Bi-directional and multi-axial fabric and fabric composites
First Claim
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1. A knitted fabric comprising:
- a) a first set of continuous filament unidirectional yarns lying in a first plane;
b) a second set of continuous filament unidirectional yarns lying in a second plane above said first plane and arranged transversely to said first set of yarns; and
c) a third set of yarns forming interlocking loops interlaced with said first and said second set of yarns, each yarn of the third set lying above some and below the remaining yarns of said first and said second sets of yarns;
wherein the yarns of each of said first and said second sets have tenacity'"'"'s equal to or greater than about 15 g/d, initial tensile moduli equal to or greater than about 400 g/d and energies-to-break equal to or greater than about 22 J/g, as measured by ASTM D2256; and
wherein the yarns of each of said first and said second sets, in proportion to the yarns comprising said third set of yarns, have at least twice the breaking strength and one half the elongation to break.
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Abstract
Bi-directional and multi-axial fabrics, fabric composites, ballistically resistant assemblies thereof, and the methods by which they are made. The fabrics are comprised of sets of strong, substantially parallel, unidirectional yarns lying in parallel planes, one above the other , with the direction of the yarns in a given plane rotated at an angle to the direction of the yarns in adjacent planes; and one or more sets of yarns having lower strength and higher elongation interleaved with the strong yarns.
The fabrics of the invention provide superior ballistic effectiveness compared to ordinary woven and knitted fabrics but retain the ease of manufacture on conventional looms and knitting machines.
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13 Claims
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1. A knitted fabric comprising:
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a) a first set of continuous filament unidirectional yarns lying in a first plane; b) a second set of continuous filament unidirectional yarns lying in a second plane above said first plane and arranged transversely to said first set of yarns; and c) a third set of yarns forming interlocking loops interlaced with said first and said second set of yarns, each yarn of the third set lying above some and below the remaining yarns of said first and said second sets of yarns; wherein the yarns of each of said first and said second sets have tenacity'"'"'s equal to or greater than about 15 g/d, initial tensile moduli equal to or greater than about 400 g/d and energies-to-break equal to or greater than about 22 J/g, as measured by ASTM D2256; and wherein the yarns of each of said first and said second sets, in proportion to the yarns comprising said third set of yarns, have at least twice the breaking strength and one half the elongation to break. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification