Method for determination of roll density
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;
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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Abstract
A method for determining roll density in connection with a web reel. A known relation between the length (l), diameter (D), basis weight (b) and density (ρ) of the wound roll, formula (1) is used. Distortions caused in the measurement results by noise and other disturbances are eliminated by using a recursive time variant least squares method in the processing of the measurement results l=πρ(D2−D20)/4b.
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Citations
11 Claims
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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;
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- measured web length in the roll (l), measured roll diameter (D), and basis weight of the web (b); and
Specification