CA2320941A1 - Method and device for measuring the amount of coating on a moving substrate - Google Patents
Method and device for measuring the amount of coating on a moving substrate Download PDFInfo
- Publication number
- CA2320941A1 CA2320941A1 CA002320941A CA2320941A CA2320941A1 CA 2320941 A1 CA2320941 A1 CA 2320941A1 CA 002320941 A CA002320941 A CA 002320941A CA 2320941 A CA2320941 A CA 2320941A CA 2320941 A1 CA2320941 A1 CA 2320941A1
- Authority
- CA
- Canada
- Prior art keywords
- measuring
- amount
- coating
- micrometers
- wavelength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 36
- 239000011248 coating agent Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000758 substrate Substances 0.000 title claims abstract description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 58
- 238000005259 measurement Methods 0.000 claims abstract description 31
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 29
- 238000010521 absorption reaction Methods 0.000 claims abstract description 24
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 23
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 23
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000005855 radiation Effects 0.000 claims description 8
- 239000011111 cardboard Substances 0.000 claims description 7
- 239000011087 paperboard Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000123 paper Substances 0.000 description 23
- 229960003563 calcium carbonate Drugs 0.000 description 22
- 235000010216 calcium carbonate Nutrition 0.000 description 22
- 229960000829 kaolin Drugs 0.000 description 16
- 238000001228 spectrum Methods 0.000 description 8
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000013074 reference sample Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 229960005196 titanium dioxide Drugs 0.000 description 1
- 235000010215 titanium dioxide Nutrition 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Paper (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a method and a device for measuring the amount of coating on a moving substrate. Reflection measurement is used in the invention for measuring the properties of a coating (4a). The amount of calcium carbonate in the coating is measured by measuring an absorption peak of calcium carbonate at a wavelength of about 3.95 micrometers and/or the amount of kaolin is measured by measuring an absorption peak of kaolin at a wavelength of about 2.7 micrometers.
Description
METHOD AND DEVICE FOR MEASURING THE AMOUNT OF COATING ON A
MOVING SUBSTRATE
The invention relates to a method for measuring the amount of coating on a moving substrate, the method comprising measuring the amount of at least one component in a coating by reflection measurement.
The invention also relates to a device for measuring the amount of coating on a moving substrate, the device comprising a radiation source for producing a light beam, a detector for measuring the reflected light beam and means for processing a signal of the detector, the device being arranged to measure the amount of at least one component in a coating.
fn a manufacturing process it is important to monitor the amount of coating on a moving substrate, such as paper or cardboard web. Coating im-proves the printing quality of paper, and the amount of coating should, if pos-sible, be kept constant in one paper grade. The coating materials consist of binders and coating pigments. Most common coating pigments used in coating are kaolin, calcium carbonate and titanium dioxide. During a paper manufac-turing process the amount of coating is in general continuously measured by measuring devices moving in cross direction of the paper perpendicularly over the paper web as the web moves forward.
US patent 5 455 422 describes a method in which the amount of coating is measured by measuring, for example, the absorption peak of latex at a wavelength of 2.30 micrometers and the absorption peak of clay at a wavelength of 2.21 micrometers. Said patent further describes the measure-ment of calcium carbonate by measuring the amount of backscattering at a wavelength of 2.09 micrometers. However, for measuring the amount of cal-cium carbonate said method is unreliable and inaccurate, since the method is based on a weak cellulose absorption coverage effect caused by the coating and dependent on multiple factors and not on the absorption caused by car-bonate. The amount of calcium carbonate could also be determined, for ex-ample, on the basis of kaolin measurement assuming that the ratio between the amounts of kaolin and calcium carbonate in a coating is constant. How-ever, this is not always the case, and problems are created particularly if the kaolin content is low i.e. below approximately 20% and the carbonate content correspondingly high i.e. approximately 80%.
EP publication 0 332 018 shows a method in which the amount of WO 99141590 ~ PCTlF199l00098 kaolin in paper is measured by transmission measurement, for example, at wavelengths of about 1.4 and 2.2 micrometers. However, by transmission measurement the portion of coating in the measurement result is very difficult to determine. Furthermore, the portion of calcium carbonate has to be ap-proximated as shown in the previous chapter.
