Richard O Colwell

US Patent:

41863062, Jan 29, 1980

Filed:

Dec 2, 1977

Appl. No.:

5/856821

Inventors:

Carl G. Necker - Littleton CO
Richard R. Colwell - Englewood CO

Assignee:

Johns-Manville Corporation - Denver CO

International Classification:

G01M 2300

US Classification:

250360

Abstract:

A perlite expander control system is disclosed in which a source of and detector for penetrating radiation are used to determine the density of an expanded perlite product flowing through a conduit. The density of the perlite product will be inversely proportional to the amount of penetrating radiation transmitted to the detector. A signal generated by the detector in response to the amount of transmitted radiation received is processed in appropriate circuitry to control the feed of raw perlite ore to the expander, thus resulting in the correct amount of ore being fed to the expander per unit time to result in obtaining the desired degree of perlite expansion. Typically beta, gamma or X radiation of various energies may be used as the penetrating radiation.

US Patent:

40374629, Jul 26, 1977

Filed:

Oct 12, 1976

Appl. No.:

5/731381

Inventors:

Carl George Necker - Littleton CO
Richard Rial Colwell - Englewood CO

Assignee:

Johns-Manville Corporation - Denver CO

International Classification:

G01N 900

US Classification:

73 32R

Abstract:

As disclosed herein, the dry density of a board product is monitored, preferably continuously so. The board is made by a wet forming process, which process includes preparing an aqueous slurry of at least some of the board's components, depositing the slurry upon a moving screen to form a moisture-laden sheet thereon, and removing the moisture to form the ultimate product. The dry density of this product is monitored by first simultaneously and automatically measuring the wet weight, moisture content and thickness of the water-laden sheet on the moving screen and from these measurements automatically calculating the dry density of the board product to be produced from the measured sheet.