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US 6,960,367 B2Granted
Sandcasting pattern coating compositions
AssigneeThe Hill and Griffith Company
InventorsVictor Steven LaFay, Stephen Louis Neltner
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AssigneeThe Hill and Griffith Company
InventorsVictor Steven LaFay, Stephen Louis Neltner
Estimating the term…
Sand casting is an old art. In this molding process sand is compacted around a pattern and the pattern is removed, leaving a mold cavity the shape of the pattern. Molten metal can then be poured into the cavity to form the object. To increase the life of the mold, and to make removal of the pattern easier, the pattern must be coated with a protective material. Despite many available pattern coating compounds, mineral seal oil, and a mixture of mineral seal and clay, have been the commercial choices. Hereby the advantages of mineral seal oil-clay pattern coating compositions are retained without its detriments by utilizing a vegetable oil base in a pattern coating composition to replace some or all of the mineral seal oil to provide biodegradable coating compositions with reduced VOC content.
In the method of protecting foundry molds from eroding and pitting during sandcasting by preventing adherence of molding sand to mold pattern surfaces, wherein a pattern coating composition is applied to the mold pattern surfaces in an amount sufficient to form a coating thereon which prevents adherence of sand to the mold pattern, the improvement comprising coating the mold pattern surfaces with a pattern coating composition comprising from about 10% to 99.5% vegetable oil and a viscosity reducer selected from the group consisting of mineral seal oil, alcohol and mixtures thereof.
A method for facilitating release of molding sand from mold pattern surfaces comprising applying to the mold pattern surfaces an effective amount of a biodegradable pattern coating composition, wherein the biodegradable pattern coating composition comprises from about 10% to 99.5% vegetable oil;
Dependencies are inferred from the claim text.