JP4343456B2 - Defect marking method and apparatus for sheet-like product - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a defect marking method and apparatus for sheet-like products such as synthetic resin films.
[0002]
[Prior art]
Conventionally, in the manufacturing process of synthetic resin films and papers, various treatments are automatically performed in a long strip shape with a constant width, and finally cut into a predetermined shape according to product specifications. . Detection of a defective portion that does not satisfy the product specification is also automatically performed in a belt-like state, and marking is performed so that the defective portion can be easily identified in a later process. For example, when manufacturing a polarizing plate used for a liquid crystal display panel, a long strip-shaped intermediate product is continuously formed in the process of molding a synthetic resin film or imparting polarization characteristics by stretching in a certain direction. Are processed in each step, and are cut in a size and direction determined in advance by the product specifications. In order to automatically inspect the defect, it is necessary to detect the defect and to mark the defect along the conveyance path of the sheet-like product.
[0003]
FIG. 6 shows a general defect marking method. FIG. 6A shows a schematic configuration of the apparatus, and FIG. 6B shows a state of a product on which marking is performed. As shown in FIG. 6 (a), in the marking device, the surface of a sheet-like product 1 conveyed at a constant speed with a constant width is imaged with a camera 2, and the defect 3 is detected by image processing. Do. On the downstream side in the conveyance direction of the sheet-like product 1, markers 4 are arranged at one or both ends in the width direction. When the defect 3 is detected by the camera 2, the marker 4 is aligned with the timing at which the portion including the defect 3 in the width direction is conveyed from the position where the camera 2 is disposed to the position where the marker 4 is disposed. Actuated. A linear mark 5 is drawn on one side edge or both side edges of the portion including the defect 3 in the width direction. As shown in FIG. 6B, when the sheet-like product 1 is wound up to form a roll 6, the mark 5 looks spiral from the side. For paper or the like, the portion to which the mark 5 is applied is excluded, and the paper is used separately in the length direction.
[0004]
FIG. 7 shows the concept of marking in the defect marking apparatus for sheet-like products disclosed in Japanese Patent Application Laid-Open No. 9-304295. In this prior art, a marking device disposed downstream in the conveying direction of the sheet-like product 1 is movable in the width direction with respect to the detection means for optically detecting the defective portion. Based on the position information of the defect location detected by the detection means, the pen of the marking device is moved to the position of the defect in the width direction, and the tip of the pen is formed into a sheet at the timing when the vicinity of the defect location is transported to the pen position. Control to contact the surface of the product 1 is performed. By such control, the mark 7 can be directly marked at the position of the defect 3 on the surface of the sheet-like product 1.
[0005]
[Problems to be solved by the invention]
However, the defect marking method shown in FIGS. 6 and 7 generally uses an ink jet jet type or contact type pen using oil-based ink or water-based ink, and by attaching colored ink in the vicinity of the defective part. Although the defect is recognized, if marking is performed on the sheet-like product and then the sheet-like product is subjected to chemical treatment in a subsequent process, the marked ink may be blurred or disappear. Further, when the sheet-like product comes into contact with other members, the marking may be scraped off and disappear. Examples of the post-process include a process of saponifying the raw material member with an alkaline solution when manufacturing a polarizing plate.
[0006]
Further, in the marking on the end portion in the width direction as shown in FIG. 6, the information is only that the defect 3 exists somewhere in the width direction in the length range where the mark 5 is applied on the sheet-like product 1. Not get as. For this reason, when the slit or trimming for cutting off the side edge portion is performed, the mark 5 portion is cut off, and the information about the position of the defect 3 is completely lost. Therefore, when the sheet-like product 1 is cut finely, it is necessary to first remove the portion provided with the mark 5 in the length direction.
[0007]
However, in the portion to be removed in the length direction, the defect 3 is included, and at the same time, there are many good portions where the defect 3 is not detected. Removing many good parts reduces the product yield. In addition, if the sheet-like product 1 is cut in the length direction prior to the fine cutting step, the fine cutting step cannot be continuously performed, and the productivity is lowered.
