JP5925609B2 - Sheet product inspection system and sheet product inspection method - Google Patents

Description

  The present invention relates to a sheet-like product inspection method and inspection system, a sheet-like product, and a single-wafer suitable for recording the positions of defects present on the surface of a strip-like sheet-like product.

  As a belt-like sheet-like product, for example, there is a polarizing plate original used for a liquid crystal display device. The process from punching the individual polarizing plates from the strip-shaped polarizing plate original is performed as follows. First, defects such as scratches existing on the surface of the polarizing plate original are detected. When a defect is detected, the defective part is marked, and the polarizing plate raw material is wound and stored on a roll. There are various sizes of polarizing plates as final products, depending on the specifications from users, but they can be used in common as a polarizing plate raw material. Then, if necessary (according to an order from an individual user) at a later date, a polarizing plate product of a necessary size is punched out from the polarizing plate raw material. When obtaining a polarizing plate product, the position where surface defects exist must be avoided. Therefore, it is necessary to detect the defect and store the position of the defect in the storage device. The reason why the position of the defect is memorized is that the polarizing plate product is not punched from the strip-shaped polarizing plate raw material immediately after the defect is detected. That is, the step of detecting the defect position and the step of punching out the polarizing plate product are separate steps, and both may be performed at completely different times. Therefore, after the defect position is detected, this position information is stored in the storage device.

  The following Patent Documents 1 and 2 are given as examples of known techniques for disclosing a technique for detecting defects on the surface of a strip-shaped sheet product.

  In the defect marking apparatus disclosed in Patent Document 1, a defect is detected by acquiring an image of the surface of a sheet-like product and performing image processing, and marking is performed at a position where the defect exists.

  The defect position inspection confirmation method for a web-like material disclosed in Patent Document 2 includes a step of specifying an inspection start position, a step of inspecting and extracting a defect position, and a step of determining two or more reference positions. Yes. The inspection end position is also determined. The defective position is determined based on the reference position.

JP 2002-148198 A (summary) JP 2000-19127 A (Claims etc.)

  The subject of the present invention is as follows. That is, in Patent Document 1, marking is performed directly on the defect position, but by performing marking, the thickness of the sheet-like product is locally increased. After detecting a defect, the sheet-shaped product may be stored in the form of being wound on a roll, but if it is wound on a roll in a marked state, the surface of the sheet-shaped product will be scratched due to the marking. This may cause new defects such as attachment, which is not preferable.

  In Patent Document 2, the defect position (defect position) can be detected and managed by data without performing such marking, but the inspection start position and the inspection end position are used to determine the defect position. When the inspection is performed in a plurality of steps, the inspection start position is shifted and the process of specifying the defect position becomes complicated.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an inspection method and an inspection system for a sheet-like product that can easily perform a process of detecting and specifying a defect position.

In order to solve the above problems, an inspection method for a sheet-like product according to the present invention is as follows.
A step of recording identification information representing a position in the transfer direction at predetermined intervals along the direction in which the sheet-like product is transferred to the end in the width direction of the belt-like sheet-like product;
Reading the recorded identification information;
Detecting the amount of movement in the direction in which the sheet-like product is transferred;
An inspection process for inspecting surface defects of the sheet-like product;
And a step of calculating position information of the detected surface defect based on the read identification information and the detected movement amount, and storing the calculated position information in a storage device. It is.

  The operation and effect of the inspection method with this configuration is as follows. First, identification information indicating the position in the transfer direction is recorded at predetermined intervals on the end in the width direction of the belt-shaped sheet-like product. The position to which this identification information is attached corresponds to the coordinates in the transport direction of the sheet-like product. Moreover, it has the process of detecting the moving amount | distance in the direction where a sheet-like product is conveyed. A position along the transfer direction can be specified by identification information for each predetermined interval and detection of the movement amount. Therefore, when a defect is detected in the step of inspecting the surface defect of the sheet-like product, the defect position can be specified based on the read identification information and the detected movement amount. According to this method, the process of specifying the inspection start position and the inspection end position is not necessary. As a result, it is possible to provide a method for inspecting a sheet-like product that can easily perform processing for detecting and specifying a defect position.

