Abstract
Taguchi Methods have been used to improve the product quality in various indusutries. We have applied these methods in the development of developers and toners with good results. In this paper, the development of a high quality developer is reported. The developer formulation and production conditions were studied as control factors. The environmental conditions during the carrier and toner mixing stage were considered as noise factors. From the study, a developer having only a small fluctuation in triboelectric charge due to environmental changes and deterioration was successfully obtained.