Abstract:
The present invention aims to provide a polypropylene fiber (PP fiber) excellent in strength, heat resistance, and water-absorption properties, a method of producing the same, and a hydraulic composition, a rope, a sheet-shaped fiber structure, and a composite material with an organic polymer each using the PP fiber. The present invention provides: a PP fiber having a fiber strength of 7 cN/dtex or more and having either or both of (i) DSC properties such that the endothermic peak shape by DSC is a single shape having a half width of 10°C or lower and the melt enthalpy change (ΔH) is 125 J/ g and (ii) irregular properties such that the single fiber fineness is 0.1 to 3 dtex and irregularities are formed on the surface, the irregularities having an average interval of 6.5 to 20 µm and an average height of 0.35 to 1 µm as a result of alternate presence of a protruded portion having a large diameter and a non-protruded portion having a small diameter along its fiber axis; a method of producing the PP fiber by pre-drawing an undrawn PP fiber having an IPF of 94% or more at 120 to 150°C at a drawing magnification of 3 to 10 times, and then post-drawing the resultant at 170 to 190°C and a drawing magnification of 1.2 to 3.0 times under the conditions of a deformation rate of 1.5 to 15 times/min and a draw tension of 1. 0 to 2.5 cN/dtex; and a hydraulic composition, a rope, a sheet-shaped fiber structure, and a composite material with an organic polymer each using the PP fiber.
Abstract:
The present invention is a method of applying Lotus Effect materials as a (superhydrophobicity) protective coating for external electrical insulation system applications, as well as the method of fabricating/preparing Lotus Effect coatings. Selected inorganic or polymeric materials are applied on the insulating material surface, and stable superhydrophobic coatings can be fabricated. Various UV stabilizers and UV absorbers can be incorporated into the coating system to enhance the coating's UV stability.
Abstract:
Biomaterials in the form of non-woven felts, comprising carboxymethylcellulose salified with zinc associated with hyaluronic derivatives at varying percentages, for use in surgery to treat various kinds of wounds, pressure sores, burns, and in all conditions requiring the association of a wound healing and protective action with an antibacterial and/or antifungal action.
Abstract:
Disclosed is a method of forming multifilament polyolefin yarns and yarns formed according to the disclosed method. The yarns can be polypropylene yarns and can exhibit any of a high modulus, high tenacity, and a unique crystalline structure for multifilament polyolefin yarns. The process can generally include extruding a polymeric melt including the polyolefin at a relatively high throughput and low spinline tension and quenching the filaments in a liquid bath prior to drawing the fiber bundle at a relatively high draw ratio, for example greater than 10, in some embodiments.
Abstract:
A biomedia apparatus comprising an elongated central core and a plurality of loops positioned along the central core adapted to collect organisms from water. The biomedia apparatus may further comprise at least one reinforcing member associated with the central core. In one embodiment, the biomedia apparatus is utilized in a trickle tower to treat wastewater. In another embodiment, the biomedia apparatus is utilized outside a power plant to minimize spat that is drawn into the plant through water intake valves.
Abstract:
Non-fractured, non-fibrillatable short fibers, for reinforcing matrix materials such as concrete, have substantially uniform transverse cross-sectional areas along their length for maximum efficiency in pull-out resistance, and two different tapering characteristics along their lengths. Preferred bi-tapered fibers of the invention have a high modulus of elasticity in the range of 5-250 Gigapascal and are preferably modulated in both tapering dimensions. Matrix materials containing the fibers, as well as a method for making the fibers, are disclosed.
Abstract:
Disclosed is a method of forming multifilament polyolefin yarns and yarns formed according to the disclosed method. The yarns can be polypropylene yarns and can exhibit any of a high modulus, high tenacity, and a unique crystalline structure for multifilament polyolefin yarns. The process can generally include extruding a polymeric melt including the polyolefin at a relatively high throughput and low spinline tension and quenching the filaments in a liquid bath prior to drawing the fiber bundle at a relatively high draw ratio, for example greater than 10, in some embodiments.
Abstract:
Es wird ein Nähgarn aus Synthesefasern beschrieben, wobei das anwendungsfertige Nähgarn eine Höchstzugkraftdehnung zwischen 25 % und 85 % und eine solche zugelastische Dehnung aufweist, die zwischen 30 % und 95 % der Dehnung liegt, die bei einer Meßkraft bestimmt wird, die 70 % der absoluten Festigkeit des jeweiligen Nähgarnes entspricht. Desweiteren werden zwei Verfahren zur Herstellung eines derartigen Nähgarnes beschrieben, wobei das Nähgarn entweder aus einem Zwirn oder aus einem luftverwirbelten Nähgarn besteht. Zur Herstellung dieses Nähgarnes werden Garnkomponenten mit einer Höchstzugkraftdehnung zwischen 25 % und 85 % und einer zugelastischen Dehnung zwischen 30 % und 95 % ausgewählt, wobei nach der eigentlichen Garnerzeugung eine thermische und vorzugsweise eine hydrothermische Behandlung durchgeführt wird.