System and process for detecting properties of travelling sheets in the cross direction
AssigneeMeasurex Corporation
InventorsRamesh Balakrishnan, Gurcan Aral
Life of this patent
Estimating the term…
Abstract
To determine measurements such as basis weight and caliper of a travelling sheet during production, the sheet is repeatedly traversed with a scanning sensor and, during each traverse, measurements are taken at a plurality of slice locations. Then, a series of reference locations are selected which are spaced apart in the machine direction along the sheet surface. Then, for selected slices, measurement values are estimated based upon actual measurements taken at locations on the selected slices which are not spaced in the machine direction at the same spacing as reference locations.
Claims20
A method for determining measurements of a property of travelling sheet materials during production, wherein the reference locations are generally regularly spaced apart, comprising the steps of:
- repeatedly traversing a travelling sheet with a scanning sensor and, during each traverse, taking measurements of a property of the sheet at a plurality of slice locations;
- selecting a series of reference locations which are spaced apart in the machine direction along the sheet surface;
- then, for selected slices, estimating measurement values at locations on the selected slices which are not spaced in the machine direction at the same spacing as the reference locations.
A method of determining measurements of a property of continuous sheet material during production, wherein the reference locations are generally regularly spaced apart, comprising the steps of:
- repeatedly traversing a travelling sheet from edge to edge with a scanning sensor;
- during each traverse, taking measurements of a property of the sheet at selected slice locations;
- for each traverse, selecting a reference machine-direction location which is generally regularly spaced relative to precedingly-selected machine-directional locations;
- estimating measured values of the sheet property at the selected slices based upon measurements actually taken at the slices at locations which are generally regularly spaced in the machine-direction.
A method for determining measurements of a property of a travelling sheet during production, wherein the reference locations are generally regularly spaced apart, comprising the steps of:
- repeatedly traversing a travelling sheet with a scanning sensor and, during each traverse, taking measurements of a property of a sheet at a plurality of slice locations;
- selecting a series of reference locations which are spaced apart in the machine direction along the sheet surface;
- for each of the selected slices, determining generally linear relationships between at least two measurements actually made on the slice;
- and
- estimating measurement values based on said generally linear relationship for selected reference locations.
Dependencies are inferred from the claim text.