Glass manufacturing – Processes – With pore forming in situ
Patent
1978-08-16
1980-04-15
Lindsay, Jr., Robert L.
Glass manufacturing
Processes
With pore forming in situ
65134, 106 40V, C03B 1908
Patent
active
041982240
ABSTRACT:
Where a formulated glass cullet is utilized as a portion of the pulverulent batch material, the cellular material is prepared by first grinding the glass cullet in a ball mill with a cellulating agent such as carbon black until the pulverulent material attains an average particle size of about 4 or 5 microns. The pulverulent batch containing the glass cullet and cellulating agent is then sintered at a sintering temperature for a sufficient period of time to permit the glass cullet material to soften and coalesce and increase in density without, however, cellulating the glass batch. The sintering process is then interrupted and the sintered material may be cooled and crushed to a size that passes through a United States 10 mesh screen. The crushed and screened sintered material is then positioned in a suitable mold and subjected to a cellulating temperature of between about 1600.degree. F. (870.degree. C.) and 1650.degree. F. (899.degree. C.) for a sufficient period of time for the cellulating agent to react and cellulate the sintered batch and form a cellulated material. The resultant cellulated material is then quenched to terminate the cellulating process, removed from the mold and thereafter annealed. With the above process, it is possible to immediately subject the sintered material to the elevated cellulating temperature rather than slowly advancing the temperature from slightly above the sintering temperature to the cellulating temperature. In this manner the time required to cellulate the sintered batch is reduced substantially. The above process may also be utilized with a pulverulent batch comprising a combination of minerals and commercial chemicals that have not been melted to form a glassy type material, such as the glass cullet above described. By first sintering the pulverulent batch and thereafter heating sized sintered particles to a cellulating temperature, flaws such as folds and uneven densities frequently found in cellulated material are eliminated.
REFERENCES:
patent: 3207588 (1965-09-01), Slayter et al.
patent: 3441396 (1969-04-01), D'Eustachio et al.
patent: 3623897 (1971-11-01), Wojcik
patent: 3995956 (1976-05-01), Terner
Adams John M.
Lindsay, Jr. Robert L.
Pittsburgh Corning Corporation
Price, Jr,. Stanley J.
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