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agnetic Sound Tracks for Precised 16mm Motion Picture Film
THOMAS R. DEDELL
The procedure developed at Eastman Kodak Co. for applying magnetic sound tracks to processed 16mm motion picture film is fully described. Complete details are given for the coating composition, the dispersing technique and the method of coating. The bead coating method is used. Problems related to coating on film are discussed. Sound-quality measurements are reported comparing these coatings with commercial quarter-inch tape.
.T is THE PURPOSE of this paper to de-ibe in detail the procedure developed the laboratories of the Eastman Kodak ). for applying magnetic sound tracks 16mm motion picture film. For purpose, the track width is limited one-tenth of an inch or less, and the is applied only to processed Eastfilm.
ig Formula
The formulas described here are iposed of an iron oxide, as the basic lient, dispersed in a mixture comof a binding material, solvents, a plasticizer in appropriate quantiThe selection of the materials and ter amounts are determined by the following conditions :
sented on October 10, 1952, at the :iety's Convention at Washington, D.G., Thomas R. Dedell, Eastman Kodak Co.,
Park Works, Rochester 4, N.Y. paper was received on September 1 5, [952.)
1. The magnetic material must have physical and magnetic characteristics capable of rendering desired sound quality.
2. The binder-solvent combination should allow easy dispersion of the oxide in order to obtain acceptable sound quality.
3. The coating must give satisfactory adhesion to both the base and emulsion of film.
4. The binder, in addition to giving good adhesion of the coating to the film, must also provide adequate binding of particles within the coating.
5. The coating should cause no unacceptable physical deformation of the film.
6. For use with the bead coating method, the solvents must be high boiling so that negligible viscosity changes occur while coating. At the same time, it must be practical to cure out the solvents at temperatures not above 110 F.
7. The solvents must be good solvents for the binding material and prac
April 1953 Journal of the SMPTE Vol. 60
491