JPH04354760A - Method and device for repair of web - Google Patents

Abstract

PURPOSE:To repair a minor defect of a web such as a hole automatically, effectively, and precisely by affixing a patch to the defect. CONSTITUTION:The position of a defect of a web 1 is sensed, and on the basis of information as the result from sensing, the feed is decelerated on the way of rewinding of web roll 10a made by a rewinding device 6, and passage of the defect is sensed by a sensor 8 in this decelerated condition. On the basis of the sensing signal thus obtained, a patch 15 with adhesives in standby in protrusive state from an exfoliation edge 13 in a downstream position is pressed to the over-part of the web defect by a pressure roller 14. Thus affixation is made, and web is repaired.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for repairing defective portions of a web before the web is subjected to the next process.

0002

[Prior Art] Webs (base paper) produced by paper machines may have defects such as seams caused by paper cuts and holes (generally about 0.5 to 20 mm in diameter) caused by various factors, In this state, it is necessary to repair these defective parts because they will cause problems in the following various coating processes.

[0003] That is, the seam created by the paper cut mentioned above is
It is common for the spliced starting end to simply be rolled up onto a good web and not completely integrated, resulting in wrinkles. Therefore, with respect to such joints, the defective portions are removed and rejoined with double-sided tape or adhesive before being subjected to the coating process.

On the other hand, when there is a small defect such as a hole,
For example, in the blade method of coating, in which the target amount of coating is achieved by scraping off excess paint with a blade after coating, the paint adheres to the roll surface on the opposite side from the coated surface of the web through the defective part. This may cause the web to stick to the roll and break, or be transferred to the back side of the web, resulting in defects. Furthermore, in the case of air knife coating, in which the target coating amount is obtained by blowing air after coating the paint to remove excess paint, the web may tear due to air being trapped in the defective areas. Therefore, for these small defects, holes etc. are usually filled up by pasting a patch consisting of a piece of paper about 30 mm square attached to the center of a piece of adhesive paper about 50 mm square.

[0005] Conventionally, the above-mentioned repair operation has been carried out by optically detecting a defective part of a running web using a defect detecting means installed at the end of the papermaking process, and then checking the winding roll of the web in which the defective part has been detected. After marking the vicinity of the defective part on the side end surface, the worker monitors the markings during the process of rewinding the take-up roll using a rewinding device, the reeler, and when the vicinity of the defective part approaches the unwinding position. The procedure is to reduce the speed of the reeler and visually locate the defect while feeding the web slowly, then stop the reeler, make the necessary repairs manually, and then return the reeler to its normal feed speed. ing.

[0006]

[Problems to be Solved by the Invention] However, in the above-mentioned conventional repair means, the entire series of operations for switching the operation of the rewinding device and repairing is performed manually, which is very time-consuming and requires a dedicated worker. In addition, it is difficult to detect minute defects with the naked eye, such as those with a diameter of 0.5 mm, and it takes a long time to detect them, and defects are easily overlooked, and repair accuracy is also poor. Information on detecting defective parts was not fully utilized.

[0007] In view of the above-mentioned circumstances, the present invention is particularly aimed at cases where the defective portion of the web is small such as a hole.
It is an object of the present invention to provide a repair method and a repair device that completely automate repair by pasting a patch to the defective part.

[0008]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the web repair method according to the present invention detects a defective portion of a web together with its position, and then detects the defective portion of the web when the web roll having the defective portion is being rewinded. Based on the detection information of the defective part, the web feed is decelerated before the defective part reaches the sensor position on the rewinding track, and then the sensor detects passage of the defective part, while A patch with adhesive attached to the release tape on the side is made to stand by in a protruding state beyond the release edge where the tape wraps, above the passing position of the defective part, and this patch is attached to the web based on the detection signal of the sensor. The structure is characterized in that the adhesive is pressed onto the defective part.

[0009] According to the present invention, a preferred embodiment of the above repair method is such that the web feeding during rewinding is set such that the deceleration speed during repair is 0.1 to 50 m/min.

