JP2012145517A - Container leak detection method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of detecting a pinhole on a container bottom section with a high degree of accuracy and in a short period.SOLUTION: In a container leak detection method, a pedestal 40 is prepared. A pressure detection port 45 is open into the pedestal 40 with a circular seal section 41 surrounding the pressure detection port 45. By contacting a peripheral portion 103a of a bottom section 103 of a container 100 or a lower circumference of a middle section 101 with the seal section 41 of the pedestal 40, a sealed pressure detection space 70 is formed between the container bottom section 103 and the pedestal 40. Then, test pressure from a negative pressure source 10 is supplied to the pressure detection space 70 through the pressure detection port 45. Next, a pressure change in the pressure detection space 70 is detected through the pressure detection port 45 in a state of blocking a connection between the negative pressure source 10 and the pressure detection space 70. A leak on the container bottom section 103 is finally detected based on information on the pressure change.

Description

  The present invention relates to a method and apparatus for detecting leakage at the bottom of a container such as a plastic bottle.

  If the bottle has a defect such as a pinhole, the internal liquid may leak from the bottle minutely or impurities or bacteria may enter. Therefore, it is necessary to detect one by one whether there is a defect such as a pinhole, that is, whether there is a leak in the bottle.

  Patent Document 1 discloses a method for detecting leakage due to a pinhole or the like of a bottle with an air leak tester. Briefly, the air leak tester has a detection head. The detection head has a seal portion, and the bottle is sealed by pressing the seal portion against the neck opening edge of the bottle. In this state, compressed air is supplied to the inside of the bottle via the detection head, and then a pressure change in the bottle is detected by a pressure sensor connected to the detection head. Judge that there is a leak.

JP-A-4-265833

  By the way, when the resin bottle is molded by the biaxial stretch blow molding method, in the final stage, the center portion of the bottom of the molded bottle is sandwiched between the tip of the stretch rod and the bottom of the mold, and then Thus, the tip of the stretching rod is separated from the bottom of the bottle. In this process, defects such as pinholes may occur at the bottom of the bottle due to slight differences in conditions. In this molding method, as long as predetermined molding conditions are satisfied, pinholes and the like do not occur in parts other than the bottom.

As described above, when leak detection is performed using the detection method of Patent Document 1 on a bottle in which a portion where a pinhole is generated is limited to the bottom, there is the following inconvenience.
Since the space where the pressure change should be detected (pressure detection space) is the internal space of the bottle and has a large capacity, the ratio of the leak amount from the pinhole to the capacity of this pressure detection space is small, and the pressure detection space when a leak occurs The change in pressure will be small. As a result, pinholes cannot be detected unless the detection time is lengthened, and it is virtually impossible to detect minute pinholes (for example, a diameter of 100 microns or less).

The present invention has been made to solve the above problems, and a first aspect of the present invention is a method for detecting leakage at the bottom of a container.
Prepare a pedestal that has an opening for the pressure detection and is provided with an annular seal so as to surround the pressure detection opening.
By bringing the peripheral part of the bottom of the container or the lower outer periphery of the body part into contact with the seal part of the pedestal, a pressure detection space sealed between the container bottom and the pedestal is formed,
Next, the test pressure from the test pressure source is supplied to the pressure sensing space through the pressure sensing port,
Next, in a state where the test pressure source and the pressure detection space are blocked, a pressure change in the pressure detection space is detected through the pressure detection port, and leakage of the bottom of the container is detected based on the information on the pressure change. Is detected.

  According to the first aspect, the pressure detection space has a small volume, and the ratio of the amount of leakage from the pinhole at the bottom to the volume of the pressure detection space can be greatly increased, resulting in a reduction in detection time. In addition to being able to detect minute pinholes. In addition, since the test pressure is supplied to the small-capacity pressure detection space, the supply time can be shortened.

According to a second aspect of the present invention, there is provided a method for detecting a leak at the bottom of a container.
Prepare a pedestal that has an opening for the pressure detection and is provided with an annular seal so as to surround the pressure detection opening.
By bringing the peripheral part of the bottom of the container or the lower outer periphery of the body part into contact with the seal part of the pedestal, a pressure detection space sealed between the container bottom and the pedestal is formed,
Next, the test pressure from the test pressure source is supplied into the container from the neck opening of the container,
Next, a pressure change in the pressure detection space is detected through the pressure detection port, and leakage at the bottom of the container is detected based on information on the pressure change.

