JP3138826B2 - Leak inspection method and apparatus for hermetic synthetic resin container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting leakage of a hermetically sealed synthetic resin container which is filled with cooked contents, sealed with a sheet lid, and subjected to a retort treatment as a high-temperature sterilization treatment. The present invention relates to an inspection apparatus that performs this inspection method.

[0002]

2. Description of the Related Art A conventional leak detecting means for a closed container is shown in FIG.
As shown in FIG. 11, only the top wall 19 portion of the container 18 is positioned in the negative pressure atmosphere by the pressing piece 21 that makes the lower surface closely contact the upper end edge of the cylindrical wall portion of the metal can container 18, and only the top wall 19 is The amount of bulging deformation of the ceiling wall 19 due to the negative pressure acting thereon is reduced by displacing the measurement piece 20 attached to the holding piece 21 until the lower end of the measurement piece 20 contacts the upper surface of the ceiling wall 19. By
Detecting by measuring the height from the lower end of the can 18 to the center of the top wall 19, and comparing the measured value with a predetermined reference value for inspection, as shown in FIG. 12,
By exhausting the air in the vacuum tank 22 through an air inlet 23 in the vacuum tank 22 and the can 18 as a whole, the can 18 is positioned in a constant negative pressure atmosphere, and the vacuum tank 22 after a certain time has passed. Inspections are performed based on changes in internal pressure.

[0003] The inspection means shown in FIG. 11 shows that a leaking can container 18 has a large swelling of the top wall 19 due to the action of negative pressure on the top wall 19, and the degree and degree of swelling of the top wall 19. The inspection means shown in FIG. 12 can detect the presence or absence of a leak, and when the leak occurs in the can 18, the air in the can 18 leaks into the vacuum tank 22, The pressure value maintained at a constant negative pressure value in the vacuum tank 22 increases and decreases due to the air leaking from the container 18, and the presence or absence of a leak can be detected based on the increase in the pressure value.

[0004]

However, the above-mentioned prior art is used to fill a sealed synthetic resin container, particularly a synthetic resin container molded into a bottomed cylindrical shape, with the content cooked, and then cover the sheet. There is a problem that it is impossible to inspect the leak of a hermetically sealed synthetic resin container.

[0004] That is, basically, in a closed synthetic resin container, the rigidity of the container itself is lower than that of a metal can container, so that the degree of pressure change that can be applied to the container can be increased. Therefore, the amount of change that can be detected is small, and regardless of the presence or absence of leakage, the amount of deformation of the container wall portion according to the pressure change is large, and it is difficult to determine the presence or absence of leakage based on the amount of deformation. It depends on the reasons.

For example, in the inspection means shown in FIG. 11, the top wall of the container, specifically, the lid made of sheet is greatly swelled and deformed by the action of the negative pressure regardless of the presence or absence of the leak. By measuring the distance from the lower end to the ceiling wall, it is not possible to obtain the difference between the case with the leak and the case without the leak.

Further, in the inspection means shown in FIG.
Placing the entire low-rigidity hermetic synthetic resin container in a negative pressure atmosphere causes a particularly low-rigidity portion, specifically, the bottom wall and the sheet lid to bulge and deform, thereby depressurizing the inside of the container. State, even if the container has a leak, the air inside is difficult to leak out, and the constant negative pressure value in the vacuum tank 22 changes due to the large bulging deformation of the container itself. Even if there is a leak, the pressure change due to the leak cannot be distinguished from the pressure change due to the bulging deformation of the container itself, so that the leak cannot be inspected.

Accordingly, the present invention has been made to solve the above-mentioned problems in the prior art, and causes a difference in internal pressure between a leaky container and a non-leakable container, and the internal pressure is reduced by the action of the internal pressure. The technical task is to measure the displacement of the sheet lid that produces the largest displacement, and to accurately and accurately check for leaks in the synthetic resin container sealed with the low rigid sheet lid. The purpose is to inspect.

[0008]

Means for solving the above-mentioned technical problem is to fill a sheet-shaped lid made of synthetic resin into a synthetic resin container molded into a bottomed cylinder, and then to cover the sheet. Closed with the body, and then a leak inspection method for a closed synthetic resin container to be retorted, for the container,
A step of performing a retort treatment under heating and pressurizing conditions, a step of cooling, a step of pressurizing in a high-pressure atmosphere, and then returning to an atmospheric pressure atmosphere, and forming a sheet based on an upper edge of a cylindrical wall portion of the container. The step of measuring the height position of the lid is performed in order, and the presence or absence of leakage of the container is determined based on the measured value of the height position of the sheet lid.

