Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
BAKED PENCIL LEAD AND MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JPH08238887
Kind Code:
A
Abstract:

PURPOSE: To provide a baked pencil lead in which strength, density and writing performance are provided in balance and a method for manufacturing the same in a pencil lead such as for a wood pencil or a mechanical pencil.

CONSTITUTION: In a method for manufacturing a pencil lead comprising the steps of adding and kneading graphite, body material such as carbon black, bonding material such as clay, natural polymer, pitch, asphalt as main materials, as required solvent and/or plasticizer, extrusion molding the mixture, and baking it at a high temperature, wherein ultra-thin graphite having mean particle size of 0.5 to 10.0μm, thickness of 0.7μm or less, specific surface area of 10 to 200m2/g is used as the part of at least the body material. Thus, the lead having a bulk density of 1.38 to 1.62g/cm3 is obtained.


Inventors:
SHIMIZU OSAMU
Application Number:
JP4709695A
Publication Date:
September 17, 1996
Filing Date:
March 07, 1995
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MITSUBISHI PENCIL CO
International Classes:
B43K19/02; B43K19/18; (IPC1-7): B43K19/02; B43K19/18
Attorney, Agent or Firm:
Hiromitsu Fujimoto (1 outside)