Abstract: A rope assembly comprises a central rope, which may be composed of nylon, a plurality of flotation elements of closed cell form and buffer elements of open cell form which are disposed between and flush with the flotation elements. A protective layer, which may be formed of polyurethane, surrounds the rope and the flotation and buffer elements. The closed cell form elements may be polyethylene. The open cell form elements may be polyurethane.

Abstract: A mop head has a fitting, a coupler, and string. The fitting couples to the end of a handle. The coupler attaches the string to the fitting. The string is arranged in multiple loops that depend from the fitting. The string itself is made of a foam core and a protective filament covering. The foam is of the open cell type for absorbency and wringability. The filament is braided or knitted so as to completely encircle the core and to provide openings therethrough in order to allow access to the core. The covering protects the core from tearing and other mechanical damage, while maintaining the porosity of the overall string.

Abstract: Disclosed herein is a method for preparing carbon fiber reinforced carbon composites comprising:subjecting short fibers composed of bundles of multiple single fibers to dry or wet fibrillation;preparing a sheet oriented in the two-dimensional random direction; andafter impregnating the obtained sheet with resins pitches and laminating the sheet followed by molding, subjecting the molded product to baking and densification treatments.

Abstract: The present invention provides high strength fiber of polytetrafluoroethylene (PTFE) having a strength of at least 0.5 GPa, which is manufactured by forming a monofilament of PTFE group polymer by paste extrusion, free end annealing the monofilament, and subsequently drawing the annealed monofilament to form the fiber, wherein PTFE molecular chains are oriented in a direction parallel to an axial direction of the fiber.

Abstract: The present invention provides improved compositions of expanded polytetrafluoroethylene (PTFE) and similar polymers and methods for forming and using such compositions. In its preferred embodiment, the present invention employs a mixture of PTFE and expandable thermoplastic microspheres. Through application of an energy source to the mixture, a coherent three dimensional expansion of PTFE can be achieved. The expanded mixture has many of the same beneficial properties of mechanically expanded PTFE and numerous properties previously unavailable with expanded PTFE products.

Abstract: This invention provides for a continuous PTFE fiber having on its surface a substantially round profile and a single spiralling seam formed from a continuous sheet of polytetrafluoroethylene which is helically rolled and self-adhered. The PTFE sheet may include microporous PTFE as well as expanded microporous PTFE. The PTFE sheet may be filled with particulate fillers or coated with polymeric coatings prior to the formation of the inventive fiber. The PTFE sheet may be used to contain various filamentary or sheet-like elements with the inventive fiber.The method for producing the inventive fiber is also disclosed.

Abstract: Reinforcing fibres made from polyolefin and polyolefin derivatives, the fibres having a thickness of 10-100 .mu.m and containing inorganic particles of a size of 1-10 .mu.m in an amount of at least 12% by weight, calculated on the total fibre weight, the particles being embedded in the polyolefin or polyolefin derivative, substantially none of the particles being exposed at fibre surfaces. The inorganic particles are preferably chalk or barium sulphate. The fibres are prepared from a fibrillated, stretched, blown or cast film, which may have been subjected to a surface treatment such as a corona treatment or application of avivage. The reinforcing fibers are useful in composite materials comprising an inorganic binder such as cement and puzzolane.

Abstract: The present invention uses, as a base material, a multi-layer film comprising more than two layers and formed from thermoplastic resins different in melting point from one another. A sectional construction of the multi-layer film or a tape obtained from the multi-layer film is applied to a sectional construction of a fibre without modification, the multi-layer film or tape being formed into the fibre. The invention provides a composite fibre which is much more excellent as compared to a conventional heat adhesive composite fibre by melt spinning, a water-absorbing material using the composite fibre as a base material and a method for the production of the same by the stated simple means.

Abstract: A yarn article comprising a tetrafluoroethylene polymer is disclosed which has a specific bulk density, a specific orientation degree in an axial direction and a specific crystallinity and exhibits specific peaks in the thermogram of differential scanning calorimetry. The yarn article has excellent tensile strength at break and excellent tensile modulus of elasticity as well as inertness to chemicals. Therefore, the yarn article of the present invention can advantageously be used as a material for producing a woven fabric, a knit, a rope and the like, particularly in the field where not only chemical resistance but also high tensile strength and high tensile modulus of elasticity are required.

Abstract: The present invention pertains to a process and product thereof, and an apparatus, for converting a twisted, continuous filament, multifilament yarn into a staple-like yarn. The process is carried out by needling the yarn with a barbed needle in order to break yarn filaments. The broken yarn filaments protrude from the yarn after the needling process. The protruding filament ends give the resulting yarn the appearance of a spun yarn.

Abstract: The present invention relates to a composite yarn product, having improved strength and resistance to distortion and fracture in use, in combination with improved texture and appearance. The composite yarn product comprises strands of a composite resin laminate prepared from at least three film layers, with a centrally colored substrate prepared from a synthetic resin film, and paired outer films individually formed and adhesively attached to the substrate by heat and pressure. The film layers are bonded together by an adhesive composition. The adhesive composition comprises a first component and a second component, the first component including a resin material selected from acrylonitrile-butadiene copolymers, and butadiene-styrene copolymers. The first component is prepared in an organic solvent system. The second component contains an epoxy resin such as a bisphenol A-derived diepoxide, and a vinylchloride-vinylacetate copolymer, prepared in a like organic solvent system.

