JP2010151522A - Packaging container inspection method, and packaging container inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packing container inspection device capable of enhancing inspection precision relating to the supply state of a hotmelt adhesive more than before. <P>SOLUTION: The packing container inspection device 20 is adopted to a forming apparatus 10 that forms a packing box 7 in such a manner that a sheet 3 is folded so as to superpose a part of the sheet 3 while conveying the sheet 3 by means of a sheet conveyor 4 and an overlapped portion P1 is bonded with a hotmelt adhesive. The packing container inspection device compares a temperature at an outer face of the overlapped portion P1 in an outer face of the packing box 7 with a determination temperature so as to inspect whether or not the hotmelt adhesive is adequately supplied to the overlapped portion P1. In the packing container inspection device, a temperature at an outer face of a non-overlapped portion P2 that is other than the overlapped portion P1 in the outer face of the packing box 7 is detected by means of a third temperature sensor 23, and thereby the determination temperature is corrected on the basis of the detected temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an inspection method and an inspection apparatus for inspecting a packaging container that is formed by bending a sheet so that a part of the sheet overlaps and bonding a portion where the sheet is overlapped with a hot melt adhesive.

  A packaging box for packaging cans and the like is assembled by applying a hot melt adhesive to the inner flap and then bonding the top surface or the outer flap to the inner flap. In products assembled using hot melt adhesives in this way, if there is an abnormality in the hot melt adhesive supply state during assembly, such as when the amount of applied hot melt adhesive is small, the adhesive strength will be insufficient, May decompose. As is well known, since the hot melt adhesive is supplied in a heated and melted state, if the hot melt adhesive is normally supplied, the temperature of the outer surface of the part bonded with the hot melt adhesive is reduced. Higher than other parts. Therefore, the temperature of the outer surface of the part bonded with the hot melt adhesive is detected, and the hot melt adhesive is normally supplied to the part bonded with the hot melt adhesive by comparing the detected temperature with a predetermined judgment temperature. There is known an inspection method for inspecting whether or not it is performed.

  The packaging box is assembled by folding a sheet as a packaging material, and the temperature of the sheet changes with the air temperature. That is, as the temperature increases, the seat temperature also increases, and as the temperature decreases, the seat temperature also decreases. For this reason, if the determination temperature for determining the supply state of the hot melt adhesive is constant, the temperature change of the sheet cannot be handled, and the supply state of the hot melt may be erroneously determined. For example, when the determination temperature is set to be low, the temperature of the sheet itself increases due to an increase in the air temperature, and the temperature of the outer surface of the molded packaging container may be equal to or higher than the determination temperature over the entire surface. In this case, it may be determined that the hot melt adhesive is normally supplied even if the hot melt adhesive is in a small amount or is not supplied. On the other hand, if the determination temperature is set high, the temperature of the outer surface of the portion where the hot melt adhesive is normally supplied may be lower than the determination temperature when the temperature is low. In this case, even if the hot melt adhesive is normally supplied, it is determined that there is an abnormality in the supply state of the hot melt adhesive in that portion.

  Then, an object of this invention is to provide the packaging container test | inspection method and packaging container test | inspection apparatus which can raise the test | inspection precision regarding the supply state of a hot-melt-adhesive agent conventionally.

  The packaging container inspection method of the present invention is formed by folding a sheet (3) as a packaging material so that a part thereof overlaps, and adhering an overlapping part (P1) on which the sheets are overlapped with a hot melt adhesive. Applied to the packaging container (7), the hot melt adhesive is normally supplied to the overlapping portion by comparing the temperature of the outer surface of the overlapping portion of the outer surface of the packaging container with a predetermined judgment temperature. In the packaging container inspection method for inspecting whether or not there is a problem, the determination temperature is corrected based on the temperature of the outer surface of the outer surface of the packaging container other than the overlapping portion (P2), thereby solving the above-described problem. To do.

  According to the packaging container inspection method of the present invention, since the determination temperature is corrected based on the temperature of the outer surface of the portion other than the overlapping portion of the outer surface of the packaging container, the change in the temperature of the sheet due to the change in the air temperature is detected. It can be reflected in the judgment temperature. Therefore, it is possible to improve the accuracy of inspection as to whether or not the hot melt adhesive is normally supplied to the overlapping portion. Further, by correcting the determination temperature based on the temperature of the outer surface of the portion other than the overlapping portion as described above, the inspection accuracy can be improved as compared with the case where the determination temperature is corrected based on the air temperature. In general, the temperature is detected by placing a temperature sensor in the room where the molding device for molding the packaging container is placed.If this temperature sensor is placed near the doorway or the cooling / heating device, it opens and closes the door or opens from the cooling / heating device. There is a possibility that the detected value may change suddenly by direct contact with cold air or hot air. On the other hand, since the seat has a heat capacity, the temperature of the seat itself does not change for a while even when the door is opened and closed or the air temperature changes due to the air conditioner. Therefore, if the determination temperature is corrected based on the air temperature, the determination temperature may be erroneously corrected. Therefore, by correcting the determination temperature based on the temperature of the outer surface of the portion other than the overlapping portion as in the inspection method of the present invention, the inspection accuracy can be improved as compared with correcting the determination temperature based on the air temperature.

  In one form of the packaging container inspection method of the present invention, when a predetermined correction condition is satisfied, an intermediate temperature between the temperature of the outer surface of the overlapping portion and the temperature of the outer surface of the portion other than the overlapping portion is calculated, The calculated temperature may be set as the determination temperature. In this case, a temperature equal to or higher than the temperature of the outer surface of the portion other than the overlapping portion can be set as the determination temperature. Therefore, even if the temperature of the sheet changes due to a change in temperature, the change in the temperature of the sheet can be appropriately reflected in the determination temperature.

  The packaging container inspection apparatus of the present invention is configured to bend a sheet (3) as a packaging material on a conveyor (4) so that a part of the sheet overlaps, and hot the overlapping part (P1) where the sheets are stacked. Applied to the molding apparatus (10) for molding the packaging container (7) by bonding with a melt adhesive, and compares the temperature of the outer surface of the overlapping portion of the outer surface of the molded packaging container with a predetermined judgment temperature In the packaging container inspection device (20) for inspecting whether or not the hot melt adhesive is normally supplied to the overlapping portion, the overlapping portion of the outer surface of the packaging container being conveyed by the conveyor A temperature detection means (23) for detecting the temperature of the outer surface of the portion (P2) other than the above, a correction means (24) for correcting the determination temperature based on the temperature detected by the temperature detection means, By comprises, for solving the above problems.

  According to the packaging container inspection device of the present invention, the change in the temperature of the sheet due to the change in the air temperature can be reflected in the determination temperature, as in the packaging container inspection method of the present invention described above. Moreover, since determination temperature is correct | amended based on the temperature of the outer surface of parts other than an overlap part among the outer surfaces of a packaging container, test | inspection precision can be improved rather than correcting determination temperature with air temperature. Therefore, it is possible to improve the accuracy of inspection as to whether or not the hot melt adhesive is normally supplied to the overlapping portion.

  In one form of the packaging container inspection apparatus of the present invention, the temperature detecting means includes both the outer surface of the overlapping portion and the outer surface of the portion other than the overlapping portion of the outer surface of the packaging container being conveyed by the conveyor. The correction means is provided so as to detect the temperature of the inspection range (A3) passing through, and the correction means is configured to detect the temperature when the outer surface of the overlapping portion passes the inspection position when a predetermined correction condition is satisfied. A temperature intermediate between the temperature detected by the detection means and the temperature detected by the temperature detection means when the outer surface of the portion other than the overlapping portion passes the inspection position, and the calculated temperature is the determination The temperature may be set. In this case, since the temperature equal to or higher than the temperature of the outer surface of the portion other than the overlapping portion can be set as the determination temperature, the change in the sheet temperature can be appropriately reflected in the determination temperature. In addition, since both the temperature of the outer surface of the overlapping portion and the temperature of the outer surface of the portion other than the overlapping portion can be detected by one temperature detection means, the device can be downsized and the cost of the device can be reduced.

