Method and article for microwave bonding of polyethylene pipe
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United States of America Patent
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Oct 19, 1993
Issued Date -
N/A
app pub date -
Nov 27, 1991
filing date -
Apr 7, 1989
priority date (Note) -
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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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