Keith W Luker, 726 Alida St, Little Falls, NJ 07424

5569429, Oct 29, 1996

May 5, 1995

8/435472

Keith Luker - Little Falls NJ

Randcastle Extrusion Systems, Inc. - Cedar Grove NJ

B29C 4772
B29C 4792

26421121

An apparatus provided for extruding a polymer in an extruder barrel having an upstream portion and a downstream portion with a discharge port. A hopper is positioned for delivering polymer to the upstream portion of the extruder barrel and a screw shaft is mounted for rotational movement in the extruder barrel. A drive means is connected for rotating the screw shaft. The screw shaft has a conveying screw flight and a metering screw flight arranged for conveying and metering the polymer through the barrel. A seal is provided for sealing against polymer flow and includes at least two different passageways positioned between a seal barrel and at least one seal shaft mounted for rotational movement within the seal barrel. The passageways are oriented to urge the polymer toward the screw shaft.

5486328, Jan 23, 1996

May 31, 1994

8/250909

Keith Luker - Little Falls NJ

Randcastle Extrusion Systems, Inc. - Cedar Grove NJ

B29C 4746
B29C 4750

26421123

An apparatus and method for extruding an elastomeric polymer which is subject to periodic pressure surges. The apparatus includes a barrel having an upstream portion and a downstream portion, a hopper positioned for delivering polymer to the upstream portion of the barrel, a shaft rotationally mounted within the barrel and a drive means for rotating the shaft. The shaft has a conveying screw flight for conveying polymer downstream from the hopper through the barrel. The barrel has a discharge port located downstream of the hopper. A surge suppressor is provided on the shaft for reducing the pressure and flow rate surges in the polymer. The surge suppressor includes a screw flight downstream of the discharge port for urging the polymer upstream toward the discharge while permitting a portion of the polymer to flow downstream into the surge suppressor. A polymer seal is provided downstream of the surge suppressor.

5518672, May 21, 1996

Jan 23, 1995

8/358601

Keith Luker - Little Falls NJ

Randcastle Extrusion Systems, Inc. - Cedar Grove NJ

B29C 4792

264 401

An apparatus is provided for extruding a polymer which is subject to periodic surges. The apparatus includes a barrel with an upstream portion for receiving polymer, a downstream portion and a discharge port near the downstream portion. The apparatus also includes a shaft mounted for rotational movement about a longitudinal axis within the barrel as well as drive means connected to rotate the shaft. The apparatus has a surge suppressor for urging polymer upstream toward the discharge port while permitting a portion of polymer to flow downstream into the surge suppressor. A sensor is positioned within the apparatus to detect surges in the polymer and a controller is connected to the sensor and to the drive means for adjusting shaft rotation in response to polymer surges.

4828780, May 9, 1989

Dec 1, 1987

7/127067

Keith W. Luker - Little Falls NJ

Killon Extruders, Inc. - Cedar Grove NJ

B29C 4704

264171

The invention provides a method for encapsulating extrudable materials within an extruded stream of another extrudable material. The produced product is an extruded material that contains one or more different materials embedded within the first material. The boundaries between this first encapsulating material and the material or materials thus encapsulated are well-defined and distinct. In the preferred embodiment, the encapsulated and encapsulating materials are plasticized thermoplastic resins. A stream of the encapsulating material is formed in a first extrusion channel. A plasticized stream of the material to be encapsulated, coated by a coextruded layer of the encapsulating material, is simultaneously formed and travels through a second extrusion channel. At any selected time, a cross-sectional segment of the second stream may be removed from its stream and replaces a similar cross-sectional portion of the stream removed from the first channel. The resulting stream of material extruded from the first channel contains discrete and uniformly shaped units of the second material encapsulated within a continuous stream of the first material.