CA2263211C - Process for elimination of paper defects in continuous paper production - Google Patents
Process for elimination of paper defects in continuous paper production Download PDFInfo
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- CA2263211C CA2263211C CA002263211A CA2263211A CA2263211C CA 2263211 C CA2263211 C CA 2263211C CA 002263211 A CA002263211 A CA 002263211A CA 2263211 A CA2263211 A CA 2263211A CA 2263211 C CA2263211 C CA 2263211C
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- paper
- defect
- web
- sensor
- elimination
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- 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
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- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
- Paper (AREA)
- Making Paper Articles (AREA)
Abstract
A process for elimination of paper defects during continuous paper productio n which reduces time lost due to defect correction has the following steps: a) recognition and localization of the paper defect by means of sensors (5) directed at the running paper web (4); b) detection or calculation of the speed of the paper web (4) between the sensor (5) and a station (6) for defect correction positioned downstream from the sensor (5); c) on the basis of the speed of the paper we b, calculation of the arrival time of the web segment with the paper defect at the station (6) for defect correction; d) before arrival of the web segment with the paper defect at the station (6) for defect correction, reduction of the web segment speed to a lower value than normal speed or to zero, e) automatic removal of the paper defect in station (6) for defect correction and f) restoring the web section to normal speed.
Description
~l.~.itWPTEiy~.3 WO~=98/06897 PCT/EP97/03859 Process for Elimination of Paper Defects in Continuous Paper Production The present invention relates to a process for elimination of paper defects in continuous paper production.
Paper machinery that operates continuously comprises a material intake section, a screen section, a press section, a drying section, dry-smoothing machinery, and winding machinery. The aqueous suspension of the material is distributed evenly_across (U the width of the web in the material intake section, primarily to ensure optimal sheet formation. In the following screen section, the actual sheet of paper is formed by a filtration process. The individual paper fibres are fixed in their ultimate position in a wet random-fibre web. Then, the excess water is expelled from the random fibre paper web by pressure that is applied in the press section. To this end, the paper web moves through a plurality of presses that are arranged one after the other. After drying, which follows this, the paper web is smoothed, to which end smoothing machinery that comprise--as a rule-- two rollers is used and these, in addition to the smoothing, act to compress the paper and thus exert a simultaneous influence on the thickness of the paper. Finally, the web of paper is wound up onto a drum.
Defects may be formed in the web of paper during the above-described production process. These defects can be in the form of holes or splits along the long edge of the paper web, and they may also be in the form of dark or light patches on the paper web. In addition, undesirable lumps may be formed during production, there may be creases in the running paper web. As a rule, such defects do not disrupt the further movement of the paper web through the paper machinery. In contrast to this, in the processing stations that follow, such as in subsequent coating machinery, splitting or tearing may occur in the defective places. For this reason,_it is essential_to eliminate defects of this kind in the paper, even before the paper web passes into the subsequent processing stage.
Up to now, defects in the paper web have been eliminated manually by marking the paper web that has been monitored for defects by means of sensors at the places where the defects are located and then, in a subsequent station, slowing the paper web down as the section of the paper web that has been so marked approaches, so that as the web creeps past, an operator can attach a sticker to the defective area. Depending on the type of defect, the whole of the defective section of the paper web can be eliminated by the operator and an adhesive patch can be applied across the whole width of the paper web. This type of defect elimination is time consuming, since the speed of the paper roll and thus of the whole paper web has to be reduced to creep speed or even to a standstill in order that the defective _2_ area can be eliminated. However, not even this time-consuming and thus costly elimination is enough to prevent paper defects from causing rips and tears in subsequent processing stages.
It is the objective of the present invention to create a process by which the lost time that is caused by the elimination of defects in the paper web during paper production can be reduced.
In order to achieve this objective , the invention provides a process for automated elimination of paper defects during paper production in a paper machine, comprising the following steps: a) identification, localization, and recording of a paper defect by means of a first sensor that is directed onto a running paper web; b) recording or calculating the speed of the paper web between the sensor and a defect-elimination station located downstream of the sensor; c) calculating the time when the web section that contains the paper defect will arrive in the defect-elimination station on the basis of the speed of the paper web; d) automatically eliminating the paper defect in the defect-elimination station; characterized in that the first sensor and the defect-elimination station are arranged spaced along the continuous paper web; and in that elimination of the paper defect is effected at full paper web speed during continuous paper production.
According to the present invention, the identification and localization of the paper defect is carried out solely by conventional means, namely, suitable sensors, the recording elements of which are directed towards the running paper web.
In contrast to the previously used means, the speed of the paper web is recorded or calculated between the sensor and a subsequent defect-elimination station that follows the sensor.
This speed is used to calculate the time when the web section that contains the paper defect will enter the defect-elimination station, when prior to its arrival, the speed of the web section is reduced to a value that is less than the value for the normal speed, or even to zero. Then, at the time that has been calculated on the basis of the speed of the paper web, the elimination of the paper defect is effected automatically by appropriate devices. Subsequently, the speed of the web section is increased to its normal value.
In contrast to known, manual defect elimination, it is not necessary to slow down the speed of the paper web care-fully and by hand to the reduced speed that is necessary for defect elimination. Rather, on the basis of the information obtained by analysis of the detection signals, the system decides on the speed with which the web section must move into the following defect-elimination station in order that the paper defect can be eliminated reliably. To this end, the sensor can be so designed to identify and localize not only the paper defect but also its character, e.g., the type and shape of the paper defect, and to localize it relative to the width of the paper web. All of this information can be used internally by the system, and analysed in order to set the speed of the web section within the defect elimination station to the required value. In this way, the time that is lost by eliminating defects in the paper web during paper production is reduced to the absolute minimum.
Zn one configuration of the process it is proposed that the IS paper web pass through an additional sensor before it reaches the sensor, and that the additional sensor completes a pre-determination or an approximate determination of the paper defect, whereas the sensor is designed to identify the character of the paper defect, e.g., its type and shape. In this way it ~is possible to run the paper web and thus the paper machine at very high speed during normal operation, since the additional sensor need only be designed so as to identify and localize defects exclusively, in advance. Thus, the measurement characteristics of this sensor are designed for rapid recording rather than for detailed recording. Details are recorded by the sensor that precedes the defect-elimination station. Such details are the type of paper defect, its shape, and the position of the paper defect relative to the width of the paper web.
It is preferred that the time that the pre-detected web section that contains the paper defect will arrive at the sensor be calculated on the basis of the speed of the paper °,aeb on the path to the sensor.
In a further configuration of the process, it is proposed I~ that the speed of the web section that contains the paper error be reduced to a value that is lower than the value for the normal speed even prior to the arrival of the web section at the sensor.
In addition, the speed that has already been reduced can be further reduced to an even lower value, or even to zero, prior to the arrival of the web section in the defect-elimination station.
The present invention also proposes that the paper defect be eliminated by covering the defective area with a quick-hardening fluid so as to form a flat covering. According to a first variant, the fluid can be applied by being sprayed onto the, defective area on one or both sides. According to a second variant, the fluid can be applied to the defective area by rollers.
A quick-hardening ultraviolet lacquer is suitable as fluid.
c WO'98/06897 PCT/EP97/03859 The process is suitable for use within the framework of on-line paper production and also within the framework of off-line paper production. In the first case, station, sensor, and additional sensor are arranged along the continuous paper web, so that the automated elimination of paper defects takes place in the paper machine at full paper web speed, whereas in the second case, the additional sensor is arranged on a paper machine, and station and sensor are arranged along a take-up roll or pre-roller that precedes the station and the sensor. The take-up roll or the pre-roller forms the connecting element between the paper machine and the coating machine.
Add-itional details and advantages of the present invention are explained in greater detail below on the basis of an embodiment. In this connection, reference is made to the appended drawing, which shows a side view of a pre-roller that is arranged in the production process between the paper machine and the coating machine.
