Appeal No. 96-3465
Application No. 07/848,856
1. A method of forming a bag from a sheet of material
comprising the steps of:
a) providing a mandrel having a plurality of protruding
needlelike members, said mandrel of a general longitudinal shape
approximately resembling the longitudinal shape of the bag;
b) wrapping said bag material having opposite edges around
said mandrel;
c) initially piercing at least one edge of said bag
material with said needlelike members to anchor the material to
the mandrel until said edges are adjacent to each other;
d) securing said bag material at said edges onto said
mandrel by clamping members;
e) retracting said needle-like members from said bag
material;
f) securing said edges of said bag material together.
3. A method for sealing an open end of cylindrically formed
material having an interior surface comprising the steps of:
a) inserting a heating element having a plurality of
heating parts into said open end;
b) expanding said heating parts within said open end into
contact with said interior surface of the cylindrically formed
material to cause the material at its open end to form
overlapping material layers;
c) pressing said overlapping layers onto said heating
element to melt said interior surface about an interior perimeter
of said cylindrically formed material;
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Last modified: November 3, 2007