[0010] Furthermore, the web repair device according to the present invention includes:
Similarly, for the above purpose, there is provided a defect detecting means for detecting a defective part of a running web together with its position, a rewinding device for unwinding the web roll in which the defective part is detected and rewinding it onto another take-up roll; A sensor is installed on the rewinding track to detect passage through the defective area, and a tape with adhesive patches pasted at regular intervals is intermittently fed out on the rewinding track downstream of the sensor to remove the peeling edge. a patch supplying device for winding the patch through the peeling edge, a pressing head for pressing the patch protruding from the peeling edge onto the web surface, and a temporary deceleration of the web feeding of the rewinding device based on the detection information of the defect detection means. The present invention employs a configuration comprising a rewinding device drive control means, and a press head drive control means that presses the press head when the defective part passes under the defective part based on a detection signal from the sensor. be.

[0011]

[Operation] The defect detection means detects small defects such as holes and thin parts in a continuously running web, and also detects the length from the starting end of the roll, that is, the position in the longitudinal direction, and the position in the width direction of the web. Record. The detection mechanism uses various optical methods, such as detecting the difference in light transmittance between a normal part and a defective part of the web using a pair of light-emitting elements and light-receiving elements, or detecting the difference in light reflectance of the web. means are used.

The rewinding device unwinds the winding roll of the web in which the defective portion has been detected and rewinds it onto another winding roll. The established repair station is equipped with an adhesive patch supply device and a pressing head. Thus, the longitudinal position information of the defective part recorded by the defect detection means in the previous step is input to the rewinding device drive control means, and the control means causes the unwinding of the web roll to be adjusted to the position of the defective part. The web is fed at high speed until it approaches the position, and when it approaches the position, it is decelerated and set to a constant low speed.

[0013] On the other hand, the patch supply device is similar to a normal adhesive label supply machine in that it intermittently feeds out a releasable tape on which patches with adhesive are pasted at regular intervals and winds it up through the peeling edge. By bending the tape at an acute angle and moving at the peeling edge, the patch peels off from the tape and protrudes forward from the edge. Therefore, in this case, the patch remains in a protruding state and waits at the position where the web passes through the defective portion.

After the web feeding is switched to the above-mentioned low speed, the sensor detects passage of the defective part, and based on this detection signal, the press head driving means starts the press head after a predetermined time lag from the detection. When the patch is pressed, the waiting patch is pressed onto the defective part by the pressing head and adhered to cover the defective part. After the applicator head is then retracted upward, high-speed feeding of the web is resumed by the rewinding device drive control means. Of course, if there are multiple defects in one roll of web, the above automatic operation will be repeated. The timing of the pressing operation of the pressing head is precisely set based on the relationship between the low feeding speed and the distance from the sensor to the patch standby position.

[0015] Since the patch is attached as described above while the web is running at a low speed, the change in tension of the web in the rewinding device is small compared to when the patch is attached while the web is completely stopped. Abnormalities such as wrinkles and misalignment of cutting lines are less likely to occur, and time loss required for repairs is also reduced. Therefore, it is best to set the deceleration speed of the rewinding device to 0.1 to 50 m/min during repair.
If the deceleration speed is too low, the above-mentioned abnormality is likely to occur and time loss increases; on the other hand, if the deceleration speed is too high, it becomes difficult to apply the patch accurately.

[0016]

[Example] Figure 1 shows the end of the papermaking process, in which the web 1 is dried by drying drums 2, 2, etc., passed through guide rolls 3, 3, and wound onto a reel 4 until a certain amount of winding is reached. Then, it is taken out as a winding roll 10a. Therefore, between the guide rolls 3 and 3, there is a light emitting part 5a and a light receiving part 5.
A defect detection device 5 is installed, and the detection device 5 detects a defective portion existing in the running web 1, and detects the defective portion from the winding start end of the winding roll 10a. The length, that is, the position in the longitudinal direction and the position in the web width direction are recorded, for example, as a mark sheet.

