Abstract:
A method for forming porous fibers is provided. The fibers are formed from a thermoplastic composition containing a continuous phase, which includes a matrix polymer, and a nanoinclusion additive that is at least partially incompatible with the matrix polymer so that it becomes dispersed within the continuous phase as discrete nano-scale phase domains. The method generally includes traversing a bundle of the fibers over one or more draw bars that are in contact with a fluidic medium (e.g., water). In certain embodiments, for example, the draw bar(s) are submerged in the fluidic medium. The fluidic medium is lower than the melting temperature of the matrix polymer.
Abstract:
Filter media and media packs that provide robust performance in high-speed rotating coalescer (HSRC) elements for crankcase ventilation systems are described. The filter media is HSRC filter media. As such, the filter media has a higher resistance to compressibility than traditional coalescer filter media, such as filter media used in low-speed rotating coalescer arrangements or stationary coalescer arrangements.
Abstract:
A composite flame barrier includes a woven or nonwoven fiber sheet material including flame resistant fibers of oxidized polyacrylonitrile; a mineral hydrate material at least partially embedded within the fiber sheet material. The fiber sheet material may be covered on one or two sides with an outer laminar material. The composite flame barrier is particularly useful in fire-rated wall assemblies, especially those designed to provide two, three and four hour fire-ratings, when tested according to ASTM E-119 or similar testing methods and standards.
Abstract:
Die Erfindung betrifft Feinstfaservliese und papierähnliche Produkte, die aus faserigen Flockengebilden aus glasartig erstarrten, reaktiven und zur Polymerbildung befähigten niedermolekularen Harzschmelzen bestehen. Bei Erreichung einer harzspezifischen Faserfeinheit kann eine durchgängige Polymerbildung und / oder Funktionalisierung mittels gezielter, nachträglicher äußerer Einwirkung von flüssigen oder gasförmigen Reaktanten oder Katalysatoren ausgelöst werden. Die Erfindung betrifft daneben ein Verfahren zur Herstellung der Feinstfaservliese oder papierähnlichen Produkte, bei dem reaktionsfähige, niedermolekulare Harzschmelzen in Gasmedien mit hohen Gasgeschwindigkeiten und Temperaturen oberhalb der Schmelztemperatur der niedermolekularen Harzschmelzen extrudiert, die entstehenden feinstfaserigen Gebilde verzogen und aufgesplittet werden, so dass eine Flockenbildung erfolgt. Die Flocken werden zu Vliesen oder papierähnlichen Produkten abgelegt. Durch Erhitzen und/oder durch Einwirkung von Katalysatoren wird das reaktionsfähige niedermolekulare Harz in ein duroplastisches Harz umgewandelt.
Abstract:
A multi-component fiber that includes a core component surrounded by a distinct sheath component is provided. The core component is formed primarily from polylactic acid and the sheath component is formed primarily from a polymeric toughening additive. The sheath/core configuration may provide a variety of different benefits to the resulting fiber. For instance, the polymeric toughening additive can help increase the ability of the fiber to absorb energy that arises from stresses imparted during fiber drawing, which increases the overall toughness and strength of the fibers. At the same time, the presence of the toughening additive in the sheath component can enhance the degree of bonding to other fibers (the same or different), such as when employed in a nonwoven web material. Another benefit of the present invention is that the sheath/core configuration may be formed from a thermoplastic composition in which the polylactic acid and polymeric toughening additive are blended together.