Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1995-06-07
1998-03-10
Nguyen, Khanh P.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
264 407, 2642094, 26421113, 264167, 26417126, B29C 4792
Patent
active
057258147
ABSTRACT:
A coextrusion system employs two or more extruders, each with a gear pump at its output connected to a coextrusion die. Different materials are extruded by each extruder. Varying the speed of one or both gear pumps varies the content of the extrudate. The gear pumps permit precise variation of the relative content of the materials extruded by the several extruders lengthwise along the extrudate. A display of a cross sectional dimension of the extrudate along a length of the extrudate permits observation of the lag that occurs between alteration of gear pump speed (or air pressure in the case of tubular or blown sheet extrudates) and the resultant change in dimension, so that a speed correction can be made at the appropriate time to compensate for differing shrinkage and stretching characteristics between the several extruded materials.
REFERENCES:
patent: 4171193 (1979-10-01), Rahlfs
patent: 4209476 (1980-06-01), Harris
patent: 4305703 (1981-12-01), Lupke et al.
patent: 4515738 (1985-05-01), Anders
patent: 4613471 (1986-09-01), Harris
patent: 4693855 (1987-09-01), Herbert
patent: 4721589 (1988-01-01), Harris
patent: 4828770 (1989-05-01), Fabian et al.
patent: 5078930 (1992-01-01), Herrington
patent: 5128076 (1992-07-01), Akselrod et al.
patent: 5128077 (1992-07-01), Stevenson et al.
patent: 5179521 (1993-01-01), Edge
"The Geartruder--A Powerful New Tool for the Plastics Extrusion Industry," Harrel, Incorporated. Undated.
"The Geartruder by Harrel," Harrel, Incorporated. Undated.
"Melt Pump Systems for Extruders by Harrel," Harrel, Incorporated. Undated.
Harrel Incorporated--Four Extruder, Four Gear Pump Sheet Co-extrusion Installation, 1982, per attached photograph.
Harrel, Inc.
Nguyen Khanh P.
LandOfFree
Extrusion of an article of varying content does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Extrusion of an article of varying content, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extrusion of an article of varying content will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-136827