On the right-hand side, the drawing shows the drum 1 on which the end of the paper web that is wound on at the end of tie paper machine is located. This paper web can have paper defects at various places. The detection of these paper defects is effected in the previous paper machine, and the localization of the paper defect relative to the length of the paper web that has been wound on to the drum is stored internally in a control unit.
_7_ W0~98/06897 PCT/EP97/03859 Once the drum 1 has been installed on the pre-roller, the system "knows" where the errors are located within the length of the paper web that has been wound on. As an alternative, it is also possible to provide the drum 1 with a built-in memory e.g., an electronic chip that is arranged on the drum, that contains the appropriate position data with respect to the paper defects.
In the pre-roller, the paper web is drawn off the drum 1 and then passes over a first guide roller 2 and a second guide roller 3. In the drawing, the paper web itself is numbered 4. -lU Between the drum 1 and the guide roller 2 there is a sensor 5, the recording characteristics of which are different to those of the additional sensor that is integrated in the preceding paper machine. Whereas the additional sensor is designed simply . to record paper defects at a high web speed and localize these, at least approximately, the sensor 5 that is secured to the pre-rollerer is designed to identify the paper defect that has already been detected with respect to its precise character, and to localize the size and extent of the paper defect. In addition, it is possible to provide a degree of sensitivity with respect to additional characteristics of the paper defect, e.g., the identification of light/dark shading or of blisters and creases.
Then, based of the measured values obtain from the sensor 5, the system reaches a decision with respect to the scope of defect elimination and the manner in which this is to be done.
_g_ WO'98/06897 PCT/EP97/03859 Since the approximate locality of the paper defect is already known on the basis of the measurement results obtained from the additional sensor, the speed of the paper web section that contains the paper error can be reduced to a value that is less than the normal speed even before this web section arrives at the sensor 5. This entails the advantage that the sensor 5 has been prepared for the arrival and the approximate localization by error signals, and can use the detailed identification of the defect without any delay. _ -The paper defect is eliminated in a station 6 that in the embodiment that is shown is located between the guide roller 2 and the guide roller 3. At this location, there is a spray head 7 that is directed onto the paper web 4, through which a quick-hardening ultraviolet lacquer is sprayed onto the defective area.
Alternatively, the fluid can be applied by rollers. As is shown in the drawing, application can be made on one side or on both sides. As an alternative to a quick-hardening ultraviolet lacquer, it is also possible to use a suitable plastic adhesive.
What is important is that the fluid itself can cover the defective area in a manner that is flat and forms a film, and in this way protect the paper in the area of the paper defects during further processing, as in a coating machine or a printing machine. It is important that the agent that is used be easy to WO'98/06897 PCT/EP97/03859 separate from the paper during the processes that are used to process waste paper or recycle it.
The fluid is applied automatically in the station 6, i.e., without any human intervention. To this end, the precise time at which the web section with the paper defect reaches the working area of these spray head 7 must be known. Critical in this respect is the speed with which the paper web and thus the defective web section moves from the sensor to the spray head 7.
For this.reason, the speed of the paper web between the sensor 5 and the station 6 that follows the sensor 5 must be recorded or calculated, and the exact time of arrival of the web section that contains the paper defect in the station 6 must be calculated on the basis of the speed that has been determined. The results of the measurements completed by the sensor 5 are also taken into IS account in the control system of the spray head 7, which is to say that the spray head 7 does not work across the whole width of the paper web in every case, but rather only in the area that has been identified as being defective within the longitudinal direction and the width of the web. More advantageously, the -spray head 7 comprises a plurality of spray nozzles that are arranged across the width of the paper web and can be controlled individually.
Before the web section that has the paper defects arrives in the station 6, the speed of the paper web is reduced to a value -IO-~0~98/06897 PCT/EP97/03859 that is less than the value for the normal speed, or to zero.
Once the station 6 has been passed and the drying process has been completed, the speed of the paper web is restored to its normal value.
