Foam and Fiber Composite Structures and Methods of Manufacture
A foam-fiber composite material is provided that is made up of a monolithic foam structure having a polymer material and a fiber web having a plurality of fibers disposed substantially throughout the foam structure.
1 . A foam-fiber composite material comprising:
a monolithic foam structure comprising a polymer material; and
a fiber web comprising a plurality of fibers disposed substantially throughout the foam structure.
2 . A foam-fiber composite material according to claim 1 , wherein the fibers are distributed homogeneously throughout the foam structure.
3 . A foam-fiber composite material according to claim 1 , wherein the foam structure comprises a plurality of cross-sectional regions, each having a portion of the fibers disposed homogeneously therein.
4 . A foam-fiber composite material according to claim 1 , wherein the fibers are disposed so as to provide a predetermined variable distribution of fibers within the foam structure.
5 . A foam-fiber composite material according to claim 1 , wherein the foam structure comprises a polymer selected from the set consisting of a hydrophobic polymer material and a hydrophilic polymer material that is a product of a reaction between at least one prepolymer and an aqueous solution.
6 . A foam-fiber composite material according to claim 5 , wherein the aqueous solution is an emulsion selected from the set consisting of a latex emulsion and a silicone emulsion.
7 . A foam-fiber composite material according to claim 5 , wherein the prepolymer comprises at least one polyisocyanate of the set consisting of an aromatic polyisocyanate, an aliphatic polyisocyanate, and a cycloaliphatic polyisocyanate.
8 . A foam-fiber composite material according to claim 5 , wherein the prepolymer comprises an isocyanate selected from the set consisting of diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI).
9 . A foam-fiber composite material according to claim 1 , wherein the polymer material is a polyurethane.
10 . A foam-fiber composite material according to claim 1 , wherein the polymer material is selected from the set consisting of a silicone and a latex.
11 . A foam-fiber composite material according to claim 1 , wherein the foam structure further comprises at least one releasable additive adapted for release and application to a surface contacted by the foam-fiber composite material, the at least one releasable additive selected from the group consisting of antimicrobials, antibiotics, vitamins, sliver, lubricants, biologicals, pharmaceuticals, bactericides, botanicals, cosmetic ingredients, perfumes, detergents, soaps, disinfectants, emollients, volatile compounds, and any combination thereof.
12 . A foam-fiber composite material according to claim 1 , wherein the foam structure further comprises at least one unreleasable additive selected from the group consisting of blood clotting agents, flame retardants, cosmetic ingredients, colorants, waxes, superabsorbent polymers, cellulosic polymers, solid particles, and any combination thereof.
13 . A foam-fiber composite material according to claim 1 , wherein the plurality of fibers includes at least one of the set consisting of polymeric fibers, natural fibers, carbon fibers, glass fibers, mineral fibers and metal fibers.
14 . A foam-fiber composite material according to claim 1 , wherein at least a portion of the plurality of fibers have a hydrophilic surface.
15 . A foam-fiber composite material according to claim 1 , wherein the plurality of fibers are comprised of a polyolefin polymer.
16 . A foam-fiber composite material according to claim 1 , wherein the fiber web comprises at least one of the set consisting of a woven fabric, a non-woven fabric, and a self-sustaining bonded fiber structure.
17 . A foam-fiber composite material according to claim 1 having a thickness in a range of about 1 mm to about 50 mm.
18 . A foam-fiber composite material according to claim 1 having a thickness in a range of about 2 mm to about 6 mm.
19 . A foam-fiber composite material according to claim 1 , wherein the foam-fiber composite material is configured for use as one of the set consisting of a wound care dressing, a negative pressure wound therapy dressing, an antimicrobial pad, a drug delivery device, a cosmetic pad, a cleaning pad, and a hemostatic wound dressing.
20 . A method of forming a foam-fiber composite material comprising:
providing a web of fibers having a loft and a basis mass;
providing a polymer foam precursor comprising a plurality of reactants;
dispensing the polymer foam precursor onto the web of fibers;
forcing penetration of the polymer foam precursor into and through the web of fibers; and
allowing the polymer foam precursor reactants to react to form a monolithic foam structure having the plurality of fibers disposed throughout.
21 . A method of forming a foam-fiber composite material according to claim 20 , wherein the action of forcing penetration includes:
passing the plurality of fibers and the foam reactants through a nip roller gap.
22 . A method of forming a foam-fiber composite material according to claim 21 , wherein a height of the nip roller gap is established so as to assure distribution of the plurality of fibers throughout the monolithic foam structure.
23 . A method of forming a foam-fiber composite material according to claim 20 , wherein the web of fibers comprises a plurality of fiber web layers, each having different physical characteristics.
24 . A method of forming a foam-fiber composite material according to claim 23 , wherein each fiber web layer comprises different fiber materials.
25 . A method of forming a foam-fiber composite material according to claim 20 , wherein the actions of dispensing and forcing penetration are carried out prior to any significant reaction of the polymer foam precursor reactants.
26 . A method of forming a foam-fiber composite material according to claim 20 wherein the polymer foam precursor reactants comprise a polyurethane prepolymer and an aqueous solution.
27 . A method of forming a foam-fiber composite material according to claim 20 , wherein the polymer foam precursor reactants comprise at least one polyisocyanate of the set consisting of an aromatic polyisocyanate, an aliphatic polyisocyanate, and a cycloaliphatic polyisocyanate.
28 . A method of forming a foam-fiber composite material according to claim 20 , wherein the monolithic foam structure comprises one of the set consisting of a polyurethane, a silicone polymer, and a latex polymer.
29 . A method of forming a foam-fiber composite material according to claim 20 , further comprising:
adding at least one releasable additive to one of the foam reactants, the at least one releasable additive being adapted for release and application to a surface contacted by the monolithic foam structure.
30 . A method of forming a foam-fiber composite material according to claim 29 , wherein the at least one releasable additive is selected from the group consisting of antimicrobials, antibiotics, vitamins, sliver, lubricants, biologicals, pharmaceuticals, bactericides, botanicals, cosmetic ingredients, perfumes, detergents, soaps, disinfectants, emollients, volatile compounds, and any combination thereof.
31 . A method of forming a foam-fiber composite material according to claim 20 , further comprising:
adding at least one unreleasable additive selected from the group consisting of blood clotting agents, flame retardants, cosmetic ingredients, colorants, waxes, superabsorbent polymers, cellulosic polymers, solid particles, and any combination thereof.