Method of making moulds

Details Method of making moulds Method of making moulds

1981-08-17

1984-10-09

Purser, Ernest R.

Refrigeration

Processes

Suspending in upwardly directed current

62 63, 299 7, F25D 1306, F25D 1700

Patent

active

044753500

ABSTRACT:
In the manufacture of moulds or mould cores, refractory sand, a resin binder and a catalyst are passed into a mixer to form a freeflowing mixture from which the moulds or mould cores are made. As the sand is fed into the mixer it is cooled by contact with an atmospheric gas in liquid or solid state or the cold vapour of such a gas so as to keep the temperature of the sand as it enters the mixer below that at which the resin cures. To enable the sand to be delivered below a chosen temperature from a quarry to a foundry where the sand is used, the sand after quarrying and drying is fluidized by air, an atmospheric gas in liquid or solid state being introduced into the fluidizing air so as to lower its temperature.

REFERENCES:
patent: 2136870 (1938-11-01), Vissac
patent: 2309036 (1943-01-01), Beardsley
patent: 3161485 (1964-12-01), Buhrer
patent: 3681851 (1972-08-01), Fleming

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