JP2020051883A - Leak inspection device and method of pouch bag having outlet - Google Patents

Abstract

To determine the presence/absence of leak of a container to be inspected without using a reference container (container having no hole).SOLUTION: A leak inspection device includes: a compressor 23 for feeding a compression air into a pouch bag 1 having an outlet; a flow meter 21; and a determination device 24. The flow meter is disposed on a gas flow path between the compressor 23 and the pouch bag 1 having the outlet, and measures the flow rate of the compression air fed into the pouch bag 1 having the outlet. The leak determination threshold of the determination device is set in a memory 24a. When the flow rate of the compression air measured by the flow meter 21 after a predetermined time from the start of the charging of the compression air by the compressor 23 is the leak determination threshold or more, the determination device determines that the pouch bag 1 having the outlet causes a leak.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an apparatus and a method for inspecting leakage of a pouch bag with a spout.

  If there is a hole in the pouch bag filled with liquid or the like, the contents leak out from the hole. Before filling with a liquid or the like, the pouch bag is inspected for holes (so-called "leakage inspection").

  2. Description of the Related Art There is known an apparatus that inspects a leak of a test object based on a differential pressure generated when air is supplied to a set of a reference container having no hole and a test object (Patent Document 1). When there is no differential pressure, the DUT is determined to be a normal container without leakage, and when there is a differential pressure, the DUT is determined to be a leaky container.

  In Patent Literature 1, in order to accurately inspect for leaks (existence of holes) of the DUT, it must be ensured that there is no leak (holes) in the reference container. If a hole is formed in the reference container, no pressure difference is generated between the container to be inspected having a leak (hole) and an error occurs in which a leaky container is determined to be a normal container.

JP-A-8-327485

  An object of the present invention is to determine whether or not a pouch bag to be inspected has leaked without using a pouch bag without a hole as a reference container.

  Another object of the present invention is to determine the degree of leakage of a pouch bag to be inspected.

  The leak inspection apparatus according to the present invention is to inspect a pouch bag with a spout for leaks (presence or absence of holes). A leak inspection device according to the present invention is provided with a gas filling mechanism for feeding gas into a pouch with an outlet, a gas filling mechanism provided on a gas flow path between the gas filling mechanism and the pouch with an outlet, and a pouch with an outlet. A flow meter for measuring the flow rate of the gas fed into the gas filling device, and a leak determination threshold value. The gas flow rate measured by the flow meter after a predetermined time has elapsed from the start of gas filling by the gas filling mechanism is equal to or greater than the leak determination threshold value. At a certain time, a determination device is provided for determining that the pouch bag with the spout is leaking.

  The present invention also provides a leak inspection method for a pouch with an outlet. According to the leak inspection method for a pouch bag with a spout according to the present invention, a gas is supplied into a pouch bag with a spout by a gas filling mechanism, and a flow rate provided on a gas flow path between the gas filling mechanism and the pouch bag with a spout. The flow rate of gas sent into the pouch bag with the spout is measured by a meter, and the gas flow rate measured by the flow meter after a predetermined time has elapsed from the start of gas filling by the gas filling mechanism is determined by a leak determination. When the value is equal to or more than the threshold value, it is determined that there is a leak in the pouch with the spout.

  If there is no leak (hole) in the pouch with spout, the supply pressure of the gas sent by the gas filling mechanism and the internal pressure of the pouch with spout reach an equilibrium state. No gas flows between the bags. Conversely, if there is a leak in the pouch with the spout, the supply pressure of the gas fed by the gas filling mechanism and the internal pressure of the pouch with the spout are not stabilized in an equilibrium state, and the pouch with the spout is sent into the pouch with the spout. Gas flow (ie, leakage) is measured by a flow meter.

  According to the present invention, the leak determination threshold value is set in the determination device, and when the gas flow rate measured by the flow meter after the elapse of a predetermined time from the start of gas filling by the gas filling mechanism is equal to or greater than the leak determination threshold value, It is determined that there is a leak in the pouch with spout. With a relatively simple structure, a leaky (perforated) pouch with a spout can be found. Since there is no need to use a reference pouch bag having no leak (hole), accurate leak determination is realized.

