Abstract: In an apparatus and a method of producing a roll of bags, a bag feeding device is arranged to feed bags one by one to a winding device. The winding device includes a rotating spindle which is arranged to engage with each bag separately to wind the bag on it, so as to build a roll of bags in which the bags are unconnected to one another yet firmly held together. The winding device comprises at least two separate winding stations, each winding station being connected to one or more bag feeding devices; and a switch that is arranged upstream of a bag feeding device to direct the bags from one winding station to the other when a roll of bags has been completed in one of the winding stations.

Abstract: In a method for working an elongate web of material, use is made of a machine which comprises a feeding device for feeding the web at a given speed and a cutting device for making cuts in the web. The cutting device comprises a rotary backing roll and a rotary cutting roll with a projecting cutting means. The cutting roll is adapted to move, during a first part of its revolution, the cutting means into engagement with the backing roll to form the cuts in the web and, during a second part of its revolution, define with the backing roll a gap through which the web moves essentially unimpededly. A control means is adapted to control, preferably in an infinitely variable manner, the speed of rotation of the cutting roll relative to the speed of the web during the second part of the revolution for optional adjustment of the distance between succeeding cuts in the web.

Abstract: In an apparatus and a method of producing a roll of bags, a bag feeding device is arranged to feed bags one by one to a winding device. The winding device includes a rotating spindle which is arranged to engage with each bag separately to wind the bag on it, so as to build a roll of bags in which the bags are unconnected to one another yet firmly held together. The winding device comprises at least two separate winding stations, each winding station being connected to one or more bag feeding devices; and a switch that is arranged upstream of a bag feeding device to direct the bags from one winding station to the other when a roll of bags has been completed in one of the winding stations.

Abstract: In a method for working an elongate web of material, use is made of a machine which comprises a feeding device for feeding the web at a given speed and a cutting device for making cuts in the web. The cutting device comprises a rotary backing roll and a rotary cutting roll with a projecting cutting means. The cutting roll is adapted to move, during a first part of its revolution, the cutting means into engagement with the backing roll to form the cuts in the web and, during a second part of its revolution, define with the backing roll a gap through which the web moves essentially unimpededly. A control means is adapted to control, preferably in an infinitely variable manner, the speed of rotation of the cutting roll relative to the speed of the web during the second part of the revolution for optional adjustment of the distance between succeeding cuts in the web.

Abstract: A welding unit for forming defining weld lines in an elongate web, preferably in a bag-making machine, includes a drive means, which is arranged in an endless loop, and at least one sealing jaw. The sealing jaw is connected to the drive means for movement along said loop. A fixed guide means extends in an endless loop essentially in parallel with the drive means. Each sealing jaw is received on a carriage, which is connected to the drive means and has at least one follower element, which is adapted to abut against and move along the guide means.