The drawing shows the process as it is used off line, i.e., the additional sensor is located in the paper machine and the station 6 together with the sensor 5 are arranged in the pre-roller. However, the process can also used on line, when the station, sensor, and additional sensor are arranged along a continuous paper web, as in a combined paper and coating machine.
The sensors operate optically across the whole width of the paper web. Infra-red photosensors or CCD line cameras can be used as such sensors.
~Pference numbers used in the drawing 1 Drum 2 Guide roller 3 Guide roller 4 Paper web Sensor 6 Station 7 Spray head
Paper machinery that operates continuously comprises a material intake section, a screen section, a press section, a drying section, dry-smoothing machinery, and winding machinery. The aqueous suspension of the material is distributed evenly_across (U the width of the web in the material intake section, primarily to ensure optimal sheet formation. In the following screen section, the actual sheet of paper is formed by a filtration process. The individual paper fibres are fixed in their ultimate position in a wet random-fibre web. Then, the excess water is expelled from the random fibre paper web by pressure that is applied in the press section. To this end, the paper web moves through a plurality of presses that are arranged one after the other. After drying, which follows this, the paper web is smoothed, to which end smoothing machinery that comprise--as a rule-- two rollers is used and these, in addition to the smoothing, act to compress the paper and thus exert a simultaneous influence on the thickness of the paper. Finally, the web of paper is wound up onto a drum.
Defects may be formed in the web of paper during the above-described production process. These defects can be in the form of holes or splits along the long edge of the paper web, and they may also be in the form of dark or light patches on the paper web. In addition, undesirable lumps may be formed during production, there may be creases in the running paper web. As a rule, such defects do not disrupt the further movement of the paper web through the paper machinery. In contrast to this, in the processing stations that follow, such as in subsequent coating machinery, splitting or tearing may occur in the defective places. For this reason,_it is essential_to eliminate defects of this kind in the paper, even before the paper web passes into the subsequent processing stage.
Up to now, defects in the paper web have been eliminated manually by marking the paper web that has been monitored for defects by means of sensors at the places where the defects are located and then, in a subsequent station, slowing the paper web down as the section of the paper web that has been so marked approaches, so that as the web creeps past, an operator can attach a sticker to the defective area. Depending on the type of defect, the whole of the defective section of the paper web can be eliminated by the operator and an adhesive patch can be applied across the whole width of the paper web. This type of defect elimination is time consuming, since the speed of the paper roll and thus of the whole paper web has to be reduced to creep speed or even to a standstill in order that the defective _2_ area can be eliminated. However, not even this time-consuming and thus costly elimination is enough to prevent paper defects from causing rips and tears in subsequent processing stages.
It is the objective of the present invention to create a process by which the lost time that is caused by the elimination of defects in the paper web during paper production can be reduced.
In order to achieve this objective , the invention provides a process for automated elimination of paper defects during paper production in a paper machine, comprising the following steps: a) identification, localization, and recording of a paper defect by means of a first sensor that is directed onto a running paper web; b) recording or calculating the speed of the paper web between the sensor and a defect-elimination station located downstream of the sensor; c) calculating the time when the web section that contains the paper defect will arrive in the defect-elimination station on the basis of the speed of the paper web; d) automatically eliminating the paper defect in the defect-elimination station; characterized in that the first sensor and the defect-elimination station are arranged spaced along the continuous paper web; and in that elimination of the paper defect is effected at full paper web speed during continuous paper production.
According to the present invention, the identification and localization of the paper defect is carried out solely by conventional means, namely, suitable sensors, the recording elements of which are directed towards the running paper web.
In contrast to the previously used means, the speed of the paper web is recorded or calculated between the sensor and a subsequent defect-elimination station that follows the sensor.
This speed is used to calculate the time when the web section that contains the paper defect will enter the defect-elimination station, when prior to its arrival, the speed of the web section is reduced to a value that is less than the value for the normal speed, or even to zero. Then, at the time that has been calculated on the basis of the speed of the paper web, the elimination of the paper defect is effected automatically by appropriate devices. Subsequently, the speed of the web section is increased to its normal value.
