Glass manufacturing – Processes – Self-supporting particle making
Patent
1979-08-15
1980-11-18
Lindsay, Jr., Robert L.
Glass manufacturing
Processes
Self-supporting particle making
65 22, 106 40V, C03B 1910, C03B 1908
Patent
active
042343305
ABSTRACT:
A process of making cellulated glass beads by forming a mixture comprising glass particles and cellulating agent into nodules, heat treating the nodules to cause fusion of glass and evolution of gas from the cellulating agent to form cellulated glass beads, and cooling the cellulated glass beads to a rigid condition. The cellulating agent utilized has the characteristic of creating expansion forces due to the evolution of gas during heat treatment which are generated wholly or mainly while the glass viscosity is within the range 10.sup.6.5 to 10.sup.8.5 poises. The heat treatment is carried out with a quantity of cellulating agent at a maximum cellulation temperature which is not above the temperature corresponding with a glass viscosity of 10.sup.5.5 poises and for a time such that the beads immediately following the heat treatment are populated with cells, and after cooling have a bulk density of not more than 0.5 g/cm.sup.3 and a water-permeability of less than 15% by volume determined by the immersion test herein specified.
REFERENCES:
patent: 2691248 (1954-10-01), Ford
patent: 3174870 (1965-03-01), Connelly
patent: 3325341 (1967-06-01), Shannon
patent: 3443920 (1969-05-01), Overcashier et al.
Florean Jean
Glineur Michel
Taupin Pierre
BFG Glassgroup
Lindsay, Jr. Robert L.
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