Extrusion of an article of varying content

Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...

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264 407, 2642094, 26421113, 264167, 26417126, B29C 4792

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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:
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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.

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