Abstract Lightweight pipe having a plastic core and a fibrous wrapping is obtained by first coating the core with a composition containing a polymerizable liquid resin, typically a polyester resin, and an accelerator therefor. Thereafter fibrous material in bundles, impregnated with a substance such as the liquid resin composition, is applied to the resin-bearing core, along the axis of the core, with adjacent bundles being spaced apart. Catalystimpregnated additional fibrous material is then wound about the intermediate fiber-and-resin-bearing article. This wound article is next wrapped with fibrous mats impregnated with the liquid resin composition or the like and is subsequently wrapped with plastic film. The resulting article has enhanced burst strength and is particularly useful in irrigation.
Inventors
👤 Pietro L Serafino
👤 Pietro L Culla
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-31 11:56
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; F16L9/123
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
The method of claim 1 wherein said resinous mass for said coating is poured down onto the advancing core, at least a portion of said first fibers are impregnated in unstressed condition, are axially applied under tension, and are spaced apart one from the other along resin-bearing plastic core, and adjacent second fibers contact one another thereby forming a continuous, fibrous winding about said pipe and axially applied fibers while contacting said pipe between spaced apart first fibers.
Claim 2
Dependent Claim
57 words
The method of claim 1 wherein the pipe and axially applied fibers are wound with more than one layer of second fibers, the second fibers are impregnated with liquid material comprising polymerizable liquid resin and a catalyst for said resin, and said mat material is impregnated with a catalyst for the resin contained in said mat material.
Claim 3
Dependent Claim
60 words
The method of claim 1 wherein said intermediate article is wrapped longitudinally along said article with more than one layer of fibrous mat material, and at least alternate layers of said mat material are impregnated with a liquid composition containing a catalyst for the resin in said material, whereby resin in the wrapped mat material contacts catalyst for said resin.
Claim 4
Dependent Claim
57 words
The method of claim 1 wherein the resinous mass of said coating and the resinous mass impregnating said first fibers are the same, the intermediate article is covered with mat material during polymerization of resin present in said article, and the mat-covered article is wrapped with plastic film during polymerization of resin present in said mat-covered article.