METHOD OF MANUFACTURE OF ARTICLES FROM PLASTIC WASTES Russian patent published in 2003 - IPC

FIELD: technology of processing thermoplastic polymer materials; manufacture of articles from plastic polymer wastes. SUBSTANCE: method includes grinding, washing, drying and preheating the wastes which are subjected to injection molding. Prior to grinding secondary plastic wastes, they are divided in two parts: first part is single-type thermoplastic secondary waste after single processing without considerable damage of polymer structure whose characteristics are within boundaries of characteristics of primary initial material; second part is secondary raw material from articles made from polyethylene and/or polypropylene and polystyrene possessing known characteristics. After grinding, ground material is subjected to separation of it from admixtures before washing. After drying, raw material blend is prepared from dried secondary material by adding 20-50% of material of first part to material of second part whose amount is equal to 80-50% of total amount of raw material. EFFECT: enhanced efficiency. 2 cl, 2 tbl