GB publication 2 127 541 shows how transmission measurement is used for measuring the amount of additives in paper. The publication de-scribes how the amount of calcium carbonate is measured by measuring the absorption peaks at wavelengths of 11.54 micrometers and 11.77 microme-ters. The amount of coating cannot be measured by said method, since the fillers in base paper are included in the results. Furthermore, the absorption of paper can be so high that measurement through paper is not possible. More-over, i~~ ifs entirety, the accuracy of the measurement results is not good enough.
!t is an object of the present invention to provide a method in which the above drawbacks can be avoided.
The method of the invention is characterized by measuring the amount of calcium carbonate by measuring ar7 absorption peak of calcium carbonate at a wavelength of about 3.95 micrometers.
The device of the invention is further characterized by being ar-ranged to measure the amount of calcium carbonate from the coating by measuring an absorption peak of calcium carbonate at a wavelength of about 3.95 micrometers.
The essential idea of the invention is to measure the compcnents of the coating by reflection measurement so as to measure the amount of cal-cium carbonate by measuring the absorption peak of calcium carbonate at a wavelength of about 3.95 micrometers and/or the amount of kaolin by meas-uring the absorption peak of kaolin at a wavelength of about 2.7 micrometers.
The invention has the advantage that the amount of calcium car bonate and kaolin can be measured accurately and reliably, simultaneously in the same measurement or separately in different measurements. It is also possible to measure the total amount of calcium carbonate and kaolin from several applications on top of one another. The selectivity of the measurement for both calcium carbonate and kaolin is very good.
In the following, the invention will be described in greater detail in the accompanying drawings, in which ._..._a.___~._~~. _..._ ._.,._~._~.__._. ~ n....
Figure 1 is a schematic view showing a measuring device of the in-vention, Figure 2 shows spectra of base paper and paper coated with cal-cium carbonate, and Figure 3 shows spectra of base paper and paper coated with kaolin.
Figure 1 shows a measuring arrangement where radiation reflected from an object is measured, i.e. the radiation source and the receiver are on the same side of the object to be measured. Said measurement is referred to as reflection measurement.
Figure 1 shows a measuring device comprising a radiation source 1 producing a light beam 2. The radiation source 1 may be, for example, a halo-gen lamp or another suitable radiation source for producing an infrared beam.
The light beam 2 is directed through a filter 3. The filter 3 filters the light so that only the light that is essential for the measurement and that is at the right wavelength band enters the measurement point. The filter 3 may be, for ex-ample; a rotating filter disc including several interference filters or another filter solution known per se. The structure of the filter 3 is as such known for those skilled in the art, and is therefore not explained in greater detail in this context.
After the filter 3 the light beam 2 is directed through a window 5 to a paper or cardboard web 4 moving in the paper machine. The window 5 can be made of quartz glass or sapphire, for example. The paper or cardboard web 4 moves in the direction of arrow A. A coating 4a is arranged on the surface of the paper or cardboard web 4. Instead of the moving paper or cardboard web 4, the moving substrate, the coatings of which are measured, may also be, for ex-ample, a roll of a paper coating machine, a roll of a paper machine and/or generally a surface of a metal plate. The device also comprises a reference sample 6 which is moved at given intervals to the measurement point as indi-cated by arrow B. The sample 6 operates as a reflection reference and the measurement result obtained therefrom provides a picture of the condition of the light source 1, the detector 7 and the window 5. In addition, reference measurement can, if desired, be used to correct the actual measurement re-sult.
The reflected light beam 2 is directed to a detector 7. From the de-tector 7 the signals are directed through a preamplifier 8 to a computer 9 for processing the measured data in a manner known per se. For the sake of clarity, Figure 1 does not show the optics possibly needed to direct the light beam 2. The structure used for conductinglguiding the fight may be, for exam-ple, visualizing optics, an optical fiber or a bundle of optical fibers.
in Figure 2, curve C shows a reflection spectrum of base paper and curve D, indicated by a dashed line, shows the reflection spectrum of paper coated with calcium carbonate. The wavelength ?~ in micrometers is on the horizontal axis and the absorbency is on the vertical axis. When the spectra were measured, an absorption peak E was unexpectedly found for calcium carbonate at a wavelength range of 3.95 micrometers. By arranging the de-vice according to Figure 1 to measure the absorption peak at a wavelength of about 3.95 micrometers, the device can measure the amount of calcium car-bonate.
Suitable reference wavelengths for measuring calcium carbonate are, for example, 4.55 micrometers and/or 3.7 micrometers. The suitable ref-erence wavelengths for kaolin are, in turn, for example 2.64 micrometers andlor 2.8 micrometers. It should be noted that any reference wavelengths close to the actual measurement peak can be used as reference wavelengths.
