Appeal No. 1996-3195 Page 3
Application No. 08/228,086
piece of fabric with a polyurethane coating thereby
constructing the laminate sheet solely of the polyester fabric
on one side of the sheet and solely of the polyurethane
coating on a second side of the sheet;
forming the sheet in a tube configuration so that the
polyester fabric extends around an interior of the tube and
the polyurethane coating extends over an exterior of the tube;
folding the opposite edges of the polyester fabric back
so that the polyester fabric at the opposite edges is folded
back over itself and so that the pair of edges are aligned and
extending into the tube interior and the polyurethane coating
on each of the edges is in mutual contact; and
subjecting the contacting polyurethane coating of each of
the opposite edges to ultrasonic energy thereby securing the
opposite edges together and forming a seam along the laminate
tube that both securely joins the opposite edges of the sheet
together and seals the join of the edges solely by the
ultrasonically welded polyurethane coating in mutual contact
at the opposite edges.
15. A stitchless seam that is impervious to liquid, the
seam comprising:
a pair of adjacent pieces of a polyester fabric, each
piece of fabric having opposite interior and exterior surfaces
and each piece of fabric having an edge that is folded back so
that the edge extends out from the interior surface of the
piece of fabric;
a polyurethane coating on the exterior surface of each
piece of fabric, the polyurethane coating on the exterior
surfaces of the folded back edges being in mutual contact, and
the mutually contacting polyurethane coating being
ultrasonically welded thereby securing the folded back edges
together forming a seam in the pieces of fabric that both
joins the edges of the two pieces of fabric together and seals
the join of the edges solely by the ultrasonically welded
polyurethane coating.
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Last modified: November 3, 2007