METHOD FOR THE PRODUCTION OF PENCIL LEADS AND PENCIL LEADS PRODUCED BY THE METHOD

摘要

01386-221ABSTRACT OF THE DISCLOSUREMETHOD FOR THE PRODUCTION OF PENCIL LEADSAND PENCIL LEADS PRODUCED BY THE METHODThe invention is concerned with the production ofpencil leads and also pencil leads as produced by the proposedmethod. In accordance with the invention graphite, enamelfrit and quartz flour, preferably at least approximately in aratio of one part of graphite, two to four parts of enamelfrit and one part of quartz flour are processed to form astarting mixture, which is then pressed into the form of alead, is dried and is fired. The invention renders itpossible to perform sintering below a temperature of 550°C andaccordingly to perform the sintering firing operation in anormal oxidizing atmosphere.