Method and apparatus for making a continuous tube of flexible sheet material
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United States of America Patent
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Aug 3, 1993
Grant Date -
N/A
app pub date -
Feb 6, 1992
filing date -
Feb 7, 1991
priority date (Note) -
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Abstract
Method and apparatus for making tubes from flexible textile sheets by which a sheet is helically wound around two or more non-rotatable support bars. Feed rollers contacting two or more helical convolutions wind the sheet so that adjacent helical convolutions overlap and also maintain the tube upstream of the feed rollers in tension to progress the tube axially along the support bars. As the sheet is wound into helical form, successive helical convolutions are sewn together to form a continuous tube.
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