Hot applied coatings
AssigneeWinn & Coales (Denso) Limited
InventorsWilliam D. Parker, Harry M. Smith, Margaret P. Edwards
Life of this patent
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Abstract
A method for forming an adherent protective coating on articles, particularly pipes for burial in the ground where they will be subject to corrosion, which comprises wrapping a hot impregnated fabric strip spirally around the article, the said fabric, which is preferably of glass fibre, being impregnated with a hot, molten adhesive, e.g. coal tar or bitumen and forming a sheathing of a plastics material bonded to the impregnated fabric, preferably by winding a strip of polyvinyl chloride sheet over the wrapped article.
Claims10
A method for forming a protective coating on a pipe which method comprises wrapping a hot fabric strip helically over the pipe, the said fabric strip having been previously impregnated with a hot, molten adhesive, and wrapping a strip of plasticized polyvinyl chloride sheet under tension over the hot fabric wrapping to form a sheathing.
A method for forming a protective coating on a steel pipe which method comprises heating the pipe, priming the pipe, wrapping a hot, impregnated glass fibre fabric strip helically around the hot pipe with an overlap between successive turns of at least 10%, the fabric strip having been impregnated by being passed through a bath of molten adhesive selected from the group consisting of asphaltic bitumen coal tar and rubber containing asphaltic bitumen and coal tar, and helically winding under tension a strip of plasticised polyvinyl chloride sheet coated with the said adhesive over the impregnated fabric whilst the fabric is hot to form a sheathing.
Dependencies are inferred from the claim text.