The retort treatment under heating and pressurizing conditions is as follows:
It is preferable to use a high-temperature hot liquid and to perform cooling after the retort treatment with a cooling liquid.

[0010] In order to continuously perform a leak test on a large number of containers, a large number of containers returned to the atmospheric pressure atmosphere are conveyed on a conveyer in an aligned state. It is preferable to perform a step of measuring the height position.

Means constituting an inspection apparatus for carrying out the above-described inspection method include filling and storing the cooked contents in a synthetic resin container formed into a bottomed cylindrical shape, and then sealing the container with a sheet lid. the sealed plastic containers, heated, with retorted under conditions of pressure, after the retort treatment, cooling, atmospheric pressure from the pressure within the high pressure atmosphere
Having a retort processing tank returned to the inside, having a transport conveyor that transports a large number of the containers taken out from the retort processing tank into the atmospheric pressure atmosphere in an aligned state, to the containers being transported by this transport conveyor In contrast, there is provided a measuring device which is displaced downward from above and measures the height position of the lid made of sheet with reference to the upper edge of the cylindrical wall portion of the container.

When the sheet body, which is the main body of the sheet lid, is made of a laminated sheet of aluminum foil, the measuring device is provided with an electromagnetic induction effect on a support base that abuts the lower surface on the upper edge of the cylindrical wall of the container. It is preferable to use a configuration in which the eddy current type displacement sensor used is opposed to the sheet body of the sheet lid from above and is fixed at a fixed height position with respect to the lower surface of the support base.

[0013] In order to discharge a defective container to the outside of the conveying path according to the measurement value of the measuring device, downstream of the measuring position of the measuring device on the conveying path formed by the conveying conveyor, sorting into the conveying path from outside the conveying path. It is good to have a machine.

In order to accurately perform the measuring operation of the measuring device with respect to the container, a stop piece for stopping the container conveyed by the transport conveyor immediately below the measuring device is provided below the measuring device, and the transport conveyor is formed. It is preferable to provide a standby piece for stopping the container being transported in synchronization with the stop piece on the upstream side of the measurement position by the measuring device along the transport path.

[0015]

[Function] A container containing the contents of the cooked contents,
When the retort treatment is performed under heating and pressurized conditions, the container is under pressurized conditions.
The wall portion of the container, particularly the sheet body which is the main part of the sheet member having the lowest rigidity, does not swell significantly, and the mechanically weakest sheet member does not break during retort processing.

When the retort-treated container is cooled, the container is closed under the conditions for sealing with the sheet lid, that is, after the cooked contents are stored in the container, and immediately sealed with the sheet lid. The condition is negative pressure.

When a container which has been cooled and has a negative pressure inside is placed in a high-pressure atmosphere and pressurized, a large pressure difference is generated between the inside of the container and the atmosphere. Maintains the negative pressure around it,
In a defective container having a leak, air enters the container due to a pressure difference between the atmosphere and the inside of the container , the negative pressure inside the container is reduced, and the pressure inside the container increases.

When the container is returned from the high-pressure atmosphere to the atmospheric pressure atmosphere, a good leak-free container maintains a negative pressure inside the container, so that the internal pressure of the container is lower than the atmospheric pressure. For this reason, the sheet body of the sheet rigid body having the lowest rigidity has a posture in which the sheet body is curved and depressed inward. On the other hand, the negative container having a leak has a reduced negative pressure inside, so that the atmospheric pressure is reduced. In contrast, the inner pressure of the container is almost the same or higher than the atmospheric pressure, so that the sheet member of the sheet member having the least rigidity is almost flat or bulged outward without being deformed inwardly. Posture.

The sheet lid is attached to the opening at the upper end of the container, and the deformation displacement of the sheet lid due to the difference between the internal pressure of the container and the atmospheric pressure occurs along the height direction of the container. Even if the container itself is deformed due to the difference between the internal pressure of the container and the atmospheric pressure, the positional relationship between the upper edge of the cylindrical wall of the container and the peripheral edge of the sheet body of the sheet lid is Since it is invariable, by measuring the displacement amount along the height direction of the sheet lid with reference to the upper edge of the cylindrical wall portion of the container, the measurement of the displacement amount of the sheet lid becomes accurate. .

