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US 6,838,040 B2Granted
Method for weakening a portion of a web
AssigneeKimberly-Clark Worldwide, Inc.
InventorsJoseph A. Mlinar, Todd W. Hajos, Kenneth J. Wagner
Life of this patent
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Abstract
A method for weakening a portion of a web includes moving a web in a machine direction between at least a first location and a second location, wherein the second location is positioned downstream of the first location, forming a line of weakness in the web at the first location, wherein the web has a first tensile strength across the line of weakness, and weakening the line of weakness at a second location, wherein the web has a second tensile strength across the line of weakness after the line of weakness is weakened at the second location and wherein the first tensile strength is greater than the second tensile strength.
Claims22
A method for weakening a portion of a web comprising:
- moving said web in a machine direction between at least a first location and a second location, wherein said second location is positioned downstream of said first location;
- forming a line of weakness in said web at said first location, wherein said web has a first tensile strength across said line of weakness;
- and
- weakening said line of weakness at a second location, wherein said web has a second tensile strength across said line of weakness aller said line of weakness is weakened at said second location, wherein said first tensile strength is greater than said second tensile strength, wherein said weakening said line of weakness at said second location comprises separating portions of said web along said line of weakness at said second location.
1 more element
A method for weakening a portion of a web comprising:
- moving said web in a machine direction between at least a first location and a second location, wherein said second location is positioned downstream of said first location;
- perforating said web along a cross-direction at said first location and thereby forming a cross-direction perforation in said web;
- and
- moving said web between first and second moveable members at said second location, wherein said first moveable member comprises at least one insert member and wherein said second moveable member comprises at least one recess shaped to receive said insert member;
- and
- pushing at least a portion of said web at said cross-direction perforation with said insert member into said recess.
3 more elements
A method for weakening a portion of a web comprising:
- moving said web in a machine direction between at least a first location and a second location, wherein said second location is positioned downstream of said first location;
- perforating said web along a cross-direction at said first location and thereby forming a cross-direction perforation in said web;
- and
- moving said web between first and second moveable members, wherein said first moveable member comprises at least one insert member and wherein said second moveable member comprises at least one recess shaped to receive said insert member;
- pushing at least a portion of said web at said cross-direction perforation with said insert member into said recess;
- and
- directing an air supply through said insert member.
4 more elements
A method for weakening a portion of a web comprising:
- moving said web in a machine direction between at least a first location and a second location, wherein said second location is positioned downstream of said first location;
- forming a line of weakness in said web at said first location, wherein said web has a first tensile strength across said line of weakness;
- and
- weakening said line of weakness at a second location, wherein said web has a second tensile strength across said line of weakness after said line of weakness is weakened at said second location, wherein said first tensile strength is greater than said second tensile strength, wherein said weakening said line of weakness at said second location comprises moving said web between a first moveable member and a second member, wherein said first moveable member comprises at least one insert member and wherein said second member comprises at least one recess shaped to receive said insert member, and further comprising pushing at least a portion of said web at said line of weakness with said insert member into said recess.
1 more element
A method for weakening a portion of a web comprising:
- moving said web in a machine direction between at least a first location and a second location, wherein said second location is positioned downstream of said first location;
- forming a line of weakness in said web at said first location, wherein said web has a first tensile strength across said line of weakness;
- weakening said line of weakness at a second location, wherein said web has a second tensile strength across said line of weakness after said line of weakness is weakened at said second location, wherein said first tensile strength is treater than said second tensile strength, wherein said weakening said line of weakness at said second location comprises moving said web between first and second moveable members, wherein said first moveable member comprises at least one insert member and wherein said second moveable member comprises at least one recess shaped to receive said insert member, and further comprising pushing at least a portion of said web at said line of weakness with said insert member into said recess;
- and
- directing an air supply through said insert member.
2 more elements
Dependencies are inferred from the claim text.