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US 2019/0240952 A1Published application
Low porosity high strength uhmwpe fabrics
AssigneeHoneywell International Inc.
InventorsASHOK BHATNAGAR, HUY XUAN NGUYEN, LORI L. WAGNER
Life of this patent
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Abstract
Low porosity fibrous materials, articles formed therefrom and processes for their formation. Multiple plies of high tenacity, multifilament elongate bodies are optionally stitched together and pressed as a set without being laminated, adhered or thermally fused to each other. Pressing spreads the component filaments of the elongate bodies, forcing the filaments to occupy spaces between adjacent fibers and thereby reducing porosity of the complete multi-ply material.
Claims20
A fibrous material comprising:
- a first fibrous ply comprising a plurality of first multifilament elongate bodies, wherein immediately adjacent bodies of said first multifilament elongate bodies are not connected, bonded or fused to each other such that they are not constrained relative to each other and are able to move freely within the first fibrous ply, each of said first multifilament elongate bodies having a tenacity of at least about 7 g/denier and an initial tensile modulus of at least about 150 g/denier;
- a second fibrous ply on and coextensive with said first fibrous ply, said second fibrous ply comprising a plurality of second multifilament elongate bodies, wherein immediately adjacent bodies of said first multifilament elongate bodies are not connected, bonded or fused to each other such that they are not constrained relative to each other and are able to move freely within the second fibrous ply, each of said second multifilament fibers having a tenacity of at least about 7 g/denier and an initial tensile modulus of at least about 150 g/denier;
- wherein said first fibrous ply and said second fibrous ply are not laminated to each other, adhesively bonded to each other with an adhesive, or thermally fused to each other.
(canceled)
A process for forming a fibrous material, the process comprising:
- a) providing a first fibrous ply comprising a plurality of first multifilament elongate bodies arranged in a planar, parallel array, each of said first multifilament elongate bodies having a tenacity of at least about 7 g/denier and an initial tensile modulus of at least about 150 g/denier;
- b) providing a second fibrous ply comprising a plurality of second multifilament elongate bodies arranged in a planar, parallel array, each of said second multifilament elongate bodies having a tenacity of at least about 7 g/denier and an initial tensile modulus of at least about 150 g/denier;
- c) positioning the first fibrous ply coextensively with the second fibrous ply and then optionally mechanically attaching the first fibrous ply and the second fibrous ply to each other, thereby forming a set of plies;
- d) thereafter, heating the set of plies to a temperature of from about 270° F. (132.2° C.) to about 302° F. (150.0° C.) and pressing the set of plies together in a press either simultaneously with or subsequent to said heating at a pressure below 500 psi (about 3447 kPa), thereby causing the filaments of said multifilament elongate bodies to spread apart whereby longitudinal edges of adjacent multifilament elongate bodies in each respective fibrous ply are brought into contact with each other;
- and
- e) optionally allowing the heated set of plies to cool, wherein said first fibrous ply and said second fibrous ply are not laminated, adhered or thermally fused to each other.
3 more elements
A reinforced fabric consisting essentially of:
- (I) a single non-woven fibrous ply comprising unidirectionally oriented, high tenacity elongate bodies;
- or
- a single non-woven fibrous ply comprising a plurality of randomly oriented staple fibers;
- or
- a single woven fibrous ply comprising a plurality of high tenacity warp elongate bodies interwoven with a plurality of transversely disposed high tenacity weft elongate bodies;
- and
- II) at least a first set of threads mechanically placed through and reinforcing said single fibrous ply of (I), said first set of threads comprising a plurality of third elongate bodies and forming a plurality of stitches, wherein a plurality of elongate bodies or staple fibers are positioned within each stitch.
4 more elements
Dependencies are inferred from the claim text.