JP7445439B2 - air leak test equipment - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act (1) Fukuda Co., Ltd. website http://www. fukuda-jp. com/new/ February 12, 2019 (2) Nikkan Kogyo Shimbun published by Nikkan Kogyo Shimbun Co., Ltd. February 14, 2019 (3) Packaging Times published by Nippo Business Co., Ltd. February 18, 2019 (4) Nikkei Sangyo Shimbun published by Nihon Keizai Shimbun Co., Ltd. February 20, 2019 (5) Exhibition at the 5th Interphex Osaka February 20, 2019 (6) At the 21st Interphex Japan Exhibition July 3, 2019 (7) Exhibition at JAPAN PACK 2019 Japan Packaging Industry Exhibition October 29, 2020 (8) Sales to Nipro Co., Ltd. February 26, 2019 (9) Sale to Sumitomo Dainippon Pharma Co., Ltd. March 12, 2019 (10) Sale to Mochida Pharmaceutical Co., Ltd. April 16, 2019 (11) Sale to Kowa Co., Ltd. August 1, 2021 (12) Sales to Takada Pharmaceutical Co., Ltd. September 11, 2020

The present invention relates to an air leak test device for inspecting an object to be inspected (hereinafter referred to as a work) for the presence or absence of defects, and particularly to a device capable of performing an air leak test using two methods.

For example, if there is a defect in the packaging of a packaged drug, it will cause the drug to deteriorate. Therefore, air leak test devices are used to detect whether there are defects in the packaging. Packaging defects include small defects such as pinholes and large defects such as poor seals and tears. Therefore, the air leak test device is required to perform a small leak detection process for detecting small defects and a large leak detection process for detecting large defects.

Patent Document 1 discloses an air leak test device that detects small leaks and large leaks using a first method (so-called tank pressurization method). The device includes a main circuit connecting the pressure source and the work capsule. A first supply valve is interposed between the pressure source and the main circuit. A second supply valve is provided in the main circuit, and the second supply valve divides the main circuit into an upstream circuit section on the pressure source side and a downstream circuit section on the work capsule side. A tank is connected to the upstream circuit section of the main circuit. Both ends of the pressure detection circuit are connected to the downstream circuit section of the main circuit. The pressure detection circuit is provided with a differential pressure sensor and a pressure detection valve.

Initially, with the first supply valve open and the second supply valve closed, a set pressure is applied to the tank from the pressure source.
Next, by closing the first supply valve and opening the second supply valve, the tank at the set pressure and the downstream circuit section of the main circuit, which is closed at atmospheric pressure, are brought into communication. As a result, a test pressure intermediate between the set pressure and atmospheric pressure is applied inside the work capsule. Based on the tank pressure detected at this time, it is determined whether there is a major leak.
Next, the pressure detection valve of the pressure detection circuit is closed, and the presence or absence of a small leak is determined based on the differential pressure detected by the differential pressure sensor.

Patent Document 2 discloses a second type (so-called tank partial pressure type) air leak test device. In this method, contrary to the first method (tank pressurization method), large leak detection is performed after small leak detection. The device includes a pressure source, a main circuit, and a supply valve interposed between the pressure source and the main circuit. The main circuit is branched into two branch paths: a master side branch path to which the master container is connected at the end, and a work side branch path to which the work capsule is connected to the end. A pressure detection valve is provided in each of the master side branch path and the work side branch path. A differential pressure sensor is connected between the master side branch path and the work side branch path on the downstream side of these pressure detection valves. Further, on the downstream side of the pressure detection valve, tanks are connected to the master side branch path and the work side branch path through tank valves, respectively.

In the apparatus of Patent Document 2, a set pressure as a test pressure is first supplied from the pressure source to the master side branch path and the work side branch path. Next, with the pressure detection valve closed, the differential pressure between the master side branch path and the work side branch path is detected by the differential pressure sensor, and the presence or absence of a small leak is determined based on this detected differential pressure. Next, the tank valve is opened, and the master side branch path and the work side branch path at the set pressure are communicated with the tank at atmospheric pressure. As a result, a pressure intermediate between the set pressure and atmospheric pressure is applied inside the work capsule. Based on the differential pressure detected by the differential pressure sensor at this time, it is determined whether there is a large leak.

JP 2017-129477 (Figure 1) WO2017/208543 publication (Figure 1)

As will be described later, the first method and the second method each have advantages and disadvantages. There are a wide variety of workpieces to be inspected, and there are workpieces for which the first method is suitable and workpieces for which the second method is suitable. Therefore, when performing an air leak test on a workpiece that is suitable for the first method and the second method, it is necessary to prepare two types of air leak test equipment, one for the first method and the other for the second method, which increases equipment costs. invite.

The present invention has been made to solve the above problems, and is an air leak test device comprising: (a) a pressure source capable of supplying atmospheric pressure or a pressure including a reference pressure close to atmospheric pressure and a set pressure; and (b) a work capsule containing a work to be inspected; c) a main circuit connecting the pressure source and the work capsule; d) a first supply valve interposed between the pressure source and the main circuit; ) a second supply valve provided in the main circuit and dividing the main circuit into an upstream circuit section on the pressure source side and a downstream circuit section on the work capsule side; f) a second supply valve in the upstream circuit section of the main circuit; a tank connected via a branch circuit; g) a tank valve provided in the branch circuit to communicate and cut off the tank from the main circuit; and h) a tank valve connected to the upstream circuit section of the main circuit. (k) a pressure detection circuit whose both ends are connected to a downstream circuit section of the main circuit; (c) a pressure detection valve provided in the pressure detection circuit; and (c) a pressure detection circuit provided in the pressure detection circuit; a differential pressure sensor having a work side port connected to the work capsule via the downstream circuit section of the main circuit and a reference side port connected to the pressure detection valve; and c) an atmospheric release valve connected to the main circuit. and s) control of the supply pressure of the pressure source, sequence control of the first supply valve, the second supply valve, the tank valve, the pressure detection valve, and the atmosphere release valve, and the detection pressure from the pressure sensor. The present invention is characterized by comprising a control/judgment means for determining whether or not there is a large leak in the work based on the pressure difference detected by the differential pressure sensor, and determining whether or not there is a small leak in the work based on the differential pressure detected by the differential pressure sensor.

According to the above configuration, pressure can be supplied from the pressure source to the tank and from the pressure source to the main circuit independently, so it is possible to select the air leak test method depending on the workpiece. Become.

Preferably, the pressure sensor is an absolute pressure sensor. This allows a highly accurate air leak test to be performed without being affected by changes in external atmospheric pressure.

Preferably, the main circuit further includes a reference leakage circuit connected between the upstream circuit section and the downstream circuit section, two reference leakage valves provided in the reference leakage circuit, and the reference leakage circuit. and a reference leaker provided between the two reference leak valves and having an orifice.
According to the above configuration, it is possible to generate a reference leak simulated as a small leak in the workpiece using the reference leakage device for the purpose of calibrating the apparatus or the like. Moreover, since the upstream circuit section of the main circuit can be set to the reference pressure defined by absolute pressure, the differential pressure can be detected with high precision by the differential pressure sensor in the event of a reference leak.

As a specific aspect, it is possible to selectively perform the first method air leak test and the second method air leak test,
a. In the first method, the control/judgment means:
opening the first supply valve and the tank valve, closing the second supply valve, and supplying a first set pressure from the pressure source to the tank;
While the tank valve is closed and the pressure inside the tank is maintained at the first set pressure, the first supply valve, the second supply valve, and the pressure detection valve are opened, and the pressure source is connected to the main circuit and the pressure source. supplying the reference pressure to the detection circuit;
The first supply valve is closed, the second supply valve, the pressure detection valve, and the tank valve are opened, and the tank is communicated with the main circuit and the pressure detection circuit, thereby connecting the main circuit and the pressure detection circuit. a large leak detection step of setting the pressure detection circuit to a test pressure intermediate between the reference pressure and the first set pressure, and determining whether there is a large leak in the workpiece based on the detected pressure from the pressure sensor at this time;
a small leak detection step of closing the pressure detection valve and determining whether there is a small leak in the workpiece based on the differential pressure detected from the differential pressure sensor;
Execute in the above order,
b. In the second method, the control/judgment means:
opening the first supply valve and the tank valve and closing the second supply valve to supply the reference pressure from the pressure source to the tank;
While the tank valve is closed and the inside of the tank is maintained at the reference pressure, the first supply valve, the second supply valve, and the pressure detection valve are opened, and the pressure source is connected to the main circuit and the detection valve. a step of supplying a second set pressure as a test pressure to the pressure circuit;
a small leak detection step of closing the first supply valve and keeping the pressure detection valve closed, and determining whether there is a small leak in the workpiece based on the differential pressure detected from the differential pressure sensor;
a large leak detection step of opening the tank valve to bring the tank and the main circuit into communication, and determining whether or not there is a large leak in the workpiece based on the detected pressure from the pressure sensor;
Execute in the above order.

According to the above configuration, it is possible to select and implement the first and second methods depending on the product type and the like.
Preferably, the first set pressure in the first method can be selected between positive pressure and negative pressure, and the second set pressure in the second method can also be selected between positive pressure and negative pressure.

Preferably, when performing a first type of air leak test using the first set pressure of negative pressure, or when performing a second type of air leak test using the second set pressure of negative pressure, the above control is preferably performed. - After the large leak detection step and the small leak detection step are completed, the determining means opens the release valve with supply of positive pressure from the pressure source to open the main circuit to the atmosphere.
According to the above configuration, it is possible to reliably eliminate sticking between the structural members of the work capsule due to negative pressure, and the work capsule can be opened smoothly.

Preferably, the control/judgment means has an information input section for inputting information including the product type and test pressure of the workpiece, and selects the first and second methods according to the input product type and test pressure. Choose one.
According to the above configuration, it is possible to reduce the burden on the user who selects a test method.

According to the present invention, it is possible to provide an apparatus that can perform multiple types of air leak tests.

1 is a schematic diagram showing a circuit configuration of an air leak test device according to an embodiment of the present invention. 2 is a time chart of an air leak test of a tank pressurization method using positive pressure, which is performed in the apparatus of FIG. 1. FIG. This is a time chart of an air leak test using the tank pressurization method using negative pressure, which is performed with the same device. This is a time chart of a tank partial pressure type air leak test using positive pressure performed by the same device. This is a time chart of a tank partial pressure type air leak test using negative pressure performed by the same device. FIG. 2 is a circuit configuration diagram in which further components are added to the device of FIG. 1; It is a flowchart for method selection executed by the same device.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The air leak test device schematically shown in FIG. 1 includes a pressure source 1, a work capsule 2, and a main circuit 3 connecting the pressure source 1 and the work capsule 2. In this specification, the pressure source 1 side is defined as the upstream side, and the work capsule 2 side is defined as the downstream side, regardless of whether the supplied pressure is positive or negative.

The pressure source 1 can selectively supply a positive pressure, a negative pressure, and a reference pressure slightly higher than atmospheric pressure, each defined as an absolute pressure. That is, the pressure source 1 includes a regulator and can supply a set pressure in response to feedback of detected pressure from an absolute pressure sensor 6 (pressure sensor), which will be described later.

The work capsule 2 has a capsule main body 2a that accommodates a work W to be detected, and a top plate 2b (lid; closing member) that closes the upper end opening of the capsule main body 2a. The capsule main body 2a is slidable between a workpiece loading/unloading position (indicated by an imaginary line) away from the top plate 2b and a detection position (indicated by a solid line) directly below the top plate 2b. The capsule body 2a and the top plate 2b are clamped by a clamp mechanism when the capsule body 2a is at the detection position, thereby making it possible to seal the interior space of the work capsule 2.

A normally open first supply valve SV1 is arranged between the pressure source 1 and the main circuit 3. The main circuit 2 is provided with a normally closed second supply valve SV2. The main circuit 3 is divided into an upstream circuit section 3a and a downstream circuit section 3b by the second supply valve SV2.

A branch circuit 4 is connected to the upstream circuit section 3a of the main circuit 3. This branch circuit 4 is provided with a normally open tank valve SV3, and a tank 5 is further connected to the terminal end of the tank valve SV3. An absolute pressure sensor 6 independent from the tank 5 is also connected to the upstream circuit section 3a.

Both ends of a pressure detection circuit 7 are connected to the downstream circuit section 3b of the main circuit 3, and the pressure detection circuit 7 is provided with a differential pressure sensor 8 and a normally open pressure detection valve SV4. One port 8a (work side port) of the differential pressure sensor 8 is connected to the work capsule 2 via the downstream circuit section 3b of the main circuit 3. The other port 8b (reference side port) is connected to the pressure detection valve SV4. An open circuit 9 connected to the atmosphere is connected to the downstream circuit section 3b of the main circuit 3. The open circuit 9 is provided with a normally open open valve SV5.
Note that the valves SV1 to SV5 mentioned above are air-operated valves.

The air leak test device further includes a controller 10 (control/calculation means). The controller 10 is connected to the regulator of the pressure source 1 to control the supply pressure, the slide mechanism and clamp mechanism for the work capsule 2, sequence control of the valves SV1 to SV5, and the detection from the absolute pressure sensor 6. Based on the pressure, it is determined whether there is a large leak in the workpiece, and based on the differential pressure detected by the differential pressure sensor 8, it is determined whether there is a small leakage in the workpiece.

The air leak test device having the above configuration can perform an air leak test using two methods using the controller 10. The two methods are distinguished depending on whether large leakage or small leakage of the workpiece W is to be performed first.
The first method is a method in which large leaks are detected first, and is referred to as a tank pressurization method because the pressure stored in the tank 5 is supplied toward the main circuit 3 of the reference pressure as described later.
The second method is a method in which a small leak is detected first, and is called a tank partial pressure method because the pressure of the main circuit 3 is divided into the tanks 5 having a reference pressure as described later.

Hereinafter, the air leak test of the tank pressurization method and the tank partial pressure method will be described with reference to the time charts of FIGS. 2 to 5 for cases in which positive pressure and negative pressure are used, respectively. In these time charts, hatching at each step indicates that each valve SV1 to SV5 is open, and no hatching indicates a closed state.

Tank pressurization method (positive pressure)
First, a tank pressurization type air leak test using positive pressure will be explained with reference to FIG.
(Initial process)
Valves SV1 to SV5 are in the state shown in FIG. Since the first supply valve SV1 is open and the second supply valve V2 is closed, a positive first set pressure Px is applied from the pressure source 1 to the upstream circuit section 3a of the main circuit 3. This first set pressure Px is maintained constant because the regulator of the pressure source 1 is controlled in response to feedback from the absolute pressure sensor 6. Furthermore, since the tank valve SV3 is open, the first set pressure Px is also supplied to the tank 5.
On the other hand, since the pressure detection valve SV4 and the release valve SV5 are open, the downstream circuit section 3b of the main circuit 3 and the pressure detection circuit 7 are open to the atmosphere.

(slide process)
Next, while maintaining the valves SV1 to SV5 as they were in the previous step, the capsule body 2a containing the workpiece W is slid from the loading/unloading position to the detection position below the top plate 2b.

(Tank shutoff/clamping process)
Next, the capsule body 2a and the top plate 2b are clamped to seal the internal space of the work capsule 2. In this clamping step, the tank valve SV3 is turned on and closed, thereby cutting off the tank 5 from the upstream circuit section 3a of the main circuit 3. Thereby, the tank 5 is maintained at the first set pressure Px.

(Standard pressure supply process)
Next, while leaving the valves SV1, SV3, and SV4 in the same state as in the previous step, the open valve SV5 is turned on to close it, and the main circuit 3 is cut off from the outside. At approximately the same time or immediately after this, the second supply valve SV2 is turned on and opened, and a reference pressure Pr close to atmospheric pressure is supplied from the pressure source 1. As a result, the main circuit 3, pressure detection circuit 7, and work capsule 2 become at the reference pressure Pr. The tank 5 remains maintained at the first set pressure Px.

(Tank communication/test pressure supply process)
Next, after turning on the first supply valve SV1 to bring it into a closed state, the tank valve SV3 is turned off and brought into an open state, thereby communicating the tank 5 with the main circuit 3. The other valves are kept the same as in the previous step. As a result, air at the first set pressure Px from the tank 5 flows into the main circuit 3. As a result, the pressure of the entire closed circuit including the main circuit 3, pressure detection circuit 7, and work capsule 2 becomes the positive test pressure _Pt1 . This test pressure _Pt1 is an intermediate value between the reference pressure Pr and the first set pressure Px, and is expressed by the following equation.
Pt ₁ = (Px・Vt+Pr・Vc)/(Vt+Vc)...(1)
However, Vt is the tank volume, and Vc is the volume of the main circuit 3, pressure detection circuit 7, and closed circuit excluding the tank 5, which includes the work capsule 2 (however, the volume of the work capsule 2 depends on the inner surface of the work capsule 2). subtract the volume of the workpiece W from the defined volume). These volumes Vt and Vc are known.

(Large leak detection process)
Next, with the valves SV1 to SV5 maintained as they were in the previous process, it is determined whether there is a large leak based on the absolute pressure of the closed circuit detected by the absolute pressure sensor 6. If the workpiece W has no major defects such as poor sealing or tears in the packaging, the pressure detected by the absolute pressure sensor 6 will be maintained at the test pressure Pt ₁ estimated by the above formula (1), but if there is a major defect If there is, the air at the test pressure Pt ₁ in the work capsule 2 instantly enters the work W (large leak), and the pressure detected by the absolute pressure sensor 6 increases by that much, the test pressure Pt ₁ decreases from
The controller 10 determines that there is no major leak in the workpiece W if the difference between the pressure detected by the absolute pressure sensor 6 and the test pressure _Pt1 is within the threshold, and if this difference exceeds the threshold, there is a major leak. Yes, that is, it is determined that the workpiece W has a large defect.

(Pressure stabilization process)
Next, while maintaining the valves SV1, SV3, and SV5 as they were in the previous process, the second supply valve SV2 is turned off and closed, thereby opening the upstream circuit section 3a and the downstream circuit section 3b of the main circuit 3. By turning on the pressure detection valve SV4 and closing it, the pressure detection circuit 7 is divided into two parts and cut off. This state is maintained for a predetermined period of time to stabilize the pressures in the downstream circuit section 3b of the main circuit 3 and the pressure detection circuit 7.

(Small leak detection process)
Next, the presence or absence of a small leak is determined based on the differential pressure detected by the differential pressure sensor 8 while maintaining the valves SV1 to SV5 as they were in the previous process. In this state, the two ports 8a and 8b of the differential pressure sensor 8 are blocked from each other. That is, the work side port 8a is connected to the work capsule 2 via the downstream circuit section 3b of the main circuit 3. The reference side port 8b is connected to a portion of the pressure detection circuit 7 between the differential pressure sensor 8 and the pressure detection valve SV4. The pressure at the reference side port 8b is maintained at test pressure _Pt1 .

If there is no small defect such as a pinhole in the packaging of the workpiece W, the pressure on the workpiece side port 8a side is also maintained at the test pressure _Pt1 . If the differential pressure detected by the differential pressure sensor 8 is within the threshold, the controller 10 determines that there is no small leak, that is, that there is no small defect in the workpiece W.
If the packaging of the workpiece W has a small defect such as a pinhole, air at the test pressure _Pt1 gradually enters the workpiece W. As a result, the pressure in the downstream circuit section 3b of the main circuit 3 and the work capsule 2 is gradually reduced, and the pressure in the work port 8a becomes lower than the pressure in the reference port 8b (test pressure Pt ₁ ). When the differential pressure detected by the differential pressure sensor 8 exceeds a threshold value, the controller 10 determines that there is a small leak, that is, there is a small defect.

(Atmospheric release process)
Next, while maintaining the valves SV1 and SV3 as they were in the previous step, the second supply valve SV2 is turned on and opened, the pressure detection valve SV4 is turned off and opened, and the release valve SV5 is turned off and opened. As a result, the circuit including the main circuit 3 and the pressure detection circuit 7, the tank 5, and the work capsule 2 are opened to the atmosphere (exhausted) while being cut off from the pressure supply source 1.

(Clamp release process)
Next, the clamp on the work capsule 2 is released while maintaining the valves SV1 to SV5 as they were in the previous process.
(Sliding process)
Finally, by sliding the capsule body 2a containing the inspected workpiece W, it is returned from the detection position corresponding to the top plate 2b to the loading/unloading position, and the workpiece W is taken out from the capsule body 2a. In this step, the first supply valve SV1 is turned off and opened, and the second supply valve SV2 is turned off and closed, thereby returning all the valves SV1 to SV5 to the same state as in the initial step.

In the tank pressurization method, the supply pressure of the pressure source 1 is reduced to the reference pressure Pr only in the reference pressure supply process, but is maintained at the positive first set pressure Px in other processes.

Tank pressurization method (negative pressure)
(From initial process to small leak detection process)
Next, an air leak test using a tank pressurization method using negative pressure will be described with reference to FIG. The operations of valves SV1 to SV5 during the initial process, slide process, tank shutoff/clamp process, standard pressure supply process, tank communication/test pressure supply process, large leak detection process, pressure stabilization process, and small leak detection process are as described above. This is the same as the positive tank pressurization air leak test method. The pressure source 1 supplies a negative first set pressure Px' from the initial process to the tank shutoff/clamp process, and supplies the reference pressure Pr in the reference pressure supply process.

In the tank communication/test pressure supply process, the tank 5 with the negative first set pressure Px' and the closed circuit (including the main circuit 3, pressure detection circuit 7, and work capsule 2) with the reference pressure Pr communicate with each other, and the tank A first set pressure Px' with a negative pressure of 5 is supplied to the closed circuit of the reference pressure Pr. In other words, air at the reference pressure Pr in the closed circuit flows into the negative pressure tank 5. As a result, the pressure in the closed circuit and the tank 5 becomes the negative test pressure Pt ₁ ′. This test pressure _Pt1 ' is an intermediate value between the reference pressure Pr and the first set pressure Px' of negative pressure, and in the above equation (1), the first set pressure Px of positive pressure is set to the first set pressure Px of negative pressure. It can be obtained by replacing it with Px'.

If there is a major defect in the packaging of the workpiece W, the air in the workpiece W may instantly leak ( _largely (leakage), the pressure detected by the absolute pressure sensor 6 becomes higher than the test pressure _Pt1 ' by that amount. In the large leak detection step, as in the case of positive pressure, it is determined whether there is a large leak in the workpiece W based on the difference between the pressure detected by the absolute pressure sensor 6 and the test pressure _Pt1 '.

In the small leakage detection step, if the packaging of the workpiece W has a small defect such as a pinhole, the air inside the workpiece W leaks little by little into the workpiece capsule 2 at a negative test pressure _Pt1 '. As a result, the pressure in the downstream circuit section 3b of the main circuit 3 and the work capsule 2 gradually increases, and the pressure at the work side port 8a of the differential pressure sensor 8 becomes lower than the pressure at the reference side port 8b (test pressure _Pt1 '). It gets expensive. The controller 10 determines whether there is a small leak based on the differential pressure detected by the differential pressure sensor 8, as in the case of positive pressure.

In this embodiment, the supply pressure of the pressure source 1 is returned to the negative first set pressure Px' after the reference pressure supply process and from the test pressure supply process to the small leak detection process.

(From the atmosphere opening process to the sliding process)
In the atmosphere release process and the clamp release process, the positive pressure tank pressurization air leak test and valve operation are different. Specifically, in the atmosphere opening process, all the valves SV1 to SV5 are opened, and the supply pressure of the pressure source 1 is switched from negative pressure Px' to positive pressure. Note that the positive pressure supplied in this atmosphere opening step may be lower than the first set pressure Px of the positive pressure described above, or may be the reference pressure Pr or slightly higher than the reference pressure Pr.

In the atmosphere opening step, the atmosphere flows into the work capsule 2 from the atmosphere opening valve SV5, and positive pressure air from the pressure source 1 flows into the work capsule 2. The work capsule 2 is under negative pressure until the previous process, and there is a possibility that the capsule body 2a is stuck to the top plate 2b, but by introducing the positive pressure air, the sticking can be reliably released. can. As a result, in the sliding process, the capsule main body 2a can be smoothly slid from the detection position below the top plate 2b to the loading/unloading position.
In the slide process, the second supply valve SV2 is turned off and closed, and the supply pressure of the pressure source 1 returns to the predetermined negative pressure Py, resulting in the same state as in the initial process.

Tank partial pressure method (positive pressure)
Next, a tank partial pressure air leak test method using positive pressure will be described with reference to FIG.
(Initial process)
A pressure source 1 supplies a reference pressure Pr. Since the valves SV1 to SV5 are in the state shown in FIG. 1, and the first supply valve SV1 is open and the second supply valve V2 is closed, the reference pressure Pr from the pressure source 1 is applied to the upstream circuit section 3a of the main circuit 3. Granted. Since the tank valve SV3 is open, the reference pressure Pr is also supplied to the tank 5. The downstream circuit section 3b of the main circuit 3 is open to the atmosphere.

(Sliding process)
Next, while maintaining the valves SV1 to SV5 as they were in the previous step, the capsule body 2a containing the workpiece W is slid to the detection position corresponding to the top plate 2b.
(Tank shutoff/clamping process)
Next, the capsule body 2a and the top plate 2b are clamped to seal the internal space of the work capsule 2. In this step, the tank valve SV3 is turned on and closed, thereby cutting off the tank 5 from the upstream circuit section 3a of the main circuit 3. Thereby, the tank 5 is maintained at the reference pressure Pr. In this embodiment, the second supply valve SV2 is turned on and opened immediately after the tank valve SV3 is closed, and the air at the reference pressure Pr from the pressure source 1 is discharged to the atmosphere from the open valve SV5 through the main circuit 3. Ru.

(Test pressure supply process)
Next, the circuit including the main circuit 3, pressure detection circuit 7, and work capsule 2 is closed by turning on and closing the release valve SV5 while maintaining the valves SV1, SV2, SV3, and SV4 as they were in the previous process. The supply pressure of the pressure source 1 is switched from the reference pressure Pr to the second set pressure Py, which is a positive pressure. As a result, the positive second set pressure Py is supplied to the closed circuit including the main circuit 3, the pressure detection circuit 7, and the work capsule 2. This positive second set pressure Py is provided as a test pressure _Pt2 for detecting a small leak. The two ports 8a, 8b of the differential pressure sensor 8 are subjected to an equal test pressure _Pt2 .

(Pressure stabilization process)
Next, while maintaining the valves SV2, SV3, and SV5 as they were in the previous process, the first supply valve SV1 is turned on and closed to cut off the main circuit 3 from the pressure source 1, and the pressure detection valve SV4 is turned on. Pressure detection circuit 7 is shut off. This state is maintained for a predetermined period of time to stabilize the pressure.

(Small leak detection process)
Next, the presence or absence of a small leak is determined based on the differential pressure detected by the differential pressure sensor 8 while maintaining the valves SV1 to SV5 as they were in the previous process. In this state, the two ports 8a and 8b of the differential pressure sensor 8 are blocked from each other. That is, the work side port 8a is connected to the work capsule 2 via the downstream circuit section 3b of the main circuit 3. The reference side port 8b is connected to a portion of the pressure detection circuit 7 between the differential pressure sensor 8 and the pressure detection valve SV4. The pressure at port 8b is maintained at test pressure _Pt2 .

If there is no small defect such as a pinhole in the packaging of the workpiece W, the pressure on the workpiece side port 8a side is also maintained at the test pressure _Pt2 . As a result, the differential pressure detected by the differential pressure sensor 8 is maintained within the threshold value, and the controller 10 determines that there is no small leak.
If the packaging of the workpiece W has a small defect such as a pinhole, air at the test pressure _Pt2 gradually enters the workpiece W. As a result, the pressure in the work capsule 2 is gradually reduced, the pressure on the work side port 8a side becomes lower than the pressure on the reference side port 8b side (test pressure Pt ₂ ), and the differential pressure detected by the differential pressure sensor 8 exceeds the threshold value. Therefore, the controller 10 determines that there is a small leak.

As described above, the test pressure _Pt2 used for detecting a small leak can be set high because the second set pressure Py supplied from the pressure source 1 can be used as is.

(Large leak detection process)
Next, while maintaining the valves SV1, SV2, and SV5 as they were in the previous step, the tank valve SV3 is turned off and opened, and the pressure detection valve SV4 is turned off and opened. As a result, the air at the positive test pressure Pt ₂ (the second set positive pressure Px) in the main circuit 3 flows into the tank 5 at a lower reference pressure Pr, causing a large pressure leak in the main circuit 3. The test pressure Pt is reduced to ₃ . This test pressure _Pt3 is obtained by replacing the first set pressure Px with the second set pressure Py in the above equation (1).

If there is no major defect in the packaging of the workpiece W, the pressure detected by the absolute pressure sensor 6 is equal to the test pressure _Pt3 . However, if there is a large defect, the inside of the workpiece W has already reached the test pressure _Pt2 , and the pressure in the workpiece capsule ₂ and main circuit 3 is reduced to the test pressure by the amount of air released at this test pressure Pt2. Higher than Pt ₃ . The controller 10 determines that there is no major leak if the difference between the pressure in the main circuit 3 detected by the absolute pressure sensor 6 and the test pressure Pt ₃ is within the threshold, and determines that there is no major leak if it exceeds the threshold. It is determined that there is a leak.

(Atmospheric release process)
Next, while maintaining the valves SV1 to SV4 as they were in the previous process, the release valve SV5 is turned off and opened, thereby opening the main circuit 3, pressure detection circuit 7, tank 5, and work capsule 2 to the atmosphere. (exhausted).
(Clamp release process)
Next, the clamp on the work capsule 2 is released while maintaining the valves SV1 to SV5 as they were in the previous process.
(Sliding process)
Finally, the capsule main body 2a containing the inspected workpiece W is slid and returned from the detection position below the top plate 2b to the loading/unloading position, and the first supply valve SV1 is turned off and opened, and the second By turning off and closing the supply valve SV2, all valves SV1 to SV5 are returned to the same state as in the initial step.

In the above method, the pressure source 1 supplies the reference pressure Pr until the tank cutoff/clamping process, maintains the second set pressure Py of positive pressure from the test pressure supply process to the slide process, and maintains the reference pressure in the initial state. Return to Pr.

Tank partial pressure method (negative pressure)
(From initial process to tank communication/large leak detection process)
Next, a tank partial pressure air leak test method using negative pressure will be described with reference to FIG. The operations of valves SV1 to SV5 during the initial process, sliding process, tank shutoff/clamping process, test pressure supply process, pressure stabilization process, small leak detection process, and tank communication/large leak detection process are for the positive pressure tank described above. This is the same as the pressure method air leak test method. The pressure source 1 supplies a reference pressure Pr from the initial process to the tank shutoff/clamping process, and supplies a negative second set pressure Py' to the negative test pressure from the test pressure supply process to the tank communication/large leak detection process. Supplied as _Pt2 '.

In the small leakage detection step, if there is a small defect such as a pinhole in the packaging of the workpiece W, the air inside the workpiece W leaks little by little into the workpiece capsule 2 at a negative test pressure Pt ₂ ′. As a result, the pressure in the downstream circuit section 3b of the main circuit 3 and the work capsule 2 gradually increases, and the pressure at the work side port 8a of the differential pressure sensor 8 becomes lower than the pressure at the reference side port 8b (test pressure _Pt2 '). It gets expensive. The controller 10 determines whether there is a small leak based on the differential pressure detected by the differential pressure sensor 8, as in the case of positive pressure.

In the tank communication/large leak detection process, if there is no large leak in the workpiece W, the air in the tank 5 at the reference pressure Pr flows into the main circuit 3 at the test pressure _Pt2 ' (second set pressure Py' of negative pressure). The pressure in the main circuit 3 rises to the test pressure _Pt3 '. This test pressure Pt ₃ ′ is obtained by replacing the first set pressure Px with the second set pressure Py′, which is a negative pressure, in the above equation (1).

In the tank communication/large leak detection process, if there is a large leak in the workpiece W, the test pressure Pt ₂ ' (negative pressure second set pressure Py') has already been established in the workpiece W before the tank communication/large leakage process. Even if the air in the tank 5 flows in, the test pressure does not rise to _Pt3 '. As a result, the controller 10 can determine whether there is a large leak in the work W based on the difference between the pressure detected by the absolute pressure sensor 6 and the test pressure _Pt3 '.

In this embodiment, the supply pressure of the pressure source 1 is returned to the negative second set pressure Py' after the tank shutoff/clamping process and from the test pressure supply process to the tank communication/large leak detection process. ing.

(From the atmosphere opening process to the sliding process)
The valve operation differs from the tank partial pressure air leak test method using positive pressure in the atmospheric release process and the clamp release process. In the atmosphere release step, the release valve SV5 is turned off and opened, the first supply valve SV1 is turned off and opened (that is, all valves SV1 to SV5 are opened), and the supply pressure of the pressure source 1 is set to the second negative pressure setting. Pressure Py' switches to positive pressure. Note that the positive pressure supplied in this atmosphere opening step may be lower than the second set pressure Py of the positive pressure described above, or may be the reference pressure Pr or slightly higher than the reference pressure Pr. As a result, the atmosphere flows into the work capsule 2 from the atmosphere release valve SV5, and the positive pressure air from the pressure source 1 flows into the work capsule 2. As a result, the grip of the capsule body 2a on the top plate 2b is reliably released, and after the clamp is released, the capsule body 2a can be smoothly slid from the detection position to the loading/unloading position.
In the slide process, the second supply valve SV2 is turned off and closed, and the supply pressure of the pressure source 1 returns to the negative second set pressure Py', resulting in the same state as in the initial process.

In the above tank partial pressure air leak test method using positive pressure or negative pressure, the second supply valve SV2 may be closed in the pressure stabilization step and the small leak detection step. Further, the second pressurizing valve SV2 may be temporarily opened between the initial step and the slide step.

Role of the absolute pressure sensor 6 In this embodiment, the standard pressure controlled by the absolute pressure sensor 6 is used instead of the atmospheric pressure that changes due to weather, etc. Therefore, the large leak detection process and the small leak detection process of the tank pressurization method are performed. The test pressure in the tank partial pressure method can be set with high precision, and the test pressure in the large leak detection process using the tank partial pressure method can be set with high precision. As a result, the accuracy of the air leak test can be improved.

Comparison of tank pressurization method and tank partial pressure method In the tank pressurization method, a tank 5 with a known volume is set to the first set pressure in advance, and the first set pressure of the tank 5 is set to the reference pressure in a closed circuit. The absolute amount of air present in the closed circuit including the tank can be accurately determined. Therefore, a large leak test can be performed accurately.
However, in the tank pressurization method, the test pressure in the small leakage inspection step is an intermediate value between the first set pressure from the pressure source 1 and a reference pressure close to atmospheric pressure, so it cannot be increased.

In the tank partial pressure method, the second set pressure from pressure source 1 is directly used as the test pressure in the small leak detection process, so the test pressure in the small leak detection process is higher in the case of positive pressure and higher in the case of negative pressure. can be made low, making it suitable when leak testing is required in harsh environments. Moreover, the accuracy of small leakage inspection can be improved.
However, after supplying the standard pressure to the tank 5 and closing it, the second set pressure from the pressure source 1 is supplied to the workpiece capsule 2, and continues to be supplied during the small leakage inspection process, so there is no possibility of defects in the packaging of the workpiece. If this occurs, the amount of air entering the workpiece (in the case of positive pressure) or the amount of air released from the workpiece (in the case of negative pressure) cannot be accurately determined. Therefore, the accuracy of large leakage inspection may be reduced depending on the aspect of the workpiece.

As mentioned above, the tank pressurization method and the tank partial pressure method have advantages and disadvantages, so it is necessary to select a method by taking into consideration the product type and the test pressure required in the event of a small leak. This point will be discussed later.

Other Embodiments FIG. 6 shows an embodiment in which other components are added to the air leak test apparatus of FIG. More specifically, the downstream circuit section 3b of the main circuit 3 is provided with a normally open shutoff valve SV6 downstream of the differential pressure sensor 8. This shutoff valve SV6 remains open when the above-described air leak test is being performed, and is closed when the airtightness of the manifold constituting the circuit is tested.

As shown in FIG. 6, a reference leakage circuit 15 is connected between the upstream circuit section 3a and the downstream circuit section 3b of the main circuit 3. The reference leakage circuit 15 is provided with a reference leakage device 16, and normally closed reference leakage valves SV7 and SV8 are provided on both sides thereof. The reference leak device 16 has a cylindrical body whose both ends are connected to the reference leak circuit 15, and a cylindrical orifice member housed within the body. One end of the orifice member is enlarged in diameter and joined to the inner periphery of the main body, and the other end is reduced in diameter to form an orifice.

The reference leakage valves SV7 and SV8 are kept closed during the above-mentioned normal tank pressurization type and tank partial pressure type air leak tests.
When calibrating the air leak test device, setting a threshold value, etc., a test pressure is applied to the downstream circuit section 3b, a reference pressure is applied to the upstream circuit section 3a, and the first supply valve SV1 and the second supply valve SV2 are , the reference leakage valves SV7 and SV8 are opened with the pressure detection valve SV4 and the release valve SV5 closed. As a result, a reference leak corresponding to a small leak of the workpiece occurs through the orifice of the pseudo leak device 16. Calibration and the like are performed based on the differential pressure detected by the differential pressure sensor 8 at this time.
When the reference leak occurs, the other end of the reference leak device 16 is at the reference pressure controlled by the absolute pressure sensor 6, so a constant reference leakage amount is generated without being affected by changes in the atmospheric pressure of the external environment. be able to.

Automatic selection of test method In this embodiment, the controller 10 is equipped with a touch panel (not shown), and the user automatically selects the test method by inputting information on the product type and desired test pressure into the touch panel. It is now possible to do so.

If the workpiece is a packaged pharmaceutical product, the product type is assumed to be PTP packaging, pillow packaging, vial, etc.
PTP packaging accommodates the tablet between a bonded aluminum sheet and resin sheet, and the test pressure is limited to +10 to +40 kPa.
Pillow packaging is a bag-like packaging and requires an air leak test under negative pressure.
A vial is a small glass or plastic bottle that contains a drug and is sealed with a rubber stopper and metal cap. This vial must be air leak tested at positive pressure.

The automatic selection of the test method executed by the controller 10 will be described in detail below with reference to FIG.
In step 100, the user inputs the product type, and in step 101, inputs a desired test pressure for small leakage inspection, for example, in units of 10 kPa. Note that if the user specifies a pressure exceeding the above range as the test pressure while selecting PTP packaging, correction is prompted. Further, if the user specifies a positive test pressure while inputting pillow packaging, or if a negative test pressure is specified while inputting a vial, correction is similarly prompted.

In the next step 102, it is determined whether the specified test pressure Pt at the time of small leakage inspection is in the range of -40≦Pt≦+40 kPa. When an affirmative determination is made, the process proceeds to step 103 and the tank pressurization method is selected. If the determination is negative, the process proceeds to step 104 and the tank partial pressure method is selected.

If the tank pressurization method is selected in step 103, the process proceeds to step 105, where the pressure in the tank 6 for obtaining the test pressure described above (i.e., the first supply pressure Px from the pressure source 1) is determined in the main air leak test. Determine whether it is possible with the device. If it is determined that this is not possible, the test pressure is changed in step 106 and the determination in step 105 is made again. The test pressure is changed by decreasing it by 10 kPa when the test pressure is positive pressure, and by increasing it by 10 kPa when the test pressure is negative pressure. Note that, prior to step 106, in step 107, it is determined whether the test pressure has reached +10 kPa (in the case of positive pressure) or -10 kPa (in the case of negative pressure). If an affirmative determination is made here, the process proceeds to step 104 and the test method is changed from the tank pressurization method to the tank partial pressure method.

If an affirmative determination is made in step 105, that is, if it is determined that the tank pressurization method can be executed at the specified test pressure or the changed test pressure, the process proceeds to step 108. Similarly, when the tank partial pressure method is selected in step 104, the process also proceeds to step 108. In this step 108, measurement conditions, that is, the time required for each step, the operation timing of valves, etc., the set pressure supplied from the pressure source 1, etc. are set based on the test method and test pressure. Note that measurement conditions corresponding to the test method and test pressure are stored in advance in the memory, and by specifying the test method and test pressure, the measurement conditions can be read from the memory.

In the next step 109, a plurality of non-defective products (for example, three) are prepared as workpieces, and the above-mentioned air leak test process is performed on these non-defective products using the set test method, test pressure, and measurement conditions, and the absolute pressure sensor is 6 and the differential pressure detected by the differential pressure sensor 8 are stored.
In the next step 110, for example, three defective products with defects that may cause large leaks are prepared, and the above-mentioned air leak test process is performed on these defective products using the set test method, test pressure, and measurement conditions. Then, the pressure detected by the absolute pressure sensor 6 and the differential pressure detected by the differential pressure sensor 8 are stored.

In the next step 111, based on the measurement results in steps 109 and 110, a threshold value used in the large leak test and the small leak test is set based on the average value and variation thereof.
Next, in step 112, a non-defective product is set in the work capsule 2 and the above-mentioned reference leakage measurement process is executed, and in step 113, the measurement sensitivity and the like are checked, and this program is ended.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit thereof.
The reference pressure may be approximately the same as atmospheric pressure or may be slightly lower.

INDUSTRIAL APPLICATION This invention is applicable to the air leak test apparatus which inspects defects, such as pharmaceutical packaging.

1 Pressure source 2 Work capsule 3 Main circuit 3a Upstream circuit section 3b Downstream circuit section 4 Branch circuit 5 Tank 6 Absolute pressure sensor (pressure sensor)
7 Pressure detection circuit 8 Differential pressure sensor 8a Work side port 8b Reference side port 10 Controller (control/judgment means)
15 Standard leakage circuit 16 Standard leakage device SV1 First supply valve SV2 Second supply valve SV3 Tank valve SV4 Pressure detection valve SV5 Release valve SV7, SV8 Standard leakage valve W Work

Claims (6)

a) A pressure source capable of supplying atmospheric pressure or pressure including a reference pressure close to atmospheric pressure and a set pressure;
b) A work capsule that accommodates the work to be inspected;
c) a main circuit connecting the pressure source and the work capsule;
d) a first supply valve interposed between the pressure source and the main circuit;
e) a second supply valve provided in the main circuit and dividing the main circuit into an upstream circuit section on the pressure source side and a downstream circuit section on the work capsule side;
F) A tank connected to the upstream circuit section of the main circuit via a branch circuit;
g) a tank valve provided in the branch circuit that connects and disconnects the tank from the main circuit;
h) a pressure sensor connected to the upstream circuit section of the main circuit;
i) A pressure detection circuit whose both ends are connected to the downstream circuit section of the main circuit;
g) A pressure detection valve provided in the pressure detection circuit,
(S) A differential pressure sensor that is provided in the pressure detection circuit and has a work side port that is connected to the work capsule via the downstream circuit section of the main circuit, and a reference side port that is connected to the pressure detection valve;
c) An atmosphere release valve connected to the above main circuit,
B) Control of the supply pressure of the pressure source, sequence control of the first supply valve, the second supply valve, the tank valve, the pressure detection valve, and the atmosphere release valve, and the control of the supply pressure based on the detected pressure from the pressure sensor. a control/judgment means for determining whether there is a large leak in the work and determining whether there is a small leak in the work based on the differential pressure detected by the differential pressure sensor;
Equipped with
The above pressure sensor is an absolute pressure sensor,
The control/judgment means controls the pressure source based on feedback from the pressure sensor, and supplies the reference pressure and the set pressure to the main circuit in one air leak test;
The control/judgment means opens the tank valve to introduce either the reference pressure or the set pressure into the tank from the main circuit in advance, closes the tank valve, and determines whether or not there is a large leak in the workpiece. The air leak test device is characterized in that when the tank valve is opened, the tank is brought into communication with the main circuit which is in the other pressure state between the reference pressure and the set pressure . a) A pressure source capable of supplying atmospheric pressure or pressure including a reference pressure close to atmospheric pressure and a set pressure;
b) A work capsule that accommodates the work to be inspected;
c) a main circuit connecting the pressure source and the work capsule;
d) a first supply valve interposed between the pressure source and the main circuit;
e) a second supply valve provided in the main circuit and dividing the main circuit into an upstream circuit section on the pressure source side and a downstream circuit section on the work capsule side;
F) A tank connected to the upstream circuit section of the main circuit via a branch circuit;
g) a tank valve provided in the branch circuit that connects and disconnects the tank from the main circuit;
h) a pressure sensor connected to the upstream circuit section of the main circuit;
i) A pressure detection circuit whose both ends are connected to the downstream circuit section of the main circuit;
g) A pressure detection valve provided in the pressure detection circuit,
(S) A differential pressure sensor that is provided in the pressure detection circuit and has a work side port that is connected to the work capsule via the downstream circuit section of the main circuit, and a reference side port that is connected to the pressure detection valve;
c) An atmosphere release valve connected to the above main circuit,
B) Control of the supply pressure of the pressure source, sequence control of the first supply valve, the second supply valve, the tank valve, the pressure detection valve, and the atmosphere release valve, and the control of the supply pressure based on the detected pressure from the pressure sensor. a control/judgment means for determining whether there is a large leak in the work and determining whether there is a small leak in the work based on the differential pressure detected by the differential pressure sensor;
Equipped with
The above pressure sensor is an absolute pressure sensor,
Further, a reference leakage circuit connected between the upstream side circuit section and the downstream side circuit section of the main circuit, two reference leakage valves provided in the reference leakage circuit, and the two reference leakage valves provided in the reference leakage circuit. An air leak test device comprising: a reference leakage device provided between two reference leakage valves and having an orifice. a) A pressure source capable of supplying atmospheric pressure or pressure including a reference pressure close to atmospheric pressure and a set pressure;
b) A work capsule that accommodates the work to be inspected;
c) a main circuit connecting the pressure source and the work capsule;
d) a first supply valve interposed between the pressure source and the main circuit;
e) a second supply valve provided in the main circuit and dividing the main circuit into an upstream circuit section on the pressure source side and a downstream circuit section on the work capsule side;
F) A tank connected to the upstream circuit section of the main circuit via a branch circuit;
g) a tank valve provided in the branch circuit that connects and disconnects the tank from the main circuit;
h) a pressure sensor connected to the upstream circuit section of the main circuit;
i) A pressure detection circuit whose both ends are connected to the downstream circuit section of the main circuit;
g) A pressure detection valve provided in the pressure detection circuit,
(S) A differential pressure sensor that is provided in the pressure detection circuit and has a work side port that is connected to the work capsule via the downstream circuit section of the main circuit, and a reference side port that is connected to the pressure detection valve;
c) An atmosphere release valve connected to the above main circuit,
B) Control of the supply pressure of the pressure source, sequence control of the first supply valve, the second supply valve, the tank valve, the pressure detection valve, and the atmosphere release valve, and the control of the supply pressure based on the detected pressure from the pressure sensor. a control/judgment means for determining whether there is a large leak in the work and determining whether there is a small leak in the work based on the differential pressure detected by the differential pressure sensor;
Equipped with
It is possible to selectively perform the first method air leak test and the second method air leak test,
a. In the first method, the control/judgment means:
opening the first supply valve and the tank valve, closing the second supply valve, and supplying a first set pressure from the pressure source to the tank;
While the tank valve is closed and the pressure inside the tank is maintained at the first set pressure, the first supply valve, the second supply valve, and the pressure detection valve are opened, and the pressure source is connected to the main circuit and the pressure source. a step of supplying the reference pressure to the pressure detection circuit ;
The first supply valve is closed, the second supply valve, the pressure detection valve, and the tank valve are opened, and the tank is communicated with the main circuit and the pressure detection circuit, thereby connecting the main circuit and the pressure detection circuit. a large leak detection step of setting the pressure detection circuit to a test pressure intermediate between the reference pressure and the first set pressure, and determining whether there is a large leak in the workpiece based on the detected pressure from the pressure sensor at this time;
a small leak detection step of closing the pressure detection valve and determining whether there is a small leak in the workpiece based on the differential pressure detected from the differential pressure sensor;
Execute in the above order,
b. In the second method, the control/judgment means:
opening the first supply valve and the tank valve and closing the second supply valve to supply the reference pressure from the pressure source to the tank;
While the tank valve is closed and the inside of the tank is maintained at the reference pressure, the first supply valve, the second supply valve, and the pressure detection valve are opened, and the pressure source is connected to the main circuit and the detection valve. a step of supplying a second set pressure as a test pressure to the pressure circuit;
a small leak detection step of closing the first supply valve and keeping the pressure detection valve closed, and determining whether there is a small leak in the workpiece based on the differential pressure detected from the differential pressure sensor;
a large leak detection step of opening the tank valve and communicating the tank with the main circuit, and determining whether or not there is a large leak in the workpiece based on the detected pressure from the pressure sensor;
in the above order,
An air leak test device featuring : 4. The first set pressure in the first method can be selected between positive pressure and negative pressure, and the second set pressure in the second method can also be selected between positive pressure and negative pressure . Air leak test equipment. When performing a first method air leak test using the first set pressure of negative pressure or when performing a second method air leak test using the second set pressure of negative pressure, the control/determination means is characterized in that after the large leak detection step and the small leak detection step are completed, the main circuit is opened to the atmosphere by opening the release valve with the supply of positive pressure from the pressure source. The air leak test device according to claim 4 . The control/judgment means has an information input section for inputting information including the product type and test pressure of the workpiece, and selects either the first or second method according to the input product type and test pressure. The air leak test device according to any one of claims 3 to 5, characterized in that:

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