摘要:
An improved article of the type comprising one or more flexible fibrous layers wherein the fibers in each layer are arranged parallel or substantially parallel to one another along a common fiber direction with fibers in adjacent layers aligned at an angle with respect to the longitudinal fiber axis of the fibers contained in the layers.
摘要:
Ultrahigh molecular weight polyethylene fibers of high tenacity and modulus shrink controlled amounts at temperatures in the range of 100.degree.-155.degree. C. Fabrics and twisted multifilament yarns of these fibers are heat-shrunk or heat-set at these temperatures.
摘要:
The present invention is an improved prepreg layer, multilayer composite based on the improved prepreg layer, and article made from the multilayer composite.The prepreg layer of the present invention comprises an array of at least two adjacent, coplanar fibrous elements. Each element comprises a plurality of unidirectional coplanar fibers embedded in a polymeric matrix. The fibers are up to eight inches, preferably one to eight inches, and more preferably two to six inches long.The prepreg layer of the present invention is useful to make a multilayer composite comprising a plurality of the prepreg layers as recited above. The fibers of adjacent layers are at an angle of about 90.degree. from each other. The composite preferably has 2 to 500, more preferably 10 to 150, and most preferably 60 to 120 layers.
摘要:
The present invention provides an improved fabric which comprises at least one network of fibers selected from the group consisting of extended chain polyethylene (ECPE) extended chain polypropylene (ECPP) fibers, extended chain polyvinyl alcohol fibers and extended chain polyacrylonitrile fibers. A low modulus elastomeric material, which has a tensile modulus of less than about 6,000 psi, measured at about 23.degree. C., substantially coats the fibers of the network. Preferably, the fibers have a tensile modulus of at least about 500 grams/denier and an energy-to-break of at least about 22 Joules/gram.
摘要:
The present invention provides an improved, ballistic-resistant composite article of manufacture which comprises a network of high strength fibers having a tensile modulus of at least about 500 grams/denier and an energy-to-break of at least about 22 Joules/gram. An elastomeric matrix material substantially coats each of the individual fibers, and has a tensile modulus of less than about 6,000 psi, measured at 25.degree. C.
摘要:
Partially unsaturated polymers are dissolved in a two component solvent comprising a first component having a reactivity toward ozone less than carbon-carbon double bonds but more reactive than carbon-carbon single bonds and a second component being inert toward ozone. Introduction of ozone into the solution produces ozonides which are readily cleft into difunctional aliphatic species that can be converted to e.g. carboxy-terminated or multifunctional carboxy substituted aliphatic compounds. These may be used as monomeric species in various polymerization schemes as such, in preparation of polyamides, for example, or may be reduced to aldehydes or alcohols to be used in the preparation of such polymers as polyesters, polyurethanes, poly (Schiff bases), etc. The carboxylated products may also be employed as ionomers, which are useful as surfactants. Monocarboxyl terminated polyethylene having a number average molecular weight of from about 4,000 to 100,000 are provided. Poly(carboxymethyl) substituted polyethylenes, wherein from about 0.05 to 1.3 percent of the hydrogen atom or polyethylene are substituted with carboxymethyl groups, are obtained.
摘要:
A refrigeration system for a disk drive storage is provided. The refrigeration system employs pairs of thin conducting plates, each pair of which is placed so as to sandwich a disk drive. The refrigeration system conducts heat generated from the disk drives via the thin conducting plates, heat pipes coupled to the thin conducting plates, a back plate and a chilled manifold. The heat is further removed as a refrigerant travels through to a compressor and then to a condenser, both of which are connected to the chilled manifold. In this way, the disk drive storage is able to increase its capacity from a bank of twelve disk drives to fourteen disk drives for a 1 inch disk drive storage and from eight disk drives to nine disk drives for a 1.6 inch disk drive storage system, thereby realizing an increased density system without sacrificing a low operating temperature.
摘要:
An improved flexible composite of manufacture especially suitable for use as a ballistic resistant body armor, said improved penetration resistant composite of the type comprising at least one penetration resistant layer comprising a flexible substrate having a plurality of penetration resistant elements on a surface thereof, said elements comprising a planar body having one or more fibrous layers on a surface of said body, each of said layers comprising a fiber network, said fiber network such that movement of said fibers in the direction of the edges of said body is restrained.
摘要:
A flexible article of manufacture especially suitable for use as a ballistic resistant body armor which comprises at least one substrate, said layers being a fibrous layer, and at least one layer having a plurality of metallic bodies sewn to at least one surface of said substrate layer.
摘要:
A coated web or composite having improved flexibility. The coated web of the present invention comprises at least one layer and preferably at least two layers. The layers comprise a fibrous web located or embedded with polymeric composition. The coated web is flexed sufficiently over at least a portion of the web surface to have improved flexibility properties. The web can be flexed in a single direction along the surface or randomly along the whole surface. Preferably, the web is flexed sufficiently to form a plurality of permanent creases or wrinkles. The coated web has improved flexibility, and at the same time, impact resistant properties, such as ballistic resistance, are substantially maintained compared to an unflexed web.