Abstract: A composite comprising a matrix resin reinforced with a sliver of high modulus p-aramid fibers of which at least 10% of the fiber ends are fibrillated into at least 2 fibrils along a terminal length which is at least 5 times as long as the diameter of the unfibrillated portion of the fiber.

Abstract: The present invention relates to an adhesive for use in the manufacture of a composite yarn product, that results in the preparation of a product having improved strength and resistance to distortion and fracture in use, in combination with improved texture and appearance. The adhesive composition comprises a first component and a second component, the first component including a resin material selected from acrylonitrile-butadiene copolymers, and butadiene-styrene copolymers. The first component is prepared in an organic solvent system. The second component contains an epoxy resin such as a bisphenol A-derived diepoxide, and a vinylchloride-vinylacetate copolymer, prepared in a like organic solvent system.The adhesive composition is prepared by the individual mixture of the respective components followed by the addition of the first component to the second component under agitation.

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: High strength, high modulus, continuous filament aromatic polyamide yarns are stretch broken under high tension while being sharply deflected in a lateral direction by mechanical means to provide a sliver which is processed by conventional means to a high strength, high modulus spun yarn. The broken ends of the fibers are highly fibrillated to fibrils having lengths of 50-350 times the diameter of the unfibrillated portion of each fiber.

Abstract: An improved synthetic twine and method of manufacturing same are disclosed. The synthetic twine comprises at least one longitudinally extending oriented synthetic ribbon which has been fibrillated to provide a net-like structure having fine fibril stems connected by finer fibril branches, and a synthetic binder in thin band form made of a material compatible with the synthetic ribbon. The synthetic binder is spirally wrapped around and fused to the synthetic ribbon. The method of making a twine comprises the steps of providing at least one longitudinally extending ribbon, orienting the synthetic ribbon and fibrillating the synthetic ribbon to provide a net-like structure having fine fibril stems connected by finer fibril branches. Thereafter, a synthetic binder in thin bank form is spirally wrapped and fused around the synthetic ribbon which has been oriented and fibrillated.

Abstract: The simulated grass pile fabric of this invention is of the woven or warp knit type and is characterized by having a dense pile surface defining a playing surface on which a playing ball will roll substantially equally free in all directions and will bounce substantially equally true in all directions, and the pile surface is formed of textured multifilament pile yarns of a yarn size greater than 4500 denier interlaced with a base of synthetic warp and filling yarns, wherein the warp yarns are of a yarn size in the range of about 1300 to 2200 denier and the filling yarns are fibrillated monofilament yarns of a yarn size in the range of about 2200 to 4400 denier.

Abstract: Spunlike yarns having free ends are made from continuous filament yarn by fluid-jet texturing. The fibrous elements that make up the yarn have irregular and varying cross-sectional shapes, said fibrous elements being forked and merged in a fortuitous manner. The spunlike yarns may also contain fibrous elements that extend substantially continuously throughout the length of the yarn.

Abstract: Methods of making network structures include forming on one side of a sheet of thermoplastic polymer a plurality of parallel continuous main ribs and forming on the other side of the sheet in a different direction a plurality of parallel discontinuous tie ribs. The tie ribs are discontinuous in the areas where they cross over the main ribs to eliminate any increased thickness at the cross-over points of the main ribs and tie ribs. The ribbed sheet thus formed is drawn in either one direction or in two preferably perpendicular directions to open the sheet into a network structure and to orient the main ribs and preferably also to orient the tie ribs.

Abstract: A low denier, high tenacity poly(ethylene terephthalate) fibrillated tape yarn particularly suited for conversion into a sewing thread which exhibits excellent sewing performance is produced by intimately mixing poly(ethylene terephthalate) polymer with from about 0.1 to 20 percent polypropylene based on the weight of poly(ethylene terephthalate), extruding the polymer mixture in the form of a tape through a slit die having a modified entry port wherein the depth of the slit is greater at both ends than at the middle, at a melt draw down of from about 26:1 to about 75:1, quenching said tape, hot drawing said tape in two stages wherein said tape is initially hot drawn to a draw ratio of from about 3.3 to about 4.2 while being subjected to a temperature of from about 80 to about 140 degree centigrade, thereafter hot drawing to a total draw ratio of about 5.0 while heated to a temperature about 160 degrees and thereafter subjecting the tape to fibrillation.

Abstract: A corrosion resistant rope in which the individual strands are sealed with a plastic foam impregnant and which exhibits excellent retention of lubrication is made by preimpregnating the outer strands of the rope with plastic foam material prior to closing the strands into a wire rope. The final rope may then be surface lubricated to provide temporary and long term corrosion resistance and lubrication to exposed surface wires.