA) fibres, preferably from pure cellulose fibres, or optionally from chemically modified fibres, modified e.g. by alkali treatment, esterification or silane treatment.
A thermoformable porous web formed from cellulosic fibres and a thermoplastic material, consisting of a dried prepreg web of a composite foam, applied into one or more layers.
Dependencies are inferred from the claim text.