Electric heating – Metal heating – Of cylinders
Patent
1991-11-27
1993-10-19
Reynolds, Bruce A.
Electric heating
Metal heating
Of cylinders
219 1055F, 219 1055M, 219 1059, 219 1061R, 219 1061A, 219 85, 219 95, 1562722, 1562724, 1563796, 285187, 285286, 428323, 428328, H05B 664
Patent
active
052548244
ABSTRACT:
A method and article for microwave bonding of thermoplastic pipe such as that used in the distribution of natural gas. The article is a composite bonding material (CBM) having a thermoplastic matrix (preferably polyethylene) which is miscible with the thermoplastic material of the pipe, and a plurality of microwave susceptor particles dispersed throughout the matrix. The preferred susceptors have improved heating properties whereby the total amount of metal oxide material in the CBM is about 1/10 of 1% by weight. A strip or sleeve is fashioned from the CBM and may be used, with or without a coupling, to join two pipes or repair ruptures. The method includes positioning of the article at the pipe joint or rupture, and application of microwave energy in an amount sufficient to heat the susceptors and cause both the CBM matrix and the adjacent portion of the pipe to melt and flow together, thereby producing a fusion bond.
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U.S. patent application Ser. No. 07/668974 filed on Mar. 13, 1991.
U.S. patent application Ser. No. 07/423220 filed on Oct. 18, 1989.
Chamberlain Craig S.
Dressler Daryl D.
Fish Brian J.
Griswold Gary L.
Hoang Tu
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Musgrove Jack V.
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