JP2022138589A - Inspection device for package product and inspection method for package product - Google Patents

Abstract

To provide an inspection device for a package product, capable of detecting the sealing failure of a package product with high accuracy by suppressing the temperature change of a conveyance belt or by changing the surface temperature of the package product uniformly.SOLUTION: An inspection device 1 for detecting the sealing failure of a package product 200 with an opening of a container sealed includes a conveyance unit 10 having a conveyance surface 10a and configured to convey the package product 200 mounted on the conveyance surface 10a, a blowing unit 20 that changes the temperature of the package product 200 by supplying temperature-conditioned air to the package product 200 conveyed by the conveyance unit 10 with the temperature-conditioned air blown in parallel to the conveyance unit 10a, and a detection unit 30 that detects the distribution of the surface temperature of the package product 200 with the temperature changed by the supply of the temperature-conditioned air.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an inspection apparatus and an inspection method for a package whose opening of a container is sealed, and more particularly to an inspection apparatus and an inspection method for a package for inspecting sealing defects of a container.

As a technique for inspecting sealing defects of a packaged product in which the opening of a container containing contents is sealed, there is a technique disclosed in Patent Document 1 below. In Patent Document 1, in the process of transporting a package comprising a container body and a lid that seals the opening of the container body, heat is applied to change the temperature of the lid of the package, and an infrared camera is used. A technique is described in which a thermographic image representing the surface temperature distribution of the lid is captured using a thermography, and defects in the container body, the lid, and the seal portion are detected based on this image. Further, in Patent Document 1, a heat application device that causes a temperature change in the lid of the package is arranged facing the conveying surface of the conveyor belt that conveys the package, and the package is heated by radiant heat transfer or convection heat transfer. It is stated that heat is applied to the lid of the

Japanese Patent Application Laid-Open No. 2020-041840

However, as described above, in the case of simply heating by a heat applying device arranged opposite to the conveying surface of the conveying belt, the conveying belt is heated by radiant heat transfer or convective heat transfer, and the packages and the conveying surface as the background are heated. The problem arises that the temperature difference between the two cannot be secured. If the temperature difference cannot be ensured, it becomes difficult to distinguish between the packaged product and the background. As a countermeasure, Patent Document 1 describes providing a blower as a means for adjusting the temperature of the conveying belt, and separating the conveying belt facing the heat imparting device from the conveying belt facing the infrared camera. However, it is necessary to install a blower and separate the conveyor belt.

In addition, heating by a heat applying device arranged opposite to the conveying surface of the conveying belt causes temperature unevenness in the packaged product, and this temperature unevenness is reflected in the thermographic image, which reduces the detection accuracy of the sealing failure part. was there. In particular, in the case of heating by radiant heat transfer, temperature unevenness may occur due to differences in heat absorption due to printed colors and materials printed on the surface to which heat is applied. Moreover, even with heating by convective heat transfer, non-uniform heating and cooling may occur due to airflow caused by movement of the package product to be inspected, resulting in uneven temperature.

Therefore, the present invention is an inspection of packaged products capable of detecting sealing failures of packaged products with high accuracy by suppressing temperature changes of a conveyor belt and evenly changing the surface temperature of packaged products. An object of the present invention is to provide an inspection method for an apparatus and a packaged product.

In order to achieve such an object, the present invention provides an inspection apparatus for inspecting sealing defects of a packaged product in which the opening of a container is sealed, the inspection apparatus having a conveying surface and a container placed on the conveying surface. a conveying unit for conveying the packaged product, and blowing temperature-controlled air parallel to the conveying surface to supply the temperature-controlled air to the packaged product conveyed by the conveying unit, thereby adjusting the temperature of the packaged product. and a detection unit for detecting the distribution of the surface temperature of the packaged product whose temperature is changed by the supply of the temperature-controlled air.

