JP6130167B2 - Seal inspection device - Google Patents

Description

  The present invention relates to a seal inspection apparatus using an adhesive or the like.

  Conventionally, a film is attached to the outer periphery of the container. As for the method of attachment, the sides of the film are joined with an adhesive or the like to form a cylindrical shape, which is then covered with a container. When the covered film is heated and shrunk, the film is attached to the outer periphery of the container. A portion joined with an adhesive or the like is used as a seal, and the seal has a strip shape.

  If the seal is poor, the film may be peeled off. Therefore, it is necessary to inspect the seal of the film. For example, Patent Document 1 below discloses an apparatus for inspecting a film seal. In Patent Document 1 below, a seal is irradiated with light and reflected light is used to inspect the width of the seal.

  However, the reflected light differs depending on the printing of the color, pattern, character, picture or the like on the film, and the setting may be complicated or inspection may not be possible. If the width of the seal is narrow, it is defective, but there are other defects such as the adhesive being dispersed, and it is unclear whether the device of Patent Document 1 can cope with various defects.

JP 2011-033459 A

  An object of the present invention is to provide an apparatus capable of inspecting various film seals without being influenced by the color of the film.

  The present invention is a seal inspection apparatus in which a film is joined, a means for blowing gas from an air nozzle to the seal, a sensor for detecting gas vibration caused by blowing gas to the seal, and the detected gas vibration. And determining means for determining whether there is a seal failure.

  Gas is blown from the air nozzle to the seal, and the seal film is vibrated. The gas vibrates and the vibration is detected by the sensor. A seal failure is determined from the detected gas vibration.

  There are a plurality of sensors, and these sensors are arranged. The sensor includes a condenser microphone.

  There are a plurality of air nozzles, and the angle, height, distance, or at least one of the gases blown onto the seal is different for each air nozzle.

  The sensor further includes a guide for transmitting gas vibrations to the sensor.

  The film may be sent by a film transfer means, and the gas spraying means and the sensor may be respectively arranged at a plurality of positions in a route through which the film is sent. The distance measuring means measures the distance between the positions where the gas spraying means and the sensor are arranged to measure that the film has been sent, and when the determining means determines that the film is defective at all positions, the seal is defective. Is determined.

  The sensor is placed at multiple positions, one sensor is placed at a position where it can detect gas vibration due to gas blowing on the seal, and the other sensor detects gas vibration caused by blowing gas onto the seal. You may arrange | position in the position which cannot. When the one sensor detects gas vibration due to gas blowing to the seal and the other sensor does not detect gas vibration due to gas blowing to the seal, the determination means determines that the seal is defective. .

  Since the present invention detects vibration generated by blowing gas on the seal, it can detect a seal failure regardless of the printing of the film. By using a plurality of sensors, vibrations caused by external factors other than the seal can be eliminated. By using a plurality of air nozzles and blowing gas onto the seal from various directions, vibrations can be generated due to various defects and films. By further providing a guide for transmitting the vibration of the gas, the vibration of the gas is easily transmitted, and the sensor can detect a minute change in the vibration.

It is a figure which shows the structure of the seal | sticker test | inspection apparatus of this invention, (a) is a figure which shows the structure seen from the upper surface, (b) is a figure which shows the structure seen from the front. It is a figure which shows a normal seal | sticker, (a) is sectional drawing, (b) is a top view. It is a figure which shows the defective part of a seal | sticker, (a) is sectional drawing, (b) is a top view, (c) is a figure which shows the flow of gas. It is a figure which shows the defective part where the width | variety of a seal | sticker is insufficient, (a) is sectional drawing, (b) is a top view, (c) is a figure which shows the flow of gas. It is a figure which shows the defective part which the joining of the seal | sticker became point joining, (a) is sectional drawing, (b) is a top view, (c) is a figure which shows the flow of gas. (A) is the figure which the film became convex upwards by the gas of 1 direction, (b) is a figure which vibrates a film with the gas of 2 directions. It is the figure which has arrange | positioned the means and the sensor which spray a gas to each of the several position of the path | route which sends a film. It is the figure which has arrange | positioned the sensor in the path | route which sends a film, and a position other than that. It is the figure which has arrange | positioned the means and the sensor which spray gas to each of several position of the path | route which sends a film, and has arrange | positioned the sensor in the position of other than that.

  The seal inspection apparatus of the present invention will be described with reference to the drawings. The present invention inspects the quality of a seal obtained by bonding a film with an adhesive or the like.