What is essential is that the absorbencies of base paper or coated paper are equal or nearly equal at said wavelength range. The wavelength 3.7 mi-crometers is particularly advantageous, since it can be used as reference also for measuring the amount of water. It is advantageous to measure the amount of water at a wavelength of about 3.175 micrometers.
The measurements performed show that the reflectivity increases in the range over 6.3 micrometers, when the basis weight of carbonate was in-creased. But in the range under 6.3 micrometers the reflectivity decreases, when the basis weight of carbonate was increased, the absorption measure-ment thus functioning reliably in this range.
)n Figure 3, curve F shows the reflection spectrum of base paper and curve G, indicated by a dashed line, shows the reflection spectrum of kao-lin coated paper. Figure 3 also shows the wavelength ?~ in micrometers on the horizontal axis and the absorbency on the vertical axis. When the spectra were measured, an absorption peak H was unexpectedly found for kaolin at a wavelength range of about 2.7 micrometers. By arranging the device accord-ing to Figure 1 to measure the absorption peak at a wavelength of about 2.7 micrometers, the amount of kaolin in the coating can be determined.
As for the properties affecting the signal-to-noise ratio of the radia-tion source, the windows and the detectors and the price of the device, a measurement wavelength of 3.95 micrometers is advantageous for measuring the amount of calcium carbonate. Furthermore, the measurement of the amount of carbonate at a wavelength range of 3.95 micrometers can be im plemented in the same meter as the measurement of the absorption peak of 5 kaolin at 2.7 micrometers.
The drawing and the description associated thereto are merely in-tended to illustrate the idea of the invention. As for the details the invention may vary within the scope of the appended claims.
MOVING SUBSTRATE
The invention relates to a method for measuring the amount of coating on a moving substrate, the method comprising measuring the amount of at least one component in a coating by reflection measurement.
The invention also relates to a device for measuring the amount of coating on a moving substrate, the device comprising a radiation source for producing a light beam, a detector for measuring the reflected light beam and means for processing a signal of the detector, the device being arranged to measure the amount of at least one component in a coating.
fn a manufacturing process it is important to monitor the amount of coating on a moving substrate, such as paper or cardboard web. Coating im-proves the printing quality of paper, and the amount of coating should, if pos-sible, be kept constant in one paper grade. The coating materials consist of binders and coating pigments. Most common coating pigments used in coating are kaolin, calcium carbonate and titanium dioxide. During a paper manufac-turing process the amount of coating is in general continuously measured by measuring devices moving in cross direction of the paper perpendicularly over the paper web as the web moves forward.
US patent 5 455 422 describes a method in which the amount of coating is measured by measuring, for example, the absorption peak of latex at a wavelength of 2.30 micrometers and the absorption peak of clay at a wavelength of 2.21 micrometers. Said patent further describes the measure-ment of calcium carbonate by measuring the amount of backscattering at a wavelength of 2.09 micrometers. However, for measuring the amount of cal-cium carbonate said method is unreliable and inaccurate, since the method is based on a weak cellulose absorption coverage effect caused by the coating and dependent on multiple factors and not on the absorption caused by car-bonate. The amount of calcium carbonate could also be determined, for ex-ample, on the basis of kaolin measurement assuming that the ratio between the amounts of kaolin and calcium carbonate in a coating is constant. How-ever, this is not always the case, and problems are created particularly if the kaolin content is low i.e. below approximately 20% and the carbonate content correspondingly high i.e. approximately 80%.
EP publication 0 332 018 shows a method in which the amount of WO 99141590 ~ PCTlF199l00098 kaolin in paper is measured by transmission measurement, for example, at wavelengths of about 1.4 and 2.2 micrometers. However, by transmission measurement the portion of coating in the measurement result is very difficult to determine. Furthermore, the portion of calcium carbonate has to be ap-proximated as shown in the previous chapter.
GB publication 2 127 541 shows how transmission measurement is used for measuring the amount of additives in paper. The publication de-scribes how the amount of calcium carbonate is measured by measuring the absorption peaks at wavelengths of 11.54 micrometers and 11.77 microme-ters. The amount of coating cannot be measured by said method, since the fillers in base paper are included in the results. Furthermore, the absorption of paper can be so high that measurement through paper is not possible. More-over, i~~ ifs entirety, the accuracy of the measurement results is not good enough.
