A method of forming a flexible container can include folding a web or sheet to define one or more gussets in one or more regions of the flexible container. The gusset can be a continuous gusset or can be an interrupted gusset, having a seal disposed in the gusset.

A rectangular-bottomed packaging bag (1) is a rectangular-bottomed packaging bag formed by folding a sheet material member and includes a rectangular shaped bottom (2) a front (3) and a rear (4) rising from two facing sides of the bottom (2), and a pair of sides (5) connecting the front (3) and the rear (4). The pair of sides (5) each include a first region (31) positioned on the front (3) side, a second region (32) positioned on the rear (4) side, a side joining portion (33) joining the first region (31) and the second region (32), and an inclined joining portion (34) inclined to the bottom (2) side from the side joining portion (33) toward one of the front (3) and the rear (4) and joining the sheet material member of the first region (31) and the second region (32) overlapping each other in a direction of thickness.

A trifold side seamed film produce bag includes a front wall and a back wall, first and second side edges sealed together and a seamless bag bottom. The bag is joined at the side edges to additional bags by a perforation. The bag is corona treated on at least one wall and promotional material is printed on the treated surface. The bags are folded to one third of their height to fit compact bag roll dispensers. The bags are folded in a Z-fold or C-fold configuration. The method includes manufacturing the bags and winding them onto cores or forming the bags into coreless rolls. An apparatus for forming the side seamed bags includes an extruder, a tubing flattener, a perforator, a sealer, a corona treater, a printer and a slitter. The treated, printed bags may be stored on rolls for later slitting into two bag streams and folding into thirds.

Non-durable self-supporting flexible containers.

A tamper evident plastic bag having a sheet folded to form opposing first and second panels and a bottom gusset. The bag includes a first seam and a second seam that cooperate with the panels and the gusset to form a content receiving region between the panels. A third seam secures the first panel to the second panel at a location between the first seam and the second seam forming two compartments of the content receiving region. An adhesive strip is disposed on an internal surface of the first panel, and the strip being positioned opposite an opposing portion of an internal surface of the second panel. When a protective strip is removed, and the adhesive strip is brought into contact with the opposing internal surface of the second panel, a seal is formed that closes the plastic bag, forming a vent between the first seam and the seal.

A method for sealing and cutting of a flexible material for forming a flexible container comprising a product volume and at least one structural support volume can include feeding at least two flexible material into a sealing apparatus comprising a sealing surface and an opposed anvil surface; contacting a seam region of the at least two flexible material with the sealing surface to form a seal in the seam region and cut the seal to form a seam in a single unit operation. The seal defines one or both of at least a portion of a boundary of the product volume and at least a portion of a boundary of the at least one structural support volume.

A method of filling a product volume of a flexible container that includes a product volume and a structural support volume that at least partially extends into the product volume can include filling the product volume with product and applying an external force to the product volume and sealing the product volume to reduce a product receiving volume of the product volume.

Provided herein are storage bags having an opening to an interior thereof formed by pliable front and back panels each comprising outwardly curved upper portions and rectangular lower portions having first and second straight side edges, straight bottom edges and outwardly curved top edges that are sealed together along respective side and bottom edges and means for sealing and opening the bag. The storage bag may comprise first and second seamed edges that are equal in length with the outwardly curved top edges extending therefrom. Alternatively, the storage bag may comprise a first seamed edge that is shorter than the second seamed edge with the outwardly curved top edges extending therefrom.

A fluid protection assembly for includes a bag that has a top wall, a bottom wall, a first flap and a peripheral wall extending between the top wall and the bottom wall. The bottom wall may be positioned on a support surface and the bag may insertably receive an object when the first flap is positioned in an open position. The top wall is drawn upwardly and over the object such that the bag envelopes the object and the bag is comprised of a fluid impermeable material. A closure is attached to the bag and the closure closes the first flap. A plurality of first ties is coupled to the top wall. A plurality of second ties is coupled to the top wall and the second ties are tied to the first ties.

The disclosure is directed to sampling bags having flexible walls. The sampling bags may have agile walls that include a shape memory component. The shape memory component tends to return the sampling bag to its initial shape. Such sampling bags may be used in a variety of sampling methods.