  The film seal inspection apparatus 10 shown in FIG. 1 includes a gas blowing means 14 having an air nozzle 12, a sensor 16 for detecting gas vibration, a guide 17, and a determination means 18 for determining the presence or absence of a seal failure. The guide 17 is a cross-sectional view taken along the line BB in FIG. 1B in FIG. 1A, and the cross-sectional view taken along the line AA in FIG. 1A in FIG. It has become.

  An example of the film 20 shown in FIG. 2 is a long film. While the film 20 wound on the roll is fed out, the side portions of the film 20 are overlapped with each other and bonded with the adhesive 22 or a solvent. The side portions of the two films 20 may be joined, or the both sides of the one film 20 may be folded so as to be overlapped, and the overlapped portions may be joined. A portion joined with the adhesive 22 or the like is referred to as a seal 24. Since the seal 24 is formed along the side portion of the film 20, the seal 24 has a band shape.

  The inspection apparatus 10 of the present invention is an apparatus that inspects after forming the seal 24 while the film 20 is being transferred. The seal 24 is also formed to extend in the transfer direction. The guide roller prevents the film 20 from flapping so that the film 20 passes through a certain position.

  The material of the film 20 includes PET (polyethylene terephthalate) resin, PE (polyethylene) resin, PS (polystyrene) resin, PP (polypropylene) resin, PVC (polyvinyl chloride) resin, and the like. Can be mentioned. The film 20 may be a heat shrink film or the like.

  Examples of the adhesive 22 include polyether urethane polyol and polyisocyanate. Examples of the solvent include ethyl acetate, tetrahydrofuran, n-hexane, methyl ethyl ketone, dioxolane or acetone. After the adhesive 22 or solvent is applied to the film 20, it may be sandwiched between nip rolls and joined.

  The gas blowing means 14 has a compressor 26 and an air nozzle 12. The compressor 26 delivers gas at a predetermined pressure. The gas having a predetermined pressure by the compressor 26 passes through the tube 28 and is blown out from the air nozzle 12. The air nozzle 12 determines the direction, angle, and position of blowing gas to the seal 24.

  The diameter of the air nozzle 12 is about 0.2 to 0.5 mm, the distance to the seal 24 is about 3 to 20 mm, and the pressure of the compressor 26 is about 0.1 to 0.5 MPa. When the gas A blows out from the air nozzle 12, the vibration detected by the sensor 16 is less likely to be generated, and the defective film 20 is vibrated.

  As shown in FIG. 2, the film 20 has a planar shape, and the film 20 is overlaid with a seal 24. If the seal 24 is normal, the films 20 are bonded together with an adhesive 22 or a solvent. If the seal 24 is defective, the films 20 are not joined to each other, and a gap 30 is generated (FIG. 3A). A normal part of the seal 24 is indicated by reference numeral 24a, and a defective part is indicated by reference numeral 24b. Reference numeral 24 comprehensively indicates reference numerals 24a and 24b.

  The direction of the gas A is a direction in which the gas A enters the defective portion 24b when the film 20 of the seal 24 is not joined. Further, in order to put the gas A into the defective portion 24b, the gas A is blown obliquely upward or substantially parallel to the seal 24.

  (1) When the seal 24 is normal, the gas A flows from the lower film 20 to the upper film 20. Only the gas A passes above the seal 24, and the vibration of the gas A is very small. (2) When the seal 24 is defective and the end portions of the film 20 are not joined to each other, the gas A enters the defective portion 24b (FIG. 3). The upper film 20 is turned up and deformed by the gas A. At that time, the film 20 of the seal 24 vibrates, and the gas vibrates due to the influence. In addition to the upper film 20 vibrating, the upper film 20 may flutter and hit the lower film 20 to cause both the films 20 to vibrate. Or the direction of the gas A changes with the defective part 24b (FIG. 3). In some cases, the vibration of the gas A reaches the microphone 16.

  As in (1) and (2) above, the vibration of the gas when the gas A is blown between the normal portion 24a and the defective portion 24b of the seal 24 is different. By using the difference in vibration of the seal 24, the quality of the seal 24 can be determined. Although the vibration of the gas caused by the vibration of the object includes a sound wave, the vibration of the gas in the present invention is not limited to the vibration in the audible range.