[0008]
The direct marking on the defective part as shown in FIG. 7 cannot reflect the information about the existence range of the defect 3 in the width direction. In the manufacturing process of the sheet-like product 1 continuous in a strip shape, the defect 3 may occur with a certain length in the width direction due to the influence of a roll or the like, or may occur in a plurality of locations in the width direction. In contrast to the case where information on the width direction is also necessary, as disclosed in Japanese Patent Laid-Open No. 9-304295, the idea of directly marking the defective part by moving the pen is one place in the width direction. Only marking can be applied. For this reason, when the sheet-like product 1 is cut to cut out a section having a certain shape, even if the defect 3 exists, the section is provided with the mark 7 and the section without the mark 7. As a result, it is not known that the defect 3 is present in the section where the mark 7 is not applied, and it may be determined that the defect 3 is not present.
[0009]
A main object of the present invention is to provide a defect marking method and apparatus for a sheet-like product that can reliably detect a marking indicating a defective portion of the sheet-like product in a subsequent process.
Another object of the present invention is to ensure that when a sheet-shaped product is cut and a section having a certain shape is cut out, the section does not contain any defects, and a decrease in yield is suppressed. It is an object of the present invention to provide a method and apparatus for marking defects in sheet-like products.
[0010]
[Means for Solving the Problems]
The present invention is a marking method for clearly indicating a defect when a defect is detected in a sheet-like product having a certain width and conveyed in a length direction perpendicular to the width direction, A plurality of scratching members are arranged at predetermined intervals in the width direction of the sheet-like product, and virtual blocks are partitioned on the surface of the sheet-like product in accordance with the arrangement pitch of the scratching members in the width direction. When there is a defect inside, the scratching members at the positions on both sides in the width direction of the block are selected, and when the defect is long in the width direction and covers a plurality of blocks, the defect is sandwiched from both sides in the width direction. Make marking scratches on the sides and all sides between them This is a defect marking method for sheet-like products.
[0011]
According to the present invention, marking marks are provided to clearly indicate the defective part of the sheet-like product, so that the marking does not spread or disappear even if a chemical such as a solvent adheres to the marking part in the subsequent process. Even if the sheet-like product comes into contact with another member, the marking is not scraped off and disappears.
[0013]
According to the present invention, the scratch for marking is made in the vicinity of the predetermined range on both sides in the width direction of the defect portion, so that the defect portion is located between the positions where the scratch for marking is made in the width direction. It can be easily recognized that it exists, and it can be assured that there is no defective portion outside the position where the scratch for marking is made. Since the marking scratches are applied to a position that is in the vicinity of a predetermined range with respect to the defective portion, it is possible to prevent the marking portion from being greatly separated from the defective portion. If a sheet-shaped product is cut and a section having a certain shape is cut out to obtain a product, if the section that is marked for marking is removed, the product will contain a defect. It is possible to reliably guarantee that there is no occurrence and to suppress a decrease in yield.
[0015]
According to the present invention, when the detected defective portion occupies a large range in the width direction, even if marking scratches are applied to positions near the predetermined range on both sides, the marking scratches are applied on both sides. The interval between the positions increases. By marking scratches in the middle in the width direction, it is possible to clearly show the presence even in the middle of a wide range of defective portions.
[0016]
The present invention also provides a sheet-like product having a constant width and conveyed in a length direction perpendicular to the width direction. Lack of Detecting defects while detecting Fall into A device for scratching for marking purposes,
Provided with a plurality of scratching members arranged at predetermined intervals in the width direction of the sheet-like product Marking means; A virtual block is defined on the surface of the sheet-like product according to the arrangement pitch of the scratching members in the width direction, and (i) when there is a defect inside each block, (Ii) When the defect is long in the width direction and extends over a plurality of blocks, the position of the side sandwiching the defect from both sides in the width direction and all the sides between them are selected and actuated. It is configured to select and actuate the scratching member arranged at the position of, and to mark the scratch for marking And a defect marking device for a sheet-like product.