According to the present invention, by suppressing the temperature change of the conveyor belt, and by uniformly changing the surface temperature of the package, it is possible to detect the sealing failure of the package with high accuracy. An inspection device and a package inspection method can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram (part 1) for explaining the configuration of an inspection apparatus for packaged goods according to an embodiment; 1 is a schematic plan view for explaining the configuration of a main part of an inspection device for packaged goods according to an embodiment; FIG. FIG. 2 is a schematic diagram (part 2) for explaining the configuration of the package inspection apparatus according to the embodiment; It is a schematic diagram for demonstrating the structure of the inspection apparatus of the package goods which concerns on the modification of embodiment. FIG. 11 is a schematic diagram for explaining the configuration of a package inspection apparatus according to another modification of the embodiment; It is an infrared image for demonstrating the effect of embodiment. It is an infrared image of a comparative example of the embodiment. It is a graph which shows distribution of the surface temperature for demonstrating the effect of embodiment. 7 is a graph showing temperature changes of the conveying surface for explaining the effect of the embodiment; 7 is a graph showing the flow velocity distribution of temperature-controlled air with respect to the height distance from the guide member for explaining the effect of the embodiment; 5 is a graph showing the relationship between the distance from the blowout port and the flow velocity of temperature-controlled air for each height distance from the guide member, for explaining the effect of the embodiment. 5 is a graph showing the relationship between the height distance from the guide member and the flow velocity of temperature-controlled air for each distance from the blowout port, for explaining the effect of the embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a package inspection apparatus and a package inspection method according to the present invention will be described below with reference to the drawings.

≪Inspection equipment for packaged products≫
FIG. 1 is a schematic diagram (Part 1) for explaining the configuration of an inspection apparatus 1 for a packaged product 200 according to an embodiment. FIG. 2 is a schematic plan view for explaining the configuration of the essential parts of the inspection apparatus 1 for the packaged goods 200 according to the embodiment, and is a view of the essential parts of FIG. 1 as seen from above. The inspection apparatus for the package 200 shown in these figures (hereinafter simply referred to as inspection apparatus 1) is an apparatus for detecting sealing defects in the package 200. FIG. Before describing the configuration of the inspection apparatus 1, the configuration of the package 200 to be inspected will be described below.

- Configuration of package product 200 -
The package 200 to be inspected by the inspection apparatus 1 is in a state in which the opening of the container containing the content [A] is sealed. Such a packaged product 200 is, for example, like cup noodles, and is composed of a container main body 201 containing contents [A] such as noodles and a medicinal bag, and a lid 202 closing the opening of the container. are exemplified.

The container body 201 is cup-shaped with an opening at the top. The material of the container body 201 is exemplified by foamed or non-foamed plastics, papers, and the like. Further, the lid 202 is a sheet-like member provided to cover the opening of the container body 201, and may have a grip portion 202a (see FIG. 2) for peeling off the lid 202 from the container body 201 in some cases. The material of the lid 202 can be made of plastic, paper, or a cap seal obtained by laminating these and aluminum foil, but is not limited to these. The present invention can be effectively applied to impermeable objects.

The package 200 including the container body 201 and the lid 202 is sealed, for example, by bonding the periphery of the opening of the container body 201 and the periphery of the lid 202 as illustrated. The bonding method is appropriately selected from various methods such as thermocompression bonding and ultrasonic vibration depending on the material of the container body 201 and the lid 202. For example, when plastic is used, thermocompression bonding is selected. be.

In the package 200 as described above, part of the contents [A] is caught in the bonded portion 200a between the container body 201 and the lid 202, or part of the sheet-like lid 202 is twisted and caught. may be included. A portion where such a foreign matter (here, a portion of the lid 202 is also assumed to be a foreign matter) is caught becomes an adhesion failure portion 200x (see FIG. 2) between the container body 201 and the lid 202, and such a foreign matter is caught. The occurrence causes a sealing failure of the packaged product 200 . In addition, when part of the contents [A] (for example, the end of the drug bag [A1]) is bitten into the bonding portion 200a between the container body 201 and the lid 202 and the bonding process is performed, the contents [ A] is not adhered. Therefore, the content [A] (for example, the drug bag [A1]) bitten into the inside of the container body 201 may drop due to vibration or the like. A cavity is formed in the Furthermore, depending on the state of the sealing device, even if a sealing failure is caused between the container body 201 and the lid 202, a cavity is formed. These cavities also cause a sealing failure of the packaged product 200 .