  Two air nozzles 12 are used, and gas A is blown onto the seal 24 from two directions. When viewed from above the film 20, for example, one air nozzle 12 blows the gas A from an angle of 90 ° with respect to the direction in which the seal 24 extends. The other air nozzle 12 blows the gas A from an angle other than 90 ° (for example, 50 °) with respect to the direction in which the seal 24 extends. A compressor 26 may be provided for each air nozzle 12, or the gas A may be blown off by branching from one compressor 26 to two air nozzles 12.

  By blowing the gas A from two directions, the gas is surely entered into the defective portion 24b. Alternatively, the direction of the gas A is changed by the defective portion 24b. For example, even in the case of a defective portion 24b having a narrow width of the adhesive 22 as shown in FIG. 4, a part of the film 20 is turned over by one gas A, and the film 20 is vibrated by the other gas A. Alternatively, the direction of the gas A is changed. When the adhesive 22 or the like as shown in FIG. 5 is dispersed or bubbles are generated to cause point joining, a part of the upper film 20 is turned over and vibrates, or both the films 20 hit and vibrate. Alternatively, the direction of the gas A is changed.

  Further, the number of the air nozzles 12 is two, and the height with respect to the seal 24 may be changed for each air nozzle 12 or the distance may be shifted in addition to changing the angle. By making the angle, height, distance, or at least one of them different for each air nozzle 12, the defective portion 24b is reliably vibrated.

  In FIG. 3 and subsequent figures, the flow of the gas A is shown as one, but in the two gas flows, as shown in FIG. 3C, at least one gas A penetrates the defective portion 24b. It is in the direction. The direction in which the gas A penetrates through the defective portion 24b is easy to deform and vibrate the film 20. As shown in FIG. 4C and FIG. 5C, even if the gas A does not penetrate the defective portion 24b, the direction of the gas A is set to penetrate the defective portion 24b.

  Further, if the rigidity of the film 20 is very small, the gas 20 in one direction may only push up the film 20 (FIG. 6A). At this time, the vibration of the film 20 is small and may not be detected by the sensor 16. By blowing the gas A from two directions, one gas A regulates the movement of the film 20, and the other gas A penetrates the defective portion 24b (FIG. 6B). The film 20 can be vibrated. FIG. 6B shows only the gas A that penetrates the defective portion 24b.

  The sensor 16 detects the vibration of the gas transmitted through the space by the vibration of the film 20 or the change in the direction of the gas A. For example, a capacitor microphone can be used as the sensor 16. In the capacitor microphone, the distance between the two electrodes changes due to vibration, and the capacitance between the electrodes changes. As a result, the signal (output voltage) output from the capacitor microphone changes. You may amplify a signal with an amplifier as needed. Since the vibration of the film 20 or the vibration of the gas caused by the change in the direction of the gas A is detected, the inspection can be performed regardless of the printing of the film 20.

  The inspection apparatus 10 in FIG. 1 has two sensors 16 arranged side by side. For example, they are arranged at an interval of about 20 mm in the direction in which the film 20 is transferred. This is to cancel vibrations (noise) other than the vibration of the film 20 or the vibration due to the change in the direction of the gas A.

  A guide 17 is provided so that the gas A does not diffuse to places other than the seal 24. The guide 17 is appropriately provided in front of, on the side of, and above the air nozzle 12. When the guide 17 confines the gas A inside, the sensor 16 can easily detect the vibration of the gas. In order to confirm the position and status of the seal 24, the guide 17 may be formed of a transparent plate.

  The guide 17 that transmits the vibration of the gas efficiently transmits the change in the vibration of the gas due to the change in the direction of the gas A to the sensor 16. When the gas A is blown out from the air nozzle 12, the gas vibration is reflected on the surface of the guide 17 when there is a defective portion, so that more gas vibration is transmitted to the sensor 16 than when there is no guide 17. .

  By providing the guide 17, the change in the direction of the gas A is reliably transmitted to the sensor 16. For example, even if the rigidity of the film 20 as shown in FIG. 6A is very small and the gas A just passes through the seal 24 while changing its direction, the vibration of the gas due to the change in the direction of the gas A Is efficiently transmitted to the sensor 16.

  The guide 17 that transmits the vibration of the gas is not limited to the configuration that covers the sensor 16. If the change in the gas vibration due to the change in the direction of the gas A is efficiently transmitted to the sensor 16, only one plate may be installed above the seal 24.

