Apparatus and method for closed-loop control of creped tissue paper structure
First Claim
1. A method comprising:
- using at least one processing device;
obtaining measurements associated with one or more controlled variables related to a structure of creped tissue paper during production of the creped tissue paper; and
generating at least one control signal that adjusts one or more manipulated variables associated with the production of the creped tissue paper in order to alter the structure of the creped tissue paper;
wherein the one or more controlled variables include a caliper of the creped tissue paper;
wherein the caliper of the creped tissue paper is calculated using a function;
C=C0+CCS where C represents the caliper of the creped tissue paper, C0 represents a base caliper for a given grade of tissue paper, and CCS represents a crepe structure-dependent component of the caliper C; and
wherein the crepe structure-dependent component CCS of the caliper is calculated based on a dominant frequency ω
of the creped tissue paper and a standard deviation σ
r of an intensity of diffusely-reflected light from the creped tissue paper.
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Abstract
A method includes obtaining measurements associated with one or more controlled variables related to a structure of creped tissue paper during production of the creped tissue paper. The method also includes generating at least one control signal that adjusts one or more manipulated variables associated with the production of the creped tissue paper in order to alter the structure of the creped tissue paper. The one or more controlled variables include a number of folds per unit length of the creped tissue paper, a caliper of the creped tissue paper, a macro crepe of the creped tissue paper, and/or a micro crepe of the creped tissue paper. The manipulated variable(s) could include a crepe percentage, a creping blade angle, a flow of sizing agent, and/or a cross direction (CD) profile of nozzle positions associated with a spray boom that sprays sizing agent onto a Yankee dryer.
23 Citations
21 Claims
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1. A method comprising:
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using at least one processing device; obtaining measurements associated with one or more controlled variables related to a structure of creped tissue paper during production of the creped tissue paper; and generating at least one control signal that adjusts one or more manipulated variables associated with the production of the creped tissue paper in order to alter the structure of the creped tissue paper; wherein the one or more controlled variables include a caliper of the creped tissue paper; wherein the caliper of the creped tissue paper is calculated using a function;
C=C0+CCSwhere C represents the caliper of the creped tissue paper, C0 represents a base caliper for a given grade of tissue paper, and CCS represents a crepe structure-dependent component of the caliper C; and wherein the crepe structure-dependent component CCS of the caliper is calculated based on a dominant frequency ω
of the creped tissue paper and a standard deviation σ
r of an intensity of diffusely-reflected light from the creped tissue paper.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 21)
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9. An apparatus comprising:
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at least one processing device configured to; obtain measurements associated with one or more controlled variables related to a structure of creped tissue paper; determine how to adjust one or more manipulated variables associated with production of the creped tissue paper in order to alter the structure of the creped tissue paper; and generate at least one control signal for adjusting the one or more manipulated variables; wherein the one or more controlled variables include a caliper of the creped tissue paper; wherein the caliper of the creped tissue paper is calculated using a function;
C=C0+CCSwhere C represents the caliper of the creped tissue paper, C0 represents a base caliper for a given grade of tissue paper, and CCS represents a crepe structure-dependent component of the caliper C; and wherein the crepe structure-dependent component CCS of the caliper is calculated based on a dominant frequency ω
of the creped tissue paper and a standard deviation σ
r of an intensity of diffusely-reflected light from the creped tissue paper.- View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory computer readable medium embodying a computer program, the computer program comprising computer readable program code for:
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obtaining measurements associated with one or more controlled variables related to a structure of creped tissue paper; and generating at least one control signal for adjusting one or more manipulated variables associated with production of the creped tissue paper in order to alter the structure of the creped tissue paper; wherein the one or more controlled variables include a caliper of the creped tissue paper; wherein the caliper of the creped tissue paper is calculated using a function;
C=C0+CCSwhere C represents the caliper of the creped tissue paper, C0 represents a base caliper for a given grade of tissue paper, and CCS represents a crepe structure-dependent component of the caliper C; and wherein the crepe structure-dependent component CCS of the caliper is calculated based on a dominant frequency ω
of the creped tissue paper and a standard deviation σ
r of an intensity of diffusely-reflected light from the creped tissue paper.- View Dependent Claims (18, 19, 20)
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Specification