Note that the package 200 to be inspected by the inspection apparatus 1 is not limited to the one provided with the container body 201 and the lid 202 as illustrated, and the opening of the container containing the contents [A] is widely applicable to sealed structures. FIG. 3 is a schematic diagram (part 2) for explaining the configuration of the inspection apparatus 1 for the packaged product 200 according to the embodiment. As shown in this figure, another configuration example of the packaged product 200 is one that uses a bag-like container 203 made of a flexible sheet material like a candy bag. The bag-shaped container 203 has a configuration in which the bag-shaped edges facing each other at the opening edge for containing the content [A] are bonded by thermocompression bonding, ultrasonic vibration, or the like, and the bonding method is appropriately selected. may be the method selected for Even in this case, the occurrence of sealing failure due to the occurrence of foreign matter being caught in the bonding portion or the occurrence of bonding failure such as non-bonding is the same.

The inspection apparatus 1 is an apparatus for detecting a sealing failure of the packaged product 200 as described above, and includes a conveying section 10 , an air blowing section 20 and a detecting section 30 . Next, the details of each of these constituent elements will be described in order.

<Conveyor 10>
The conveying unit 10 is a device portion for conveying the packaged goods 200, and is configured by, for example, a belt conveying device. The conveying unit 10 has a configuration in which an endless belt 13 is stretched between a driving roller 12 driven in one direction and a driven roller 11 . The conveying unit 10 has the conveying surface 10a, which is the upper surface of the outer peripheral surface of the endless belt 13, and conveys the package 200 placed on the conveying surface 10a in the moving direction of the conveying surface 10a. Therefore, the moving direction of the conveying surface 10a is the conveying direction [x1] of the package 200. As shown in FIG. Such a conveying unit 10 conveys the packaged product 200 with the adhesive portion 200a facing upward.

Note that the transport unit 10 may be a combination of a plurality of belt transport devices. Further, the conveying unit 10 is not limited to a belt conveying device, and may be, for example, a roller conveying device in which a plurality of rollers are arranged in the conveying direction [x].

<Blower 20>
The air blowing unit 20 is a device part that blows temperature-controlled air [w] temperature-controlled so as to change the surface temperature of the packaged product 200 to the packaged product 200 transported by the transporting unit 10 in a predetermined state. Such a blowing unit 20 includes, for example, a blowing nozzle 21 that blows out temperature-controlled air [w], a holding member 22 , a guide member 23 , and a blowing recovery unit 24 .

[Blower nozzle 21]
The blower nozzle 21 has a blowout port 21a for blowing out temperature-controlled air [w]. The blowout port 21a of the air blow nozzle 21 is located on the surface of the package 200, more specifically, the surface (upper surface) of the package 200 conveyed by the conveying unit 10 that faces upward and includes the adhesive portion 200a. , so that the temperature-controlled air [w] is supplied to the entire surface of the conveying surface 10a.

As shown in FIG. 2 as an example, such a blowout port 21a is arranged over a width direction length [y] perpendicular to the transport direction [x1] on the transport surface 10a. It is assumed that temperature-controlled air [w] is blown out over [y].

As an example of the blower nozzle 21 having the blowout port 21a as described above, a configuration in which an adjusting plate 21b is attached to the blowout port 21a is exemplified (see FIGS. 1 and 3). The adjustment plate 21b is for controlling the flow velocity and the flow velocity distribution of the temperature-controlled air [w] blown out from the outlet 21a, depending on the mounting angle.

Also, the mounting angle of the adjusting plate 21b is set within a range in which the temperature-controlled air [w] is blown out from the outlet 21a parallel to the conveying surface 10a. Here, "parallel to the conveying surface 10a" means that the temperature-controlled air [w] blown out from the blowing nozzle 21 is supplied to the package 200, but is not supplied to the conveying surface 10a. , is not limited to being completely parallel to the conveying surface 10a.

The adjusting plate 21b narrows the substantial opening area of the blowing port 21a, thereby increasing the blowing speed of the temperature-controlled air [w]. Therefore, the adjustment plate 21b can apply the temperature control air [w] to the upper surface of the packaged product 200, and can heat or cool the upper surface of the packaged product 200. FIG.

1 to 3, in the direction opposite to the 200 conveying direction [x1] of the packaged product by the conveying unit 10, the temperature controlled air [ A configuration is shown in which the adjustment plate 21b is attached so that [w] is blown out.

