JPH07270271A - Method and equipment for measuring gas barrier properties of plating film - Google Patents

Abstract

PURPOSE:To obtain a method for measuring gas barrier properties which enables reliable and accurate measurement of the gas barrier properties of a plating film on a vessel made of synthetic resin. CONSTITUTION:A cylindrical bottomed vessel 1 to be measured which is made of synthetic resin and provided with a plating film 2 on either the inner or outer wall at least is disposed in a testing chamber 3 having a vessel main body 4 and a cover member 5 closing up the opening of the main body airtightly, with the peripheral part of the opening of the vessel 1 brought into airtight contact with the cover member 5. Air in either the testing chamber 3 or the vessel 1 to be measured is replaced by a helium gas, while the other is subjected to vacuum evacuation, and the quantity of the helium gas contained in are exhaust gas is measured. 0n the occasion, at least one pressing jig 12 is fitted along the surface of the plating film of the vessel 1 to be measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to accurately evaluate the gas barrier property of a plating film applied to the wall surface of a synthetic resin container having a metal plating film formed thereon such as a vacuum insulating container made of a synthetic resin. The present invention relates to a gas barrier property measuring method and a measuring device.

[0002]

2. Description of the Related Art Conventionally, a heat insulating container made of glass or a metal such as stainless steel has been used as a container such as a thermos bottle or a warm lunch box. However, these have a problem that the shape and design of the container are limited in manufacturing. In addition, since the product is heavy, it is inconvenient to carry. Therefore, in place of the conventional glass or metal container, a synthetic resin heat insulating container that is easy to mold and lightweight has been proposed.

In this heat insulating container made of synthetic resin, an inner container and an outer container made of a synthetic resin are arranged in the outer container with a space therebetween, and the inner container is joined and integrated at respective mouth portions to have a double wall structure. The space between the inner and outer containers is vacuum-sealed to form a vacuum heat insulating layer. Since the inner container and the outer container are made of a synthetic resin and have a low gas barrier property, the surfaces of the inner container and the outer container on the vacuum insulation layer side, that is, the outer wall of the inner container and the inner wall of the outer container, are usually attached to each surface Forms a metal plating film. In addition to improving the gas barrier property, this metal plating film also has the effect of reducing heat loss due to radiation. Deterioration of the degree of vacuum in the heat insulating layer caused by gas such as water vapor, oxygen gas, and nitrogen gas entering the vacuum heat insulating layer can be prevented by forming a metal film on the inner and outer containers made of synthetic resin for a long period of time. Excellent heat retention performance can be maintained. Therefore, in such a synthetic resin container, it is necessary to measure and evaluate the gas barrier property of the plating film, and an accurate gas barrier property measuring method is required.

Conventionally, various methods have been known for measuring the amount of gas permeation in a plating film of this type, and when the amount of gas permeation is very small, for example, the plating film applied to a synthetic resin as described above. A helium permeation test is usually used to measure an extremely minute amount of gas permeation. This helium permeation test evaluates the gas barrier property of the object to be measured by setting the helium atmosphere on one side of the object to be measured and evacuating the other side to measure the amount of helium in the exhaust gas. Is the way.

[0005]

However, in the case of measuring the gas barrier property by the helium permeation method with respect to the synthetic resin container coated with the above-mentioned plated film,
When the side where the synthetic resin surface on one side is exposed is the helium gas region and the metal plating film surface side on the other side is the high vacuum region, a large pressure difference is created between both sides of this synthetic resin container. To be done. This pressure may cause deformation of the container made of synthetic resin having insufficient pressure resistance or a rectangular shape, which may damage the synthetic resin container itself, or may cause a gap between the synthetic resin part and the plating film. Occurrence of stress may cause defects such as cracking and swelling in the plating film, or may reduce the adhesion of the plating film, making it impossible to perform the helium permeation test. As described above, in the past, in order to measure and evaluate the gas barrier property of the plating film of the synthetic resin container, it may be impossible to accurately measure the permeation amount of a very small amount of gas using the helium permeation test. In addition, the container that has been subjected to this gas barrier property test may cause a defective product in subsequent commercialization, and there is a disadvantage that commercialization becomes difficult.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a gas barrier property measuring method and apparatus capable of reliably and accurately measuring the gas barrier property of a plating film in a synthetic resin container. I am trying.

