Abstract: A multi-layered conjugated acrylic fiber comprises different acrylic polymers which are conjugated along the fiber axis in layers. On the average the fiber contains more than two layers of acrylic polymers. The shrinkage forming ratio in boiling water of the conjugated acrylic fiber is 7-15% and the shrinkage forming stress is 5-20 mg/denier. To make the acrylic fiber water absorbent, one or more of the acrylic polymers may contain 0.3 to 2.0 mmole/g of carboxylic acid groups. The fibers may be made by introducing the polymers into a static mixer in such a way as to retain a number of separate layers of the polymers, and thence to a spinneret through a filter having a maximum mesh space of 10 or more. After spinning out the dope, it is drawn, washed and dried. Except where water-absorbent fiber is wanted, this is followed by shrinkage forming treatment and redrawing; the water-absorbent fiber is treated with alkali solution either in the form of yarn, or a fabric made therfrom.

Abstract: Air-jet texturing with drawing, especially cold-drawing, or hot-drawing or other heat-treatments of spin-oriented crystalline polyester filaments, and particularly polyester feed yarns, that have been prepared by spinning at speeds of, e.g., 4 km/min, and have low shrinkage and no natural draw ratio in the conventional sense, provides useful technique for obtaining uniform drawn filaments of desired denier and thereby provides improved flexibility to obtain air-jet textured filaments and yarns of various denier. The resulting yarns have useful properties that are improved in certain respects.

Abstract: A process for the production of a porous organic material, in particular an organic semi-permeable membrane, provided with a plurality of separate passageways, comprising dissolving a polymer in a solvent, using a drawplate comprising needles having a shape conjugate with that of the passageways and external dimensions comprising between 0.7 and 1.2 times those of said passageways and an extrusion orifice of a conjugate fome to that of the extrudate and of internal dimensions comprising between 0.8 and 1.2 times those of said extrudate, injecting around the needles a solution having a viscosity greater than 500 millipascal-second, introducing into the interior of the conduits of the drawplate a centering fluid which is a non-solvent with respect to the polymer and able to precipitate the polymeric solution, causing the extrudate to travel from the output of the drawplate a distance da in a gaseous atmosphere which is non-precipitating with respect to the polymeric solution such that 500.times.e<da<0.

Abstract: A method of joining the ends of a papermakers fabric wherein machine direction yarns are fringed out at the fabric ends, yarn ends being laid across a pinned plate, and yarn ends being cut back so as partially to overlie the plate. Those yarns which extend across the plate are folded back to form loops beyond the edge of the plate and a thermoplastics matrix material is applied to the plate. The matrix material is made fluid by heating and, on subsequent cooling, forms an apertured end to the fabric which presents side-by-side, outwardly extending loops. The loops at the respective fabric ends may be interdigited to receive a pintle wire, thus to bring the fabric into endless form.

Abstract: A process for the preparation of substantially polycrystalline silicon carbide fibers are provided. The fibers may be fabricated to have a small diameter and are thermally stable at high temperature. The process is carried out by initially forming fibers from a preceramic polymeric precursor comprising phenyl-containing polyorganosiloxane resins. The fibers are then infusibilized to render them nonmelting followed by a pyrolysis step in which the fibers are heated to a temperature in excess of 1600.degree. C. in a nonoxidizing atmosphere to form substantially polycrystalline silicon carbide fibers. The substantially polycrystalline silicon carbide fibers which are formed have at least 75% crystallinity and have a density of at least about 2.9 gm/cm.sup.3. The polymeric precursor or the fibers contain, or have incorporated therein, at least about 0.2 % by weight boron.

Abstract: Pulps and short fibers containing polybenzoxazole and/or polybenzothiazole or copolymers thereof can be synthesized by freezing the wet fiber straight from the coagulation bath without drying, and chopping or grinding the frozen fiber to the desired size and degree of fibrillation.

Abstract: A method for extruding a wide variety of plural-component fiber configurations in a spin pack utilizes one or more disposable distributor plates in which distributor flow paths are etched on one or both sides to distribute the polymer components to appropriate spinneret inlet hole locations. The etching process permits the distribution paths to be sufficiently small to facilitate issuing multiple discrete polymer component streams axially into each spinneret orifice inlet hole, whereby the resulting extruded fiber can be made up of at least one hundred side-by-side sub-fibers. If the adjacent sub-fibers are weakly bonded, they can be readily separated by agitation to significantly increase the effective yield from the spin pack and provide very fine and uniform fibers.

Abstract: A solderless twist on wire connector and a method of making a solderless twist on wire junction encapsulating twist on wire connector by securing a prior art twist on wire connector in a shell to produce a wire junction encapsulating twist on wire connector that can in one operation permit the user to twist the connector to simultaneously compress the junction ends of electrical wires into low resistance electrical contact while encapsulating the junction ends of the electrical wires in a solderless substance. The process includes the method making a twist on wire connector by encapsulating a prior art twist on wire connector in a shell to produce a wire junction encapsulating twist on wire connector having a chamber for an encapsulating material. In one embodiment the twist on wire junction encapsulating twist on wire connector includes a puncturable seal and in another embodiment a second compartment for holding a mixable encapsulating materials.