  In one form of the packaging container inspection apparatus of this invention, it arrange | positions below the passage range (A2) through which the predetermined part (Ag) of the sheet | seat in the middle of the conveyance currently conveyed by the said conveyor passes, A non-contact temperature sensor (22) provided with a detection unit (22a) for detecting temperature facing diagonally upward, and a portion of the detection unit facing the passage range at a predetermined cycle Air injection means (25) for injecting air may be further provided. In this case, it is possible to suppress the accumulation of dust in the portion facing the passage range of the detection unit, so that the detection accuracy of the non-contact temperature sensor can be increased.

  In addition, in the above description, in order to make an understanding of this invention easy, the reference sign of the accompanying drawing was attached in parenthesis, but this invention is not limited to the form of illustration by it.

  As described above, according to the present invention, the determination temperature is corrected by the temperature of the outer surface of the portion other than the overlapping portion of the outer surface of the packaging container. It can be reflected in the judgment temperature. Therefore, the inspection accuracy regarding the supply state of the hot melt adhesive can be improved as compared with the conventional case.

  FIG.1 and FIG.2 has shown schematic structure of the caser in which the packaging container inspection apparatus which concerns on one form of this invention was integrated. 1 shows a plan view of the caser, and FIG. 2 shows a perspective view of the caser. In this caser 1, sheets 3 as flat packaging materials are taken out one by one from the sheet magazine 2 (see FIG. 2). The sheet 3 is made of a packaging material such as cardboard or paperboard. Each sheet 3 is bent into a predetermined semi-finished product state (a state in the middle of assembly) and periodically placed on the sheet conveyor 4. The sheet 3 is taken out from the sheet magazine 2 by, for example, an adsorption type apparatus that conveys the sheet 3 using a suction force. The sheets 3 placed on the sheet conveyor 4 are conveyed linearly at a constant speed in a line at a predetermined pitch by the sheet conveyor 4. A can conveyor 5 is provided on the side of the sheet conveyor 4. The can conveyor 5 conveys beverage cans (finished products filled with contents) 6 as packaging objects, and is driven to run in the same direction as the sheet conveyor 4 at the same speed.

  A predetermined number of beverage cans 6 conveyed by the can conveyor 5 are placed on the sheet 3 by pushers (not shown) that reciprocate between the can conveyor 5 and the sheet conveyor 4 in a direction perpendicular to the conveying direction. It is pushed in at once. Thereafter, the sheet 3 is bent into a completed state by the forming apparatus 10 (see FIG. 1). At this time, as shown in FIG. 2, the sheet 3 is first bent so that the top surface portion 3 a covers the beverage can 6 and is inserted between the top surface portion 3 a and the beverage can 6. The flap 3b is bent. Subsequently, a hot melt adhesive is supplied from a hot melt gun (not shown) to the first inner flap 3b, and a part of the top surface portion 3a is attached to the outside of the first inner flap 3b. Next, the second inner flap 3c is bent so that the remaining opening is closed. Thereafter, the hot melt adhesive is supplied from the hot melt gun 11 to the second inner flap 3c, and the outer flap 3d is stuck on the outside of the second inner flap 3c. Thus, each part of the sheet | seat 3 is bend | folded and affixed, and the packaging box (henceforth a carton) 7 as a packaging container which accommodated the predetermined number of drink cans 6 is manufactured.

  FIG. 3 shows an enlarged portion of the molding apparatus 10 where a hot melt gun 11 for applying a hot melt adhesive to the second inner flap 3c is provided. The hot melt gun 11 supplies the hot melt adhesive to four adhesive supply ranges Ag set on the sheet 3 in the middle of molding as shown in FIG. As shown in this figure, the adhesive supply range Ag is one place at the top and bottom of the second inner flap 3c on the front side in the transport direction, and one place at the top and bottom of the second inner flap 3c on the back side in the transport direction. Each is set. And from the hot melt gun 11, when the sheet | seat 3 in the middle of shaping | molding passes the application position Pa shown in FIG. 4, a hot melt adhesive is apply | coated to the upper part and the lower part of one 2nd inner flap 3c, respectively.

