EP0922139A1 - Verfahren zur beseitigung von papierfehlern bei der kontinuierlichen papierherstellung - Google Patents
Verfahren zur beseitigung von papierfehlern bei der kontinuierlichen papierherstellungInfo
- Publication number
- EP0922139A1 EP0922139A1 EP97937503A EP97937503A EP0922139A1 EP 0922139 A1 EP0922139 A1 EP 0922139A1 EP 97937503 A EP97937503 A EP 97937503A EP 97937503 A EP97937503 A EP 97937503A EP 0922139 A1 EP0922139 A1 EP 0922139A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paper
- detector
- web
- speed
- station
- 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.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
-
- 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
Definitions
- the invention relates to a method for eliminating paper defects in continuous paper production.
- Continuously operating paper machines are made up of the stations headbox, wire section, press section, dryer section, drying smoothing unit and rewinder.
- the aqueous stock suspension is evenly distributed over the web width in order to ensure optimum sheet formation.
- the actual paper sheet is formed by a filtration process.
- the individual paper fibers are already fixed to their final position in a wet fleece.
- the excess water in the press section is then driven out of the paper fiber fleece by means of pressure.
- the paper web passes through a plurality of presses arranged one behind the other.
- the paper web is smoothed, for which purpose a smoothing unit composed of two rollers is generally used, which, in addition to smoothing, compresses the paper and at the same time influences the paper thickness. Finally, the paper web is wound up on a drum.
- Errors in the paper web can occur during the aforementioned production process. These can be holes or tears along the longitudinal edges of the paper web, as well as dark or light spots on the paper web. Furthermore, it can lead to unwanted pieces of fabric during manufacture, or folds in the running paper web. These errors usually disrupt the further transport of the paper web within the paper not pier machine. In contrast, in the downstream processing stations, for example in a subsequent coating machine or also in a printing press, the paper web may be torn or torn at the faulty locations. It is therefore necessary to eliminate such paper defects before the paper web enters a downstream processing stage.
- the invention is based on the object of providing a method with which the time losses caused by eliminating errors in the paper web during paper production can be reduced.
- the speed of the paper web between the detector and a station located downstream of the detector is recorded or calculated for the purpose of troubleshooting. This speed is used to calculate the point in time at which the web section having the paper error arrives in the troubleshooting station, the speed of the web section being reduced to a value which is reduced compared to the normal speed or even completely to zero before this arrival.
- the station then automatically removes the paper error by means of suitable devices at the point in time which was calculated on the basis of the speed of the paper web.
- the speed of the track section is then increased again to normal values.
- the detector can be set up not only to recognize and locate the paper defect, but also to determine its character, for example the type and contour of the paper defect and its localization with respect to the width of the paper web. All of this information can be used and evaluated within the system in order to set the speed of the track section within the station to the required value for troubleshooting. In this way, the time lost in paper production by eliminating faults in the paper web is reduced to the absolutely necessary minimum.
- the paper web passes through a further detector before it reaches the detector, and that the further detector carries out a preliminary or large detection of the paper error, whereas the detector for additional detection of the characteristic of the paper error, e.g. B. its type and contour is set up.
- the detector for additional detection of the characteristic of the paper error e.g. B. its type and contour is set up.
- the further detector must only be set up to detect errors at all and to locate them temporarily.
- the measurement characteristic of this detector is therefore aimed at a fast detection, less at a detailed detection. Rather, details are captured by the detector upstream of the station for troubleshooting. Such details are the type of paper defect, its contour and the location of the paper defect with respect to the width of the paper web.
- the time of arrival of the web section having the predetected paper defect at the detector is preferably calculated on the basis of the speed of the paper web on the way to the detector.
- the speed of the web section containing the paper error is reduced to a value which is lower than the normal speed before the web section arrives at the detector.
- the speed which has already been reduced can be reduced to a value which is again reduced in comparison to it or to zero immediately before the path section arrives in the station for troubleshooting.
- the removal of the paper defect is carried out by covering the area of the defect with a rapidly hardening fluid.
- the fluid can be applied by spraying on one or both sides onto the fault location.
- the fluid can be applied to the flaw by roller application.
- a fast-curing UV varnish is particularly suitable as the fluid.
- the process is suitable for both on-line paper production and off-line paper production.
