Tubular composite structures
View Patent ↗Tubular structures formed of helically wound layers of a composite fabric structure. The fabric structure has an inwardly facing layer in the form of a fabric base. The fabric base comprises a network of high tenacity fibers. The composite fabric structure also includes an outwardly facing layer formed of rubber. The inwardly facing layer and the outwardly facing layer are bonded together, preferably through the use of a bonding layer. The tubular structure may be used as a stand along product, as an antichafing cover for a rope, as a liner for a pipe, or the like.
1. A tubular structure comprising helically wound layers of a preformed composite narrow width fabric structure, said fabric structure comprising an inwardly facing layer comprising a fabric base, said fabric base comprising a network of high tenacity fibers, and an outwardly facing layer comprising rubber, said inwardly facing layer and said outwardly facing layer being bonded together, and said layers of said composite structure being helically wrapped about each other such that a successive layer overlaps a previous layer by about 15% to about 75% of the width of said previous layer.
2. The tubular structure of claim 1 wherein said composite fabric structure further comprises a bonding layer between said inwardly facing layer and said outwardly facing layer and bonded to said inwardly facing layer and said outwardly facing layer.
3. The tubular structure of claim 1 wherein said high tenacity fibers have a tenacity of at least about 25 grams per denier.
4. The tubular structure of claim 1 wherein said high tenacity fibers are selected from the group consisting of high modulus polyethylene, aramid, polybenzazole, liquid crystal copolyester, and blends thereof.
5. The tubular structure of claim 1 wherein said high tenacity fibers comprise high modulus polyethylene fibers.
6. The tubular structure of claim 1 wherein said fabric base comprises a woven fabric.
7. The tubular structure of claim 1 wherein said rubber comprises a natural rubber.
8. The tubular structure of claim 1 wherein said rubber comprises a composition selected from the group consisting of natural rubber and styrene butadiene; natural rubber and polybutadiene; and natural rubber, styrene butadiene and polybutadiene.
9. The tubular structure of claim 1 wherein said fabric base comprises a non-woven fabric.
10. The tubular structure of claim 9 wherein said high tenacity fibers of said non-woven fabric extend unidirectionally with respect to each other.
11. The tubular structure of claim 1 wherein said layers of said composite structure are helically wrapped about each other at an angle of between about 40 and about 60 degrees.
12. The tubular structure of claim 2 wherein said bonding layer comprises a thermoplastic material.
13. The tubular structure of claim 12 wherein said fabric base comprises high molecular weight polyethylene fibers and said rubber comprises natural rubber.
14. The tubular structure of claim 13 wherein said bonding layer comprises ethylene vinyl acetate.
15. A tubular structure comprising helically wound layers of a preformed composite narrow width fabric structure, said fabric structure comprising an inwardly facing layer comprising a fabric base, said fabric base comprising a network of high tenacity high modulus polyethylene fibers, an outwardly facing layer comprising natural rubber, and a thermoplastic bonding layer between said inwardly facing layer and said outwardly facing layer and bonded to said inwardly facing layer and said outwardly facing layer, and said layers of said composite structure being helically wrapped about each other such that a successive layer overlaps a previous layer by about 15% to about 75% of the width of said previous layer.
16. The tubular structure of claim 15 wherein said rubber comprises a composition selected from the group consisting of natural rubber and styrene butadiene; natural rubber and polybutadiene; and natural rubber, styrene butadiene and polybutadiene.
17. The tubular structure of claim 16 wherein said thermoplastic bonding layer comprises ethylene vinyl acetate.
18. The tubular structure of claim 17 wherein said fabric structure comprises a woven fabric.
19. The tubular structure of claim 17 wherein said tubular structure consists of said helically wound layers of said composite fabric structure that are wrapped about each other and are bonded together under heat and pressure.
20. A tubular structure comprising helically wound layers of a preformed composite narrow width fabric structure, said fabric structure consisting of an inwardly facing layer comprising a woven fabric base, said fabric base comprising a network of high tenacity high modulus polyethylene fibers, an outwardly facing layer comprising natural rubber, and a thermoplastic bonding layer between said inwardly facing layer and said outwardly facing layer and bonded to said inwardly facing layer and said outwardly facing layer, and said layers of said composite structure being helically wrapped about each other such that a successive layer overlaps a previous layer by about 15% to about 75% of the width of said previous layer.