  In addition, each process concerning this invention does not need to be performed continuously. For example, only the process of recording the identification information can be performed separately from the other processes. That is, after recording only the identification information, the sheet-like product may be once wound into a roll.

As a preferred embodiment of the present invention, a step of detecting the amount of movement in the direction in which the belt-like sheet product is moved;
Reading the identification information recorded at the widthwise end of the sheet-like product;
Reading defect position information from the storage device;
Examples include a step of identifying a position of a defect present in a belt-shaped sheet-like product based on the read position information, the detected movement amount, and the read identification information.

  After the identification information is recorded and the defect position information is stored in the storage device, it is necessary to specify the position of the defect in order to obtain individual products from the belt-like sheet product by punching or the like. Accordingly, the position information is read from the storage device, and the defect position can be specified based on the identification information recorded at the end in the width direction of the sheet-like product and the detection of the movement amount. Therefore, it is possible to obtain individual sheet-like products while avoiding areas where defects are formed.

  As identification information according to the present invention, distance data can be used. By the distance data, the position coordinates along the transport direction of the belt-like sheet product can be obtained.

  As the identification information according to the present invention, numerical data having a serial number configuration can also be used. For example, it is possible to simply increase the numerical value by one. Such numerical data can also be used as position coordinates.

  As another preferred embodiment of the present invention, the identification information includes information including date and product name information. By recording such information, it is possible to facilitate the management of the sheet-like product.

In order to solve the above problems, an inspection system for a sheet-like product according to the present invention,
Identification information recording means for recording identification information representing positions at predetermined intervals along the direction in which the sheet-like product is transferred, at the widthwise end of the belt-like sheet-like product;
An identification information reading means for reading the recorded identification information;
A movement amount detecting means for detecting a movement amount in a direction in which the sheet-like product is transferred;
An inspection device for inspecting surface defects of the sheet-like product;
Based on the read identification information and the detected amount of movement, calculation means for calculating the position information of the detected surface defects,
And a storage device that stores the calculated position information.

As a preferred embodiment of the present invention, a second movement amount detection means for detecting a movement amount in a direction in which the belt-shaped sheet product is moved;
Second identification information reading means for reading the identification information recorded at the widthwise end of the sheet-like product;
Second calculation means for specifying the position of the defect present in the belt-like sheet-shaped product based on the position information of the defect read from the storage device, the detected movement amount, and the read identification information; What you have.

  The operation and effect of the inspection system having such a configuration is as described above. Note that there may be a plurality of inspection apparatuses for inspecting the defect, and depending on the characteristics of the strip-shaped sheet-like product, for example, it is possible to cope with the inspection in the case where there are different defects in the depth direction. Alternatively, the defect level can be grasped by performing inspections with different accuracy.

The figure explaining the process of recording identification information on a polarizing plate original fabric (band-like sheet-like product) A diagram showing a specific example of identification information The figure explaining the process of detecting the surface defect of a polarizing plate original fabric The figure explaining the calculation method of the positional information on a defect The perspective view explaining the process of punching a sheet from a polarizing plate original fabric inspected for defects Control function block diagram explaining the process of punching a sheet from a polarizing plate raw material that has been inspected for defects The figure explaining the example of composition which winds up with a roll, without punching a sheet

<Specific examples of sheet-like products>
In explaining the inspection system, a polarizing plate original will be described as an example of a sheet-like product. The polarizing plate original is formed in a long band shape, and individual size polarizing plates are obtained by punching from the film-shaped polarizing plate original. The polarizing plate original fabric N can be obtained by bonding, for example, a TAC film on both front and back surfaces of a PVA film that has been manufactured in advance. It is necessary to detect defects (scratches, foreign matter, etc.) present on the surface or inside of the polarizing plate original fabric N having a multilayer structure.