- the station, detector and further detector are arranged along a continuous paper web, so that the automated removal of paper defects thus takes place at full paper web speed in the paper machine, while in the second case the further detector on a paper machine and station and detector along one of the paper machine downstream rewinders or pre-rollers are arranged.
- the rewinder or pre-winder represents the link between the paper machine and the coating machine.
- the drum 1 is shown on the right, on which the paper web wound at the end of the paper machine is located.
- This paper web can have paper defects at various points. The detection of this Paper errors already occur in the upstream paper machine, the location of the paper error with respect to the length of the paper web wound on the drum being stored internally in a control unit. After the drum 1 is clamped onto the pre-reel, the system already "knows" where there are defects within the length of the wound paper web. It is alternatively also possible to provide the drum 1 with a built-in memory element which contains the corresponding position data of the paper errors, e.g. B. an electronic chip arranged on the drum.
- the paper web is drawn off the drum 1 in the pre-roller and then guided over a first deflection roller 2 and a second deflection roller 3.
- the paper web itself is shown in the drawing with the reference number 4.
- a detector 5 which is constructed differently in terms of its detection characteristics than the further detector integrated in the upstream paper machine. While the further detector is only set up to detect paper defects even at high web speeds and at least roughly localize them with respect to the length of the web, the detector 5 attached to the pre-roller is set up to recognize the already predetected paper defects with regard to their exact character and the size and extent of the To locate paper error. Furthermore, sensitization to further properties of the paper defect can be provided, e.g. B. the detection of light / dark shades or warps and folds. On the basis of the measured values of the detector 5, a decision is then made within the system to what extent and in what way an error is rectified.
- the further detector is only set up to detect paper defects even at high web speeds and at least roughly localize them with respect to the length of the web
- the detector 5 attached to the pre-roller is set up to recognize the already predetected paper defects with regard to their exact character and the size and extent of the To locate paper error. Furthermore, sensitization to
- the speed of the web section containing the paper error can be reduced to a value which is lower than the normal speed before this web section arrives at the detector 5. This has the advantage that the detector 5 already detects the arrival and the approximate localization of error signals is prepared, and can use the detailed recording of the error without delay.
- the time of arrival of the web section having the predetected paper error at the detector 5 can, provided the paper web arrives from the paper machine directly and without interruption, also be calculated on the basis of the speed of the paper web on the way from the further detector to the detector 5.
- the paper error is eliminated in a station 6 which, in the exemplary embodiment, is located between the deflection roller 2 and the deflection roller 3.
- a spray head 7 aligned with the paper web 4, via which a fast-curing UV varnish is sprayed onto the flaw.
- the fluid can also be applied via rollers.
- the order can, as shown in the drawing, be one-sided or both-sided.
- a quick-curing UV varnish it is also possible to use a suitable plastic adhesive. It is crucial that the fluid by itself has the property of covering the area of the defect in a flat and film-forming manner, and in this way protecting the paper in the area of the paper defect during further processing, for example in a coating machine or in a printing press.
- the agent used should be used in the process of dissolving paper, e.g. B. in committee processing or waste paper recycling can easily be separated from the paper.
- the application of the fluid in station 6 takes place automatically, ie without human intervention.
- the exact time must be known at which the web section with the paper defect arrives in the working area of the spray head 7.
- the decisive factor here is the speed at which the paper web and thus also the defective web section moves from the detectors to the spray head 7. Therefore, the speed of the paper web between the detector 5 and the station 6 spatially downstream of the detector 5 is detected or calculated, and the exact time of the arrival of the web section having the paper defect in the station 6 is calculated on the basis of the determined speed.
- the spray head 7 does not work in all cases over the entire width of the paper web, but only in the region detected as defective with regard to the longitudinal direction of the web and the width of the web.
- the spray head 7 is therefore advantageously composed of a large number of individual spray nozzles, which are arranged across the width of the paper web and can be controlled individually.
- the speed of the paper web is reduced to a value which is reduced from normal speed or to zero. After the station 6 has passed and the drying process can be considered complete, the speed of the paper web is raised again to the normal value.
- the drawing shows the method for an application off line, i. H. the further detector is already in the paper machine and the station 6 and the detector 5 are arranged in the preliminary roller.
- an on-line method application is also possible, with the station, detector and further detector being located along a continuous paper web, for example in a combined paper and coating machine.
