Abstract: A station for the application of segments of openable/reclosable strip on a plastic film web destined to form bags, includes a device for sealing segments of strip at intervals on the film and a device for punching predefined zones of film. The punching device and the sealing device are positioned in the station along the film path to act in sequence in the same zone for punching the film and sealing the segments in the predefined points of the film keeping the film stationary between the film punching operation and the corresponding operation for sealing a segment on the film.

Abstract: To provide for continuous feed of a packaging film, the film into a tube, filling the tube into packages and severing the packages, markers are located longitudinally along the film for example of plastic; the film is fed and formed into a tube by a pulling mechanism, the drive of which is synchronized with the bag-forming operation as such, that is, sealing and severing tube portions, under control of the markers so that slippage between drive rollers or units and the film being fed or inaccuracies in operation of the filling mechanism are immediately compensated by change in speed of the drive unit or operation of the filling and bag-forming mechanism to maintain relative alignment of bag closing with respective areas on the film, preventing accumulation of positioning errors and hence possible misalignment of printed information on the film with respect to the closing seams of the bag.

Abstract: To fill low-weight, high-volume goods, such as potato chips, popcorn and the like into bags as the bags are being made, the fill goods are introduced into a hopper and a filling funnel which is joined to a fill tube. The fill tube has air inlet openings at the upper portion, air outlet openings at the lower portion, and then continues to a holder and bag-forming tube. A film (102), for example, of plastic, is wrapped about the bag forming tube (105), and seamed vertically, so that the tube is being made as goods are introduced into the hopper and funnel. An air stream (B) is generated longitudinally in the fill tube (103) by introducing air under above-atmospheric pressure into the upper air inlet openings (104) formed as downwardly directed flap nozzles (119), the air being removed from lower openings (122) and, for example, recirculated in the recirculating blower (107), the openings being closed off outwardly by a jacket forming respective air inlet and outlet chambers (111,116).

Abstract: To provide for uniform pressure, under predetermined conditions, of application of closure sealing jaws for a bag making machine, to close thermoplastic tubular foils, a hydraulic pressure element (7;26,28) applies the pressure of a pressure jaw (1) against another (2), with the foil interposed; the hydraulic pressure is sensed by a transducer (11), converted into an electrical signal and compared with a command set signal (22), any error or deviation being fed back in a closed loop to a servo positioning valve (13,15) to thereby set the hydraulic pressure with which the movable jaw (1) is applied against a fixed jaw (2) in accordance with commanded value.