[0007]

In order to solve the above problems, a method for measuring gas barrier properties of a plating film according to the present invention is a bottomed cylinder made of a synthetic resin having a plating film on at least one of an inner wall and an outer wall. -Shaped object container, in a test chamber provided with a container body and a lid member that hermetically closes the opening thereof, the opening peripheral portion of the object container is placed in airtight contact with the lid member, One of the test chamber and the object container is replaced with helium gas, and the other is evacuated to measure the amount of helium gas contained in the exhaust gas.

In the gas barrier property measuring method for the plating film, it is desirable to mount at least one pressing jig along the surface of the plating film of the object container. Further, it is desirable to dispose a soft material such as sponge, a soft rubber sheet, hard urethane, etc. on the plating film surface contact portion of the pressing jig.

The plating film gas barrier property measuring apparatus according to the present invention further comprises a container body provided with a first ventilation pipe and a second ventilation pipe, and a lid member for closing an opening of the container body. In the space formed by closing the opening of the container body with the lid member, a bottomed cylindrical container for the object to be measured made of a synthetic resin having a plated coating on at least one of the inner wall and the outer wall, A test chamber in which the opening is placed in a state of airtightly contacting the lid member; helium gas introducing means for supplying helium gas through one of the first ventilation pipe and the second ventilation pipe; A vacuum evacuation unit that evacuates a space communicating through the other of the first ventilation pipe and the second ventilation pipe, a measurement unit that measures the amount of helium gas in the exhaust gas that is evacuated, and a container for the object to be measured. The plating film surface of the DUT container It has a configuration in which a pressing tool for pressing the side.

In the apparatus for measuring the gas barrier property of a plating film, a flange is formed around the opening of the container body of the test chamber, and the flange of the object container is sandwiched between the flange and the lid member, and the measured object is measured. The object container may be arranged with its opening airtightly contacting the lid member.

Further, the lid member of the test chamber is provided with a fixing member for fixing a flange formed on the peripheral portion of the opening of the DUT container, and is fitted into the DUT container fixed by the fixing member. The stopper may be provided at a position where the lid member is provided, and the second ventilation pipe of the lid member may be provided so as to penetrate the stopper body. More preferably, the lid member side is recessed between the lid member and the stopper member. A spacer member having a groove may be provided, and a lid member may be provided with a third ventilation pipe communicating with the groove.

Further, the container body of the test chamber is supported by pressing the bottom portion of the DUT arranged in the test chamber so that the opening of the DUT is brought into airtight contact with the lid member. A configuration in which a support member is provided may be used.

Further, in the above-mentioned apparatus for measuring the gas barrier property of the plating film, it is desirable that a soft material such as a sponge, a soft rubber sheet, or hard urethane is arranged at the contact portion of the pressing jig with the plating film surface.

[0014]

According to the present invention, an object container such as a synthetic resin container is arranged such that its opening is in airtight contact with a lid member for sealing the test chamber, and one of the test chamber and the object container is placed. While evacuating the other with helium gas and measuring the amount of helium gas contained in the exhaust gas, the inside and outside of the DUT container are reliably partitioned and kept airtight. The helium gas introduced into either the inside or outside of the DUT container for measurement does not leak to the other vacuum exhaust side. Since the plating film surface of the DUT is pressed by the pressing jig, helium gas should be introduced to either the inside or the outside of the DUT, and the other side should be evacuated. The differential pressure generated inside and outside the container under test causes a load on the container wall and prevents damage or peeling of the plating film without deforming or destroying this container, which is accurate and reproducible. It is possible to measure and evaluate gas barrier properties.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. In this example, the case where the gas barrier property of the plating film 2 applied to the outer surface of the synthetic resin container 1 is measured is illustrated. In this embodiment, the synthetic resin container 1 is a bottomed rectangular container having an opening, and the outer wall thereof has a plated coating 2 made of a metal such as copper, silver, chromium, nickel or the like.

