Multi-purpose sealing module (20) for machine (10) to manufacture heat-sealed plastic film based bags comprises a servo motor driven common drive shaft (30) in keyed connection with eccentric cams (40a, 40b) and (50a, 50b) such that eccentricity is equal and in opposite directions. Crank arms (60a, 60b) are connected to the eccentric cams (40a, 40b) though bearings (80a, 80b) and through bearings (120a, 120b) to linear guide rods (100a, 100b). Linear guide rods (100a, 100b) are in rigid connection with upper seal beam (140). Crank arms (70a, 70b) are connected to the eccentric cams (50a, 50b) though bearings (90a, 90b) and through bearings (130a, 130b) to connecting rods (110a, 110b). Connecting rods (110a, 110b) are in rigid connection with lower seal beam (150). Movement of lower seal beam (150) is guided by linear guide rods (100a, 100b). Angular movement of common drive shaft (30) gives simultaneous linear movement in opposite directions to upper seal beam (140) and lower seal beam (150) controlling the gap between a sealing jaw connected to upper seal beam (140) and a sealing jaw connected to the lower seal beam (150). Seal time and seal pressure of sealing of plastic film based bags and pouches; and angular movement of the drive shaft (30) are controlled by a programmable controller.

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.

A method (100) for making a flat bottom bag (800) with a valve (28) is provided. The method (100) includes overlapping and sealing the two longitudinal edges (11a and 11b) of a web (10) to form a continuous tube (12). The method includes cutting-off the continuous tube into tube pieces (14) in accordance with desired bag length such that each tube piece (14) has at least a first open end (18) and a second open end (22). The method (100) includes forming a first pair of flaps (F1, F2) and a second pair of flaps (F3, F4) on the first open end (18) and the second open end (22) respectively. The method (100) includes providing a valve (28) on the second pair of flaps (F3, F4) on the second open end (22). The method (100) includes folding and flattening both the pairs of flaps (F1, F2 and F3, F4) so that the edges of the flaps meet at the centre. The method (100) includes sealing a pre-cut cover patch (30) onto the folded and flattened pairs of flaps (F1, F2 and F3, F4) to close the open ends (18, 22).

Score lines are formed on package material. A spout attachment hole is formed in a portion corresponding to a top gusset section of a pouch. A spout is attached to the spout attachment hole. A portion corresponding to a peripheral edge of the top gusset section of the pouch and a portion corresponding to a top edge of a body section of the pouch are heat-sealed, and the package material is cut in the width direction. Portions corresponding to side edges of the body section of the pouch are heat-sealed, and a portion corresponding to a peripheral edge of a bottom gusset section and a portion corresponding to a peripheral edge of a bottom end portion of the body section are heat-sealed. The heat-sealed portions formed at the portions corresponding to the side edges of the body section of the pouch are cut so a spouted pouch package is released.

A gusset bag (10), having a pair of flat surface portions (11, 11) facing each other and a pair of side surface portions (12, 12) facing each other which are folded toward the inside, has a side edge sealing portion (13) in which the flat surface portion and the side surface portion are heat-sealed together at side edge portions thereof, and a folded-back portion (13c) in which all or a part of the side edge sealing portion in the width direction is folded back toward the flat surface portion or the side surface portion. The gusset bag and a spout-attached gusset bag (1) using the gusset bag have an excellent self-standing property, and causes one's hand to feel little pain even when being squeezed.

A container body includes a bag body and a resealable lock. The bag body includes first and second layers overlapped with each other, wherein the bag body further has a plurality of sealing portions provided thereat to form first and second sealing pockets discretely provided between the first and second layers, wherein three of the sealing portions are provided at three sealing edges of the first sealing pocket and three of the sealing portions are provided at three sealing edges of the second sealing pocket, such that each of the first sealing pocket and the second sealing pocket has an unsealed edge to serving as an elongated opening. The resealable lock includes a plurality of zip lockers provided at the elongated openings of the first and second sealing pockets, wherein each of the first and second sealing pockets is reclosably sealed by the resealable lock.

A process of manufacturing a roll of plastic bags. The process includes forming a tubular blown film, and collapsing the tubular blown film so that the tubular blown film includes a first side, a second side, a first edge, and a second edge. Openings are cut in the collapsed tubular blown film, and sealing closure mechanisms are inserted through the openings into the collapsed tubular blown film. The sealing closure mechanisms are then fixed to the collapsed tubular blown film.

Multi-purpose sealing module (20) for machine (10) to manufacture heat-sealed plastic film based bags comprises a servo motor driven common drive shaft (30) in keyed connection with eccentric cams (40a, 40b) and (50a, 50b) such that eccentricity is equal and in opposite directions. Crank arms (60a, 60b) are connected to the eccentric cams (40a, 40b) though bearings (80a, 80b) and through bearings (120a, 120b) to linear guide rods (100a, 100b). Linear guide rods (100a, 100b) are in rigid connection with upper seal beam (140). Crank arms (70a, 70b) are connected to the eccentric cams (50a, 50b) though bearings (90a, 90b) and through bearings (130a, 130b) to connecting rods (110a, 110b). Connecting rods (110a, 110b) are in rigid connection with lower seal beam (150). Movement of lower seal beam (150) is guided by linear guide rods (100a, 100b). Angular movement of common drive shaft (30) gives simultaneous linear movement in opposite directions to upper seal beam (140) and lower seal beam (150) controlling the gap between a sealing jaw connected to upper seal beam (140) and a sealing jaw connected to the lower seal beam (150). Seal time and seal pressure of sealing of plastic film based bags and pouches; and angular movement of the drive shaft (30) are controlled by a programmable controller.