磁性粉体の混練および分散とその評価

概要

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For industrial production of videotapes with high magnetic retentivity, a welldispersed state of magnetic powder must be attained by kneading the particles with binder.<BR>In this work, kneading was performed under various operating conditions, and the relationships between state of kneading and the characteristics of videotapes were studied.<BR>The state of kneading was estimated from the required kneading torque and the tensile strength of kneaded products, and was also affirmed by scanning electron microscope examination of samples of kneaded produts.<BR>The degree of magnetic particles dispersion was surveyed by X-ray microanalysis, and the glossiness and SN ratio of coated videotape were measured for the final evaluation.<BR>From the results, optimum operating conditions for the production of highgrade videotape were clarified.