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A method and a device for producing and filling sacks with at least four longitudinal seams provide a more cost-effective approach to producing and filling sacks. The material that forms the sacks is supplied from an unwinding device in the form of a tubular material to a sack forming device. The tu

A method and a device for producing and filling sacks with at least four longitudinal seams provide a more cost-effective approach to producing and filling sacks. The material that forms the sacks is supplied from an unwinding device in the form of a tubular material to a sack forming device. The tubular material is provided with longitudinal seams in the sack forming device, with the seams extending over a major part of the sacks.

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What is claimed is: 1. A method for producing and filling sacks comprising: supplying a material that forms the sacks in a form of a tubular material from an unwinding device to a sack-forming device, the tubular material being supplied in a cyclically intermittent transport mode; providing the tub

What is claimed is: 1. A method for producing and filling sacks comprising: supplying a material that forms the sacks in a form of a tubular material from an unwinding device to a sack-forming device, the tubular material being supplied in a cyclically intermittent transport mode; providing the tubular material in the sack-forming device with at least four longitudinal seams while the tubular material is in a laid-flat state, the longitudinal seams extending at least over a major part of a sack length, the step of providing the longitudinal seams including applying a weld during a stopped phase of the intermittent transport; cooling the longitudinal seams of the tubular material in a cooling device; separating the cooled, seamed tubular material into individual tube pieces; and transporting the tube pieces by grippers during at least one part of a path in the sack-forming device. 2. The method according to claim 1, wherein the sack-forming device forms the sacks by forming sack bottoms in the tubular material by cross-welds. 3. The method according to claim 1, wherein the sack-forming device fills the sacks with filling material. 4. The method according to the claim 1, wherein the grippers engage around the tube pieces in an outer edge region thereof with the tube piece hanging down. 5. The method according to claim 1, wherein the tube pieces are transported horizontally for at least one half of the path. 6. The method according to claim 1, further comprising, before the step of supplying the tubular material from the unwinding device, a step of joining edge regions of a flat film to each other with a longitudinal joining seam so as to provide the tubular material. 7. The method according to claim 1, wherein the tubular material is a side-gusseted tube and the longitudinal seams are applied on outer folds of the side-gusseted tube. 8. The method according to claim 1, wherein the tubular material is provided with diagonal welds. 9. A device for manufacturing and filling sacks comprising: an unwinding device from which a material that forms the sacks is supplied as a tubular material to a sack-forming device, the tubular material being supplied in a cyclically intermittent transport mode; a longitudinal weld device that provides the tubular material in the sack-forming device with at least four longitudinal seams which extend over at least a major part of a sack length while the tubular material is in a laid-flat state, the longitudinal weld device being configured to apply a weld during a stopped phase of the intermittent transport; a cooling device that cools the longitudinal seams of the tubular material; a cross-cutting station in which the tubular material is separated into tube pieces; and holding means for transporting the tube pieces during at least one part of their path in the sack-forming device. 10. The device according to the claim 9, further comprising a dancer device provided between the unwinding device and the longitudinal weld device. 11. The device according to claim 9, wherein the cooling device has a length of at least 30 cm in a transport direction of the tubular material. 12. The device according to claim 9, wherein the cooling device has a length of at least 45 cm in a transport direction of the tubular material. 13. A method of producing and filling a sack comprising: supplying a tubular material laid in a flat state from an unwinding device to a sack-forming device, the tubular material including a first and a second gusset at opposed sides of the tubular material, and the tubular material being supplied in a cyclically intermittent transport mode; providing the unwound flat tubular material in the sack-forming device with at least four longitudinal seams which extend over at least a major part of a sack length, each of the seams being located along a sack edge, the step of providing the longitudinal seams including applying a weld during a stopped phase of the intermittent transport; cooling the longitudinal seams of the tubular material in a cooling device; separating the cooled, seamed tubular material into individual tube pieces; and transporting the tube piece by grippers. 14. The method according to claim 13, wherein the longitudinal seam is a welded seam that stabilizes the sack.