In contrast to known, manual defect elimination, it is not necessary to slow down the speed of the paper web care-fully and by hand to the reduced speed that is necessary for defect elimination. Rather, on the basis of the information obtained by analysis of the detection signals, the system decides on the speed with which the web section must move into the following defect-elimination station in order that the paper defect can be eliminated reliably. To this end, the sensor can be so designed to identify and localize not only the paper defect but also its character, e.g., the type and shape of the paper defect, and to localize it relative to the width of the paper web. All of this information can be used internally by the system, and analysed in order to set the speed of the web section within the defect elimination station to the required value. In this way, the time that is lost by eliminating defects in the paper web during paper production is reduced to the absolute minimum.
Zn one configuration of the process it is proposed that the IS paper web pass through an additional sensor before it reaches the sensor, and that the additional sensor completes a pre-determination or an approximate determination of the paper defect, whereas the sensor is designed to identify the character of the paper defect, e.g., its type and shape. In this way it ~is possible to run the paper web and thus the paper machine at very high speed during normal operation, since the additional sensor need only be designed so as to identify and localize defects exclusively, in advance. Thus, the measurement characteristics of this sensor are designed for rapid recording rather than for detailed recording. Details are recorded by the sensor that precedes the defect-elimination station. Such details are the type of paper defect, its shape, and the position of the paper defect relative to the width of the paper web.
It is preferred that the time that the pre-detected web section that contains the paper defect will arrive at the sensor be calculated on the basis of the speed of the paper °,aeb on the path to the sensor.
In a further configuration of the process, it is proposed I~ that the speed of the web section that contains the paper error be reduced to a value that is lower than the value for the normal speed even prior to the arrival of the web section at the sensor.
In addition, the speed that has already been reduced can be further reduced to an even lower value, or even to zero, prior to the arrival of the web section in the defect-elimination station.
The present invention also proposes that the paper defect be eliminated by covering the defective area with a quick-hardening fluid so as to form a flat covering. According to a first variant, the fluid can be applied by being sprayed onto the, defective area on one or both sides. According to a second variant, the fluid can be applied to the defective area by rollers.
A quick-hardening ultraviolet lacquer is suitable as fluid.
c WO'98/06897 PCT/EP97/03859 The process is suitable for use within the framework of on-line paper production and also within the framework of off-line paper production. In the first case, station, sensor, and additional sensor are arranged along the continuous paper web, so that the automated elimination of paper defects takes place in the paper machine at full paper web speed, whereas in the second case, the additional sensor is arranged on a paper machine, and station and sensor are arranged along a take-up roll or pre-roller that precedes the station and the sensor. The take-up roll or the pre-roller forms the connecting element between the paper machine and the coating machine.
Add-itional details and advantages of the present invention are explained in greater detail below on the basis of an embodiment. In this connection, reference is made to the appended drawing, which shows a side view of a pre-roller that is arranged in the production process between the paper machine and the coating machine.
On the right-hand side, the drawing shows the drum 1 on which the end of the paper web that is wound on at the end of tie paper machine is located. This paper web can have paper defects at various places. The detection of these paper defects is effected in the previous paper machine, and the localization of the paper defect relative to the length of the paper web that has been wound on to the drum is stored internally in a control unit.
_7_ W0~98/06897 PCT/EP97/03859 Once the drum 1 has been installed on the pre-roller, the system "knows" where the errors are located within the length of the paper web that has been wound on. As an alternative, it is also possible to provide the drum 1 with a built-in memory e.g., an electronic chip that is arranged on the drum, that contains the appropriate position data with respect to the paper defects.
In the pre-roller, the paper web is drawn off the drum 1 and then passes over a first guide roller 2 and a second guide roller 3. In the drawing, the paper web itself is numbered 4. -lU Between the drum 1 and the guide roller 2 there is a sensor 5, the recording characteristics of which are different to those of the additional sensor that is integrated in the preceding paper machine. Whereas the additional sensor is designed simply . to record paper defects at a high web speed and localize these, at least approximately, the sensor 5 that is secured to the pre-rollerer is designed to identify the paper defect that has already been detected with respect to its precise character, and to localize the size and extent of the paper defect. In addition, it is possible to provide a degree of sensitivity with respect to additional characteristics of the paper defect, e.g., the identification of light/dark shading or of blisters and creases.
