Baked pencil lead and method for manufacturing the same

Details Baked pencil lead and method for manufacturing the same Baked pencil lead and method for manufacturing the same

1995-07-25

1998-09-01

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524495, 524496, 428408, G09D 1300

Patent

active

058012150

ABSTRACT:
Baked pencil leads are disclosed herein which are prepared by kneading, extruding and baking a composition containing a graphite as a filler and a binder, wherein a degree of orientation .pi. of the graphite in the direction of an extrusion axis measured by X-ray diffraction is 0.85 or more and the resultant leads have a flexural modulus of 100 GPa or more and a bending strength of 320 MPa or more. The baked pencil leads can be manufactured by carrying out the extrusion so that back face pressure just above an extrusion nozzle may be 300 kg/cm or more and a shear rate at a time when the molten kneaded composition passes through the nozzle may be 5.times.10.sup.4 (1/sec) or more.

REFERENCES:
patent: 3928520 (1975-12-01), Shinomoto et al.
patent: 4371632 (1983-02-01), Grossman et al.
patent: 5430075 (1995-07-01), Odashima
Database WPI, Section Ch, Week 8017, Derwent Publications Ltd., London, GB; Mar. 1980 (abstract).

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