Plastic and nonmetallic article shaping or treating: processes – Orienting or aligning solid particles in fluent matrix material
Reexamination Certificate
2005-06-14
2005-06-14
Eashoo, Mark (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Orienting or aligning solid particles in fluent matrix material
C264S040700, C264S177200, C264S211110
Reexamination Certificate
active
06905644
ABSTRACT:
This invention relates to a process and a device for producing components and semi-finished products from synthetic graphite or from ceramic granules, in particular for producing graphite tubes, involving shaping of a material to be mixed preferably containing petroleum coke or graphite granules, by means of an extrusion press (22) or an extruder, wherein the process provides the following steps:a) Pre-pressing the material (20) to be mixed in static or quasi-static manner, flow movements of the material (20) to be mixed being stopped or impeded in such a way that particles previously irregularly arranged in the material to be mixed are initially aligned transversely to the direction of pressing,b) Pressing out of the pre-pressed material (20) to be mixed through an outlet opening (28) of the extrusion press (22) or the extruder in such a way that owing to adjusted flow properties of the material (20) to be mixed, the particles within the pre-compressed material (20) to be mixed realign, starting from their transverse alignment, by an angle (β) of a maximum of 75° in the direction of pressing.
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Künzel Jürgen
Müller Holger
Schmid Manfred
Eashoo Mark
Greenberg Laurence A.
Locher Ralph E.
SGL Carbon AG
Stemer Werner H.
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