Abstract: A tube includes a structural ply wrapped around an axis of the tube, and adhesive which adheres an outer surface of the structural ply to an inner surface. The inner surface is part of the structural ply, or it is part of a second ply of the tube. The outer surface confronts the inner surface, and the adhesive is arranged in a predetermined pattern so that only a predetermined percentage of the outer surface is substantially adhered to the inner surface (e.g., the tube is only “partially adhered”). The predetermined pattern can include three or more stripes of the adhesive, and the predetermined percentage can be substantially less than 100%. The predetermined pattern is preferably provided by apparatus for applying and/or arranging the adhesive on the ply in a predetermined pattern prior to the ply being formed into the tube.

Abstract: The invention provides a method and apparatus for spirally winding a tube of enhanced spiral seam uniformity that is simple and reliable. The spirally wound tube is formed using a spiral pitch control surface that engages with an exterior or interior cylindrical surface of a spirally wound tube and constrains movement of the tube to a predetermined spiral rotation as it is formed on a cylindrical stationary mandrel. Preferably, the pitch control surface comprises a tube engaging surface positioned along at least one spirally aligned portion of the exterior portion of the tube forming mandrel.

Abstract: The invention provides a method and apparatus for spirally winding a tube of enhanced spiral seam uniformity that is simple and reliable. The spirally wound tube is formed using a spiral pitch control surface that engages with an exterior or interior cylindrical surface of a spirally wound tube and constrains movement of the tube to a predetermined spiral rotation as it is formed on a cylindrical stationary mandrel. Preferably, the pitch control surface comprises a tube engaging surface positioned along at least one spirally aligned portion of the exterior portion of the tube forming mandrel.

Abstract: Apparatus and method of truncating a tube by having a knife act against a counter-knife which is positioned within the interior of the tube. The counter-knife is maintained in a desired position with respect to the knife by a magnetic apparatus.

Abstract: An apparatus for cutting a continuously manufactured tube including a knife-holder carriage which is movably mounted for translation and which is provided with a knife activator, a return mechanism for returning the carriage to an initial position following each cutting of a tube section, a driving mechanism for moving the carriage which includes a first driving motor and a first clutch system and a device for determining a section length of tube to be obtained operably connected to control the function of the first clutch system after each cutting based on the desired length of tube to be cut.

Abstract: An apparatus and method of truncating a tube by having a knife act against a counter-knife which is positioned within the interior of the tube. The counter-knife is maintained in a desired position with respect to the knife by a magnetic apparatus.

Abstract: The invention relates to a process and apparatus for truncating tubes by means of a knife activated by a jack. The knife is mounted on a knife carrier pivotable on a base by one of the ends of a jack the other end of which is journalled on a lever similarly pivotable on the base and which rests in part on an elastic abutment adapted to pivot the lever towards the tube to be cut after having been compressed by the lever during a pivoting of the lever in a direction opposite to the tube and after an interruption of the extension of the jack, with a stop being provided to limit the extent of pivoting of the lever in the direction opposite of the tube to be cut.

Abstract: The invention relates to a truncation apparatus and a process of truncating tubes. The truncation apparatus includes a mandrel, a means for advancing the tube to be truncated along the mandrel, at least one knife positioned in proximity to the free end of the mandrel, a slide moveably mounted on the mandrel and an exterior abutment whose distance with respect to the knife is adjustable, in addition to at least one reference system which is longitudinally adjustable adjacent the mandrel and defines predetermined and adjustable lengths between the front end of slide and the knife, and is provided with means to stop the longitudinal displacement of the slide in a manner so as to define a selected length for the last truncated portion of the tube. A method for truncating tubes wherein a length of tube is positioned on a mandrel and cut into at least a first section including one of the end edges of the tube and a last section including the other end edge of the tube.

Abstract: The invention relates to a protective device formed by a hollow body with a first end, a second end and a surface wherein at least a section of a surface is provided with a series of corrugations extending longitudinally from the first end and essentially to the second end, wherein a portion of the hollow body has a cylindrical shape and a portion has a frustoconical shape and wherein the corrugations converge towards a point on the longitudinal axis of the hollow body with their depth increasing in the direction of their convergence so that the average diameter of the body decreased in a substantially progressive manner along the longitudinal axis beginning adjacent the first end of the body, preferably wherein an annular element having an exterior diameter corresponding essentially to the exterior diameter of the first end is attached thereto and wherein the second end of the hollow body is opened with its surface folding in towards the interior of the hollow body as a lip and wherein the hollow body is pro

Abstract: Process for manufacturing a calibrated cardboard tube having minimal surface roughness and dimensional stability, involving helically winding a plurality of glued strips or plies around a mandrel and then polishing the exterior surface of the rough tube, coating the exterior surface with a thermosetting resin, cutting the tube, drying and compressing the cut pieces transversely together with applying heat, wherein at least the next-to-last ply and the last ply or strips of a dense material are impregnated with a thermosetting resin and, after coating and heat compression of the pieces, a final coating of a thermosetting resin is applied to the last plies before drying the coated surface and buffing or finish polishing to form a smooth surface, and the apparatus for performing the process.

Abstract: Apparatus for truncating a continuously formed cellulosic tube, which is rotated and translated as it is being formed and has a free end that moves in an axial direction as the tube is formed, includes a carriage mounted for translation in said axial direction between forward and rearward positions. The apparatus includes a translatable abutment that engages the free end of the tube for movement therewith in response to engagement. The carriage is coupled to to the abutment for translating the carriage from its rearward position in response to forward movement of the tube. A cutter is mounted on the carriage for transverse movement relative to the axis of the tube; and a cam follower engaged with a cam surface is operatively connected to the cutter. The cam follower/cam surface are constructed and arranged so that, in response to forward translation of the carriage, the cutter moves transversely into cutting engagement with the tube.