  The original polarizing plate N is (A) a step of drying a polyvinyl alcohol film subjected to dyeing, crosslinking and stretching treatment to obtain a polarizer, and (B) a step of attaching a protective layer to one side or both sides of the polarizer. (C) The process which heat-processes after bonding, and is manufactured by the manufacturing method containing.

  Each treatment of dyeing, crosslinking and stretching of the polyvinyl alcohol film need not be performed separately and may be performed simultaneously, and the order of the treatments may be arbitrary. In addition, you may use the polyvinyl alcohol-type film which gave the swelling process as a polyvinyl-alcohol-type film. Generally, a polyvinyl alcohol film is immersed in a solution containing iodine or a dichroic dye, dyed by adsorbing iodine or a dichroic dye, washed, and stretched in a solution containing boric acid or borax. After uniaxial stretching at a magnification of 3 to 7 times, it is dried. After stretching in a solution containing iodine or dichroic dye, further stretching (two-stage stretching) in a solution containing boric acid or borax, etc., and then drying, the orientation of iodine increases, and the degree of polarization This is particularly preferable because the characteristics are improved.

  Examples of the polyvinyl alcohol polymer include those obtained by polymerizing vinyl acetate and then saponifying vinyl acetate and a small amount of a copolymerizable monomer such as unsaturated carboxylic acid, unsaturated sulfonic acid, and cationic monomer. Polymerized products and the like can be mentioned. The average degree of polymerization of the polyvinyl alcohol polymer is not particularly limited, and any one can be used, but 1000 or more is preferable, and 2000-5000 is more preferable. Moreover, 85 mol% or more is preferable and, as for the saponification degree of a polyvinyl alcohol-type polymer, More preferably, it is 98-100 mol%.

  The thickness of the manufactured polarizer is generally 5 to 80 μm, but is not limited thereto, and the method for adjusting the thickness of the polarizer is not particularly limited. Ordinary methods such as roll stretching and rolling can be used.

  The adhesive treatment between the polarizer and the transparent protective film as the protective layer is not particularly limited. For example, an adhesive made of a vinyl alcohol polymer, boric acid, borax, glutaraldehyde, melamine, It can be carried out through an adhesive or the like comprising at least a water-soluble crosslinking agent of a vinyl alcohol polymer such as an acid. Such an adhesive layer is formed as a coating / drying layer or the like of an aqueous solution. When preparing the aqueous solution, other additives and a catalyst such as an acid can be blended as necessary.

  A suitable transparent film can be used for the protective film provided on one side or both sides of the polarizer. Among them, a film made of a polymer excellent in transparency, mechanical strength, thermal stability, moisture shielding property, etc. is preferably used. Examples of the polymer include acetate resins such as triacetylcellulose, polycarbonate resins, polyarylate, polyester resins such as polyethylene terephthalate, polyimide resins, polysulfone resins, polyethersulfone resins, polystyrene resins, polyethylene, polypropylene. And other polyolefin resins, polyvinyl alcohol resins, polyvinyl chloride resins, polynorbornene resins, polymethyl methacrylate resins, liquid crystal polymers, and the like. The film may be produced by any of the casting method, calendar method, and extrusion method.

  Moreover, the polymer film described in JP-A-2001-343529 (WO01 / 37007), for example, (A) a thermoplastic resin having a substituted and / or unsubstituted imide group in the side chain, and (B) a substitution in the side chain And / or a resin composition containing an unsubstituted phenyl and a thermoplastic resin having a nitrile group. A specific example is a film of a resin composition containing an alternating copolymer composed of isobutylene and N-methylmaleimide and an acrylonitrile / styrene copolymer. As the film, a film made of a mixed extruded product of the resin composition or the like can be used. Since these films have a small phase difference and a small photoelastic coefficient, problems such as unevenness due to the distortion of the polarizing plate can be eliminated, and since the moisture permeability is small, the humidification durability is excellent.

