Abstract: A method of positioning and sealing a bag in a vacuum chamber, includes detecting a trailing edge of a product in the bag, detecting a trailing edge of a patch adhered to the bag, controlling advancement of the bag, and closing the bag. A bag positioning apparatus includes an infrared sensing apparatus, a fluorescence sensing apparatus, and a controller. A method of manufacturing a patch bag includes adhering a first patch to film stock, detecting a position of the first patch, aligning a second patch with the first patch, and adhering the second patch to the film stock. A method of manufacturing a patch bag includes detecting an edge of a patch adhered to film stock, forming a seal across the film stock adjacent to the edge of the patch, and severing the film stock adjacent to the edge of the patch.

Abstract: A method of positioning and sealing a bag in a vacuum chamber, includes detecting a trailing edge of a product in the bag, detecting a trailing edge of a patch adhered to the bag, controlling advancement of the bag, and closing the bag. A bag positioning apparatus includes an infrared sensing apparatus, a fluorescence sensing apparatus, and a controller. A method of manufacturing a patch bag includes adhering a first patch to film stock, detecting a position of the first patch, aligning a second patch with the first patch, and adhering the second patch to the film stock. A method of manufacturing a patch bag includes detecting an edge of a patch adhered to film stock, forming a seal across the film stock adjacent to the edge of the patch, and severing the film stock adjacent to the edge of the patch.

Abstract: An apparatus for dispensing a web from a plurality of rolls of serrated bags, includes first and second web printer/web feeders, each adapted to advance and print first and second webs from a first and second roll of serrated bags respectively, the first and second web printer/web feeders including a first and second printer, and a first and second set of nip rollers respectively; first and second accumulator guide plates located downstream of the first and second printers; a set of dispensing nip rollers located downstream of the first and second accumulator guide plates; a web accumulation area; a web sensor for sensing an end of the first or second web; a first and second seal sensing device; a dispensing guide plate located downstream of the web sensor; and a bag handling mechanism for advancing a leading bag to a bag loader.

Abstract: An apparatus for dispensing a web from a plurality of rolls of serrated bags, includes first and second web printer/web feeders, each adapted to advance and print first and second webs from a first and second roll of serrated bags respectively, the first and second web printer/web feeders including a first and second printer, and a first and second set of nip rollers respectively; first and second accumulator guide plates located downstream of the first and second printers; a set of dispensing nip rollers located downstream of the first and second accumulator guide plates; a web accumulation area; a web sensor for sensing an end of the first or second web; a first and second seal sensing device; a dispensing guide plate located downstream of the web sensor; and a bag handling mechanism for advancing a leading bag to a bag loader.

Abstract: In the packaging of a wide variety of products in flexible film bags, problems with edge tear and incomplete bag cut-off have been encountered. The edge tear and incomplete cut-off are worse for films containing low melting polymers, such as metallocene-catalyzed ethylene/alpha-olefin copolymers. These problems can be solved using a clamp-cut-seal process, as opposed to a clamp-seal-cut process. By cutting before sealing, the film is still cool, and the strain on the film due to the cutting does not pull on the seal area enough to cause edge tearing (i.e., tearing at the seal). The higher resistance to elongation of the cool, clamped film also serves to reduce or prevent incomplete bag tail cutoff. Also, by providing a means for sealing which clamps the film before it is cut, defective seals from bag “pull back” can be avoided.