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EN
The subject of this paper was to compare the influence of selected coatings on bending strength of moulds and cores manufactured in a furan technology. In a range of study, there were used three kinds of coatings - water based coating and two kind of alcohol based coating manufactured by FOSECO. Coating were applicated by brush, overpouring/flow and spraying. For each application method, there were realized different kind of drying- at ambient temperature, in a furnace and by burning. Physicochemical properties of coatings were such selected to accommodate them to the application method and type of coating. Based on the conducted studies it was observed that for water based coating application method doesn’t have an important influence on bending strength and it is necessary to optimize the time and temperature of drying to achieve better results of bending strength. For alcohol based coatings, drying by burning causes significant deterioration of bending strength of the mould and core and drying process at ambient allows to obtain high bending strength of mould/cores in regard to time of drying.
EN
Investigation results of the drying rate of the selected protective water coatings are presented in the paper. The water coating WC-R was subjected to examinations. The drying kinetics of this coating was determined. The coating was deposited on cores of the moulding sand of the matrix grain size being: dL= 0.20 mm; 0.24 mm; 0.34 mm. In addition, the kinetics of the coating drying process was determined for three conventional viscosities (15s; 22s; 34s). The coating viscosity was estimated by means of the Ford 4mm cup. Drying rates of the protective coating were examined by using the gravimetric technique (weight). Measurements were carried out in a continuous way under controlled conditions: constant ambient temperature and air humidity.
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