Device for detecting abnormalities in the heat-sealed portion of a bag-shaped material, bag manufacturing equipment, and bag manufacturing method.

Abstract

To provide an apparatus, bag manufacturing equipment, and bag manufacturing method that can efficiently and effectively detect abnormalities in the heat-sealed parts of bag-shaped materials with good workability. [Solution] The invention provides a device 11, a bag manufacturing facility 10, and a bag manufacturing method for detecting abnormalities in the sealed heat-sealed portion while transporting a bag-shaped material whose opening has been sealed by a heating sealing device 12. The device is located downstream of the heating sealing device 12 and includes a radiation temperature measuring means 13 capable of detecting the surface temperature of the heat-sealed portion of the bag-shaped material, and an abnormality detection means 14 which sets a threshold using the surface temperature of the heat-sealed portion of a bag-shaped material A with a normal heat-sealed portion obtained by transporting it in advance, and the passage time of the bag-shaped material A as it passes in front of the radiation temperature measuring means 13. This threshold is then compared with the surface temperature of the heat-sealed portion of the bag-shaped material B to be inspected and transported afterward, and the passage time of the bag-shaped material B as it passes in front of the radiation temperature measuring means 13 to detect abnormalities in the heat-sealed portion of the bag-shaped material B.

Description

Technical Field

[0001] The present invention relates to an abnormal detection device for a heat-sealed portion of a bag-shaped material whose opening is blocked by heating, a bag manufacturing facility, and a bag manufacturing method.

Background Art

[0002] Conventionally, for example, fertilizers and the like, which are granular substances, are sold to consumers in a state of being enclosed in a bag made of polyethylene or the like. This bag is shipped to a fertilizer sales company, for example, with only the bottom of a bag-shaped material having openings at both its upper and lower parts blocked and its upper part open. At this sales company, after continuously filling fertilizers and the like from the upper opening and then closing the upper part, it is shipped as a product.

[0003] Here, the bottom of the bag-shaped material is blocked by heating the opening with a heat-sealing device (see, for example, Patent Document 1). However, when an abnormality occurs in the blocked heat-sealed portion, such as tearing, peeling, twisting during heat-sealing, or foreign matter mixing, there is a risk that fertilizers and the like will leak from the bottom of the bag-shaped material when the fertilizer sales company fills the fertilizers and the like. Also, when dirt adheres to the heat-sealed portion, there is a risk of a problem with the appearance. Therefore, conventionally, after an operator visually confirmed the presence or absence of abnormalities, it was shipped to a sales company.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the confirmation of abnormalities by an operator was poor in workability, and there was a limit to the number of sheets that could be processed. Furthermore, depending on the occurrence situation of abnormalities, there was also a risk that an operator could not confirm them visually.

[0006] The object of the present invention is to provide an apparatus, a bag manufacturing apparatus, and a bag manufacturing method that can efficiently detect abnormalities in the heat-sealed portion of a bag-shaped material with good workability. [Means for solving the problem]

[0007] The inventors of the present invention conducted various studies on an abnormality detection device to eliminate the need for manual confirmation of abnormalities in the heat-sealed portion of a bag-shaped material. As a result, they found that the above problem can be solved by setting a threshold using the surface temperature of the heat-sealed portion of a bag-shaped material with a normal heat-sealed portion obtained from a pre-transported bag-shaped material, and the passage time of the bag-shaped material as it passes in front of the radiation temperature measuring means, and then using this threshold to detect abnormalities in the heat-sealed portion of the bag-shaped material to be inspected afterward, thereby completing the present invention.

[0008] The gist of this invention is as follows: [1] A device for detecting abnormalities in a sealed heat-welded portion while transporting a bag-shaped material whose opening has been sealed by a heating and sealing device, A radiation temperature measuring means is provided, which is located downstream of the heating and sealing device and capable of detecting the surface temperature of the heat-sealed portion of the bag-shaped material during transport. An abnormality detection means is provided that detects an abnormality in the heat-welded portion of the bag-shaped material A, which is to be inspected and transported afterward, by using the surface temperature of the heat-welded portion of the bag-shaped material A, which has been transported in advance, and the passage time of the bag-shaped material A as it passes in front of the radiation temperature measuring means, and comparing this threshold with the surface temperature of the heat-welded portion of the bag-shaped material B, which is to be transported afterward, and the passage time of the bag-shaped material B as it passes in front of the radiation temperature measuring means. An abnormality detection device for the heat-sealed portion of a bag-shaped material, characterized by being equipped with the following features.

[0009] [2] The device for detecting abnormalities in the heat-welded portion of a bag-shaped material according to [1] above, characterized in that the threshold is the time it takes for the bag-shaped material A to pass in front of the radiation temperature measuring means, and the average value of the surface temperature of the heat-welded portion of the bag-shaped material A during that time.

[0010] [3] The heating blockage device is capable of handling multiple types of bag-shaped materials that differ in one or more of the thickness, color, and material, and is capable of detecting abnormalities in the heat-sealed portions of the multiple types of bag-shaped materials, as described in [1] or [2] above.

[0011] [4] A bag manufacturing apparatus characterized by comprising an abnormality detection device for the heat-sealed portion of the bag-shaped material described in any of [1] to [3] above, and the heating occlusion device.

[0012] [5] A method for manufacturing bags using the bag manufacturing equipment described in [4] above, A threshold setting step is performed by conveying the bag-shaped material A, closing the opening of the bag-shaped material A with the heating closure device, detecting the surface temperature of the heat-sealed portion of the bag-shaped material A with the radiation temperature measuring means, and measuring the passage time of the bag-shaped material A as it passes in front of the radiation temperature measuring means, thereby setting the threshold; After the transport of the bag-shaped material A is completed, the bag-shaped material B is transported while the opening of the bag-shaped material B is sealed by the heating sealing device, the surface temperature of the heat-sealed portion of the bag-shaped material B is detected by the radiation temperature measuring means, the passage time of the bag-shaped material B as it passes in front of the radiation temperature measuring means is measured and compared with the threshold to detect an abnormality, and an abnormality detection step is performed. A method for manufacturing a bag, characterized by having [a certain characteristic]. [Effects of the Invention]

[0013] According to the present invention, the device for detecting abnormalities in the heat-sealed portion of a bag-shaped material, the bag manufacturing equipment, and the bag manufacturing method make it possible to efficiently detect abnormalities in the heat-sealed portion of a bag-shaped material with good workability. [Brief explanation of the drawing]

[0014] [Figure 1] This is an explanatory diagram of a bag manufacturing facility relating to one embodiment of the present invention. [Figure 2] This graph shows time-series data of the surface temperature of the heat-sealed portion of the bag-shaped material obtained by an abnormality detection device for the heat-sealed portion of the bag-shaped material in the bag manufacturing equipment. [Figure 3] (a) to (f) are photographs showing abnormalities detected in the heat-welded area, and graphs showing time-series data of the surface temperature of the heat-welded area when the abnormality occurred. [Modes for carrying out the invention]

[0015] The present invention provides an abnormality detection device for the heat-sealed portion of a bag-shaped material, which is used to detect abnormalities in the sealed heat-sealed portion while transporting a bag-shaped material whose opening has been sealed by a heating and sealing device. A radiation temperature measuring means is positioned downstream of the heating and sealing device and is capable of detecting the surface temperature of the heat-sealed portion of the bag-shaped material during transport. An abnormality detection means is used to detect abnormalities in the heat-welded portion of bag-shaped material A, which has been transported in advance and whose heat-welded portion is normal, by setting a threshold using the surface temperature of the heat-welded portion of bag-shaped material A and the passage time of bag-shaped material A as it passes in front of the radiation temperature measuring means. This threshold is then compared with the surface temperature of the heat-welded portion of bag-shaped material B, which is to be transported afterward, and the passage time of bag-shaped material B as it passes in front of the radiation temperature measuring means. It is characterized by being equipped with these features.