  Judgment of leakage based on the gas flow rate measured by the flow meter after the elapse of a predetermined time from the start of gas filling is based on the fact that immediately after gas filling, a large amount of gas is stored in an empty pouch with an empty spout. This is because the rush of water flows. After the timing when the gas is sufficiently fed into the pouch bag with the inlet (the pouch bag with the outlet is completely inflated), the leak determination is performed. This timing is appropriately adjusted according to the supply pressure of the gas supplied from the gas filling mechanism, the capacity of the spout pouch bag to be inspected, and the like.

  Leak determination may be performed using a gas flow rate (that is, a plurality of sample values) measured over a predetermined period (for example, 0.3 seconds) after a predetermined time has elapsed after the start of gas filling.

  In one embodiment, a plurality of leak determination thresholds are set, and the gas flow rate measured by the flow meter after a predetermined time has elapsed from the start of gas filling by the gas filling mechanism is defined as the plurality of leak determination thresholds. By comparison, the degree of leakage of the pouch bag with the spout is determined. For example, when the first and second leak determination thresholds (first <second) are used, a leak (a relatively small hole) that is equal to or more than the first leak determination threshold and less than the second leak determination threshold is used. (A relatively large hole) that is equal to or greater than the leakage determination threshold value can be distinguished, and the degree of leakage can be determined.

  Preferably, the determination device is configured to set a charging mechanism abnormality determination threshold, and determine that the gas flow rate measured by the flow meter immediately after the start of gas charging by the gas charging mechanism is less than the charging mechanism abnormality determination threshold. , For determining an abnormality of the gas filling mechanism or the flow meter. As described above, when filling of an empty pouch with an outlet is not filled with gas, gas is rushed into the pouch with an outlet until the pouch with outlet is inflated. . That is, immediately after the start of gas filling, a relatively large flow rate is measured by the flow meter. If the relatively large flow rate is not measured, there is a high possibility that the gas filling mechanism or the flow meter has an abnormality, and the abnormality on the charging mechanism side can be determined using the above-described charging mechanism abnormality determination threshold. The charging mechanism abnormality determination threshold is set to a value larger than the above-described leak determination threshold.

  Preferably, the leak inspection device sandwiches the pouch with the spout from the front and back (front side and back side) thereof, and when the pouch with the spout is completely inflated by gas sent into the pouch with the spout. And a pinching jig for reducing the capacity of the pouch bag with an outlet. Leak determination of the pouch bag with the spout using the leak determination threshold value can be executed in a short time from the start of gas filling, and the inspection time can be shortened.

  The above-described leak determination threshold value is preferably set based on a gas flow rate measured by a flow meter using a pouch with a perforated spout that is actually perforated. The present invention also provides a leak determination threshold value setting method and a pouch bag (sample) with a perforated spout used for setting the leak determination threshold value. According to the method for setting a leak determination threshold value of a pouch bag with a spout according to the present invention, a part of the surface of the pouch bag of the pouch bag with a spout is cut out, the hole has a size exceeding the cutout range, and the hole is laser-processed. Prepare a pouch bag with a perforated spout attached to the pouch bag surface around the cut area around the cut metal plate, and send gas into the perforated pouch bag with a perforated spout by a gas filling mechanism. The flow rate of gas sent into the pouch with perforated outlet is measured by a flow meter provided on the gas flow path between the mechanism and the pouch with perforated outlet, and the gas measured by the flow meter is measured. The flow rate is used to set a leak determination threshold value for determining that there is a leak in the pouch with a spout to be inspected. In the pouch bag with a perforated spout according to the present invention, a part of the surface of the pouch bag is cut out, and the metal plate having a size exceeding the above-mentioned cut-out area and having a laser-processed hole is formed by the cutting method. It is affixed to the pouch bag surface around the area. It is possible to form a hole with an accurate size and a stable shape (dimension) compared to the case where a hole is made directly on the pouch bag surface. You can set a value.

It is a partially broken perspective view of a gusset type pouch bag. It is a perspective view of the gusset-type pouch bag filled with the content. It is a perspective view of a clamping jig. It is a side view of the pinching jig which pinches a gusset type pouch bag. It is a block diagram showing roughly a leak inspection device. It is a flow chart which shows a flow of processing of a leak inspection device. It is a graph which shows the flow rate change at the time of sending compressed air to a gusset type pouch bag without leakage. It is a graph which shows the flow rate change at the time of sending compressed air to a leaking gusset type pouch bag. It is a perspective view of a perforated pouch bag.

  FIG. 1 is a partially broken perspective view of a gusset-type pouch bag 1 before contents are filled. FIG. 2 is a perspective view of the gusset-type pouch bag 1 after the contents are filled.