Then, based of the measured values obtain from the sensor 5, the system reaches a decision with respect to the scope of defect elimination and the manner in which this is to be done.
_g_ WO'98/06897 PCT/EP97/03859 Since the approximate locality of the paper defect is already known on the basis of the measurement results obtained from the additional sensor, the speed of the paper web section that contains the paper error can be reduced to a value that is less than the normal speed even before this web section arrives at the sensor 5. This entails the advantage that the sensor 5 has been prepared for the arrival and the approximate localization by error signals, and can use the detailed identification of the defect without any delay. _ -The paper defect is eliminated in a station 6 that in the embodiment that is shown is located between the guide roller 2 and the guide roller 3. At this location, there is a spray head 7 that is directed onto the paper web 4, through which a quick-hardening ultraviolet lacquer is sprayed onto the defective area.
Alternatively, the fluid can be applied by rollers. As is shown in the drawing, application can be made on one side or on both sides. As an alternative to a quick-hardening ultraviolet lacquer, it is also possible to use a suitable plastic adhesive.
What is important is that the fluid itself can cover the defective area in a manner that is flat and forms a film, and in this way protect the paper in the area of the paper defects during further processing, as in a coating machine or a printing machine. It is important that the agent that is used be easy to WO'98/06897 PCT/EP97/03859 separate from the paper during the processes that are used to process waste paper or recycle it.
The fluid is applied automatically in the station 6, i.e., without any human intervention. To this end, the precise time at which the web section with the paper defect reaches the working area of these spray head 7 must be known. Critical in this respect is the speed with which the paper web and thus the defective web section moves from the sensor to the spray head 7.
For this.reason, the speed of the paper web between the sensor 5 and the station 6 that follows the sensor 5 must be recorded or calculated, and the exact time of arrival of the web section that contains the paper defect in the station 6 must be calculated on the basis of the speed that has been determined. The results of the measurements completed by the sensor 5 are also taken into IS account in the control system of the spray head 7, which is to say that the spray head 7 does not work across the whole width of the paper web in every case, but rather only in the area that has been identified as being defective within the longitudinal direction and the width of the web. More advantageously, the -spray head 7 comprises a plurality of spray nozzles that are arranged across the width of the paper web and can be controlled individually.
Before the web section that has the paper defects arrives in the station 6, the speed of the paper web is reduced to a value -IO-~0~98/06897 PCT/EP97/03859 that is less than the value for the normal speed, or to zero.
Once the station 6 has been passed and the drying process has been completed, the speed of the paper web is restored to its normal value.
The drawing shows the process as it is used off line, i.e., the additional sensor is located in the paper machine and the station 6 together with the sensor 5 are arranged in the pre-roller. However, the process can also used on line, when the station, sensor, and additional sensor are arranged along a continuous paper web, as in a combined paper and coating machine.
The sensors operate optically across the whole width of the paper web. Infra-red photosensors or CCD line cameras can be used as such sensors.
~Pference numbers used in the drawing 1 Drum 2 Guide roller 3 Guide roller 4 Paper web Sensor 6 Station 7 Spray head
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Process for automated elimination of paper defects during paper production in a paper machine, comprising the following steps:
a) identification, localization, and recording of a paper defect by means of a first sensor that is directed onto a running paper web;
b) recording or calculating the speed of the paper web between the sensor and a defect-elimination station located downstream of the sensor;
c) calculating the time when the web section that contains the paper defect will arrive in the defect-elimination station on the basis of the speed of the paper web;
d) automatically eliminating the paper defect in the defect-elimination station;
characterized in that the first sensor and the defect-elimination station are arranged spaced along the continuous paper web; and in that elimination of the paper defect is effected at full paper web speed during continuous paper production.
a) identification, localization, and recording of a paper defect by means of a first sensor that is directed onto a running paper web;
b) recording or calculating the speed of the paper web between the sensor and a defect-elimination station located downstream of the sensor;
c) calculating the time when the web section that contains the paper defect will arrive in the defect-elimination station on the basis of the speed of the paper web;
d) automatically eliminating the paper defect in the defect-elimination station;
characterized in that the first sensor and the defect-elimination station are arranged spaced along the continuous paper web; and in that elimination of the paper defect is effected at full paper web speed during continuous paper production.