Further, since the upper edge of the cylindrical wall portion of the container is the portion of the container closest to the sheet lid that is hardly deformed, the amount of deformation of the sheet lid based on the upper edge of the cylindrical wall portion of the container is determined. By performing the measurement, the amount of deformation generated in the sheet lid is directly measured as a large change value .

When the height of the sheet lid is measured with reference to the upper edge of the cylindrical wall of the container and the measured value is within a preset range, the container is determined to be non-defective. If the measured value is out of the set range, it is determined that the container has a leak and is defective.

Next, a leak test of a container by a leak test apparatus according to the present invention, which includes a retort processing tank, a transport conveyor, and a measuring device, will be described in order.

In a state in which the container in which the contents of the cooked contents are hermetically sealed is stored in the retort processing tank, the retort processing tank is filled with a high-temperature liquid, and the inside of the retort processing tank is pressurized to heat the container. And retorting under pressure.

In the retort treatment of the container under the conditions of heating and pressurizing, a hot liquid previously heated to a high temperature may be poured into the retort treatment tank, and then the inside of the retort treatment tank may be pressurized. If it is desired to retort the container at a higher temperature, it is better to heat the hot liquid more rapidly under pressure.

After the retort treatment is completed, the inside of the retort treatment tank is returned to the atmospheric pressure, and the hot liquid in the retort treatment tank is replaced with a cooling liquid to cool the container after the completion of the retort treatment.

When the cooling of the container with the cooling liquid is completed, the cooling liquid is discharged from the retort processing tank, and then the atmosphere is pressurized into the retort processing tank to pressurize the container.

In the retort tank, when the cooled container is placed in a high-pressure atmosphere and pressurization is completed, the container is taken out of the retort tank and returned to the atmosphere.
It is lined up on a transport conveyor as it is, loaded and transported to just below the measuring instrument.

When the container conveyed by the conveyor is located immediately below the measuring instrument, the measuring instrument is lowered to bring its lower end surface into contact with the upper edge of the cylindrical wall portion of the container. The displacement of the sheet lid with respect to the upper edge of the cylindrical wall portion of the container is measured with a measuring device in a state of contact with the upper edge of the cylindrical wall portion.

When measuring the displacement of the sheet-made lid with this measuring device, the measuring reference position is the upper end edge of the cylindrical wall portion of the container. The measuring device can be accurately positioned in a posture for measuring the displacement of the sheet-made lid simply by making contact with the upper end edge of the cylindrical wall of the container.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a container 2 of a container 1 to be inspected according to the present invention. The contents cooked at 70 ° C. to 85 ° C. in a container 2 made of a synthetic resin molded into a bottomed cylindrical shape. 4
The container 2 is a thin-walled container made of a polypropylene resin, and is formed by a suitable forming means such as pressure forming, vacuum forming, blow molding, and injection molding.

FIG. 2 shows a sheet lid mainly composed of a sheet in which an opening of the container 2 accommodating the contents 4 shown in FIG. 3 is tightly welded and fixed by welding sealing means such as high-frequency induction heating and the like, and shows a hermetically sealed synthetic resin container 1 in which the contents 4 are hermetically stored. The sheet lid 3 is welded and fixed to the container 2. Initially, the internal pressure of the container 1 increases due to the fact that the contents 4 are still at a high temperature and the head space is formed on the contents 4 in the container 1, and as shown in FIG. Swelling and deformation may occur in the bottom wall and the sheet body of the sheet lid.

FIG. 3 shows the retort treatment of the container 1 in the retort treatment tank 5, wherein the hot liquid 16 injected into the retort treatment tank 5 is heated to 120.degree. The container 1 is placed in the hot liquid 16 at a temperature of 120 ° C. in the pressurized state.
Is sterilized for about 30 minutes.

At the time of the retort treatment in the retort treatment tank 5, the container 1 is heated together with the contents 4 and the internal pressure increases. However, since the pressure in the retort treatment tank 5 is higher, The container 1 is pushed by the pressure in the retort treatment tank 5 and each part is slightly depressed and deformed.

FIG. 4 shows a cooling process in which the container 1 is cooled by replacing the hot liquid 16 in the retort processing tank 5 with the cooling liquid 17 after the retort processing is completed. The contents 4 are gradually cooled to about 50 ° C.

When the slow cooling is completed, a negative pressure is generated in the container 1 due to condensation of water vapor, and the container 1 is slightly depressed and deformed as shown in the figure due to the negative pressure.