  As shown in FIG. 1, the molding apparatus 10 is provided with a packaging container inspection apparatus 20. The packaging container inspection device 20 includes first and second temperature sensors 21 and 22 for detecting the temperature of the outer surface of the second inner flap 3c of the sheet 3 being molded, and the top of the carton 7 molded by the molding device 10. A plurality of (five in FIG. 1) third temperature sensors 23 for detecting the temperature of the outer surface of the surface portion 3a, and a determination device 24 to which the first to third temperature sensors 21, 22, 23 are connected. ing. As each temperature sensor 21, 22, 23, for example, an infrared temperature sensor that measures the intensity of infrared rays radiated from an inspection object and thereby measures the temperature of the inspection object is provided.

  As shown in FIG. 4, the first temperature sensor 21 passes through the adhesive supply range Ag set in the lower part of the second inner flap 3 c of the sheet 3 being formed being conveyed by the sheet conveyor 4. It is provided so that the temperature of the inspection range A1 can be detected. As shown in FIGS. 3 and 4, the first temperature sensor 21 is disposed on the side of the sheet conveyor 4 and at a position higher than the first inspection range A1. Therefore, the first temperature sensor 21 is provided so that the detection unit 21a for detecting the temperature of the first inspection range A1 faces obliquely downward. The second temperature sensor 22 detects the temperature of the second inspection range A2 through which the adhesive supply range Ag set in the upper part of the second inner flap 3c of the sheet 3 being formed being conveyed by the sheet conveyor 4 passes. It is provided as possible. As shown in FIGS. 3 and 4, the second temperature sensor 22 is disposed on the side of the sheet conveyor 4 and at a position lower than the second inspection range A2. For this reason, the second temperature sensor 22 is provided such that the detection unit 22a for detecting the temperature of the second inspection range A2 faces obliquely upward.

  As described above, when the detection unit 22a faces obliquely upward, dust such as paper dust from the sheet 3 is likely to accumulate thereon. Therefore, the packaging container inspection apparatus 20 is provided with an air nozzle 25 for removing dust such as paper dust accumulated on the detection unit 22a. The air nozzle 25 is provided such that air is ejected toward a portion of the detection portion 22a facing the second inspection range A2 of the ejection port 25a. Although not shown, an electromagnetic valve is provided at the other end of the air nozzle 25 so that air is periodically supplied to the air nozzle 25. The air nozzle 25 may be connected to an exhaust port of a solenoid valve for operating the hot melt gun 11. In this case, air can be sprayed to the detection unit 22a every time hot melt adhesive is sprayed from the hot melt gun 11. Therefore, the second temperature sensor 22 corresponds to the non-contact temperature sensor of the present invention. The second inspection range A2 corresponds to the passage range of the present invention, and the adhesive supply range Ag corresponds to the predetermined portion of the present invention. The air nozzle 25 corresponds to an air injection unit.

  FIG. 5 is an enlarged perspective view showing a portion where the third temperature sensor 23 is provided in the molding apparatus 10. As shown in FIG. 5, the five third temperature sensors 23 are arranged above the sheet conveyor 4 in a direction orthogonal to the conveying direction of the sheet conveyor 4. The five third temperature sensors 23 are provided facing downward so that the temperature of the third inspection range A3 through which the top surface portion 3a of the carton 7 conveyed by the sheet conveyor 4 passes can be detected. ing. As described above, a part of the top surface portion 3a is bonded to the first inner flap 3b with a hot melt adhesive. Therefore, as shown in FIG. 6, the top surface portion 3a includes an overlapping portion P1 bonded to the first inner flap 3b with a hot-melt adhesive and a non-overlapping portion P2 other than that. In FIG. 6, a portion to which the hot melt adhesive is supplied is indicated by a range G. Thus, since the overlapping portion P1 is overlapped with the first inner flap 3b and bonded with the hot melt adhesive, this portion corresponds to the overlapping portion of the present invention. Further, since the non-overlapping portion P2 is not overlapped with other portions, this portion corresponds to a portion other than the overlapping portion of the present invention. And the 3rd temperature sensor 23 provided so that detection of the temperature of 3rd test | inspection range A3 which these overlapping part P1 and non-overlapping part P2 pass corresponds to the temperature detection means of this invention.

