Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1988-01-04
1989-06-27
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
26421123, 366 76, 366 79, 366 81, 366 89, 366 99, 366307, 366322, 425190, 425208, 425209, 4253823, B29C 3500, B29C 4700, B29C 4760, B29C 4780
Patent
active
048427888
ABSTRACT:
Extrusion machine and process, the machine having a barrel having a feed section for receiving solid extrusion material, and containing a screw for moving the solid extrusion material through a solids conveying section to a compression section of the barrel to generate heat and pressure to melt the extrusion material and force the melt through a downstream extrusion die. The solids conveying section of the barrel has a cross-section comprising a plurality of flat or slightly curved surfaces which extend substantially tangentially relative to the extrusion screw circumference, providing axial recesses which restrain the rotation of the solid extrusion material with the screw as it is moved axially into the compression section. The present machine and process causes plastic extrusion composition to be packed as a non-rotating mass to fill the solids-conveying and compression sections and increase the dead head pressure and extrusion output of the machine.
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McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Tentoni Leo B.
Thurlow Jeffery
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