Abstract: The present invention relates to a machine for erecting cardboard or the like into packaging articles having single or multiple ribs derived from glued folds.

Abstract: A machine for the manufacture of tubes of cardboard or like sheet material that have a length substantially greater than their width, comprises a core about which the sheet is bent to the desired shape of the tube. Sheets are advanced one by one into registry with the core, and then are bent in concave molds that are hinged together and that swing one by one to bend first one half and then the other of the sheet about the core, after which the seam is sealed. An extractor for the tube is provided, in the form of rods that are slidably located in complementary grooves in the core and that have protruding wings which, when moving from retracted to extended position, contact diametrically opposite edge portions of the formed tube to strip the tube from the core.