  Factors that cause gas vibration include the seal 24 and other external factors (such as noise from outside). The seal 24 is a portion where the gas A is blown and vibration is generated, and so on. The distance to the sensor 16 is much closer to the seal 24 than external factors. Therefore, when the two sensors 16 are viewed from an external factor, they are almost in the same position. When a vibration from an external factor is detected, there is no difference in the signal output from the sensor 16. On the other hand, when the two sensors 16 are viewed from the seal 24, the distances to the sensors 16 are different. When vibration from the seal 24 is detected, a difference occurs in the signal output from the sensor 16.

  The air outlet 12 and the gas pressure of the air nozzle 12 are optimized so that the vibration when the seal 24 is normal is not increased more than necessary, and the difference in gas vibration between the normal portion 24a and the defective portion 24b can be increased. In addition, the sensor 16 is arranged in the position where the difference in the gas from the seal 24 appears.

  The determination unit 18 is a unit that receives the output of the sensor 16 and determines whether or not the seal 24 is defective. Further, the determination unit 18 includes a filter unit that takes the difference between the outputs of the two sensors 16 before performing the determination and removes vibrations generated from external factors other than the seal 24. If the difference becomes zero, the vibration is caused by an external factor, and if the difference does not become zero, the vibration of the seal 24 occurs. In the case of vibration of the seal 24, the presence or absence of a defect is determined. For example, it is determined that the sensor 16 is defective when the output of the sensor 16 is out of a predetermined range.

  Further, the determination means 18 includes not only the presence / absence of a defect, but also means for determining the position of the defect. The film 20 is delivered at a predetermined moving speed, and the position of the seal 24 on the film 20 is determined to be defective based on the speed of the film 20 and the time when the film 20 is determined to be defective. Alternatively, based on a length measurement signal from the seal processing apparatus main body, it is determined which position of the seal portion 24 of the film 20 is defective. The determination unit 18 can be configured by hardware such as a computer, software, or both. The defective position may be displayed on a computer monitor or the like.

  As described above, the gas A is blown onto the seal 24, and the film 20 of the defective portion 24b is turned up and deformed. Since the present invention uses the vibration generated by the deformation, the quality of the seal 24 can be determined regardless of the printing of the film 20.

  The number of sensors 16 is not limited as long as vibration when gas A is sprayed on film 20 can be detected. The directivity of the sensor 16 may be increased so that the vibration of the gas from the seal 24 can be easily detected. In addition, a normal microphone may be used as the sensor 16 if audible vibration occurs when the gas A is blown onto the defective portion 24b.

  The number of the air nozzles 12 is not limited as long as the gas A can be blown into the defective portion 24 b of the seal 24 to vibrate the film 20. There may be one air nozzle 12 or a plurality of air nozzles 12. In the case of a plurality of air nozzles 12, the film 20 may be easily caused to vibrate by changing the angle, height, distance, or at least one of the gas A blown from each air nozzle 12. Further, the pressure of the gas A blown from each air nozzle 12 may be varied.

  When the number of the air nozzles 12 is one, in addition to blowing the gas A at an angle of 90 ° with respect to the seal 24, the gas A may be blown from another angle. The manner of vibration differs depending on the film 20, and the angle at which the gas A is blown is adjusted according to the film 20.

  The gas A blown to the film 20 is not always limited to blowing at a constant pressure. The gas A may be blown out intermittently, or the gas A may be blown out while changing the pressure of the compressor 26 over time.

  The type of the gas A blown onto the film 20 is usually air, but may be changed depending on the type of the film 20. For example, if the film 20 is formed of a material that easily undergoes chemical changes such as oxidation, an inert gas is used as the gas A. The inert gas is nitrogen gas, argon gas, carbon dioxide gas, or a mixed gas thereof.

  Although the example in which the side part of a long film is joined was shown, the case where the side part of one film 20 is joined to the arbitrary part of the other film 20 may be sufficient. Moreover, the case where the one film 20 is joined to other members, such as a board, may be sufficient.

  In addition to performing the inspection while the film 20 is moving, the air nozzle 12 and the sensor 16 may be inspected while moving.

  When the film 20 is a long film 20, the inspection is performed in the middle of sending the film 20 by the transfer means, such as rewinding the film 20 from one roller to another roller. In this case, the gas A may be sprayed onto the seal 24 at a plurality of positions on the path (production path) through which the film 20 is sent, and the vibration of the gas A may be detected by the sensor 16.