!t is an object of the present invention to provide a method in which the above drawbacks can be avoided.
The method of the invention is characterized by measuring the amount of calcium carbonate by measuring ar7 absorption peak of calcium carbonate at a wavelength of about 3.95 micrometers.
The device of the invention is further characterized by being ar-ranged to measure the amount of calcium carbonate from the coating by measuring an absorption peak of calcium carbonate at a wavelength of about 3.95 micrometers.
The essential idea of the invention is to measure the compcnents of the coating by reflection measurement so as to measure the amount of cal-cium carbonate by measuring the absorption peak of calcium carbonate at a wavelength of about 3.95 micrometers and/or the amount of kaolin by meas-uring the absorption peak of kaolin at a wavelength of about 2.7 micrometers.
The invention has the advantage that the amount of calcium car bonate and kaolin can be measured accurately and reliably, simultaneously in the same measurement or separately in different measurements. It is also possible to measure the total amount of calcium carbonate and kaolin from several applications on top of one another. The selectivity of the measurement for both calcium carbonate and kaolin is very good.
In the following, the invention will be described in greater detail in the accompanying drawings, in which ._..._a.___~._~~. _..._ ._.,._~._~.__._. ~ n....
Figure 1 is a schematic view showing a measuring device of the in-vention, Figure 2 shows spectra of base paper and paper coated with cal-cium carbonate, and Figure 3 shows spectra of base paper and paper coated with kaolin.
Figure 1 shows a measuring arrangement where radiation reflected from an object is measured, i.e. the radiation source and the receiver are on the same side of the object to be measured. Said measurement is referred to as reflection measurement.
Figure 1 shows a measuring device comprising a radiation source 1 producing a light beam 2. The radiation source 1 may be, for example, a halo-gen lamp or another suitable radiation source for producing an infrared beam.
The light beam 2 is directed through a filter 3. The filter 3 filters the light so that only the light that is essential for the measurement and that is at the right wavelength band enters the measurement point. The filter 3 may be, for ex-ample; a rotating filter disc including several interference filters or another filter solution known per se. The structure of the filter 3 is as such known for those skilled in the art, and is therefore not explained in greater detail in this context.
After the filter 3 the light beam 2 is directed through a window 5 to a paper or cardboard web 4 moving in the paper machine. The window 5 can be made of quartz glass or sapphire, for example. The paper or cardboard web 4 moves in the direction of arrow A. A coating 4a is arranged on the surface of the paper or cardboard web 4. Instead of the moving paper or cardboard web 4, the moving substrate, the coatings of which are measured, may also be, for ex-ample, a roll of a paper coating machine, a roll of a paper machine and/or generally a surface of a metal plate. The device also comprises a reference sample 6 which is moved at given intervals to the measurement point as indi-cated by arrow B. The sample 6 operates as a reflection reference and the measurement result obtained therefrom provides a picture of the condition of the light source 1, the detector 7 and the window 5. In addition, reference measurement can, if desired, be used to correct the actual measurement re-sult.
The reflected light beam 2 is directed to a detector 7. From the de-tector 7 the signals are directed through a preamplifier 8 to a computer 9 for processing the measured data in a manner known per se. For the sake of clarity, Figure 1 does not show the optics possibly needed to direct the light beam 2. The structure used for conductinglguiding the fight may be, for exam-ple, visualizing optics, an optical fiber or a bundle of optical fibers.
in Figure 2, curve C shows a reflection spectrum of base paper and curve D, indicated by a dashed line, shows the reflection spectrum of paper coated with calcium carbonate. The wavelength ?~ in micrometers is on the horizontal axis and the absorbency is on the vertical axis. When the spectra were measured, an absorption peak E was unexpectedly found for calcium carbonate at a wavelength range of 3.95 micrometers. By arranging the de-vice according to Figure 1 to measure the absorption peak at a wavelength of about 3.95 micrometers, the device can measure the amount of calcium car-bonate.
Suitable reference wavelengths for measuring calcium carbonate are, for example, 4.55 micrometers and/or 3.7 micrometers. The suitable ref-erence wavelengths for kaolin are, in turn, for example 2.64 micrometers andlor 2.8 micrometers. It should be noted that any reference wavelengths close to the actual measurement peak can be used as reference wavelengths.
