Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Patent
1998-03-05
2000-08-15
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
2642092, 2642098, 2642102, 425145, 425380, 4253824, 425466, 425467, B29C 4720, B29C 4792
Patent
active
061031518
ABSTRACT:
An extrusion die for extruding biodegradable material into a flexible, pliable and non-brittle structure, the extrusion die including: a cylindrical mandrel; a cylindrical outer ring positioned concentrically around the mandrel; an annular extrusion orifice between the mandrel and the outer ring; and a flow control device which controls flow of biodegradable material through the extrusion die, wherein the flow control device comprises a mechanism which translates the outer ring to adjust the width of the annular extrusion orifice, and wherein the flow control device further includes a flow control channel upstream of the extrusion orifice which throttles flow of the biodegradable material through the die. A process for extruding biodegradable material into a flexible, pliable and non-brittle structure, the process including: pressurizing biodegradable material in an extruder; cooking biodegradable material in the extruder; charging an extrusion die with biodegradable material from the extruder; controlling the flow rate of biodegradable material through the extrusion die, wherein the controlling includes adjusting a width of an extrusion orifice, and wherein the controlling comprises throttling the biodegradable material upstream of the extrusion orifice through a flow control channel.
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Bittner Donald R.
Franke Hans G.
Beard, Jr. R. William
Standard Starch, LLC
Tentoni Leo B.
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