  Signals corresponding to the detected temperatures are output from the first to third temperature sensors 21, 22, and 23, respectively. These output signals are input to the determination device 24. The discriminating device 24 may be realized by a computer unit including a microprocessor and peripheral devices such as RAM and ROM necessary for its operation, or may be realized by a hardware control circuit. The determination device 24 determines whether or not the hot melt adhesive is normally supplied to each part of the sheet 3 based on the output signals from the temperature sensors 21, 22, and 23.

  For example, when the temperature detected by the first temperature sensor 21 when the second inner flap 3c of the sheet 3 being molded passes through the first inspection range A1 is equal to or higher than a predetermined threshold, the determination device 24 performs the second operation. It is determined that the hot melt adhesive is normally supplied to the adhesive supply range Ag below the inner flap 3c. Similarly, when the temperature detected by the second temperature sensor 22 when the second inner flap 3c of the sheet 3 being molded passes through the second inspection range A2 is equal to or higher than a predetermined threshold, It is determined that the hot melt adhesive is normally supplied to the adhesive supply range Ag on the upper side of the inner flap 3c.

  Further, the discriminating device 24 has a predetermined temperature detected by each third temperature sensor 23 when the overlapping portion P1 of the top surface portion 3a of the carton 7 molded by the molding device 10 passes the third inspection range A3. It is determined whether or not the temperature is equal to or higher than the determination temperature. If each detected temperature is equal to or higher than the determination temperature, it is determined that the hot melt adhesive is normally supplied to the overlapping portion P1. In addition, about this overlap part P1, the temperature which each 3rd temperature sensor 23 detected may be compared with determination temperature, respectively, and the supply state of a hot-melt-adhesive may be discriminate | determined. An average value of the detected temperatures may be obtained, and the average value may be compared with a determination temperature to determine the supply state of the hot melt adhesive. If the determination device 24 determines that any of the bonded portions of the carton 7 is abnormal in each of these inspections, the determination device 24 may notify the abnormality of the caser 1 using a monitor, a warning light, or the like. At this time, the operation of the caser 1 may be stopped. Thereby, it can prevent that the carton 7 which has abnormality in the supply state of a hot-melt-adhesive is shape | molded.

  The temperature of the sheet 3 formed in the carton 7 by the caser 1 changes according to the air temperature, more specifically, the temperature of the room in which the caser 1 is disposed (hereinafter sometimes abbreviated as room temperature). That is, the temperature of the sheet 3 increases as the room temperature increases, and the temperature of the sheet 3 decreases as the room temperature decreases. The change in the temperature of the sheet 3 affects the inspection performed by the determination device 24, and particularly affects the inspection of the overlapping portion P1. As described above, whether or not the hot melt adhesive is normally supplied to the overlapping portion P1 is determined based on the temperature of the outer surface of the overlapping portion P1. Therefore, the influence of the temperature of the sheet 3 on the inspection accuracy becomes larger than in the case where the temperature of the hot melt adhesive is directly detected and inspected. Therefore, the determination device 24 repeatedly executes the determination temperature correction routine shown in FIG. 7 at a predetermined cycle in order to correct the determination temperature. By executing this routine, the determination device 24 functions as the correction means of the present invention.

  In the determination temperature correction routine of FIG. 7, the determination device 24 first determines whether or not a predetermined correction condition is satisfied in step S11. This correction condition is determined to be satisfied when, for example, a timer that outputs a signal every predetermined time (for example, 3 minutes) is provided in the determination device 24 and a signal is output from this timer. Alternatively, a switch may be provided in the determination device 24, and it may be determined that the correction condition is satisfied when the switch is operated by an operator. If it is determined that the correction condition is not satisfied, the current routine is terminated.