[0016] By using the abnormality detection device for the heat-sealed portion of bag-shaped materials of the present invention, the threshold value used to determine abnormalities in the heat-sealed portion can be set simply and easily. In particular, the threshold value is set from a bag-shaped material of the same type as the bag-shaped material to be inspected, obtained from a previously transported bag-shaped material with a normal heat-sealed portion, before the bag-shaped material to be inspected is transported (manufactured). This eliminates the need for the operator to readjust the threshold value each time, for example, when changing the type of bag-shaped material to be manufactured or when the manufacturing environment (temperature, etc.) of the bag-shaped material fluctuates. Therefore, abnormalities in the heat-sealed portion of bag-shaped materials can be detected efficiently and with good workability.

[0017] The bag body manufacturing equipment of the present invention is characterized by including an abnormality detection device for the heat welding part of a bag-shaped material and a heat sealing device.

[0018] By using the bag body manufacturing equipment of the present invention, while conveying the bag-shaped material A, the opening of the bag-shaped material A is closed by the heat sealing device, and the surface temperature of the heat welding part of the bag-shaped material A is detected by the radiation temperature measuring means. At the same time, the passing time of the bag-shaped material A passing in front of the radiation temperature measuring means is measured, and a threshold value is set (that is, the threshold value setting step). After the conveyance of the bag-shaped material A is completed, while continuously conveying the bag-shaped material B, the opening of the bag-shaped material B is closed by the heat sealing device, and the surface temperature of the heat welding part of the bag-shaped material B is detected by the radiation temperature measuring means. At the same time, the passing time of the bag-shaped material B passing in front of the radiation temperature measuring means is measured and compared with the threshold value to detect an abnormality (that is, the abnormality detection step). Therefore, it is possible to efficiently detect an abnormality in the heat welding part of the bag-shaped material with good workability.

[0019] Hereinafter, each device configuration of the bag body manufacturing equipment of the present invention will be described. (Heat sealing device) The heat sealing device is a device for closing the opening of a bag-shaped material. It sandwiches the opening of the bag-shaped material from both sides in the thickness direction of the bag-shaped material, heats and melts it, and adheres it with pressure (that is, heat seals it). It is a device provided with a pair of heating parts. Here, the heat sealing device is a device capable of closing the opening of at least one type of bag-shaped material, but it is preferably a device capable of corresponding to closing the openings of a plurality of types of bag-shaped materials that differ in any one or two or more of thickness, color, and material.

[0020] The heating part is linear or roll-shaped. In use, it heats etc. while intermittently conveying the bag-shaped material or while continuously conveying the bag-shaped material to close (seal) the opening. Here, the number of processed sheets for closing the opening of the bag-shaped material is not particularly limited, but for example, about 20 to 80 sheets per minute is preferable, about 20 to 60 sheets is more preferable, and about 30 to 50 sheets is even more preferable. The heating and sealing device has a control unit that can control, for example, the heating temperature of the bag-shaped material (opening), the heating time, the transport speed, etc.

[0021] (Bag-like material) The bag-like material is formed by overlapping two film-like sheets and has an opening in a part of it. For example, a cylindrical bag-like material has openings at both the top and bottom. When used, the bottom opening is sealed by the heating and sealing device, then granular or powdered materials such as fertilizer, food, or ingredients are loaded into it, and the top opening is sealed. This top opening can be sealed by heating or other means using a heating and sealing device with a similar configuration to the heating and sealing device described above, or it may be sealed by a method other than heating using another device.

[0022] The material of the bag-shaped material is not particularly limited as long as it is a material that can be sealed at the opening by the above-mentioned heat sealing device. Examples include thermoplastic resins such as polyethylene, polypropylene, and polyvinyl chloride (PVC), and nylon. However, since nylon is difficult to heat seal, it is preferable to use a double film made by laminating nylon with linear polyethylene (thermoplastic resin), for example.