[0017]
According to the present invention, when a defect is detected in the sheet-like product, the marking means disposed on the downstream side in the conveyance direction of the sheet-like product with respect to the detection position on both sides in the width direction of the detected defect portion. Since the scratch for marking is made in the vicinity of the predetermined range, it can be easily recognized that a defective portion exists between the positions where the scratch for marking is made in the width direction. . It can be assured that there is no defective part outside the position where the marking flaw is applied, and the marking flaw is in the vicinity of a predetermined range with respect to the defective part. Since it is applied to the position, it can be prevented that the position where the scratch for marking is scratched and the defective portion are largely separated, and the sheet-shaped product is cut to cut out a section having a certain shape. If the product is made of a product that does not include markings that have scratches for marking, it can be assured that the product does not contain defective parts, and a decrease in yield can be suppressed. .
[0019]
According to the present invention, the marking means includes a plurality of scratching members arranged at predetermined intervals in the width direction of the sheet-like product, and the vicinity of a predetermined range in the width direction of the defective portion among the plurality of scratching members. The scratching member arranged at the position to be selected is selected by the control means, and marking scratches can be made on both sides in the width direction of the defective portion. Since it is only necessary to select a scratching member arranged in the width direction, it is easy and quick to mark the presence of defects that widen in the width direction or multiple defects. Can be made.
[0020]
In the present invention, the detection of the defective portion is performed by a plurality of detection means arranged at predetermined intervals in the width direction of the sheet-like product,
A predetermined number of the scratching members are associated with each detection means,
The control means selects and operates the associated scratching member for each detection means based on the defect detection result from each detection means.
[0021]
According to the present invention, the defect direction is detected by sharing the width direction of the sheet-like product with a plurality of detection means, and if a defect is detected, each damage member associated with each detection means is detected. It can be selected corresponding to the defect detection position by the means, and the selected scratching member can be operated to mark the scratch for marking. Since a plurality of detection means are arranged in the width direction, even when a plurality of defects are detected, the position of each defect can be detected with high accuracy, and marking defects can be reliably attached in the vicinity of each defect portion. it can.
[0022]
Further, in the present invention, a support material (for example, a cushioning material such as a rubber roll or a rubber plate) for supporting the sheet product at the time of scratching is positioned below the scratching member, and between the scratching member and the support material. The sheet-like product passes therethrough.
[0023]
According to the present invention, since the support material is positioned below the scratching member, not only the conveyance of the sheet-like product proceeds smoothly, but also when the scratching member scratches the support material, By being a cushioning material, it is possible to maintain an appropriate pressure of the damaging member on the sheet-like product.
[0024]
In addition, the present invention is characterized in that it includes means for removing deposits on the surface of the sheet-like product, which is arranged downstream of the marking means in the conveying direction of the sheet-like product.
[0025]
Deposits on the surface of the sheet-like product generated by scratching with the scratching member can be removed by the deposit removing means located on the downstream side of the sheet-like product in the conveying direction with respect to the marking means. Examples of such means include an air suction device that sucks and removes deposits, and a blower that blows away deposits.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a schematic configuration of a marking device 10 as an embodiment of the present invention. The sheet-like product 11 is a transparent synthetic resin film used, for example, as a polarizing plate of a liquid crystal display device, and is a liquid crystal display device with high definition even if it is a small surface defect that is difficult to identify with the naked eye. The display image quality of the image is reduced. Even with a relatively wide range of defects, it may be difficult to determine with the naked eye. Even a defect that is difficult to distinguish with the naked eye can be detected as a defect 13 by performing various types of image processing on the image of the surface of the sheet-like product 11 captured by the imaging unit 12.
[0027]
The sheet-like product 11 is not particularly limited as long as it is a general synthetic resin film, and a synthetic resin film coated with a special layer in order to add a certain function to the synthetic resin film, or these are bonded. Even if it is a form, it does not interfere. For example, not only the polarizing plate of the liquid crystal display device, but also a polarizer film, a protective film, a retardation film, or other functional film constituting the polarizing plate.
