Abstract: A method and system of determining fiber diameter distribution of a fibrous media is disclosed. The method includes providing at least one digital image representative of the fibrous media, pre-processing the images, binarizing the images, generating virtual lines on the image, solving for fiber fringe points on each of generated line, solving for fiber center points as a mean of the fringe points, generating and growing measurement circles about the fiber center points, repositioning circles and center points to avoid fiber intersections, resizing the repositioned measurement circles to intersect the opposing fringes, and calculating fiber diameters and fiber spacing.

Abstract: A method and apparatus for creating a hinge on a corner edge of a rectangular tube as well as a tube so produced is provided in which a roller having a line defining a diameter of the roller at approximately 45° from a line defining a planar surface of the rectangular tube, a pivot axis of the roller being oriented to permit the roller to roll longitudinally down a length of the tube. The roller comprises a v-shaped indent disposed radially around its outer periphery and a groove located at an apex of the v-shaped indent. Pressure is applied by the roller against the tube in a radial direction of the roller, thereby contacting a corner edge of the tube with the groove to stress tube material at the corner edge. A relative movement is induced between the roller and the tube in a longitudinal direction of the tube, thereby creating a hinged corner edge of the tube.