Method of perforating a nonlinear line of weakness
AssigneeThe Procter & Gamble Company
InventorsKathryn Christian Kien, Deborah Sue Slovut, Jeffrey Moss Vaughn
Life of this patent
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Abstract
A method for perforating a web with a perforating apparatus includes: rotating a cylinder about a longitudinal cylinder axis, wherein the cylinder comprises at least one shaped blade; operatively engaging a movable support with the cylinder; positioning an anvil disposed on the support so as to cooperate in contacting relationship with the shaped blade, wherein at least one of the blade and the anvil comprise a plurality of teeth, and wherein adjacent teeth are separated by a recessed portion; feeding a web between the cylinder and the support; and perforating the web as the anvil cooperates in contacting relationship with the shaped blade disposed on the rotating cylinder.
Claims23
A method for perforating a web, the method comprising:
- rotating a cylinder comprising a longitudinal cylinder axis and at least one shaped blade;
- operatively engaging a moveable support with the cylinder;
- positioning a blade on the support so as to cooperate in contacting relationship with the shaped blade, wherein the shaped blade and the blade disposed on the support each comprise a plurality of teeth, and wherein adjacent teeth are separated by a recessed portion, wherein at least one of the plurality of teeth on at least one of the shaped blade and the blade disposed on the support has a tooth length, and wherein at least one of the plurality of teeth on the at least one of the shaped blade and the blade disposed on the support has a recessed portion length, and wherein each tooth length and each recessed portion length of the at least one of the plurality of teeth on at least one of the shaped blade and the blade disposed on the support are non-uniform;
- feeding a web between the cylinder and the support;
- and
- perforating the web as the blade disposed on the support cooperates in contacting relationship with the shaped blade disposed on the rotating cylinder, wherein the web comprises perforated portions and non-perforated portions, and wherein the perforated portions and the non-perforated portions are uniform.
A method for perforating a web with a perforating apparatus, the method comprising:
- rotating a cylinder about a longitudinal cylinder axis, wherein the cylinder comprises at least one anvil;
- operatively engaging a moveable support with the cylinder;
- positioning a blade disposed on the support so as to cooperate in contacting relationship with the anvil, wherein the blade defines a linear shape and the anvil defines a non-linear shape, wherein the blade comprises a plurality of teeth, wherein adjacent teeth are separated by a recessed portion, wherein each of the plurality of teeth has a tooth length and each recessed portion has a recessed portion length, and wherein each tooth length and each recessed portion length are non-uniform;
- feeding a web between the cylinder and the support;
- and
- perforating the web as the anvil cooperates in contacting relationship with the shaped blade disposed on the rotating cylinder, wherein the web comprises perforated portions and non-perforated portions, and wherein the perforated portions and the non-perforated portions are uniform.
A method for making non-linear perforations, the method comprising:
- rotating a cylinder about a longitudinal cylinder axis, wherein the cylinder comprises at least one shaped anvil, wherein the anvil is shaped in a non-linear path of a desired perforation on a web;
- operatively engaging a moveable support with the cylinder;
- positioning a linear blade disposed on the moveable support, the linear blade having a plurality of teeth such that the teeth cooperate in contacting relationship with the shaped anvil, each tooth having a tooth length, and each tooth being separated from an adjacent tooth by a recessed portion defining a recessed portion length, wherein each tooth length and each recessed portion length are uniform;
- wherein each tooth length is individually predetermined such that its projected contacting relationship onto the anvil delimits a length of the anvil equal to a desired length of a perforation in the web, and each recessed portion length is individually predetermined such that its projected relationship with respect to the anvil delimits a length of the shaped anvil equal to a desired length of a non-perforated portion of the web;
- feeding the web between the cylinder and the support as the teeth of the linear blade cooperate in contacting relationship with the shaped anvil;
- and
- perforating the web with one or more perforation lengths and one or more non-perforation lengths in the non-linear path, wherein the web comprises a plurality of perforated portions and a plurality of non-perforated portions, and wherein the plurality of perforated portions and the plurality of non-perforated portions are non-uniform.
Dependencies are inferred from the claim text.