Abstract: The present invention relates to an improved die for use in textile processes involving nonwoven melt blown fabrics. In a melt blown process, molten polymer resins are injected into a melt blowing die and ejected or extruded from the die in the form of filaments. The present invention is directed to an improved die faceplate in combination with an extension plate that provides an extended flow path for an air jet to extrude a molten polymer filament of a reduced diameter in the melt blowing process.

Abstract: The present invention relates to a die nosepiece for use in textile processes involving nonwoven melt blow fabrics. In a melt blown process, molten polymer resins are injected into a melt blown die and ejected from the die in the form of filaments. The present invention is directed to an improved die nosepiece comprising a slit with serrated edges through which resin filaments are ejected.

Abstract: The present invention relates to a die for use in textile processes involving nonwoven melt blown fabrics. In a melt blown process, molten polymer resin is injected into a melt blown die and ejected from the die in the form of filaments. The present invention is directed to an improved die nosepiece comprising a multiplicity of adjacent holes offset with respect to each other at an angle greater than or equal to 5.degree. and less than 90.degree., through which resin filaments are ejected.

Abstract: A meltblown web is composed of fibers having a narrow fiber size distribution (expressed as % coefficient of variation of the average fiber diameter) and low packing density. The web is characterized as a soft lofty web and exhibits exceptional filtration capability. The web preferably comprises fibers having an average fiber size of between 3 and 10 microns and a packing density of between 5 to 15%, and a CV of 15 to 40%.

Abstract: A meltblowing die is provided with means for discharging crossflow air onto meltblown filaments to disrupt their shape and flow pattern between the die and the collector. The disruption enhances drag forces imparted by the primary meltblowing air and results in smaller diameter filaments.

Abstract: A take-off performance monitor uses a sensor to produce a movement signal proportional to the movement of an aircraft during a take-off roll and, for each take-off, historical data is generated and stored based on the movement signal. An analyzing unit of the monitor uses the historical data and current conditions to calculate a reference take-off distance, reference acceleration data and reference velocity data. This information is output to the pilor to facilitate his judgment as to the adequacy to take-off performance. In the preferred embodiment, the analyzing unit utilizes five samples of acceleration and velocity during a take-off roll to solve an equation for five constants that are indicative of take-off performance. The five constants relate to static thrust, a linear relationship between thrust and velocity, a non-linear relationship between thrust and velocity, air drag and rolling drag, and these five constants constitute at least part of the historical data.