Apparatus for and a method of producing moulding sand for moulds
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United States of America Patent
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-
Apr 10, 1990
Grant Date -
N/A
app pub date -
Nov 7, 1988
filing date -
Nov 12, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mould forming mix of ingredients including sand, a binder, and a catalyst blend is produced. The catalyst blend includes at least two catalysts one of which is slow acting and the other of which is fast acting. The ratio of the fast and slow catalysts used to make up the catalyst blend depends on the time to hardening required, and the temperature of the sand. A data processor is used to combine information concerning the hardening time, the temperature, and the rate at which materials are fed to a mixing unit, and to process the information in order to operate catalyst suppliers which supply the fast and slow catalysts.
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