However, the blowing direction of the temperature control air [w] is not limited to this. Here, the blowing direction of the temperature-controlled air [w] is the blowing direction of the temperature-controlled air [w] when the conveying surface 10a is viewed from above. The blowing direction of the temperature-controlled air [w] may be any range as long as it does not affect detection by the detection unit 30 described below and can appropriately heat or cool the upper surface of the packaged product. For example, the air blower 20 may be arranged at a position rotated from the upstream direction in the transport direction [x1] of the package 200 within a plane parallel to the transport surface 10a.

Also, the temperature-controlled air [w] blown out by the air blow nozzle 21 is a gas whose temperature is adjusted so as to change the temperature of the package 200 to a predetermined state, and is cold air or hot air. Such temperature-controlled air [w] is typically warm air and heats the package 200 . Further, changing the temperature of the packaged product 200 to a predetermined state means that the detection unit 30 described below can detect the "temperature difference" between the adhesion failure portion 200x and other portions of the adhesion portion 200a. , at least the bonding portion 200 a of the package 200 is heated or cooled. The "temperature difference" detected by the detection unit 30 depends on the change in heat capacity caused by the presence of foreign matter or non-adhesion space in the adhesion failure location 200x.

[Holding member 22]
The holding member 22 (see FIGS. 1 and 3) holds the blower nozzle 21 . The height position of this holding member 22 is adjustable. As a result, the height of the blowing port 21a of the blowing nozzle 21 relative to the conveying surface 10a, that is, the blowing height of the temperature-adjusted air [w] is controlled by the height position of the holding member 22 . Control of the blowing height of the temperature-adjusted air [w] by the holding member 22 depends, for example, on the height [h] of the packaged product 200. The height of the blowout port 21a of the blower nozzle 21 is increased.

[Guide member 23]
The guide member 23 is for maintaining the controlled flow velocity and flow velocity distribution of the temperature-adjusted air [w]. Such a guide member is arranged in the blowing direction of the temperature-controlled air [w] in the air blowing section 20, and parallel to the conveying surface 10a of the conveying section 10 at the height position of the upper end of the blowing port 21a of the blowing nozzle 21. is installed in

Here, FIG. 4 is a schematic diagram for explaining the configuration of the package inspection apparatus 2 according to the modification of the embodiment. As shown in FIG. 4, the guide member 23' provided in the blowing section 20' is constituted by the lower surface of the holding member 22, and the lower surface of the holding member 22 may also serve as the guide member 23'.

FIG. 5 is a schematic diagram for explaining the configuration of a package inspection apparatus 3 according to another modification of the embodiment. As shown in FIG. 5, the guide member 23 ″ provided in the air blowing section 20 ″ has an extension length with respect to the blowing direction of the temperature-controlled air [w], that is, an extension along the transport direction [x1] of the transport surface 10 a. A mechanism for varying the length in the direction may be provided. This makes it possible to change the time during which the temperature-controlled air [w] is maintained parallel to the conveying surface 10a. That is, the length of the guide member 23″ in the extending direction along the conveying surface 10a is lengthened, thereby increasing the time during which the temperature-controlled air [w] is maintained parallel to the conveying surface 10a. can be done.

Further, the guide member 23 ″ provided in the air blowing section 20 ″ may have a mechanism for varying the arrangement angle with respect to the conveying surface 10 a by moving the distal end in the blowing direction of the temperature-controlled air [w]. As a result, it is possible to change the flow velocity and flow velocity distribution of the hot air [w], and it is possible to adjust the heating time and heating amount of the package product 200 to be inspected and control the temperature.

[Blowing recovery unit 24]
Returning to FIGS. 1 and 3, the air recovery unit 24 recovers the temperature-controlled air [w] blown out from the air nozzle 21 on the downstream side of the guide member 23 with respect to the blowing direction of the temperature-controlled air [w], and blows the air. It is for supplying to the blower nozzle 21 of the unit 20 . Such an air recovery unit 24 has a recovery port 24a on the downstream side of the guide member 23 with respect to the blowing direction of the temperature-controlled air [w]. It has a flow path 24 b for returning to the nozzle 21 . The guide member 23 may be used as part of the flow path 24b. By providing such a blown air recovery unit 24, it becomes possible to recover and reuse the temperature-controlled air [w].

