Plastic bag forming machine
AssigneeViolet Hanson
InventorsViolet Hanson, Ralph Johnson
Life of this patent
Estimating the term…
Abstract
A method and apparatus for the automatic manufacture of flat bottom bags from a substantially continuous supply of a sealable material whereby the material is formed as a bag having a reinforced sealed flat bottom formed by an interior bag forming assembly that is cooperable with a relatively movable folder assembly that folds the bottom of the bag and removes it from the bag former assembly after a length of the bag is severed from the remainder of the material.
Claims23
In a machine for making and folding open top flat bottom bags from a heat sealable material,
- means on said machine supplying a continuous length of heat sealable material including means for feeding said material leading end first over a bag forming means,
- sealing means operable, on passing of said leading end and beyond said bag forming means, to form a closure seal at the leading end of said material,
- said bag forming means being operable to expand said material to form in the material opposed faces and opposed sides and a flat bottom for a bag including said opposed faces and sides,
- material severing means operable to sever at a distance spaced from the leading end a length of said material to form the open top of the flat bottom bag and to form a closure seal for the next succeeding bag,
- folding means operable in cooperation with said bag forming means to seal portions of the opposed sides to the flat bottom of the bag and to remove the severed length of material from said bag forming means while folding the flat bottom of the bag alongside at least a portion of the material severed, and
- means selectively controlling the sequence of operations of said bag forming means, folding means, sealing means and severing means.
In a machine for making flat bottom bags from a substantially endless sleeve of sealable material having opposed faces and opposed gussetted sides,
- seal means for forming a transverse seal to seal together the opposed faces and for including the gussetted sides in said transverse seal,
- a forming assembly on said machine including means interior of the transversely sealed sleeve having opposed faces operable from an inactive to an active position for opening the gussetted sides and for forming a flat bottom for a bag in which the gussetted sides form interior flaps to be sealed to the flat bottom of the bag,
- said forming assembly having seal means exterior of the sleeve cooperating with said interior means between its active and inactive positions,
- a folding assembly on said machine movable toward said forming assembly and having seal means cooperable with said interior means for sealing the gusset flaps to the flat bottom of the bag in a plane perpendicular to said opposed faces, and for thereafter folding the flat bottom of the bag against one of the faces of the bag parallel to the plane thereof, and
- means for severing the thus formed flat bag from the remainder of the length of the sleeve of the bag, and discharging said thus formed bag.
A method of forming a flat bottom bag of a sealable material comprising
- moving a continuous sleeve of the bag material and a bag forming assembly relative to each other,
- sealing the sleeve to enclose the bag forming assembly therein,
- operating the bag forming assembly to open the sleeve to form bag walls and a flat bottom for the bag including the seal,
- folding the flat bottom of the bag,
- cutting the sleeve to separate the folded flat bottom bag from the remainder of the sleeve,
- and removing the cut flat bottom bag from the bag forming assembly while folding the bag.
Dependencies are inferred from the claim text.