Web conveying method, web manufacturing method, and web conveying device

Abstract

To provide a transport method of web, a manufacturing method of web, and a transport device of web, where the physical property of transported web can be highly accurately detected or transported web can be processed while conducting web transportation including reeling out of a roller and winding up onto the roller.SOLUTION: The web transport method includes: a detection step where a predetermined physical property of transport web W is detected by a sensor part 12 after the transport web W is reeled out of a roller 10 or before the transport web W is wound up onto the roller 10; or a processing step where a predetermined process is conducted on the transport web W; a positional information acquisition step where the inclination of the transport web W in the side view is detected without contacting the transport web W, and an inclination variation θ is acquired as a positional variation of the transport web W; and a position control step where the position of the sensor part 12 or the processing part is controlled based on the positional variance obtained in the positional information acquisition step.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a web transport method, a web manufacturing method, and a web transport device. [Background technology]

[0002] In the manufacturing process of long media called webs, such as various films, metal foils, papers, and cloths, the web is unwound from a unwound roll and wound up on a winding roll, but it is required that the web be transported at high speed on the transport line without any trouble and that high-precision quality be maintained.

[0003] In the web manufacturing process, sensors are placed on the transport line to control the quality of the transported web (transport web). For example, sensors that measure the charge amount of the transport web and sensors that detect foreign matter and defects are placed on the transport line to understand the physical properties and quality of the sensor web.

[0004] In the web manufacturing process, various processing units are arranged on the conveying line to perform desired processing on the conveying web. For example, a slitting device that slits the conveying web is arranged on the conveying line to cut the periphery of the conveying web.

[0005] In this way, by providing sensors and processing units on the transport line, the physical properties of the transport web can be detected and the transport web can be processed as desired.

[0006] For example, Patent Document 1 discloses an electrostatic potential measuring device that measures the potential of static electricity generated on a sheet-like material. The device is installed near a sheet roll formed by winding a long sheet-like material into a roll and measures the potential of static electricity generated on the sheet-like material, and includes a measuring device that measures the potential of static electricity and a measuring device holding means that is detachable from a machine frame that supports the sheet roll, rolls on the surface of the sheet roll from above, holds the measuring device movably along the axis of the sheet roll at a position a predetermined distance from the surface, and moves up and down in accordance with changes in the outer diameter of the sheet roll. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 05-170369 Summary of the Invention [Problem to be solved by the invention]

[0008] However, when transporting a web that involves unwinding from and winding onto the rollers described above, sensors and processing units are installed on the transport line to detect the physical properties of the transported web and to perform desired processing on the transported web, but there is a problem in that the accuracy is insufficient.

[0009] For example, the electrostatic potential measuring device described in Patent Document 1 measures the potential of static electricity generated on a web, but the measuring device measures not the transport web but a web wound into a roll, so it does not accurately detect the static potential of the transport web (for example, a single layer of the transport web rather than a wound web). Furthermore, this electrostatic potential measuring device is equipped with a measuring device holding means that moves up and down in accordance with changes in the outer diameter of the sheet roll, but because the guide roller is in contact with the surface of the sheet roll, there is a problem in that this affects the quality of the product web.

[0010] When detecting the physical properties of a transport web or performing a desired processing on the transport web, the roll diameter changes from large to small or from small to large as the web is transported, which involves unwinding from a roller or winding onto a roller. As a result, the position of the transport web gradually changes. This position change is particularly noticeable in the transport line section between the unwinding roll or winding roll and the guide roller located nearby.

[0011] However, in conventional web transport technologies, the reality is that no technology has yet been developed that can detect the physical properties of a transport web with high accuracy while taking into full consideration the positional changes of the transport web as described above, or that can process the transport web with high accuracy.

[0012] The present invention has been made in consideration of the above circumstances, and its main object is to provide a web conveying method, a web manufacturing method, and a web conveying device that can detect the physical properties of the conveyed web with high accuracy or process the conveyed web when conveying the web by unwinding it from a roller or winding it onto a roller. [Means for solving the problem]

[0013] As a result of intensive research into achieving the above-mentioned object, the inventor has discovered a method for transporting a web in which the web is unwound from or wound around a roller, which includes a detection step in which a sensor unit detects a predetermined physical property of the transport web after it has been unwound from the roller or before it is wound around the roller, or a processing step in which a processing unit applies a predetermined processing to the transport web, a position information acquisition step in which the inclination of the transport web in a side view is detected without contacting the transport web and the amount of change in inclination is acquired as an amount of position change of the transport web, and a position control step in which the position of the sensor unit or the processing unit is controlled based on the amount of position change acquired in the position information acquisition step, and has thereby completed the present invention.

[0014] That is, the present invention is as follows.

[0015] (1) A method for transporting a web in which the web is unwound from or wound around a roller, the method comprising: a detection step in which a sensor unit detects a predetermined physical property of the transport web after it has been unwound from the roller or before it is wound around the roller; or a processing step in which a processing unit applies a predetermined processing to the transport web; a position information acquisition step in which the inclination of the transport web in a side view is detected without contacting the transport web and the amount of change in the inclination is acquired as the amount of change in position of the transport web; and a position control step in which the position of the sensor unit or the processing unit is controlled based on the amount of change in position acquired in the position information acquisition step. (2) In the web transport method described in (1), the position information acquisition process includes placing at least two focal length measurement units equipped with lenses above or below the web transport line, and each focal length measurement unit acquires the focal length to the surface of the transport web for the transport web, detects the inclination of the transport web from the acquired focal length, and acquires the amount of change in the inclination as the amount of change in the position of the transport web. (3) The position information acquisition process is a web transport method described in (1) or (2), in which at least two position measurement units each having an irradiation unit capable of irradiating an energy ray and a light receiving unit capable of receiving the energy ray are arranged above or below the web transport line, the energy ray is irradiated from the irradiation unit of each position measurement unit toward the surface of the transport web, and the reflected wave of the energy ray reflected from the surface is received by the light receiving unit to acquire the distance to the transport web, the inclination of the web is detected from the acquired distance, and the amount of change in the inclination is acquired as the amount of change in the position of the web. (4) The position information acquisition process is a web transport method described in any one of (1) to (3), in which at least one imaging unit equipped with a lens is arranged above or below the web transport line, the imaging unit captures an image of a predetermined location on the surface of the transport web to acquire an image of the transport web, detects the inclination of the transport web from image blur in the acquired image, and acquires the amount of change in the inclination as the amount of change in the position of the transport web. (5) The position information acquisition process is a web conveying method described in any one of (1) to (4), in which at least one lateral imaging unit is arranged on the side of the web conveying line, and the lateral imaging unit detects the inclination of the web by imaging the conveying web from the side of the conveying web, and acquires the change in the inclination as the position change of the web. (6) A web transport method according to any one of (1) to (5), wherein the position information acquisition process acquires the amount of position change of the transport web in real time, and the position control process controls the position of the sensor unit or the processing unit in real time based on the amount of position change acquired in real time. (7) The web transport method according to any one of (1) to (6), wherein the detection step includes at least one step selected from the group consisting of a step of measuring the charge amount of the transport web using the sensor unit, a step of imaging the surface of the transport web and detecting the presence or absence of foreign matter using the sensor unit that detects adhesion of foreign matter to the surface, a step of imaging the surface of the transport web and detecting the presence or absence of defects using the sensor unit that detects defects on the surface, a step of measuring the coating amount on the surface of the transport web using the sensor unit that measures the coating amount, and a step of detecting the uneven shape of the surface of the transport web using the sensor unit that detects the uneven shape. (8) The web transport method according to any one of (1) to (7), wherein the processing step includes at least one selected from the group consisting of a step of slitting the transport web by the processing unit that cuts the side edges of the transport web, a step of laser processing the transport web by the processing unit that irradiates the transport web with a laser, a step of removing foreign matter from the surface of the transport web by the processing unit that sprays air onto the transport web, a step of sucking and removing foreign matter from the surface of the transport web by the processing unit that sucks air from the surface of the transport web, a step of correcting slack and / or wrinkles in the transport web by the processing unit that has a guide roll mechanism that controls meandering of the transport web, and a step of modifying the surface of the transport web by the processing unit that applies an electric discharge treatment to the surface of the transport web. (9) The method for manufacturing a web includes a payout process in which the web is paid out from the roller or a winding process in which the web is wound up around the roller, and a conveying process in which the web is conveyed by the web conveying method described in any one of (1) to (8). (10) A web conveying device for a web that is unwound from a roller or wound around a roller, comprising: a conveying section that conveys the web; a sensor section that detects a predetermined physical property of the conveying web after it has been unwound from the roller or before it has been wound around the roller, or a processing section that performs a predetermined processing on the conveying web; a position information acquisition section that detects the inclination of the conveying web in a side view after it has been unwound from the roller or before it has been wound around the roller without contacting the conveying web, and acquires the amount of change in the inclination as the amount of change in position of the conveying web; and a position control section that controls the position of the sensor section or the processing section based on the amount of change in position acquired by the position information acquisition section. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a web conveying method, a web manufacturing method, and a web conveying device that can detect the physical properties of the conveyed web with high accuracy or process the conveyed web when conveying the web by unwinding it from a roller or winding it onto a roller. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a side view for explaining a conveying method according to the first embodiment. [Figure 2] FIG. 2 is a top view for explaining the transport method according to the first embodiment. [Figure 3] FIG. 3 is a side view for explaining acquisition of the amount of change in tilt in the first embodiment. [Figure 4] FIG. 4 is a side view illustrating a conveying method according to the second embodiment. [Figure 5] FIG. 5 is a schematic diagram for explaining how to obtain the amount of change in tilt based on an image captured by a camera in the second embodiment. [Figure 6] FIG. 6 is a top view for explaining a transport method according to the third embodiment. [Figure 7] FIG. 7 is a side view for explaining a conveying method according to the third embodiment. [Figure 8] FIG. 8 is a graph plotting the measured distance to the simulated film and the measured charge amount at that time in the payout test. [Figure 9] FIG. 9 is a graph showing the measurement results of the charge amount in the payout test of the example. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The following present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0019] In the drawings, the same elements are given the same reference numerals, and redundant explanations will be omitted. Furthermore, unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the ratios shown in the drawings.

