Tubular plastics objects
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United States of America Patent
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-
Jan 28, 1986
Issued Date -
N/A
app pub date -
May 5, 1983
filing date -
Oct 13, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The formation of tubular objects by spirally winding and seaming a relatively rigid strip of plastics material. A sealing flap (15, 215) along one longitudinal edge (5, 25) of the strip, and an engaging surface (16, 216) along the other edge (11, 211) positioned close to but separate from the interlocking portions (8 and 12, 28, 212) of these longitudinal edges. The provision of these sealing flaps and engaging surfaces permit the interlocking portions at the edges to be designed independent of the ability of these interlocking portions to create a fluid seal. This results in optimum operation of these interlocking portions to, for example, permit relatively rapid changes in the diameter of the tube as it is formed, as well as subsequent to its formation.
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