4 and 5, the air blow recovery unit 24 is not an essential component, and is not shown in FIGS. It may be installed in the inspection device 3 having the configuration described above.

<Detector 30>
The detection unit 30 is a device part that detects the surface temperature distribution of the packaged product 200 to which the temperature-controlled air [w] is blown by the blower unit 20 . Such a detection unit 30 includes an infrared camera 31 disposed downstream of the air blowing unit 20 in the transport direction [x1] of the package 200 by the transport unit 10, and an output for outputting an image obtained by the infrared camera 31. a portion 32;

The infrared camera 31 is capable of capturing an infrared image in which the lid 202 of the package 200 conveyed by the conveying section 10 is within the imaging field of view.

The output unit 32 is, for example, a display device having a recording medium, and shows the temperature distribution of the conveying surface 10a and the upper surface of the package 200 placed on the conveying surface 10a based on the image obtained by the infrared camera 31. Output an infrared image.

Also, the detection unit 30 may include an analysis unit that detects a sealing failure of the packaged product 200 based on the image obtained by the infrared camera 31 . This analysis unit uses, for example, an image acquired from a packaged product 200 for which it has been confirmed that no sealing failure has occurred as a reference image, and compares this reference image with the image obtained by the infrared camera 31 to obtain the following: It is determined whether or not the package product 200 to be inspected has an adhesion failure portion 200x. Such an analysis unit is composed of a computer such as a microcomputer having an operation unit.

<<Inspection method for packaged goods>>
Next, a package product inspection method using the above inspection apparatus 1 will be described. First, for the purpose of properly heating or cooling the package 200, the height of the package 200 to be inspected is taken into consideration, and the height position of the blower nozzle 21 and the mounting angle of the adjustment plate 21b are adjusted. A preliminary inspection may be performed using the height of the blower nozzle 21 and the mounting angle of the adjusting plate 21b as factors.

After the above, the package 200 to be inspected is placed on the transport surface 10a of the transport unit 10, and the package 200 is transported in the transport direction [x1] by the transport unit 10. FIG. In the conveying process, temperature-controlled air [w] is blown out parallel to the conveying surface 10a from the outlet 21a of the blower nozzle 21 held at a predetermined height, and the temperature-controlled air [w] is blown to the conveying surface 10a. The temperature controlled air [w] is blown against the upper surface of the packaged product 200 while suppressing the blowing. As a result, the package 200 is heated or cooled by convection heat transfer while suppressing the temperature change of the conveying surface 10a, and the surface temperature of the upper surface of the package 200 is changed to a predetermined state. The blowing angle of the temperature-controlled air [w] adjusted by the mounting angle of the adjusting plate 21b is parallel to the conveying surface 10a. Here, "parallel" means a range in which the temperature control air [w] is not supplied to the conveying surface 10a.

Further, in the process of transportation in the transportation direction [x1] by the transportation unit 10, the infrared camera 31 of the detection unit 30 captures an infrared image of the package 200 after the temperature-controlled air [w] is blown by the air blower 20. An image is captured and output to the output unit 32 . Based on this infrared image, a sealing failure of the packaged product 200 is detected as follows.

That is, the surface temperature of the upper surface of the packaged product 200 to which the temperature control air [w] is blown changes depending on the heat capacity of each part. Therefore, if there is an adhesion failure portion 200x having a heat capacity different from that of other portions due to being caught or unbonded, the temperature distribution of the adhesion failure portion 200x differs from that of the other portions. Therefore, if there is a location with a different temperature distribution in the portion corresponding to the adhesive portion 200a in the infrared image, it is determined that the location is the adhesion failure location 200x and that the packaged product 200 has a sealing failure.

If the detection unit 30 of the inspection device 1 includes an analysis unit, the analysis unit compares a reference image obtained by the infrared camera 31 with a reference image when no sealing failure occurs, for example. determines whether or not the package product 200 to be inspected has an adhesion failure portion 200x, and outputs the determination result to the output unit 32. FIG.

