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Primary Examiner: Tillman, Murray
Assistant Examiner: De Benedictis, Sr., T.
Attorney: Haseltine, Lake & Waters

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Title: Quick-hardening core and molding sand composition, and a method for its hardening

Abstract: A quick-setting core and molding sand comprising quartz sand, a binder and an adsorbent or absorbent. The binder is a solution of a binding agent such as polystyrene, polyvinyl acetate or the like in an appropriate organic solvent. After molding, the sand is hardened by means of blowing it with an inert gas, preferably air or applying a suction thereto. The time of hardening is very short and depends upon the size of a mold or a core which is being made.

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Inventors: Harpula, Jan (Krakow, PO)
Piszak, Jur (Krakow, PO)
Debski, Mieczyslaw (Krakow, PO)
Rzepa, Tadeusz (Krakow, PO)
Sliwa, Jerzy (Krakow, PO)
Heryan, Andrzej (Krakow, PO)

Application Number: 473314
Filing Date: 1974-05-24
Publication_date: 1976-03-09
Assignee: Instytut Odlewnictwa (Krakow, PO)
Primary Class(es): 523/139 260/998.18, 524/35, 524/59, 524/441, 524/450, 524/515, 524/523, 524/524, 524/560, 524/563, 524/577
Other Classes:
US Patent Ref:

2444413	Jul, 1948	Weston	260/998.
2491006	Aug, 1947	Grube	260/DIG.
2503088	Apr, 1950	Barlow	260/998.
2765507	Oct, 1956	Wolf et al.	260/998.
2854715	Oct, 1958	Kura	260/998.
2991267	Jul, 1961	Bean	260/998.
3005245	Oct, 1961	Howard	260/998.
3024215	Mar, 1962	Freeman et al.	260/998.
3074802	Jan, 1963	Alexander et al.	260/998.
3107403	Oct, 1963	Moore	260/DIG.
3121268	Feb, 1964	Rubens	260/998.
3135029	Jun, 1964	Cooper et al.	260/998.
3318840	May, 1967	Weston	260/998.
3679703	Jul, 1972	Conrady et al.	260/41.

Other Refs: Other References: Schaller, Engineering Manufacturing Methods, (McGraw-Hill, 1959), p. 94.