Process and mould core for demoulding, from gypsum-core moulds, ceramic castings produced by the clay-casting process

摘要

The invention relates to a process for demoulding, from gypsum-core moulds, ceramic castings produced by the clay-casting process, which process is characterised in that, before the production of the gypsum-core mould, at least one air-permeable flexible tube, preferably a textile tube, which is closed at its immersion end is embedded in the gypsum-mould core and, after the hardening of the cast ceramic casting in the gypsum-core mould and after removal of the outer mould parts for demoulding the casting, compressed air of approximately 5 to 10 atmospheres above atmospheric pressure is forced, by means of a compressed-air gun or through a coupling connection to a compressed-air line, for the duration of approximately 10 to 15 seconds, into the opening, present on the mould core, of the end of the flexible tube. The invention also relates to a mould core for carrying out the process. IMAGE