摘要:
Poly(p-phenyleneterephthalamide) yarn of improved fatigue resistance is prepared by spinning the polymer in sulfuric acid through an air gap into an aqueous coagulating bath to produce a coagulated yarn, maintaining the coagulating bath at a temperature of at least 20.degree. C., washing and neutralizing the yarn while it is under a tension of from 0.2 to 0.4 grams per denier, and drying the yarn at a temperature below 200.degree. C. while it is maintained under a tension of 0.05 to 0.2 grams per denier.
摘要:
The invention concerns multiaxial fabrics comprising a first layer comprising a plurality of first yarns being substantially parallel in a first direction; a second layer comprising a plurality of second yarns being substantially parallel in a second direction and skew of off-set with respect to the first yarns; a third yarn layer comprising a plurality of third yarns being substantially parallel in a third direction and skew of off-set with respect to the first yarns and second yarns; a fourth yarn layer comprising a plurality of fourth yarns being substantially parallel in a fourth direction and skew of off-set with respect to the first, second and third yarns; at least one fiber network layer; and a transverse yarn interlaced transversely within the multiaxial fabric where each layer may be arranged in any sequential order and optionally coated with a high viscosity polymer that has a glass transition temperature Tg in the range of about −40 to about 0° C., and a zero shear melt viscosity of about 2×106 to about 1013 poise at 20° C.
摘要:
This invention pertains to an article for use in body armor, comprising a plurality of discrete sheet subassemblies contoured to the shape of a female breast arranged in a stack, without bonding, such that the breast contours are positioned on top of each other, each of the subassemblies comprising at least two nonwoven layers of high tenacity yarns such as par-aramid, a binder and a resin.
摘要:
A subassembly useful in a ballistic armor article comprises a first layer comprising a plurality of first yarns of continuous filaments, said first yarns being substantially parallel in a first direction; a second layer adjacent to and in contact with said first layer and comprising a plurality of second yarns of continuous filaments, said second yarns being substantially parallel in a second direction skew with respect to the first direction wherein the first and second yarns comprise para-aramid yarns having a tenacity of at least 25 grams per dtex and an elongation at break of from 3.6 to 4.5 percent.
摘要:
The invention concerns multiaxial fabrics comprising a first layer comprising a plurality of first yarns being substantially parallel in a first direction, a second layer comprising a plurality of second yarns being substantially parallel in a second direction and skew or off-set with respect to the first yarns, transverse yarn interlaced transversely within the layers; wherein each layer is coated with a high viscosity polymer that has a Tg in the range of about −40 to about 0° C., and a zero shear viscosity of about 2×106 to about 1013 poise at 20° C.
摘要:
Provided is a multiaxial fabric comprising a first layer comprising a first layer comprising substantially parallel resin-free polyethylene yarns oriented in a first direction; a second layer comprising substantially parallel resin-free polyethylene oriented in a second direction, the first and second directions being skew with respect to each other; a layer, interposed between and in contact with each of the first and second layers, and comprising a thermoplastic or thermoset film; and a yarn interlaced transversely among each of the layers of the multiaxial fabric.
摘要:
Provided are non-woven constructions and fabrics comprising polypyridazole short fiber; the short fiber characterized by an average filament tenacity of at least 15 grams per denier; an average filament modulus of at least 500 grams per denier; an average filament density of at least 1.6 grams per cubic centimeter; an average filament length of 30 to 100 millimeters; and an average filament denier per filament of 0.1 to 10; wherein the construction is substantially free of matrix.
摘要:
A process of treating a woven fabric by applying to the fabric a viscous polymer in a 5 to 40 wt % solution with a solvent, wherein the polymer has a Tg in the range of about minus 40 to about 0° C. and a zero shear melt viscosity of about 2×106 to about 1013 poise when measured at 20° C. and then evaporating the solvent such that the polymer only partially penetrates the fabric and penetrates to in and between fiber bundles before the polymer solidifies.
摘要:
The invention relates to a flexible, penetration resistant article comprising a plurality of fibrous layers including continuous filament yarns, and having an areal density of less than about 4.4 kilograms per square meter. At least one of the plurality of fibrous layers has a fiber with a tenacity of at least about 30 grams per decitex and a continuous filament yarn having a linear density of less than about 1100 decitex.
摘要:
The present invention relates to penetration resistant life protection articles, including spike penetration resistant life protection articles, and preferably spike and ballistic projectile penetration resistant life protection articles.