  Moreover, it is preferable that a protective film has as little color as possible. Therefore, Rth = [(nx + ny) / 2−nz] · d (where nx and ny are the main refractive index in the plane of the film, nz is the refractive index in the film thickness direction, and d is the film thickness). A protective film having a retardation value in the film thickness direction of −90 nm to +75 nm is preferably used. By using a film having a thickness direction retardation value (Rth) of −90 nm to +75 nm, the coloring (optical coloring) of the polarizing plate caused by the protective film can be almost eliminated. The thickness direction retardation value (Rth) is more preferably −80 nm to +60 nm, and particularly preferably −70 nm to +45 nm.

  From the viewpoints of polarization characteristics and durability, an acetate resin such as triacetyl cellulose is preferable, and a triacetyl cellulose film whose surface is saponified with an alkali or the like is particularly preferable. In addition, when providing a transparent protective film on both sides of a polarizing film, you may use the transparent protective film which consists of a polymer which is different in the front and back.

  The thickness of the protective film is arbitrary, but is generally 500 μm or less, preferably 1 to 300 μm, particularly preferably 5 to 200 μm for the purpose of thinning the polarizing plate. In addition, when providing a transparent protective film on both sides of a polarizing film, it can also be set as the transparent protective film which consists of a polymer etc. which are different in the front and back.

  As long as the purpose of the present invention is not impaired, the transparent protective film may be subjected to a treatment for the purpose of hard coat treatment, antireflection treatment, prevention of sticking, diffusion or antiglare, and the like. The hard coat treatment is performed for the purpose of preventing scratches on the surface of the polarizing plate. For example, a hard coating with an appropriate UV curable resin such as a silicone type is applied to the surface of the transparent protective film. It can be formed by a method to be added to.

  On the other hand, the antireflection treatment is performed for the purpose of preventing reflection of external light on the surface of the polarizing plate, and can be achieved by forming an antireflection film or the like according to the prior art. Anti-sticking is used for the purpose of preventing adhesion to the adjacent layer, and anti-glare treatment is performed for the purpose of preventing external light from being reflected on the surface of the polarizing plate and obstructing the visibility of the light transmitted through the polarizing plate. For example, it can be formed by imparting a fine concavo-convex structure to the surface of the transparent protective film by an appropriate method such as a roughening method by a sandblasting method or an embossing method, or a blending method of transparent particles.

  Examples of the transparent fine particles include silica, alumina, titania, zirconia, tin oxide, indium oxide, cadmium oxide, and antimony oxide having an average particle diameter of 0.5 to 20 μm. Alternatively, organic fine particles composed of crosslinked or uncrosslinked polymer particles and the like can be used. The amount of the transparent fine particles used is generally 2 to 70 parts by mass, particularly 5 to 50 parts by mass per 100 parts by mass of the transparent resin.

  Furthermore, the antiglare layer containing transparent fine particles can be provided as the transparent protective layer itself or as a coating layer on the surface of the transparent protective layer. The antiglare layer may also serve as a diffusion layer (viewing angle compensation function or the like) for diffusing the light transmitted through the polarizing plate to expand the viewing angle. The antireflection layer, the antisticking layer, the diffusion layer, the antiglare layer, and the like described above can be provided separately from the transparent protective layer as an optical layer composed of a sheet provided with these layers.

<Configuration of sheet product inspection system>
Next, a preferred embodiment of the sheet-like product inspection method (inspection system) according to the present invention will be described with reference to the drawings.

<Identification information recording process>
FIG. 1 is a diagram illustrating a process of recording identification information on a polarizing plate original N (a strip-shaped sheet-like product). The polarizing plate original fabric N is stored in the form of a roll 1, and the identification information is recorded on the end portion in the width direction of the polarizing plate original fabric N by sequentially pulling out from the roll 1. The polarizing plate original N on which the identification information is recorded is wound into the shape of the roll 2 and stored again. The polarizing plate original fabric N is transferred in the direction of the arrow in FIG. 1 by a transfer mechanism (not shown), and identification information is printed on the end portion in the width direction of the polarizing plate original fabric N. A sheet material (final product) having a predetermined planar shape is finally punched from the polarizing plate original N, but the width direction end of the polarizing plate original N is an area that is not used as a product. Even if the identification information is printed, there is no problem.

