Abstract: There is provided an improved molding resin capable of being molded into an article exhibiting reduced tendency to corrode a copper surface when the molded resin and the copper surface are placed in spaced relationship in a common unventilated atmosphere at elevated temperatures, as measured by the Bell Telephone Laboratories Copper Corrosion Test at temperatures within the range of from 150.degree. to 175.degree. C., wherein the molding resin comprises the combination of (a) a poly(butylene terephthalate) based polymer and aromatic halogen groups in a flame retardant amount, and (b) an alkylhydroxyphenylalkanoyl-hydrazine in an amount that is within the range of from 0.05 to 0.6% by weight, based on the weight of the molding resin, and less than 0.8% by weight based on the polymer.

Abstract: Sintered bauxite particles having defined physical and chemical properties are disclosed as being surprisingly eminently suitable as filtration media for molten polymer, such as polyester polymer. Broadly, the particles have a roundness of at least 0.8, and an API standard mesh size of at least 12; in addition, such particles inherently contain significant amounts of ferric oxide. It is preferred that the sintered bauxite particles (i) be microcrystalline, and therefore sintered under critical conditions; (ii) exhibit high crush strength; (iii) be compaction and fracture resistant up to pressures of 6000 psi by defined permeability tests; and (iv) have an API standard mesh size not greater than 70. Also, the sintered particles may have a microporous internal structure and surface.Also disclosed is an improved annular melt-spinning pack, including a bed of sintered bauxite particles, and means for preventing the bed of free-flowing particles from being deformed during use of the pack.

Abstract: The invention comprises (a) an improved cross wound yarn package on which the final few turns of yarn are wound as a compact pile wound bunch on the cylindrical cross wound package surface; (b) apparatus for winding such a package, comprising a fixed pile winding guide (4 in FIG. 3) as well as a traverse guide (1 in FIG. 3) and means effective to move the yarn from one to the other (5 in FIG. 3); and (c) a modified yarn traverse roll with an extra circumferential groove to aid pile winding (2 in FIG. 1) intersecting a helical traverse groove (1 in FIG. 1).

Abstract: Disclosed is a melt-spinning process of the type wherein molten polymer is extruded downwardly through a fiber pack and through coaxial circular rows of holes of a spinneret to form a circularly arranged group of filaments. Quench gas is directed across the filaments emerging from the spinneret, and the cooled filaments are gathered and redirected at a guide, which may be stationary or rotating. The quench gas is delivered by a conduit extending downwardly through the pack and spinneret coaxially relative to the rows of holes and then redirected and discharged laterally outwardly through the group of filaments above the guide.

Abstract: An improved woven fabric that is relatively stiff in the filling direction and relatively flexible in the warp direction by virtue of the filling yarns in the fabric being stiffer than the warp yarns in the fabric, wherein the improvement comprises the filling yarns comprise resin bonded multifilament yarns. The product has particular utility in seat belt safety harnesses with belt coiling mechanisms. It is preferred that the resin be a polyurethane in an amount of 0.4-2.0 weight percent; that the filling yarns be twistless polyester multifilament. The process involves the application of an uncured resin to the filling yarns prior to weaving, and curing the uncured resin, preferably after weaving during an otherwise conventional dyeing procedure.

Abstract: Disclosed is a melt-spinning process of the type wherein molten polymer is extruded downwardly through a filter pack and through an annular array of holes of a spinneret to form a circularly arranged group of filaments. Quench gas is delivered downwardly through said pack and spinneret coaxially relative to said row of holes and the redirected and discharged outwardly through the group of filaments. A finish substance is sprayed onto the filaments, and the filaments are gathered and redirected at a guide. The finish spraying comprises the steps of conducting the finish substance through the pack and through the spinneret internally of the flow of quench gas, and discharging the finish substance outwardly from within the group of filaments at a level below the discharge of quench gas.

Abstract: A guide encloses a group of traveling filaments arranged in a pattern forming a main longitudinal axis. The guide comprises a carrier movable toward and away from the filament group. A plurality of relatively movable members are mounted on the carrier for movement between open and closed positions. Those members form a through-passage for the filament group in the closed position. An actuating mechanism is operatively connected to the carrier and members for extending the carrier toward the filament group, and closing the members around the filaments to converge the filaments. Thereafter, the carrier is retracted to a position where a longitudinal axis of the through-passage is substantially aligned with the main longitudinal axis formed by the filament group.

Abstract: In the melt-spinning of filaments molten polymer is extruded downwardly through circularly arranged holes of a spinneret to form a circular group of filaments. Quench gas and finish liquid are conducted downwardly through the spinneret in alignment with a longitudinal axis defind by the filament group and are directed outwardly through the filament group. The filaments exhibit vibration during travel from the spinneret to the lower guide. The filaments are passed through and against a circular guide surface disposed around the filament group below the finish spray and above the lower guide. As a result, the filaments are deflected inwardly, in mutually spaced relationship, toward the longitudinal axis, whereby the amplitude of vibration of the filaments is reduced. The filaments are passed between walls extending upwardly from the guide surface and surrounding the filament group. Finish liquid is sprayed against the walls so that a finish environment is confined between the walls.

Abstract: An improved woven fabric that is relatively stiff in the filling direction and relatively flexible in the warp direction by virtue of the filling yarns in the fabric being stiffer than the warp yarns in the fabric, wherein the improvement comprises the filling yarns comprise resin bonded multifilament yarns. The product has particular utility in seat belt safety harnesses with belt coiling mechanisms. It is preferred that the resin be a polyurethane in an amount of 0.4-2.0 weight percent; that the filling yarns be twistless polyester multifilament. The process involves the application of an uncured resin to the filling yarns prior to weaving, and curing the uncured resin, preferably after weaving during an otherwise conventional dyeing procedure.

