Abstract
A theoretical and experimental study has been made concerning the relation between the rheological characteristics of polymer melts and the basic technological parameters of the extrusion process used for the production of double-layer films. A method is proposed here, and it has been proved out experimentally, for calculating the coextrusion process by which films can be produced from materials whose viscous characteristics follow a power-law relation. A formula is derived which relates the viscous characteristics of melts to the thickness ratios of films and layers of fluid in the extruder head. An equation is proposed for calculating the productivity of such an apparatus, its accuracy having been confirmed experimentally within ±7% for the coextrusion of two domestic grades of polypropylene.
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Literature cited
J. L. White, R. C. Ufford, K. R. Dharod, and R. L. Price, J. Appl. Polymer Sci.,16, No. 6, 1313 (1972).
M. L. Fridman, G. V. Vinogradov, A. Ya. Malkin, and O. M. Ponadii, Vys. Molek. Soedin.,A12, 2162 (1970).
Additional information
Petroleum Processing Plant, Moscow. A. V. Topchiev Institute of Petrochemical Synthesis, Academy of Sciences of the USSR, Moscow. Translated from Mekhanika Polimerov, No. 6, pp. 1107–1112, November–December, 1974.
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Fridman, M.L., Vlasov, V.I. & Malkin, A.Y. Production of double-layer polymer films. Process calculation. Polymer Mechanics 10, 950–954 (1974). https://doi.org/10.1007/BF00856248
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DOI: https://doi.org/10.1007/BF00856248