  The seal inspection apparatus 40 of FIG. 7 arranges the gas blowing means 14 and the sensor 16 at a plurality of positions P1 and P2 in the middle of the film 20 being fed. The gas spraying means 14 and the sensors 16 at each position P1, P2 are plural as in the above embodiment. The vibration of the gas A detected by the sensor 16 at each position P1, P2 is input to the determination means 18. The determination means 18 determines the seal failure using the outputs of all the sensors 16. The interval between the positions P1 and P2 is adjusted so that the vibration due to the gas A ejected from the air nozzle 12 at one position does not affect the sensor 16 at the other position P2.

  The film 20 is fed, and the gas A is blown from the air nozzle 12 at a plurality of positions in the path of the film 20, and the vibration of the gas A caused by the defective seal 24 is detected by the sensor 16. In the inspection, as in the above embodiment, the determination means 18 takes the difference in the output of the sensor 16 at each position P1, P2, and determines a defect at each position P1, P2. Further, as shown in Table 1, when the determination unit 18 determines that all positions P1 and P2 are defective, the determination unit 18 finally determines the defect.

  The determination means 18 makes the determination of the defect at each of the positions P1 and P2 described above be the same position on the seal 24. Therefore, a distance measuring means 42 for measuring the moving distance of the film 20 is provided. For example, a roller is brought into contact with the film 20, and the moving distance of the film 20 is obtained from the number of pulses generated by the rotation of the roller. The number of pulses generated by the rotation of the roller is obtained with an encoder or the like. At that time, the amount of movement per pulse is determined in advance by the mechanical configuration. Whether or not there is a defect in the same part of the seal 24 at all positions P1 and P2 by the distance measuring means 42 measuring that a certain part of the film 20 has been sent from one position P1 to another position P2. Can be detected.

  The distance between P1 and P2 is known at the time of design, and is assumed to be L1, for example. It is assumed that the position where the seal 24 is present is determined to be defective at P1. After this determination, it is determined whether or not it is a failure at P2 when the distance determined by the distance measuring means 42 becomes L1. The inspected position of the seal 24 is the same for P1 and P2. If the seal 24 becomes defective at all positions P1, P2, it is determined as defective.

  Further, a time measuring means may be used as the distance measuring means 42. If the speed at which the film 20 is fed is constant, the time for moving from P1 to P2 is constant. For example, it is assumed that the time during which the film 20 is sent from P1 to P2 is t. If the time when a defect is detected at P1 is t1, if it is determined as defective at P2 when t1 + t, it is determined as defective.

  By detecting the vibration of the gas A at a plurality of positions P1 and P2, the accuracy of determination can be increased. For example, even if the vibration of the gas A is detected only at one place, if the vibration of the gas A is not detected at another position, some external factor is considered, and the detection accuracy is improved.

  In FIG. 7, the positions P1 and P2 at which the gas blowing means 14 and the sensor 16 are arranged are two, but they may be further increased. Even if the number of positions where the sensors 16 and the like are arranged increases, it is determined as defective when it is determined as defective at all positions, and if it is not determined as defective at any position, it is determined as defective at some positions. Is not judged as bad. As in the above embodiment, guides 17 for transmitting vibrations may be provided at the positions P1 and P2.

  Although the determination of the defect at each of the positions P1 and P2 and the determination of the comprehensive defect are performed by the single determination unit 18, each determination may be performed by a separate determination unit 18. The determination of the defect at each of the positions P1 and P2 is performed by providing the determination means 18 such as the first embodiment at each of the positions P1 and P2. A determination means 18 for performing comprehensive failure determination is separately provided, and the determination means 18 performs the determination.

  In the seal inspection apparatus 50 in FIG. 8, the sensor 16 is arranged at a position P3 in the path (production path) through which the film 20 is sent and at a position P4 other than that. In the path of the film 20, similarly to the first embodiment, a plurality of gas blowing means 14 and a plurality of sensors 16 are provided. Gas A is blown from the air nozzle 12 to the seal 24. At the position P3, the sensor 16 can detect the vibration of the gas A due to the blowing of the gas A onto the seal 24.

  Only the sensor 16 is arranged at the position P4. The same sensor 16 is used at each of the positions P3 and P4. At the position P4, the sensor 16 cannot detect the vibration of the gas A due to the blowing of the gas A onto the seal 24. The sensor 16 at the position P3 is one sensor, and the sensor 16 at the position P4 is another sensor.

