Protective wrapping material

Details Protective wrapping material Protective wrapping material

1989-09-27

1991-01-08

Bell, James J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428225, 428226, 428229, 428246, 428247, 428291, 428489, 428914, 138129, B32B 700

Patent

active

049834495

ABSTRACT:
A continuous strip non-shielding and pressure-resistant wrapping material for protecting buried metallic pipe is disclosed. The wrapping material comprises a continuous layer of cold-flowable rubberized bitumen bonded to a substantially non-elastic porous support backing with a release film positioned on the exposed face of the bitumen to protect the bitumen prior to application. When applied to a metallic pipe, the protective bitumen is secured to and held in place by the non-elastic support backing and thus cannot sag away from the pipe. The porous support backing provides potential electric current paths through each pore so that cathodic protection can be effectively utilized to protect against corrosion in even the smallest holiday in the bitumen layer.

REFERENCES:
patent: 2828798 (1958-04-01), Hopkins et al.
patent: 3721578 (1973-03-01), Bennett et al.
patent: 4107375 (1978-08-01), Iwasaki et al.
patent: 4386981 (1983-06-01), Clapperton
patent: 4405680 (1983-09-01), Hansen
patent: 4714651 (1987-12-01), Hartmann et al.
patent: 4789578 (1988-12-01), Twyford et al.

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