  According to the second aspect, since the pressure detection space has a small volume, the detection time can be shortened and even a minute pinhole can be detected.

Preferably, in the first and second aspects, a concave portion is formed at the bottom of the container, and an annular portion that is continuous on a plane perpendicular to the central axis of the container is formed at the peripheral edge of the bottom. The pressure sensing space is formed between the container bottom and the pedestal by bringing the annular portion of the container bottom into contact with the seal portion of the pedestal.
According to this, the volume of the pressure detection space can be minimized by applying the peripheral edge of the container bottom to the seal member of the pedestal.

When the annular part as described above is not formed at the peripheral part of the bottom of the container, and an annular part having a convex curve or a convex curve and a straight line is formed at the lower part of the body part of the container. The following means can be employed.
The pedestal has a bottom portion and a cylindrical portion, the sealing portion is provided on the inner periphery of the cylindrical portion, the pressure detection opening is opened at the bottom portion, and the lower portion of the body portion of the container is connected to the cylindrical portion of the pedestal. The pressure detection space is formed between the bottom of the container and the pedestal by inserting and bringing the annular part formed in the body part into contact with the seal part.

In the first aspect, preferably, the test pressure source is a negative pressure source.
According to this, the container can be attracted toward the base by the negative pressure in the pressure detection space, and the sealing performance of the pressure detection space can be improved.

Preferably, in the step of supplying the test pressure and the step of detecting the pressure change in the pressure detection space, the opening edge of the neck is pressed toward the pedestal.
According to this, the sealing performance of the pressure detection space can be improved.

When the peripheral part of the container bottom is brought into contact with the seal part, preferably, the pedestal has a convex part that enters the concave part of the container bottom part, and the pressure detection opening is opened on the top surface of the convex part.
According to this, the volume of the pressure detection space can be further reduced.

  According to the method of the present invention, leakage at the bottom of the container can be detected with high accuracy in a short time.

It is a figure which shows the leak detection method of the container bottom part concerning 1st Embodiment of this invention in a partial cross section. It is a figure which shows the leak detection method of the container bottom part concerning 2nd Embodiment of this invention in a partial cross section. It is sectional drawing which shows the modification of the base used in 1st, 2nd embodiment. It is sectional drawing which shows the other modification of the base used in 1st, 2nd embodiment. It is sectional drawing which shows the further another modification of the base used in 1st, 2nd embodiment. FIG. 6 is a transverse cross-sectional view of the lower portion of the body portion of the container in which leakage is detected using the pedestal of FIG. 5.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a plastic bottle 100 (container) and an air leak tester 1 for detecting leakage of the bottle 100.

  A bottle 100 to be inspected (work) is formed by, for example, a biaxial stretch blow molding method, and includes a barrel portion 101, a neck portion 102 that is connected to the upper portion of the barrel portion 101 and has a smaller diameter than the barrel portion 101, and a lower portion of the barrel portion 101. And a bottom portion 103 connected to the bottom. A concave portion 103 b is formed in the bottom portion 103, and a peripheral portion thereof protrudes on the opposite side of the neck portion 102. The peripheral edge portion has an annular portion 103 a that is continuous on a plane orthogonal to the axis of the body portion 101. The annular portion 103a is composed of a narrow surface or a rounded edge.

  The cross-sectional shape of the body portion 101 of the bottle 100 and the bottom annular portion 103a may be circular or non-circular. At the time of detection, the contents are not accommodated in the bottle 100, the neck 102 is in an open state, and no cap is attached.

  The air leak tester 1 is called a differential pressure type, and its basic configuration is known. Briefly, the air leak tester 1 is branched from a negative pressure source 10 (test pressure source) including a vacuum pump, a common passage 20 having one end connected to the negative pressure source 10, and the other end of the common passage 20. The master side branch passage 21 and the workpiece side branch passage 22 are provided. A branch point of these branch passages 21 and 22 is indicated by a symbol P in the figure.

  The common passage 20 is provided with a switching valve 23 composed of a two-position three-way valve. The switching valve 23 opens the branch passages 21 and 22 to the atmosphere at the off position, and communicates the negative pressure source 10 side with the branch passages 21 and 22 at the on position.

The branch passages 21 and 22 are provided with normally open on-off valves 24 and 25 (blocking means), respectively. The on-off valves 24 and 25 and the switching valve 23 described above are electromagnetically driven in this embodiment, but may be air-driven.
A master container 26 is provided at the end of the master side branch passage 21. Note that the master container 26 may be omitted to close the end.

In the common passage 20, a pressure sensor 27 for monitoring the test pressure is connected to the branch point P side from the switching valve 23.
In the work side branch passage 22, a pressure sensor 28 is also connected to the end side of the on-off valve 25.

  The air leak tester 1 further includes a differential pressure sensor 29 and a controller 30. The two ports of the differential pressure sensor 29 are connected to the end sides of the on-off valves 24 and 25 in the branch passages 21 and 22 so as to detect the differential pressure between the branch passages 21 and 22.

The controller 30 sequentially controls the switching valve 23, the on-off valves 24 and 25 and a pressing device 60 described later as described later, receives detection signals from the pressure sensors 27 and 28 and the differential pressure sensor 29, and receives a bottle. It is determined whether or not there is a leak in 100, that is, whether the bottle 100 is a non-defective product or a defective product. Based on the determination result, the display device is controlled and the device that carries out the bottle is controlled.
The pressure sensors 27 and 28, the differential pressure sensor 29, and the controller 30 are provided as detection means.

  The air leak tester 1 of this embodiment further includes a pedestal 40. The pedestal 40 is constituted by a disk-shaped thick seal member 41 (annular seal portion) made of an elastic material such as urethane rubber, and is fixed on a base 50 such as a table or a conveyor. Yes.

The upper surface of the seal member 41 is a horizontal and flat surface on the workpiece side.
In the center of the seal member 41, a metal pipe 22a constituting the end portion of the work side branch passage 22 passes vertically. An opening of the pipe 22 a located on the upper surface of the seal member 41 is provided as a pressure detection port 45.

  In the present embodiment, the entire upper surface of the seal member 41, that is, the entire upper surface of the pedestal 40 is provided as the seal surface region 46.

  The air leak tester 1 according to the present embodiment further includes a pressing device 60 disposed just above the pedestal 40. The pressing device 60 comprises an air cylinder, and a pressing portion 62 is fixed to the lower end of the rod 61 so as to move in the vertical direction.

  In the above configuration, the molded bottle 100 is placed on the pedestal 40 by a transfer device (not shown). At this placement position, the central axis L of the bottle 100 coincides with the pressure detection port 45 of the pedestal 40, and the annular portion 103 a of the bottom 103 of the bottle 100 abuts the seal surface region 46.

  When the annular portion 103 a is in contact with the seal member 41, for example, a pressure detection space 70 of about 1/20 of the internal volume of the bottle 100 is formed between the upper surface of the base 40 and the concave portion 103 b of the bottom portion 103 of the container 100. Is done. The pressure detection port 45 is connected to the pressure detection space 70.

With the bottle 100 set, the sequence control of the controller 30 is started. This will be described in order as follows.
The pressing portion 62 of the pressing device 60 descends and presses the opening edge 102a of the neck portion 102 of the bottle 100 with a relatively small force. Thereby, the bottle 100 is stably supported in the standing state, and the annular portion 103a of the bottle 100 hits the seal surface region 46 of the seal member 41 with the pressing force, and seals the pressure detecting space 70.

Next, the switching valve 23 is turned on, and the branch passages 21 and 22 are sucked into vacuum to make negative pressure. As a result, a negative test pressure is supplied to the pressure sensing space 70. In this embodiment, since the pressure detection space 70 becomes negative pressure, a force that pulls the bottom 103 of the container 100 toward the base 40 works, and the sealing performance between the annular portion 103a and the seal surface region 46 can be improved. .
In the pressing step and the test pressure supplying step, the seal member 41 is elastically deformed. The continuity of the annular portion 103a in the plane perpendicular to the central axis L described above allows a slight variation in the axial position, and the annular portion 103a and the seal are sealed by elastic deformation of the seal member 41. What is necessary is just to ensure the adhesiveness between the members 41.

Next, the on-off valves 24 and 25 are turned on to shut off the branch passages 21 and 22 from the negative pressure source 10 and wait for a predetermined time.
After a predetermined time has elapsed, the controller 30 reads the detection value of the differential pressure sensor 29.

When there is no pinhole in the bottom portion 103, the pressure in the pressure detection space 70 does not increase, and the detected value of the differential pressure sensor 29 falls below the threshold value, so the controller 30 determines that “no leakage”.
When there is a pinhole in the bottom 103, the atmospheric pressure air in the bottle 100 leaks into the space 70, so that the pressure in the pressure detection space 70 rises. As a result, the detection value of the differential pressure sensor 29 has a threshold value. Therefore, the controller 30 determines that “leak is present”.

The pressure change in the pressure detection space 70 corresponds to the ratio of the leak amount from the pinhole of the bottom 103 to the volume of the pressure detection space 70, and the volume of the pressure detection space 70 is larger than the volume of the bottle 100. Since it is very small, the detection sensitivity is enhanced, and leakage due to a minute (for example, several tens of microns or less) pinhole can be detected. Further, the waiting time for detecting the pressure change is short, and the required inspection time is short, for example, 1 to 2 seconds.
The bottom portion 103 of the bottle 100 is harder than the body portion 101 in order to ensure the self-supporting property of the bottle, and the deformation at the time of applying the test pressure is small, so that there is no trouble in detecting the pressure change.
Note that when the test pressure is set to a negative pressure, noise due to a temperature change of the bottle 100 can be suppressed. Therefore, it is possible to detect leakage during cooling after the bottle 100 is formed.
When the test pressure is negative, the pressing device 60 can be omitted.

  In the present embodiment, the controller 30 reads the detected pressure of the pressure sensor 28 after the on / off valves 24 and 25 are turned on and compares them with a threshold value. When the diameter of the pinhole in the bottom portion 103 is large, the pressure in the pressure detection space 70 rapidly increases and the detected pressure exceeds the threshold value, so that it is determined as “large leak”.

  The controller 30 may read the detected pressure of the pressure sensor 27 when supplying the test pressure before the on-operation of the on-off valves 24 and 25 and compare it with a threshold value. If the diameter of the pinhole in the bottom portion 103 is large, the test pressure does not reach the set value after the switching valve 23 is turned on, and therefore, it is determined as “large leak”.

  When the leak detection step is completed, the controller 30 turns off the valves 23 to 25 and raises the pressing portion 62 of the pressing device 60 to return the air leak tester 1 to the initial state. Thereafter, the unloading device divides the bottle 100 into a non-leak good product and a non-leak defective product, and then unloads them from the pedestal 40.

In the first embodiment, a compressed air source (positive pressure source) may be used instead of the negative pressure source 10 as a test pressure source. In this case, when a positive test pressure is supplied to the pressure detection space 70 and there is a pinhole in the bottom 103, the air in the pressure detection space 70 leaks into the bottle 100 and a pressure drop occurs. This pressure drop is detected based on the differential pressure information from the differential pressure sensor 29 and the pressure information from the pressure sensors 27 and 28, and the presence or absence of leakage is determined. In this embodiment, a pressing means (for example, the pressing device 60 shown in the figure) for pressing the bottle 100 against the pedestal 40 against the positive pressure of the pressure detection space 70 is necessary.
In the first embodiment, since a wide area is the sealing surface region 46, containers of various sizes (containers having different diameters of the annular portion 103a) can be set while ensuring sealing properties.

  Next, another embodiment of the present invention will be described with reference to the drawings. In each embodiment, the same number is attached | subjected to the structure part corresponding to embodiment preceded, and the detailed description is abbreviate | omitted.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the test pressure is supplied from the neck 102 of the bottle 100. Details will be described below.
The air leak tester has a test pressure supply passage 80. A compressed air source 10A (test pressure source) is connected to the base end of the air leak tester, and a switching valve 81 comprising a two-position three-way valve is provided in the middle. .

  The pressing portion 62 of the pressing device 60 of the second embodiment has a base portion 62a and a seal member 62b made of an elastic material attached to the lower surface thereof. In the pressing portion 62, an end portion 80a of the test pressure supply passage 80 is formed. The end portion 80a is opened at the center of the lower surface of the seal member 62b, and this opening is provided as a test pressure supply port 85.

  In the second embodiment, the master-side passage 21 and the workpiece-side passage 22 are not connected to the compressed air source 10A and are connected to the atmosphere via the on-off valves 24 and 25, respectively.

  In the second embodiment having the above configuration, the steps from setting the bottle 100 to the base 40 and pressing the pressing portion 62 of the pressing device 60 against the opening edge 102a of the neck portion 102 of the bottle 100 are the same as those in the first embodiment. . However, in the present embodiment, the inside of the bottle 100 is also sealed in the same manner as the pressure detection space 70 by the seal member 62b.

Next, the on-off valves 24 and 25 are closed to shut off the master side passage 21 and the work side passage 22 from the atmosphere, and the switching valve 81 is turned on to supply the compressed air from the compressed air source 10A to the test pressure supply port 85. To the bottle 100 and wait for a predetermined time to elapse.
The on / off valves 24 and 25 may be turned on and off simultaneously with the on / off operation of the switching valve 23. When the on / off valves 24 and 25 are turned on later, the influence of the minute deformation of the bottom 103 can be eliminated.
After a predetermined time has elapsed, the controller 30 reads the detection value of the differential pressure sensor 29.

When there is no pinhole in the bottom portion 103, the pressure in the pressure detection space 70 does not increase, and the detection value of the differential pressure sensor 29 falls below the threshold value, so the controller 30 determines that “no leakage”.
When there is a pinhole in the bottom 103, the compressed air in the bottle 100 leaks into the space 70, so that the pressure in the pressure detection space 70 increases, and as a result, the detection value of the differential pressure sensor 29 exceeds the threshold value. The controller 30 determines that “leak is present”.

  Similar to the first embodiment, since the volume of the pressure detection space 70 is very small compared to the volume of the bottle 100, the detection sensitivity is high and leakage due to a minute pinhole can be detected. Further, the waiting time for the pressure detection can be shortened.

  In this embodiment, the controller 30 also reads the detected pressure of the pressure sensor 28 after the switching valve 81 and the on-off valves 24 and 25 are turned on and compares them with a threshold value. When the diameter of the pinhole in the bottom portion 103 is large, the pressure in the pressure detection space 70 rapidly increases and the detected pressure exceeds the threshold value, so that it is determined as “large leak”.

Next, modifications of the pedestal used in the first and second embodiments will be described with reference to FIGS.
The pedestal 40 ′ shown in FIG. 3 is entirely formed of a seal member 41 ′ as in the above embodiment, and a convex portion 47 is formed at the center of the upper surface. The pressure detection port 45 is located at the center of the top surface of the convex portion 47.

  When the pedestal 40 ′ of FIG. 3 is used, the convex portion 47 of the pedestal 40 ′ enters the concave portion 103b of the bottom portion 103 of the container 100 with the bottle 100 set, and the volume of the pressure detection space 70 can be reduced. Leak detection can be performed with higher accuracy and in a shorter time.

  A pedestal 40 ″ shown in FIG. 4 has a metal pedestal main body 42 and an annular seal member 43 (seal part) embedded in the upper surface of the pedestal main body 42. A vertical hole is formed, and an upper end opening thereof is provided as the pressure detection port 45. In the present embodiment, only the upper surface of the seal member 43 is provided as the seal surface region 46. In the present embodiment, the pedestal is provided. Although the convex part 47 is formed in the main body 42, this convex part 47 may not be.

FIG. 5 shows a pedestal 90 when a bottle 100 ′ having a different shape is an inspection target. The peripheral edge of the bottom 103 ′ of the bottle 100 ′ has a wave shape and does not form a continuous ring on a plane orthogonal to the central axis of the bottle 100 ′. In this case, even if the bottom portion 103 ′ is brought into contact with the pedestal 90, a gap 109 is formed between the peripheral edge portion 103 a ′ and the pedestal 90, so that the recess 103 b ′ cannot be sealed.
However, the bottle 100 ′ has an annular portion 101a as shown in FIG. 6 below the trunk portion 101 ′ (in the vicinity of the bottom portion 103 ′). The contour (outer periphery contour) of the cross-sectional shape of the annular portion 101a is composed of a convex curve and a straight line. This outline may be composed of only a convex curve such as a circle.

  In order to detect the leakage of the pinhole at the bottom 103 'of the bottle 100' as described above, the base 90 shown in FIG. 5 is required. The pedestal 90 has a bottom portion 91 and a cylindrical portion 92, and a concave portion 93 opened upward by the bottom portion 91 and the cylindrical portion 92 is formed. A pressure detection port 45 is formed at the center of the bottom 91. A seal member 95 (seal part) made of an annular elastic material is attached to the inner periphery of the cylindrical part 92. The inner peripheral shape of the cylindrical portion 92 and the shape of the seal member 95 correspond to the annular portion 101a of the bottle 100 '.

The bottle 100 ′ is set so that the bottom 103 ′ and the lower part of the body 101 ′ are accommodated in the recess 93 of the base 90. In this state, the seal member 95 comes into close contact with the annular portion 101a of the body portion 101 ′ of the bottle 100 ′, thereby sealing the pressure measurement space 70 ′ of the base 90 and the bottle 100 ′. The pressure detection space 70 ′ is constituted by a space between the bottle 100 ′ below the seal member 95 and the pedestal 90.
Since the leak detection is the same as that of the first embodiment of FIG. 1 or the second embodiment of FIG. 2, its detailed description is omitted.

  The present invention is not limited to the above-described embodiments, and various aspects can be adopted. For example, the present invention can be applied to various containers having an annular portion that is expected to generate a defect such as a pinhole at the bottom and can be sealed at the periphery of the bottom or the lower portion of the trunk.

  The present invention can be applied to leak detection at the bottom of a container.

1 Air leak tester 10 Negative pressure source (Test pressure source)
10A Compressed air source (test pressure source)
40, 40 ', 40 "pedestal 41, 43 Seal member (seal part)
45 Pressure detection port 60 Press device 70, 70 'Pressure detection space 90 Pedestal 91 Bottom portion 92 Tube portion 95 Seal member (seal portion)
100, 100 'Bottle 101, 101' Body 101a Annular part 102 Neck part 102a Opening edge 103, 103 'Bottom 103a Annular part 103b Recessed part

Claims (7)

In a method for detecting leakage at the bottom of a container,
Prepare a pedestal that has an opening for the pressure detection and is provided with an annular seal so as to surround the pressure detection opening.
By bringing the peripheral part of the bottom of the container or the lower outer periphery of the body part into contact with the seal part of the pedestal, a pressure detection space sealed between the container bottom and the pedestal is formed,
Next, the test pressure from the test pressure source is supplied to the pressure sensing space through the pressure sensing port,
Next, in a state where the test pressure source and the pressure detection space are blocked, a pressure change in the pressure detection space is detected through the pressure detection port, and leakage of the bottom of the container is detected based on the information on the pressure change. Detecting a container leak. In a method for detecting leakage at the bottom of a container,
Prepare a pedestal that has an opening for the pressure detection and is provided with an annular seal so as to surround the pressure detection opening.
By bringing the peripheral part of the bottom of the container or the lower outer periphery of the body part into contact with the seal part of the pedestal, a pressure detection space sealed between the container bottom and the pedestal is formed,
Next, the test pressure from the test pressure source is supplied into the container from the neck opening of the container,
Next, a container leak detection method characterized by detecting a pressure change in the pressure detection space via the pressure detection port and detecting a leak at the bottom of the container based on information on the pressure change. A concave portion is formed at the bottom of the container, and a peripheral portion of the bottom is formed with an annular portion that is continuous on a plane perpendicular to the central axis of the container,
The container leak detection according to claim 1 or 2, wherein the pressure detection space is formed between the container bottom and the pedestal by bringing the annular portion of the container bottom into contact with the seal portion of the pedestal. Method. In the lower part of the body part of the container, an annular part is formed in which the contour of the cross-sectional shape is a convex curve or a convex curve and a straight line,
The pedestal has a bottom part and a cylinder part, the seal part is provided on the inner periphery of the cylinder part, and the pressure detection opening is opened at the bottom part,
By inserting the lower part of the body of the container into the cylindrical part of the pedestal and bringing the annular part formed on the body into contact with the seal part, the pressure detection space is formed between the container bottom and the pedestal. The container leak detection method according to claim 1, wherein the container leak detection method is formed.   The container leak detection method according to claim 1, wherein the test pressure source is a negative pressure source.   The container leak detection method according to claim 1, wherein the opening edge of the neck portion is pressed toward the pedestal in the test pressure supply step and the pressure change detection step of the pressure detection space.   In the apparatus which performs the container leak detection method of Claim 3, the said base has a convex part which penetrates into the recessed part of the said container bottom part, and the said pressure detection opening is opening in the top surface of this convex part A container leak detection device characterized by the above.

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