  The gusset-type pouch bag 1 includes a pouch bag body 2 and a spout 3 attached to the upper center of the pouch bag body 2.

  The pouch bag main body 2 is composed of a front film 4 and a rear film 6 facing each other, and two side films 5 (one side film 5 is shown in FIG. 2) folded inward on each side. It has four films. On both sides of the pouch bag main body 2, the peripheral edge of the side film 5, which is doubled by being folded inward, and the peripheral edges of the front and rear films 4, 6 are thermally welded. In the upper and lower portions of the pouch bag main body 2, the upper and lower peripheral portions of the front film 4 and the rear film 6 are thermally welded. For the front, side, and rear films 4, 5, and 6, use a flexible laminated film containing a material suitable for the characteristics of the contents, such as PET (polyethylene terephthalate), aluminum foil, and LDPE (low-density polyethylene). Can be The shape of the pouch bag body may be a stand-type pouch bag having an independent laminated film also at the bottom, or a flat pouch bag in which four sides of the front film 4 and the rear film 6 are heat-sealed.

  The spout 3 is formed in a cylindrical shape by injection molding, and is inserted into the pouch bag main body 2 below the head with its head protruding above the pouch bag main body 2. In the range where the spout 3 at the upper center of the pouch bag main body 2 is inserted, the front and rear films 4 and 6 are thermally welded to the peripheral surface of the spout 3 without gaps.

  The front film 4, the rear film 6, and the two side films 5 form an internal space opened at the tip of the spout 3 in the pouch bag main body 2. The spout 3 is used when filling the inside of the pouch bag body 2 (internal space) and when pouring out the contents from the pouch bag body 2.

  When the contents are filled into the pouch bag main body 2 through the spout 3, the folding of the side film 5 is gradually eliminated, the front film 4 and the rear film 6 gradually separate, and the volume in the pouch bag main body 2 increases. To go. Hereinafter, the distance between the front film 4 and the rear film 6 (the width of the side film 5) when the contents are almost completely filled in the pouch bag main body 2 (the pouch bag main body 2 is completely expanded) is referred to as “pouch bag”. Width W1 ". By attaching the cap 7 to the head of the spout 3 and closing the opening of the spout 3, the pouch bag 1 filled with the contents shown in FIG. 2 is completed.

  FIG. 3 is a perspective view of a sandwiching jig 10 used for leak inspection of the gusset type pouch bag 1. FIG. 4 is an enlarged side view of the sandwiching jig 10 in a state where the pouch bag main body 2 of the gusset type pouch bag 1 is sandwiched.

  As described later, in the leak test of the gusset-type pouch bag 1, the flow rate of the compressed air sent into the pouch bag main body 2 is used. The compressed air is sent until the pouch bag main body 2 is completely inflated. For this reason, if the capacity of the pouch bag main body 2 is large, it takes time until the pouch bag main body 2 is completely inflated.

  A pinching jig 10 is used to reduce the amount of compressed air sent into the pouch bag body 2 at the time of leak inspection and to shorten the inspection time. The sandwiching jig 10 includes a pair of sandwiching plates 11 and 12 provided in parallel with each other with a gap of a predetermined interval W2 of, for example, about 2 to 4 mm, and a gusset-type pouch to be inspected is provided in the gap between the sandwiching plates 11 and 12. The pouch bag body 2 of the bag 1 is sandwiched from front and rear. The interval W2 of the gap between the sandwiching plates 11, 12 is smaller than the above-described pouch bag width W1 (see FIG. 2) (W1> W2). The pouch bag main body 2 sandwiched between the sandwiching plates 11 and 12 cannot be expanded up to the pouch bag width W1, but becomes fully expanded at a width W2 smaller than that. That is, by using the pinching jig 10, the capacity of the pouch bag main body 2 when the pouch bag main body 2 is completely expanded can be reduced, and when the compressed air is sent into the pouch bag main body 2, Can be shortened until the bulges completely. In order to be able to inspect a plurality of gusset-type pouch bags 1 at a time, a plurality of sandwiching jigs 10 are generally provided in the leak inspection apparatus as shown in FIG.

  FIG. 5 is a block diagram showing a schematic configuration of the leak inspection device.

