Hollow cylindrical body made from spirally wound extruded plasti

Details Hollow cylindrical body made from spirally wound extruded plasti Hollow cylindrical body made from spirally wound extruded plasti

1988-05-23

1990-02-27

Bryant, III, James E.

Pipes and tubular conduits

Spirally seamed

138122, 138129, 428192, F16L 916, B23B 304

Patent

active

049037366

ABSTRACT:
For the production of a hollow cylindrical body, for example a tube or a container, first a bottom channel (1) is wound spirally onto a mandrel. A top channel (2) is wound on to the bottom channel (1) offset by half the channel width. The top and bottom channel (1, 2) both have an approximately E-shaped cross section with two outside flanges (3, 4) and two middle flanges (5, 6). The distance between the two middle flanges (5, 6) correspond to the combined thicknesses of the two outside flanges (3, 4). The confronting surfaces (7, 8) of the two outside flanges (3, 4) and of the two middle flanges (5, 6) are provided with a sawtooth cross-sectional shape, so that an inseparable, interlocking connection results between the bottom channel (1) and the top channel (2). The bottom channel (1) and top channel (2) can consist of different plastic materials.

REFERENCES:
patent: 2731040 (1956-01-01), Warburton
patent: 4167645 (1979-09-01), Carey
patent: 4435460 (1984-03-01), Menzel
patent: 4719945 (1988-01-01), Richards et al.

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