Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Including plural heating steps
Patent
1976-02-12
1978-01-24
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Including plural heating steps
61106, 264 32, 264 455, 264 466, 264DIG14, B29D 2704, E04B 116
Patent
active
040696847
ABSTRACT:
A pipeline retard, support, and protection method wherein a fast-setting, expandable, organic spray foam is sprayed at spaced locations in a trench to create support pads and retards in the trench. The foam constituents are mixed in a spray apparatus and directed as a spray foam into the trench where it rapidly expands and stiffens into a layer of foam. Rapid expansion and corresponding rapid stiffening is believed to cause the cells in each layer of the foam structure to be elongated essentially normal to the plane of the layer. This cellular configuration in each layer imparts vertical strength and limited lateral flexibility to the structure. A plurality of layers of foam are sequentially formed in the trench to fabricate the desired structure. The placement of each layer is sequenced so as to permit a membrane to form on the surface of each layer for improved strength and inhibition of water penetration. The retards and/or support pads are created in the absence of forms or other foam molding means and each may be keyed to the trench surface for securement.
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Stengard; R. A., "Void Filling with Frothed Rigid Urethane Foam," Dupont Hylene Foam Bulletin, Wilmington, Del., E. I. DuPont de Nemours & Co., Inc., Jan. 16, 1961, pp. 1-8.
Knox, R. E. and R. A. Stengard, "Process Variables in Rigid Foam Frothing," DuPont Hylene Urethane Foam Bulletin, Wilmington, Del. E. I. DuPont de Nemours, Elastomer Chemicals Dept., Jan. 21, 1961, pp. 1-8.
Smith; Jerold B., "Frothing Rigid Urethane Foams," in Plastics Technology, Jan. 1964, pp. 35-37.
Zwolinski; Leon M., "Molded Integral-Skin Urethane Foam", in SPE Journal, Sept. 1969, vol. 25, pp. 24-27.
Anderson Philip
Workman H. Ross
Young J. Winslow
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