Method of producing a flexible tubular lining
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United States of America Patent
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Feb 15, 1994
Grant Date -
N/A
app pub date -
Sep 17, 1992
filing date -
Mar 10, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The manufacture of flexible tubes of two or more layers of a material such as felt which can absorb synthetic resin comprises feeding a first web in the direction of its length and folding the web so that its edges came face-to-face and are sewn together by stitches which loop round said edges, the second layer being wrapped around the first and its edges sewn in a similar manner, the looped stitching being such that when the tube is inflated to circular form the extremities of the edges in the stitching loops in each layer come into butting contact, whereby there are no regions where the layer has a double thickness of material.
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