Tubes and method and apparatus for producing tubes
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United States of America Patent
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Oct 22, 2013
Grant Date -
Feb 4, 2010
app pub date -
Aug 3, 2009
filing date -
Feb 1, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A system and method for producing flat tubes is described and illustrated. The flat tubes can be produced from at least one strip of endless band material having at least one wall part and an inner part formed with corrugations on a roller train provided with roller pairs, with the strip running in a longitudinal direction through the rollers and being shaped. The inner part of the flat tube can be formed with corrugations placed between the shaped wall parts, after which the closure of the flat tube is carried out. Production of the flat tubes can include forming spaced apart band thinning lines running in the longitudinal direction of the strip, and forming corrugation peaks and corrugation troughs at the band thinning lines.
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