[0020] Furthermore, in this specification, terms with "abbreviation" attached indicate the meaning of the term excluding "abbreviation" within the scope of common technical knowledge of a person skilled in the art, and also include the meaning itself excluding "abbreviation."

[0021] <Web transport method>

[0022] The web transport method according to the present embodiment is a method for transporting a web in which the web is unwound from or wound around a roller, (1) a detection step of detecting a predetermined physical property of a transport web by a sensor unit after unwinding from a roller or before winding onto a roller, or a processing step of performing a predetermined processing on the transport web by a processing unit; (2) a position information acquiring step of detecting the inclination of the transport web in a side view without contacting the transport web and acquiring the amount of change in the inclination as the amount of change in position of the transport web; (3) a position control step of controlling the position of the sensor unit or the processing unit based on the position change amount acquired in the position information acquisition step; A method for transporting a web, comprising:

[0023] Hereinafter, an example of measuring the charge amount as the detection step will be described with reference to the drawings.

[0024] FIG. 1 is a side view for explaining the conveying method according to the first embodiment, FIG. 2 is a top view for explaining the conveying method according to the first embodiment, and FIG. 3 is a side view for explaining the acquisition of the amount of change in inclination in the first embodiment.

[0025] 1 is a method for transporting a web W that is unwound from or wound around a roller 10, and measures the charge amount of the transported web (transport web) W. In this specification, the term "web W" may be used to encompass both the web that is wound around the roller 10 (the web of the roll bodies R1 and R2) and the transport web (the web that is not wound around the roller 10 and is transported on the transport line).

[0026] The conveying device 1 includes a roller 10 around which the web W is wound, and a guide roller 11. A sensor unit 12 for measuring the charge amount of the conveyed web W is disposed above the conveying line (above in FIG. 1), and a first focal length measurement unit 13 is disposed on the roller 10 side, and a second focal length measurement unit 14 is disposed on the guide roller 11 side. Unless otherwise specified, "above (the conveying line)" refers to the upper side of the conveying line as viewed from the side (see, for example, FIG. 1). Unless otherwise specified, "below (the conveying line)" refers to the lower side of the conveying line as viewed from the side (see, for example, FIG. 1).

[0027] For example, when a web W is wound around a roller (sometimes called a winding shaft in this case) 10, the web W is transported from a guide roller 11 toward the roller 10 (see arrow F1). In this case, the roll diameter of the roll body with the web W wound around the roller 10 gradually increases from a small diameter (see roll body R1) to a large diameter (see roll body R2). Accordingly, the position of the transported web W also gradually moves from a lower position (see transported web W1) to an upper position (see transported web W2).

[0028] On the other hand, when the web W is unwound from the roller (sometimes called a unwinding shaft in this case) 10, the web W is transported from the roller 10 toward the guide roller 11 (see arrow F2). In this case, the roll diameter of the roll from which the web W is unwound gradually decreases from a large diameter (see roll R2) to a small diameter (see roll R1). Accordingly, the position of the transported web W also gradually moves from an upper position (see transported web W2) to a lower position (see transported web W1).

[0029] In this way, the position of the transported web W changes both when the web W is unwound from the roller 10 and when the web W is wound around the roller 10. According to this embodiment, by acquiring the amount of change in tilt θ as the amount of position change, it is possible to accurately and easily grasp the change in position of the transported web W. Furthermore, because the amount of change in tilt θ can be acquired without contact, there is no adverse effect on the transport line or the product web.

[0030] (Detection process)

[0031] The conveying method according to the first embodiment includes a detection step (1) in which the sensor unit 12 measures the charge amount of the conveyed web W after it has been unwound from the roller 10 or before it is wound onto the roller 10. Here, as an example, the case where the charge amount is measured as a physical property of the web W is illustrated, but the sensor unit 12 may also detect other physical properties. For example, the sensor unit 12 can detect the presence or absence of dust or defects, thickness, refractive index, surface waviness, etc. The surface waviness here refers to the occurrence of unintended fine irregularities on the surface, etc. The physical property detected by the sensor unit 12 does not have to be only one of these, and it may detect two or more of these simultaneously or at different times with a time lag.

[0032] The sensor unit 12 includes a charge amount measuring sensor 120 that measures the charge amount, a front-rear moving unit 121 that moves the charge amount measuring sensor 120 back and forth (see arrow F3), and a rotation moving unit 122 that rotates the charge amount measuring sensor 120 in the conveying direction (see arrow F4). This allows the sensor unit 12 to move in any direction, up, down, left, or right, relative to the conveyed web W.

[0033] The sensor unit 12 may be configured to measure the amount of charge at any one point on the transport web W, or may be configured to measure the amount of charge at any width position on the transport web W by making the sensor unit 12 movable in the width direction of the transport web W when viewed from above (see the vertical direction on the paper in Figure 1, the up and down direction in Figure 2).

[0034] When measuring the transport web W after it has been unwound from the roller (unwinding shaft) 10, it is preferable to perform the measurement using the sensor unit 12 immediately after unwinding. Specifically, "immediately after unwinding" means that the transport web W is more preferably measured using the sensor unit 12 at a location located 50 mm to 2000 mm from the central axis of the roller 10 on the transport line, even more preferably at a location 100 mm to 600 mm, and even more preferably at a location 200 mm to 500 mm. This allows the characteristics of the web W, foreign matter, static electricity, and the like to be measured and / or detected with high accuracy without being affected by the roller 10 or the guide roller 11.

[0035] Similarly, when measuring the transport web W before it is wound onto the roller (winding shaft) 10, it is preferable to perform the measurement with the sensor unit 12 immediately before winding. Specifically, "immediately before winding" means that the transport web W is preferably measured with the sensor unit 12 at a location on the transport line that is 50 mm to 2000 mm from the central axis of the roller 10, more preferably at a location that is 100 mm to 600 mm, and even more preferably at a location that is 200 mm to 500 mm. This allows the characteristics of the web W, foreign matter, static electricity, etc. to be accurately measured and / or detected without being affected by the roller 10 or the guide roller 11.