  On the other hand, if it is determined that the correction condition is satisfied, the process proceeds to step S12, and the determination device 24 acquires the temperature of the overlapping portion P1 and the temperature of the non-overlapping portion P2 of the carton 7 that has passed the third inspection range A3. These temperatures are the detected value of the third temperature sensor 23 when the overlapping portion P1 of the carton 7 passes the third inspection range A3, and the non-overlapping portion P2 of the carton 7 passes the third inspection range A3. What is necessary is just to acquire the detection value of the 3rd temperature sensor 23 when doing. Further, the temperature detected by the third temperature sensor 23 is highest when the overlapping portion P1 of the top surface portion 3a of the carton 7 passes, and the third temperature sensor 23 when the non-overlapping portion P2 passes. Detects the lowest temperature. Therefore, the maximum temperature and the minimum temperature when the top surface portion 3a of the carton 7 passes through the third inspection range A3 may be acquired. In subsequent step S13, the determination device 24 calculates an intermediate temperature between the two acquired temperatures (hereinafter, sometimes referred to as an intermediate temperature). In the next step S14, the determination device 24 sets the calculated intermediate temperature as the determination temperature. Thereafter, the current routine is terminated.

  FIG. 8 shows the temperature T1 of the overlapping portion P1 and the temperature T2 of the non-overlapping portion P2 when the room temperature is 20 ° C., and the temperature T1 ′ of the overlapping portion P1 and the temperature of the non-overlapping portion P2 when the room temperature is 26 ° C. An example of T2 ′ is shown. In FIG. 8, the corrected determination temperature at each room temperature is indicated by a broken line. As shown in FIG. 8, when the room temperature is 26 ° C., the temperature T2 ′ of the non-overlapping portion P2 is higher than the determination temperature when the room temperature is 20 ° C. Therefore, when the room temperature is 26 ° C. and the determination temperature when the room temperature is 20 ° C. is used as it is, it is determined that the hot melt adhesive is also present in the non-overlapping portion P2. On the other hand, in the packaging container inspection apparatus 20 of the present invention, when the room temperature rises and the temperature of the sheet 3 rises, the judgment temperature rises, so that the judgment temperature can be prevented from becoming lower than the temperature of the sheet 3. Further, since the determination temperature decreases when the room temperature decreases and the temperature of the sheet 3 decreases, the determination temperature can be prevented from becoming higher than the temperature of the sheet 3. Since the determination temperature is corrected by the temperature of the non-overlapping portion P2, the determination temperature can be set higher than the temperature of the non-overlapping portion P2, as indicated by a broken line in FIG.

  As described above, according to the packaging container inspection apparatus 20 of the present invention, since the change in the temperature of the sheet 3 can be reflected on the determination temperature, the supply state of the hot melt adhesive in the overlapping portion P1 is erroneous. Discrimination can be suppressed. Further, by correcting the determination temperature based on the temperature of the outer surface of the non-overlapping portion P2, it is possible to prevent the determination temperature from being erroneously corrected as compared with the case where the determination temperature is corrected based on the room temperature or the air temperature. Therefore, it is possible to improve the accuracy of the inspection as to whether or not the hot melt adhesive is normally supplied to the overlapping portion P1.

  Moreover, in this packaging container test | inspection apparatus 20, since the temperature of the outer surface of the overlapping part P1 and the temperature of the outer surface of the non-overlapping part P2 can be detected with the same 3rd temperature sensor 23, it is for detecting the temperature of the non-overlapping part P2. There is no need to provide a separate temperature sensor. Therefore, the apparatus can be downsized and the cost of the apparatus can be reduced.

  Furthermore, since the air nozzle 25 is provided, it is possible to prevent dust such as paper dust from accumulating on the inspection portion 22a of the second temperature sensor 22. Therefore, the temperature detection accuracy of the second temperature sensor 22 can be increased.

  The present invention may be implemented in various forms without being limited to the form described above. For example, the temperature sensor is not limited to an infrared temperature sensor. Various temperature sensors that can detect the temperature of the inspection object without contacting the inspection object may be used.

