Method to measure tension in a moving web and to control properties of the web
AssigneeKimberly-Clark Worldwide, Inc.
InventorsPaul D. Beuther, Amy Christina Seewoester, Robert Paul Guarnotta, Bryan Robert Moore, Philip Sim Lin, Kevin J. Mullally
Life of this patent
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Abstract
A process for determining the tension in a moving web is provided. The process includes the step of providing a web that is moving at a determined speed. The speed has a determined basis weight. A wave is created in the moving web. The speed of the propagation of the wave is determined. Also, the tension on the moving web is determined through a mathematical relationship between the wave speed, the basis weight of the web, and the speed of the web. The instability index of the web is greater than or equal to 0.5.
Claims24
A process for determining the tension in a moving web, comprising the steps of:
- providing a web moving at a determined speed, the web having a determined basis weight;
- creating a wave in the moving web;
- determining the speed of the propagation of the wave;
- and
- determining the tension on the moving web through a mathematical relationship between the wave speed, the basis weight of the web, and the speed of the web, wherein the instability index of the web is greater than or equal to 0.5.
A process for producing a paper web having substantially uniform properties, comprising the steps of:
- providing a moving paper web;
- determining the tension on the paper web while the web is moving;
- and
- adjusting a process condition of the web that affects modulus based on the determined tension to produce a web having more uniform properties, wherein the instability index of the web is greater than or equal to 0.5.
A process for controlling a moving web, comprising the steps of:
- providing a web moving at a determined speed, the web having a determined basis weight;
- generating a wave in the moving web;
- measuring the speed of the wave in the web;
- and
- determining the instability index where the instability index is in a desired range being between about 0.6 and 1.0.
A process for producing a paper web having substantially uniform properties, comprising the steps of:
- providing a moving paper web;
- determining the tension on the paper web while the web is moving, wherein the instability index of the web is greater than or equal to 0.5;
- adjusting cross directional dryer coating of the web based on the determined tension of the web;
- and
- adjusting creping chemistry based on the instability index.
A process for producing a paper web having at least two flows of different strengths, comprising:
- providing a moving layered paper web;
- providing at least one hardwood flow and at least one softwood flow to form at least one hardwood layer and at least one softwood layer of the paper web;
- determining the tension on the paper web while the web is moving;
- controlling the tension of the paper web by increasing the hardwood flow and decreasing the softwood flow in regions of high tension while maintaining a uniform basis weight, and by increasing the softwood flow and decreasing the hardwood flow in regions of low tension while maintaining a uniform basis weight, such that the tension is uniform.
Dependencies are inferred from the claim text.