Patent ID: 8613993
Filing Date: 2013-12-24
Classification: D04D,Y10T

Abstract:
1. A web material having a longitudinal direction and dimension, a width direction and dimension, a top surface, a bottom surface, and at least two edges that are boundaries of the width dimension, said web material comprising a plurality of rows of tilde-slits, wherein: a) the tilde-slits are cut extending from the top surface to the bottom surface; b) the tilde-slits are all congruent; c) each tilde-slit when unexpanded is a slit that consists essentially of: d) each row of tilde-slits comprising a plurality of tilde slits wherein their center points all lie along a straight centerline; e) the centerlines of the plurality of rows of tilde-slits being essentially parallel to each other; f) the end portions of the tilde-slits in a row being not parallel to the centerlines; g) the center point of any tilde-slit in a given row being positioned relative to the center point of the nearest tilde-slit in an adjacent row along a transversal intersecting the essentially parallel centerlines of the adjacent rows, wherein said transversal is not perpendicular to the essentially parallel centerlines; h) a second transversal extending coincident to said center point of the tilde-slit in an adjacent row and intersecting said transversal at an angle α to the longitudinal direction (x-axis), wherein the second transversal is not parallel to the longitudinal direction (x-axis) so that the tilde slit rows are offset; i) when said transversal is extended in any direction, and thus intersects the essentially parallel centerlines of the adjacent rows, the center point of a tilde-slit will coincide with the intersection of the transversal with every essentially parallel centerline; j) wherein each unexpanded tilde-slit further consists essentially of two curves that each connect an end portion to the center portion, wherein the two curves are double reversed mirror images of one another, such that the tilde-slit becomes a continuous figure formed by joining one end portion to one curve, and that one curve to the center portion, and the center portion to the second curve, and the second curve to the second end portion.