[0028]
The sheet-like product 11 is conveyed at a constant speed in the conveyance direction 11a, and a marking unit 14 is installed downstream of the detection unit in the conveyance direction 11a. The marking means 14 applies a linear marking flaw 15 (hereinafter referred to as a flaw mark 15) parallel to the transport direction 11 a on the surface of the sheet-like product 11. The sheet-like product 11 is pulled out from the state wound on the roll 16 and becomes an inspection object. Illumination by the illumination device 17 is also important in order to reliably detect the defect 13 to be inspected from the image captured by the imaging means 12. The illumination device 17 performs uniform illumination over the entire width of the sheet-like product 11.
[0029]
As the illumination device 17, a tubular light emitter such as a fluorescent lamp or a linear light source such as a transmission light is used. In the transmission light, a powerful light source such as a metal halogen lamp is disposed on the end face in the axial direction of a rod-shaped light guide, and the light incident on the end surface is guided to the side surface between both end surfaces to function as a rod-shaped light source. Laser light can be spread and irradiated. The light that the illuminating device 17 irradiates the sheet-like product 11 is set so as to have a wavelength and polarization characteristics that facilitate detection of the defect 13. The combination of the imaging means 12 and the illumination device 17 determines the types of defects 13 that can be efficiently detected. In order to make it possible to detect a plurality of types of defects 13, a plurality of combinations of the imaging unit 12 and the illumination device 17 are arranged along the transport direction 11a, and if any type of the defect 13 is detected, the marking unit The scratch mark 15 may be attached by 14.
[0030]
The conveyance speed of the sheet-like product 11 is detected by the conveyance speed detection device 18. The output from the conveyance speed detection device 18 is input to the control unit 20 together with the image processing result from the image processing device 19 that performs predetermined image processing on the image captured by the imaging unit 12. The control unit 20 is realized by, for example, an industrial personal computer, and performs determination of the presence / absence of a defect from the image processing result and detection of a position when the defect 13 exists. The control means 20 further adjusts the timing based on the output from the conveying speed detection device 18 so as to place the scratch mark 15 within a predetermined vicinity in the width direction with respect to the defect existing position, and thereby the marking means 14 is activated. The imaging means 12 includes a plurality of cameras 21 in the width direction. The marking means 14 includes a plurality of scratching members 31 in the width direction. The scratching member 31 attaches a linear scratch mark 15 parallel to the transport direction 11 a on the surface of the sheet-like product 11.
[0031]
As the scratch member 31, for example, a member such as a grindstone material 50 shown in FIG. 5 can be used. A plurality of grindstones 50 are arranged on the marking means 14 such that the cone-shaped grindstone 52 is positioned below, and the grindstone 50 descends in the vicinity of the defective portion 13 so that the grindstone 52 contacts the surface of the sheet-like product 11. And attach a scratch mark 15. For example, when the sheet-like product 11 is a transparent film, the scratch mark 15 becomes a white scratch that can be detected by an inspection means such as an optical inspection means or a visual inspection means.
[0032]
The support member 22 is located below the scratching member 31. The support material 22 serves as a cushioning material, and an appropriate pressure can be maintained when the scratching member 31 damages the sheet-like product 11. A rubber roll is preferably used as the support member 22, but any material can be used as long as it functions as a cushioning material such as a rubber plate.
[0033]
FIG. 2 shows a concept of marking the flaw mark 15 by the marking unit 14 with respect to the defect 13 detected by the imaging unit 12 as the detection unit in the present embodiment. The imaging means 12 has a plurality of cameras 21 arranged in the width direction at regular intervals. Each camera 21... Includes, for example, a one-dimensional CCD sensor in which 5000 pixels are arranged at high density as an image sensor. Since the workpiece width, which is the width of the sheet-like product 11 to be inspected, is in the range of, for example, 800 to 1300 mm, the inspection area as the imaging means 12 has a width of 1300 mm. Six cameras 21 are arranged in this inspection area, and the visual field 21a of each camera 21 is set to 250 mm. The visual field 21a of each camera 21 is overlapped with the visual field 21a of the adjacent camera 21 at the boundary.