Plating layer 2 in this synthetic resin container 1
To measure the gas barrier properties of, this synthetic resin container 1
Are housed in an airtight test chamber 3 shown in FIG. The airtight test chamber 3 includes a bottomed tubular metal container body 4 and a thick plate lid member 5 that closes the opening. A first ventilation pipe 11 is provided in the metal container body 4,
A second ventilation pipe 10 is provided at the center of the metal lid member 5. In this embodiment, the first ventilation pipe 11
A vacuum pump (vacuum exhausting means) B is connected to the above, and a helium gas introducing means A is connected to the second ventilation pipe 10. A mass spectrometer (measuring means) C for measuring the amount of helium gas in the exhaust gas is provided in the middle of the conduit connecting the first ventilation pipe 11 and the vacuum pump B.

In order to arrange the synthetic resin container 1 in the test chamber 3, the flange portion 1a of the opening peripheral portion of the synthetic resin container 1 is provided in the opening peripheral portion of the metal container body 4 of the test chamber 3. It is arranged with a packing 6 between the flange 4a and the metallic lid member 5, and is tightened with a plurality of bolts 7, 7 penetrating the flange 4a of the metallic container body 4 of the test chamber 3 and the lid member 5. Then, the flange portion 1a of the synthetic resin container 1 is sandwiched between the flange 4a of the metal container body 4 of the test chamber 3 and the lid member 5 so as to be airtightly fixed. As a result, the synthetic resin container 1 is housed in the test chamber 3 while being shielded from the outside air. Moreover, the synthetic resin container 1 housed in the test chamber 3 is arranged such that the space 8 on the exposed portion 1b side of the synthetic resin surface and the space 9 on the plating film 2 side are completely separated by the container wall as a boundary. To be done.

Then, helium gas is introduced into the space 8 on the exposed portion 1b side of the synthetic resin surface through a second ventilation pipe 10 penetrating the metallic lid member 5. The gas in the space 8 is replaced with a helium gas atmosphere, and the space on the side of the plating film 2 in the test chamber 3 by the vacuum pump B is passed through the first ventilation pipe 11 arranged in the metal container body 4. Evacuate 9. Then, this exhaust gas is introduced into the mass spectrometer C connected in the middle of the exhaust pipe, and the amount of helium gas entrained in the exhaust gas is measured to evaluate the gas barrier property of the plating film 2.

At this time, a pressing jig 12 is arranged on the outer surface of the synthetic resin container 1 (on the side of the plating film 2) to make the plating film 2
It is designed to prevent cracking and peeling. The pressing jig 12 is a sponge-like substance that contacts the surface of the plating film 2.
A protection member 13 made of expanded polystyrene or a soft rubber sheet, and a metal or rubber band on the outside thereof,
A strength member 14 such as a band-shaped tape is provided, and the plating film 2 is pressed against the outer surface of the synthetic resin container 1, that is, the plating film 2 by tightening the strength member 14 via the protection member 13. It is preferable that the pressing jig 12 is attached before the synthetic resin container 1 is housed in the test chamber 3 and is provided at a plurality of positions on the plating surface at substantially equal intervals.

In the method of measuring the gas barrier property of the plating film according to the present embodiment, not only the plating film 2 can be prevented from peeling off even if the surface side of the plating film 2 is sucked by vacuum decompression, but the outside of the synthetic resin container 1 is prevented. Is evacuated and a helium gas atmosphere is created in the interior to create a pressure difference between the inside and the outside of the synthetic resin container 1 and prevent the damage even though a load is applied toward the outside. Therefore, it is particularly suitable for the test of a rectangular container which is likely to be damaged by the load.