  The length measuring device 3 (corresponding to the movement amount detecting means) detects the movement amount of the polarizing plate original N transferred by the transfer mechanism. Specifically, the amount of movement is detected using a rotary encoder that is interlocked with the transfer of the polarizing plate original N. The printing device 4 (corresponding to the identification information recording means) is a device for recording (printing) identification information at the end in the width direction, and includes a print head 4a. For example, an ink jet printer, a laser marker, or the like can be used as the printing device 4, but the printing device 4 is not limited to a specific type of printing device. The identification information is printed at regular intervals along the direction in which the polarizing plate original N is transported. The printing control device 5 controls the printing device 4 based on a signal input from the length measuring device 3. That is, based on the movement amount signal (pulse signal) from the length measuring device 3, a command is given to the printing device 4 so that the identification information is printed at predetermined intervals. The interval at which the identification information is printed is not limited to a specific numerical value, and can be, for example, an interval of 1 m.

  Next, a specific example of identification information will be described with reference to FIG. FIG. 2A shows an example formed by a bar code. Numeric data is printed together with the barcode. The numerical data has a serial number structure, and the numerical values are incremented one by one, 101, 102, 103. The serial number configuration is not limited to the illustrated example, and various methods are conceivable. For example, the numerical value may be decreased by one. The numerical value to be increased or decreased may not be “1”. A character string (a, b, c,...) May be used instead of a numerical value. By printing a numerical value together with the barcode, the operator can also check visually. When reading numerical data, the bar code may be read. The numerical data as described above represents the position coordinates along the transfer direction of the polarizing plate original fabric N.

  FIG. 2B is an example of a two-dimensional code. In the case of a two-dimensional code, a larger amount of information can be recorded as compared with a one-dimensional barcode. Therefore, not only serial number information but also date information and product number can be printed together. The date and time information can record the date and time when the two-dimensional code is recorded. As product information, not only the product number but also the product name and lot number may be printed. In the case of a two-dimensional code, numerical data can be printed together. In the example of FIG. 2B, the date data and the serial number are also printed together.

  According to the above configuration, it is only necessary to print identification information at equal intervals, and there is no need to bother specifying the inspection start position and the inspection end position.

<Defect position detection process>
Next, the process of detecting a defect position will be described with reference to FIG. As described with reference to FIG. 1, the sheet-like product on which the identification information is recorded is temporarily wound on a roll. As shown in FIG. 3, a strip-shaped sheet-like product is sequentially drawn out from the roll 11, and after being inspected, is wound into a roll 12 and stored again.

  The length measuring device 13 has the same function as the length measuring device 3 described in FIG. The reading sensor 6 (corresponding to the identification information reading unit) has a function of reading the identification information printed by the printing device 4. For example, a bar code sensor can be used. The CCD camera 7 (corresponding to image acquisition means) acquires an image of the polarizing plate original N. The CCD camera 7 needs to acquire an image of the entire field of view of the polarizing plate original N in the width direction, and a plurality of CCD cameras 7 may be installed as necessary. The image sensor provided in the CCD camera 7 may be a line sensor or an area sensor.

  The inspection device 8 detects a defect based on image information captured by the CCD camera 7 and also detects a defect position. Defect detection can be performed using an image processing technique, and a known algorithm can be used as a detection algorithm, and description thereof is omitted. The position information of the detected defect is stored in the storage device 9.

<Calculation of defect position information>
Next, a method for calculating defect position information will be described with reference to FIG. In FIG. 4, the polarizing plate original fabric is shown as viewed from directly above. Further, the function of the inspection apparatus 8 is described with reference to a block diagram. The movement amount calculation unit 8a calculates the movement amount of the original film N of the polarizing plate based on the pulse signal input from the length measuring device 13. Specifically, the movement amount (corresponding to the movement distance) from the identification information is calculated using each identification information as a reference. The identification information analysis unit 8b analyzes the read identification information. Specifically, numerical data included in the identification information is analyzed. When data such as date and product number is included, the data is also analyzed. Based on the image information captured by the CCD camera 7, the image processing unit 8c analyzes whether or not a defect exists, and also analyzes the position of the defect. The defect position data analyzed by the image processing unit 8c is the position coordinates in the captured image, and includes the distance (indicated by B in FIG. 4) from the width direction end face of the defect position.

  The defect position calculation unit 8d identifies defect position information in the entire sheet-like product based on the calculation results from the movement amount calculation unit 8a and the identification information analysis unit 8b and the defect position information detected by the image processing unit 8c. To do. The defect position can be specified based on the timing when the image information is taken in by the CCD camera 7, the numerical data of the identification information at that moment, and the movement amount data. That is, as shown in FIG. 4, the position along the transport direction of the original film of the polarizing plate is specified by the distance A from the position where the serial number 103 is recorded (this is obtained by the length measuring device 13). be able to. The position in the width direction can be specified by the distance B (obtained from the image information). The defect position information (serial number 103, distances A and B) obtained as described above is stored in the storage device 9.

  As described above, the defect position can be obtained based on the identification information. Further, since the identification information is recorded at equal intervals, even if the surface of certain identification information is dirty and cannot be read by the reading sensor 6, the position is specified based on other identification information. Is possible. This is possible because the identification information is composed of sequential numerical data.

<Manufacture of single wafers (punching)>
Next, a process of punching (cutting) a sheet from the polarizing plate raw material subjected to defect inspection will be described with reference to FIGS. As shown in FIG. 5, the polarizing plate original fabric N is wound in the form of a roll 21, and when obtaining a sheet, the polarizing plate original fabric N is sequentially drawn from the roll 21. The length measuring device 23 and the reading sensor 16 have the same functions as the length measuring device 13 (corresponding to the second position detecting means) and the reading sensor 6 (corresponding to the second identification information reading means) described in FIG.

  In FIG. 6, the cutter control device 10 operates the cutter 18 to take out the sheet M from the strip-shaped polarizing plate original N. The sheet M has a rectangular shape, for example, and corresponds to the final product. The cutter control device 10 includes a movement amount calculation unit 10a and an identification information analysis unit 10b, which have the same functions as the movement amount calculation unit 8a and the identification information analysis unit 8b described in FIG. The defect position specifying unit 10c (corresponding to the second calculation means) determines the defect position based on the defect position information stored in the storage device 9 and the calculation results of the movement amount calculation unit 10a and the identification information analysis unit 10b. Identify.

  When the sheet 18 is manufactured by operating the cutter 18 (punching device), the sheet M including the defect position is removed by an appropriate method. A distance L between the reading sensor 16 and the cutter 18 is determined in advance. Further, the size of the single wafer (indicated by W in FIG. 6) is also determined in advance. As shown in FIG. 6, if it is known that there is a defect at a distance A from certain identification information (code information “103”) based on the position information of the defect stored in the storage device 9. For example, when the code information “103” is read by the reading sensor 16 and only L + A is transferred, the defect comes to the position of the cutter 18. Therefore, it can be determined whether or not a defect exists in the sheet M punched out by the cutter 18.

  The single wafer M containing the defect can be removed by an appropriate method. Further, as shown in FIG. 5, the remaining part from which the sheet M is punched is wound up separately. Note that the cutter 18 may be operated so that the sheet M is obtained while avoiding the defect position.

<Configuration example without punching a single sheet>
According to the inspection system of the present invention, the position of a defect can be detected with high accuracy (10 mm or less). Therefore, as shown in FIG. 5, the product can be shipped in the form of a roll in which a defect is marked and wound up without being punched into the sheet M. An example of such a configuration will be described with reference to FIG.

