JP2005201701A - Method and apparatus for determining non-destructive airtightness of plugs - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-destructive airtightness judging method for a spigot capable of nondestructively judging the airtightness of a spigot having a space that is hermetically shut off from the outside between the spigot body and the resealing lid obtain.
The plug body 2 is provided with a lid 13 for resealing, and the mouthpiece 2 having a space 17 that is hermetically shielded from the outside between the mouthpiece body 3 and the resealable lid body 13 is usually provided. The airtightness of the space 17 is determined by performing a treatment of immersing in the carbon dioxide gas 20 having a higher concentration than the atmospheric air, and then measuring the infrared absorption rate of the space 17 in the plug 2.
[Selection] Figure 1

Description

  The present invention provides a non-destructive determination of the airtightness of a plug having a reseal lid on the spigot body and having a space that is hermetically blocked from the outside between the plug main body and the reseal lid. The present invention relates to a method and apparatus for determining the non-destructive airtightness of a plug.

  Paper liquid containers and thermoplastic resin liquid bottle containers are widely used as containers for liquid foods such as juice, coffee, milk, liquor, noodle soup and soy sauce, and functional liquids such as cosmetics, chemicals, and engine oil. Yes. In order to pour out the liquid contents from the container, there are those fitted with synthetic resin plugs. As such plugs, the plug body is provided with a lid for resealing, and the plug body is resealed. Many plugs having a space that is hermetically blocked from the outside between the lid and the lid are often used.

  As such plugs, for example, in paper liquid containers, the plugs shown in FIGS. 4 and 5 are known. In the mouthpiece 2 of the paper liquid container 1 shown in the same figure, the mouthpiece main body 3 is sealed with a partition wall 5 provided below the inside of the dispensing tube 4. An annular notch 6 having an inverted V-shaped vertical cross section is provided on the lower surface to form an annular thin line of weakness (virtual line) on the upper surface. For example, a pull ring is formed on a part of the inner upper surface of the annular thin line of weakness. 7 is provided upright, and at the lower end of the pouring cylinder 4, a flange 10 is formed as an attachment portion to be welded to the inner wall 9 of the paper liquid container 1. Further, the pouring cylinder 4 A screw thread 11 is formed on the outer periphery of the tube, and a reseal lid 13 having a screw groove 12 formed on the inner periphery is airtightly screwed onto the outer periphery of the pouring tube 4. Has been.

  Further, a stopper as shown in FIGS. 6 and 7 is also known in a liquid bottle container made of a thermoplastic resin. The stopper 2 of the liquid bottle container 14 made of the thermoplastic resin shown in the same figure is also sealed with a stopper body 3 provided with a partition wall 5 in the middle of the dispensing tube 4. An annular cut 6 having an inverted V-shaped vertical cross section is provided on the lower surface of the substrate, and an annular thin line of weakness (virtual line) is formed on the upper surface. A support column 8 provided with a pull ring 7 is erected, and a fixing portion 16 fixed to the opening 15 of the liquid bottle container 14 made of thermoplastic resin is formed on the lower side of the dispensing tube 4. A screw thread 11 is formed on the outer periphery of the upper side of the outlet cylinder 4, and a reseal lid 13 having a screw groove 12 formed on the inner periphery of the outlet cylinder 4 is airtight. It is screwed and attached.

  In the plug 2 provided with the resealing lid 13 on the plug body 3, from the viewpoint of hygiene, contamination in the plug body 3 must be prevented. It is necessary that the re-sealing lid 13 is airtightly attached to the plug body 3. If this is insufficient, a contamination source will enter the plug body 3 from the outside and contaminate the plug body 3. Will end up.

  For example, the filling method of the paper liquid container 1 is called hot filling, and there is a method of filling the filling liquid as the contents by heating to a high temperature close to 100 ° C. In this case, the paper liquid container 1 immediately after filling is used. May be immersed in cold water for water cooling. At this time, if the plug body 3 of the plug 2 attached to the paper liquid container 1 and the resealing lid body 13 are insufficiently attached, the plug body 3 and the resealing lid body 13 Since the space 17 in the space 17 immediately after hot filling expands the air in the space 17 and the internal pressure increases, a part of the air leaks out of the space 17 and is then immersed in water. In this case, the air in the space 17 is cooled and contracted, and the pressure is reduced, so that the cooling water enters the space 17 and contaminates the plug body 3.

  Usually, the reseal lid 13 is attached to the plug body 3 so as to be airtight using a machine. For example, the reseal lid 13 is over-screwed or the reseal lid 13 is sealed. The screw thread 11 is crushed due to, for example, being screwed obliquely into the screw thread 11 of the plug body 3, or the resealing lid 13 and the plug body 3 are initially attached. Since the airtightness may be lost due to looseness of the lid 13 for resealing due to the transportation of the plug 2 or the like, the above-mentioned contamination trouble is caused.

  For this reason, in the plug 2, it is necessary that the reseal lid 13 is securely and airtightly attached to the plug body 3. It is difficult to make a sufficient judgment just by looking at whether the installation is airtight or inadequate, and as a measure to prevent such contamination problems, all plugs 2 must be manually tightened. There is no current situation.

