Apparatus and method for inspecting film laminate

Abstract

To provide an inspection device, with which it is possible to detect with high accuracy a defect existing in a film laminate such as a three-way bag supplied in sheets.SOLUTION: The inspection device comprises: a first conveyance unit 210 and a second conveyance unit 220; a first rotary conveyance unit 310; a second rotary conveyance unit 320; first transmission image acquisition units 410, 510 for acquiring a first transmission image due to transmitted light from the first face side of a conveyed three-way bag; second transmission image acquisition units 420, 520 for acquiring a second transmission image due to transmitted light from the second face side, which is reverse to the first face, of a conveyed three-way bag; a first reflection image acquisition unit 610 for acquiring an image due to reflected light from the first face side of the three-way bag circumferentially conveyed by the first rotary conveyance unit; and a second reflection image acquisition unit 620 for acquiring an image due to reflected light from the second face side, which is reverse to the first face, of the three-way bag circumferentially conveyed by the second rotary conveyance unit. The inspection device detects an abnormal image part equivalent to a defect on the basis of the acquired images.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an inspection device and an inspection method for a "film laminate" having a structure in which films are laminated, such as a three-sided bag, and in particular to an inspection device and an inspection method for detecting defects present in a film laminate that is supplied sheet by sheet. [Background technology]

[0002] In recent years, three-sided bags made of flexible materials such as resin films and having both sides and the bottom edge of the package joined by heat sealing or the like have been widely used as packaging materials for medicines, medical instruments, processed foods, confectioneries, daily necessities, etc. (For example, Patent Document 1). These three-sided bags are manufactured by overlapping two sheets of resin film with printing on the outer surfaces, joining the three sides by heat sealing, and then cutting them individually. For example, Patent Document 1 discloses a method for making three-sided sealed bags with different designs on the front and back. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-111483 A [Patent Document 2] JP 2018-12250 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, film laminates, such as three-sided bags, which are structures in which films are laminated, may have defects such as pinholes, scratches, foreign matter attached to the surface, etc. In addition, there are also defects such as minute printing irregularities and "fish eyes" which are circular holes that occur during the printing process, and it is necessary to reliably detect these defects during the inspection process.

[0005] However, particularly in the case of sheet-like shapes such as three-sided bags, the objects themselves often have deformed shapes that deviate from a flat shape, such as undulations or warping. It is extremely difficult to perform accurate image inspection of defects such as pinholes, scratches, foreign bodies, uneven printing, and fisheyes on objects with such deformed shapes, and so until now inspection has mainly been performed visually.

[0006] Furthermore, when different designs are printed on each film, it becomes difficult to distinguish between subtle misalignments in the overlapping print and defects, making it even more difficult to detect defects.

[0007] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a film laminate inspection device and inspection method that are capable of accurately detecting defects present in a film laminate, such as a three-sided bag, that is supplied sheet by sheet. [Means for solving the problem]

[0008] An inspection device for a film laminate according to one embodiment of the present disclosure is an inspection device for a film laminate supplied sheet by sheet, and includes a first conveying unit and a second conveying unit that hold and convey the film laminate by suction, a first transmission image acquisition unit that acquires a first transmission image by transmitted light from a first surface side of the film laminate conveyed by the first conveying unit, and a second transmission image acquisition unit that acquires a first transmission image by transmitted light from a second surface side opposite to the first surface of the film laminate conveyed by the second conveying unit. Second Transmission a second transmission image acquisition unit that acquires an image; a first rotary conveyance unit that rotates the film stack with the first surface facing outward; a second rotary conveyance unit that rotates the film stack with the second surface facing outward; and a second rotary conveyance unit that captures an image by reflected light from the side of the first surface of the film stack that is circumferentially conveyed by the first rotary conveyance unit. First reflection a first reflected image acquisition unit that acquires an image, and an image of the second surface of the film stack that is conveyed by the second rotary conveyor unit, the first reflected image acquisition unit acquiring an image of the second surface of the film stack that is conveyed by the second rotary conveyor unit, the first reflected image acquisition unit acquiring an image of the second surface of the film stack that is conveyed by the second rotary conveyor unit, the second ... Second reflectionand a second reflection image acquisition unit that acquires an image, wherein the first conveying unit is configured such that a plurality of conveying belts are arranged in series in the conveying direction with a predetermined gap therebetween, and an imaging location of the first transmission image by the first transmission image acquisition unit in the conveying direction is a location where no conveying belt is present between the plurality of conveying belts arranged in series in the conveying direction, and the film stack at the imaging location of the first transmission image is configured to be at the same position in a direction perpendicular to the conveying direction as the plurality of conveying belts that are present with the gap therebetween, and the second conveying unit is configured such that a plurality of conveying belts are arranged in series in the conveying direction with a predetermined gap therebetween, and the second transmission image acquisition unit in the conveying direction is configured such that a plurality of conveying belts are arranged in series in the conveying direction with a predetermined gap therebetween, and The location where the second transmitted image is captured by the image acquisition unit is a location where there is no conveying belt between the multiple conveying belts arranged in series in the conveying direction, and the film stack at the imaging location of the second transmitted image is configured to be at the same position in a direction perpendicular to the conveying direction as the multiple conveying belts existing through the gap, and the first conveying unit and the second conveying unit each have a pressure roller on the downstream side of the conveying direction of the specified gap for holding the film stack on the conveying belt when the film stack is handed over between the multiple conveying belts, and an abnormal image portion corresponding to a defective portion is detected based on the first transmitted image, the first reflected image, the second transmitted image, and the second reflected image.

[0009] A method for inspecting a film laminate according to an embodiment of the present disclosure is a method for inspecting a film laminate supplied sheet by sheet, comprising the steps of: holding and transporting the film laminate by suction using a first transport section and a second transport section; acquiring a first transmission image by a transmitted light from a first surface side of the film laminate transported by the first transport section using a first transmission image acquisition section; and acquiring a second transmission image by a transmitted light from a second surface side opposite to the first surface of the film laminate transported by the second transport section. Second Transmissiona step of rotating the film stack by a first rotary conveyor unit while placing the film stack on a peripheral surface with the first surface facing outward; a step of rotating the film stack by a second rotary conveyor unit while placing the film stack on a peripheral surface with the second surface facing outward; and a step of capturing an image of the film stack by reflected light from the side of the first surface of the film stack being circumferentially conveyed by the first rotary conveyor unit. First reflection a step of acquiring an image by a first reflected image acquiring unit, and acquiring an image by reflected light from the side of the second surface of the film stack transported by the second rotary transport unit. Second reflection and acquiring an image by a second transmission image acquiring unit, wherein in the step of acquiring the first transmission image by the first transmission image acquiring unit, an image is taken of a location where there is no conveyor belt between a plurality of conveyor belts arranged in series in the conveying direction by being spaced apart from each other in the conveying direction in the first conveying unit, and the film stack at the image taking location is at the same position in a direction perpendicular to the conveying direction as the plurality of conveyor belts arranged in series in the conveying direction by being spaced apart from each other in the conveying direction in the second conveying unit, and the first transmission image is acquired in a state where the film stack at the image taking location is at the same position in a direction perpendicular to the conveying direction as the plurality of conveyor belts arranged in series in the conveying direction by being spaced apart from each other in the conveying direction in the second conveying unit. The imaging location is a location where there are no conveyor belts between belts, and the second transmission image is acquired while the film stack at the imaging location is at the same position in a direction perpendicular to the conveying direction as the multiple conveyor belts that are present through the gaps. In the process of conveying the film stack by a first conveying section and a second conveying section, the film stack is held on the conveying belts when the film stack is handed over between the multiple conveying belts by a pressure roller arranged downstream of the specified gap in the conveying direction, and an abnormal image portion corresponding to a defective portion is detected based on the first transmission image, the first reflection image, the second transmission image, and the second reflection image. Effect of the Invention

[0010] According to an embodiment of the present disclosure, an inspection device and an inspection method for a film laminate can accurately detect defects present in a film laminate, such as a three-sided bag, that is supplied sheet by sheet. [Brief description of the drawings]

[0011] [Figure 1] 1 is a front view showing a schematic configuration of an inspection device for a film laminate according to an embodiment of the present disclosure. [Diagram 2] 1 is a top view showing a schematic configuration of a suction belt, a rotating drum, and a three-sided bag of a film laminate inspection device according to an embodiment of the present disclosure, as viewed from directly above. [Diagram 3] FIG. 13 is a diagram for explaining a modified example of an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <Embodiment> The configuration of an inspection device for a film laminate according to an embodiment of the present disclosure will be described below with reference to the drawings, taking as an example a three-sided bag in which two overlapping resin films are joined at three sides by heat sealing.

[0013] FIG. 1 is a front view showing the schematic configuration of the inspection device 1 according to embodiment 1, and FIG. 2 is a top view showing the schematic configuration of the suction belt 211 (A, B, C), rotating drum 311, and three-sided bag ST in the inspection device 1 as viewed from directly above.

[0014] The inspection device 1 has a first conveying section 210, a second conveying section 220, a third conveying section 710, a defective bag discharge section 720, and a finished product discharge section 730, which convey three-sided bags ST in the form of sheets.

[0015] In addition, between the first conveying section 210 and the second conveying section 220, there is a first rotating conveying section 310 that circumferentially conveys the three-sided bags ST, and between the second conveying section 220 and the third conveying section 710, there is a second rotating conveying section 320 that circumferentially conveys the three-sided bags ST.

[0016] In addition, within the conveying area of ​​the first conveying section 210, there are a color transmission image acquisition section 410 and a monochrome transmission image acquisition section 510 which capture images of the three-sided bag ST being conveyed, and within the conveying area of ​​the second conveying section 220, there are a color transmission image acquisition section 420 and a monochrome transmission image acquisition section 520 which capture images of the three-sided bag ST being conveyed, and within the conveying area of ​​the first rotating conveying section 310, there is a reflected image acquisition section 610 which captures images of the three-sided bag ST being rotated and conveyed, and within the conveying area of ​​the second rotating conveying section 320, there is a reflected image acquisition section 620 which captures images of the three-sided bag ST being rotated and conveyed.

[0017] Furthermore, the inspection device 1 includes an apparatus drive control unit (not shown) that drives and controls the inspection device 1 .

[0018] Three-sided bags ST are commonly distributed products such as medicines, medical equipment, processed foods, confectionery, and daily necessities, and are configured, for example, by stacking (laminating) two resin films and joining the edges on three sides to form a bag. The resin film may be light-transmitting or may be opaquely printed or may be light-shielding by vapor deposition of aluminum or the like. Furthermore, the outer surfaces of the two resin films may have letters or designs on them.

[0019] Defects in the three-sided bag ST that are to be detected by the inspection device 1 include pinholes, scratches, foreign matter, uneven printing, fish eyes, and the inclusion of fibers, hairs, etc.

[0020] Next, each part of the inspection device 1 will be described.

[0021] The first conveying section 210 is configured such that conveying means 210A, conveying means 210B, and conveying means 210C are arranged in series in the conveying direction with a predetermined gap between them, and the second conveying section 220 is configured such that conveying means 220A, conveying means 220B, and conveying means 220C are similarly arranged in series in the conveying direction with a predetermined gap between them.

[0022] The conveying means 210A, 210B, 210C operate in conjunction to convey the three-sided bag ST in the M1 direction to the circumferential surface (cylindrical surface) of the rotating drum 311 of the first rotating conveying section 310, and the conveying means 220A, 220B, 220C operate in conjunction to convey the three-sided bag ST in the M2 direction to the circumferential surface (cylindrical surface) of the rotating drum 321 of the second rotating conveying section 320.

[0023] Furthermore, the first conveying section 210 includes conveying belts 211A, 211B, and 211C (hereinafter collectively referred to as "conveying belt 211"), pulleys 212A, 212B, and 212C (hereinafter collectively referred to as "pulleys 212"), 213A, 213B, and 213C (hereinafter collectively referred to as "pulleys 213"), and pressure rollers 214A, 214B, and 214C (hereinafter collectively referred to as "pressure rollers 214").

[0024] Similarly, the conveying section 220 includes conveying belts 221A, 221B, and 221C (hereinafter collectively referred to as "conveying belt 221"), pulleys 222A, 222B, and 222C (hereinafter collectively referred to as "pulleys 222"), 223A, 223B, and 223C (hereinafter collectively referred to as "pulleys 223"), and pressure rollers 224A, 224B, and 224C (hereinafter collectively referred to as "pressure rollers 224").

[0025] The conveying belts 211, 221 are belts that hold and convey the three-sided bag ST on their upper surfaces, and are suspended between pulleys 212 and 213, and between pulleys 222 and 223, respectively. The pulleys 212, 213, 222, 223 are driven and controlled by an apparatus drive control unit (not shown), thereby conveying the three-sided bag ST.

[0026] Here, in order to ensure that the three-sided bag ST is held securely by the conveyor belts 211, 221, for example, the conveyor belt may be provided with a plurality of air intake holes (not shown) and a suction device (not shown) that draws in air from these air intake holes, so that the three-sided bag ST placed on the conveyor belts 211, 221 is securely held and conveyed by being sucked and adsorbed.

[0027] The pressing rollers 214, 224 are intended to ensure that the three-sided bag ST is held properly on the conveyor belts when the three-sided bag ST is transferred between the conveyor belts, and may be provided as required.

[0028] Next, the first rotary conveying section 310 is a mechanism that receives the three-sided bag ST from the first conveying section 210, conveys it in a circular motion in the M3 direction, and hands it over to the second conveying section 220, and the second rotary conveying section 320 is a mechanism that receives the three-sided bag ST from the second conveying section 220, conveys it in a circular motion in the M4 direction, and hands it over to the third conveying section 710.

[0029] The first rotary conveying section 310 includes a rotary drum 311 and a pressure roller 312, while the second rotary conveying section 320 includes a rotary drum 321 and a pressure roller 322. The rotary drums 311 and 321 are rotary drums that hold and rotate the three-sided bag ST on their surfaces (circumferential surfaces) by, for example, suction and adsorption. The rotary drums 311 and 321 are provided with a plurality of air intake holes (not shown) on their peripheral surfaces, and the three-sided bag ST on the peripheral surfaces is sucked in by suction and adsorption by sucking in gas on the peripheral surfaces from the inside of the rotary drums 311 and 321 through the air intake holes (not shown).

[0030] The pressure rollers 312, 322 are intended to ensure that the three-sided bag ST is held properly on the circumferential surfaces of the rotating drums 311, 321 when the three-sided bag ST is transferred from the conveyor belts 211C, 221C to the rotating drums 311, 321, and may be provided as necessary.

[0031] Next, the color transmission image acquisition units 410, 420 are image acquisition means that acquire color transmission images of the three-sided bag ST being transported within the transport range of the transport units 210, 220 as the imaging target, and the color transmission image acquisition unit 410 is provided between the transport means 210A and the transport means 210B, and the color transmission image acquisition unit 420 is provided between the transport means 220A and the transport means 220B, which are arranged in series in the transport direction with a predetermined gap between them.

[0032] The color transmission image acquisition section 410 includes a color light source section 411 and an imaging section 412, and is provided facing each other across the conveying section 210 at a position (Lx1) between the conveying means 210A and 210B.

[0033] The color transmission image acquisition unit 420 includes a color light source unit 421 and an imaging unit 422, and is provided facing each other across the conveying unit 220 at a position (Lx2) between the conveying means 220A and 220B. According to the above configuration, the color transmission image acquisition units 410 and 420 acquire transmission images from different sides of the three-sided bag ST.

[0034] In addition, the monochrome transmission image acquisition units 510, 520 are image acquisition means that acquire monochrome transmission images by imaging the three-sided bag ST being transported within the transport range of the transport units 210, 220, and the monochrome transmission image acquisition unit 510 is provided between the transport means 210A and the transport means 210B, and the monochrome transmission image acquisition unit 520 is provided between the transport means 220A and the transport means 220B, which are arranged in series in the transport direction with a predetermined gap between them.

[0035] The monochrome transmission image acquisition section 510 includes a monochrome light source section 511 and an imaging section 512, and is provided at a position (Ly1) between the transport means 210B and 210C so as to face each other with the transport section 210 therebetween.

[0036] The monochrome transmission image acquisition section 520 includes a monochrome light source section 521 and an imaging section 522, and is provided at a position (Ly2) between the transport means 220B and 220C so as to face each other with the transport section 220 therebetween.

[0037] According to the above configuration, the monochrome transmission image acquisition units 510 and 520 acquire transmission images from different sides of the three-sided bag ST.

[0038] Here, the locations where the color transmission image acquisition units 410, 420 and the monochrome transmission image acquisition units 510, 520 capture transmission images are between the conveying belts arranged in series in the conveying direction with a predetermined gap between them (Lx1, Ly1, Lx2, Ly2), where no conveying belt is present, i.e., this is a "gap" in the conveying belt.

[0039] Therefore, in order to perform good imaging at each of the locations Lx1, Ly1, Lx2, and Ly2, the three-sided bag ST needs to be handed over properly between the conveying belts, that is, after the leading edge of the three-sided bag ST held by the upstream conveying belt passes through the gap (the above-mentioned specified gap) and reaches the downstream conveying belt, it needs to continue to be adsorbed and held properly by the downstream conveying belt as well.

[0040] This is because, in the case of a sheet-fed type such as a three-sided bag ST, the shape itself is accompanied by deformations such as "undulations" and "warping." If the downstream conveyor belt does not maintain good suction hold when the bag passes through a "gap" in the conveyor belt, the position of the three-sided bag ST at the imaging location (Lx1, Ly1, Lx2, Ly2) will vary, which may hinder the acquisition of a transmission image.

[0041] However, according to the embodiment described above, when the three-sided bag ST is transferred from the upstream conveyor belt to the downstream conveyor belt, the presence of the presser rollers 214, 224 means that the three-sided bag ST is well held on the downstream conveyor belt as well, and therefore the position of the three-sided bag ST in the Z direction at the imaging position (Lx1, Ly1, Lx2, Ly2) is in a stable state with reduced variation, i.e., approximately equal to the position of the conveyor belt, making it possible to capture a good transmitted image. Next, the reflected image acquisition units 610, 620 will be described. The reflected image acquisition units 610, 620 have light source units 611, 621 and imaging units 621, 622, and are means for capturing an image of a three-sided bag ST transported within the transport range of the first rotary conveying unit 310 and the second rotary conveying unit 320, and capturing a monochrome reflected image or a color reflected image at an imaging position (L3, L4). When the angle θ between the optical axis of the light source units 611, 621 and the imaging axis of the imaging units 612, 622 is tilted at an angle close to an acute angle, an image can be captured of a state in which light is reflected directly, and when the angle is tilted at an angle close to an obtuse angle, an image can be captured of a state in which diffuse light is irradiated.

[0042] Here, the three-sided bag ST, particularly when it is supplied sheet by sheet, has a shape that includes undulations and warping, which are factors that hinder the acquisition of reflected images. However, according to the embodiment described above, the three-sided bag ST is attracted to and held by the cylindrical surfaces that are the circumferential surfaces of the rotating drums 311, 321, so that the shape of the three-sided bag ST follows the cylindrical surfaces of the rotating drums 311, 321. Therefore, any undulations or warping of the three-sided bag ST itself is reduced to a level that does not hinder the acquisition of reflected images, and the distance between the rotating drums 311, 321 and the reflected image acquisition units 610, 620 is also approximately stable at the respective distances between the rotating drums 311, 321 and the reflected image acquisition units 610, 620, making it possible to capture good reflected images.

[0043] Then, by applying known techniques (e.g., filtering processing, differential processing, etc.) to the images (monochrome, color, transmission, reflection) obtained by capturing an image of the three-sided bag ST using the inspection device 1 configured as described above, defective parts (pinholes, scratches, foreign objects, fish eyes, etc.) can be detected (especially while distinguishing them from the printed design on the three-sided bag ST), and three-sided bags having defective parts can be identified and separated from non-defective products without defects.

[0044] Specifically, the third conveying section 710 includes a conveying belt 711 and pulleys 712 and 713, and the conveying belt 711 suspended between the pulleys 712 and 713 is driven and controlled by an apparatus drive control section (not shown) to convey the three-sided bag ST to a defective bag discharge section 720. The defective bag discharge section 720 includes a conveying belt 721 and pulleys 722 and 723, and is driven and controlled by an apparatus drive control section (not shown) to convey the three-sided bag ST to a finished product discharge section 730 if the three-sided bag ST does not contain a defect. On the other hand, if the three-sided bag ST is a defective bag that contains a defect, pulley 723 moves downward around pulley 724 as the rotation center to change the conveying path, and the defective bag is discharged onto tray 724. The finished product discharge section 730 includes a conveyor belt 731 and pulleys 732 and 733, and is driven and controlled by an apparatus drive control section (not shown) to discharge non-defective finished products onto a tray 734.

[0045] Here, as the transmission image acquisition units 410, 510, 420, 520 and the reflection image acquisition units 610, 620 in the above description, for example, a one-trigger three-scan system manufactured by CCS Corporation can be used. This is a system that captures images by switching three light sources on and off at high speed for each scan of the line camera, and it is possible to realize images that conventionally required three cameras for three inspection stages, but can be realized with one camera per stage, almost simultaneously (with a time delay within the time of one scan of the line camera at most). By using three light sources of R, G, and B as the three light sources, or by varying the brightness of the monochrome light source unit in three stages, it is possible to obtain color images of R, G, and B captured almost simultaneously, or monochrome images with three different brightness levels. The images obtained in this way are suitable for detecting defects with high accuracy.

[0046] <<Variations>> In the above-described embodiment, an example was shown in which the brightness of the W light source was varied within one scan of the line camera to obtain a monochrome image with several different levels of brightness, but a modified example of the embodiment of the present disclosure shows a different aspect.

[0047] That is, Figure 3(a) shows an embodiment in which, when one scan of the line camera is started by a trigger signal (Tr), the brightness (V1) of the monochrome light source unit and the light emission time (T1) are not changed during one scan of the line camera in synchronization with the trigger signal (Tr), but the exposure time of the line camera is varied (T1, T2, T3), thereby obtaining monochrome images with three different levels of brightness. Figure 3(b) shows an embodiment in which, when one scan of the line camera is started by a trigger signal (Tr), the brightness (V1) of the monochrome light source unit does not change during one scan of the line camera in synchronization with the trigger signal (Tr), but the light emission time (T1, T2, T3) and the exposure time (T1, T2, T3) of the line camera are synchronized and varied for imaging, thereby obtaining monochrome images with three different levels of brightness.

[0048] According to the above aspect, compared to an aspect in which imaging is performed by varying the brightness of the monochrome light source unit, the effect of obtaining monochrome images with several different levels of brightness can be achieved even by using a general monochrome light source, making it possible to achieve this effect at a lower cost.

[0049] The inspection device and inspection method for a film laminate according to the embodiment and the modified example of the present disclosure described above are not limited to the above-mentioned embodiment and modified example except for their essential characteristic components. For example, the present disclosure also includes forms obtained by applying various modifications to the embodiment that a person skilled in the art can think of, and forms realized by arbitrarily combining components and functions within the scope of the present invention. [Industrial Applicability]

[0050] The film laminate inspection device and inspection method according to one embodiment of the present disclosure can be widely used in the manufacturing process of three-sided bags for packaging, for example, medicines, medical instruments, processed foods, confectioneries, daily necessities, etc. In addition, the film laminate inspection device and inspection method can be suitably used as part of a packaging device that uses a film laminate, such as a three-sided bag. [Explanation of symbols]

[0051] 1. Film laminate inspection device 210 First conveyor section 210A, 210B, 210C conveying means, conveying means, conveying means 211A, 211B, 211C Conveyor suction belt 212A, 212B, 212C Pulleys 213A, 213B, 213C Pulleys 214A, 214B, 214C Presser roller 220 Second conveyor section 220A, 220B, 220C conveying means, conveying means, conveying means 221A, 221B, 221C Conveyor suction belt 222A, 222B, 222C Pulleys 223A, 223B, 223C Pulleys 224A, 224B, 224C Presser roller 310 First Rotary Conveyor Section 311 Rotating Drum 312 Presser roller 320 Second Rotary Conveyor 321 Rotating Drum 322 Presser roller 410 Color transmission image acquisition unit 411 Color light source unit 412 Imaging unit 420 Color transmission image acquisition unit 421 Color light source unit 422 Imaging unit 510 Monochrome transmission image acquisition unit 511 Monochrome light source unit 512 Imaging unit 520 Monochrome transmission image acquisition unit 521 Monochrome light source unit 522 Imaging unit 610 Reflection image acquisition unit 611 Light source section 612 Imaging unit 620 Reflection image acquisition unit 621 Light source section 622 Imaging unit 710 Conveyor 711 Suction Belt 712 Pulley 713 Pulley 720 Defective bag discharge section 721 Suction Belt 722 Pulley 723 Pulley 724 Tray 730 Finished product unloading department 731 Suction Belt 732 Pulley 733 Pulley 734 Tray

Claims

1. An inspection device for a film laminate supplied sheet by sheet, a first conveying unit and a second conveying unit that adsorb and hold and convey the film laminate; a first transmission image acquisition unit that acquires a first transmission image by transmitted light from a first surface side of the film laminate transported by the first transport unit; a second transmission image acquisition unit that acquires a second transmission image by transmitted light from a side of a second surface of the film laminate transported by the second transport unit, the second transmission image being obtained from the side of a second surface facing away from the first surface of the film laminate; a first rotary conveying section that rotates the film laminate with the first surface facing outward from the circumferential surface; and a second rotary conveying section that rotates the film laminate with the second surface facing outward from the circumferential surface. a first reflection image acquisition unit that acquires a first reflection image by reflected light from a side of the first surface of the film stack that is circumferentially transported by the first rotary transport unit; a second reflection image acquisition unit that acquires a second reflection image by reflected light from a side of the second surface of the film stack that is circumferentially transported by the second rotary transport unit; Equipped with the first conveying section is configured such that a plurality of conveying belts are arranged in series in the conveying direction with a predetermined gap therebetween, and an imaging location of the first transmitted image by the first transmitted image acquiring section in the conveying direction is a location where no conveying belt is present between the plurality of conveying belts arranged in series in the conveying direction, and the film stack at the imaging location of the first transmitted image is configured to be at the same position in a direction perpendicular to the conveying direction as the plurality of conveying belts that are present with the gap therebetween, the second conveying section is configured such that a plurality of conveying belts are arranged in series in the conveying direction with a predetermined gap therebetween, and an imaging location of the second transmitted image by the second transmitted image acquisition section in the conveying direction is a location where no conveying belt is present between the plurality of conveying belts arranged in series in the conveying direction, and the film stack at the imaging location of the second transmitted image is configured to be at the same position in a direction perpendicular to the conveying direction as the plurality of conveying belts that are present with the gap therebetween, the first conveying section and the second conveying section each have a pressing roller on a downstream side of the predetermined gap in a conveying direction, the pressing roller holding the film stack on the conveying belt when the film stack is transferred between the plurality of conveying belts; Detecting an abnormal image portion corresponding to a defect portion based on the first transmission image, the first reflection image, the second transmission image, and the second reflection image. Film laminate inspection equipment.

2. A method for inspecting a film stack supplied sheet by sheet, comprising the steps of: a step of holding and transporting the film laminate by suction using a first transport unit and a second transport unit; acquiring a first transmission image by a first transmission image acquisition unit using transmitted light from a first surface side of the film laminate transported by the first transport unit; acquiring a second transmission image by a second transmission image acquisition unit using transmitted light from a side of a second surface of the film laminate transported by the second transport unit, the second transmission image acquisition unit being opposite to the first surface; a step of rotating the film laminate by a first rotary conveying unit while placing the film laminate on a peripheral surface with the first surface facing outward from the peripheral surface; and a step of rotating the film laminate by a second rotary conveying unit while placing the film laminate on a peripheral surface with the second surface facing outward from the peripheral surface. acquiring a first reflected image by a first reflected image acquisition unit from a side of the first surface of the film stack transported by the first rotary transport unit; acquiring a second reflected image by reflected light from the second surface side of the film stack transported by the second rotary transport unit, using a second reflected image acquisition unit; Equipped with In the step of acquiring the first transmission image by the first transmission image acquiring unit, a location where there is no conveyor belt between a plurality of conveyor belts arranged in series in the conveying direction by being spaced apart from each other in the conveying direction in the first conveying unit is set as an imaging location, and the first transmission image is acquired in a state where the film stack at the imaging location is at the same position in a direction perpendicular to the conveying direction as the plurality of conveyor belts that are spaced apart from each other in the conveying direction, In the step of acquiring the second transmission image by the second transmission image acquisition unit, a location where there is no conveyor belt between a plurality of conveyor belts arranged in series in the conveying direction by being spaced apart from each other in the conveying direction in the second conveying unit is set as an imaging location, and the second transmission image is acquired in a state where the film stack at the imaging location is at the same position in a direction perpendicular to the conveying direction as the plurality of conveyor belts that are spaced apart from each other in the conveying direction, In the step of transporting the film laminate by the first transport section and the second transport section, the film laminate is held on the transport belts by a pressure roller disposed downstream of the predetermined gap in the transport direction when the film laminate is transferred between the plurality of transport belts; Detecting an abnormal image portion corresponding to a defect portion based on the first transmission image, the first reflection image, the second transmission image, and the second reflection image. A method for inspecting a film stack.

Images