Method and apparatus for manufacturing a bag having an indent bottom wall
AssigneePolymer Packaging, Inc.
InventorsWilliam E. Post, Larry L. Lanham
Life of this patent
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Abstract
A method and apparatus for forming a bag provides a tube of material that is passed over a former. A portion of the tube is folded over the former to define the rim of the bag. Portions of the rim are then welded. The apparatus includes arms that move transverse to the tube. The arms carry crimping fingers that pivot to fold the tube up and in over the former.
Claims25
A method of forming a bag comprising the steps of:
- (a) providing a tube of material that will be used to form the body of the bag;
- (b) positioning the tube of material about a former;
- (c) closing a portion of the tube to form the bottom closure seam of the bag;
- (d) folding a portion of the closed tube around a portion of the former to define a rim and a bottom wall by pivoting crimping fingers into the closed portion of the tube;
- and
- (e) welding at least one portion of the rim.
A method of forming a bag comprising the steps of:
- (a) providing a tube of material that will be used to form the body of the bag;
- (b) positioning the tube of material about a former that defines a weld opening;
- (c) closing a portion of the tube below the former to form the bottom closure seam of the bag;
- (d) moving the former up with respect to the tube of material after step (c);
- (e) providing at least one crimping and welding arm that moves transverse to the longitudinal direction of the tube;
- (f) moving the crimping and welding arm inwardly with respect to the tube while folding a portion of the closed tube around a portion of the former to define a rim and a bottom wall;
- (g) trapping a portion of the rim between a portion of the crimping and welding arm and the former at the location where the former defines the at least one weld opening;
- and
- (h) welding the portion of the rim positioned at the at least one weld opening of the former.
An apparatus for forming a bag having an indented bottom wall and a welded rim;
- the apparatus comprising:
- means for providing a tube of material;
- a former having at least one weld wall that defines at least one weld opening;
- the tube of material being positioned around the former;
- and
- at least one arm movable inward from the side of the tube to fold a portion of the tube about the weld wall of the former.
A method of forming a bag comprising the steps of:
- (a) providing a tube of material that will be used to form the body of the bag;
- (b) positioning the tube of material about a former;
- (c) closing a portion of the tube to form the bottom closure seam of the bag;
- (d) moving the former upwardly with respect to the tube of material after step (c);
- (e) indenting the closed tube around a portion of the former to define a rim and a bottom wall;
- and
- (e) welding at least one portion of the rim.
A method of forming a bag comprising the steps of:
- (a) providing a tube of material that will be used to form the body of the bag;
- (b) positioning the tube of material about a former;
- (c) using a sealer to close a portion of the tube to form the bottom closure seam of the bag below the former;
- (d) moving the sealer downwardly and outwardly with respect to the tube of material after step (c);
- (e) indenting the closed tube around a portion of the former to define a rim and a bottom wall;
- and
- (e) welding at least one portion of the rim.
Dependencies are inferred from the claim text.