Insulation tubes and process of making same

Details Insulation tubes and process of making same Insulation tubes and process of making same

1979-01-15

1980-12-16

Dixon, Jr., William R.

Pipes and tubular conduits

Spirally seamed

138129, 156190, 156195, 428 36, 428212, 428222, F16L 916, B65N 8100, D03D 1300

Patent

active

042390648

ABSTRACT:
A discrete tube is provided which can be readily torn into a length of coiled insulation wrapping. The tube comprises at least two plies of a firm, foamed thermoplastic polymer web which has been set into a coiled configuration. The plies are welded together on their radially facing adjoining surfaces to form the tube, but the plies are offset and the axially facing edges of each ply are not welded together, such that the non-welded edges form a junction line along a central portion of the radially facing edge of the adjacent ply.
The tube is preferably formed by heat sealing the two plies together, while simultaneously heat setting each ply into the coiled configuration. The laminated coil resiliently maintains the desired configuration.

REFERENCES:
patent: 3247869 (1966-04-01), Boegerhausen et al.
patent: 3616123 (1971-10-01), Reynolds et al.
patent: 3654061 (1972-04-01), Berwanger
patent: 3716435 (1973-02-01), Jensen et al.

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