Stock material or miscellaneous articles – Structurally defined web or sheet – Edge feature
Patent
1989-02-22
1990-07-31
Seidleck, James
Stock material or miscellaneous articles
Structurally defined web or sheet
Edge feature
138156, 174DIG8, 219535, 219549, 428 351, 428 349, 428225, 428226, 428245, 428293, 428343, H05B 310
Patent
active
049449877
ABSTRACT:
The invention relates to a heat-recoverable covers which comprises embedded electrical resistance heaters, and to methods of covering an elongate object using such covers.
In a preferred embodiment, the cover comprises a heat-recoverable polymeric sheet (22) or fabric, provided with upstanding rails (24,25) as a first closure means. A heating element (36) is embedded in the sheet, and arranged to follow a serpentine path such that each return loop portion 38 projects beyond the edges of the cover. The sheet is coated on its inner surface with a layer of adhesive and/or sealant (28,30).
In use, the cover is wrapped around a substrate (32) at least once, and first and second closure means (24,25 and 26,27) are engaged to hold the cover in the wrapped configuration. The cover is then heated to cause the cover to recover, and the adhesive and/or sealant to form a seal.
REFERENCES:
patent: 3467761 (1969-09-01), Plummer
patent: 4323607 (1982-04-01), Nishimura et al.
patent: 4369356 (1983-01-01), Tsurutani et al.
patent: 4384906 (1983-05-01), Molinari et al.
patent: 4412125 (1983-10-01), Nagasawa et al.
patent: 4472222 (1984-09-01), Moisson et al.
patent: 4675512 (1987-09-01), Doucet et al.
"Welded Polyethylene Splice Closures A Reliable Alternative", by D. F. Gill, Dec. 1983.
Cordia Johannes M.
Evans Roger W.
Van Loo Robert H.
Burkard Herbert
N. V. Raychem S. A.
Rice Edith A.
Seidleck James
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