US20020066545A1 - Method for monitoring quality of paper web - Google Patents

Method for monitoring quality of paper web Download PDF

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Publication number
US20020066545A1
US20020066545A1 US09/916,410 US91641001A US2002066545A1 US 20020066545 A1 US20020066545 A1 US 20020066545A1 US 91641001 A US91641001 A US 91641001A US 2002066545 A1 US2002066545 A1 US 2002066545A1
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US
United States
Prior art keywords
paper web
web
paper
treatment process
coating
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
Application number
US09/916,410
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English (en)
Inventor
Jari-Matti Karjanmaa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metso Paper Automation Oy
Original Assignee
Metso Paper Automation Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metso Paper Automation Oy filed Critical Metso Paper Automation Oy
Assigned to METSO PAPER AUTOMATION OY reassignment METSO PAPER AUTOMATION OY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KARJANMAA, JARI-MATTI
Publication of US20020066545A1 publication Critical patent/US20020066545A1/en
Priority to US10/842,255 priority Critical patent/US20050008765A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/72—Investigating presence of flaws
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/34—Paper
    • G01N33/346—Paper sheets

Definitions

  • the invention relates to a method for monitoring the quality of a paper web in a continuous process in which the paper web exiting the paper manufacturing machine is conveyed for subsequent treatment.
  • a paper web being manufactured on a paper machine can be treated in a variety of ways even when the web is relatively dry. For instance, when manufacturing common newsprint, its surface is smoothed with a so-called machine calender, whereby sufficient surface smoothness for printing is achieved quickly and economically without coating.
  • Certain magazine paper grades in turn require coated paper, and hence the paper web is coated with coating paste that may contain, for instance, china clay or talcum. Very often the coated paper grades are also calendered after coating in order to smooth them.
  • the web is smoothed as it exits the paper machine.
  • online coating the web exiting the paper machine is conveyed directly to a coating unit and then to a calendering unit to produce a finished coated web.
  • Frequent problems that can occur in manufacturing and subsequent treatment of the web include the formation of wet spots and patches where the web is unbroken but wetter than desired. These result in web curling and waviness in the final product.
  • problems with runability and consequently interruptions in production can occur as a result of small-scale variations in the amount of coating applied, which results from the fact that the coating attaches to dry areas of the web in a different manner than to wet spots. Because this coating variation is irregular in occurrence, it may go undetected in laboratory tests.
  • the coating applied over wet spots in the web may not properly adhere to the base paper of the web, and may become detached in the calendering stage and stick to the polymer surface of a calender roll. This can cause a hot area to form on the polymer surface of the roll and destroy the roll's polymer surface material.
  • Irregular and rapid deviations may also occur in coating, which are a common cause of quality variations in coated papers.
  • the coating material may stick to the calender rolls if it is not fully dried, since drying of the coating is commonly carried out according to an average amount of coating, and hence areas of coating that are thicker than average may not fully dry before calendering is performed. With time, this may damage the roll's surface material and necessitate a roll change.
  • the CD or MD profile of the paper may also vary excessively. These profile defects may be produced in the wire section as a result of wire or felt congestion, or in the press section, e.g., by the action of fouled press rolls. These conditions affect the paper formation and thereby the paper profile. In the drying section, suction rolls may produce streaks in the web and thereby affect the profile.
  • Defect detectors used in paper mills are often based on visible light or on measuring the temperature and moisture of the web. These measurements are typically performed with slow-response, spot-like sensors. These enable monitoring of long-term variations in the web, but quickly changing defects and deviations remain unnoticed in practice.
  • German Patent DE 19 63 2988 discloses a solution, in which clearly visible defects, such as tears, light or dark spots, etc., are sought in the web with a conventional video camera by means of bright light.
  • This publication also discloses a solution in which the web is monitored either by a conventional IR sensor beam or conventional CCD cameras in order to find similar defects visible to the naked eye and to mark them in the web by spraying a marking substance on the areas of defects.
  • these solutions described in the publication do not allow monitoring moisture defects in the web or variations in the amounts of coating, both of which are often extremely harmful.
  • the object of the present invention is to provide a method by which the web quality can be monitored more reliably than previously and the causes of various defects can be found in fault situations, whereby they can be eliminated.
  • the moving paper web exiting the paper manufacturing machine is imaged on a continual basis with a thermal camera prior to and/or after a subsequent treatment process for the web in order to detect defects in the paper web, and on the basis of the detected defects the manufacturing process of the paper web and/or the treatment process is adjusted.
  • the paper web is conveyed from the paper machine directly to a coating unit.
