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US 5,896,913 AGranted
Investment casting paper liner and guard
AssigneeProtech Marketing, Inc.
InventorDaniel B. Grandi
Life of this patent
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AssigneeProtech Marketing, Inc.
InventorDaniel B. Grandi
Estimating the term…
A paper receptacle is disclosed designed to improve the investment casting process in vacuum machines. The paper acts as both a vacuum liner and splash guard. It is fabricated as a perforated paper sheet having hooks, which is inserted in a cylindrical manner into casting flasks in order to provide a liner for congealing islands of solid investment plaster onto the surface of the casting flask resulting from the plaster slurry entering the holes; and a splash guard for investment slurry. After burnout, the liner facilitates the production of high-density metal porosity free castings at lower temperatures and in less time and with easy break away of investment plaster from the flask. The splash guard feature eliminates congealed slurry cleanup and prevents vacuum slurry boilover. The space saving resulting from this prevention enables more wax modules to be inserted into flasks increasing production.
A cylindrical investment casting flask having top and bottom circular edges, a perforated paper liner snugly positioned within said flask, said liner having a bottom end located above said flask bottom edge, whereby the perforations in said liner permit communication between said flask and investment material located within said liner, and the space between said liner bottom end and said flask lower edge permits communication between the investment material and the flask at said space, whereby when said liner is burned away, an annular vacuum chamber is provided in the area formerly occupied by said liner.
Dependencies are inferred from the claim text.