A machine and method for making bags is described and includes a web traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a first sealing zone, and an adjacent weakening zone. The weakening zone may be a heated perforator, includes a heating wire, or be disposed to create an auxiliary sealed area. The heating wire can have connected thereto, a source of power that is an adjustable voltage or magnitude, and/or pulsed, and/or a feedback loop. The heating wire ay be an NiCr wire and make intermittent contact with the web and be disposed in an insert. The weakening zone may create a line of weakness that is uniform or varies in intensity, is a separating zone, or includes a heat film, a toothed blade, a row of pins, a source of air, or a source of vacuum. The sealing zones ma include temperature zones, cartridge heaters, cooling air, or hated air, or a source of ultrasonic, microwave or radiative energy.

An apparatus includes a cutting surface that contains at least one cutting element having a top. The cutting element also has an interior sidewall extending from the cutting surface to the top with an interior sidewall angle, an exterior sidewall extending from the cutting surface to the top with an exterior sidewall angle and a shoulder provided on the interior sidewall between the base and the top. The interior sidewall angle is different than the exterior sidewall angle.

An apparatus includes a cutting surface that contains at least one cutting element having a top. The cutting element also has an interior sidewall extending from the cutting surface to the top with an interior sidewall angle, an exterior sidewall extending from the cutting surface to the top with an exterior sidewall angle and a shoulder provided on the interior sidewall between the base and the top. The interior sidewall angle is different than the exterior sidewall angle.

A machine and method for making bags is described and includes a web traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a first sealing zone, and an adjacent weakening zone. The weakening zone may be a heated perforator, includes a heating wire, or be disposed to create an auxiliary sealed area. The heating wire can have connected thereto, a source of power that is an adjustable voltage or magnitude, and/or pulsed, and/or a feedback loop. The heating wire ay be an NiCr wire and make intermittent contact with the web and be disposed in an insert. The weakening zone may create a line of weakness that is uniform or varies in intensity, is a separating zone, or includes a heat film, a toothed blade, a row of pins, a source of air, or a source of vacuum. The sealing zones ma include temperature zones, cartridge heaters, cooling air, or hated air, or a source of ultrasonic, microwave or radiative energy.

A blade assembly is disclosed. The blade assembly includes a mounting ring, at least two elongate cutting blades, and a substantially circular central support positioned substantially at the center of the mounting ring. Each cutting blade may have a proximal end connected to the mounting ring. Each cutting blade may extend from the mounting ring toward a center of the mounting ring. Each cutting blade may be twisted along a length of the cutting blade. A distal end of each cutting blade may be connected to the central support.

The present invention provides an apparatus and method for cutting a chamfer into the edge of a material while simultaneously making another cut in the material. The chamfer provides the cut material with reduced susceptibility to top surface edge swell.

A blade assembly is disclosed. The blade assembly includes a mounting ring, at least two elongate cutting blades, and a substantially circular central support positioned substantially at the center of the mounting ring. Each cutting blade may have a proximal end connected to the mounting ring. Each cutting blade may extend from the mounting ring toward a center of the mounting ring. Each cutting blade may be twisted along a length of the cutting blade. A distal end of each cutting blade may be connected to the central support.

A blade assembly is disclosed. The blade assembly includes a mounting ring, at least two elongate cutting blades, and a substantially circular central support positioned substantially at the center of the mounting ring. Each cutting blade may have a proximal end connected to the mounting ring. Each cutting blade may extend from the mounting ring toward a center of the mounting ring. Each cutting blade may be twisted along a length of the cutting blade. A distal end of each cutting blade may be connected to the central support.

A machine and method for making bags is described and includes a web, traveling from an input section to a rotary drum, to an output section. The rotary drum includes at least one seal bar, having a first sealing zone, and an adjacent weakening zone. The weakening zone may be a heated perforator, includes a heating wire, or be disposed to create an auxiliary sealed area. The heating wire can have, connected thereto, a source of power that is at an adjustable voltage or magnitude, and/or pulsed, and/or a feedback loop. The heating wire may be an NiCr wire and make intermittent contact with the web and be disposed in an insert. The weakening zone may create a line of weakness that is uniform or varies in intensity, is a separating zone, or includes a heat film, a toothed blade, a row of pins, a source of air, or a source of vacuum. The sealing zones may include temperature zones, cartridge heaters, cooling air, or heated air, or a source of ultrasonic, microwave or radiative energy.

A blade assembly is disclosed. The blade assembly includes a mounting ring, at least two elongate cutting blades, and a substantially circular central support positioned substantially at the center of the mounting ring. Each cutting blade may have a proximal end connected to the mounting ring. Each cutting blade may extend from the mounting ring toward a center of the mounting ring. Each cutting blade may be twisted along a length of the cutting blade. A distal end of each cutting blade may be connected to the central support.