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Method for determination of roll density

  • US 6,917,895 B2
  • Filed: 05/30/2002
  • Issued: 07/12/2005
  • Est. Priority Date: 06/15/2001
  • Status: Expired due to Fees
First Claim
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1. In a method for determination of roll density, in which density of a wound roll formed of a web is determined at a multiplicity of occasions while reeling the web by measuring a parameter corresponding to at least one value selected from the group consisting of:

  • measured web length in the roll (l), measured roll diameter (D), and basis weight of the web (b); and

    using a known relation between variables;

    measured web length in the roll (l), measured roll diameter (D), initial roll diameter(Do), basis weight of web (b) and density (ρ

    ) of the wound roll;

    l=π

    ρ



    (D2-D02)
    4

    b
    the improvement comprising;

    eliminating distortions in said measured parameter caused by noise and other disturbances, by using a recursive time variant least squares method in the processing of said measured parameter.

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