FIG. 5 shows a pressurization process in which after the cooling process is completed, the cooling liquid 17 in the retort treatment tank 5 is discharged, and then a pressurized atmosphere is injected into the retort treatment tank 5 to pressurize the container 1. The pressure treatment for the container 1 is 4 to 5 kg /
Perform at a pressure of about cm ² for 30 to 120 seconds. Pressing degree 4-5
The reason why the pressure is set to Kg / cm ² is to prevent the sheet portion of the sheet lid 3 from being broken by the action of pressure.

Prior to pressurizing the container 1 in a high-pressure atmosphere, the cooling liquid 17 adhering to the surface of the container 1 on the sheet lid 3 or the like is removed by means such as rotating the container 1 at high speed. It is better to remove it. This is because the liquid adhering to the surface of the container 1 may block the fine leak holes generated in the container 1 and prevent the pressurized air from entering the container 1 through the leak holes. .

FIG. 6 shows a state in which the pressurized air in the retort processing tank 5 is exhausted after the completion of the pressure processing, and the inside of the retort processing tank 5 is returned to the atmospheric pressure. Is returned to the atmospheric pressure, and then the container 1 is taken out of the retort processing tank 5 and is aligned and mounted on the conveyor 6 to be measured.
To the side.

By returning the container 1 to the atmospheric pressure atmosphere, as shown in FIG.
Since there is no intrusion of air into the container 1 due to the pressurizing process, the inside of the container 1 remains in a negative pressure state, so that the sheet portion of the sheet lid 3 is bent inward and depressed. On the contrary, in the defective container 1 having a leak, since air enters the container 1 due to the pressurizing process, the inside thereof has a pressure as high as the pressure in the pressurizing process. The sheet portion of the lid 3 is curved outward and swells.

FIG. 7 shows an operation of determining whether the container 1 is good or defective using the measuring instrument 7. The eddy current type displacement sensor 8 utilizing electromagnetic induction is fixed to the support base 9 immovably. The configured measuring device 7 was lowered with respect to the container 1 stopped on the transport conveyor 6 immediately below, and the lower end surface of the support base 9 was brought into contact with the upper edge of the cylindrical wall portion of the container 1. At the position, the height position of the sheet portion of the sheet lid 3 by the displacement sensor 8 is measured without contact.

FIG. 8 shows an example of judging the quality of the container 1 based on the result of measurement by the measuring device 7 shown in FIG. 7. Each numerical value in the table shown in FIG. The distance to the sheet portion of the lid 3 is measured, and the measured value is obtained by subtracting the measured value from 10.08 which is the maximum value measured by the displacement sensor 8. That is, in the case of the normal container 1 having no leak, since the sheet portion of the sheet lid 3 is in a depressed state, the distance from the lower end surface of the displacement sensor 8 to the sheet portion of the sheet lid 3 is large. Therefore, the subtraction value becomes small and is determined to be non-defective. Conversely, in the case of a defective container 1 having a leak, the sheet portion of the sheet lid 3 is in a swelling state, The distance from the end face to the sheet portion of the sheet-made lid 3 is small, and therefore the subtraction value becomes large, and the product is determined to be defective.

In FIG. 8, the range of 1.99 to 2.21 mm is provided as a non-defective judgment range because a sheet lid formed by stretching an aluminum foil sheet on a synthetic resin frame. The variation in the degree of stretching of the sheet portion in the body 3, the difference in the degree of thermal shrinkage deformation of the synthetic resin frame of the sheet lid 3 and the container 2 caused by the heat treatment of the container 1, and the difference in the degree of heat shrinkage formed in the closed container 1. This is caused by variations in head space, etc., and the judgment range of this non-defective product depends on the dimensions of the container 2,
It is necessary to separately set according to the physical properties of the contents 4 to be stored, the temperature value of the heat treatment, and the like. By the way, in the case of the embodiment shown in FIG. 8, the capacity of the container 2 is 220 cc, the content 4 is stored at a specific gravity of 1, 200 cc, and the height and width of the head space in the closed state of the container 1 are about 10 mm. .