<<Effects of the embodiment>>
In the inspection apparatus 1 and the inspection method of the embodiment described above, the adjustment plate 21b is provided at the outlet 21a of the air blow nozzle 21, so that the temperature-controlled air [ w]. As a result, the surface temperature of the upper surface of the package 200 is changed to a predetermined state by blowing the temperature control air [w] only on the package 200 while suppressing the temperature change due to the blowing of the temperature control air [w] to the conveying surface 10a. can be made As a result, it is possible to obtain an image with a clear contour of the package 200 to be inspected without making large-scale improvements such as installation of a blower and separation of the conveying belt, thereby preventing defective sealing of the package. It is possible to detect with high accuracy. In addition, with this configuration, it is possible to equalize the amount of temperature-controlled air [w] supplied to the upper surface of the packaged product 200, and the occurrence of uneven heating or cooling of the packaged product 200 by the air blower 20 is prevented. It is possible to improve the detection accuracy of the sealing failure of the package product 200 .

Here, FIG. 6 is an infrared image for explaining the effect of the embodiment. 1 is an infrared image obtained by inspection using the inspection device 1 that has been used. 7 is an infrared image of a comparative example, without applying the embodiment, removing the adjusting plate 21b from the inspection apparatus 1, and blowing the temperature-controlled air [w] perpendicularly to the conveying surface 10a of the conveying unit 10. It is an infrared image in the case of blowing and inspecting.

The package 200 used for inspection has a container body 201 made of foamed plastic, a lid 202 made of a cap seal obtained by laminating paper and aluminum foil, and these are bonded by thermocompression bonding. be. Also, there is a cavity between the contents and the lid 202 . In the package product 200 having such a configuration, the heat capacity of the container body 201 is as large as that of the cavity and the temperature does not easily change, while the heat capacity of the lid 202 is small and the temperature easily changes. In addition, this packaged product 200 has an adhesion failure point 200x in which a part of the drug bag (see FIG. 2), which is one of the contents, is bitten in one place of the adhesion part 200a. In this inspection, heated warm air was supplied from the air blowing unit 20 of the inspection apparatus 1 as temperature-controlled air [w].

As shown in FIG. 6, according to the infrared image obtained by the inspection using the inspection apparatus 1 of this embodiment, it can be seen that the lid 202 constituting the upper surface of the package 200 is heated uniformly. Further, in this infrared image, an adhesion failure point 200x having a heat capacity different from that of the surrounding area due to a portion of the drug bag, which is a type of content, being caught in the adhesion area 200a is heated to a temperature different from that of the surrounding area. It can be seen that it is clear as a place where As a result, it was confirmed that the application of the embodiment facilitates the detection of the adhesion failure point 200x and enables detection of the sealing failure of the packaged product 200 with high accuracy.

On the other hand, in the infrared image of FIG. 7 obtained by the inspection apparatus and inspection method to which the embodiment is not applied, the outline of the package 200 to be inspected is unclear due to the temperature change of the conveying surface 10a, and the package 200 is not clear. The lid 202 forming the upper surface is unevenly heated. This indicates that it is difficult to detect the adhesion failure point 200x.

FIG. 8 is a graph showing surface temperature distribution for explaining the effect of the embodiment, which is a temperature distribution graph based on information from an infrared camera. (1) shows the temperature distribution of the imaging section of the infrared camera when the embodiment is applied, showing the temperature at each position of AA in FIG. (2) is the temperature distribution of the imaging section of the infrared camera in the case of the comparative example, showing the temperature at each position of AA in FIG.

From this graph, the temperature distribution on the upper surface of the packaged product 200 is such that the temperature difference is in the range of 0.7° C. when the embodiment (1) is applied, and the temperature difference is 0.7° C. in the case of the comparative example (2). It was in the range of 2.6°C. Thus, by applying the embodiment, it is possible to uniformly heat the upper surface of the package 200 by providing the adjusting plate 21b and blowing out the temperature-controlled air [w] parallel to the conveying surface 10a.