  The leak inspection device includes the above-described sandwiching jig 10, a flow meter 21 for measuring a flow rate of compressed air sent into the pouch bag main body 2, a compressor 23 for generating compressed air, and a flow rate of compressed air measured by the flow meter 21. (Measured value thereof) is provided, and a determination device 24 for determining whether or not the gusset type pouch bag 1 has leaked is provided. A plurality of sandwiching jigs 10 and flow meters 21 are provided corresponding to a plurality of gusset-type pouch bags 1 to be inspected at a time. One compressor 23 and one determination device 24 are provided. Of course, it is also possible to provide one compressor 23 and one judging device 24 for each gusset-type pouch bag 1 to be inspected.

  The flow meter 21 is connected by a pipe to a compressor 23 and a connector 22 connected to the spout 3 of the pouch bag 1. The compressed air generated by the compressor 23 is sent into the pouch bag main body 2 through the connector 22 and the outlet 3 through the flow meter 21. As the flow meter 21, a volume flow meter, a Coriolis flow meter, a vortex flow meter, a differential pressure flow meter, a thermal flow meter, or another flow meter can be used.

  The flow rate of the compressed air measured by the flow meter 21 is given to the determination device 24 through a signal line. The determination device 24 is a computer device including a CPU, a memory (including a hard disk or the like) 24a, a communication device, and the like. A program for executing a leak determination process described later, a threshold value, and the like are stored in the memory 24a.

  FIG. 6 is a flowchart showing the processing of the leak inspection device including the determination process (steps 43 to 48) by the determination device 24. 7 and 8 are graphs in which the horizontal axis represents elapsed time (unit: ms), and the vertical axis represents the flow rate (unit: ml / min) of the compressed air flowing into the pouch bag main body 2. FIG. 7 shows a flow rate change graph 25 of a normal product (a gusset-type pouch bag 1 with no leak), and FIG. 8 shows a defective product (a gusset-type pouch bag with a leak 1, specifically a pinhole having a diameter of 50 μm). The flow rate change graphs 26 of the gusseted pouch bags 1) are shown respectively.

  In the graphs of FIGS. 7 and 8, two threshold values TH1 (about 4000 ml / min) and TH2 (about 500 ml / min) are indicated by broken lines. As will be described in detail below, the threshold value TH1 is used to determine the abnormality of the filling mechanism that sends compressed air into the pouch bag body 2, and the threshold value TH2 is used to determine whether the gusset type pouch bag 1 is defective (leakage of the pouch bag body 2). These values are used to judge the values, and are all set (stored) in advance in the memory 24a of the judgment device 24. Hereinafter, in order to easily distinguish the two thresholds TH1 and TH2, the threshold TH1 is referred to as a “filling mechanism abnormality determination threshold TH1”, and the threshold TH2 is referred to as a “pouch bag failure determination threshold TH2”.

  Referring to FIG. 6, first, gusset-type pouch bag 1 to be inspected is inserted into the gap of sandwiching jig 10. As described above, the pouch bag main body 2 is sandwiched between the pair of sandwiching plates 11 and 12 from the front and rear thereof (step 41) (see FIG. 4).

  The connector 22 is connected to the spout 3 of the gusset-type pouch bag 1, and the filling of the compressed air from the compressor 23 into the pouch bag body 2 is started (step 42).

  The compressed air sent into the pouch bag main body 2 passes through the flow meter 21 provided between the compressor 23 and the gusset type pouch bag 1 as described above (FIG. 5). Data representing the flow rate of the compressed air measured by the flow meter 21 is provided to the determination device 24.

  Referring to the graphs in FIGS. 7 and 8, time t1 is the time when the filling of the compressed air is started. At a flow rate of about 9000 ml / min, compressed air is rushed into the pouch bag body 2.

  At the time t2, the flow rate of the compressed air is reduced at once. This is because at time t2, the pouch bag main body 2 has completely swelled, and the supply pressure of the compressed air from the compressor 23 and the internal pressure of the pouch bag main body 2 have become substantially equilibrium (substantially the same). By using the sandwiching jig 10 described above, the time from time t1 to time t2 can be significantly reduced. The time required from time t1 to time t2 can be, for example, on the order of about 0.1 second.