  • the web is monitored substantially continuously with a camera operating within an infrared region, preferably from 3 to 12 micrometers in wavelength. Monitoring can be implemented both as continuous imaging displayed on a monitor and as recording of a camera image such that when a defect or a possible damage appears, it is possible to find the cause of the defect so that it can be eliminated in one way or another.
  • One preferred embodiment of the invention employs a camera that shows a continuous, non-stop picture of the web.
  • Another preferred embodiment of the invention employs a camera that takes a so-called still picture of the web at suitably frequent intervals so that if a defect appears it can be quickly addressed in an appropriate manner.
  • the invention is applicable to quality control of the web that is already coated or is being coated.
  • An advantage of the invention is that the quality of the finished web product can be ensured. At the same time, it is possible to quickly get information on undesirable deviations occurring in the process and on the basis thereof the process can be quickly adjusted. Likewise, in situations that may have serious consequences the process can be stopped, the calender can be opened quickly if necessary, or other appropriate action can be taken, in order to minimize the cost incurred.
  • the method of the invention further allows detecting possible, dangerous deviations in the web in conjunction with online calendering and thus tracing the origin of the deviation.
  • FIG. 1 shows a schematic view of equipment applicable to the implementation of the method of the invention
  • FIGS. 2 a and 2 b are images of quality deviations in an uncoated web detected with the equipment of FIG. 1;
  • FIG. 3 shows deviations in the uncoated web detected after so-called intermediate calendering
  • FIG. 4 shows the web at the coating station
  • FIG. 5 shows the coated web
  • FIG. 1 is a schematic view of equipment applicable to the implementation of the method of the invention.
  • an uncoated web 1 exiting a paper machine is conveyed to a coating unit 2 .
  • a coating 3 is applied onto the surface of the web 1 , whereafter the coated web is conveyed to a calendering unit 4 and therefrom to further processing.
  • coating is applied on the web and spread such that the coating layer on the web is substantially even.
  • the coated web is conveyed between hot rolls such that it becomes as even as possible and dries further.
  • the calender rolls are coated with a polymer surface material that is sufficiently elastic and enables even pressing during the calendering.
  • the equipment comprises one or more cameras 5 and 6 operating within the infrared region. With these cameras the web 1 can be imaged before and/or after coating. From the camera or cameras 5 , 6 the image is conveyed to a monitor 7 , for instance, which the operation controller of the equipment can watch. Additionally or alternatively, the image can be conveyed to a recorder 8 that records the image provided by the camera or cameras substantially continuously.
  • FIGS. 2 a and 2 b show defects detected with the equipment of FIG. 1.
  • the images have been taken of the base paper of the web 1 before it is conveyed to a coating station.
  • FIG. 2 a shows how the moisture level of the web exiting a machine that is in need of service, for instance a machine having congested felts, can be high and variations can be considerable. Conventional online paper measuring devices based on spot detection cannot detect these defects.
  • FIG. 2 b shows an image of a paper web in which moisture variations are minor, which indicates that the felts and the paper machine are serviced and in good condition.
  • FIG. 3 shows narrow streaks of moisture in the web 1 , i.e., in the base paper. This image was taken of the web 1 after so-called intermediate calendering, and the narrow streaks of moisture indicated by reference numeral 9 are clearly visible. Black spots, indicated by reference numeral 10 , also appear in the image, which reveal irregular quality deviations in the web 1 .
  • FIG. 4 shows the web, i.e., the base paper, at the coating station, and the image reveals a number of different facts. Striping caused by the rolls is indicated with the reference numeral 9 as in FIG. 3. A marking 11 caused by a felt seam also appears in the image. A pattern 12 produced by latex spots on the opposite side of the web also appears in the image, which indicates defects in the coating.
  • the amount of coating varies in different parts of the web. In this case, there is clearly more coating in some areas than in others, and consequently, the coating dries more slowly in these areas than elsewhere in the paper. As a result, the coating may still be too wet in calendering, and hence the coating may stick to the calender roll's surface and cause damage over time.
  • the images shown herein by way of example were taken by a camera operating within an infrared region of 3 to 12 micrometers in wavelength.
  • the measuring regions are preferably from 3 to 5 micrometers or 8 to 12 micrometers, whereby various defects and deviations can be detected in a variety of ways.
  • the quality of the web to be coated is monitored substantially continuously with cameras operating within the infrared region either such that the web exiting the paper machine is monitored before coating or the quality of the coating material of the coated paper is monitored before calendering such that the manufacturing process of the paper web product can be adjusted either on the actual paper machine or in the treatment thereafter in order to obtain a product of as high quality as possible.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Paper (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
US09/916,410 1999-01-28 2001-07-27 Method for monitoring quality of paper web Abandoned US20020066545A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/842,255 US20050008765A1 (en) 1999-01-28 2004-05-10 Method for monitoring quality of paper web