[0034]
In the marking means 14, a plurality of scratching members 31 are arranged in the width direction at regular intervals, for example, 20 mm intervals. Each of the scratching members 31 is positioned on an extension of the visual field 21a of one of the cameras 21 in the transport direction 11a. 1 detects the defect 13 in the images from the respective cameras 21..., Selects the nearest scratching member 31 sandwiching both sides of the defect 13 in the width direction, and the selected scratching member 31 is selected. If there is a scratching member 31 between them, it is also selected and operated. A linear scratch mark 15 can be formed in the transport direction 11a by making the scratching member 31... In general, when the defect 13 is detected between the positions of the scratching members 31..., Scratch marks 15 are formed on both sides of the detection position, and a marking scratch is applied. When the polarizing plate is cut out, an inclined cut as shown by a broken line is performed, and only those having no scratch marks 15 on the cut sections are shipped as non-defective products. Discard it as a defective product.
[0035]
Further, deposits (scraps) on the surface of the sheet-like product generated when the tip of the scratching member 31 is brought into contact with the surface of the sheet-like product 11 and scratched are formed on the sheet-like product with respect to the marking means 14. 11 is removed by an air suction device 23 for removing deposits on the surface of the sheet-like product 11 disposed on the downstream side in the transport direction.
[0036]
FIG. 3 shows an outline of the entire process for manufacturing the sheet-like product 11 as a polarizing plate. Manufacturing is started from step s1, and the manufacturing process as the sheet-like product 11 is ended in step s2. In step s3, a defect is automatically inspected by the detection means of the present embodiment. As a result of the automatic inspection, if the defect 13 is detected as NG, the scratch mark 15 is attached so as to sandwich the defect 13 from both sides in the width direction in step s4. If the defect 13 is not detected as a result of the automatic inspection in step s3, or if the defect 13 is detected and the flaw mark 15 is added in step s4, the process proceeds to step s5 and cutting is performed. When manufacturing a polarizing plate, an oblique cut cut at an oblique angle as shown by a broken line in FIG. 2 is performed. Each section portion separated by cutting in step s5 is a target of inspection of the scratch mark 15 in step s6 and visual inspection in step s7.
[0037]
In the inspection of the marking flaw in step s6, even if the defect 13 is difficult to discriminate with the naked eye, the flaw mark 15 is attached so as to sandwich both sides thereof, so that it can be easily discriminated. Even if the scratch mark 15 is not found, a visual inspection is performed in step s7. The visual inspection at step s7 determines other defects such as cutting defects. As a result, if the scratch mark 15 and other defects are not found, the product is shipped as a product in step s8, and if the scratch mark 15 or other defects are found, it is discarded in step s9.
[0038]
FIG. 4 shows an example of the control concept when the control means 20 of FIG. 4 (b) and 4 (c) show a scratch mark 15 applied to large defects 13b and 13c in the width direction and the length direction in accordance with the concept of FIG. 4 (a).
[0039]
As shown in FIG. 4A, the surface of the sheet-like product 11 is partitioned by virtual blocks 40. Each block 40 is a square whose sides 41, 42, 43, and 44 are 20 mm in length in accordance with the arrangement pitch of the scratching members 31 in the width direction. The sides 41 and 42 are boundaries on the upstream side and the downstream side in the transport direction 11a, respectively, and the sides 43 and 44 are boundaries on one side and the other side in the width direction. When the defect 13 exists in each block 40, the scratching member 15 is selected at the positions of the sides 43 and 44 on both sides in the width direction, and the scratch mark 15 is marked. When the defect 13 is on one of the sides 43 and 44, the flaw mark 15 is also attached to the side of the block adjacent to the side and facing the side. Therefore, as shown in FIG. 4 (b), a defect 13b that is long in the width direction and spans a plurality of blocks is scratched on the side that is sandwiched from both sides in the width direction and all the sides in between. The mark 15 is attached.
