Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1981-07-15
1987-12-08
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
264118, B29B 904
Patent
active
047117508
ABSTRACT:
A continuous process for casting a molten metal oxide such as an aluminous oxide and more particularly an alumina-zirconia eutectic composition that is subsequently crushed to produce an abrasive is provided wherein two thin metal belts are brought into face-to-face relation and the molten oxide is poured into the nip between the belts as they come into face-to-face relation. The material that is being solidified maintains the belts slightly spaced apart on the order of some small fraction of an inch (e.g. 1/16) and the back surface of the belt is flooded with copious quantities of cooling fluid (e.g. water) to maintain the belts below red heat. The belts are held in closely spaced relation for a sufficient time to permit the abrasive to be cooled below red heat. The belts are then separated and the abrasive is discharged from between the belts. At this point the abrasive is no longer affected by contaminants in the air, this aspect of the invention being particularly important in those embodiments of the invention where the molten abrasive (e.g. alumina zirconia abrasive) contains reduction products such as sub-oxides or elemental metal particles. In a preferred embodiment of the invention the top belt can be considerably wider than the bottom belt so that there is no water maintained on an upwardly facing surface which is subsequently to contact the molten abrasive.
REFERENCES:
patent: 3193888 (1965-07-01), Rochester
patent: 4070796 (1978-01-01), Scott
patent: 4165978 (1979-08-01), Sanzenbacher
Franklin Rufus M.
Lorin Hubert C.
Norton Company
Silbaugh Jan H.
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