Abstract: A method for producing a melt-blown non-woven mat wherein a fiber-forming thermoplastic polymer resin is extruded in molten form through a row of nozzles into a stream of hot gas which attenuates the molten resin into fibers that form a fiber stream. The fibers are collected on a receiver in the path of the fiber stream to form the non-woven mat. At least two spaced rows of nozzles are provided to produce first and second fiber streams spaced from each other. The spaced fiber streams are collected on the receiver to form a first non-woven mat portion and a second non-woven mat portion and with the first non-woven mat portion overlaying the second non-woven mat portion. At a position intermediate the first and second fiber streams, material different than the fiber-forming resin is injected to have the different material captured between the first and second fiber streams and thereby form a collected structure of the first and second mat portions sandwiching the different material.

Abstract: A resin material is fed into a cavity of a mold provided with a movable member adapted to form a tear-line on the resin material and capable of moving toward, and away from, the mold cavity such that when the mold cavity is filled with the resin material and the mold is closed, the movable member is advanced toward the mold cavity thereby obtaining a modular cover provided with a tear-line having a small thickness and a high degree of strength.

Abstract: Ultra-oriented, crystalline synthetic filaments with high tenacity are produced by extrusion of a fiber-forming synthetic polymer melt into a liquid isothermal bath maintained at a temperature of at least 30.degree. C. above the glass transition temperature of the polymer, withdrawing the filaments from the bath and then winding up the filaments. Polyethylene terephthalate filaments so produced at 3000-5000 m/min exhibit a crystalline structure and possess birefringence of 0.20-0.22, tenacity of 7-9 g/d, break elongation of 14%-30% and boil-off shrinkage of 5%-10%.

Abstract: A method of impregnating electric machinery (32) containing windings with a resin (46) in accordance with the invention includes providing a vessel (30) for containing the electric machinery and an impreganting resin with the vessel having an interior volume (40) in contact with an exterior surface (42) of the electric machinery to be contacted with resin to impregnate the windings; heating the vessel containing the electric machinery to a temperature sufficient to reduce viscosity of the resin upon contact with the machinery to promote flow of resin into contact with the windings; contacting the heated vessel and electric machinery with the resin with the heated electric machinery reducing the viscosity of the resin with the reduced viscosity resin flowing into contact with the windings to be impregnated; curing the resin within the vessel to cause the resin to be retained in contact with the windings and removing the electric machinery from the vessel.

Abstract: A method for producing a lid device for a wide-mouthed container which comprises a lid body having an opening of a predetermined shape, and a closure member made of a soft synthetic resin for closing the opening of the lid body. According to the method, the lid body and a vapor impervious film are placed between a first mold body and a second mold body with the film located on the side of the second mold body. The first mold body has a closure forming cavity, whereas the second mold body has a tab forming cavity. A fluid synthetic resin is injected under pressure from the side of the first mold body to fill the closure forming cavity. The resin is caused to break through the film to fill the tab forming cavity, thereby forming a pull tab integral with the closure member.

Abstract: An improved process is provided for flash-spinning plexifilamentary film-fibril strands of a fiber-forming polyolefin from a C.sub.4-7 hydrocarbon/co-solvent spin liquid that, if released to the atmosphere, presents a greatly reduced ozone depletion hazard, as compared to the halocarbon spin liquids currently-used commercially for making such strands. The resulting plexifilamentary film-fibril strands have increased tenacity and improved fibrillation compared to strands flash-spun from 100% hydrocarbon spin liquids.

Abstract: Drawing, especially cold-drawing, or hot-drawing or other heat-treatments of spin-oriented crystalline polyester filaments, and particularly polyester feed yarns, that have been prepared by spinning at speeds of, e.g., 4 km/min, and have low shrinkage and no natural draw ratio in the conventional sense, provides useful technique for obtaining uniform drawn filaments of desired denier and thereby provides improved flexibility to obtain filaments and yarns of various sub-deniers.

Abstract: Processes for manufacturing in an environmentally friendly way, continuous, supported ion exchange membranes from (I) liquids containing vinyl and related monomeric electrolytes and high boiling solvents, the solvents also being swelling agents for the membranes; and (II) an indefinitely long, foraminous substrate.

Abstract: A process is provided for the preparation of a pitch-based carbon fiber having a microstructure consisting of strip-like structural units extended in the longitudinal direction of the fiber, wherein the fractal dimension D of the arrangement of the strip-like structural units in the cross-section of the fiber has a fractal structure satisfying the requirement of the following formula (2) relatively to the observation scale r satisfying the requirement of the following formula (1) with respect to the cross-section of the fiber:E/2.5>r>E/25 (1)2.0>D>1.05 (2)wherein E in the formula (1) stands for a smallest principal radius of gyration of cross-sectional area of the cross-section of the fiber.

Abstract: Water-dispersible polyester fiber whose water-dispersibility is improved, and precursor filament tow are prepared by an improved process involving treatment of undrawn polyester filaments with a very small amount of caustic, when freshly-extruded, in a spin-finish.

Abstract: An injection molding method for a multi-layer bottomed parison comprising: using a triple nozzle concentrically comprising a first flowpassage in communication with a nozzle hole, a second flowpassage and a third flowpassage respectively opening to a distal end of the first flowpassage in the inside of the nozzle hole, forming an inner layer and an outer layer of a bottomed parison with a resin from the first flowpassage, and forming a bottomed parison having a five-layer or a four-layer in section comprising an intermediate layer and a center layer or two intermediate layers with resins from the second flowpassage and the third flowpassage.

Abstract: An improved melt spinning process for preparing nylon filaments wherein the freshly-extruded filaments enter an enclosed zone that is maintained at superatmospheric pressure by a controlled flow of air at low positive pressure and the filaments leave the zone through a constriction, either a venturi or a tube, assisted by the cocurrent flow of such air at a high controlled velocity.