Multidirectional fiber-reinforced tape/film articles and the method of making the same
View Patent ↗High tenacity, high elongation multi-filament polymeric tapes as well as ballistic resistant fabrics, composites and articles made therefrom. The tapes are fabricated from multi-filament fibers/yarns that are twisted together, bonded together, compressed and flattened.
1. A polymeric tape comprising a flattened multi-filament yarn, said yarn comprising a plurality of continuous polymeric filaments that are twisted together and bonded together; wherein said tape has an ultimate tensile strength of at least 15 g/denier and wherein the value of the ultimate tensile strength (g/denier) of the tape multiplied by the ultimate elongation (%) of the tape is at least 150.
2. The polymeric tape of claim 1 wherein the tape comprises polyethylene filaments and has an ultimate tensile strength of at least 20 g/denier.
3. The polymeric tape of claim 1 wherein said tape has an ultimate elongation of at least 5.0%.
4. The polymeric tape of claim 1 wherein the tape has an average cross-sectional aspect ratio of at least about 10:1.
5. The polymeric tape of claim 1 wherein said plurality of continuous polymeric filaments are twisted together with at least about 3 twists per inch of yarn length and less than about 11 twists per inch of yarn length.
6. The polymeric tape of claim 1 wherein the tape comprises at least 95% by weight of ultra-high molecular weight polyethylene filaments.
7. A polymeric tape comprising a flattened multi-filament yarn, said yarn comprising a plurality of continuous polymeric filaments that are twisted together and bonded together; wherein said tape has an ultimate elongation (y) (%) and an ultimate tensile strength (x) (g/denier) that are proportional to each other and conform to the relationship y=−0.04x+b, where b=5 or greater and x is 15 or greater.
8. The polymeric tape of claim 7 wherein b is 5 to 15.
9. The polymeric tape of claim 7 wherein x is at least 20 (g/denier) and b is 5 to 15.
10. A woven fabric formed from a plurality of the polymeric tapes of claim 7 .