FIG. 2 illustrates a second embodiment of the present invention. In this embodiment, instead of the synthetic resin container 1 in the first embodiment having the plating film 2 on the outer surface thereof, the plating film of the synthetic resin container 1 having the inner wall with the plating film 2 is applied. This is an example of the case of evaluating the gas barrier property of. The mounting of the synthetic resin container 1 in the test chamber 3 is performed in the same manner as in the first embodiment. In this embodiment, the helium gas introducing means A is connected to the first ventilation pipe 11 provided in the metal container body 4, and the second ventilation pipe 10 provided in the metal lid member 5 is vacuumed. Connect pump B. As described above, the plating film 2 is applied to the inner wall of the synthetic resin container 1, and the gas barrier property of the plating film 2 is exposed to the synthetic resin surface (outer wall) of the synthetic resin container 1 on which the plating film is not applied. Helium gas from the first ventilation pipe 11 provided in the metal container body 4 in the open space 8 (in this case, the space defined by the metal container body 4 of the test chamber 3 and the outer wall of the synthetic resin container 1). On the other hand, the space 9 in which the plating film 2 of the synthetic resin container 1 is exposed by the second ventilation pipe 10 penetrating the metal lid member 5 and communicating with the inside of the synthetic resin container 1 ( In this case, the inside of the synthetic resin container 1) is evacuated by the vacuum pump B, and this exhaust gas is introduced into the mass spectrometer C to measure the amount of helium gas entrained in the exhaust gas to measure the gas barrier property of the plating film 2. Evaluate.

At this time, a pressing jig 20 is arranged in the synthetic resin container 1 on which the plating film 2 is applied, and the plating film 2 is pressed and held along the inner wall. The pressing jig 20 includes a protective member 21 made of a material such as a soft rubber sheet or a sponge-like substance that does not damage the plating film 2, and presses the protection member 21 outward. As described above, the strength member 22 has an outer diameter shape that is substantially equal to or slightly smaller than the inner shape of the synthetic resin container 1. The strength member 22 is preferably formed of a porous body, for example, a molded body of hard urethane, calcium silicate, sintered metal, or the like, or a frame body so that the gas can pass therethrough. In this case, the pressing jig 20 is described as the protection member 21 and the strength member 22 being separate bodies, but if a member capable of holding the shape is used with a material having low hardness such as hard urethane,
Alternatively, the protection member 21 and the strength member 22 may be integrated into a single pressing member.

The gas barrier property of the plating film 2 applied to the inner wall of the synthetic resin container 1 according to this example was evaluated and measured as follows.
Helium gas is introduced into the test chamber 3 through the first ventilation pipe 11 provided in the metal container body 4, and the space 8 to which the synthetic resin surface 1b of the synthetic resin container 1 is exposed is replaced with helium gas. The second ventilation pipe 10 provided on the metal lid member 5
The space 9 (inside the synthetic resin container 1) on the side of the plating film 2 of the synthetic resin container 1 is evacuated by the vacuum pump B.
The gas barrier property of the plating film 2 is evaluated by guiding the exhaust gas to the mass spectrometer C and measuring the amount of helium gas entrained. At this time, in the synthetic resin container 1, the helium gas introduced into the space 8 on the outer wall side and the space 9 on the inner wall side are evacuated to generate a differential pressure across the container wall, and Although a load is applied from the outside, by disposing the pressing jig 20 inside the synthetic resin container 1, it is possible to prevent the synthetic resin container 1 from being deformed or damaged due to the applied load, and further, it is possible to form a plating film. Since peeling of No. 2 can be prevented, accurate evaluation and measurement of the gas barrier property becomes possible.

FIG. 3 illustrates a third embodiment of the present invention. In this embodiment, the flange of the opening flange portion 31a of the synthetic resin container 31 is short, and as in the first and second embodiments, the opening flange 4a of the metal container body 4 forming the test chamber 3 and the metal This measurement method is suitable when the lid-making member 5 cannot hold it. In this case, the opening flange portion 31a of the synthetic resin container 31 is airtightly held by the fixing member 33 and attached to the inner surface of the metal lid member 5 via the packing 32. Reference numeral 34 in this figure is a tightening bolt.

