Plastic article or earthenware shaping or treating: apparatus – Stock pressurizing means operably associated with downstream... – Centripetal elastic melt extruder type
Patent
1995-04-14
1996-04-30
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Stock pressurizing means operably associated with downstream...
Centripetal elastic melt extruder type
264167, 264209200, 264209800, 425382400, 425465, 425466, B29C 4722
Patent
active
055119654
ABSTRACT:
An apparatus for making extruded tubing having one or more lumens therein with a variable outer diameter. The apparatus is useful for forming tubing of an extrudable material such as an elastomer or thermoplastic. The extrudable material is forced around a mandrel and through a die aperture over a mandrel wherein the inside surface of the tubing is of uniform diameter along its length but the wall thickness varies throughout its length. Such an apparatus may be used, for example, to make kink-resistant tubing. In one embodiment, the aperture in the extrusion die has a variable diameter while the mandrel remains constant. In a second preferred embodiment, a moveable ring with a central aperture is disposed within the extrusion chamber coaxially with the mandrel. The ring is capable of reciprocal motion in the direction of extrusion. During extrusion, when the moveable ring is moved toward the die opening, it constricts the outer diameter of the tubing thus formed. When the ring is moved away from the die opening, the outer diameter of the extruded tubing increases to the full diameter of the die opening.
REFERENCES:
patent: 2780835 (1957-02-01), Sherman
patent: 3124839 (1964-03-01), Adams
patent: 3134832 (1964-05-01), Smith
patent: 3144682 (1964-08-01), Thielfoldt
patent: 3147515 (1964-09-01), Amsden
patent: 3209404 (1965-10-01), Hagen
patent: 3446884 (1969-05-01), Miller et al.
patent: 3480999 (1969-12-01), Carlo
patent: 3540094 (1970-11-01), Janssen
patent: 3850568 (1974-11-01), Bartha et al.
patent: 4124351 (1978-11-01), Garbuio
patent: 4626183 (1986-12-01), Shirai et al.
patent: 5120212 (1992-06-01), Reiber et al.
Batdorf David B.
Nordgren Gregory N.
Schryver Charles A.
Leyson Joseph
Petit Michael G.
Specialty Silicone Fabricators, Inc.
Woo Jay H.
LandOfFree
Apparatus for extruding tubing having a variable outer diameter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for extruding tubing having a variable outer diameter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for extruding tubing having a variable outer diameter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-624429