[0023] (radiant temperature measurement means) The radiation temperature measuring means is positioned downstream of the heating and sealing device and is capable of detecting the surface temperature of the heat-sealed portion of the bag-shaped material during transport. Here, "downstream" means the downstream side in the transport direction of the bag-shaped material, and it is preferable that the position be such that the surface temperature can be detected when the heat-sealed portion sealed by the heating and sealing device still has a sufficiently high temperature. Depending on the transport speed of the bag-shaped material, specifically, the position is such that the surface temperature can be detected immediately after the bag-shaped material is discharged from the heating and sealing device. For example, it is preferable that the position be within 5m, more preferably within 3m, even more preferably within 1m, and particularly preferably within 0.5m, in the downstream direction of transport of the bag-shaped material from the heating and sealing device (the position where heat sealing is performed).

[0024] As a means of measuring radiation temperature, for example, a radiation thermometer can detect infrared radiation emitted from the heat-welded area and measure the surface temperature of the heat-welded area non-contact, which is different from thermography, which can acquire an image that represents the heat distribution as a diagram. With thermography, it is necessary to recognize the entire heat-welded area at once, so sufficient space must be secured for installation, and the equipment costs are also high. On the other hand, with a radiation thermometer, the temperature is measured at a point, and the temperature change can be obtained as the bag-shaped material is transported, so the installation space can be made more compact and equipment costs can be reduced.

[0025] (Anomaly detection means) The abnormality detection means is a control means that detects abnormalities in the heat-sealed portion of the bag-shaped material B being inspected, and can, for example, use a computer. The above-mentioned radiation temperature measuring means is connected to this anomaly detection means, and the surface temperature of the heat-welded portion of the bag-shaped material detected by the radiation temperature measuring means is received in real time by the anomaly detection means. Furthermore, the abnormality detection means is also connected to the control unit of the heating blockage device. If the abnormality detection means determines that the heat-sealed portion is abnormal, it transmits this abnormality signal to the control unit, allowing the bag-shaped material that has been determined to be abnormal to be discharged to a different location from the bag-shaped material that has been determined to be normal.

[0026] The abnormality detection means can set a threshold using the surface temperature of the heat-welded portion of a bag-shaped material A with a normal heat-welded portion, which has been transported in advance, and the passage time of the bag-shaped material A as it passes in front of the radiation temperature measuring means. Here, the surface temperature of the heat-sealed portion of the bag-shaped material A depends on the type of bag-shaped material A, but is preferably in the range of 50 to 150°C, more preferably in the range of 50 to 100°C, and even more preferably in the range of 60 to 90°C. The transit time can be obtained from the duration from the position where the surface temperature of the bag-shaped material A is detected (the position where the temperature rises sharply) to the position where the surface temperature of the bag-shaped material A is no longer detected (the position where the temperature drops sharply) (the same applies to bag-shaped material B).

[0027] To set the threshold, one bag-shaped material A with a normal heat-sealed area can be used, but it is preferable to use multiple pieces of two-piece material, specifically about 3 to 10 pieces, and more preferably about 3 to 7 pieces. When using multiple pieces, the average value can be used. The threshold can be set by assigning a predetermined tolerance value to the measurement data. This tolerance value can be set, for example, by using past performance data or a specific percentage. The specific percentage is preferably ±10% of the measurement data, more preferably ±7%, and even more preferably ±5%. The value obtained by assigning this percentage to the measurement data becomes the threshold. It is preferable, for example, for the operator to change and readjust this percentage while confirming the accuracy of anomaly detection.

[0028] The above threshold value is compared with the surface temperature of the heat-sealed portion of the bag-shaped material B, which is to be transported for inspection, and the passage time of the bag-shaped material B as it passes in front of the radiation temperature measuring means to detect abnormalities in the heat-sealed portion of the bag-shaped material B. This comparison determines that the surface temperature and transit time of the heat-sealed portion of the bag-shaped material B are normal if they fall within the above threshold range, and abnormal if they exceed the upper limit or fall below the lower limit of the above threshold. After this determination is made, the abnormal bag-shaped material B is separated from the normal bag-shaped material B, and only the normal bag-shaped material B is used as the product, while the abnormal bag-shaped material B is disposed of, for example, by waste disposal.

