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Single Screw Extruder For Processing Of Low Viscosity Preconditioned Materials Description

The present invention overcomes the problems outlined above and provides improved single    screw extruders including an elongated barrel having an inlet and a spaced, restricted orifice die outlet. The extruder also includes a single, elongated, axially rotatable, flighted [removed]// [removed] [removed] [removed] [removed][removed] [removed][removed] [removed]// [removed] screw assembly presenting a longitudinal axis and situated within the barrel and operable to move material from the inlet through the barrel and out the die outlet. The single screw extrudersassembly includes at least one elongated screw section having a central body defining a root diameter, and helical flighting extending outwardly from the central body and presenting an outer periphery with spacings between adjacent portions of the flighting. These spacings are each defined by a surface extending from a first outer periphery of one of the flighting portions to a second outer periphery of the adjacent flighting portion; each spacing-defining surface includes first and second surface segments respectively extending inwardly from the first and second peripheries and toward the central body, and a third surface segment interconnecting the first and second surface segments. The first and second surface segments and the proximal first and second flighting peripheries define respective angles of from about 75-90° relative to the longitudinal axis, and the joinder of the first and second surface segments is substantially smooth and arcuate without any substantial angular discontinuities or “corners.”

In further preferred forms, the respective angles are equal, and such angles are defined by 20% of the associated flighting depth, measured from the outer peripheries of the adjacent flighting portions. In some instances the respective angles at the outer peripheries are essentially 90° relative to the longitudinal axis of the screw assembly.

In particularly preferred forms, The single screw extruders assembly includes at least a pair of the improved screw sections of the invention, with one of such improved sections having a greater pitch than the other of the improved screw sections. The extruders of the invention can also be improved through the use of adjustable, flow-restricting valves along the length of the extruder barrel, and preferably located closer to the restricted die outlet than the improved screw section(s).

In other embodiments, the extruders hereof may include a disrupting/homogenizing screw section including a plurality of relatively short, flighted screw parts, with adjacent ones of the screw parts having an opposite pitch.

The single  screw extruders of the invention are advantageously used in conjunction with a preferred preconditioner of a type disclosed in U.S. patent application Ser. No. 11/875,033, filed Oct. 19, 2007, entitled “Improved Preconditioner Having Independently Driven High-Speed Mixer Shafts,” incorporated by reference herein. Broadly, such preconditioners comprise an elongated mixing vessel having an inlet and an outlet, the vessel outlet adapted for operable connection with the inlet of an extruder barrel. The preconditioners also have a pair of elongated mixing shafts within the vessel, each having a plurality of mixing elements, and with the shafts located in laterally spaced apart relationship within the vessel. A pair of variable drive mechanisms are operably coupled with the corresponding shafts in order to permit selective rotation of the shafts at individual rotational speeds independent of each other. A control device is operably coupled with the drive mechanisms to independently control the rotational speed of the shafts.

Preferably, the drive mechanisms include individual variable frequency drives operably coupled with the mixing shafts, and designed so as to allow rotation of the shafts in opposite rotational directions respectively.more:

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Can I get a adapter to change screw fittings to bayonet?

Yes, but they're pretty ugly.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=360093182679

Intematix Introduces Energy Star Certified LED-based Retrofit Downlight
FREMONT, Calif.----Intematix Corp., a leading innovator in phosphors, LED components and solid state lighting solutions, today announced the introduction of the DL6 solid state retrofit downlight, designed for installation in standard 6-inch recessed can fixtures.

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