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Role of Polymer Science in Developing Materials for Phonograph Discs

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An introduction to the science of "flow and deformation" of vinyl chloride-vinyl acetate copolymers is given, along with the equipment used to study the theological parameters. The molding of phonograph discs is related to the melt viscosity and melt elasticity. A correct balance of melt viscosity and elasticity appears to be a prerequisite for the successful molding of discs. It is shown that the molecular structure of polymers used in the phonograph record compounds has a significant effect on the melt flow and dynamic properties and, thus, the processing of the compounds. It is suggested that polymer rheology is a very useful study in the development of materials and to understand such problems as improper molding, warpage of discs, wear life of discs, and pressing cycle times.

JAES Volume 24 Issue 6 pp. 464-469; August 1976
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AES - Audio Engineering Society