  Returning to FIG. 6, the determination device 24 first determines whether there is a flow rate equal to or higher than the charging mechanism abnormality determination threshold TH1 (immediately after the start of the compressed air charging) (step 43). The filling mechanism abnormality determination threshold value TH1 is a connection connected to the filling mechanism side of the compressed air, specifically, the compressor 23 for supplying the compressed air, the pipe through which the compressed air flows, and the spout 3 of the gusset-type pouch bag 1. The flow rate value that will surely exceed if the tool 22 (and its connection) and the flow meter 21 through which the compressed air passes are normal, for example, the flow rate that flows into the pouch bag body 2 when the filling mechanism is normal (About 4000 ml / min) is set.

  If the flow value from the filling start time t1 to the time t2 when the equilibrium state is reached if normal is maintained at a flow rate less than the charging mechanism abnormality determination threshold TH1, an abnormality in the compressor 23, an abnormality in the piping, an abnormality in the connector 22, It is conceivable that an abnormality or the like of the flow meter 21 occurs. In this case, the determination device 24 determines whether the charging mechanism is abnormal (NO in step 43, step 44). The operator is notified of the abnormality of the filling mechanism by generating a warning sound, lighting a warning lamp, or the like.

  When the filling mechanism is operating normally (YES in step 43), m seconds to n seconds (time t3 to time t4) (m <n) after the start of filling (hereinafter referred to as a determination period T, FIGS. 7 and 8) It is determined whether or not a flow rate equal to or more than the pouch bag failure determination threshold value TH2 has been measured during the determination period T using the flow rate measurement values up to (see Steps 45 and 46). The start timing of the determination period T (time t3) is a timing after the pouch bag main body 2 has fully swelled. For example, the start timing (time t3) of the determination period T is set 0.65 seconds after the filling start time t1. The end timing (time t4) of the determination period can be set arbitrarily, and is set, for example, 0.9 seconds after the filling start time t1.

  7 and FIG. 8 are compared. Referring to the graph 25 of FIG. 7, in this graph 25, the flow rate in the determination period T from time t3 to time t4 is less than the pouch bag failure determination threshold TH2 (almost no compressed air flows). In this case, the determination device 24 determines that the gusseted pouch bag 1 is a normal product (NO in step 46, step 48). On the other hand, referring to the graph 26 of FIG. 8, in this graph 26, the flow rate of the compressed air exceeding the pouch bag failure determination threshold TH2 is measured in the entire determination period T from time t3 to time t4. When there is a hole (pinhole) in the pouch bag main body 2, the compressed air cannot be kept stationary, and the compressed air slightly flows into the flowmeter 21, which is measured by the flowmeter 21. is there. When the flow rate exceeding the pouch bag failure determination threshold value TH2 is measured in the determination period T, the determination device 24 determines that the gusset type pouch bag 1 is defective (YES in step 46, step 47).

  The gusset-type pouch bag 1 determined to be defective is excluded from the content filling step, and only the gusset-type pouch bag 1 determined to be normal proceeds to the content filling step. The filling of the contents into the gusset-type pouch bag 1 having a leak (hole) is prevented.

  The pouch bag failure determination threshold value TH2 used to determine whether the gusset type pouch bag 1 is normal (has no holes) or defective (has holes) is a pouch bag with holes (a pouch with holes). (A bag: sample), and is determined by the operator based on a flow rate change graph (graph 26 in FIG. 8) measured for the perforated pouch bag.

  FIG. 9 shows a perforated pouch bag (sample) used to determine the pouch bag defect determination threshold value TH2.

  The perforated pouch bag 1A cuts a part of the front film 4 (or the rear film 6 or the side film 5) into a predetermined size, for example, a square of 5 mm (a cutting range is indicated by reference numeral 31), and uses a laser. A stainless steel plate 32 larger than the above-mentioned cut-out area 31 in which a hole 33 having a size of 3 mm is machined is attached to the front film 4 around the cut-out area 31 so as to cover the entire cut-out area 31. Preferably, a stainless steel plate having a thickness equivalent to that of the front film 4 is used. The stainless steel plate 32 is firmly adhered to the front film 4 from outside using a tape or the like having high adhesion as much as possible so as not to cover the hole 33 formed in the stainless steel plate 32 with the tape. Compared to drilling directly into the front film 4 using a micro drill or the like, it is possible to drill a hole 33 with an accurate diameter, and to prevent the hole 33 from expanding or closing. can do.

  The flow rate change graph 26 as shown in FIG. 8 can be obtained by performing the above-described leak inspection on the perforated pouch bag 1A as an inspection target. By using the acquired flow rate change graph 26, the pouch bag defect determination threshold value TH2 can be accurately set.