What is essential is that the absorbencies of base paper or coated paper are equal or nearly equal at said wavelength range. The wavelength 3.7 mi-crometers is particularly advantageous, since it can be used as reference also for measuring the amount of water. It is advantageous to measure the amount of water at a wavelength of about 3.175 micrometers.
The measurements performed show that the reflectivity increases in the range over 6.3 micrometers, when the basis weight of carbonate was in-creased. But in the range under 6.3 micrometers the reflectivity decreases, when the basis weight of carbonate was increased, the absorption measure-ment thus functioning reliably in this range.
)n Figure 3, curve F shows the reflection spectrum of base paper and curve G, indicated by a dashed line, shows the reflection spectrum of kao-lin coated paper. Figure 3 also shows the wavelength ?~ in micrometers on the horizontal axis and the absorbency on the vertical axis. When the spectra were measured, an absorption peak H was unexpectedly found for kaolin at a wavelength range of about 2.7 micrometers. By arranging the device accord-ing to Figure 1 to measure the absorption peak at a wavelength of about 2.7 micrometers, the amount of kaolin in the coating can be determined.
As for the properties affecting the signal-to-noise ratio of the radia-tion source, the windows and the detectors and the price of the device, a measurement wavelength of 3.95 micrometers is advantageous for measuring the amount of calcium carbonate. Furthermore, the measurement of the amount of carbonate at a wavelength range of 3.95 micrometers can be im plemented in the same meter as the measurement of the absorption peak of 5 kaolin at 2.7 micrometers.
The drawing and the description associated thereto are merely in-tended to illustrate the idea of the invention. As for the details the invention may vary within the scope of the appended claims.
Claims (12)
1. A method for measuring the amount of coating on a moving substrate, the method comprising measuring the amount of at least one component in a coating by reflection measurement, characterized by measuring the amount of calcium carbonate by measuring an absorption peak of calcium carbonate at a wavelength of about 3.95 micrometers
2. A method as claimed in claim 1, characterized by measuring a reference value for the measurement of the absorption peak of calcium carbonate at a wavelength of about 3.7 micrometers.
3. A method as claimed in claim 1 or 2, characterized by measuring the amount of kaolin by measuring an absorption peak of kaolin at a wavelength of about 2.7 micrometers.
4. A method as claimed in claim 3, characterized by measuring a reference value for the measurement of the absorption peak of kaolin at a wavelength of about 2.64 micrometers.
5. A method as claimed in any one of the preceding claims, characterized by measuring the amount of water at a wavelength of about 3.175 micrometers.
6. A method as claimed in claim 5, characterized by measuring a reference value for measuring the amount of water at a wave-length of about 3.7 micrometers.
7. A method as claimed in any one of the preceding claims, characterized by the moving substrate being a paper or cardboard web (4).
8. A method as claimed in any one of the preceding claims, characterized by continuously measuring the amount of coating.
9. A device for measuring the amount of coating on a moving substrate, the device comprising a radiation source (1) for producing a light beam (2), a detector (7) for measuring the reflected light beam (2) and means for processing a signal of the detector (7), the device being arranged to measure the amount of at least one component in a coating (4a}, characterized by being arranged to measure the amount of calcium carbonate from the coating (4a) by measuring an absorption peak of calcium carbonate at a wavelength of about 3.95 micrometers.
10. A device as claimed in claim 9, characterized by being arranged to measure the amount of kaolin from the coating (4a) by measuring an absorption peak of kaolin at a wavelength of about 2.7 micrometers.
