Abstract: A method of manufacturing a reinforced flexible tube in which a hard synthetic resin spiral core is embedded in and fused to a soft synthetic resin matrix through the medium of a semi-hard synthetic resin adhesive layer and the apparatus for carrying out the method of manufacturing the tube. Hard and semi-hard synthetic resin materials are simultaneously extruded from extruders to form a first composite linear element in which these two separate materials are firmly bonded together owing to the small extruding temperature difference between these two separate materials. The first composite linear element is preheated to make the temperature difference between the linear element and a soft synthetic resin material to be extruded on the linear element small.

Abstract: A spunbonded fabric of nylon 6, bonded by binders such as polyacrylates and polyurethanes, in which the filaments are substantially in the .gamma.-modification in the crystalline regions and the average molecular orientation, produced by attenuation, of the nylon 6 filaments is at most 80% of the theoretically possible orientation. It is an object of the invention to produce spunbonded fabrics of improved properties and to do so more economically, e.g. with higher outputs.

Abstract: Lubricants for the production of net-like products from nylon and polytetramethylene terephthalate are disclosed. The lubricants comprise polyolefin with a specific melt index, said polyolefins being homopolymers of olefins or copolymers of two or more olefins.

Abstract: Method for melt spinning from inelastic materials extruded lengths of predetermined cross-sections from predetermined arrangements in spinnerets of non-round orifices having one axis or no axis of symmetry in the plane of the spinneret face, and to such arrangements of two or more such spinning orifices in spinnerets for practice of the method by which non-axisymmetric emergence behavior, i.e., "kneeing," of inelastic fluid streams from spinnerets is utilized. Each non-round orifice in the arrangement has a significant kneeing potential of greater than (.+-.) 0.1, and preferably greater than (.+-.) 0.

Abstract: Dimensionally stable, high-tenacity non-woven webs and process for their manufacture. The non-woven webs of the invention are distinguished by a relative grab-tensile strength of at least 200 p/g/m.sup.2, a breaking extension of not more than 50% and a shrinkage of not more than 1%, as measured at 160.degree.C, and are primarily useful as reinforceing and backing materials in the manufacture of needle-punched and tufted carpets.

Abstract: A battery separator and the process for preparing it, having excellent abrasion resistance, stiffness, porosity, pore size, and electrical resistance is produced by a process that includes degrading a fiber forming polymer, melt-blowing fibers from the degraded polymers and forming a non-woven mat of the fibers randomly laid and self-bonded. The non-woven mat is then compacted, in a critical manner, preferably at temperatures for polypropylene of from 290.degree. to 310.degree.F., using relatively low pressures, i.e. 10 psi/in.sup.2 or lss, to obtain a battery separator meeting precise and essential specifications.

Abstract: A fibrous body which includes at least two layers of strands of continuous filaments and binder particles in each layer. One of the layers has filaments of the strands therein at least partially dispersed to form a mesh size which entraps binder particles therein which have a mesh size larger than the mesh size of the dispersed filament layer, as well as smaller size particles lodged at intersections and crossovers. Another layer has strands which form a mesh size which do not necessarily entrap binder particles but may retain particles therein at interstices of strands. The fibrous body has a binder content in the dispersed filament layer which is larger per unit volume than the binder content of the other layer. Preferably a plurality of successive layers of continuous multi-filament strands are deposited on a collecting surface in a mat-like mass.

Abstract: Method of making multiple container carrier stock comprising strands of a resilient and deformable plastic material that has been extruded and fused in the molten or semi-molten state.

Abstract: In an apparatus and method suitable for the manufacture of composite yarns wherein a filament is introduced between two rotatable rollers, there is provided the improvement of a start-up means adapted to automatically introduce the filament between the two rollers, at least one of which has a further source of yarn-forming material thereon. In the apparatus and method of the invention, greater reliability and a decrease in downtime are achieved.

Abstract: An extruded integral plastics net structure comprising first sets of spaced parallel strands, second sets of spaced parallel strands extending transversely thereto, the sets of strands being joined together at all or certain of their points of intersection to form a net structure wherein the intersection points along any one strand are in the alternating forms of any two of the following: (a) integral masses of mirror image symmetry about the median plane of the net, (b) assymetrical junctions in which there is substantially only linear contact and adhesion between the strands and (c) symmetrical junctions having only linear contact with little or no adhesion between the strands.

Abstract: Netting of small net size is economically made by forming a network of crossing longitudinal and transverse threads, bonding the threads together at the crossings by individually moulded buttons of thermoplastic material and moulding small masses of thermoplastic material (which may or may not be the buttons at the crossings) bearing integrally moulded elements radiating towards the centres of the mesh openings. The radiating elements may terminate close to one another or be joined together by an integrally moulded boss in the central region of each mesh opening. The radiating elements effectively block the mesh openings or divide them up into smaller openings without requiring correspondingly large and possibly excessive lengths of threads. The netting is suitable for security purposes, for example at expositions.

Abstract: A method for making a cellular article in which at least some of a plurality of extruded, generally parallel streams of strand-forming organic, thermoplastic, polymeric material are periodically expanded to provide bulbous portions along the lengths thereof, with such bulbous portions contacting and bonding with adjacent streams during their expansion, after which the streams are set to provide an integral article.

Abstract: A spun bonded web of substantially continuous synthetic filaments has one side that is at least two times smoother than the other side. The majority of the filament cross points within the web are fuse bonded during the web spinning process. The web is spun by blowing a line of spaced, molten synthetic filaments onto a smooth collecting surface which is in motion substantially transverse to the direction of flow of the filaments. The filaments are still soft when they contact the collecting surface and flatten against the collecting surface to form the smooth side of the web. On the other side of the web, the filaments are randomly entangled to form the rough side of the web. A disposable diaper or like article is formed by covering at least one side of an absorbent pad with the fabric of this invention, the rough side of the fabric facing the absorbent pad and serving to anchor the pad against bunching, splitting, or separating.

Abstract: A non-woven web contains bicomponent filaments having a core of polypropylene and a sheath of specified copolyamides, together with polypropylene homofilaments, in which is embedded parallel yarns extending in its lengthwise direction. The yarns are composed of bicomponent filaments having a copolyamide sheath. The combination of properties of the product makes it suitable for use as a primary backing for tufted carpets.

Abstract: An apparatus and process for smoothing and densifying both the upper and lower surfaces of a filamentary mat or sheet as rows of freshly melt spun filaments are permitted to fall freely onto the surface of a liquid cooling bath whereby the individual filaments spread laterally at the bath surface to form helical to sinuous loops which then become self-bonded at overlapping points of intersection within a short distance below the bath surface. A flattening or densifying of upper and lower surfaces of the mat into a more rigid structural member is accomplished by inserting at least one pair of downwardly diverging plates within the bath such that the upper apex thereof extends parallel to the rows of filaments and falls within at least one outermost row of filaments, thereby deflecting such a row inwardly and upwardly over the apex as it is incorporated into an outer bonded surface of the mat.

Abstract: A process is provided for the continuous production of nonwoven webs in cylindrical or sheet form from thermoplastic fibers, spinning the fibers continuously from a melt onto a rotating mandrel and winding them up on the mandrel to form a generally spirally wound cylinder. Density of the wound cylinder is controlled by controlling the distance between the rotating mandrel and the orifices of the spinning die through which the molten polymeric material is spun. If the spinning of the fibers is continuous, the cylinder can be formed in a continuous length. Control of the spinning rate in relation to the diameter and rate of rotation of the mandrel and the rate of advance of the cylinder on the mandrel controls the thickness of the cylinder. The cylinder can be drawn off the mandrel and used as a cylinder, or either slit lengthwise and opened out, or collapsed onto itself, for use as a sheet. The process is particularly adapted for forming filter elements.

Abstract: Novel products are described which possess a capability of transmitting air and moisture vapor, are waterproof, and have fabric-like aesthetic properties. These products may have applications such as rainwear material, tent material, garment liners, and shoe liners. These products may be made by spray spinning filamentary polymer material onto open-celled polymer film, or onto non-cellular elastic polymer film with the additional steps of stretching and heat setting creating a stable open-celled structure in the film portion of the product. Subsequent calendering of the product may further improve its fabric-like aesthetic properties.