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI990159 1999-01-28
FI990159A FI990159A (sv) 1999-01-28 1999-01-28 Förfarande för övervakning av en fiberbanas kvalitet
PCT/FI2000/000059 WO2000045156A1 (en) 1999-01-28 2000-01-28 Method for monitoring quality of paper web

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2000/000059 Continuation WO2000045156A1 (en) 1999-01-28 2000-01-28 Method for monitoring quality of paper web

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/842,255 Continuation US20050008765A1 (en) 1999-01-28 2004-05-10 Method for monitoring quality of paper web

Publications (1)

Publication Number Publication Date
US20020066545A1 true US20020066545A1 (en) 2002-06-06

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US09/916,410 Abandoned US20020066545A1 (en) 1999-01-28 2001-07-27 Method for monitoring quality of paper web
US10/842,255 Abandoned US20050008765A1 (en) 1999-01-28 2004-05-10 Method for monitoring quality of paper web

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US10/842,255 Abandoned US20050008765A1 (en) 1999-01-28 2004-05-10 Method for monitoring quality of paper web

Country Status (6)

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US (2) US20020066545A1 (sv)
EP (1) EP1155307A1 (sv)
AU (1) AU2442900A (sv)
CA (1) CA2359315A1 (sv)
FI (1) FI990159A (sv)
WO (1) WO2000045156A1 (sv)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030010460A1 (en) * 2001-07-13 2003-01-16 Joachim Grabscheid Method and device for monitoring the state of felt or of a screen
US10501274B2 (en) * 2017-07-06 2019-12-10 Honeywell International Inc. Continuous web sheet defect analytics, classification and remediation for enhancing equipment efficiency and throughput
JP2021161579A (ja) * 2020-04-02 2021-10-11 東芝三菱電機産業システム株式会社 色むら監視装置
WO2022115461A1 (en) * 2020-11-24 2022-06-02 Applied Materials, Inc. Optical device metrology systems and related methods
US11816893B1 (en) 2022-08-03 2023-11-14 Industrial Video Solutions Inc. Systems and methods for monitoring and controlling industrial processes
US20240044079A1 (en) * 2022-08-03 2024-02-08 Industrial Video Solutions Inc. Systems and methods for monitoring and controlling industrial processes

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI114741B (sv) * 2001-05-11 2004-12-15 Metso Automation Oy Förfarande för kontroll av kvalitet och tillstånd på basen av termografi
US20020176617A1 (en) * 2001-05-22 2002-11-28 Pti Advanced Filtration, Inc. System and method for continuous integrity testing of a material web
FI115163B (sv) 2001-11-29 2005-03-15 Metso Automation Oy Kvalitetes- och tillståndskontroll enligt spektrumdiskriminerande mätning
DE10260464A1 (de) * 2002-12-21 2004-07-01 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Betreiben einer Maschine zum Herstellen und/oder Veredeln einer Materialbahn
JP4698405B2 (ja) * 2005-12-20 2011-06-08 日本テトラパック株式会社 シール状態検査装置及びシール状態検査方法
FI121859B (sv) * 2008-11-25 2011-05-13 Metso Automation Oy Förfarande för att styra reparation av en bana med en omrullningsmaskin och motsvarande system
US9382660B2 (en) 2012-04-16 2016-07-05 Stora Enso Oyj Method for automatically determining stickies in a recycled fibre process
FI124434B (sv) * 2012-10-31 2014-08-29 Metso Automation Oy Förfarande och anordning för övervakning av bana
FI128403B (sv) 2013-07-05 2020-04-30 Procemex Oy Ltd Synkronisering av bildtagning
RU2700915C1 (ru) 2016-11-23 2019-09-23 Айбиэс Оф Америка Система контроля, система управления, приводной узел бумагоделательной машины и способ управления
AU2019353369A1 (en) 2018-10-01 2021-04-29 Maintech Co., Ltd. Monitoring system
US11920299B2 (en) 2020-03-06 2024-03-05 Ibs Of America Formation detection system and a process of controlling
CN111882562A (zh) * 2020-07-08 2020-11-03 谢超奇 纸箱整体湿度解析系统