2. Process as claimed in claim 1, characterized in that a second sensor is provided ahead of said first sensor to provide for pre-determination and approximate determination of paper defects.
3. Process as claimed in claim 1 or claim 2, character-ized in that the time of arrival of the web section that contains the pre-detected paper defect at the first sensor is calculated on the basis of the speed of the paper web on the path to the first sensor.
4. Process as claimed in one of claims 1 to 3, character-ized in that the elimination of the paper defect is effected by flat coverage of the defective area with a quick-hardening fluid.
5. Process as claimed in claim 4, characterized in that the fluid is sprayed onto the defective area on one or both sides.
6. Process as claimed in claim 4, characterized in that the fluid is applied to the defective area by rollers.
7. Process as claimed in claim 4, claim 5 or claim 6, characterized by use of a quick-hardening ultraviolet lacquer as fluid.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19632988.4 | 1996-08-15 | ||
| DE19632988A DE19632988C1 (en) | 1996-08-15 | 1996-08-15 | Process for eliminating paper defects in continuous paper production |
| PCT/EP1997/003859 WO1998006897A1 (en) | 1996-08-15 | 1997-07-18 | Process for elimination of paper defects in continuous paper production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2263211A1 CA2263211A1 (en) | 1998-02-19 |
| CA2263211C true CA2263211C (en) | 2006-04-18 |
Family
ID=7802762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002263211A Expired - Fee Related CA2263211C (en) | 1996-08-15 | 1997-07-18 | Process for elimination of paper defects in continuous paper production |
Country Status (16)
| Country | Link |
|---|---|
| EP (1) | EP0922139B1 (en) |
| JP (1) | JP2001502648A (en) |
| KR (1) | KR20000029927A (en) |
| CN (1) | CN1104526C (en) |
| AT (1) | ATE210762T1 (en) |
| BR (1) | BR9714336A (en) |
| CA (1) | CA2263211C (en) |
| CZ (1) | CZ297849B6 (en) |
| DE (2) | DE19632988C1 (en) |
| ES (1) | ES2165084T3 (en) |
| ID (1) | ID17869A (en) |
| NO (1) | NO313558B1 (en) |
| PL (1) | PL184169B1 (en) |
| PT (1) | PT922139E (en) |
| RU (1) | RU2166017C2 (en) |
| WO (1) | WO1998006897A1 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI990159A (en) * | 1999-01-28 | 2000-07-29 | Valmet Automation Inc | Procedure for monitoring the quality of a fiber web |
| DE10011067A1 (en) * | 2000-03-07 | 2001-09-13 | Voith Paper Patent Gmbh | During paper web production a system measures and monitors the shrinkage and other characteristics with data to be used by customers to set their processes easily and with reduced wastage |
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| FI118924B (en) | 2005-12-05 | 2008-05-15 | Metso Paper Inc | Apparatus and method for removing a broken pulp web from a cell dryer |
| FI119981B (en) * | 2006-09-06 | 2009-05-29 | Metso Paper Inc | Method and apparatus for patching fibrous material |
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| US8060234B2 (en) * | 2007-09-27 | 2011-11-15 | Abb Oy | Accurate tracking of web features through converting processes |
