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AssigneePlasticisers Limited
InventorsIan D. Slack, David G. Ellis, Colin Firth
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The present invention discloses a reinforcement product for use in cement boards and a method of manufacturing said product and of manufacturing cement boards using this product. The reinforcement product of the present invention comprises cross-layered webs of plastic fibres with a preponderance of fibres laid in the trans-axial direction, and continuous filaments or fibrillated tapes located between the layers to impart a high degree of strength in the axial direction. The cross-layered web and the filaments or tapes are compacted to form a reinforcement product which can be rolled up and handled for further processing on cement board forming machines. The webs of plastic fibre are formed by monoaxially orientating on extruded sheet of plastics material in axial direction, then fibrillating the sheet to form a cohesive fibre mass which is cut into lengths and carded to break up the film into a coarse fibrous mass which when stripped from the carding machine forms said plastic fibre web. This reinforcement product is made, according to the present invention in sequential steps and is either impregnated with cement or sandwiched with cement layers to form the required cement board.
A reinforcement product for use in cement boards, comprising cross layered webs of plastic fibre with a preponderance of fibres laid in a trans-axial direction, and continuous filaments or fibrillated tapes located between the layers to impart a high degree of strength in the linear direction, the cross-laid web and the filaments or tapes being compacted together to form a reinforcement product which can be rolled up and handled for further processing on cement board forming machines, the webs of plastic being formed from a sheet or film of plastics material which has been monoaxially orientated in the linear direction, fibrillated to form a cohesive fibre mass, cut into desired lengths, carded to break up the film into a coarse fibre mass, and stripped from the carding machine to form a continuous web of fibres.
A reinforcement product for use in cement boards, comprising cross layered webs of plastic fibre with a preponderance of fibres laid in a trans-axial direction, and continuous filaments or fibrillated tapes located between the layers to impart a high degree of strength in the linear direction, the cross-laid web and the filaments or tapes being compacted together to form a reinforcement product which can be rolled up and handled for further processing on cement board forming machines, the webs of plastic being formed from a sheet or film of polypropylene which has been monoaxially orientated in the linear direction, fibrillated to form a cohesive fibre mass, cut into desired lengths, carded to break up the film into a coarse fibre mass, and stripped from the carding machine to form a continuous web of fibres, and a further compound has been added to aid the orientation of the film and a wetting agent is added to enhance bonding of the polypropylene to cement.
A method of manufacturing a reinforcement product for use in cement boards, a comprising the steps of extruding a sheet or film from a plastics material, monoaxially orientating the said sheet in the linear direction fibrillating the orientated sheet to form a cohesive fibre mass, cutting the fibrillated film into desired lengths, carding the cut lengths of fibrillated film on a carding machine, to break up the fibrillated film into a coarse fibrous mass, and stripping the fibrous mass from the carding machine to form a continuous coarse fibrous web, cross layering the web of fibres to ensure an even thickness with a preponderance of the fibres being laid in a transaxial direction, introducing continuous filaments or fibrillated tapes between the layers to impart a high degree of strength in the linear direction, and compacting the cross-laid web of fibres together with said continuous filaments or fibrillated tapes, to give cohesion between the fibres in the web and produce a web which can be rolled up and handled for further processing on cement board forming machines.
A method of manufacturing a reinforcement product for use in cement boards, comprising the steps of extruding a sheet or film from a plastics material, monoaxially orientating the said sheet in the linear direction, fibrillating the orientated sheet to form a cohesive fibre mass, cutting the fibrillated film into desired lengths, carding the cut lengths of fibrillated film on a carding machine to break up the fibrillated film into a coarse fibrous mass, and stripping the fibrous mass from the carding machine to form a continuous coarse fibrous web, cross-layering the web of fibres to ensure an even thickness with a preponderance of the fibers being laid in a transaxial direction, introducing continuous filaments of fibrillated tapes between the layers to impart a high degree of strength in the linear direction, and compacting the cross-laid web of fibres together with said continuous filaments of fibrillated tapes to give cohesion between the fibres in the web and produce a web which can be rolled up and handled for further processing on cement board forming machines, said plastics material being polypropylene and 10% by weight of added polyethylene to assist in the orientation of the film.
Dependencies are inferred from the claim text.