FIGS. 9 and 10 show an embodiment of the apparatus of the present invention. After pressurizing a retort treatment tank 5 (not shown), the container 1 returned to the atmospheric pressure and taken out is transferred to a conveyor 6. They are mounted and transported in a state of being arranged in a line. When the container 1 is located immediately below the measuring device 7, the stop piece 13 provided to be able to move forward and backward with respect to the container conveying path moves forward in a state of blocking the conveying path, and stops the container 1 immediately below the measuring device 7. At this time, the standby piece 14 provided on the upstream side so as to be able to advance and retreat with respect to the container transport path also advances synchronously with the transport path being cut off, and stops the transport movement of the container 1 described below.

A guide bar 15 is provided along the transport path near the transport path formed by the transport conveyor 6, and the container 1 stopped on the transport conveyor 6 by the standby piece 14 is
It is prevented from dropping on the conveyor 6 or from being shifted from a set position on the conveyor 6.

When the container 1 is stopped immediately below the measuring device 7, the measuring device 7 mounted via the mounting column 11 is lowered by the operation of the cylinder 10, and the lower end surface of the supporting base 9 is moved to the container 1 Then, the sheet portion of the sheet lid 3 of the container 1 is measured by contacting the upper end edge of the cylindrical wall portion, and immediately after the measurement is completed, the cylinder 10 is operated to return to the ascending position.

When the measuring device 7 is lifted and returned, the stop piece 13
Is retracted and returned, and the container 1 has been measured by the conveyor 6
Is resumed, and at the same time, the standby piece 14 also moves backward and returns, and the transport of the unmeasured container 1 by the transport conveyor 6 is resumed.

The result of the measurement by the measuring device 7 is inputted to a judging unit (not shown) to judge the quality of the driving signal, and the sorting signal is sent to a sorting machine 12 located downstream of the transport path based on the judgment result from the judging unit. Is output. In the sorting machine 12, when the signal from the determination unit is "good", the transport of the container 1 by the transport conveyor 6 is missed without operating, and when the signal from the determination unit is "bad", It operates to shut off the transport path, and discharges the containers 1 transported by the transport conveyor 6 to the side.

[0048]

Since the present invention has the above-described structure, the following effects can be obtained. After the container is pressurized in a high-pressure atmosphere, the container is returned to the atmospheric pressure atmosphere, and the displacement of the sheet portion of the sheet lid is measured with reference to the upper edge of the cylindrical wall of the container. Can reliably and accurately measure the displacement of the sheet portion of the sheet lid body, thereby accurately and reliably inspecting for the presence or absence of leakage of the container, and detecting a slight leak. .

Since the measurement of the displacement of the sheet portion of the sheet lid by the measuring device is achieved with reference to the upper end edge of the cylindrical wall of the container, the measurement can be performed only by moving the measuring device up and down with respect to the container. Therefore, the measurement operation for each container is extremely simple and easy.

When the measuring device is constituted by an eddy current type displacement sensor utilizing an electromagnetic induction action, the measurement can be achieved without contacting the sheet portion of the sheet lid which is the object to be measured.
There is no danger of causing a displacement due to the measuring operation on the sheet part having extremely low rigidity, so that a very accurate measurement can be obtained.

The leak inspection of the container by the measuring device can be performed only by mounting the measuring device on the conveyor so that the measuring device can be moved up and down freely, and displacing the measuring device downward until it comes into contact with the container immediately below. Can be simplified, and its handling is easy.

Since the inspection of the containers is achieved by a simple displacement of the measuring device while the containers being transported by the transport conveyor are temporarily stopped, the leak inspection of many containers can be continuously performed. Therefore, the leak test of the container can be efficiently and promptly achieved, and the productivity of the high-quality container can be improved.

[0053]

[Brief description of the drawings]

1 to 7 show an operation state according to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a state in which a container is filled with cooked contents, and FIG. FIG. 3 is a longitudinal sectional view showing a state in which the container shown in FIG. 2 is being retorted, and the container shown in FIG. 2 is being retorted. FIG. 4 is a retort treatment. FIG. 5 is a longitudinal sectional view showing a state where the container is cooled later, FIG. 5 is a longitudinal sectional view showing a state where the cooled vessel is pressurized in the retort treatment tank, and FIG. FIG. 7 is a longitudinal sectional view showing a state in which the displacement of the sheet portion of the sheet lid is measured by a measuring instrument.

FIG. 8 is a diagram showing the measurement results of the displacement amount of the sheet portion of the sheet lid measured by the method of the present invention and examples of criteria for judging whether or not there is a leak.