[0040]
In FIG. 4A, when the defect 13 is located on any one of the sides 41 and 42, the flaw mark 15 is provided on both sides in the width direction even in a block adjacent to that side as a boundary. Therefore, as shown in FIG. 4C, the defect 13c that is long in the length direction and spans a plurality of blocks is continuously extended by extending between the blocks to the side that is sandwiched from both sides in the width direction. Scratch mark 15 is attached.
[0041]
Even if a single scratch member is used, a scratch mark that sandwiches both sides of the defect 13 as long as it can move in the transport direction 11a and the width direction at a higher speed than the transport speed of the sheet-like product 11. It is possible to add 15. However, the control of the movement of the scratching member is complicated, and it is difficult to make a reliable scratch mark 15 when a plurality of defects 13 are detected at close positions. Further, if a plurality of scratching members are moved, it becomes possible to make scratch marks 15 on many defects 13 at the same time, but the control becomes more complicated.
[0042]
As the marking means 14, a scratching member 31 such as a needle, a grindstone, or a file can be used. In particular, it is preferable to use a grindstone material 50 in which a cone-shaped grindstone 52 is attached to the tip of a shaft 51 shown in FIG. In addition, although the marking to the synthetic resin film was demonstrated, the sheet-like product 11 in this invention is not limited to a synthetic resin film, Other metal plates, a glass plate, etc. may be sufficient, and the damage member of the hardness according to it 31 may be selected.
[0043]
Further, the scratching member 31 can be applied to a marking method as shown in FIGS. 6 and 7, so that a chemical such as a solvent adheres to a marking portion in a later process, so that the wound member 31 may blur or disappear. Or, when the sheet-like product comes into contact with another member, the marking is not scraped off and disappears.
[0044]
【The invention's effect】
As described above, according to the present invention, the marking damage is made in the vicinity of the defective portion of the sheet-like product. Therefore, the marking damage may be spread by attaching a chemical such as a solvent to the marking portion in the subsequent process. The marking part can be reliably detected in the subsequent process because it does not disappear or the marking-like scratches are not scraped off by contact with other members.
[0045]
According to the present invention, the scratch for marking is made at a position in the vicinity of the predetermined range on both sides in the width direction of the defective portion, so that the defective portion is between the positions where the scratch for marking is made in the width direction. It can be easily recognized that it exists, and it can be assured that there is no defective portion outside the position where the scratch for marking is made. Since the marking flaw is applied to a position in the vicinity of the predetermined range with respect to the defective portion, the position of the marking flaw and the defective portion can be prevented from being greatly separated, and the yield can be reduced. The decrease can also be suppressed.
[0046]
According to the present invention, when the detected defect portion occupies a large range in the width direction, even if the scratch for marking is made in the vicinity of the predetermined range on both sides, the scratch for marking is made on both sides. The interval between the positions increases. By marking scratches in the middle in the width direction, it is possible to clearly show the presence even in the middle of a wide range of defective portions.
[0047]
According to the present invention, the marking means includes a plurality of scratching members arranged at predetermined intervals in the width direction of the sheet-like product, and the vicinity of a predetermined range in the width direction of the defective portion among the plurality of scratching members. The scratching member arranged at the position to be selected is selected by the control means, and marking scratches can be made on both sides in the width direction of the defective portion. Since it is only necessary to select a scratching member arranged in the width direction, it is easy and quick to mark the presence of defects that widen in the width direction or multiple defects. Can be made.
[0048]
According to the present invention, the defect direction is detected by sharing the width direction of the sheet-like product with a plurality of detection means, and if a defect is detected, each scratching member associated with each detection means is detected. It can be selected corresponding to the defect detection position by the means, and the selected scratching member can be operated to mark the scratch for marking. Since a plurality of detection means are arranged in the width direction, even when a plurality of defects are detected, the position of each defect can be detected with high accuracy, and marking defects can be reliably attached in the vicinity of each defect portion. it can.