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US5563809A (en) * 1994-04-06 1996-10-08 Abb Industrial Systems, Inc. Measurement/control of sheet material using at least one sensor array

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US4500968A (en) * 1982-06-29 1985-02-19 Domtar Inc. Paper machine wet line control
FI75887C (sv) * 1986-12-30 1991-03-06 Antti Johannes Niemi Förfarande och apparatur för kontroll av torrlinjen på planvirapappers maskin
US5118195A (en) * 1990-09-10 1992-06-02 Rkb Opto-Electrics, Inc. Area scan camera system for detecting streaks and scratches
DE4422861C2 (de) * 1994-06-30 1996-05-09 Honeywell Ag Vorrichtung zur Bestimmung von Materialeigenschaften von bewegtem blattförmigem Material
US5717456A (en) * 1995-03-06 1998-02-10 Champion International Corporation System for monitoring a continuous manufacturing process
US5696591A (en) * 1996-01-05 1997-12-09 Eastman Kodak Company Apparatus and method for detecting longitudinally oriented flaws in a moving web
DE19632988C1 (de) * 1996-08-15 1998-01-22 Stora Publication Paper Ag Verfahren zur Beseitigung von Papierfehlern bei der kontinuierlichen Papierherstellung

Patent Citations (1)

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US5563809A (en) * 1994-04-06 1996-10-08 Abb Industrial Systems, Inc. Measurement/control of sheet material using at least one sensor array

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030010460A1 (en) * 2001-07-13 2003-01-16 Joachim Grabscheid Method and device for monitoring the state of felt or of a screen
US10501274B2 (en) * 2017-07-06 2019-12-10 Honeywell International Inc. Continuous web sheet defect analytics, classification and remediation for enhancing equipment efficiency and throughput
JP2021161579A (ja) * 2020-04-02 2021-10-11 東芝三菱電機産業システム株式会社 色むら監視装置
JP7289278B2 (ja) 2020-04-02 2023-06-09 東芝三菱電機産業システム株式会社 色むら監視装置
WO2022115461A1 (en) * 2020-11-24 2022-06-02 Applied Materials, Inc. Optical device metrology systems and related methods
US11802791B2 (en) 2020-11-24 2023-10-31 Applied Materials, Inc. Optical device metrology systems and related methods
US11816893B1 (en) 2022-08-03 2023-11-14 Industrial Video Solutions Inc. Systems and methods for monitoring and controlling industrial processes
US11846930B1 (en) 2022-08-03 2023-12-19 Industrial Video Solutions Inc. Systems and methods for monitoring and controlling industrial processes
US20240044079A1 (en) * 2022-08-03 2024-02-08 Industrial Video Solutions Inc. Systems and methods for monitoring and controlling industrial processes
US11932991B2 (en) * 2022-08-03 2024-03-19 Industrial Video Solutions Inc. Systems and methods for monitoring and controlling industrial processes

Also Published As

Publication number Publication date
WO2000045156A1 (en) 2000-08-03
EP1155307A1 (en) 2001-11-21
FI990159A (sv) 2000-07-29
FI990159A0 (sv) 1999-01-28
AU2442900A (en) 2000-08-18
CA2359315A1 (en) 2000-08-03
US20050008765A1 (en) 2005-01-13

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Legal Events

Date Code Title Description
AS Assignment

Owner name: METSO PAPER AUTOMATION OY, FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KARJANMAA, JARI-MATTI;REEL/FRAME:012525/0401

Effective date: 20011023

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION