Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1982-06-28
1984-05-29
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264 407, 264142, 425145, 425149, 425308, 425311, 425313, 425382R, 425465, B29F 304
Patent
active
044514140
ABSTRACT:
In a face cutting apparatus having an extrudate feed means with an extrudate delivery end, a die plate and a cutter, an apparatus and method for controlling extrusion back pressure includes a die having a plurality of extrusion orifices through which a heat plastified material is adapted to be extruded, having a varying orifice density along the length of the die, a pressure sensing device for sensing the pressure adjacent the delivery end and an apparatus for moving the die relative to the delivery end in response to changes in the pressure adjacent the delivery end to align a die area of differing orifice density with the delivery end in order to adjust the flow rate of heat plastified material through the die and the extrusion back pressure.
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Miller Austin R.
Thurlow Jeffery R.
Welding Engineers, Inc.
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