Perforating apparatus and method for manufacturing a shaped line of weakness

Patent metadata

Field	Value
Publication number	US-12157243-B2
Application number	US-202318473647-A
Country	US
Kind code	B2
Filing date	Sep 25, 2023
Priority date	Sep 11, 2017
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

A perforating apparatus and method includes a longitudinal cylinder axis about which a cylinder rotates. At least one shaped anvil bead is disposed on the cylinder. The cylinder including an anvil block and an anvil bead form a cavity. The cavity may be used to control the debris produced during the perforating process. A blade is disposed on a support to cooperate in contacting relationship with the anvil bead. A web is perforated as the web passes between the rotating cylinder and the support and the blade operatively engages with the anvil bead. The debris may be controlled by being drawn into the cavity prior to the point where the blade engages the anvil and, subsequently, being expelled after the point where the blade engages the anvil bead.

First claim

What is claimed is:

1. A method of perforating a web, the method comprising:
rotating a cylinder about a longitudinal cylinder axis, the cylinder comprising an outer circumferential surface, wherein the outer circumferential surface defines a plurality of recessed portions, wherein a plurality of anvil blocks are positioned within the plurality of recessed portions, wherein the plurality of anvil blocks are radially disposed about the outer circumferential surface and define cavities therebetween, and wherein each of the plurality of anvil blocks comprise an anvil bead;
operatively engaging a blade with the anvil beads, wherein the blade is substantially parallel to the longitudinal cylinder axis, and wherein at least one of the blade and the anvil comprise a plurality of teeth;
feeding a web between the cylinder and the blade while the blade cooperates in contacting relationship with the anvil bead;
perforating the web to form a shaped line of weakness;
generating debris from perforating the web;
controlling the debris such that the debris is drawn into the cavities between the anvil blocks and away from the web;
expelling the debris from the cavities of the rotating cylinder,
wherein the cylinder comprises a cylinder diameter,
wherein the anvil block comprises an anvil block surface, the anvil block surface having an anvil block diameter,
wherein the anvil bead comprises an anvil bead tip, the anvil bead tip having an anvil bead diameter,
wherein the difference of the cylinder diameter and a diameter of an outer boundary circumferential surfaces of the anvil blocks is from 0.6 inches to 0.8 inches, and
wherein the difference of a diameter of an outer boundary circumferential anvil beads and the diameter of the outer boundary circumferential surfaces of the anvil blocks is from 0.2 inches to 0.4 inches,
wherein the difference of the anvil bead diameter and the anvil block diameter is from 0.2 inches to 0.4 inches.

2. The method of claim 1 , wherein the anvil blocks are helically mounted on the rotating cylinder at an angle of 1 degrees to 10 degrees to the longitudinal cylinder axis.

3. The method of claim 1 , wherein the anvil blocks are removably attached to an outer surface of the cylinder.

4. The method of claim 1 , wherein the anvil block comprises one or more anvil segments.

5. The method of claim 1 , wherein the web is at least one of bath tissue and towel tissue.

6. The method of claim 1 , wherein the web comprises a longitudinal web axis, wherein the longitudinal web axis is tangential to the outer circumferential surface of the cylinder.

7. A method of perforating a web, the method comprising:
rotating a cylinder about a longitudinal cylinder axis, the cylinder comprising an outer circumferential surface, wherein the outer circumferential surface defines a plurality of recessed portions, wherein a plurality of anvil blocks are positioned within the plurality of recessed portions, wherein the plurality of anvil blocks are radially disposed about the outer circumferential surface and define cavities therebetween, and wherein each of the plurality of anvil blocks comprise an anvil bead;
operatively engaging a blade with the anvil beads, wherein the blade is substantially parallel to the longitudinal cylinder axis, and wherein at least one of the blade and the anvil comprise a plurality of teeth;
feeding a web between the cylinder and the blade while the blade cooperates in contacting relationship with the anvil bead;
perforating the web to form a shaped line of weakness;
generating debris from perforating the web;
controlling the debris such that the debris is drawn into the cavities between the anvil blocks and away from the web;
expelling the debris from the cavities of the rotating cylinder,
wherein the cylinder comprises a cylinder diameter,
wherein the anvil block comprises an anvil block surface, the anvil block surface having an anvil block diameter,
wherein the anvil bead comprises an anvil bead tip, the anvil bead tip having an anvil bead diameter,
wherein the difference of the cylinder diameter and a diameter of an outer boundary circumferential anvil beads is from 0.6 inches to 1.2 inches, and
wherein the difference of the diameter of the outer boundary circumferential anvil beads and a diameter of an outer boundary circumferential surfaces of the anvil blocks is from 0.2 inches to 0.4 inches.

8. The method of claim 7 , wherein the anvil blocks are helically mounted on the rotating cylinder at an angle of 1 degrees to 10 degrees to the longitudinal cylinder axis.

9. The method of claim 7 , wherein the anvil blocks are removably attached to an outer surface of the cylinder.

10. The method of claim 7 , wherein the anvil block comprises one or more anvil segments.

11. The method of claim 7 , wherein the web is at least one of bath tissue and towel tissue.

12. The method of claim 7 , wherein the web comprises a longitudinal web axis, wherein the longitudinal web axis is tangential to the outer circumferential surface of the cylinder.

Assignees

• Procter & Gamble

Inventors

• Glass Katie Kristine
• Freije Zachary Aaron
• Brightman Matthew Travis
• Tenhundfeld Nicholas Raymond

Classifications

• B26D7/1863

  by suction · CPC title

• B26D1/385

  for thin material, e.g. for sheets, strips or the like · CPC title

• B26D7/1854

  by air under pressure · CPC title

• B26D1/626

  for thin material, e.g. for sheets, strips or the like · CPC title

• B26F1/10 Primary

  Roller type punches · CPC title