TY JOUR TI PROCESSING POLYMER MATERIALS BY FREE CASTING UNDER VACUUM KW polymer processing KW vacuum casting KW elastic forms KW small-scale production JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Tuzhilin, S.P. AU Lopatina, Y.A. AU Sviridov, A.S. PY 2020 IS 5 PB Belgorod State Technological University named after V.G. Shukhov