FIGS. 9 and 10 show an embodiment of the leak inspection apparatus according to the present invention. FIG. 9 is a plan view and FIG.
0 is a front view.

FIGS. 11 and 12 show a conventional example of a container leak inspection technique. FIG. 11 shows a case where a reduced pressure is applied only to the top wall portion of a container, and the presence or absence of a leak is determined by the amount of deformation of the top wall. FIG. 12 is an overall vertical sectional view showing a means for placing the entire container in a constant reduced-pressure atmosphere and determining whether or not there is a leak in the container based on a change in pressure of the constant reduced-pressure atmosphere.

[0057]

[Explanation of symbols]

1; container, 2; container, 3; sheet lid, 4; contents,
5: retort treatment tank, 6: conveyor, 7; measuring instrument, 8; displacement sensor, 9;
Support base, 10; cylinder, 11; mounting column, 12; sorting machine,
13: stop piece, 14; standby piece, 15; guide bar, 16; hot liquid, 17;
Coolant, 18; can, 19; top wall, 20; measuring piece, 21; holding piece, 22; vacuum tank, 23;

Claims (7)

(57) [Claims] 1. A synthetic resin container molded into a bottomed cylindrical shape.
(2) The cooked contents (4) are filled and stored, and then sealed with a sheet lid (3). Subjecting the container (1) to a retort treatment under heating and pressurizing conditions; a cooling step; a step of pressurizing in a high-pressure atmosphere and returning to an atmospheric pressure atmosphere; and
(1) The sheet lid (3) based on the upper end edge of the cylindrical wall portion
And a step of measuring the height position of the container (1), and determining whether or not there is a leak in the container (1) according to the measured value of the height position of the sheet lid (3). . 2. The hermetic synthesis according to claim 1, wherein the retort treatment under heating and pressurizing conditions is performed with a high-temperature hot liquid (16), and the cooling after the retort treatment is performed with a cooling liquid (17). Inspection method for resin containers. 3. A large number of containers returned to atmospheric pressure atmosphere
3. The method according to claim 1, wherein the step (1) is carried out in a state of being aligned, and the step of measuring the height position of the sheet-made lid (3) is carried out during the course of carrying by the conveyor (6). 3. The leak inspection method for a hermetically-sealed synthetic resin container according to <1>. 4. A container made of synthetic resin molded into a bottomed cylindrical shape.
After filling and storing the cooked contents (4) in (2), the hermetic synthetic resin container (1) sealed with a sheet lid (3) is
Retort treatment under heating and pressurizing conditions, and after the retort treatment, cooling, pressurizing in a high-pressure atmosphere, and then returning to atmospheric pressure atmosphere, a retort treatment tank (5), and the retort treatment tank (5) A conveyor (6) that transports a large number of the containers (1) taken out from the inside into an atmospheric pressure atmosphere in an aligned state
And the container (1) being conveyed by the conveyor (6) is displaced downward from above, and the height of the sheet-made lid (3) is determined with reference to the upper edge of the cylindrical wall of the container (1). A leak inspection device for hermetically-sealed synthetic resin containers, comprising a measuring device (7) that can be moved up and down to measure the height. 5. The sheet body, which is the main body of the sheet lid body (3), is made of a laminated sheet of aluminum foil, and the measuring instrument (7) is connected to a container.
A support base (9) that abuts the lower surface on the upper edge of the cylindrical wall of (1)
Eddy current displacement sensor using electromagnetic induction (8)
5. The sealing device according to claim 4, wherein the sealing member is fixedly mounted at a fixed height position with respect to the lower surface of the support base so as to face the sheet member of the sheet lid body from above and from above. Leak inspection device for synthetic resin containers. 6. The measuring device, which is located downstream of a measuring position of the measuring device (7) on a conveying path formed by the conveying conveyor (6).
6. The hermetically sealed synthetic resin according to claim 4, further comprising a sorter (12) that intrudes into the transport path from outside the transport path so as to discharge the defective container (1) out of the transport path according to the measurement value of (7). Leak inspection device for containers. 7. A conveyor (6) below the measuring device (7).
A stop piece (13) for stopping the container (1) conveyed by means just below the measuring instrument (7) is provided, and the conveyer
On the upstream side of the measurement position by the measuring device (7) along the transport path formed by (6), a standby piece () for stopping the container (1) being transported in synchronization with the stop piece (13). The leak inspection apparatus for a hermetically sealed synthetic resin container according to claim 4, wherein 14) is provided.