  By drilling a hole in the stainless steel plate 32 using a laser, a hole 33 having an accurate dimension can be formed. A perforated pouch bag 1A having a hole 33 of an arbitrary diameter such as 50 μm, 100 μm, 150 μm, or 200 μm can be created, and a pouch bag defect determination threshold value TH2 can be set for each of them. By setting the pouch bag defect determination threshold value TH2 in a plurality of stages, it is possible to determine not only the presence / absence of leakage (presence or absence of holes) but also the degree of leakage (size of holes) present in the gusset-type pouch bag 1 to be inspected. be able to. For example, a first pouch bag failure determination threshold determined using a flow rate change graph 26 measured using a perforated pouch bag 1A having a hole of 50 μm, and a perforated pouch bag 1A having a hole of 100 μm. By using the second pouch bag failure determination threshold (first pouch bag failure determination threshold <second pouch bag failure determination threshold) determined using the flow rate change graph 26 measured using the first pouch bag failure determination threshold, Leakage (relatively small holes) that is greater than or equal to the leakage determination threshold and less than the second leakage determination threshold can be distinguished from leakage (relatively large holes) that is greater than or equal to the second leakage determination threshold. In addition, the inspection can be performed to the degree of leakage.

1 Gusset type pouch bag 1A Perforated pouch bag 2 Pouch bag body 3 Spout
10 Insertion jig
11, 12 sandwiching plate
21 Flow meter
23 Compressor
24 Judging device
24a memory

Claims (7)

A gas filling mechanism that sends gas into a pouch bag with a spout,
A flow meter provided on a gas flow path between the gas filling mechanism and the pouch with a spout to measure a flow rate of the gas fed into the pouch with the spout; When a gas flow rate measured by the flow meter is equal to or greater than the leak determination threshold after a predetermined time has elapsed from the start of gas filling by the filling mechanism, a determination device is provided for determining that the pouch bag with the spout has a leak when the gas flow rate is equal to or greater than the leak determination threshold value. Yes,
Leak inspection device for pouch bags with spouts. The above determination device is
Multiple leak judgment thresholds are set,
A method for determining the degree of leakage of the pouch bag with a spout by comparing a gas flow rate measured by the flow meter with the plurality of leak determination thresholds after a predetermined time has elapsed from the start of gas filling by the gas filling mechanism. Is,
The leak inspection device for a pouch bag with a spout according to claim 1. The above determination device is
The filling mechanism abnormality judgment threshold is set,
Immediately after the gas filling mechanism starts gas filling, when the gas flow rate measured by the flow meter is less than the filling mechanism abnormality determination threshold, the gas filling mechanism or the flow meter is determined to be abnormal. ,
The leak inspection device for a pouch bag with a spout according to claim 1 or 2. A sandwiching jig for sandwiching the pouch with a spout from the front and rear thereof and reducing the capacity of the pouch with a spout when the pouch with the spout is completely inflated by gas sent into the pouch with the spout. Have,
The leak inspection device for a pouch with a spout according to any one of claims 1 to 3. The gas is fed into the pouch with outlet by the gas filling mechanism,
A flow meter provided on a gas flow path between the gas filling mechanism and the pouch with a spout measures a flow rate of gas sent into the pouch with the spout,
When the gas flow rate measured by the flow meter after a lapse of a predetermined time from the start of gas filling by the gas filling mechanism is equal to or greater than a set leak determination threshold value, it is determined that the pouch with outlet is leaking. ,
Inspection method for pouch bags with spouts. A part of the pouch bag surface of the pouch bag with a spout is cut out, and a metal plate having a size exceeding the above cutout region and having a hole processed by laser is placed on the pouch bag surface around the cutout region. Prepare a pouch with a perforated spout attached.
The gas is fed into the pouch with perforated spout by the gas filling mechanism.
A flow meter provided on a gas flow path between the gas filling mechanism and the pouch with a perforated outlet is used to measure a flow rate of gas sent into the pouch with a perforated outlet.
Using the gas flow rate measured by the flow meter, set a leak determination threshold value for determining that there is a leak in the pouch bag with a spout to be inspected,
How to set the leak judgment threshold value for pouch bags with spouts. A part of the pouch bag surface of the pouch bag with a spout is cut out,
A metal plate having a size exceeding the cutout area and having a hole processed by laser is attached to the pouch bag surface around the cutout area,
Pouch bag with perforated spout.

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