On the upper surface of the metallic lid member 5, as shown in FIG.
As shown in (a) and (b), a concave spacer member 35 made of metal such as stainless steel in which a concave groove 35a is formed on one surface side and a flat surface 35b on the other surface side is formed on the concave groove 35a side surface. It is arranged so as to be in contact with the lid-making member 5, and a rubber plug 36 made of silicon rubber or the like having a shape matching the opening shape of the synthetic resin container 31 is placed on the upper portion of the lid member 5 and the bolt 37.
These are tightly fixed to the metallic lid member 5, and the plug 36 is fitted into the synthetic resin container 31. The second ventilation pipe 10 provided on the metallic lid member 5 extends through the spacer member 35 and the plug body 36 so that the open end thereof is located above the plug body 36.

With this structure, when the synthetic resin container 31 is mounted on the metal lid member 5, the stopper 36 is tightly inserted into the opening of the synthetic resin container 1 and is capped. As described above, the flange member 31a around the opening of the synthetic resin container 1 is tightened and mounted via the packing 32 by the fixing member 33. After that, the metal lid member 5 having the above-mentioned synthetic resin container 31 mounted on the flange portion 4a of the metal container body 4 is tightened and fixed with bolts 7 via the packing 6.

Since the outer wall of the synthetic resin container 31 shown in FIG. 3 is coated with the plating film 2, the gas barrier property is measured by the synthetic resin container 31 in the same manner as in the first embodiment. The helium gas is attached along the outer wall of the container 31, and the helium gas is introduced from the second ventilation pipe 10 to the inside of the synthetic resin container 31 to be replaced with the helium gas.
The compartment 9 on the outer side of the synthetic resin container 1 from 1 is evacuated, and the amount of helium gas in the exhaust gas is analyzed by the mass spectrometer C to evaluate the gas barrier property of the plating film 2.

Further, in the present embodiment, the helium gas introduced into the synthetic resin container 31 permeates the plug 36 and the mounting packing 32 and leaks into the space 9 on the vacuum exhaust side to cause an error in measurement. To prevent
The concave groove portion 3 of the spacer member 35 is provided on the metal lid member 5.
A third ventilation pipe 38 communicating with 5a is provided, and the inside of the concave groove 35a can be exhausted by a vacuum pump. As a result, the helium gas introduced into the compartment 8 inside the synthetic resin container 31 passes through the plug 36, passes through the packing 32,
It can be prevented from flowing into the space 9 that is being evacuated, and the amount of helium gas that permeates the plating film 2 can be accurately measured.

In this embodiment, a synthetic resin container 31 is used.
Although the case of measuring the gas barrier property of the plating film 2 applied to the outer wall of is exemplified, when the plating film 2 is applied to the inner wall of the synthetic resin tree container 31, similar to the second embodiment, The pressing jig 20 arranged inside the synthetic resin container 31 is used, and the introduction of the helium gas is performed by the first ventilation pipe 11
Is supplied to the space 8 through the second ventilation pipe 10, and the space 9 is evacuated through the second ventilation pipe 10.

FIG. 5 illustrates a fourth embodiment of the present invention. In this embodiment, a vertically movable support member 40 is provided at the bottom of the metal container body 4 that constitutes the test chamber 3, and the support member 40 presses and holds the bottom of the synthetic resin container 31. I am configuring.

The support member 40 has an inverted T-shape having a smooth table portion at one end and a shaft rod 42 integrally connected to the center of the smooth table portion at the other end. The end portion of the shaft rod 42 penetrates the bottom portion of the metal container body 4 through the shield packing 44 in an airtight manner so as to be vertically movable, and extends to the outside. Then, a nut 45 is screwed into a male screw groove 42a provided on the shaft rod 42, and the supporting member 40 is vertically movably attached to the bottom of the metal container body 4. Reference numeral 46 is a fixing screw for fixing the nut.