  The determination means 18 determines the defect by taking the difference between the outputs of the one sensor 16 at the position P3, as in the above embodiment. However, when another sensor 16 at the position P4 detects the vibration of the gas A, an external factor is included in the determination of the failure at the position P3. Therefore, as shown in Table 2, the determination means 18 determines that the sensor 16 is defective when only one sensor 16 detects the vibration of the gas A. External factors can be eliminated and the accuracy of defect determination can be increased.

  Note that the number of sensors 16 arranged at the position P4 may be the same as the number of the positions P3. The configuration is such that the gas blowing means 14 is removed from the position P3. The determination means 18 takes the difference between the outputs of the other sensors 16 and detects vibration due to an external factor. As described above, when the difference becomes zero, the vibration is caused by an external factor. Even if the determination unit 18 determines that there is an external factor and determines a failure at the position P3, the determination unit 18 does not determine the failure.

  In FIG. 8, the gas blowing means 14 and the sensor 16 in the production path are arranged at one position P3, but they may be arranged at a plurality of positions. Further, the sensors 16 other than the production path may be arranged at a plurality of positions. You may provide the guide 17 which transmits a vibration in each position P3, P4.

  The seal inspection device 40 according to the sixth embodiment may be combined with the seal inspection device 50 according to the seventh embodiment. Like the seal inspection device 60 of FIG. 9, the gas A is blown from the air nozzle 12 to the seal 24 at a plurality of locations P <b> 1 and P <b> 2 in the path of the film 20. Furthermore, the sensor 16 is also arranged at a position P4 other than the film 20 conveyance path. As shown in Table 3, when a defect is determined at positions P1 and P2 on the path of the film 20, and the sensor 16 not on the path does not detect vibration, it is determined as defective.

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Each embodiment is not independent or exclusive, and each embodiment can be implemented in combination as appropriate.

10, 40, 50, 60: Seal inspection device 12: Air nozzle 14: Gas spraying means 16: Sensor 17: Guide 18: Determination means 20: Film 22: Adhesive 24: Seal 24a: Normal part 24b: Defect part 26: Compressor 28: tube 30: gap 42: distance measuring means

Claims (6)

An inspection device for a seal bonded with a film,
A gas blowing means for blowing gas from an air nozzle to the seal;
A sensor for detecting vibration of the gas due to the blowing of gas to the seal;
Determination means for determining the presence or absence of a seal failure from the detected gas vibration;
A transfer means for sending the film;
Ranging means for measuring the distance sent by the film;
With
The gas spraying means and the sensor are respectively arranged at a plurality of positions in a film sending path ,
The distance measuring means measures that the film has been sent at a distance between the positions where the gas blowing means and the sensor are arranged,
A seal inspection apparatus that determines that a seal is defective when the determination means determines that the seal is defective at all positions . An inspection device for a seal bonded with a film,
A gas blowing means for blowing gas from an air nozzle to the seal;
A sensor for detecting gas vibration;
Determination means for determining the presence or absence of a seal failure from the detected gas vibration;
A transfer means for sending the film;
Ranging means for measuring the distance sent by the film;
With
The gas spraying means and the sensor are respectively arranged at a plurality of positions in a film sending path,
At each of a plurality of positions in the path, the sensor is disposed at a plurality of positions, one sensor is disposed at a position where the vibration of the gas due to the blowing of gas onto the seal can be detected, and the other sensor is disposed on the seal. It is located at a position where it cannot detect the vibration of the gas due to the blowing of gas ,
When each of the plurality of positions in the path detects the vibration of the gas due to the blowing of gas to the seal and the other sensor does not detect the vibration of the gas due to blowing of the gas to the seal, The determination means determines that the seal is defective,
The distance measuring means measures that the film has been sent at a distance between the positions where the gas blowing means and the sensor are arranged,
A seal inspection apparatus that determines that a seal is defective when the determination means determines that the seal is defective at all positions on the path . The seal inspection apparatus according to claim 1 or 2 , wherein there are a plurality of sensors at each position. The seal inspection apparatus according to any one of claims 1 to 3 , wherein a plurality of the air nozzles are provided at each position, and an angle, a height, a distance, or at least one of the gas blown from each air nozzle with respect to the seal is different. One of the seal inspection apparatus 4 from claim 1, further comprising a guide for transmitting the vibration of the gas to the sensor at each position. Wherein the sensor either seal inspection apparatus claims 1-5 including a capacitor microphone.

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