A machine for welding an overlapped region of two adjacent strips of material and a method of using the same. The machine includes a housing with front and rear ends, a wheel train engaged with the housing for moving the housing across the material; a nozzle on the housing having a welding head at a free end; the nozzle being positionable at least partially beneath the housing's bottom wall for welding the overlapped region; front and rear pressure rollers engaged with the housing, where the front roller is positioned forwardly of the welding head and the rear roller is positioned rearwardly of the welding head; wherein the rear pressure roller applies pressure to the overlapped region when the wheel train moves the housing in a forward direction; and the front pressure roller applies pressure to the overlapped region when the wheel train moves the housing in a reverse direction.

An apparatus for fabricating an elastic nonwoven material generally includes a rotary ultrasonic horn and a rotary anvil positionable in close proximity to the ultrasonic horn. The anvil has a face with a width and a circumferential axis. The face has a plurality of ridges each of which defines a plurality of interspaced lands and notches.

The invention relates to improvements of a vertical flow-wrapper, for producing tubular bags from a foil web, with a frame/housing, at which a form-fill-tube, a longitudinal-sealing means and a cross-sealing means and a cutting means are provided.

A sealing jaw for use with a bagging apparatus including a removable jaw having a guide/retention member selectively releasable from a jaw holder. The jaw holder including a modular retainer assembly having a release member movable between a first position for securing the guide/retention member therewith, and a second position for releasing the guide/retention member therefrom. Selective release of the guide/retention member from the jaw holder is achieved without tools.

A heating and sealing head (1) for packaging machines (M.sub.1; M.sub.2; M.sub.3) of products in trays (V), comprising a fixed support group (2) provided with first actuation means (3) electrically connected to a pneumatic system (4) for delivering compressed air, and a mobile application group (5) mechanically coupled to the fixed support group (2) by means of first fixing means and comprising heating means (6) electrically connected to an electric current generator (7), preferably alternating, which activates the heating means (6) to produce heat useful for sealing a closing and packaging film to one or more trays for containing products when the trays themselves are arranged under the heating and sealing head (1) in a packaging machine (M.sub.1; M.sub.2; M.sub.3). In particular, the heating means (6) comprise an electromagnetic inductor body (8) which produces the heat due to the effect of the parasitic electric currents induced by a magnetic field generated by the electromagnetic inductor body (8) when crossed or affected by the electric current.

An apparatus for fabricating an elastic nonwoven material generally includes a first bonding module, a second bonding module positioned in close proximity to the first bonding module, and a pinching device. The first bonding module and the second bonding module are adapted to bond at least one elastic strand of the elastic nonwoven material. The pinching device is adapted to limit a snap-back potential of the at least one elastic strand if the at least one elastic strand becomes severed during bonding.

An apparatus for fabricating an elastic nonwoven material generally includes a first bonding module, a second bonding module positioned in close proximity to the first bonding module, and a pinching device. The first bonding module and the second bonding module are adapted to bond at least one elastic strand of the elastic nonwoven material. The pinching device is adapted to limit a snap-back potential of the at least one elastic strand if the at least one elastic strand becomes severed during bonding.

A bagging apparatus including a first jaw, a second jaw, at least one of the first jaw and the second jaw being movable. The first jaw and second jaw are movable relative to each other between a first position for joining at least a portion of two sheets together and a second position associated with release of the two sheets, the two sheets forming at least a portion of a bag. At least one of the first jaw and the second jaw being removable from the apparatus without tools.

A system holds a roll of film that includes a core and film wound around the core. The system includes a rod having an outer diameter that is smaller than an inner diameter of the core, a proximal wing located on the rod and configured to rotate about the rod, and a distal wing located on the rod and configured to rotate about the rod. Each of the proximal and distal wings includes contact surfaces configured to contact diametrically-opposed locations on a side of an inner surface of the core and non-contact surfaces that span between the contact surfaces of the wing. The non-contact surfaces of the wings do not contact the core if the core has a cylindrical shape. The distal wing is capable of rotating around the rod independently of the proximal wing.

A loose stack joint and/or cracked ultrasonic stack component of an ultrasonic stack of an ultrasonic device are detected by measuring a test damping coefficient with a test scan of the ultrasonic stack. The test damping coefficient is compared with a previously measured baseline damping coefficient. It is determined that the ultrasonic stack has a loose stack joint and/or a cracked ultrasonic stack component when the damping coefficient is greater than the baseline damping coefficient by more than a predetermined amount.