With this apparatus, the test chamber 3 is provided with a synthetic resin container 31.
In order to store and hold the pipes, as in the third embodiment shown in FIG. 3, after the pipe 10 is penetrated through the metal lid member 5, the spacer member 35 and the plug body 36 are arranged and fixed with the bolts 37. While fitting the opening of the synthetic resin container 31 into the plug body 36, the metal container body 4 having the support member 40 is placed on the metal lid member 5 via the packing 32 at the tip of the opening, and The flange portion 4a around the opening of the container body 4 and the metallic lid member 5 are overlapped with each other via the packing 6, and the bolt 7 is tightly tightened to integrally join them.

Subsequently, the supporting member 40 provided on the bottom portion 4b of the metal container body 4 is rotated by the nut 45, and the table portion 41 is rotated.
Is moved until the smooth surface thereof comes into contact with the bottom of the synthetic resin container 31, and the support member 40 presses the bottom of the synthetic resin container 31. By pressing the bottom of the synthetic resin container 31 by the support member 40 in this manner, the opening end surface of the synthetic resin container 31 is pressed against and held by the packing 32. The support member 4 may be used during the gas barrier property test.
The nut 45 is preferably fixed with a fixing screw 46 so that the pressure retention by 0 is not loosened. Also, the table section 4
A soft cushioning member 47 such as sponge, soft rubber, or urethane foam may be provided on the smooth surface of No. 1 so as not to damage the bottom contact surface of the synthetic resin container 31, and especially on the bottom contact surface. When the plating film 2 is applied, it is desirable to dispose the soft cushioning member 47.

Thus, the synthetic resin container 31 is used in the test chamber 3
When the synthetic resin container 31 is stored, the plating film 2 surface side and the synthetic resin surface side are hermetically isolated and housed therein.
The proper use of the pressing jig, the introduction of helium gas, and the vacuum evacuation are the same as in the first embodiment shown in FIG. 1 when the plating film 2 is applied to the inner wall, and the plating film 2 is applied to the outer wall. If so, it is performed in the same manner as in the second embodiment shown in FIG.

In the measuring method according to this embodiment, even for a synthetic resin container 31 having a small opening flange portion or no flange, the inner wall side and the outer wall side can be airtightly divided, so that the container can be accurately measured. A gas barrier property test can be performed. In this example, the method for measuring the gas barrier property of the plating film when the plating film is applied to at least one of the inner wall and the outer wall of the synthetic resin container is not limited to this, and the device of the present invention is not limited to this. Of course, it can also be used for the gas barrier property test of the synthetic resin container wall surface not coated with a plating film.

[0036]

As described above, according to the present invention,
By placing the DUT container such as a synthetic resin container in an airtight manner with its opening part in contact with the lid member that seals the test chamber, and storing it in the container body of the test chamber, The outside is surely kept airtight, and the helium gas that is introduced into either the inside or outside of the DUT container for measurement does not leak to the other vacuum exhaust side, and plating is performed. The gas barrier property of the coating can be measured extremely accurately. Further, since the plating film surface of the DUT is pressed by the pressing jig, helium gas is introduced into either the inside or the outside of the DUT,
By evacuating the other side, the pressure difference between the inside and the outside of the container to be measured does not apply a load to the container wall and the container is not deformed or destroyed, so that the measurement can be reliably performed. Furthermore, by using this pressing jig, it is possible to prevent damage and peeling of the plating film, and it is possible to perform accurate and reproducible measurement and evaluation of the gas barrier property.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating a first embodiment of the present invention.

FIG. 2 is a sectional view illustrating a second embodiment of the present invention.

FIG. 3 is a sectional view illustrating a third embodiment of the present invention.

4 (a) is a perspective view of a spacer member used in the embodiment shown in FIG. 3, and FIG. 4 (b) is a sectional view taken along line AA ′ of the same member.