Further, the difference between the average temperature of the upper surface of the packaged product 200 and the average temperature of the conveying surface 10a under the packaged product 200 is 3.1 when the embodiment (1) is applied. °C, and 1.2 °C in the case of the comparative example (2). Furthermore, since there is a temperature difference of up to 2.6° C. due to uneven heating or cooling at the outline of the package product, it is difficult to distinguish between the outline of the package product and the unevenness. As a result, by providing the adjustment plate 21b of the embodiment and blowing out the temperature-controlled air [w] parallel to the conveying surface 10a, the temperature-controlled air [w] is less likely to be supplied to the conveying surface 10a, and the inspection object Therefore, the temperature difference between the packaged product 200 and the conveying surface 10a can be increased.

As a result, in the infrared image obtained by applying the inspection apparatus and inspection method of the embodiment, the contour of the package 200 to be inspected becomes clear, and it was found that the adhesion failure point 200x can be easily detected. In other words, since the outline of the packaged product 200 is clear, it becomes easy to identify the bonding portion 200a, and it becomes easy to identify the defective bonding portion 200x occurring in the bonding portion 200a.

The effect of suppressing the temperature change of the conveying surface 10a can also be seen from the graph of FIG. FIG. 9 is a graph showing temperature changes of the transport surface 10a (see FIGS. 1 to 3) for explaining the effect of the embodiment. 1 is a graph showing changes in surface temperature (see FIGS. 1 to 3). (1) is the change in temperature of the transport surface 10a when the embodiment is applied, and (2) is the change in temperature of the transport surface 10a in the case of the comparative example.

From the graph of FIG. 9, the temperature of the transport surface 10a hardly changes even after the elapsed time of the inspection when the embodiment (1) is applied. increases with the elapsed time. Accordingly, by applying the embodiment and providing the adjusting plate 21b to blow out the temperature-controlled air [w] parallel to the conveying surface 10a, the temperature-controlled air [w] is less likely to be supplied to the conveying surface 10a. , the conveying surface 10a can be maintained at the initial temperature, and a large temperature difference can be maintained between the package product 200 to be inspected and the conveying surface 10a even after the inspection time has elapsed. As a result, it was confirmed that by applying the present embodiment, it is possible to stably detect the sealing failure of the packaged product 200 with high precision for a long period of time. Such an effect becomes more reliable by adjusting the height position of the blower nozzle 21 according to the height of the packaged product 200 .

FIG. 10 is a graph showing the flow velocity distribution of the temperature controlled air with respect to the height distance from the guide member 23 (see FIGS. 1 and 3) for explaining the effect of the embodiment. The guide member 23 is installed with a length of 105 mm in the blowing direction of the temperature-controlled air [w], and the blowing speed of the temperature-controlled air [w] is 8.9 m/s, and the blowing temperature of the temperature-controlled air [w] is 80. °C. As shown in FIG. 10, when the temperature-controlled air [w] is blown parallel to the conveying surface 10a, the temperature-controlled air [w] flows while maintaining a certain flow velocity at a height position close to the guide member 23. I understand. On the other hand, at a height close to the conveying surface 10a, the flow velocity of the temperature-controlled air [w] is almost zero, and the effect of restricting the supply of the temperature-controlled air [w] to the conveying surface 10a is obtained. Recognize.

FIG. 11 is a graph showing the relationship between the distance from the blowout port and the flow velocity of temperature-controlled air for each height distance from the guide member for explaining the effect of the embodiment. As shown in FIG. 11, when the height distance from the guide member is short, the flow velocity of the temperature-controlled air is maintained at a certain level even if the distance from the air outlet is large, and the effect is that the temperature-controlled air can be supplied for a long period of time. know what to expect. On the other hand, when the height distance from the guide member is far and the position is close to the conveying surface, the speed of the temperature-controlled air is slow regardless of the distance from the air outlet, and the temperature-controlled air [w] toward the conveying surface 10a is slow. It can be seen that the effect of restricting the supply is obtained.

FIG. 12 is a graph showing the relationship between the height distance from the guide member and the flow velocity of the temperature-controlled air for each distance from the outlet for explaining the effects of the embodiment. As shown in FIG. 12, regardless of the distance from the outlet, the flow velocity of the temperature-controlled air is low at positions far from the guide member and close to the conveying surface. I understand. As a result, by blowing out the temperature-controlled air [w] parallel to the conveying surface 10a, the effect of limiting the supply of the temperature-controlled air [w] to the conveying surface 10a and preventing the temperature change of the conveying surface 10a is obtained. It can be seen that it is obtained.

