Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1996-07-30
1998-11-03
Stryjewski, William
Pipes and tubular conduits
With closures and plugs
Inflation stem type
138 94, 138 97, F16L 5510
Patent
active
058294821
ABSTRACT:
A method of plugging up a coating material introduction aperture formed on a hollow structural member, the hollow structural member being coated with a coating material through dip coating and then heated to bake the coating material coated thereon, which includes the steps of providing a plug having a coating material introduction passage and formed of a foamable material which is foamable by heat at the time the hollow structural member is heated to bake the coating material coated thereon, inserting the plug as unfoamed into the coating material introduction aperture before the hollow structural member is coated with the coating material through the dip coating, and heating the plug to produce a foamed product so as to plug up the coating material introduction aperture. The step of heating the plug is performed by heat which is applied to the hollow structural member for baking the coating material coated thereon.
REFERENCES:
patent: 4989913 (1991-02-01), Moore, III
patent: 5213391 (1993-05-01), Takagi
patent: 5320460 (1994-06-01), Murakami et al.
patent: 5327942 (1994-07-01), Black
patent: 5622211 (1997-04-01), Martin et al.
NEO-EX Lab. Inc.
Stryjewski William
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