  The portion for detecting the temperature used for correcting the determination temperature is not limited to the non-overlapping portion of the top surface portion. For example, the determination temperature may be corrected by the temperature of the outer surface of various portions of the carton that are not attached with the hot melt adhesive. For example, the determination temperature may be corrected based on the temperature of the surface facing the front side in the transport direction or the surface facing the rear side in the transport direction of the carton.

The figure which shows schematic structure of the caser in which the packaging container inspection apparatus which concerns on one form of invention was integrated. The perspective view of the caser of FIG. The figure which expands and shows a part of shaping | molding apparatus. The figure which shows the part to which a hot-melt-adhesive agent is supplied with a hot-melt gun. The perspective view which expands and shows the part in which the 3rd temperature sensor is provided in the shaping | molding apparatus. The figure which shows the packaging box shape | molded with the shaping | molding apparatus. The flowchart which shows the determination temperature correction routine which a discrimination | determination apparatus performs. The figure which shows an example of the temperature of the overlap part when the room temperature is 20 degreeC, the temperature of the non-overlap part, and the temperature of the overlap part when the room temperature is 26 degreeC.

Explanation of symbols

3 sheet 4 sheet conveyor 7 packaging box (packaging container)
10 Molding device 20 Packaging container inspection device 22 Second temperature sensor (non-contact temperature sensor)
22a detector 23 third temperature sensor (temperature detection means)
24 Discriminating device (correction means)
25 Air nozzle (Air injection means)
P1 overlapping part P2 non-overlapping part (parts other than overlapping part)
A2 Second inspection range (passage range)
A3 Third inspection range Ag Adhesive supply range (predetermined part)

Claims (5)

It is applied to a packaging container formed by bending a sheet as a packaging material so that a part thereof overlaps, and an overlapping portion where the sheets are stacked is bonded with a hot melt adhesive, and the above-described outer surface of the packaging container In the packaging container inspection method for inspecting whether or not the hot melt adhesive is normally supplied to the overlapping portion by comparing the temperature of the outer surface of the overlapping portion with a predetermined determination temperature,
The method for inspecting a packaging container, wherein the determination temperature is corrected based on a temperature of an outer surface of the outer surface of the packaging container other than the overlapping portion.   When a predetermined correction condition is satisfied, an intermediate temperature between the temperature of the outer surface of the overlapping portion and the temperature of the outer surface of the portion other than the overlapping portion is calculated, and the calculated temperature is set as the determination temperature. The packaging container inspection method according to claim 1. It is applied to a molding device that forms a packaging container by folding a sheet as a packaging material on a conveyor, folding the sheet so that a part of it overlaps, and adhering the overlapping part where the sheets are overlapped with a hot melt adhesive A packaging for inspecting whether or not the hot melt adhesive is normally supplied to the overlapping portion by comparing a predetermined judgment temperature with the temperature of the outer surface of the overlapping portion of the outer surface of the molded packaging container In container inspection equipment,
Temperature detecting means for detecting the temperature of the outer surface of the packaging container being conveyed by the conveyor other than the overlapping portion, and correcting the determination temperature based on the temperature detected by the temperature detecting means. And a correction means. The temperature detection means is provided so as to detect the temperature of the inspection range through which both the outer surface of the overlapping portion and the outer surface of the portion other than the overlapping portion of the outer surfaces of the packaging containers conveyed by the conveyor pass. And
The correction means, when a predetermined correction condition is satisfied, the temperature detected by the temperature detection means when the outer surface of the overlapping portion passes the inspection position and the outer surface of the portion other than the overlapping portion 4. The packaging container according to claim 3, wherein a temperature intermediate between the temperature detected by the temperature detection means when passing through the inspection position is calculated, and the calculated temperature is set as the determination temperature. Inspection device.   The detection part for detecting the temperature of the predetermined part is provided so as to face obliquely upward, arranged below the passing range through which the predetermined part of the sheet being formed being conveyed by the conveyor passes. 5. The apparatus according to claim 3, further comprising: a non-contact temperature sensor; and an air injection unit that injects air at a predetermined period to a portion of the detection unit that faces the passage range. The packaging container inspection device described.

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