[0049]
According to the present invention, since the support member is located below the scratching member, when the scratching member scratches the support member, the support member becomes a cushioning material. A moderate pressure can be maintained.
[0050]
According to the present invention, the deposit on the surface of the sheet-like product generated by scratching using the scratching member is located on the downstream side of the sheet-like product in the conveying direction with respect to the marking means. It can be removed by means for removing deposits on the surface.
[Brief description of the drawings]
FIG. 1 is a simplified perspective view showing a schematic configuration of a marking device 10 as an embodiment of the present invention.
FIG. 2 is a view showing a concept when marking scratches are made in the marking device 10 of FIG. 1;
FIG. 3 is a flowchart showing an outline of the entire process of manufacturing the sheet-like product 11 of FIG. 1 as a polarizing plate.
FIG. 4 is a diagram showing an example of a control concept when the control unit 20 in FIG. 1 operates the marking unit 14 to make marking scratches.
FIG. 5 is a front view showing a grindstone material as an example of a scratching member.
FIG. 6 is a simplified perspective view and side view showing the concept of conventional marking.
FIG. 7 is a simplified plan view showing the concept of conventional marking.
[Explanation of symbols]
10 Marking device
11 Sheet products
11a Transport direction
12 Imaging means
13, 13b, 13c Defect
14 Marking means
15 Scratch mark
17 Lighting
18 Conveyance speed detection device
19 Image processing device
20 Control means
21 Camera
22 Rubber roll (support material)
23 Air suction device (attachment removal means)
31 Damaged member
40 blocks
41, 42, 43, 44 sides
50 Whetstone
51 axis
52 Whetstone

Claims (5)

It has a constant width, when the defect is detected in a sheet-like products to be conveyed perpendicular to the length direction in the widthwise direction, a marking method for explicitly Recessed該欠,
A plurality of scratching members are arranged at predetermined intervals in the width direction of the sheet-like product,
A virtual block is defined on the surface of the sheet-like product according to the arrangement pitch of the scratching members in the width direction,
When there is a defect inside each block, the scratching member at the position of both sides in the width direction of the block is selected,
When the defect is long in the width direction and extends over a plurality of blocks , the sheet-like product is characterized by scratching markings at the positions of the sides sandwiching the defect from both sides in the width direction and all the positions in between. Defect marking method. Has a constant width, a device scratch for marking to demonstrate while detecting from defects of a sheet-like products to be conveyed to a vertical length direction to the width direction, the detected defect ,
Marking means comprising a plurality of scratching members arranged at predetermined intervals in the width direction of the sheet-like product ;
A virtual block is defined on the surface of the sheet-like product according to the arrangement pitch of the scratching members in the width direction, and (i) when there is a defect inside each block, (Ii) When the defect is long in the width direction and extends over a plurality of blocks, the position of the side sandwiching the defect from both sides in the width direction and all the sides between them are selected and actuated. And a control means configured to select and actuate the scratching member disposed at a position to mark the scratch for marking, and a defect marking device for a sheet-like product. The detection of defects is performed by a plurality of detecting means arranged at a pre-determined intervals in the width direction of the sheet material,
A predetermined number of the scratching members are associated with each detection means,
The sheet marking product defect marking apparatus according to claim 2 , wherein the control unit selects and operates the associated scratching member for each detection unit based on a defect detection result from each detection unit. The sheet-like product according to claim 2 or 3, wherein a support material for supporting the sheet product at the time of scratching is positioned below the scratching member, and the sheet-shaped product passes between the scratching member and the support material. Product defect marking device. The sheet-like product according to any one of claims 2 to 4 , further comprising means for removing deposits on the surface of the sheet-like product, which is disposed downstream of the marking means in the conveying direction of the sheet-like product. Defect marking device.

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