FIG. 2 shows a reeler 6 which is an example of a rewinding device.
By unwinding the winding roll 10a in which a defective portion has been detected by the defect detection device 5 from the unwinding machine 6a, passing through guide rolls 7a, 7b, and 7c, and winding it up by the winding machine 6b. , another take-up roll 10
b. A sensor 8 consisting of a light emitting part 8a and a light receiving part 8b is provided movably in the width direction of the web 1 on the upstream side while the web 1 is running, and an automatic patch pasting is provided before the guide roll 7b on the downstream side. A device 9 is arranged above the web 1.

This automatic patch applicator 9 has a patch tape roll 11a mounted on the top of a base 9a which is set to be movable in the width direction of the web 1, and a patch tape 12 fed out from the roll 11a onto the base 9a. The peeling edge 13 is provided with a tape feeding mechanism for winding the tape onto the take-up tape roll 11b via the peeling edge 13 attached to the lower part of the peeling edge 13.
It has a vertical drive mechanism for a pressure roller 14 disposed slightly in front of. Here, as shown in FIG. 3, the patch tape 12 has patches 15 stuck at regular intervals on one side of a releasable tape 12a made of paper or synthetic resin. Each patch 15 is, for example, as shown in FIG. 4, having an adhesive surface 15b on the periphery of the back surface of a square piece of paper 15a. Usually, the size of the paper piece 15a is about 50 to 100 mm square, and the width of the adhesive surface 15b is about 50 to 100 mm square. is set to about 10 to 20 mm.

As shown in FIG. 5, each patch 15
When the patch tape 12 bends at an acute angle and passes through the release edge 14, it is peeled off from the release tape 12a and pushed forward from the release edge 13, but the application device 9
5 to 15m of the front end before repair using the tape feeding mechanism.
It is set to stand by in a state where about m is projected from the peeling edge 13. Further, the pressing roller 14 waits directly above the protruding portion of the patch 15 as shown by the solid line in the figure.

On the other hand, as shown in FIG. 2, the reeler 6 is provided with a control device 16 that controls the feeding of the web 1 and the driving of the pasting device 9. And this control device 16
The positional information of the defective part obtained by the defect detection device 5 is inputted, and based on this information, the web 1 is moved 80 degrees until the position of the defective part in the longitudinal direction of the web approaches the unwinding part.
It is fed at a high speed of 0 to 1000 m/min, but when it approaches the unwinding part, the driving speed of the unwinding machine 6a and the winding machine 6b is reduced and switched to a predetermined low speed feeding, and the sensor 8 and the pasting device 9 are The standby position in the web width direction is set to be almost directly above the defective part.

When the reeler 6 is switched to the above-mentioned low speed feed, the sensor 8 detects passage of the defective part, and based on this detection signal, the control device determines whether the waiting patch 15 is exactly above the defective part. Then, when the defective part passes under the patch 15, the pressing roller 14 is rotated by the arm 14a as shown by the two-dot chain line in the figure. lower it. As a result, the front end side of the patch 15 is pressed onto the web 1, and at the same time, the tape feeding mechanism of the pasting device 9 feeds the patch tape 12 by a certain length at a speed synchronized with the feeding of the web 1, so that the patch 15 completely reaches the rear end. Then, it is separated from the release tape 12a and adhered to the defective surface of the web 1 as the web 1 advances by a pressure roller. Note that since the adhesive surface 15b of the patch 15 is provided only on both edges, the adhesive is not exposed on the back surface through the defective portion.

[0022] When this repair is completed, the pressure roller 14 is retracted upward, high-speed feeding of the web 1 is resumed, and the winding roll 10b, which has finally been re-wound, is subjected to a predetermined coating process. Ru. In addition, if there are multiple defective parts that require repair, the sensor 8 and the pasting device 9 are moved according to the command from the control device 16 so as to be directly above the defective part passing position in the web width direction, and the pasting The patch tape 12 of the device 9 is slightly fed, and the next patch 15 is placed in a standby state with its front end protruding from the peeling edge 14 in the same manner as described above, and from then on, the defective portion is repaired in the same manner as described above. Become.

