Patent ID: 7238253
Filing Date: 2007-07-03
Classification: B31B,B65D,Y10T

Abstract:
1. The method of manufacturing a bag, which comprises: (1) placing bag blanks onto a conveyor with the individual bag blanks spaced uniformly along the conveyor, each bag blank having a body formed of opposing sidewalls having top and bottom ends and side edges; (2) automatically applying an opening tab by a tab applicator to at least one sidewall of each bag blank at a location between the top and bottom ends and between the side edges of such bag blank as such bag blank is moved continuously by the conveyor past the applicator; (3) automatically applying two lengths of closure strips to the opposite sidewalls of the bag blanks, respectively, in directly opposed relationship and adhered to the respective sidewalls as the bags are moved continuously by the conveyor, whereby the closure strips extend sideways across a bag blank and between adjacent blanks on the conveyor; (4) while the bag blanks with applied closure strips continue to be moved by the conveyor, automatically severing opposed closure strips at locations between adjacent bag blanks, whereby the bag blanks are separated from each other, including severing opposed and abutting closure strips at locations between adjacent bags by a cooperating knife and anvil while moving the knife and anvil at the speed of movement of the bag blanks by the conveyor, and reciprocating the knife and anvil from an upstream position to a downstream position, severing the closure strips while movement of the knife and anvil in the downstream direction, and reciprocating the knife and anvil back to the upstream position; and (5) discharging the bag blanks from the conveyor with the applied tabs and closure strips.