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529 results about "Effective diameter" patented technology

Definition of effective diameter. i. The size of an excavation within its stress ring; it includes not only the actual hole in the rock but the destressed loose and semiloose rock that surrounds it. ii. Particle diameter corresponding to 10% finer on the grain-size curve. Also called effective size.

Dispensing cartridge with tortuous vent path

A dispensing cartridge for a relatively precise dispensing of various fluids having a relatively wide range of viscosities is disclosed. The dispensing cartridge in accordance with the present invention is relatively simpler in configuration than known dispensing cartridges while minimizing leakage of the fluid and eliminating problems associated with chemical attack of the O-ring by the fluid in the dispensing cylinder. In particular, the dispensing cartridge in accordance with the present invention includes a cylinder; a piston with a central bore and a bleed plug. In order to simplify the design, the air vent is configured as a tortuous path, for example, a spiral path, defined by a spiral bleed plug, which in a pre-staged position, allows air to freely escape along the spiral path along the circumference of the plug. As the piston contacts the fluid, the forward motion of piston is resisted by the high back pressure created by the small effective diameter and relatively long length of the spiral path. Once the piston contacts the fluid, the spiral plug is pushed into the piston closing the spiral path. By controlling the fluid flow by way of a tortuous path, the amount of fluid backflow through the piston is minimized if not eliminated, thus eliminating the need for an annular overflow chamber, thereby simplifying the design of the piston. In order to minimize problems related to the sealing of the piston within the dispensing cartridge, the piston may be provided with one or more radially extending sealing lips. These sealing lips are used in lieu of or in conjunction with an O-ring. The sealing lips further simplify the design by eliminating the O-ring as well as the need for an annular chamber adjacent thereto as well as problems relating to chemical attack of the O-ring by the fluid within the dispensing cylinder. In an alternative embodiment for use that is particularly adapted with non-aggressive fluids, the piston is provided with a single sealing lip and an O-ring.
Owner:NORDSON CORP

Aerodynamic error reduction for liquid drop emitters

A method is disclosed for forming a liquid pattern of print drops impinging a receiving medium according to liquid pattern data using a liquid drop emitter that emits a plurality of continuous streams of liquid at a stream velocity, vd, from a plurality of nozzles having effective diameters, Dn, arrayed at a nozzle spacing, Sn, along a nozzle array direction that are broken into a plurality of streams of print and non-print drops by a corresponding plurality of drop forming transducers to which a corresponding plurality of drop forming energy pulse sequences are applied. The method is comprised of forming non-print drops by applying non-print drop forming energy pulses during a unit time period, τ0, and forming print drops by applying print drop forming energy pulses during a large drop time period, τm, wherein the large drop time period is a multiple, m, of the unit time period, τm=mτ0, and m≧2; and a corresponding plurality of drop forming energy pulses sequences are formed so as to form non-print drops and print drops according to the liquid pattern data. The corresponding drop forming energy pulse sequences applied to adjacent drop forming transducers are substantially shifted in time so that the print drops formed in adjacent streams of drops are not aligned along the nozzle array direction. Also disclosed is a drop deposition apparatus for laying down a patterned liquid layer on a receiver, according to the disclosed methods, wherein the plurality of nozzles are grouped and shifted to partially or fully compensate for the shift in print position caused by the time shift of energy pulse sequences.
Owner:EASTMAN KODAK CO
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