In addition, the present invention is not limited to the configuration of the above-described embodiment, and further includes various modifications. For example, in the above-described embodiment, the configuration in which the adjustment plate is provided has been described. never As an example of this, for example, the blower nozzle 21 itself may be arranged parallel to the conveying surface 10a. However, if the structure is provided with the adjustment plate 21b, the effect of the present application can be obtained simply by attaching the adjustment plate to the existing inspection device that blows the temperature-controlled air perpendicularly to the conveying surface 10a. Also, the above-described embodiments are detailed descriptions for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations.

DESCRIPTION OF SYMBOLS 1, 2, 3... Inspection apparatus 10... Conveying part 10a... Conveying surface 20, 20', 20"... Blower part 21... Blower nozzle 21a... Blowout port 21b... Adjustment plate 22... Holding member 23, 23', 23"... Guide member 24 Blowing and collecting unit 30 Detecting unit 31 Infrared camera 32 Output unit 200 Package 201 Container main body (container)
202 Lid (container)
203 container

Claims (14)

An inspection device for inspecting sealing defects of a packaged product in which the opening of the container is sealed,
a conveying unit having a conveying surface and conveying packages placed on the conveying surface;
an air blowing unit that blows temperature-controlled air parallel to the conveying surface to supply the temperature-controlled air to the packaged product conveyed by the conveying unit to change the temperature of the packaged product;
and a detection unit that detects distribution of the surface temperature of the packaged product, the temperature of which is changed by the supply of the temperature-controlled air. The inspection apparatus according to claim 1, wherein the air blowing unit blows the temperature-controlled air in a direction opposite to a direction in which the package is conveyed by the conveying unit. 3. The blowing unit comprises a blowing nozzle having an outlet for blowing out the temperature-controlled air, and an adjustment plate attached to the outlet for controlling the flow velocity and flow velocity distribution of the temperature-controlled air. The inspection device described in . The inspection device according to claim 3, wherein the adjustment plate is installed so as to narrow the blowout port of the blow nozzle. The inspection apparatus according to any one of claims 1 to 4, further comprising a guide member for maintaining the blowing direction of the temperature-controlled air blown from the air blower. 6. The inspection apparatus according to claim 5, wherein the guide member has a mechanism for varying an extension length in the blowing direction of the temperature-controlled air. 7. The inspection apparatus according to claim 5, wherein the guide member has a mechanism for varying an arrangement angle with respect to the conveying surface by moving a distal end of the guide member in a blowing direction of the temperature-controlled air. 8. Among claims 5 to 7, further comprising an air recovery unit for recovering the temperature-controlled air from the downstream side of the guide member in the blowing direction of the temperature-controlled air in the air blower and supplying it to the air blower. The inspection device according to any one of . The detection unit is
an infrared camera that captures an image of the packaged product;
The inspection apparatus according to any one of claims 1 to 8, further comprising an output unit that outputs an image obtained by the infrared camera. The detection unit is
The inspection apparatus according to claim 9, further comprising an analysis unit that detects a sealing defect of the package based on the image obtained by the infrared camera. The inspection apparatus according to any one of claims 1 to 10, wherein the air blowing unit heats the packaged product with the temperature-controlled air. The air blower is
a blowing nozzle for blowing out the temperature-controlled air;
The inspection apparatus according to any one of claims 1 to 11, further comprising a holding section that controls the height position of the blowing nozzle to vary the blowing height of the temperature-controlled air. The package product comprises a container body having an opening at the top, and a lid for sealing the opening of the container body,
The inspection device according to any one of claims 1 to 12, wherein the detection unit detects temperature distribution of the lid. An inspection method for inspecting sealing defects of a packaged product in which the opening of the container is sealed,
transporting the package placed on the transport surface by a transport unit having a transport surface;
blowing out temperature-controlled air parallel to the conveying surface from an air blower to supply the temperature-controlled air to the packaged goods conveyed by the conveying part to change the temperature of the packaged goods;
An inspection method, wherein a detection unit detects a surface temperature distribution of a package to which the temperature-controlled air is blown by the blower unit.

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