FIELD: working of plastic material. SUBSTANCE: method involves providing auxiliary polymeric material 7, which may be transformed, upon hardening, to plastic state; placing material 7 into charging chamber 4 between casting piston 5 and basic polymeric material 6, with material 7 being thermoplast having toughness higher than that of basic material 6. Material 7 may be formed pelleted. Enclosure may be formed from material 7 and may be filled or supposed for filling with basic polymeric material 6. During molding, basic material 6 is pressed through gate 3 into cavity 1 of press-mold by casting piston 5 through auxiliary material 7. EFFECT: increased efficiency, simplified method and construction and improved quality of material. 11 cl, 6 dwg
