Patent US6993408B2 successfully refreshed from Google Patents.
US6993408B2
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US
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Method for the control of quality in a paper web
Assignee: Valmet Technologies Oy
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Filing: 2003-05-01
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Granted: 2006-01-31
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Expires: 2023-05-01
Abstract
Abstract Paper quality is controlled in the production of a paper web, where paper stock is fed from the headbox of the paper machine onto the wire section, whereby the paper stock is formed into a paper web. The headbox flow rate and consistency are measured from the paper stock fed into the headbox, and the water quantities removed on the wire section during the formation of the paper web are measured on the wire section. In the method, a filler distribution model is established, into which data on the wire section geometry, measured headbox flow rate and consistency and on the water quantities removed on the wire section are entered, and the model is used for establishing an estimate of the filler distribution, and the running values of the paper machine are adjusted on the basis of the estimated filler distribution.
Inventors
- 👤 Ari Puurtinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:16
CPC Classifications
D; D21; D21G; D21G9/00; D21G9/0009; D21G9/0027; D21F; D21F9/00; D21F9/003
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
153 words
A Method for the control of quality in a paper web in the production of a paper web, of the type where paper stock is fed from the headbox of the paper machine onto a wire section, whereby the paper stock is formed into a paper web and where the headbox flow rate and consistency are measured from the paper stock fed into the headbox and where the water quantities removed on the wire section during the formation of the paper web are measured on the wire section, the improvement comprising: a filler distribution model into which data on the wire section geometry, measured headbox flow rate and consistency, and on the water quantities removed on the wire section are entered, and wherein the model is used for establishing an estimate of the filler distribution and where the running values of the paper machine are adjusted by means of the estimated filler distribution.
Claim 2
Independent Claim
153 words
A Method for the control of quality in a paper web in the production of a paper web, of the type where paper stock is fed from the headbox of the paper machine onto a wire section, whereby the paper stock is formed into a paper web and where the headbox flow rate and consistency are measured from the paper stock fed into the headbox and where the water quantities removed on the wire section during the formation of the paper web are measured on the wire section, the improvement comprising: a filler distribution model into which data on the wire section geometry, measured headbox flow rate and consistency, and on the water quantities removed on the wire section are entered, and wherein the model is used for establishing an estimate of the filler distribution and where the running values of the paper machine are adjusted by means of the estimated filler distribution.
Claim 3
Dependent Claim
51 words
The method of claim 1 , wherein the water quantities removed on the wire section are measured at roll dewatering locations and at blade dewatering locations and wherein the two-sidedness of dewatering is determined on the basis of the measurement results and wherein the two-sidedness determined is entered in the model.
Claim 4
Independent Claim
216 words
A Method for the control of quality in a paper web in the production of a paper web, of the type where paper stock is fed from the headbox of the paper machine onto a wire section, whereby the paper stock is formed into a paper web and where the headbox flow rate and consistency are measured from the paper stock fed into the headbox and where the water quantities removed on the wire section during the formation of the paper web are measured on the wire section, the improvement comprising: a filler distribution model into which data on the wire section geometry, measured headbox flow rate and consistency, and on the water quantities removed on the wire section are entered, and wherein the model is used for establishing an estimate of the filler distribution and where the running values of the paper machine are adjusted by means of the estimated filler distribution, wherein the model is based on mathematical expressions of parameters describing the symmetry and shape of filler distribution: Fsym=f(Pu, Psym, FRvac, LBvac, LBf, HBX, Q) Fu=f(Pu, Psym, FRvac, LBvac, LBf, HBX, Q) where: Psym=symmetry coefficient for polymer dosage Pu=shape coefficient for polymer dosage FRvac=vacuum of forming roll, kPa HBX=headbox outlet geometry LBvac=suction box vacuum LBf=load force of loading elements Q=headbox flow rate, l/s*m.
