Plastic and nonmetallic article shaping or treating: processes – Removal of liquid component or carrier through porous mold... – By direct application of vacuum or pneumatic pressure
Patent
1991-06-03
1993-09-21
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
Removal of liquid component or carrier through porous mold...
By direct application of vacuum or pneumatic pressure
264 35, 264101, 264233, 264259, 264310, 264333, 264341, 264344, 425 85, B29C 7100, E04B 116
Patent
active
052466507
ABSTRACT:
A roller vacuum apparatus removes cement slurry from a freshly laid exposed aggregate surface. In one embodiment, the exposed aggregate surface is applied to a cement substrate which is worked to compact the aggregate and draw the portland cement in the mixture to the surface of the coating. Subsequently, the surface coating is washed to remove excess portland cement. The roller vacuum removes the cement slurry without disturbing the freshly laid exposed aggregate surface by wicking the slurry into a transfer medium of the vacuum roller. A vacuum is applied to the transfer medium to remove the cement slurry from the roller.
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