Method of making a spirally-wound tube

Details Method of making a spirally-wound tube Method of making a spirally-wound tube

2005-09-06

2005-09-06

Aftergut, Jeff H. (Department: 1733)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C156S192000, C156S195000, C156S244130, C156S425000, C156S429000

Reexamination Certificate

active

06939424

ABSTRACT:
This invention concerns a method and an apparatus for making a spirally-wound tube from a hollow thermoplastic profile (1) having a substantially rectangular cross-section, which method comprises the steps of: winding the thermoplastic profile (1) around a drum (2) and joining adjacent loops together by welding, and smoothing the outer weld joint (13) by means of extra heat and a smoothing body resting against the weld joint (13). The invention is characterized in that the thermoplastic profile (1), when fed to the drum (2), comes onto a stationary first section (3) comprising spaced sliding means (5) arranged along the periphery, on which section welding is performed, after which an inner weld joint (11) thus formed is arranged to run along a spiral groove (14) running around the stationary first section (3), whereby the inner weld joint (11), as well as the outer weld joint (13), are treated by using extra heat and a stationary smoothing body (10) resting against it, and that the tube, once both of the welded surfaces (11, 13) have been smoothed, is transferred to a rotary driven drum section (4) causing the tube to rotate and generating the winding motion of the thermoplastic profile (1).

REFERENCES:
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patent: 4033808 (1977-07-01), Petzetakis
patent: 4575400 (1986-03-01), Ueda et al.
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patent: 5261988 (1993-11-01), Dikis et al.
patent: 5591292 (1997-01-01), Blomqvist
patent: 6105649 (2000-08-01), Levingston et al.
patent: 6209607 (2001-04-01), Foos
patent: 8192472 (1996-07-01), None
patent: WO 93/22126 (1993-11-01), None

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