- the detectors work optically across the entire width of the paper web. Infrared photo detectors or CCD line cameras can be used.
Landscapes
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
- Paper (AREA)
- Making Paper Articles (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI9730264T SI0922139T1 (en) | 1996-08-15 | 1997-07-18 | Process for elimination of paper defects in continuous paper production |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19632988A DE19632988C1 (de) | 1996-08-15 | 1996-08-15 | Verfahren zur Beseitigung von Papierfehlern bei der kontinuierlichen Papierherstellung |
DE19632988 | 1996-08-15 | ||
PCT/EP1997/003859 WO1998006897A1 (de) | 1996-08-15 | 1997-07-18 | Verfahren zur beseitigung von papierfehlern bei der kontinuierlichen papierherstellung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0922139A1 true EP0922139A1 (de) | 1999-06-16 |
EP0922139B1 EP0922139B1 (de) | 2001-12-12 |
Family
ID=7802762
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97937503A Expired - Lifetime EP0922139B1 (de) | 1996-08-15 | 1997-07-18 | Verfahren zur beseitigung von papierfehlern bei der kontinuierlichen papierherstellung |
Country Status (16)
Country | Link |
---|---|
EP (1) | EP0922139B1 (de) |
JP (1) | JP2001502648A (de) |
KR (1) | KR20000029927A (de) |
CN (1) | CN1104526C (de) |
AT (1) | ATE210762T1 (de) |
BR (1) | BR9714336A (de) |
CA (1) | CA2263211C (de) |
CZ (1) | CZ297849B6 (de) |
DE (2) | DE19632988C1 (de) |
ES (1) | ES2165084T3 (de) |
ID (1) | ID17869A (de) |
NO (1) | NO313558B1 (de) |
PL (1) | PL184169B1 (de) |
PT (1) | PT922139E (de) |
RU (1) | RU2166017C2 (de) |
WO (1) | WO1998006897A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112007002021T5 (de) | 2006-09-06 | 2009-08-13 | Metso Paper, Inc. | Verfahren und Vorrichtung zum Ausbessern einer Faserbahn |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI990159A (fi) * | 1999-01-28 | 2000-07-29 | Valmet Automation Inc | Menetelmä kuiturainan laadun valvomiseksi |
DE10011067A1 (de) * | 2000-03-07 | 2001-09-13 | Voith Paper Patent Gmbh | Verfahren zur Herstellung und Weiterverarbeitung von Papier |
US20020176617A1 (en) * | 2001-05-22 | 2002-11-28 | Pti Advanced Filtration, Inc. | System and method for continuous integrity testing of a material web |
DE102005053037A1 (de) * | 2005-11-04 | 2007-05-10 | Maschinenfabrik Rieter Ag | Verfahren zur Erfassung von Schmutz in einem bewegten Faserstrang |
FI118924B (fi) | 2005-12-05 | 2008-05-15 | Metso Paper Inc | Laitteisto ja menetelmä katkenneen massaradan poistamiseksi sellukuivaimesta |
DE102006047487A1 (de) * | 2006-10-05 | 2008-04-10 | Voith Patent Gmbh | Trocknungsanordnung |
WO2009042638A2 (en) * | 2007-09-27 | 2009-04-02 | Abb Ltd. | Accurate tracking of web features through converting processes |
FI121859B (fi) * | 2008-11-25 | 2011-05-13 | Metso Automation Oy | Menetelmä rainan paikkauksen ohjaamiseksi välirullaimella vastaava järjestelmä |
US9053413B2 (en) | 2013-07-22 | 2015-06-09 | Xerox Corporation | Automatically identifying locations of printing defects within printed rolls |
CN104326125B (zh) * | 2014-08-28 | 2016-08-24 | 北京凌云光技术有限责任公司 | 瑕疵标签跟踪方法及装置 |
CN104326301B (zh) * | 2014-08-28 | 2017-02-08 | 北京凌云光技术有限责任公司 | 瑕疵标签自动剔除装置及使用自动剔除装置的系统 |
