Baked pencil leads and method for preparing same

Details Baked pencil leads and method for preparing same Baked pencil leads and method for preparing same

1993-09-08

1995-07-04

McCamish, Marion E.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

428368, 428402, 428688, C09D 1300

Patent

active

054300754

ABSTRACT:
Baked pencil leads in which a filler such as flaky graphite is oriented in a concentric tubular form in an outer peripheral portion of each lead and which has one or more layers spaced in a radial direction from the outer peripheral portion and comprising the filler oriented in the concentric tubular form between the central portion and the outer peripheral portion of each lead and in which the filler is at random or radially oriented in the other portions of each lead.
The baked pencil leads can be obtained by the use of a plurality of concentric conical tubular straightening plates having the sectional area of a flow path continuously decreased toward a nozzle orifice, in extruding a kneaded material mainly comprising the filler and a binder.
In the baked pencil leads, strength can be remarkably improved without lowering density, and thus these baked pencil leads are excellent in the balance between the strength and the density.

REFERENCES:
patent: 3843756 (1972-06-01), Talbott et al.
patent: 4209332 (1980-06-01), Tsujio
patent: 4371632 (1983-02-01), Grassman et al.
patent: 5118345 (1992-06-01), Handl
JP-4272971-A Derwent A84 602 p. 77.

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