FIG. 5 is a sectional view illustrating a fourth embodiment of the present invention.

[Explanation of symbols]

1, 31 …… Synthetic resin container (measurement object container), 2 ……
Plating film, 3 ... Testing room, 4 ... Metal container body, 5
...... Metal lid member, 10 ...... Second ventilation pipe, 11 ...... First ventilation pipe, 12,20 ...... Pressing jig, 33 ...... Fixing member, 35 ...... Spacer member, 35a ...... Concave Groove, 36 ...
... stopper, 38 ... third ventilation pipe, 40 ... support member, A
...... Helium gas introducing means, B ... vacuum pump (vacuum exhausting means), C ... mass spectrometer (measuring means).

Front page continuation (72) Inventor Seiichi Ito 1-16-7 Nishishimbashi, Minato-ku, Tokyo Inside Nihon Oxygen Co., Ltd.

Claims (9)

[Claims] 1. A test chamber provided with a bottomed cylindrical container to be measured made of a synthetic resin having a plating film on at least one of an inner wall and an outer wall, and a container body and a lid member for hermetically closing the opening thereof. In, the opening peripheral portion of the measured object container is placed in contact with the lid member in an airtight manner, and one of the test chamber or the measured object container is replaced with helium gas, and the other is evacuated to vacuum. A method for measuring the gas barrier property of a plating film, which comprises measuring the amount of helium gas contained in the exhaust gas. 2. The method of measuring the gas barrier property of a plating film according to claim 1, wherein at least one pressing jig is attached along the surface of the plating film of the object container. 3. The gas barrier property measuring method for a plating film according to claim 2, wherein a soft material such as sponge, a soft rubber sheet, and hard urethane is arranged in the contact portion of the pressing jig with the plating film surface. 4. A container body provided with a first ventilation pipe,
A lid member having a second vent pipe and closing the opening of the container body, and a plating film on at least one of an inner wall and an outer wall in a space formed by closing the opening of the container body with the lid member. A test chamber in which a bottomed cylindrical object-to-be-measured container made of synthetic resin subjected to the above is placed with its opening airtightly contacting the lid member, the first ventilation pipe and the second communication pipe. Helium gas introduction means for supplying helium gas through one of the trachea, vacuum evacuation means for evacuating the space communicating through the other of the first ventilation pipe and the other of the second ventilation pipe, and evacuated exhaust Gas barrier property of plating film, comprising: a measuring means for measuring the amount of helium gas in the gas; and a pressing jig for pressing the plating film surface of the object container under measurement against the wall side of the object container. measuring device. 5. A flange is formed on an opening peripheral portion of a container body of a test chamber, the flange of the DUT container is sandwiched between the flange and the lid member, and the DUT container is covered with the opening. The gas barrier property measuring device for a plating film according to claim 4, wherein the gas barrier property measuring device is arranged so as to be in air-tight contact with the above. 6. A lid member for a test chamber is provided with a fixing member for fixing a flange formed on an opening peripheral portion of the DUT container, and the fitting member is fitted and inserted into the DUT container fixed by the fixing member. The gas barrier property measuring device for a plating film according to claim 4, wherein a stopper is provided at a position where the stopper is provided, and the second ventilation pipe of the lid member is provided so as to penetrate the stopper. 7. A spacer member having a concave groove that is recessed toward the lid member is provided between the lid member and the plug body, and a third vent pipe communicating with the concave groove is provided in the lid member. The gas barrier property measuring device for a plating film according to claim 6. 8. The container main body of the test chamber is supported by pressing the bottom of the DUT arranged in the test chamber so that the opening of the DUT is brought into airtight contact with the lid member. The gas barrier property measuring device of the plating film according to claim 4, further comprising a supporting member. 9. The plating according to claim 4, wherein a soft material such as a sponge, a soft rubber sheet, or a hard urethane is disposed on the plating film surface contact portion of the pressing jig. Measuring device for gas barrier property of coating.