Abstract: Composite fibrous products such as composite cloth, composite strings, composite knitted goods, etc., produced by using combination yarns obtained by twisting one or more aromatic polyamide continuous filament yarns and one or more continuous glass yarns have high rigidity and excellent reinforcing effects.

Abstract: A composite elongated-shaped product is made from two or more synthetic polymer components. The product may be a split-fiber, thread, film or a ribbon-shaped one. One of the polymer components is polypropylene which forms more than 50 percent by weight of the product. At least one other polymer component is distributed in the polypropylene. The composite product contains 65 to 95 percent by weight of polypropylene and 35 to 5 percent by weight of one or more polyesters and/or polyamides. The polyesters are built up of structural units derived from one or more dicarboxylic acids, at least 70 mole % of which are from terephthalic acid. Other structural units are derived from one or more low-molecular weight diols, at least 70 mole % of which are from a diol having the formula HO(CH.sub.2).sub.n OH, where n is a whole number and may be 2, 4 or 6. The polyamides are formed by polycondensation of caprolactam or adipic acid and hexamethylene-1,6-diamine.

Abstract: A high twist polyester multifilament yarn having a twist of a twist multiplier K within a range between 15,000 and 25,000, made from polyester filaments consisting essentially of a copolymer of two or more monomers selected from the group consisting of ethylene terephthalate, trimethylene terephthalate and tetramethylene terephthalate and/or a blend of two or more polymers of the respective monomers and having a breaking elongation of not more than 60% and a shrinkage in boiling water of not more than 6%. A woven or knitted crepe fabric obtained by employing such a high twist yarn has a desirable pebble configuration.

Abstract: The invention relates to a synthetic technical multifilament bicomponent yarn, which is particularly meant for use in safety belts, ropes and nets.The bicomponent yarn is preferably of the sheath-core type of which only the core contains a black pigment composed of carbon black particles and/or a reddish pigment composed of iron oxide particles and/or a whitish pigment composed of titanium dioxide particles of the rutil type, which pigments are insoluble in the polymeric material. The tenacity of the yarn may be about 70-85 cN/tex and the elongation at rupture of 7 to 15%.

Abstract: A composite multiple strand or filament twisted fishnet twine (11, 11') formed of synthetic material, methods for forming the same, and fishnets (10) formed therefrom, characterized in the use of a plurality of relatively fine, small diameter synthetic filaments (15.sub.a -15.sub.n) which may be on the order of 210 denier and which are twisted together in one of an "S" or a "Z" configuration to form a first multiple filament "B" strand (15) which is thereafter twisted with a plurality of relatively thick monofilament "A" strands (14.sub.a -14.sub.n) formed of synthetic material with either a "Z" or an "S" twist to form a coreless twine (11, 11') in which all of the "A" and "B" strands (14.sub.a -14.sub.n and 15) are of equal length per unit length of the twine (11, 11') and the individual fibers (14.sub.a -14.sub.n) and (15.sub.a -15.sub.n) are all exposed on the outer surface of the twine along substantially the entire lengths of the individual fibers.

Abstract: A twisted combination yarn is disclosed which is made of a first yarn which contracts when it absorbs water, and a second yarn plied with the first yarn which is not substantially changed in length by contact with water. The twisted combination yarn of the invention has a high water absorbing capacity, and contracts and becomes elastic when it absorbs water.

Abstract: A tire, particularly for aircraft, has a crown reinforcement formed of plies of circumferential cables having a relative extensibility upon rupture of at least 8%, preferably between 10% and 26%, when the vulcanized tire is mounted on its service rim but not yet inflated, and a relative contraction under the effect of the heat at the temperature of vulcanization of at least 1.25%, preferably between 2% and 8%.

Abstract: Coded threads and sheet material for making such threads useful in counterfeit-inhibiting garments. The sheet material comprises transparent microspheres, a specularly reflective layer underlying the microspheres, and a polymeric layer underlying the specularly reflective layer and containing particulate matter which may be varied from sheet material to sheet material to encode information and allow identification of the sheet material. The sheet material is split in narrow widths and incorporated into threads.

Abstract: A string for the stringing of rackets, bows, musical instruments and the like has a thread-like structure comprising at least one monofil of a synthetic resin mixture containing 99-86% by weight of polyvinylidene fluoride and 1-14% by weight of at least one polyacrylate. The monofil is melt-extruded and is stretch-oriented to impart improved elasticity thereto.

Abstract: A synthetic filament and a yarn composed thereof wherein the filament comprises at least two different incompatible synthetic linear high polymers, one being distributed as islands in the sea of the other polymer element when seen in cross-section, each island being continuous along the axis of the filament and being characterized by their uniformity in cross-sectional dimension in any cross-section of the filament.

Abstract: Anti-static polymeric films, fibers and textile yarn produced by process comprising admixing a branched chain, sulfur-containing polyester with a synthetic film- or fiber-forming polymer, extruding said film or textile fiber, and exposing said film or textile fiber to an aqueous solution containing a polyvalent metal ion reactive with the sulfate groups present in said sulfur-containing polyester. The sulfur-containing polyester is thereby fixed within the synthetic film or fiber and is resistant to extraction by water or commonly used dry cleaning solvents.

