Invention Application
- Patent Title: COATING METHOD FOR PIPE HAVING WELD BEAD
- Patent Title (中): 带焊接管的管道涂层方法
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Application No.: US12278317Application Date: 2007-02-22
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Publication No.: US20090165944A1Publication Date: 2009-07-02
- Inventor: Robert E. Steele , Dennis T.H. Wong , Peter Singh , Chunglee Hank Yih
- Applicant: Robert E. Steele , Dennis T.H. Wong , Peter Singh , Chunglee Hank Yih
- Applicant Address: CA ON Toronto
- Assignee: SHAWCOR LTD.
- Current Assignee: SHAWCOR LTD.
- Current Assignee Address: CA ON Toronto
- Priority: CA2537348 20060222
- International Application: PCT/CA2007/000271 WO 20070222
- Main IPC: B32B37/00
- IPC: B32B37/00

Abstract:
Method of coating pipe having a raised weld bead. Curable resin polymer is applied to the pipe and allowed to bond to form a cured or partially cured polymer layer on the pipe. Powder form adhesive composition is applied on the polymer layer while hot, with fusion into a film bonding to the polymer. Powder form polyolefin is applied to the adhesive while hot with fusion into a film bonding to the adhesive to form a powder-based coating. Following forming of the powder-based coating, the pipe is cooled from the inside. An outer polyolefin covering is bonded to the powder-based coating and the pipe cooled to ambient temperature. This procedure can avoid voids, cavities or pinholes forming in the coating adjacent the weld bead.
Public/Granted literature
- US08038829B2 Coating method for pipe having weld bead Public/Granted day:2011-10-18
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