US4903528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and process for detecting properties of travelling sheets in the cross direction
Assignee: Honeywell Measurex Corp
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Filing: 1988-09-26
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Granted: 1990-02-27
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Expires: 2008-09-26
Abstract
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.
Inventors
- 👤 Ramesh Balakrishnan
- 👤 Gurcan Aral
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:55
CPC Classifications
G; G01; G01N; G01N23/00; D; D21; D21G; D21G9/00; D21G9/0009
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
101 words
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.
Claim 2
Independent Claim
101 words
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.
Claim 3
Dependent Claim
31 words
The method of claim 1, wherein said estimating step includes estimating a measurement for a selected slice based upon actual measurements at the slice taken during two traverses of the slice.
Claim 4
Dependent Claim
19 words
The method of claim 2, wherein said measurements taken during consecutive traverses are linearly extrapolated to determine estimated measurements.
Claim 5
Dependent Claim
20 words
The method of claim 2, wherein said meaurements taken during consecutive traverses are linearly interpolated to determine the actual measurement.
Claim 6
Dependent Claim
47 words
The method of claim 1, wherein the estimating step includes: for each of the selected slices, determining a generally linear relationship between at least two measurements actually made on the slice; and estimating a measurement value based on said generally linear relationship for a selected reference location.
Claim 7
Dependent Claim
16 words
The method of claim 1, wherein the measured property is the basis weight of the sheet.
Claim 8
Dependent Claim
16 words
The method of claim 1, wherein the measured property is the moisture content of the sheet.
Claim 9
Dependent Claim
15 words
The method of claim 1, wherein the measured property is the caliper of the sheet.
Claim 10
Dependent Claim
11 words
The method of claim 1, wherein the sheet material is paper.
Claim 11
Dependent Claim
11 words
The method of claim 1, wherein the sheet material is plastic.
Claim 12
Independent Claim
102 words
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.
Claim 13
Independent Claim
102 words
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.
Claim 14
Dependent Claim
47 words
The method of claim 11, wherein the estimating step includes: for each of the selected slices, determining a generally linear relationship between at least two measurements actually made on the slice; and estimating a measurement value based on said generally linear relationship for a selected reference location.
Claim 15
Dependent Claim
16 words
The method of claim 11, wherein the measured property is the basis weight of the sheet.
Claim 16
Dependent Claim
16 words
The method of claim 11, wherein the measured property is the moisture content of the sheet.
Claim 17
Dependent Claim
15 words
The method of claim 11, wherein the measured property is the caliper of the sheet.
Claim 18
Dependent Claim
11 words
The method of claim 11, wherein the sheet material is paper.
Claim 19
Dependent Claim
11 words
The method of claim 11, wherein the sheet material is plastic.
Claim 20
Independent Claim
106 words
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.
Claim 21
Independent Claim
106 words
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.
Claim 22
Dependent Claim
21 words
The method of claim 18, wherein measurements taken during back and forth consecutive trverses are linearly extrapolated to determine estimated measurements.
Claim 23
Dependent Claim
22 words
The method of claim 18, also including the step of linearly interpolating measurements taken during consecutive traverses to determine the actual measurement.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |