JP2021117071A - Inspection equipment and inspection method for film laminates - Google Patents

Abstract

[Problem] To provide an inspection device capable of detecting defects present in a film laminate such as a three-sided bag supplied sheet by sheet with high accuracy. [Solution] The inspection device includes a first conveying section (210) and a second conveying section (220), a first rotating conveying section (310), a second rotating conveying section (320), a first transmitted image acquiring section (410, 510) for acquiring a first transmitted image by transmitted light from a first surface side of the three-sided bag being conveyed, a second transmitted image acquiring section (420, 520) for acquiring an image by transmitted light from a second surface side opposite to the first surface of the three-sided bag being conveyed, a first reflected image acquiring section (610) for acquiring an image by reflected light from a first surface side of the three-sided bag being conveyed by the first rotating conveying section, and a second reflected image acquiring section (620) for acquiring an image by reflected light from a second surface side opposite to the first surface of the three-sided bag being conveyed by the second rotating conveying section, and detects an abnormal image portion corresponding to a defect portion based on the acquired images. [Selected Figure] Figure 1

Description

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, an inspection for detecting a defect portion existing in a film laminate supplied in a single sheet. Regarding equipment and inspection methods.

In recent years, as a packaging member for pharmaceuticals, medical instruments, processed foods, confectionery, daily necessities, etc., it is composed of a flexible member such as a resin film, and both side edges and low edges of the package are joined by heat seal or the like. The three-sided bag is widely used (for example, Patent Document 1). This three-sided bag is manufactured by stacking two resin films printed on the outer surface, joining the three sides by heat sealing, and then individually cutting the three-sided bag. For example, Patent Document 1 discloses a method for making a three-way seal bag having different designs on the front and back sides.

Japanese Unexamined Patent Publication No. 2014-111483 JP-A-2018-12250

However, a film laminate having a structure in which films are laminated, such as such a three-sided bag, may have defective portions such as pinholes, scratches, and foreign substances adhering to the surface. In addition, there are also defective parts such as fine printing unevenness and "fish eyes" which are circular omissions that occur in the printing process, and it is required to reliably detect these defective parts in the inspection process.

However, especially in the case of a single-wafered form such as a three-sided bag, it often has a deformed shape that deviates from the flat shape such as "waviness" or "warp", and an inspection having such a deformed shape. It is very difficult to accurately inspect defective parts such as pinholes, scratches, foreign substances, printing unevenness, and fish eyes on the subject, and so far, the inspection has been mainly performed visually.

Furthermore, when different designs are printed on each film, it becomes difficult to distinguish between the slight deviation of the overlap of printing and the defective portion, which makes it even more difficult to detect the defective portion. There was also a problem.

The present disclosure has been made in view of the above problems, and is an inspection device for a film laminate that can accurately detect defects existing in a film laminate such as a three-sided bag supplied in a single sheet. And to provide an inspection method.

The inspection device for the film laminate according to one aspect of the present disclosure is an inspection device for the film laminate supplied in a single sheet, and includes a first transport unit and a second transport portion for transporting the film laminate, and the first transport unit. A first transmitted image acquisition unit that acquires a first transmitted image by transmitted light from the first surface side of the film laminate transported by the first transport unit, and a film laminate transported by the second transport unit. A second transmitted image acquisition unit that acquires an image by transmitted light from the side of the second surface that faces the first surface, and the film laminate are rotated with the first surface facing outward. A first rotary transport unit that rotates by placing it on a surface, a second rotary transport unit that rotates by placing the three-sided bag on the peripheral surface with the second surface facing outward from the periphery, and the first A first reflected image acquisition unit that acquires an image by reflected light from the side of the first surface of the three-sided bag that is circumferentially transported by the rotary transport unit, and the three sides that are circumferentially transported by the second rotary transport unit. A second reflected image acquisition unit that acquires an image by reflected light from the side of the second surface of the bag is provided, and the first transmitted image, the first reflected image, and the second transmitted image are provided. , And, based on the second reflected image, an abnormal image portion corresponding to a defective portion is detected.

Further, the method for inspecting the film laminate according to one aspect of the present disclosure is a method for inspecting the film laminate supplied in a single sheet, and is a step of transporting the film laminate by the first transport unit and the second transport unit. And the step of acquiring the first transmitted image by the transmitted light from the first surface side of the film laminate transported by the first transport unit by the first transmitted image acquisition unit, and the second transport unit. A step of acquiring an image by transmitted light from the side of the second surface of the film laminate to be conveyed, which is opposite to the first surface, by the second transmitted image acquisition unit, and the film by the first rotary conveying unit. A step of placing the laminate on the peripheral surface with the first surface facing outward and rotating the laminate, and using the second rotation transporting unit to place the three-sided bag on the peripheral surface with the second surface facing outward. A step of mounting and rotating, and a step of acquiring an image by reflected light from the side of the first surface of the three-sided bag which is circumferentially conveyed by the first rotary transport unit by the first reflected image acquisition unit. 1. It is characterized in that an abnormal image portion corresponding to a defect portion is detected based on the transmitted image, the first reflected image, the second transmitted image, and the second reflected image.

According to the inspection apparatus and inspection method for the film laminate according to one aspect of the present disclosure, it is possible to accurately detect the defective portion existing in the film laminate such as a three-sided bag supplied in a single sheet.

It is a front view which shows the schematic structure of the inspection apparatus of the film laminated body which concerns on embodiment of this disclosure. It is a top view which shows the schematic structure when the suction belt, the rotary drum, and the three-sided bag of the inspection apparatus of the film laminate which concerns on embodiment of this disclosure are seen from directly above. It is a figure for demonstrating the modification of embodiment of this disclosure.

<< Embodiment >>
The configuration of the inspection apparatus for the film laminate according to the 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 resin films are laminated and three sides are joined by heat sealing. ..

FIG. 1 is a front view showing a schematic configuration of the inspection device 1 according to the first embodiment, and FIG. 2 shows the suction belt 211 (A, B, C), the rotary drum 311, and the three-sided bag ST in the inspection device 1. It is a top view which shows the schematic structure when viewed from directly above.

The inspection device 1 has a first transport unit 210, a second transport unit 220, a third transport unit 710, a defective bag discharge unit 720, and a finished product carry-out unit 730, which transport the three-sided bag ST in the form of a single leaf.

Further, a first rotary transport unit 310 for circumferentially transporting the three-way bag ST between the first transport unit 210 and the second transport unit 220, and a three-way transport unit 310 between the second transport unit 220 and the third transport unit 710. It has a second rotary transport unit 320 that peripherally transports the bag ST.

Further, in the transport region of the first transport unit 210, a color transmission image acquisition unit 410 and a monochrome transmission image acquisition unit 510 that image the three-way bag ST to be transported are placed in the transport region of the second transport unit 220. A color transmission image acquisition unit 420 and a monochrome transmission image acquisition unit 520 that image the three-way bag ST to be conveyed, and a three-way bag ST that is rotationally conveyed within the transfer area of the first rotation transfer unit 310. A reflection image acquisition unit 610 that captures an image of the image is provided, and a reflection image acquisition unit 620 that captures a three-way bag ST that is rotationally conveyed is included in the transfer region of the second rotation transfer unit 320.

Further, it has a device drive control unit (not shown) that drives and controls the inspection device 1.

The three-sided bag ST is a product that is generally distributed such as pharmaceuticals, medical instruments, processed foods, confectionery, and daily necessities. For example, two resin films are laminated (laminated), and the three edges are joined to form a bag. It is a body structure. The resin film may be translucent, or may have opaque printing or light-shielding properties due to thin-film deposition of aluminum or the like. Further, characters and designs may be attached to the outer surfaces of the two resin films.

Here, examples of the defective portion of the three-sided bag ST to be detected by the inspection device 1 include pinholes, scratches, foreign substances, uneven printing, fish eyes, contamination of fibers, hair, and the like.

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

The first transport unit 210 has a configuration in which the transport means 210A, the transport means 210B, and the transport means 210C are arranged in series in the transport direction through a predetermined gap, and the second transport unit 220 has the transport means 220A, Similarly, the transport means 220B and the transport means 220C are arranged in series in the transport direction through a predetermined gap.

By operating the transport means 210A, 210B, 210C in conjunction with each other, the three-way bag ST is transported in the M1 direction to the peripheral surface (cylindrical surface) of the rotary drum 311 of the first rotary transport unit 310, and the transport means 220A. , 220B and 220C operate in conjunction with each other to convey the three-sided bag ST in the M2 direction to the peripheral surface (cylindrical surface) of the rotary drum 321 of the second rotary transfer unit 320.

Further, the first transport unit 210 includes transport belts 211A, 211B, 211C (hereinafter collectively referred to as “convey belt 211”), pulleys 212A, 212B, 212C (hereinafter collectively referred to as “pulley 212”), 213A, 213B, 213C (hereinafter, collectively referred to as "pulley 213"), pressing rollers 214A, 214B, 214C (hereinafter, collectively referred to as "pressing roller 214") are provided.

Similarly, the transport unit 220 includes transport belts 221A, 221B, 221C (hereinafter collectively referred to as "convey belt 221"), pulleys 222A, 222B, 222C (hereinafter, collectively referred to as "pulley 222"), 223A, and the like. 223B, 223C (hereinafter, collectively referred to as "pulley 223"), holding rollers 224A, 224B, 224C (hereinafter, collectively referred to as "holding roller 224").

The transport belts 211 and 221 are belts that hold the three-way bag ST on the upper surface and carry the belts, and are suspended between the pulleys 212 and 213 and between the pulleys 222 and 223, respectively. The 222, 223, are driven and controlled by the device drive control unit (not shown) to convey the three-way bag ST.

Here, in order to ensure that the three-way bag ST is held by the transport belts 211 and 221, for example, a plurality of intake holes (not shown) in the transport belt and a suction device that sucks air from the intake ports (not shown). (Shown) may be provided so that the three-way bag ST placed on the transport belts 211 and 221 is suction-adsorbed to securely hold and transport the three-way bag ST.

Further, the pressing rollers 214 and 224 are each for satisfactorily holding the three-way bag ST on the transport belt when the three-way bag ST is transferred between the transport belts, and are appropriately held as necessary. , Should be provided.

Next, the first rotary transport unit 310 is a mechanism that receives the three-way bag ST from the first transport unit 210, peripherally transports it in the M3 direction, and delivers it to the second transport unit 220. This is a mechanism that receives the three-way bag ST from the second transport unit 220, transports it around in the M4 direction, and delivers it to the third transport unit 710.

The first rotary transport unit 310 includes a rotary drum 311 and a pressing roller 312, and the second rotary transport unit 320 includes a rotary drum 321 and a press roller 322. The rotary drums 311 and 321 are rotary drums that hold and rotate the three-way bag ST on the surface (peripheral surface) by, for example, suction and suction. The rotating drums 311 and 321 are provided with a plurality of intake holes (not shown) on their peripheral surfaces, and gas on the peripheral surface is sucked from the inside of the rotating drums 311 and 321 through the intake holes (not shown). As a result, the three-way bag ST on the peripheral surface is sucked and sucked and held.

The pressing rollers 312 and 322 satisfactorily hold the three-way bag ST on the peripheral surfaces of the rotating drums 311 and 321 when the three-way bag ST is delivered from the transport belts 211C and 221C to the rotating drums 311 and 321. It is for tightening, and may be provided as needed.

Next, the color transmission image acquisition units 410 and 420 are image acquisition means for acquiring a color transmission image with the conveyed three-way bag ST as an imaging target within the transfer range of the transfer units 210 and 220, and are predetermined gaps. A color transmission image acquisition unit 410 is arranged between the transportation means 210A and the transportation means 210B, and a color transmission image acquisition unit 420 is arranged between the transportation means 220A and the transportation means 220B. However, each is provided.

The color transmission image acquisition unit 410 includes a color light source unit 411 and an image pickup unit 412, and is provided so as to face each other with the transfer unit 210 at a position (Lx1) between the transfer means 210A and 210B.

The color transmission image acquisition unit 420 includes a color light source unit 421 and an image pickup unit 422, and is provided so as to face each other with the transport unit 220 at a position (Lx2) between the transport means 220A and 220B. According to the above configuration, the color transmission image acquisition units 410 and 420 acquire transmission images from different surfaces with respect to the three-sided bag ST.

Further, the monochrome transparent image acquisition units 510 and 520 are image acquisition means for acquiring a monochrome transparent image with the three-sided bag ST to be conveyed as an imaging target within the transfer range of the transfer units 210 and 220, and have a predetermined gap. A monochrome transparent image acquisition unit 510 is provided between the transfer means 210A and the transfer means 210B, and a monochrome transparent image acquisition unit 520 is arranged between the transfer means 220A and the transfer means 220B, which are arranged in series in the transfer direction. However, each is provided.

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

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

According to the above configuration, the monochrome transparent image acquisition units 510 and 520 acquire transparent images from different surfaces with respect to the three-sided bag ST.

Here, the image pickup locations of the transmission images by the color transmission image acquisition units 410 and 420 and the monochrome transmission image acquisition units 510 and 520 are the transfer belt and the transfer belt arranged in series in the transfer direction through a predetermined gap. It is a place (Lx1, Ly1, Lx2, Ly2) between and, where there is no transport belt, that is, a "cut" in the transport belt.

Therefore, in order to perform good imaging at each location of Lx1, Ly1, Lx2, Ly2, the transfer of the three-way bag ST between the transfer belts is good, that is, the three-way bag held by the transfer belt on the upstream side. After the tip of the bag ST passes through the cut (the predetermined gap) and reaches the transport belt on the downstream side, it is necessary that the bag ST is continuously attracted and held well on the transport belt on the downstream side as well.

This is because in the case of a single-wafer type form such as the three-sided bag ST, the shape itself is accompanied by a deformed shape such as "waviness" or "warp", so when it passes through the "cut" of the transport belt, it is on the downstream side. If the suction and retention on the transport belt is not well maintained, the position of the three-sided bag ST at the imaging location (Lx1, Ly1, Lx2, Ly2) may vary, which may hinder the acquisition of a transmitted image. Because.

However, according to the above-described embodiment, when the three-way bag ST is delivered from the upstream transport belt to the downstream transport belt, the holding rollers 214 and 224 are present, so that the downstream transport is carried out. The three-way bag ST is well held even on the belt, and therefore, the position of the three-way bag ST in the Z direction at the imaging position (Lx1, Ly1, Lx2, Ly2) is in a stable state in which variation is suppressed, that is, The position is almost the same as the position of the transport belt, so that a good transmission image can be taken. Next, the reflection image acquisition units 610 and 620 will be described. The reflection image acquisition units 610 and 620 have light source units 611 and 621 and imaging units 621 and 622, and are transported within the transport range of the first rotation transport unit 310 and the second rotation transport unit 320. It is a means for acquiring a monochrome reflection image or a color reflection image at an imaging position (L3, L4) with the three-sided bag ST as an imaging target, and is an optical axis of the light source units 611 and 621 and an imaging axis of the imaging units 612 and 622. If the angle θ formed by the light source is tilted by an angle close to a sharp angle, it can be imaged as a state in which light is specularly reflected, and if it is arranged tilted by an angle close to an blunt angle, it can be imaged as a state in which diffused light is irradiated. can.

Here, when the three-sided bag ST is supplied in a single-wafer type, the shape of the three-sided bag ST includes factors such as waviness and warpage that hinder the acquisition of a reflected image. According to the above-described embodiment, since the three-way bag ST is attracted and held on the cylindrical surface which is the peripheral surface of the rotating drums 311 and 321, the shape of the three-sided bag ST is formed on the cylindrical surface of the rotating drums 311 and 321. Therefore, the waviness and warpage of the three-sided bag ST itself will be reduced to the extent that it does not hinder the acquisition of the reflected image, and the distance between the three-way bag ST itself and the reflected image acquisition units 610 and 620 will also be reduced. The rotating drums 311 and 321 and the reflection image acquisition units 610 and 620 "become substantially stable at their respective intervals, so that a good reflection image can be captured.

Then, a known method (for example, filtering process, difference process, etc.) is applied to the image (monochrome, color, transmission, reflection) obtained by imaging the three-sided bag ST with the inspection device 1 having the above-described configuration. By doing so, defective parts (pinholes, scratches, foreign substances, fish eyes, etc.) are detected (particularly, detection after distinguishing from the print design applied to the three-sided bag ST), and the defective part is provided on it. All you have to do is identify the three-sided bag and separate it from non-defective products with no defects.

Specifically, the third transport unit 710 includes a transport belt 711, pulleys 712, and 713, and the transport belt 711 suspended between the pulleys 712 and 713 is driven and controlled by a device drive control unit (not shown). As a result, the three-way bag ST is conveyed to the defective bag discharge unit 720. The defective bag discharging unit 720 includes a transport belt 721, pulleys 722, and 723, and is driven and controlled by a device drive control unit (not shown). Is transported to the finished product carry-out unit 730. On the other hand, when the three-way bag ST is a defective bag containing a defect, the pulley 723 moves downward around the pulley 724 as the center of rotation to change the transport path, and the defective bag is discharged to the tray 724. The finished product carry-out unit 730 is provided with a transport belt 731, pulleys 732, and 733, and is driven and controlled by a device drive control unit (not shown) to discharge a non-defective finished product to the tray 734.

Here, as the transmission image acquisition units 410, 510, 420, 520 and the reflection image acquisition units 610 and 620 in the above description, for example, a 1-trigger 3-scan system manufactured by CCS Inc. can be used. .. This is a system in which three light sources are switched on and lit at high speed for each scan of the line camera to take images. Conventionally, three cameras were required for three inspection stages, but one image was taken for each stage. With the camera, it can be realized almost at the same time (at most, the time delay within the time of one scan of the line camera). Images of R, G, and B colors taken at almost the same timing by using three light sources of R, G, and B as the three light sources and by making the brightness of the monochrome light source part different in three stages. Or, it is possible to obtain a monochrome image having three different brightness levels. If the image obtained by this is used, it is suitable to detect the defective portion with high accuracy.

≪Modification example≫
In the above-described embodiment, in order to obtain a monochrome image having different brightness in several steps, an example is shown in which the brightness of the W light source is different in one scan of the line camera, and images are taken. The modified example of the embodiment shows another aspect.

That is, in FIG. 3A, when one scan of the line camera is started by the trigger signal (Tr), the brightness of the monochrome light source unit is synchronized with the trigger signal (Tr) during one scan of the line camera. (V1) -By making the exposure time of the line camera different (T1, T2, T3) without changing the light emission time (T1), a monochrome image having three different brightness levels can be obtained. In FIG. 3B, when one scan of the line camera is started by the trigger signal (Tr), the brightness of the monochrome light source unit is synchronized with the trigger signal (Tr) during one scan of the line camera. (V1) does not change, but the brightness differs in three stages by synchronizing the light emission time (T1, T2, T3) and the exposure time of the line camera (T1, T2, T3) and taking different images. It shows an aspect of obtaining a monochrome image.

According to the above aspect, the effect of obtaining a monochrome image having several steps of brightness can be realized even by using a general monochrome light source, as compared with the aspect of capturing images with different brightness of the monochrome light source unit. Therefore, it can be realized at a lower cost.

The above-mentioned inspection apparatus and inspection method for the film laminate according to the above-described embodiments and modifications of the present disclosure are limited to the above-described embodiments and modifications except for their essential characteristic components. I don't receive it. For example, the present disclosure also includes a form obtained by subjecting various modifications to the embodiment that a person skilled in the art can think of, and a form realized by arbitrarily combining components and functions within a range that does not deviate from the gist of the present invention. Is done.

The film laminate inspection apparatus and inspection method according to one aspect of the present disclosure can be widely used, for example, in the manufacturing process of a three-sided bag for packaging pharmaceuticals, medical instruments, processed foods, confectionery, daily necessities, and the like. It can also be suitably used as a part of a packaging device using a film laminate such as a three-sided bag.

1 Film laminate inspection device 210 1st transport unit 210A, 210B, 210C Transport means, transport means, transport means 211A, 211B, 211C Transport suction belt 212A, 212B, 212C Pulley 213A, 213B, 213C Pulley 214A, 214B, 214C Holding Roller 220 Second Transporting Unit 220A, 220B, 220C Transporting Means, Transporting Means, Transporting Means 221A, 221B, 221C Transport Suction Belt 222A, 222B, 222C Pulley 223A, 223B, 223C Pulley 224A, 224B, 224C Pressing Roller 310 First Rotating transport unit 311 Rotating drum 312 Pressing roller 320 Second rotating transport unit 321 Rotating drum 322 Pressing 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 Reflected image acquisition unit 611 Light source unit 612 Imaging unit 620 Reflected image acquisition unit 621 Light source unit 622 Imaging unit 710 Transport unit 711 Adsorption Belt 712 Pulley 713 Pulley 720 Defective bag discharge part 721 Suction belt 722 Pulley 723 Pulley 724 Tray 730 Finished product carry-out part 731 Suction belt 732 Pulley 733 Pulley 734 Tray

Claims (2)

It is an inspection device for film laminates supplied as a single sheet.
The first transport section and the second transport section that transport the film laminate,
A first transmitted image acquisition unit that acquires a first transmitted image by transmitted light from the first surface side of the film laminate transported by the first transport unit, and a first transmitted image acquisition unit.
A second transmitted image acquisition unit that acquires an image by transmitted light from the side of the second surface that faces the first surface of the film laminate conveyed by the second conveying unit.
A first rotation transporting unit that rotates by placing the film laminate on the peripheral surface with the first surface facing outward, and the three-sided bag on the peripheral surface with the second surface facing outward. The second rotary transport unit that is placed and rotated, and
A first reflected image acquisition unit that acquires an image by reflected light from the side of the first surface of the three-sided bag that is circumferentially conveyed by the first rotation transfer unit.
A second reflected image acquisition unit that acquires an image by reflected light from the side of the second surface of the three-sided bag that is circumferentially conveyed by the second rotation transfer unit.
With
An inspection device for a film laminate that detects 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. This is an inspection method for film laminates supplied as single leaves.
The process of transporting the film laminate by the first transport section and the second transport section, and
A step of acquiring a first transmitted image by transmitted light from the first surface side of the film laminate transported by the first transport unit by the first transmitted image acquisition unit.
A step of acquiring an image by transmitted light from the side of the second surface of the film laminate transported by the second transport unit, which is opposite to the first surface, by the second transmitted image acquisition unit.
A step of placing and rotating the film laminate on the peripheral surface with the first surface facing outward by the first rotary transport unit, and a step of rotating the three-sided bag with the second surface by the second rotary transport unit. The process of placing and rotating on the peripheral surface toward the outer circumference,
A step of acquiring an image due to reflected light from the side of the first surface of the three-sided bag that is circumferentially conveyed by the first rotary transport unit by the first reflected image acquisition unit.
A step of acquiring an image due to reflected light from the side of the second surface of the three-sided bag that is circumferentially conveyed by the second rotary transport unit by the second reflected image acquisition unit.
With
A method for inspecting a film laminate that detects 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.

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