Abstract: A spinning assembly for use in a process for the production of sheath/core bicomponent fibers comprising a spinneret plate having at least one counter-bore terminating in an extrusion orifice, a distributor plate spaced apart from but facing the spinneret plate to provide a liquid channel therebetween for communication with a source of sheath-forming material, the distributor plate being provided with an aperture opposite each orifice in the spinneret plate for communication with a source of core-forming material and a plateau-like protrusion on the distributor plate extending about the axis common to the aperture and the extrusion orifice characterized in that there is provided an orifice plate for restricting the entrance to the counter-bore.

Abstract: Disclosed is a melt-spinning process of the type wherein molten polymer is extruded downwardly through a filter pack and through an annular array of holes of a spinneret to form a circularly arranged group of filaments. Quench gas is delivered downwardly through said pack and spinneret coaxially relative to said row of holes and then redirected and discharged outwardly through the group of filaments. A finish substance is sprayed onto the filaments, and the filaments are gathered and redirected at a guide. The finish spraying comprises the steps of conducting the finish substance through the pack and through the spinneret internally of the flow of quench gas, and discharging the finish substance outwardly from within the group of filaments at a level below the discharge of quench gas.

Abstract: Disclosed is a melt-spinning process of the type wherein molten polymer is extruded downwardly through a fiber pack and through coaxial circular rows of holes of a spinneret to form a circularly arranged group of filaments. Quench gas is directed across the filaments emerging from the spinneret, and the cooled filaments are gathered and redirected at a guide, which may be stationary or rotating. The quench gas is delivered by a conduit extending downwardly through the pack and spinneret coaxially relative to the rows of holes and then redirected and discharged laterally outwardly through the group of filaments above the guide.

Abstract: A selfbonded nonwoven fabric comprising at least 70 weight percent of sheath/core heterofilaments having a core of isotactic polypropylene in which the sheaths are high density polyethylene in an amount of 5 to 30 weight percent of the heterofilaments, and method of preparation. The fabrics have outstanding strength, fatigue resistance, and tear resistance and are eminently suitable for civil engineering applications such as unpaved road underlay material.

Abstract: The primary crimp frequency of crimped material is optically measured by utilizing the pattern of light reflections produced by the waviness of the material. The material is illuminated from one end thereof with light striking the material at a shallow angle to produce a pattern of bright and shadowed areas on the material. The light pattern is scanned by a reticon camera and an amplitude modulated output signal corresponding to the light pattern is obtained. The frequency of the output signal is measured to provide an indication of crimp frequency.

Abstract: Fabrics containing at least 50 percent by weight of polyester staple fiber have their pilling propensity greatly reduced by a process that involves (i) atomizing an aqueous solution of certain alkaline saponification agents, such as sodium hydroxide, (ii) applying the atomized solution in controlled amounts to at least one surface of the fabric, and (iii) heating the sprayed fabric to a temperature within the range of 115.degree. C. to 165.degree. C. for about 5 to 120 seconds.

Abstract: An improved replaceable filtration unit for high viscosity fluids, of the self sealing semi-disposable type and having inert granular material supported by a screen within a housing, wherein the improvement comprises having the screen's rim swaged into the housing, preferably with an interference fit within the range 0.005 to 0.015 inches. The invention improves the performance of packs used to filter and extrude molten polymer into shaped articles.

Abstract: A spinning assembly for use in a process for the production of sheath/core bicomponent fibres comprising a spinneret plate having at least one counter-bore terminating in an extrusion orifice, a distributor plate spaced apart from but facing the spinneret plate to provide a liquid channel therebetween for communication with a source of sheath-forming material, the distributor plate being provided with an aperture opposite each orifice in the spinneret plate for communication with a source of core-forming material and a plateau-like protrusion on the distributor plate extending about the axis common to the aperture and the extrusion orifice characterised in that there is provided an orifice plate for restricting the entrance to the counter-bore.

Abstract: An improved apparatus for cutting material such as filamentary tows into predetermined lengths comprising (a) a cutting assembly including a plurality of spaced apart knife edges secured to a mounting member at equal radial distances from a point on said mounting member thereby forming a reel, each of said radial distances in every instance being less than the distance from said point to the periphery of said mounting member; (b) said cutting assembly having means adapted to receive successive wrappings of material to be cut in contact with a plurality of said knife edges so that no relative movement occurs between said material and said knife edges longitudinally of said material; and (c) means for forcing said material between adjacent knife edges thereby severing said material into lengths of controlled dimensions, wherein the improvement comprises: means for preventing at least most of said knives from moving in a direction longitudinal of said knife edges.

Abstract: A selfbonded nonwoven fabric comprising at least 70 weight percent of sheath/core heterofilaments having a core of isotactic polypropylene in which the sheaths are high density polyethylene in an amount of 5 to 30 weight percent of the heterofilaments, and method of preparation. The fabrics have outstanding strength, fatigue resistance, and tear resistance and are eminently suitable for civil engineering applications such as unpaved road underlay material.

Abstract: An apparatus and a method to express liquid from wet fibrous material while minimizing breakage thereof and splashing of the solvent and easying solvent recovery. The method comprises laying said material on a smooth perforated surface, gradually compressing said body of wet fibrous material against said surface to force out liquid, and removing from said surface said body of material in a drier state. A convenient way to compress said body is by exerting on it a gradually increasing compression by means of a second roller having a smooth surface.