[0029] The following describes specific embodiments of the bag manufacturing equipment of the present invention with reference to the drawings, but the present invention is not limited to these embodiments.

[0030] As shown in Figure 1, a bag manufacturing apparatus 10 according to one embodiment of the present invention will be described. The bag manufacturing equipment 10 includes an abnormality detection device (hereinafter also simply referred to as the abnormality detection device) 11 for the heat-sealed portion of the bag-shaped material, and a heating and sealing device 12. The abnormality detection device 11 is equipped with a radiation thermometer 13 (radiation temperature measuring means) and an abnormality detection means 14. The radiation thermometer 13 detects the surface temperature of the heat-sealed portion of the bag-shaped material (bag-shaped material A and bag-shaped material B) during transport, specifically by detecting infrared radiation from the heat-sealed portion and measuring the surface temperature of the heat-sealed portion of the bag-shaped material non-contact. The abnormality detection means 14 detects abnormalities in the heat-sealed portion of bag-shaped material B, which is the object to be inspected and will be transported afterward, based on a threshold value set using bag-shaped material A, which has been transported in advance and has a normal heat-sealed portion. Reference numeral 15 in Figure 1 indicates a guide roller that guides the transport of the bag-shaped material.

[0031] Next, a method for manufacturing bags using a bag manufacturing equipment 10 according to one embodiment of the present invention will be described. The bag manufacturing method includes a threshold setting step and an abnormality detection step.

[0032] (Threshold setting process) First, while the bag-shaped material A is being transported, the opening of the bag-shaped material A is sealed by the heating and sealing device 12, and the surface temperature of the heat-sealed portion of the bag-shaped material A is detected by the radiation thermometer 13. This operation is repeated five times (or multiple times). In other words, measurement data is obtained from five bag-shaped materials A with normal heat-sealed portions. Furthermore, after the measurement data is obtained, the worker visually inspects the heat-sealed portion of the bag-shaped material A to determine whether it is functioning correctly. This inspection only needs to be performed on five bag-shaped materials A, which is more efficient than inspecting the heat-sealed portion of all manufactured bag-shaped materials.

[0033] Next, we set the threshold. Here, the average passage time of five bag-shaped materials A passing in front of the radiation thermometer 13 is calculated, and a threshold passage time is calculated by adding and subtracting values ​​based on past performance to this calculated value. Furthermore, for each of the five bag-shaped materials A, the average surface temperature of the heat-sealed part of the bag-shaped material A during the passage time is calculated, and using these calculated average values ​​for the five bag-shaped materials A, an even greater average is calculated, and a threshold surface temperature is calculated by adding and subtracting values ​​based on past performance to this calculated value.

[0034] (Anomaly detection process) After the transport of the bag-shaped material A is completed, the bag-shaped material B is transported while the opening of the bag-shaped material B to be inspected is sealed with the heating and sealing device 12, and the surface temperature of the heat-sealed part of the bag-shaped material B is detected with the radiation thermometer 13. Then, the above threshold is compared with the surface temperature of the heat-sealed portion of the bag-shaped material B that has been transported thereafter, and the passage time of the bag-shaped material B as it passes in front of the radiation thermometer 13, in order to detect an abnormality in the heat-sealed portion of the bag-shaped material B. That is, if the surface temperature of the heat-sealed portion of the bag-shaped material B is within the range of the above threshold, and the passage time of the bag-shaped material B is within the range of the above threshold, the heat-sealed portion is judged to be normal, and if either or both are outside the range of the above threshold, the heat-sealed portion is judged to be abnormal.

[0035] Figure 2 shows the time-series data of the surface temperature of the heat-sealed portion of the bag-shaped material. As shown in Figure 2, the bag-shaped material is conveyed intermittently. Accordingly, the time-series data of the surface temperature of the heat-sealed portion of the bag-shaped material rises in areas where the surface temperature of the bag-shaped material is detected and decreases in areas where the surface temperature is not detected, resulting in a regularly repeating uneven shape. Furthermore, regarding the bag-shaped material in the center of Figure 2, a sharp increase in surface temperature occurred towards the end of the measurement, indicating that some kind of abnormality occurred in the heat-welded area. Below, we will explain the results in Figures 3(a) to 3(f) based on this time-series data.

