36 that is illustrated symbolically in the figures fig1 to 3 also illustrate the motor 60 that transfers a torsional moment on the extruder by means of a belt that is not illustrated a fan 61 and the machine frame 37 additional adhesive elements of other machine components such as rollers or guide rods are not illustrated since the bearing and mounting of such components are obvious to those of skill in this art similarly other machine components that are well known in principle such as the winding and unwinding stations are illustrated symbolically fig5 illustrates the cross section of a bag 25 manufactured by the device pursuant to the invention the figure illustrates the film webs a d the joint seams 27 joining them and also the side gussets 26 fig6 to 8 illustrate additional cross sections of a bag pursuant to the present invention the film tube 40 illustrated in fig6 like the film tube 25 comprises of four joined seams 27 that join the four film webs m n o and p to one another as opposed to the film tube 25 film tube 40 has no side gussets 26 in conclusion it must be stated emphatically that the illustrated film tubes pursuant to the present invention can also be processed further to manufacture end products other than ffs bags particularly the side gusseted film tube 25 can be used in various other applications to sum up the following points require to be mentioned the process according to the present invention can usually.