Method and apparatus for production of a reinforcement bar
AssigneeAs Spilka International Ltd.
InventorKare Stafset
Life of this patent
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Abstract
A method for fabrication of a bent reinforcing rod in a composite material is described, where the reinforcing rod is composed of longitudinal fibers and a sheathing layer of fibers or foil, comprising the steps: to moisten fiber thread with a binding agent, to reel the moistened fiber thread to a bundle with a closed, approximately circular shape, consisting of a layer of longitudinal, parallel fibers of a desired thickness, whereby all the fibers in the layer obtain an approximately equal axial tightening, and to envelope an outer layer of fiber threads, and/or foil, or other suitable material, around the layer of longitudinal fibers, and that the fabricated blank is given a final form in a second forming process. The invention also relates to a device (10) for carrying out the method.
Claims15
A method for fabrication of a reinforcing blank from a composite material, wherein the reinforcing blank is fabricated of longitudinal fibres and a sheathing layer of a material selected from the group consisting of fibre and foil, and wherein fibre thread is moistened with a binding agent, comprising the following steps:
- reeling the moistened fibre thread onto a rotational plate comprising a number of holding means for fibre threads, to a blank bundle in a closed, approximately circular shape, comprising a layer of desired thickness of longitudinal, parallel fibres, whereby all longitudinal, parallel fibres in the layer achieve approximately equal axial tightening;
- enveloping an outer layer of a material selected from the group consisting of fibre threads, foil/band and mixture thereof, around the layer of longitudinal fibres;
- and finishing the fabrication of the prepared blank in a second forming process, wherein said enveloping comprises winding on itself, an outer layer of a material selected from the group consisting of fibre threads, foil/band and mixture thereof, in a helical form around the layer of longitudinal fibres.
A method for fabrication of a reinforcing blank from a composite material, wherein the reinforcing blank is fabricated of longitudinal fibres and a sheathing layer of a material selected from the group consisting of fibre and foil, and wherein fibre thread is moistened with a binding agent, comprising the following steps:
- reeling the moistened fibre thread onto a rotational plate comprising a number of holding means for fibre threads, to a blank bundle in a closed, approximately circular shape, comprising a layer of desired thickness of longitudinal, parallel fibres, whereby all longitudinal, parallel fibres in the layer achieve approximately group axial tightening;
- enveloping an outer layer of a material selected from the group consisting of fibre threads, foil/band and mixture thereof, around the layer of longitudinal fibres;
- and finishing the fabrication of the prepared blank in a second forming process, wherein said enveloping comprises knitting on itself, an outer layer of a material selected from the group consisting of fibre threads, foil/band and mixture thereof, around the layer of longitudinal threads.
A device for reeling and winding of fibre thread for fabrication of a reinforcing blank from a composite material comprising:
- a rotational plate comprising a number of holding means for fibre threads, where the holding means are arranged mutually spaced apart adjacent to the outer edge of the plate, for reeling of a blank with a closed, approximately circular shape, comprising a layer of desired thickness of longitudinal, parallel fibres, whereby all longitudinal, parallel fibres in the layer achieve approximately equal axial tightening, and
- at least one winding appliance arranged to wind a material selected from the group consisting of fibre threads, foil, and mixture thereof, in a helical form around the longitudinal fibre threads.
Dependencies are inferred from the claim text.