CN104637156B (zh) | 2015-03-06 | 2017-05-24 | 广州广电运通金融电子股份有限公司 | 纸币转出控制方法、装置以及纸币存储设备 |
CN105500919B (zh) * | 2015-12-30 | 2017-11-10 | 凌云光技术集团有限责任公司 | 一种标签缺陷报警方法及装置 |
IT201600127586A1 (it) * | 2016-12-16 | 2018-06-16 | Futura Spa | Impianto per la produzione di logs di materiale cartaceo. |
CN109366568A (zh) * | 2018-11-30 | 2019-02-22 | 广州市普理司科技有限公司 | 多功能自动品检机以及其控制方法 |
CN111879781B (zh) * | 2020-06-17 | 2022-02-11 | 西安交通大学 | 一种基于机器视觉的试纸质量检测系统 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62295862A (ja) * | 1986-06-13 | 1987-12-23 | Toshiba Corp | 巻取機のシ−ト補修制御装置 |
FR2670896B1 (fr) * | 1990-12-24 | 1994-08-12 | Siderurgie Fse Inst Rech | Dispositif de detection de defauts d'une bande en cours de defilement. |
JP2848028B2 (ja) * | 1991-05-29 | 1999-01-20 | 王子製紙株式会社 | ウエブの補修方法及び補修装置 |
-
1996
- 1996-08-15 DE DE19632988A patent/DE19632988C1/de not_active Expired - Fee Related
-
1997
- 1997-07-18 DE DE59705791T patent/DE59705791D1/de not_active Expired - Fee Related
- 1997-07-18 WO PCT/EP1997/003859 patent/WO1998006897A1/de active IP Right Grant
- 1997-07-18 CN CN97197256A patent/CN1104526C/zh not_active Expired - Fee Related
- 1997-07-18 PT PT97937503T patent/PT922139E/pt unknown
- 1997-07-18 ES ES97937503T patent/ES2165084T3/es not_active Expired - Lifetime
- 1997-07-18 JP JP10509323A patent/JP2001502648A/ja active Pending
- 1997-07-18 BR BR9714336-7A patent/BR9714336A/pt not_active IP Right Cessation
- 1997-07-18 KR KR1019997001143A patent/KR20000029927A/ko not_active Application Discontinuation
- 1997-07-18 CA CA002263211A patent/CA2263211C/en not_active Expired - Fee Related
- 1997-07-18 AT AT97937503T patent/ATE210762T1/de not_active IP Right Cessation
- 1997-07-18 CZ CZ0048899A patent/CZ297849B6/cs not_active IP Right Cessation
- 1997-07-18 EP EP97937503A patent/EP0922139B1/de not_active Expired - Lifetime
- 1997-07-18 RU RU99105120/12A patent/RU2166017C2/ru not_active IP Right Cessation
- 1997-08-14 ID IDP972852A patent/ID17869A/id unknown
-
1999
- 1999-02-09 NO NO19990605A patent/NO313558B1/no not_active IP Right Cessation
- 1999-02-12 PL PL97331586A patent/PL184169B1/pl not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9806897A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112007002021T5 (de) | 2006-09-06 | 2009-08-13 | Metso Paper, Inc. | Verfahren und Vorrichtung zum Ausbessern einer Faserbahn |
Also Published As
Publication number | Publication date |
---|---|
CA2263211A1 (en) | 1998-02-19 |
PT922139E (pt) | 2002-04-29 |
NO990605L (no) | 1999-02-09 |
NO313558B1 (no) | 2002-10-21 |
ATE210762T1 (de) | 2001-12-15 |
DE19632988C1 (de) | 1998-01-22 |
NO990605D0 (no) | 1999-02-09 |
BR9714336A (pt) | 2000-04-11 |
PL184169B1 (pl) | 2002-09-30 |
JP2001502648A (ja) | 2001-02-27 |
ES2165084T3 (es) | 2002-03-01 |
WO1998006897A1 (de) | 1998-02-19 |
CZ48899A3 (cs) | 1999-07-14 |
CN1104526C (zh) | 2003-04-02 |
RU2166017C2 (ru) | 2001-04-27 |
ID17869A (id) | 1998-02-05 |
EP0922139B1 (de) | 2001-12-12 |
PL331586A1 (en) | 1999-07-19 |
KR20000029927A (ko) | 2000-05-25 |
CA2263211C (en) | 2006-04-18 |
CZ297849B6 (cs) | 2007-04-11 |
CN1228132A (zh) | 1999-09-08 |
DE59705791D1 (de) | 2002-01-24 |
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