[0036] (Location information acquisition process)

[0037] Next, (2) a position information acquisition process is performed in which the inclination of the transport web W in a side view is detected without contacting the transport web W after it has been unwound from the roller 10 or before it is wound onto the roller 10, and the change in inclination θ is acquired as the position change amount of the transport web W.

[0038] The amount of change in inclination θ here refers to the difference between the inclination of the web W1 at a specific point in time during transport and the inclination of the web W2 at a point in time after a predetermined time has elapsed from that point.

[0039] The inclination of the transport web W1 at the specific time point may be, for example, the inclination of the transport web W1 relative to the horizontal direction in a side view of the transport line (see, for example, FIG. 1). Alternatively, a predetermined direction (for example, the inclination of the transport line at the start of transport) may be used as a reference line in a side view of the transport line (see, for example, FIG. 1), and the inclination of the transport web W1 relative to this may be used as the "inclination."

[0040] Similarly, the inclination of the transport web W2 after the predetermined time has elapsed may be defined as the inclination of the transport web W2 relative to the horizontal direction in a side view of the transport line. Alternatively, a predetermined direction (for example, the inclination of the transport line at the start of transport) in a side view of the transport line (see, for example, FIG. 1) may be used as a reference line, and the inclination of the transport web W2 relative to this may be defined as the "inclination."

[0041] In this embodiment, it is sufficient to obtain the amount of change θ in the inclination of the transport web W in a side view, and it is not necessary to calculate the specific inclination angle of the inclination at each point in time. In other words, in this embodiment, it is sufficient to detect the inclination of the transport web W in a side view as described above, and it is not necessary to calculate the specific inclination angle.

[0042] In the position information acquisition process, at least two first focal length measurement units 13 and two second focal length measurement units 14 equipped with lenses are arranged above (see the top of Figure 1) or below (see the bottom of Figure 1) the conveying line of the conveying web W, and it is preferable that each of the first focal length measurement unit 13 and the second focal length measurement unit 14 acquires the focal length to the surface of the conveying web W for the conveying web W, detects the inclination of the conveying web W from the acquired focal length, and acquires the change in inclination θ as the position change amount of the conveying web W.

[0043] An example of a method for detecting the inclination of the transported web W from the focal length will be described with reference to FIG.

[0044] 3 illustrates an example in which focal length measurement units 13 and 14 are provided in two locations, but in this embodiment, the number of locations is not limited to two and they may be provided in three or more locations. By increasing the number of locations, the amount of change in tilt θ can be calculated with higher accuracy, and the position of sensor unit 12 can be controlled with higher accuracy.

[0045] For example, when web W1 is wound around roller 10, first focal length measurement unit 13 measures focal length a for web W1 (see arrow F5 in FIG. 1), and second focal length measurement unit 14 measures focal length c for web W1 (see arrow F6 in FIG. 1). After a predetermined time has passed and web W2 has been further wound, first focal length measurement unit 13 measures focal length b for web W2 (see arrow F5 in FIG. 1), and second focal length measurement unit 14 measures focal length d for web W2 (see arrow F6 in FIG. 1). The amount of change θ in tilt is calculated from the focal lengths a, b, c, and d thus obtained, as well as the distance between first focal length measurement unit 13 and second focal length measurement unit 14, etc.

[0046] Alternatively, when web W2 is unwound from roller 10, first focal length measurement unit 13 measures focal length b for web W2 (see arrow F5 in FIG. 1), and second focal length measurement unit 14 measures focal length d for web W2 (see arrow F6 in FIG. 1). After a predetermined time has elapsed, when web W1 is unwound, first focal length measurement unit 13 measures focal length a for web W1 (see arrow F5 in FIG. 1), and second focal length measurement unit 14 measures focal length c for web W1 (see arrow F6 in FIG. 1). The amount of change θ in tilt is calculated from the focal lengths a, b, c, and d thus obtained, as well as the distance between first focal length measurement unit 13 and second focal length measurement unit 14, etc.

[0047] 2, the first focal length measurement unit 13 and the second focal length measurement unit 14 are preferably provided on the side edges (edge ​​lines) of the conveyance line of the web W when viewed from above. This allows for more accurate measurement of the focal length.

[0048] Although not shown, according to this embodiment, instead of the above-described first focal length measurement unit 13 and second focal length measurement unit 14, a first irradiation unit and a second irradiation unit that irradiate the web W with an energy beam such as a laser beam may be provided, and the distance from the web W to each of the first irradiation unit and the second irradiation unit may be obtained, and the amount of change in tilt θ may be obtained from these distances. Similar to the focal length measurement units 13 and 14, the irradiation units may be provided at two or more locations on the conveying line.

[0049] When the amount of change in tilt θ is obtained using an irradiation unit, the position information acquisition process preferably involves arranging at least two position measurement units above or below the conveying line of the web W, each equipped with an irradiation unit capable of irradiating energy rays and a light-receiving unit capable of receiving the energy rays, irradiating the conveying web W from the irradiation unit of each position measurement unit (for example, the first irradiation unit and the second irradiation unit described above) toward the surface of the conveying web W (see arrows F5 and F6 in Figure 1), and receiving the reflected wave of the energy rays reflected from the surface with the light-receiving unit (see the opposite direction of arrow F5 and the opposite direction of arrow F6 in Figure 1), thereby obtaining distances a, b, c, and d to the conveying web W, calculating the amount of change in tilt θ of the web W from the obtained distances a, b, c, and d, and the placement distance between the first focal length measurement unit 13 and the second focal length measurement unit 14, and obtaining the amount of change in tilt θ as the amount of change in position of the web W.

[0050] (Position control process)

[0051] Then, (3) a position control step is performed in which the position of the sensor unit 12 is controlled based on the amount of position change acquired in the position information acquisition step.

[0052] The position of the sensor unit 12 is preferably controlled so that the distance between the sensor unit 12 and the transport web W is maintained at a constant value. The position of the sensor unit 12 can be controlled by an actuator or the like. In the first embodiment, the position of the sensor unit 12 can be controlled with high precision by the forward / backward movement unit 121 and the rotational movement unit 122 provided in the sensor unit 12. For example, the position can be controlled by an actuator or the like so that a predetermined distance is always maintained in accordance with the positional change of the transport web W during transport. By controlling the position in this manner, the sensor unit 12 can be moved in accordance with the positional change of the transport web W during transport, and therefore the physical properties of the transport web W can be detected with high precision.

[0053] The outer diameter (diameter) of the roller 10 is not particularly limited, but is preferably 3 inches or more and 10 inches or less. According to this embodiment, even when a roller 10 with such an outer diameter is used, it is possible to maintain a constant distance between the sensor unit 12 and the transport web W, and therefore the physical properties of the transport web W can be detected with high accuracy.

[0054] Furthermore, the conveying speed of the conveying line is not particularly limited, but is preferably 1 m / min or more and 2000 m / min or less. When the conveying speed is relatively high, defects in the conveyed web W are more likely to occur during conveyance. However, according to the present embodiment, defects in the web W can be detected with high accuracy, and therefore defects in the manufacturing process can be effectively prevented.

[0055] Furthermore, the web W has a long, substantially rectangular shape and is sometimes called a sheet, a film, etc. The material of the web W is not particularly limited, but examples thereof include resins (polyethylene terephthalate, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyethylene naphthalate, polyamide films such as 6,6-nylon, polycarbonate films, polyacrylonitrile films, engineering plastic films such as polyimide films, etc.), paper (glassine paper, wood-free paper, coated paper, cast-coated paper, etc.), and cloth (nonwoven fabric, etc.).

[0056] According to this embodiment, real-time monitoring is preferable. Specifically, it is more preferable that the position information acquisition step acquires the amount of position change of the transport web W in real time, and the position control step controls the position of the sensor unit 12 in real time based on the amount of position change of the transport web W acquired in real time. When processing is performed by a processing unit (described later), it is more preferable to control the position of the processing unit in real time based on the amount of position change of the transport web W acquired in real time, as in the case of using the sensor unit 12.

[0057] As described above, according to this embodiment, the sensor unit 12 can be moved to follow the positional change of the transport web W during transport, and the position of the sensor unit 12 can be adjusted in real time in the position control step based on the amount of position change acquired in real time in the position information acquisition step. As a result, the state of the transport web W can be continuously monitored by the sensor unit 12 without stopping the transport line.

[0058] By continuously monitoring in real time, sensing by the sensor unit 12 (for example, detecting changes over time in various physical properties such as the amount of charge, and quickly detecting foreign matter and defects) can be performed in real time while the conveying line is running. In particular, according to this embodiment, sensing can be performed without contacting the conveying web W, so that highly accurate real-time sensing can be performed without stopping the conveying line. Therefore, the manufacturing method also has the advantage of high yield and excellent manufacturing efficiency.

[0059] FIG. 4 is a side view illustrating a conveying method according to the second embodiment, and FIG. 5 is a schematic diagram illustrating acquisition of the amount of change in tilt based on an image captured by a camera in the second embodiment.

[0060] In the transport method according to the second embodiment, the transport web W is imaged from above, and distance measurement is performed using the state of image blur in the captured image, thereby detecting the amount of change θ in the inclination of the transport web W.

[0061] The conveying device 2 includes a roller 10 around which the web W is wound, and a guide roller 11. A sensor unit 12 for measuring the charge amount of the conveyed web W is disposed above the conveying line (above in FIG. 4), and an imaging unit 15 is disposed on the roller 10 side.

[0062] In the position information acquisition process in the second embodiment, at least one imaging unit 15 equipped with a lens is arranged above or below the conveying line of the conveying web W, and the imaging unit 15 captures an image of a predetermined location on the surface of the conveying web W (see arrow F7 in Figure 4) to acquire an image 150.The inclination of the conveying web W is detected from the image blur of the acquired image 150, and the change in this inclination θ can be acquired as the position change of the conveying web W.

[0063] For example, when the web W1 is wound around the roller 10, the imaging unit 15 captures an image of a predetermined portion of the transport web W to obtain a captured image 150 (see arrow F7 in FIG. 4 and FIG. 5). If the transport web W1 is not horizontal with respect to the lens of the imaging unit 15 (i.e., if the transport web W is tilted with respect to the lens of the imaging unit 15), the captured image 150 will be blurred. For example, in FIG. 5, the right-hand region A1 of the captured image 150 is clear with little blur, while the left-hand region A2 is significantly blurred. Thus, the degree of image blur can be used to calculate the distance between the right-hand region A1 and the imaging unit 15 and the distance between the left-hand region A2 and the imaging unit 15, thereby detecting the tilt of the transport web W at the time of capturing the image.

[0064] Then, after a predetermined time has elapsed, the imaging unit 15 similarly captures an image of a predetermined location on the transport web W2 to obtain an image 150 (see arrow F7 in Figure 4 and Figure 5), and the inclination of the transport web W2 at the time of capture is detected.

[0065] In this way, the difference between the inclination of the transport web W1 at a specific time during transport and the inclination of the transport web W2 at a time a predetermined time after that time is calculated to obtain the amount of change θ in the inclination.

[0066] When unwinding web W2 from roller 10, the inclination of webs W2 and W1 is obtained at at least two points in time, in the same manner as when winding web W1 onto roller 10, and the difference between these values ​​is taken to obtain the change in inclination θ.

[0067] As a method for detecting tilt using image blur in the captured image 150, for example, the distance can be calculated based on the brightness value, size, color, etc. of the image blur. Taking brightness values ​​as an example, the distance can be calculated based on a calibration curve obtained from the relationship between the brightness value of the image and the actual distance. For example, the actual distance between the camera and the vicinity of the end of the web W and the brightness value profile from the surface of the web W near the end of the web W to a point outside the web W are determined, and a calibration curve is created based on these. In actual operation, the distance can be calculated by comparing the brightness value profile near the end of the web W captured by the camera with the calibration curve created using the above method.

[0068] The imaging unit 15 may be any camera equipped with a lens and capable of capturing images. While not particularly limited, it is preferable to use, for example, a stereo camera or a monocular camera. A stereo camera is more preferable because it can measure distances passively without emitting radio waves or light, minimizes errors due to interference between devices, and is less dependent on the object because it does not require pattern recognition using a database. For example, an estimated distance may be obtained using deep learning based on pre-collected image data, and tilt may be detected from this estimated distance. With such a deep learning method, even when using a monocular camera, the estimated distance can be obtained with the same level of accuracy as a compound camera. Furthermore, a distance estimation algorithm may be constructed from pre-collected image data, and by combining this algorithm during actual use, the estimated distance may be obtained with higher accuracy and tilt may be detected.

[0069] For example, when capturing the captured image 150 in real time, the area of ​​image blur in the captured image 150 is narrow and the degree of image blur is small at first, but as the transport progresses the degree of image blur increases (or vice versa), and so on, and the above-mentioned amount of change in tilt θ can be acquired in real time. For example, a phenomenon can be utilized in which the image is in focus at the start of transport but becomes out of focus as the transport progresses (or vice versa).

[0070] According to the second embodiment, it is sufficient to install at least one imaging unit 15 on the conveying line. The installation position of the imaging unit 15 is not particularly limited, but from the viewpoint of detecting the positional change of the sensor unit 12 with high accuracy, it is preferable to install the imaging unit 15 near the sensor unit 12 in the conveying direction.

[0071] FIG. 6 is a top view for explaining the transfer method according to the third embodiment, and FIG. 7 is a side view for explaining the transfer method according to the third embodiment.

[0072] In the transport method according to the third embodiment, the transport web W is imaged from the side, the tilt angle of the transport web W when viewed from the side is obtained, and the amount of change θ in the tilt of the transport web W is thereby detected.

[0073] The conveying device 3 includes a roller 10 around which the web W is wound, and a guide roller 11. A sensor unit 12 that measures the charge amount of the conveyed web W is disposed above the conveying line (above in FIG. 7), and a side imaging unit 16 is disposed to the side of the conveying line for the conveyed web W (see FIG. 6).

[0074] In the position information acquisition process in the third embodiment, at least one lateral imaging unit 16 is arranged on the side of the conveying line of the web W, and the lateral imaging unit 16 detects the inclination of the conveying web W by imaging the conveying web W from the side of the conveying web W (see arrow F8), and the change in this inclination θ can be acquired as the position change amount of the conveying web W.

[0075] The amount of change in inclination θ here refers to the difference between the inclination of the web W1 at a specific point in time during transport and the inclination of the web W2 at a point in time after a predetermined time has elapsed from that point.

[0076] The inclination of the transport web W1 at the specific time point may be, for example, the inclination of the transport web W1 relative to the horizontal in a side view of the transport line (see, for example, FIG. 7). Alternatively, a predetermined direction in a side view of the transport line (for example, the inclination of the transport line at the start of transport) may be used as a reference line, and the inclination of the transport web W1 relative to this reference line may be used as the "inclination." In either case, the side imaging unit 16 (see FIG. 6) may capture an image of a predetermined location of the transport web W1 to obtain an image (side image, see FIG. 7), and the inclination of the transport web W1 can be detected.

[0077] Similarly, the inclination of the transport web W2 after the predetermined time has elapsed may be determined by the inclination of the transport web W2 relative to the horizontal in a side view of the transport line. Alternatively, a predetermined direction (e.g., the inclination of the transport line at the start of transport) in a side view of the transport line (e.g., see FIG. 7) may be used as a reference line, and the inclination of the transport web W2 relative to this reference line may be determined by the inclination of the transport web W2. In either case, the side imaging unit 16 (see FIG. 6) may capture an image of a predetermined location on the transport web W2 to obtain an image (side image, see FIG. 7), and the inclination of the transport web W2 can be detected.

[0078] In this embodiment, it is sufficient to obtain the amount of change θ in the inclination of the transport web W in a side view, and it is not necessary to calculate the specific inclination angle of the inclination at each point in time. In other words, in this embodiment, it is sufficient to detect the inclination of the transport web W in a side view as described above, and it is not necessary to calculate the specific inclination angle.

[0079] Whether winding web W1 onto roller 10 or unwinding web W2 from roller 10, the inclination of the transported web W is detected at at least two points in time, and the difference between these values ​​is taken to obtain the change in inclination θ.

[0080] The lateral imaging unit 16 can be a camera capable of detecting the tilt of the transport web W. While not particularly limited, it is preferable to use, for example, a stereo camera or a monocular camera. A stereo camera is more preferable because it can measure distances passively without emitting radio waves or light, minimizes errors due to interference between devices, and does not require pattern recognition using a database, resulting in low object dependency. For example, when detecting the tilt of the transport web W based on the image captured by the lateral imaging unit 16, this can be done in accordance with the method of detecting the tilt based on the image 150 captured from above by the imaging unit 15, as described in the second embodiment. For example, the tilt can be estimated by deep learning based on previously collected image data, and this estimated tilt can be used. With such a deep learning method, even when using a monocular camera, the tilt can be obtained with the same accuracy as a compound camera. Alternatively, an algorithm for detecting the tilt can be constructed from previously collected image data, and this algorithm can be combined with the algorithm during actual use to detect the tilt with higher accuracy.

[0081] According to the third embodiment, at least one side image capturing unit 16 may be installed on the side of the conveying line. The installation position of the side image capturing unit 16 is not particularly limited, but it is preferable to install the side image capturing unit 16 near the sensor unit 12 in the conveying direction from the viewpoint of detecting a change in the position of the sensor unit 12 with high accuracy.

[0082] In the first to third embodiments described above, the detection step is exemplified as measuring the charge amount of the web W by the sensor unit 12, but is not limited thereto. In the present embodiment, various detection steps, various processing steps, or both can be performed.

[0083] The detection process that can be performed in this embodiment is, for example, (a) a step of measuring the charge amount of the transport web W by the sensor unit 12 described above; (a) a step of capturing an image of the surface of the transport web W using a camera or the like, and detecting the presence or absence of foreign matter using a sensor unit 12 capable of detecting adhesion of foreign matter to the surface of the transport web W; and (c) a step of capturing an image of the surface of the transport web W using a camera or the like, and detecting the presence or absence of defects using a sensor unit 12 capable of detecting defects on the surface of the transport web W; (iv) measuring the coating amount on the surface of the transport web W by a sensor unit 12; and (e) a step of detecting the uneven shape of the surface of the transport web W by a sensor unit 12 that detects the uneven shape of the surface of the transport web W; The configuration may be such that at least one selected from the group consisting of:

[0084] A case will be described in which the charge amount of the transported web W is measured by the sensor unit 12, as in the first embodiment. The web W becomes charged as it is transported. If the web W becomes charged, static electricity may be generated on the web W, or dust or other particles may adhere to the surface of the web W, causing transport problems. Therefore, it is necessary to grasp the charge amount of the web W (e.g., charge potential, charge amount, etc.) on the production line and perform an appropriate charge removal process. In this regard, the transport method according to this embodiment can measure the charge amount of the web W with high accuracy, allowing appropriate charge removal processes to be performed. In this case, by controlling the position of the sensor unit 12 so that the positional relationship with the web W is kept constant based on the amount of position change acquired in the position information acquisition process, the true charge amount can be measured with high accuracy, regardless of the winding diameter.

[0085] (A) A case will be described in which the presence or absence of foreign matter is detected by a sensor unit 12 capable of capturing an image of the surface of the transport web W using a camera or the like and detecting the adhesion of foreign matter to the surface of the transport web W. Foreign matter such as dust, dirt, particles, insects, or human skin adhering to the transport web W contaminates the transport web W and causes product defects. Such foreign matter may be generated, for example, during web processing (such as slit residue), due to wear or deterioration of the rubber components of the rubber roller, or due to airborne dust adhering to the transport web W. Therefore, if foreign matter adheres to the transport web W in a production line, appropriate dust removal treatment must be performed. In this regard, the transport method according to this embodiment can detect the presence or absence of foreign matter adhering to the transport web W with high accuracy, allowing for appropriate dust removal treatment using a web cleaner, dust removal device, or the like. The foreign matter to be detected may be, for example, at least one selected from the group consisting of dust, dirt, particles, insects, and human skin. In this case, by controlling the position of the sensor unit 12 to maintain a constant positional relationship with the web W based on the amount of position change acquired in the position information acquisition process, foreign matter can always be detected under the same conditions, regardless of the winding diameter.

[0086] (c) A case will be described in which the surface of the transport web W is imaged using a camera or the like, and the presence or absence of defects is detected using a sensor unit 12 capable of detecting defects on the surface of the transport web W. Defects such as pinholes, folds, wrinkles, sagging, slips, skew, scratches, abrasions, air bubbles, and color unevenness may occur during transport of the transport web W, resulting in product defects. Therefore, when a defect occurs in the transport web W on a production line, it is necessary to quickly detect the defect and control transport conditions such as the transport speed. In this regard, the transport method according to this embodiment allows for rapid detection of defects in the transport web W with high accuracy, thereby enabling appropriate web handling. The defect to be detected may be at least one selected from the group consisting of pinholes, folds, wrinkles, sagging, slips, skew, scratches, abrasions, air bubbles, and color unevenness. In this case, by controlling the position of the sensor unit 12 so that its positional relationship with the web W is constant based on the amount of position change acquired in the position information acquisition process, defects can be detected under the same conditions regardless of the winding diameter.

[0087] (D) A case where the coating amount is measured by the sensor unit 12 that measures the coating amount on the surface of the transport web W will be described. For example, if the transport web W is a resin substrate, it is coated with an ink-receiving layer that is provided for purposes such as printing. The transport method according to this embodiment makes it possible to measure the coating amount with high accuracy. In this case, the position of the sensor unit 12 is controlled based on the amount of position change acquired in the position information acquisition step so that foreign matter is always detected under the same conditions, regardless of the reel diameter. This makes it possible to always measure the coating amount of the coating layer under the same conditions, regardless of the reel diameter. Furthermore, the coating amount information thus acquired may be used to control the coating conditions, such as the coating amount, of a coating device (not shown).

[0088] (E) A case where unevenness is detected by a sensor unit 12 that detects unevenness on the surface of a transported web W will be described. When processing the web surface, unevenness of a certain level can lead to defects. The transport method according to this embodiment makes it possible to detect unevenness with high accuracy. In this case, by controlling the position of the sensor unit 12 so that its positional relationship with the web W is kept constant based on the amount of position change acquired in the position information acquisition process, it is possible to always detect unevenness under the same conditions, regardless of the winding diameter.

[0089] Examples of processing steps that can be performed in this embodiment include: (f) a step of slitting the transport web W by a processing unit that cuts the side edges of the transport web W; (g) a step of performing laser processing on the transport web (W) by a processing unit that irradiates the transport web (W) with a laser; and (h) a process of removing foreign matter from the surface of the transport web W by a processing unit that sprays air onto the transport web W; (i) a step of sucking and removing foreign matter from the surface of the transport web W by a processing unit that sucks air from the surface of the transport web W; (J) a step of correcting slack and / or wrinkles in the transport web W by a processing unit having a guide roll mechanism that controls meandering of the transport web W; and (k) A process of modifying the surface of the transport web (W) by a processing unit that applies an electric discharge treatment to the surface of the transport web (W); The configuration may be such that at least one selected from the group consisting of:

[0090] (F) A case where a conveying web W is slit using a processing unit that cuts the side edges of the conveying web W will be described. For example, a slitter device is provided on the conveying line of the web W, and the side edges of the conveying web W are cut along the conveying direction to process the web W to a desired width. When performing such slitting, high accuracy in the dimensional shape of the processed product is desired. In this regard, according to the conveying method of this embodiment, the amount of position change is acquired in the position information acquisition step, and this makes it possible to accurately grasp the amount of position change associated with the conveyance of the conveying web W, thereby enabling slitting with high accuracy. For example, even fine shapes can be processed accurately.

[0091] (G) A case where laser processing is performed on the transport web W by a processing unit that irradiates the transport web W with a laser will be described. For example, by providing a laser processing unit (not shown) equipped with a light source that can perform laser processing by irradiating the transport web W with a laser, the desired processing can be performed on the transport web W. In this regard, according to the transport method of this embodiment, the amount of position change is acquired in the position information acquisition step, and this makes it possible to accurately grasp the amount of position change associated with the transport of the transport web W, so that laser processing can be performed with high precision. For example, even fine shapes can be processed accurately.

[0092] (H) A case will be described in which foreign matter is removed from the surface of the transport web W by a processing unit that sprays air onto the transport web W. By spraying air onto the transport web W, foreign matter adhering to the surface of the transport web W can be blown away. This makes it possible to remove foreign matter from the surface of the transport web. In this case, for example, a nozzle or blow unit capable of ejecting air is installed near the top or bottom of the transport web W. In this regard, according to the transport method of this embodiment, the amount of position change is acquired in the position information acquisition step, and the amount of position change associated with the transport of the transport web W can be accurately determined. Therefore, air can be always blown onto the web W under the same conditions regardless of the winding diameter, and foreign matter can be removed thoroughly along the entire length of the transport web W.

[0093] (i) A case will be described in which foreign matter is sucked and removed from the surface of the transport web W by a processed section that sucks air from the surface of the transport web W. By sucking air from the surface of the transport web W, foreign matter adhering to the surface of the transport web W can be sucked out. This makes it possible to remove foreign matter from the surface of the transport web. In this case, for example, a suction device is installed near the top or bottom of the transport web W. In this regard, according to the transport method of this embodiment, the amount of position change is acquired in the position information acquisition step, and this makes it possible to accurately grasp the amount of position change associated with the transport of the transport web W. Therefore, foreign matter can be always sucked from the transport web W under the same conditions regardless of the winding diameter, and therefore, foreign matter can be removed without omission.

[0094] (J) A case will be described in which slack and / or wrinkles in the transport web W are corrected using a processing unit equipped with a guide roll mechanism that controls the meandering of the transport web W. By installing a guide roll mechanism that controls the meandering of the transport web W, slack and wrinkles in the transport web W caused by transport can be corrected. In this case, for example, a device that detects the meandering state of the transport web W is installed. In this regard, according to the transport method of this embodiment, the amount of position change is acquired in the position information acquisition step, and the amount of position change associated with transport of the transport web W can be accurately determined. Therefore, the meandering of the transport web W can be detected under the same conditions at all times, regardless of the winding diameter, and slack and wrinkles can be corrected accurately and without omission.

[0095] (K) A case where the surface of the transport web W is modified by a processing unit that applies an electric discharge treatment to the surface of the transport web W will be described. For example, when modifying the surface of the transport web W to improve its wettability, the surface of the transport web W can be modified to improve its adhesion to other materials by applying an electric discharge treatment to the surface of the transport web W. In this case, for example, an electric discharge treatment device is installed. This makes it possible to accurately grasp the amount of positional change of the transport web W as it is transported, so that the electric discharge treatment can always be applied to the transport web W under the same conditions regardless of the winding diameter. Examples of electric discharge treatment include corona discharge and plasma treatment.

[0096] <Web manufacturing method>

[0097] According to this embodiment, a method for manufacturing web W can be provided, which includes a payout process in which web W is paid out from roller 10, or a winding process in which web W is wound around roller 10, and a transport process in which web W is transported by the above-mentioned web W transport method.

[0098] In addition to the above steps, the manufacturing method according to this embodiment may further include known steps that are performed in the manufacture of the web W. According to the manufacturing method according to this embodiment, the various advantages obtained in the above-described method for transporting the web W can be reflected in the quality of the product web.

[0099] <Web transport device>

[0100] According to this embodiment, it is possible to provide a transport device for the web W that implements the above-described method for transporting the web W.

[0101] For example, a conveying device for a web W that is unwound from or wound around a roller 10, a conveying unit (not shown) that conveys the web W; a sensor unit 12 that detects a predetermined physical property of the transport web W after it has been unwound from the rollers 10 or before it is wound around the rollers 10, or a processing unit (not shown) that performs a predetermined processing on the transport web W; a position information acquisition unit that detects the inclination of the transport web W in a side view without contacting the transport web W after it has been unwound from the roller 10 or before it is wound onto the roller 10, and acquires the amount of change θ in the inclination as the amount of change in position of the transport web W; a position control unit that controls the position of the sensor unit 12 or the processing unit (not shown) based on the amount of position change acquired by the position information acquisition unit; The conveying device 1 for the web W may include the above (see, for example, FIG. 1).

[0102] Although not shown, the conveying unit may be any known means capable of driving the conveying line. For example, in the case of the first embodiment of the conveying method described above, a drive roller or the like capable of driving the conveying line may be used as the conveying unit. Furthermore, the manufacturing apparatus according to this embodiment may also appropriately employ the details described in the second and third embodiments of the conveying method described above.

[0103] As the sensor unit 12, as described above, the sensor unit 12 used in the detection steps (A) to (E) can be used. For example, (A) when measuring the charge amount, a static electricity measuring device using a surface potential sensor can be used. (B) when detecting foreign matter, a foreign matter / defect inspection device capable of detecting foreign matter using captured images can be used. (C) when detecting defects, a foreign matter / defect inspection device capable of detecting defects using captured images can be used. (D) when measuring the coating amount, an in-line film thickness measuring device using spectral interference can be used. (E) when detecting uneven shapes, a sensor that detects a light source and the received light intensity of reflected light from the light source can be used.

[0104] Furthermore, as described above, the processing units used in the processing steps (f) to (k) can be employed. For example, when performing (f) slitting, a slitter device or the like capable of cutting the side edges of the transport web W can be employed. When performing (g) laser processing, a laser irradiation unit capable of irradiating the transport web W with laser can be employed. When performing (h) air injection on the transport web W, a non-contact foreign matter removal device capable of injecting air across the entire width or locally onto the transport web W can be employed. When performing (i) air suction on the transport web W, a non-contact foreign matter removal device capable of injecting air across the entire width or locally onto the transport web W can be employed. When controlling meandering of the transport web W, a meandering prevention device (such as an EPC (Edge Position Control) device or a CPC (Center Position Control) device) capable of correcting deviation of the transport web W from a reference position can be employed. When performing (k) surface modification on the transport web W, a corona treatment device that increases the activity of the web surface by corona discharge, or a plasma treatment device that increases the activity of the web surface by plasma treatment, can be employed. These processed portions described above may be used in combination with the sensor portion 12 or may be used independently.

[0105] As described above, according to this embodiment, the above-mentioned position information acquisition process acquires the amount of change in the inclination of the transport web in a non-contact manner, making it possible to grasp the position change of the web (transport web) being transported on the line in real time with high accuracy. The position of the sensor unit or processing unit is controlled based on the position change of the transport web obtained in this manner, so that the physical properties of the transport web can be detected with high accuracy by the sensor unit, or a predetermined processing can be performed on the transport web with high accuracy. Furthermore, since the transport method according to this embodiment can acquire the amount of change in inclination in a non-contact manner, it does not adversely affect the transport line or the product web.

[0106] Furthermore, according to this embodiment, a detection process for detecting predetermined physical properties of the web (e.g., the amount of charge on the web, the presence or absence of foreign matter or defects, the amount of coating on the surface of the web, the uneven shape, etc.), a processing process for performing predetermined processing on the web (e.g., slitting, laser processing, removal of foreign matter from the surface, correction of slack or wrinkles in the web, surface modification of the web, etc.), or both, can be employed. In both the detection process and the processing process, the positions of the sensor unit and the processing unit can be controlled based on the amount of change in position information of the transport web acquired in the position information acquisition process described above, resulting in high detection accuracy and processing accuracy.

[0107] Furthermore, according to this embodiment, since the amount of change in the position of the transported web can be obtained continuously and non-contactly, the ever-changing amount of change in position can be fed back to the position control unit of the sensor unit or the processing unit, thereby enabling real-time position control of the sensor unit or the processing unit. As a result, the sensor unit or the processing unit can be controlled to always maintain a constant distance from the transport line. Therefore, this embodiment can detect the physical properties of the transported web with high accuracy in real time, or can also process the transported web. [Example]

[0108] The present invention will be explained in more detail by the following examples, but the present invention is not limited to these examples in any way.

[0109] First, in the unwinding test, the charge amount was measured while changing the measurement distance to the web, and the extent to which the charge amount fluctuated due to the positional fluctuation of the transport web caused by unwinding the web was verified (see reference example).

[0110] Next, using the transport device 1 shown in FIG. 1, the web W was unwound from the roll R, and the charge amount of the transported web W was measured in real time, and the accuracy of the measurement was verified (see Examples).

[0111] <Reference example>

[0112] First, a polyethylene terephthalate film (PET, "Lumirror (trademark) T-60", 50 μm thick, manufactured by Toray Industries, Inc.) was prepared as a simulated film for the transport web. Then, a charge amount measuring instrument ("APB-01", manufactured by Harada Corporation) was used to measure the charge amount of the simulated film.

[0113] The distance (measurement distance) from the surface of the dummy film to the charge amount measuring device was set to 0 mm (i.e., on the dummy film), 25 mm, 50 mm, 75 mm, 100 mm, 125 mm, 150 mm, 175 mm, 200 mm, 300 mm, and 500 mm, and the charge amount was measured for each. This measurement distance corresponds to the distance from the transport web W to the charge amount measuring sensor 120 of the sensor unit 12 in the transport device 1 in Figure 1, which will be described later. The results are shown in Figure 8.

[0114] Figure 8 is a graph plotting the measured distance to the simulated film and the measured charge amount at that time in the payout test. In Figure 8, the horizontal axis represents the measured distance (unit: mm) from the transport web to the simulated film, and the vertical axis represents the measured charge amount (unit: kV) at that time.

[0115] As shown in Figure 8, when the measurement distance was 0 mm, the charge was -5.5 kV, but when the measurement distance was 50 mm, it became -4 kV, and as the measurement distance increased, the charge approached 0 kV, and when the measurement distance was 500 mm, it became -0.5 kV. In this way, it was confirmed that the measured charge value varied greatly within the range of -5.5 kV to -0.5 kV as the measurement distance of the imitation film varied.

[0116] <Example>

[0117] Next, as an example of the present invention, the transport device 1 shown in FIG. 1 was used to unwind the web W from the roll R, and the charge amount of the transported web W was measured in real time, and the measurement accuracy was verified.

[0118] First, a roll R was prepared as the web W, in which a polyethylene terephthalate film (PET, "Lumirror (trademark) T-60", 50 μm thick, manufactured by Toray Industries, Inc.) was wound around a roller 10. The web length was 500 m and the web width was 280 mm. The roll diameter of the roller 10 was 3 inches.

[0119] Next, a charge amount measuring device ("APB-01", manufactured by Harada Corporation) was installed as the charge amount measuring sensor 120 of the sensor unit 12 at a position 200 mm in front of the central axis of the roller 10. The distance from the sensor unit 12 to the transported web W at the start of payout was set to 50 mm. In other words, the measurement distance from the charge amount measuring sensor 120 to the transported web W was set to 50 mm.

[0120] Then, an electric actuator ("EAC2-E10-ARAK", manufactured by Oriental Motor Co., Ltd.) was used as the forward / backward moving part 121 and the rotational moving part 122 of the sensor part 12, and the position of the charge amount measuring sensor 120 was set to be automatically controlled so that the measurement distance from the charge amount measuring sensor 120 to the transported web W was always maintained at 50 mm during transport.

[0121] Furthermore, a first focal length measurement unit 13 was installed at a position 50 mm upstream from the sensor unit 12, and a second focal length measurement unit 14 was installed at a position 50 mm downstream from the sensor unit 12. Both the first focal length measurement unit 13 and the second focal length measurement unit 14 were installed at the edge of the conveying line. Both the first focal length measurement unit 13 and the second focal length measurement unit 14 were cameras equipped with lenses ("CS41-C", manufactured by Shodensha Co., Ltd.), and measured the focal length from each camera to the conveying web W (see Figure 3).

[0122] For the above-mentioned conveying line, a conveying web W2 was unwound from the roller 10 at a conveying speed of 20 m / min (see arrow F2 in FIG. 1) to conduct a unwinding test of the roll body R.

[0123] In the payout test, the change in tilt θ of the transport web W was calculated by the following method (see FIG. 3).

[0124] First, at a predetermined time from the start of unwinding, the first focal length measuring unit 13 measures the focal length a relative to the transport web W1, and the second focal length measuring unit 14 measures the focal length c relative to the transport web W1, and the inclination of the transport web W1 is detected from the positional relationship between the placement distance between the first focal length measuring unit 13 and the second focal length measuring unit 14, the focal length a, and the focal length c.

[0125] Next, after a predetermined time has elapsed since the above measurement, the first focal length measuring unit 13 measures the focal length b relative to the transport web W2, and the second focal length measuring unit 14 measures the focal length d relative to the transport web W2, and the inclination of the transport web W2 is detected from the positional relationship between the placement distance between the first focal length measuring unit 13 and the second focal length measuring unit 14, the focal length b, and the focal length d.

[0126] From the inclinations of the transport web W1 and the transport web W2 thus detected, the amount of change θ in the inclination between the two points in time was obtained and used as the amount of change in the position of the transport web W.

[0127] By performing the above method in real time, the change in tilt θ was obtained in real time from the start of payout, and the change in position of the transported web W was monitored in real time. The actuator was controlled based on the real-time change in position of the transported web W obtained in this way. Specifically, the sensor unit 12 moved in accordance with the change in position of the transported web, and was automatically controlled in real time to always maintain the initial measurement distance (50 mm) from the transported web W. The results are shown in Figure 9.

[0128] 9 is a graph showing the measurement results of the charge amount in the payout test of the example. In Fig. 9, the horizontal axis represents the payout amount (unit: m) of the transport web W in the rewinding test, and the vertical axis represents the charge amount (unit: kv) measured by the sensor unit 12.

[0129] Based on the results of the Reference Example (FIG. 8), when the measurement distance of the web W, for example, is based on a position of 50 mm, it is thought that when the measurement distance fluctuates from -50 mm to +50 mm from the reference position of 50 mm, a variation of about ±50% occurs in the measurement value due to the positional variation. On the other hand, in the Example (FIG. 9), the variation from the start of payout (surface side) to the end of payout (core side), especially at the end of payout (core side), could be suppressed to a value lower than 50%.

[0130] In Figure 9 of the example, many peaks where the charge amount momentarily approaches 0 V are measured near the middle layer from the start of payout (surface side) to a payout amount of 400 m. This is not due to variations in the positional change of the web W during transport, but is thought to be due to the charge on the surface of the web W being discharged immediately after payout, resulting in an instantaneous voltage change.

[0131] From the above, it was confirmed that, according to the conveying method of this embodiment, there was little variation in the measured charge amount of the sensor unit 12 from the start of payout (payout amount 0 m) to the end of payout (payout amount 500 m), and that the sensor unit 12 was able to perform continuous sensing with high accuracy. [Explanation of symbols]

[0132] 1, 2, 3: conveying device, 10: Roller, 11: Guide roller, 12: Sensor unit, 13: (1st) focal length measurement section, 14: (2nd) focal length measurement section, 15: imaging unit, 16: Lateral imaging unit, 120: Charge amount measurement sensor, 121: Forward / backward moving part, 122: Rotational movement part, 150: Captured image, W, W1, W2: (transport) web, R, R1, R2: Roll body, F1, F2, F3, F4, F5, F6, F7, F8: arrows, A1: Right side area, A2: Left side of the field, θ: The amount of tilting change, a,b,c,d: focal length

Claims

1. A method for conveying a web, the web being unwound from or wound around a roller, comprising the steps of: a detection step of detecting a predetermined physical property of the transport web by a sensor unit after the transport web is unwound from the roller or before the transport web is wound around the roller, or a processing step of performing a predetermined processing on the transport web by a processing unit; a position information acquiring step of detecting an inclination of the transport web in a side view without contacting the transport web and acquiring a change in the inclination as a position change of the transport web; a position control step of controlling a position of the sensor unit or the processing unit based on the amount of position change acquired in the position information acquisition step; Including, The position information acquisition step includes: At least two focal length measuring units each having a lens are disposed above or below the web conveying line in a side view, and one of the focal length measuring units is disposed at a position upstream of the other of the focal length measuring units in the conveying direction of the conveying web, For the transport web, each of the focal length measuring units acquires a focal length to a surface of the transport web, detects the inclination of the transport web from the acquired focal length, and acquires an amount of change in the inclination as an amount of change in position of the transport web. The method of transporting the web.

2. A method for conveying a web, the web being unwound from or wound around a roller, comprising the steps of: a detection step of detecting a predetermined physical property of the transport web by a sensor unit after the transport web is unwound from the roller or before the transport web is wound around the roller, or a processing step of performing a predetermined processing on the transport web by a processing unit; a position information acquiring step of detecting an inclination of the transport web in a side view without contacting the transport web and acquiring a change in the inclination as a position change of the transport web; a position control step of controlling a position of the sensor unit or the processing unit based on the amount of position change acquired in the position information acquisition step; Including, The position information acquisition step includes: At least two position measurement units each including an irradiation unit capable of irradiating an energy beam and a light receiving unit capable of receiving the energy beam are disposed above or below the transport line of the web in a side view, and one of the position measurement units is disposed at a position upstream of the other of the position measurement units in a transport direction of the transport web, the energy beam is irradiated from the irradiation unit of each of the position measurement units toward a surface of the transporting web, and the reflected wave of the energy beam reflected from the surface is received by the light receiving unit to obtain a distance to the transporting web, the inclination of the web is detected from the obtained distance, and an amount of change in the inclination is obtained as an amount of change in the position of the web. The method of transporting the web.

3. A method for conveying a web, the web being unwound from or wound around a roller, comprising the steps of: a detection step of detecting a predetermined physical property of the transport web by a sensor unit after the transport web is unwound from the roller or before the transport web is wound around the roller, or a processing step of performing a predetermined processing on the transport web by a processing unit; a position information acquiring step of detecting an inclination of the transport web in a side view without contacting the transport web and acquiring a change in the inclination as a position change of the transport web; a position control step of controlling a position of the sensor unit or the processing unit based on the amount of position change acquired in the position information acquisition step; Including, The position information acquisition step includes: At least one imaging unit having a lens is disposed above or below the web conveying line in a side view, With respect to the transport web, the imaging unit captures an image of a predetermined location on a surface of the transport web to obtain an image, detects the inclination of the transport web from image blur of the obtained image, and obtains an amount of change in the inclination as an amount of change in position of the transport web. The method of transporting the web.

4. A method for conveying a web, the web being unwound from or wound around a roller, comprising the steps of: a detection step of detecting a predetermined physical property of the transport web by a sensor unit after the transport web is unwound from the roller or before the transport web is wound around the roller, or a processing step of performing a predetermined processing on the transport web by a processing unit; a position information acquiring step of detecting an inclination of the transport web in a side view without contacting the transport web and acquiring a change in the inclination as a position change of the transport web; a position control step of controlling a position of the sensor unit or the processing unit based on the amount of position change acquired in the position information acquisition step; Including, The position information acquisition step includes: At least one side imaging unit is disposed on a side of the web conveying line, the side imaging unit detects the inclination of the web by imaging the transport web from a side surface of the transport web, and obtains an amount of change in the inclination as an amount of change in the position of the web; The method of transporting the web.

5. The position information acquiring step acquires the position change amount of the transport web in real time, The position control step controls a position of the sensor unit or the processing unit in real time based on the position change amount acquired in real time. The method for transporting a web according to any one of claims 1 to 4.

6. The detection step includes: measuring the charge amount of the transport web by the sensor unit; a step of detecting the presence or absence of foreign matter by the sensor unit that captures an image of the surface of the transport web and detects adhesion of foreign matter to the surface; a step of detecting the presence or absence of defects by the sensor unit that captures an image of the surface of the transport web and detects defects on the surface; measuring the amount of coating on the surface of the transport web by the sensor unit; and A step of detecting the uneven shape of the surface of the transport web by the sensor unit that detects the uneven shape of the surface of the transport web. Perform at least one selected from the group consisting of: The method for transporting a web according to any one of claims 1 to 5.

7. As the processing step, A step of slitting the transport web by the processing unit that cuts the side edges of the transport web; A step of performing laser processing on the transport web by the processing unit that irradiates the transport web with a laser; removing foreign matter from a surface of the transport web by the processing unit that sprays air onto the transport web; A step of sucking and removing foreign matter from the surface of the transport web by the processing unit that sucks air from the surface of the transport web; A step of correcting slack and / or wrinkles in the transport web by the processing unit having a guide roll mechanism for controlling meandering of the transport web; and The processing unit performs an electric discharge treatment on the surface of the transport web, and at least one step selected from the group consisting of a step of modifying the surface of the transport web is performed. The method for transporting a web according to any one of claims 1 to 6.

8. a winding step of winding the film around the roller, or a unwinding step of unwinding the film around the roller; A conveying step of conveying the web by the web conveying method according to any one of claims 1 to 7; A method for manufacturing a web, comprising:

9. A web conveying device for a web that is unwound from or wound around a roller, comprising: A conveying section that conveys the web; a sensor unit that detects a predetermined physical property of the transport web after it has been unwound from the roller or before it is wound around the roller, or a processing unit that performs a predetermined processing on the transport web; a position information acquisition unit that detects an inclination of the transport web in a side view without contacting the transport web after the transport web has been unwound from the roller or before the transport web is wound around the roller, and acquires a change in the inclination as a position change of the transport web; a position control unit that controls a position of the sensor unit or the processing unit based on the amount of position change acquired by the position information acquisition unit; Equipped with The location information acquisition unit At least two focal length measurement units each having a lens are included above or below the web transport line in a side view, and one of the focal length measurement units is disposed at a position upstream of the other focal length measurement unit in the transport direction of the transport web, For the transport web, each of the focal distance measuring units acquires a focal distance to a surface of the transport web, and detects the inclination of the transport web from the acquired focal distance. Web transport device.

10. A device for conveying a web which is unwound from or wound around a roller, comprising: A conveying section that conveys the web; a sensor unit that detects a predetermined physical property of the transport web after it has been unwound from the roller or before it is wound around the roller, or a processing unit that performs a predetermined processing on the transport web; a position information acquisition unit that detects an inclination of the transport web in a side view without contacting the transport web after the transport web has been unwound from the roller or before the transport web is wound around the roller, and acquires a change in the inclination as a position change of the transport web; a position control unit that controls a position of the sensor unit or the processing unit based on the amount of position change acquired by the position information acquisition unit; Equipped with The location information acquisition unit At least two position measurement units each including an irradiation unit capable of irradiating an energy beam and a light receiving unit capable of receiving the energy beam are provided above or below the transport line of the web in a side view, and one of the position measurement units is disposed at a position upstream of the other of the position measurement units in a transport direction of the transport web, the energy beam is irradiated from the irradiation unit of each of the position measurement units toward a surface of the transporting web, and the reflected wave of the energy beam reflected from the surface is received by the light receiving unit, thereby obtaining a distance to the transporting web, and detecting the inclination of the web from the obtained distance; Web transport device.

11. A device for conveying a web which is unwound from or wound around a roller, comprising: A conveying section that conveys the web; a sensor unit that detects a predetermined physical property of the transport web after it has been unwound from the roller or before it is wound around the roller, or a processing unit that performs a predetermined processing on the transport web; a position information acquisition unit that detects an inclination of the transport web in a side view without contacting the transport web after the transport web has been unwound from the roller or before the transport web is wound around the roller, and acquires a change in the inclination as a position change of the transport web; a position control unit that controls a position of the sensor unit or the processing unit based on the amount of position change acquired by the position information acquisition unit; Equipped with The location information acquisition unit At least one imaging unit having a lens is included above or below the web conveying line in a side view, The imaging unit captures an image of a predetermined portion on a surface of the transport web to obtain an image of the transport web, and detects the inclination of the transport web from an image blur of the captured image. Web transport device.

12. A device for conveying a web which is unwound from or wound around a roller, comprising: A conveying section that conveys the web; a sensor unit that detects a predetermined physical property of the transport web after it has been unwound from the roller or before it is wound around the roller, or a processing unit that performs a predetermined processing on the transport web; a position information acquisition unit that detects an inclination of the transport web in a side view without contacting the transport web after the transport web has been unwound from the roller or before the transport web is wound around the roller, and acquires a change in the inclination as a position change of the transport web; a position control unit that controls a position of the sensor unit or the processing unit based on the amount of position change acquired by the position information acquisition unit; Equipped with The location information acquisition unit At least one side imaging unit is included on a side of the web conveying line, The side imaging unit detects the inclination of the web by imaging the transport web from a side surface of the transport web. Web transport device.

Images