In the above embodiment, the position of the sensor 8 and the automatic patch applicator 9 is adjusted in the width direction of the web 1 by the control device 16. However, if a sensor whose detection range covers the entire width of the web is used, the above position adjustment is possible. becomes unnecessary. In addition, by increasing the number of pasting devices 9, the individual position adjustment range can be shortened, and if they are fixedly arranged in multiple rows to cover the entire width of the web, the position adjustment and position correction after detection by the sensor 8 can be made easier. No longer needed. Therefore, if the sensor 8 and the automatic patch applicator 9 are structured so that no adjustment of the position in the web width direction is required, it becomes possible to increase the web feed speed during repair to the feed speed limit of the patch tape, and the repair speed increases accordingly. Increased efficiency.

[0024] In addition, in the present invention, the detailed configurations of the defect detection means in the paper making process, the sensor in the rewinding device, the drive control means for the rewinding device and the press head, the press head, the patch supply means, etc. may be modified in various ways other than those shown in the examples. Design changes are possible. For example, as the sensor, optical detection means other than those exemplified, such as detection based on a difference in light reflectivity of the web 1 or detection using laser light, or detection means using magnetism, capacitance, etc. may also be employed.

[0025]

Effects of the Invention: According to the repair method and repair device of the present invention, small defects such as holes in the web caused in the previous process can be completely repaired by pasting patches without the need for manual work as in the past. This can be done automatically, resulting in labor savings and cost reductions due to the unmanned repair process.
Moreover, since the defective part is detected by a sensor when rewinding the web for repair, it is not affected by fluctuations in the position of the defective part in the longitudinal direction in the previous process due to the elasticity of the web, and accurate positioning can be achieved through precise positioning. In addition to making repairs possible, the repairs can be done while the web is decelerating without stopping the web feed.
The occurrence of defects such as wrinkles in the web due to the stoppage can be prevented, and the time loss required for repairs can be significantly reduced.

[0026] Furthermore, according to the second aspect of the present invention, there is an advantage that repairs can be easily and reliably performed using a patch attached to a releasable tape.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing the end of the papermaking process.

FIG. 2 is a schematic side view of a reeler that is an example of a rewinding device.

[Figure 3] Plan view of patch tape.

[Figure 4] Rear view of the patch.

FIG. 5 is a vertical sectional side view of the main parts of the reeler at the repair position.

[Explanation of symbols]

1 Web 5 Defect detection device 6 Rewinding device (reeler) 8
Sensor 9 Automatic patch application device (patch supply device)
10a Winding roll 10b Winding roll 12 Patch tape 12a Release tape 13 Peeling edge 14 Pressing roller (pressing head) 15 Patch, 15b Adhesive surface 16 Control device (rewinding device drive control means and pasting head drive control means)

Claims (3)

[Claims] 1. After detecting the defective part of the web together with its position, while the web roll having the defective part is being rewinded, the sensor position of the defective part on the rewinding track is determined based on the detection information of the defective part. The web feed is decelerated before the sensor reaches the defect, and the sensor detects the passage of the defect, while the tape wraps around the adhesive patch downstream of the sensor and peels off. A method for repairing a web, the method comprising making the patch stand by in a protruding state above the passing position of the defective part from the edge, and pressing and pasting this patch onto the defective part of the web based on a detection signal from the sensor. 2. The web repair method according to claim 1, wherein the web feeding during rewinding is set so that the deceleration speed during repair is 0.1 to 50 m/min. 3. Defect detection means for detecting defective portions of a traveling web together with their positions; a rewinding device for unwinding the web roll in which the defective portion has been detected and rewinding it onto another take-up roll; A sensor is installed on the rewinding track to detect passage through the defective part, and a tape with adhesive patches attached at regular intervals is intermittently fed out on the rewinding track downstream of the sensor to remove the peeling edge. a pressing head for pressing the patch protruding from the peeling edge onto the web surface; and a winding device for temporarily decelerating the web feed of the rewinding device based on the detection information of the defect detection means. A web repairing device comprising: a changing device drive control means; and a press head drive control means that presses the press head when a defective portion passes under the defective portion based on a detection signal from the sensor.