Abstract: A heat resistant fabric is provided, preferably woven, and with an optional aluminized backing, the fabric being made from yarns having a core of flame and high heat resistant non-melting heat stabilized polyacrylonitrile fibers covered by a layer of aramid fibers or other heat resisting fibers with or without blending with other fibers, the covering layer providing a cushion to provide increased abrasion resistance of the core while also providing a heat resistant covering for the core.

Abstract: A fabric suitable for use in making sandbags and the method of making the same wherein the fabric is woven from a yarn of twisted staple acrylic fibers having a fiber length of about 7 to 20 cm and a denier per filament of about 5 to 15, preferably 10 to 15, the yarn having a total denier of about 200 to 2650. The yarn is wrapped with a continuous filament yarn of a type which is degraded by ultraviolet light, with the wrapping being done in such a manner that fuzziness of the yarn is reduced to the point where the yarn can be woven into fabric without the use of size and at a weaving efficiency of at least about 70%.

Abstract: A bulky continuous filament yarn, in which continuous filament core yarns of polymeric material are substantially straight and free from loops and comprise from about 65 to about 93 percent of the total filaments by weight while the remainder of the total filaments are continuous filament effect yarns having a denier per filament of up to 5.0 that are inserted between the filaments of the core yarn and protrude from the surface of the core yarn in a mixture of crunodal and arch-like loops, is made by feeding a larger denier yarn at low overfeed and a much smaller denier yarn at low to moderate overfeed through a jet supplied with ambient air.

Abstract: Disclosed is a novel bulkable filamentary yarn of a flat yarn-like smooth appearance, said bulkable filamentary yarn is composed essentially of a bulkable portion and an interlaced portion existing alternately along the yarn length. Upon scouring, for example, said yarn develops its latent bulkiness similar to the fullness of silk, thus a silk-like appearance as well as a silk-like hand are provided in a fabric. The yarn itself can be obtained by heat-shrinking arc-like loops protruding on the yarn surface into a straightened state parallel to the yarn while the yarn is being tensioned along its length.

Abstract: Disclosed is a non-twisted, non-commingled, draw-textured, multi-colored yarn having enhanced luminosity and vibrancy of color. The yarn has a total denier of from 1000 to 4000 and is produced from 4 to 16 discrete component yarns of a particular coloration and/or dye receptivity which are longitudinally disposed in a side-by-side registration. Each component yarn has a denier of about 250 and is made up of a multiplicity of continuous filaments of 10 to 20 denier/filament, all of which have the same coloration and/or dye receptivity. There are from 2 to 8 different colorations or dye receptivities present in the yarn. However, there is no discernable predominance of a single coloration or dye receptivity in any longitudinal or transverse segment of the yarn. Moreover, fabrics prepared from this yarn do not possess undesirable patterns, streaks, or blotches of color.

Abstract: Disclosed is a bulky yarn made from a thermoplastic multifilament yarn. Each of the individual filaments forming the yarn has a randomly varying thermal shrinkage along its length. The filaments in the cross-section of the yarn also have randomly varying thermal shrinkages. The bulky yarn forms a plurality of loops having a stable and compact configuration, while the number of filament slack portions which project outwardly from the yarn surface is significantly decreased.A method for producing a bulky yarn possessing the above-mentioned construction is also disclosed. In the method, individual filaments forming the multifilament yarn are interlaced with each other, before or after which the yarn is subjected to a so-called random heat treatment. The interlaced and randomly heat-treated yarn is supplied at an over-feed condition to a fluid turbulent flow region which causes the individual filaments to form a plurality of loops and entanglements, and then the yarn is wound onto a package.

Abstract: A twist-free texturing feed yarn of drawn thermoplastic filaments is prepared from a bundle (A) of filaments having a melting point of 255.degree. to 275.degree. C. and a bundle (B) of filaments having a melting point above 230.degree. C. which is 15.degree. to 39.degree. C. lower than that of the filaments of bundle (A). The bundles differ in coloration or affinity for dyestuffs. The feed yarn is false-twist textured at a temperature 53.degree. to 78.degree. C. lower than the melting point of the filaments of bundle (A) to produce a textured yarn which provides a heather of high contrast and low directionality (no color streaks) in fabric made from the yarn. Filament compositions illustrated are poly(ethylene terephthalate) or poly[ethylene terephthalate/5-(sodium sulfo)isophthalate] or poly(hexamethylene adipamide) for bundle (A); and poly(ethylene terephthalate/glutarate) or poly(ethylene terephthalate/adipate) or poly(ethylene/2,2-dimethyl-1,3-propylene terephthalate) for bundle (B).

Abstract: An antistatic filament having a polymeric sheath and a conductive polymeric core of a defined nature, the core constituting less than 10% of the cross-sectional area of the filament.

Abstract: Disclosed are an improved islands-in-a-sea type multi-core composite filament comprising at least two different polymer components and having a cross-section wherein each island is surrounded by some other islands and most of the islands have an approximately quadrilateral to hexagonal cross-section, and also a process for producing the above-said composite filament.