[0036] Figure 3(a) shows the results when foreign matter is mixed into the heat-welded area. As shown in Figure 3(a), the time-series data of the surface temperature of the heat-sealed portion of the bag-shaped material B, which was the subject of inspection, shows a regularly repeating uneven shape, but a sharp temperature increase was observed near the center of the time-series data (at one location). This is thought to be because foreign matter mixed into the opening was heated during the heat-sealing process, and the temperature did not decrease easily in the region where this heated foreign matter was present.

[0037] Figure 3(b) shows the result when printing ink adheres to the surface of the heat-welded area. As shown in Figure 3(b), the time-series data of the surface temperature of the heat-sealed portion of the bag-shaped material B, which was the subject of inspection, shows a regularly repeating pattern of unevenness. However, a rapid temperature increase was observed from around the middle to the end of the time-series data (at three locations). This is thought to be because the printing ink adhering to the surface of the heat-sealed portion was heated, and the temperature did not decrease easily in the areas where this heated printing ink was present.

[0038] Figure 3(c) shows the result when twisting (catching) occurred during heat welding at the heat-welded area. As shown in Figure 3(c), the time-series data of the surface temperature of the heat-welded portion of the bag-shaped material B, which was the subject of inspection, shows a regularly repeating uneven shape, but a rapid temperature increase was observed near the center of the time-series data (at one location). This is thought to be because the twisted portion of the heat-welded portion was heated, and the temperature did not decrease easily in the region where this heated twisted portion was present.

[0039] Figure 3(d) shows another result when twisting (catching) occurs during heat welding at the heat-welded area. As shown in Figure 3(d), the time-series data of the surface temperature of the heat-welded portion of the bag-shaped material B, which was the subject of inspection, shows a regularly repeating uneven shape. However, a rapid temperature increase was observed near the center of the time-series data (at one location), similar to that in Figure 3(c). This is thought to be because the twisted portion of the heat-welded portion was heated, and the temperature did not decrease easily in the region where this heated twisted portion existed.

[0040] Figure 3(e) shows the result when dirt due to workpiece blockage adheres to the surface of the heat-welded area. As shown in Figure 3(e), the time-series data of the surface temperature of the heat-welded portion of the bag-shaped material B being inspected showed no repetition of regular uneven shapes, and instead, irregular uneven shapes were observed. This is thought to be due to workpiece jamming, which increased the time the bag-shaped material B passed in front of the radiation thermometer.

[0041] Figure 3(f) shows the result when chipping occurs in the heat-welded area. As shown in Figure 3(f), the time-series data of the surface temperature of the heat-welded portion of the bag-shaped material B being inspected shows a regularly repeating uneven shape, but a sharp rise in temperature was observed near the center of the time-series data (at one location). This is thought to be due to the marking of the chipped portion being heated, and the temperature rising in the region where this heated marking portion is located.

[0042] The above temperature rise areas (Figures 3(a) to (d), (f)) can be identified as abnormal in the heat-welded area if they exceed a preset surface temperature threshold when compared with this threshold. Similarly, the area where the passage time of the bag-shaped material B in front of the radiation thermometer is prolonged (Figure 3(e)) can be identified as abnormal in the heat-welded area if it exceeds a preset passage time threshold when compared with this threshold. Here, depending on the type of time-series data of the surface temperature of the heat-welded portion of the bag-shaped material B that was judged to be abnormal, it is also possible to infer the mode of occurrence of the abnormality (see Figures 3(a) to (f)). Furthermore, by recording time-series data of the surface temperature of the heat-sealed portion of the bag-shaped material B (for example, by storing it in the anomaly detection means 14), it can be used, for example, as data for quality assurance.

