A packaging unit for producing sealed packages from a tube fed along a first direction and comprising one pair of jaws, which grip the tube along transverse sections, defining respective second directions crosswise to the first direction; sealing means, which seal transverse sections to form sealed packages; separating means for separating packages from the tube along transverse sections and comprising one knife movably supported by one jaw; driving means moving the knife with respect to the jaw along a plane crosswise to the first direction and between a resting position, in which a cutting edge of the knife is spaced from the tube and is aligned with the respective second direction defined by the transverse section to be cut, and an operating position, in which the knife has completely cut the tube at the transverse section; driving means move the cutting edge obliquely with respect to the second direction when said driving means move the knife from the resting position to the operating position; cutting edge contacts the transverse section along a cutting surface parallel to the second direction and increasing as the knife moves from the resting position to the operating position.

A tensioning device for a chain driven jaw system in a package filling machine is disclosed. The chain driven jaw system has a fixed cam and a chain as a follower. The tensioning device comprises a chain tensioning element shaped and angled so to receive the chain on an outer surface thereof configured to be directed away from a center of the chain driven jaw system, wherein the chain tensioning element comprises a pivot connection, and wherein the chain tensioning element is configured to be integrated with the fixed cam at the pivot connection such that the chain tensioning element abuts the fixed cam at the pivot connection and can move to tension the chain. A chain driven jaw system and a related method is also disclosed.

The disclosure relates to a power-transfer unit for a sealing unit of a packaging machine comprising a support, intended to be attached to a sealing unit, a power bar comprising a contact-initiation section, a contact-termination section, and an intermediate section therebetween, the power bar being resiliently suspended in the support and being movable along a first direction being normal to a contact surface of the intermediate section. The power bar is suspended in the support by a first leaf spring.

A sealing station configured to heat seal a wall made from heat-sealable film material, preferably metal-free heat-sealable film material, onto one another wall of heat-sealable material, e.g. another wall of heat-sealable film material, to create a sealed seam. The sealing station comprises an impulse sealing device comprising a first jaw and a second jaw, wherein at least the first jaw comprises at the respective front surface thereof at least one, e.g. a single elongated, impulse heatable member that extends along the respective front surface and that is covered by a heat-resistant non-stick covering.

A tensioning device for a chain driven jaw system in a package filling machine is disclosed. The chain driven jaw system has a fixed cam and a chain as a follower. The tensioning device comprises a chain tensioning element shaped and angled so to receive the chain on an outer surface thereof configured to be directed away from a center of the chain driven jaw system, wherein the chain tensioning element comprises a pivot connection, and wherein the chain tensioning element is configured to be integrated with the fixed cam at the pivot connection such that the chain tensioning element abuts the fixed cam at the pivot connection and can move to tension the chain. A chain driven jaw system and a related method is also disclosed.

There is disclosed a sonotrode comprising: a head which defines a sealing surface elongated along a first direction orthogonal to a second direction and at least one first slot which extends through the head transversally to the first direction; the first slot extends parallel to a third direction inclined to both the first direction and the second direction; the first direction defines an acute angle with the second direction.

A sealing station configured to heat seal a wall made from heat-sealable film material, preferably metal-free heat-sealable film material, onto one another wall of heat-sealable material, e.g. another wall of heat-sealable film material, to create a sealed seam. The sealing station comprises an impulse sealing device comprising a first jaw and a second jaw, wherein at least the first jaw comprises at the respective front surface thereof at least one, e.g. a single elongated, impulse heatable member that extends along the respective front surface and that is covered by a heat-resistant non-stick covering.

A sealing station configured to heat seal a wall made from heat-sealable film material, preferably metal-free heat-sealable film material, onto one another wall of heat-sealable material, e.g. another wall of heat-sealable film material, to create a sealed seam. The sealing station comprises an impulse sealing device comprising a first jaw and a second jaw, wherein at least the first jaw comprises at the respective front surface thereof at least one, e.g. a single elongated, impulse heatable member that extends along the respective front surface and that is covered by a heat-resistant non-stick covering.

A continuous rotary heat-sealing machine, particularly for joining heat-sealable films, papers or ribbons, which comprises a frame provided with at least one first pair of rotating shafts and at least one second pair of rotating shafts, the machine comprising at least one pair of tracks, each one mounted on a shaft of the first pair of rotating shafts and on a shaft of the second pair of rotating shafts, the tracks being arranged substantially in contact with each other, rotating in opposite directions, and being adapted to create a pressure plane.