11. A device as claimed in claim 9 or 10, characterized by being arranged to continuously measure the amount of coating.
12. A device as claimed in any one of the claims 9-11, characterized by the moving substrate being a paper or cardboard web (4).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI980323A FI108811B (en) | 1998-02-12 | 1998-02-12 | Method and apparatus for measuring the amount of coating on a moving surface |
| FI980323 | 1998-02-12 | ||
| PCT/FI1999/000098 WO1999041590A1 (en) | 1998-02-12 | 1999-02-10 | Method and device for measuring the amount of coating on a moving substrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2320941A1 true CA2320941A1 (en) | 1999-08-19 |
Family
ID=8550827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002320941A Abandoned CA2320941A1 (en) | 1998-02-12 | 1999-02-10 | Method and device for measuring the amount of coating on a moving substrate |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1055114A1 (en) |
| AU (1) | AU2282999A (en) |
| CA (1) | CA2320941A1 (en) |
| FI (1) | FI108811B (en) |
| WO (1) | WO1999041590A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI110638B (en) * | 1998-10-06 | 2003-02-28 | Metso Paper Automation Oy | Method and apparatus for measuring the amount of silicone coating on a moving surface |
| US6441375B1 (en) | 2000-01-06 | 2002-08-27 | Eurotherm Gauging Systems, Inc. | Method and apparatus for automated on-line substrate independent calibration and measurement spectral analysis |
| FI115856B (en) * | 2000-02-10 | 2005-07-29 | Metso Automation Oy | Method and apparatus for measuring coating |
| FI109926B (en) * | 2001-04-20 | 2002-10-31 | Valmet Raisio Oy | Method and system for controlling the coating recipe |
| DE102004003042A1 (en) * | 2004-01-20 | 2005-08-18 | Voith Paper Patent Gmbh | Basis weight of the cover layer of a fibrous web |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2127541B (en) * | 1982-09-27 | 1986-08-20 | Imp Group Plc | Monitoring sheet material |
| US4755501A (en) * | 1984-05-18 | 1988-07-05 | Amoco Corporation | Color developing composition for carbonless paper copying system |
| CA1319273C (en) * | 1988-03-10 | 1993-06-22 | Steven Perry Sturm | Clay sensor |
| US5338361A (en) * | 1991-11-04 | 1994-08-16 | Measurex Corporation | Multiple coat measurement and control apparatus and method |
| JP2001513880A (en) * | 1997-02-13 | 2001-09-04 | ファルメット・オートメーション・インク | Method for measuring components of a coating on a moving substrate |
| US5795394A (en) * | 1997-06-02 | 1998-08-18 | Honeywell-Measurex | Coating weight measuring and control apparatus |
-
1998
- 1998-02-12 FI FI980323A patent/FI108811B/en not_active IP Right Cessation
-
1999
- 1999-02-10 CA CA002320941A patent/CA2320941A1/en not_active Abandoned
- 1999-02-10 AU AU22829/99A patent/AU2282999A/en not_active Abandoned
- 1999-02-10 EP EP99902585A patent/EP1055114A1/en not_active Withdrawn
- 1999-02-10 WO PCT/FI1999/000098 patent/WO1999041590A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| AU2282999A (en) | 1999-08-30 |
| FI108811B (en) | 2002-03-28 |
| WO1999041590A1 (en) | 1999-08-19 |
| EP1055114A1 (en) | 2000-11-29 |
| FI980323A0 (en) | 1998-02-12 |
| FI980323A (en) | 1999-08-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4879471A (en) | Rapid-scanning infrared sensor | |
| US4703187A (en) | Method and apparatus for the determination of the thickness of transparent layers of lacquer | |
| US5124552A (en) | Sensor and method for measuring web moisture with optimal temperature insensitivity over a wide basis weight range | |
| US9024259B2 (en) | Method and apparatus for electromagnetic detection for use in the manufacture of fibrous web | |
| JP4664971B2 (en) | Measurement of thin film thickness using a multi-channel infrared sensor | |
| US4966455A (en) | Real time mottle measuring device and method | |
| US11739479B2 (en) | Yankee dryer profiler and control | |
| CA2399632C (en) | Method and apparatus for measuring coating | |
| EP2028476B1 (en) | System and method for measurement of degree of moisture stratification in a paper or board | |
| US4812665A (en) | Method and apparatus for measuring of humidity | |
| US9201018B2 (en) | Optimized spatial resolution for a spectroscopic sensor | |
| CA2300095A1 (en) | Method and apparatus for measuring properties of paper | |
| CA2320941A1 (en) | Method and device for measuring the amount of coating on a moving substrate | |
| EP0160304A2 (en) | Method and apparatus for measuring the fiber orientation of papers | |
| CA2376491C (en) | Method and apparatus for measuring properties of paper web | |
| CA2346480C (en) | Measuring amount of silicone coating on paper web | |
| JPH11237377A (en) | Apparatus for measuring quality of paper or sheet | |
| US20160032527A1 (en) | Yankee drier profiler and control | |
| US5506407A (en) | High resolution high speed film measuring apparatus and method | |
| US20030132387A1 (en) | Method and device for measuring the amount of coating on a moving substrate | |
| CA2279904C (en) | Method for measuring the components of a coating on a moving base material | |
| JPH11173984A (en) | Method and apparatus for computing sugar content in central part in nondestructive measurement of sugar content of fruit or vegetable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |