Plastic article or earthenware shaping or treating: apparatus – With interposed non-adhering web or sheet type parting means
Patent
1978-01-30
1980-05-27
McQuade, John
Plastic article or earthenware shaping or treating: apparatus
With interposed non-adhering web or sheet type parting means
425420, 425421, B28B 302
Patent
active
042048206
ABSTRACT:
A method for the formation of resin-bonded grit slabs is described, in which a mixture containing inert minerals, and liquid resin in the minimum quantity necessary to bind the inert materials together, in order to avoid any excess of binder and thus to reduce the coefficient of thermal expansion of the finished product to levels compatible with its use, is subjected to combined pressure and vibration, in an airless environment, to obtain porosity-free slabs. The apparatus comprises a conveyor belt for automatically transferring the material, consisting of grit and resin mix in the quantity provided by a dispenser and held between two continuous sheets of cardboard under a vacuum vibratory press in which a slab is formed, and means for transporting the formed material into a drying oven in which the process is completed, with rapid polymerization of the resins, to produce grey slabs.
REFERENCES:
patent: 1814172 (1931-07-01), Martinet
patent: 3103698 (1963-09-01), Wollett
patent: 3372217 (1968-03-01), Paerels et al.
patent: 3712785 (1973-01-01), Hirt et al.
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