B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
B30B1/185—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means driven through friction roller means
Procede de reglage de l'avancement pas-a-pas et dispositif d'avancement pas-a-pas de plusieurs gaines thermoplastiques aplaties dans une installation de fabrication de sacs