| FI121859B (en) | 2008-11-25 | 2011-05-13 | Metso Automation Oy | A method for controlling the repair of a web with a rolling machine and corresponding system |
| US9053413B2 (en) | 2013-07-22 | 2015-06-09 | Xerox Corporation | Automatically identifying locations of printing defects within printed rolls |
| CN104326125B (en) * | 2014-08-28 | 2016-08-24 | 北京凌云光技术有限责任公司 | Flaw label tracking and device |
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| CN104637156B (en) | 2015-03-06 | 2017-05-24 | 广州广电运通金融电子股份有限公司 | Paper money roll-out control method and device as well as paper money storage equipment |
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| JPS62295862A (en) * | 1986-06-13 | 1987-12-23 | Toshiba Corp | Sheet repair control device for winder |
| FR2670896B1 (en) * | 1990-12-24 | 1994-08-12 | Siderurgie Fse Inst Rech | DEVICE FOR DETECTING FAULTS OF A STRIP WHILE BEING TRIPPED. |
| JP2848028B2 (en) * | 1991-05-29 | 1999-01-20 | 王子製紙株式会社 | Web repair method and repair device |
-
1996
- 1996-08-15 DE DE19632988A patent/DE19632988C1/en not_active Expired - Fee Related
-
1997
- 1997-07-18 CZ CZ0048899A patent/CZ297849B6/en not_active IP Right Cessation
- 1997-07-18 BR BR9714336-7A patent/BR9714336A/en not_active IP Right Cessation
- 1997-07-18 ES ES97937503T patent/ES2165084T3/en not_active Expired - Lifetime
- 1997-07-18 RU RU99105120/12A patent/RU2166017C2/en not_active IP Right Cessation
- 1997-07-18 PT PT97937503T patent/PT922139E/en unknown
- 1997-07-18 DE DE59705791T patent/DE59705791D1/en not_active Expired - Fee Related
- 1997-07-18 EP EP97937503A patent/EP0922139B1/en not_active Expired - Lifetime
- 1997-07-18 CA CA002263211A patent/CA2263211C/en not_active Expired - Fee Related
- 1997-07-18 WO PCT/EP1997/003859 patent/WO1998006897A1/en active IP Right Grant
- 1997-07-18 KR KR1019997001143A patent/KR20000029927A/en not_active Application Discontinuation
- 1997-07-18 AT AT97937503T patent/ATE210762T1/en not_active IP Right Cessation
- 1997-07-18 CN CN97197256A patent/CN1104526C/en not_active Expired - Fee Related
- 1997-07-18 JP JP10509323A patent/JP2001502648A/en active Pending
- 1997-08-14 ID IDP972852A patent/ID17869A/en unknown
-
1999
- 1999-02-09 NO NO19990605A patent/NO313558B1/en not_active IP Right Cessation
- 1999-02-12 PL PL97331586A patent/PL184169B1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| PL331586A1 (en) | 1999-07-19 |
| ID17869A (en) | 1998-02-05 |
| PT922139E (en) | 2002-04-29 |
| WO1998006897A1 (en) | 1998-02-19 |
| ATE210762T1 (en) | 2001-12-15 |
| CN1104526C (en) | 2003-04-02 |
| NO990605D0 (en) | 1999-02-09 |
| NO313558B1 (en) | 2002-10-21 |
| CN1228132A (en) | 1999-09-08 |
| RU2166017C2 (en) | 2001-04-27 |
| PL184169B1 (en) | 2002-09-30 |
| EP0922139A1 (en) | 1999-06-16 |
| CZ297849B6 (en) | 2007-04-11 |
| EP0922139B1 (en) | 2001-12-12 |
| CA2263211A1 (en) | 1998-02-19 |
| BR9714336A (en) | 2000-04-11 |
| ES2165084T3 (en) | 2002-03-01 |
| CZ48899A3 (en) | 1999-07-14 |
| DE19632988C1 (en) | 1998-01-22 |
| NO990605L (en) | 1999-02-09 |
| JP2001502648A (en) | 2001-02-27 |
| DE59705791D1 (en) | 2002-01-24 |
| KR20000029927A (en) | 2000-05-25 |
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| EEER | Examination request | ||
| MKLA | Lapsed |