  In FIG. 7, a marking device 17 is provided to perform marking at a defect position. The marking device 17 is controlled by the marking device control unit 15. The marking device 17 includes a magic 17a movable along the width direction of the polarizing plate original, and performs marking at a defect position. Further, the length measuring device 23, the reading sensor 6, the movement amount calculation unit 15a, and the identification information analysis unit 15b in FIG. 7 are as described above.

  The defect position specifying unit 15 c specifies defect position information in the entire sheet-like product based on the calculation results from the movement amount calculating unit 15 a and the identification information analyzing unit 15 b and the defect position information read from the storage device 9. This is the same function as the defect position specifying unit 10c in FIG. Based on the position information of the defect position stored in the storage device 9, the magic 17a is operated to mark the defect position. After marking, the product can be shipped to the roll 32 in the form of a take-up roll 32.

<Effect>
As described above, the inspection system (inspection method) according to the present invention prints the identification information on the end portion in the width direction of the sheet-like product by the printing device. The identification information is printed and recorded at regular intervals. The defect position information can be stored in the storage device based on this identification information. By comparing the position information stored in the storage device with the current position information of the sheet product to be transferred, the defect position can be specified. Based on this, it is possible to accurately eliminate defective products including defects. As a result, yield reduction can be suppressed.

<Another embodiment>
(1) In the present embodiment, the identification information recording step in FIG. 1, the defect inspection and storage step in FIG. 3, and the single wafer punching step in FIG. 5 are separate and independent steps, but the present invention is not limited to this. . For example, the inspection process and the storage process may be performed immediately after the identification information is recorded.
(2) The identification information is recorded at the end in the width direction of the belt-like sheet product, but may be recorded at both sides in the width direction.

3, 13, 23 Length measuring device 4 Printing device 5 Printing device control unit 6, 16 Reading sensor 7 CCD camera 8 Inspection device 8a, 10a, 15a Movement amount calculation unit 8b, 10b, 15b Identification information analysis unit 8d Defect position calculation unit 9 Storage device 10c, 15c Defect position specifying part N Polarizing plate original fabric

Claims (2)

A storage device in which the position information of the defect is stored in association with the identification information recorded on the end in the width direction by pulling out the belt-like sheet-like product that has been inspected in advance and wound on the roll, An inspection system that performs marking control on a defect position with a marking control device,
The marking control device includes:
A moving amount detecting means for detecting a moving amount in a moving direction of the belt-shaped sheet-shaped product, an identification information reading means for reading the identification information, and position information of the defect read from the storage device,
Based on the detected amount of movement and the read identification information, calculation means for specifying the position of a defect present in the belt-like sheet-like product, and marking means movable along the width direction of the belt-like sheet-like product And having
The distance from the identification information reading means to the line along the width direction in which the marking means moves, the distance along the direction in which the sheet-like product moves, and the identification information are stored in the storage device. An inspection system for a sheet-like product, characterized in that the marking means is operated based on position information of a defect that is present . A storage device in which the position information of the defect is stored in association with the identification information recorded on the end in the width direction by pulling out the belt-like sheet-like product that has been inspected in advance and wound on the roll, An inspection method for performing marking control on a defect position with a marking control device,
The marking control device includes:
A step of detecting the amount of movement in the direction in which the belt-shaped sheet-shaped product moves, a step of reading the identification information by the identification information reading means, position information of the defect read from the storage device,
Based on the detected amount of movement and the read identification information, the step of identifying the position of a defect present in the belt-like sheet-like product and the marking means movable along the width direction of the belt-like sheet-like product Performing the marking process,
The distance from the identification information reading means to the line along the width direction in which the marking means moves, the distance along the direction in which the sheet-like product moves, and the identification information are stored in the storage device. A method for inspecting a sheet-like product , wherein a step of operating the marking means is executed based on position information of a defect that is present .