Claim 5
Independent Claim
216 words
A Method for the control of quality in a paper web in the production of a paper web, of the type where paper stock is fed from the headbox of the paper machine onto a wire section, whereby the paper stock is formed into a paper web and where the headbox flow rate and consistency are measured from the paper stock fed into the headbox and where the water quantities removed on the wire section during the formation of the paper web are measured on the wire section, the improvement comprising: a filler distribution model into which data on the wire section geometry, measured headbox flow rate and consistency, and on the water quantities removed on the wire section are entered, and wherein the model is used for establishing an estimate of the filler distribution and where the running values of the paper machine are adjusted by means of the estimated filler distribution, wherein the model is based on mathematical expressions of parameters describing the symmetry and shape of filler distribution: Fsym=f(Pu, Psym, FRvac, LBvac, LBf, HBX, Q) Fu=f(Pu, Psym, FRvac, LBvac, LBf, HBX, Q) where: Psym=symmetry coefficient for polymer dosage Pu=shape coefficient for polymer dosage FRvac=vacuum of forming roll, kPa HBX=headbox outlet geometry LBvac=suction box vacuum LBf=load force of loading elements Q=headbox flow rate, l/s*m.
Claim 6
Dependent Claim
32 words
The method of claim 1 , wherein the filler distribution estimate obtained by means of the model is used for controlling the running values of the paper machine to achieve successful coating.
Claim 7
Dependent Claim
33 words
The method of claim 1 , wherein boundary values used in the model are the furnish used in the fiber web machine, dewatering on the wire section, and headbox ash consistency/flow rate consistency.
Claim 8
Dependent Claim
33 words
The method of claim 1 , wherein an operator adjusts the headbox flow rate, vacuums applied in the dewatering equipment, loading used in blade dewatering, and/or wire section geometry based on the model.
Claim 9
Dependent Claim
46 words
The method of claim 1 , wherein the quantity of a material chosen from the group consisting of: fillers, fines, and additives which is fed to different layers of a multi-layer headbox is adjusted on the basis of the filler distribution estimate obtained from the model.
Claim 10
Independent Claim
124 words
A Method for the control of quality in a paper web in the production of a paper web, comprising the steps of feeding paper stock from a headbox of a paper machine onto a wire section, whereby the paper stock is formed into a paper web; measuring headhox flow rate; measuring headbox consistency; measuring quantities of water removed on the wire section; entering the measured headbox flow rate, headbox consistency, and quantities of water removed on the wire section, and data on the wire section geometry, into a filler distribution model; using the filler distribution model to establish an estimate of the filler distribution in the thickness direction of the web; and adjusting the running values of the paper machine based on the estimate.
Claim 11
Independent Claim
124 words
A Method for the control of quality in a paper web in the production of a paper web, comprising the steps of feeding paper stock from a headbox of a paper machine onto a wire section, whereby the paper stock is formed into a paper web; measuring headhox flow rate; measuring headbox consistency; measuring quantities of water removed on the wire section; entering the measured headbox flow rate, headbox consistency, and quantities of water removed on the wire section, and data on the wire section geometry, into a filler distribution model; using the filler distribution model to establish an estimate of the filler distribution in the thickness direction of the web; and adjusting the running values of the paper machine based on the estimate.
Claim 12
Dependent Claim
60 words
The method of claim 8 , wherein the step of measuring water quantities removed on the wire section includes the steps of measuring water quantities removed at roll dewatering locations and at blade dewatering locations, and wherein the two-sidedness of dewatering is determined on the basis of the measurement results and wherein the two-sidedness determined is entered in the model.
Claim 13
Dependent Claim
52 words
The method of claim 8 , wherein the step of adjusting the running values of the paper machine based on the estimate comprises the steps of adjusting headbox flow rate; adjusting vacuums applied in the dewatering equipment; and adjusting loading used in blade dewatering, and/or wire section geometry based on the model.
Claim 14
Dependent Claim
40 words
The method of claim 8 , wherein the quantity of a material chosen from the group consisting of: fillers, fines, and additives which is fed to different layers of a multi-layer headbox is adjusted on the basis of the estimate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2009-01-30 | 2009-08-01 | 2010-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-01-30 | 2013-08-01 | 2014-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-01-30 | 2017-08-01 | 2018-01-31 | $7700.00 | Window Closed / Lapsed |