| 摘要 |
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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