TY - JOUR N2 - More and more foundry plants applying moulding sands with water-glass or its substitutes for obtaining the high-quality casting surface at the smallest costs, consider the possibility of implementing two-layer moulds, in which e.g. the facing sand is a sand with an organic binder (no-bake type) and the backing sand is a sand with inorganic binder. Both kinds of sands must have the same chemical reaction. The most often applied system is the moulding sand on the water-glass or geopolymer bases – as the backing sand and the moulding sand from the group of self-hardening sands with a resol resin – as the facing sand. Investigations were performed for the system: moulding sand with inorganic GEOPOL binder or moulding sand with water glass (as a backing sand) and moulding sand, no-bake type, with a resol resin originated from various producers: Rezolit AM, Estrofen, Avenol NB 700 (as a facing sand). The LUZ apparatus, produced by Multiserw Morek, was adapted for investigations. A special partition with cuts was mounted in the attachment for making test specimens for measuring the tensile strength. This partition allowed a simultaneous compaction of two kinds of moulding sands. After 24 hours of hardening the highest values were obtained for the system: Geopol binder - Avenol resin. L1 - http://journals.pan.pl/Content/87361/PDF/07_paper.pdf L2 - http://journals.pan.pl/Content/87361 PY - 2013 IS - No 2 DO - 10.2478/afe-2013-0033 KW - Innovative materials and foundry technologies KW - mechanical properties KW - Two-layer moulds KW - Moulding sands KW - Alkaline organicbinder A1 - Holtzer, M. A1 - Bobrowski, A. A1 - Drożyński, D. A1 - Makselon, J. PB - The Katowice Branch of the Polish Academy of Sciences DA - 2013 T1 - Method of the Moulding Sands Binding Power Assessment in Two-Layer Moulds Systems / Metoda oceny wielkości siły wiązania mas w układzie form dwuwarstwowych UR - http://journals.pan.pl/dlibra/publication/edition/87361 T2 - Archives of Foundry Engineering ER -