[0043] As described above, the present invention provides an abnormality detection device for the heat-sealed portion of a bag-shaped material, a bag manufacturing facility, and a bag manufacturing method. In detecting abnormalities in the heat-sealed portion of a bag-shaped material B to be inspected, the threshold is set before the bag-shaped material B is transported, based on a bag-shaped material A of the same type as bag-shaped material B, which has a normal heat-sealed portion obtained after transport. Therefore, the threshold can be set easily and simply, and even when the type of bag-shaped material to be manufactured is changed or the manufacturing environment (temperature, etc.) of the bag-shaped material changes, the operator does not need to readjust the threshold each time, allowing for efficient and well-functioning detection of abnormalities in the heat-sealed portion of the bag-shaped material.

[0044] Although the present invention has been described above with reference to embodiments, the present invention is not limited in any way to the configurations described in the embodiments described above, and includes other embodiments and modifications that can be considered within the scope of the matters described in the claims. For example, the scope of the present invention also includes cases in which some or all of the above embodiments and modifications are combined to constitute an abnormality detection device for the heat-sealed portion of a bag-shaped material, a bag manufacturing equipment, and a bag manufacturing method of the present invention. [Industrial applicability]

[0045] This invention is industrially useful because it allows for efficient and easy detection of abnormalities in the heat-sealed portions of bag-shaped materials. [Explanation of Symbols]

[0046] 10: Bag manufacturing equipment, 11: Anomaly detection device for heat-sealed parts of bag-shaped material, 12: Heat sealing device, 13: Radiation thermometer (radiation temperature measuring means), 14: Anomaly detection means, 15: Guide roller

Claims

1. A device for detecting abnormalities in a sealed heat-welded portion while transporting a bag-shaped material whose opening has been sealed by a heating and sealing device, A radiation temperature measuring means is provided, which is located downstream of the heating and sealing device and capable of detecting the surface temperature of the heat-sealed portion of the bag-shaped material during transport. An abnormality detection means is provided that detects an abnormality in the heat-welded portion of the bag-shaped material A, which is to be inspected and transported afterward, by comparing the surface temperature of the heat-welded portion of the bag-shaped material A, which has been transported in advance and whose heat-welded portion is normal, with the passage time of the bag-shaped material A as it passes in front of the radiation temperature measuring means, and then comparing this threshold with the surface temperature of the heat-welded portion of the bag-shaped material B, which is to be transported afterward, and the passage time of the bag-shaped material B as it passes in front of the radiation temperature measuring means. An abnormality detection device for the heat-sealed portion of a bag-shaped material, characterized by being equipped with the following features.

2. The device for detecting abnormalities in the heat-welded portion of a bag-shaped material according to claim 1, characterized in that the threshold value is the passage time of the bag-shaped material A as it passes in front of the radiation temperature measuring means, and the average value of the surface temperature of the heat-welded portion of the bag-shaped material A during the passage time.

3. The heating and sealing device is capable of handling multiple types of bag-shaped materials that differ in one or more of the thickness, color, and material, and is capable of detecting abnormalities in the heat-sealed portions of the multiple types of bag-shaped materials, as described in claim 1.

4. A bag manufacturing apparatus characterized by comprising an abnormality detection device for the heat-sealed portion of a bag-shaped material according to any one of claims 1 to 3, and the heating and sealing device.

5. A method for manufacturing bags using the bag manufacturing equipment described in claim 4, A threshold setting step is performed by conveying the bag-shaped material A, closing the opening of the bag-shaped material A with the heating and sealing device, detecting the surface temperature of the heat-sealed portion of the bag-shaped material A with the radiation temperature measuring means, and measuring the passage time of the bag-shaped material A as it passes in front of the radiation temperature measuring means, thereby setting the threshold; After the transport of the bag-shaped material A is completed, the bag-shaped material B is transported while the opening of the bag-shaped material B is sealed by the heating and sealing device, the surface temperature of the heat-sealed portion of the bag-shaped material B is detected by the radiation temperature measuring means, the passage time of the bag-shaped material B as it passes in front of the radiation temperature measuring means is measured and compared with the threshold value to detect an abnormality, and an abnormality detection step is performed. A method for manufacturing a bag, characterized by having [a certain characteristic].

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