On the other hand, as a method for non-destructively inspecting the leakage of contents from the dispensing tube 4, a container provided with a sealing unit having a gas valve and a liquid valve is transported upside down onto the conveyor, It is disclosed that an electrode projecting into the liquid storage member is provided so as to be movable toward the spout by the driving means, and a dilution liquid is supplied by the water supply means to check the leakage of the content liquid (for example, , See Patent Document 1). However, it cannot be adopted as a method of determining the airtightness of the plug for preventing the contamination trouble in the plug body due to the entry of the contamination source from the outside as described above.
JP-A-11-160194

  As described above, there is a plug having a reseal lid attached to the cap body, and whether the resealing lid is conventionally airtight or insufficient on the plug body. There is no measurement method, and as a measure for preventing troubles due to insufficient airtightness, there has been a problem that a troublesome work such as manually tightening all the plugs is unavoidable.

  An object of the present invention is to provide a non-destructive airtightness of a plug capable of nondestructively determining the airtightness of a plug having a space that is airtightly blocked from the outside between the plug main body and the lid for resealing. To provide a determination method and apparatus.

Each means of the present invention for achieving the above object will be described as follows.
A non-destructive airtightness determining method for a plug according to claim 1, wherein the plug body includes a resealing lid, and the space between the plug body and the resealing lid is airtightly blocked from the outside. It is characterized by performing a treatment of immersing the plug having the above in a carbon dioxide gas having a higher concentration than normal air, and then measuring the infrared absorption rate of the space in the plug.

  According to a second aspect of the present invention, there is provided a nondestructive airtightness judging method for a plug according to the first aspect, wherein the treatment of immersing the plug in the carbon dioxide gas is performed by pressurizing the carbon dioxide gas.

  The non-destructive airtightness determining device for a plug according to claim 3, wherein the plug body includes a resealing lid, and the space between the plug body and the resealing lid is airtightly blocked from the outside. A transfer device for transferring a plug having a cap, a carbon dioxide containing container for immersing the plug in a carbon dioxide gas having a concentration higher than that of normal air during the transfer, and the plug after the carbon dioxide is immersed And an infrared detector for measuring the infrared absorptance of the space in the plug during the transfer.

  According to a fourth aspect of the present invention, there is provided the non-destructive airtightness determining apparatus for a plug according to the third aspect, wherein the carbon dioxide containing container includes a pressurizing means for pressurizing the carbon dioxide.

  The non-destructive airtightness determining device for a plug according to claim 5 is the apparatus according to claim 4, wherein the pressurizing means is configured to attach a cylinder to the plug on the support base in the carbon dioxide gas in the carbon dioxide gas storage container. Further, the carbon dioxide gas in the cylinder is pressurized by operating a piston.

According to the present invention, the following excellent effects can be obtained.
A non-destructive airtightness determining method for a plug according to claim 1, wherein the plug body includes a resealing lid, and the space between the plug body and the resealing lid is airtightly blocked from the outside. The plug having the above is treated by immersing it in a carbon dioxide gas having a concentration higher than that of normal air, and then the infrared absorption rate of the space in the plug is measured. Therefore, when the plug is soaked in carbon dioxide gas, carbon dioxide gas does not enter the space if the space of the plug has sufficient airtightness, but the space is insufficient if the airtightness is insufficient. When carbon dioxide gas penetrates into the inside and the infrared absorption rate of the space of the plug after this carbon dioxide immersion treatment is measured, the carbon dioxide gas absorbs infrared rays. On the other hand, it can be seen that the greater the infrared absorption rate, the worse the airtightness of the plug, and the airtightness can be determined with high accuracy simply by obtaining the infrared absorption rate. Thereby, since it is possible to easily and surely find a plug with poor airtightness due to poor mounting of the reseal lid to the plug body, such a plug can be easily removed, This frees you from the troublesome task of tightening by hand.

  The non-destructive airtightness determining method for a plug according to claim 2 is the carbon dioxide gas immersion treatment of the plug according to claim 1, wherein the carbon dioxide gas is pressurized during the carbon dioxide immersion treatment of the plug. Can be performed in a short time, and the non-destructive airtightness determination of the plug can be performed efficiently.

  The non-destructive airtightness determining device for a plug according to claim 3, wherein the plug body includes a resealing lid, and the space between the plug body and the resealing lid is airtightly blocked from the outside. A transfer device for transferring a plug having a cap, a carbon dioxide containing container for immersing the plug in a carbon dioxide gas having a concentration higher than that of normal air during the transfer, and the mouth after being immersed in the carbon dioxide gas The stopper is provided with an infrared detector that measures the infrared absorption rate of the space in the stopper in the middle of the transfer, so that the stopper is turned into the carbon dioxide by the carbon dioxide containing container in the middle of the transfer of the stopper. It is possible to measure the infrared absorptance of the space in the plug after immersion in carbon dioxide gas by the dipping process and the infrared detection device, and it is possible to efficiently determine the non-destructive airtightness of the plug. . Thereby, since it is possible to easily and surely find a plug with poor airtightness due to poor mounting of the reseal lid to the plug body, such a plug can be easily removed, This frees you from the troublesome task of tightening by hand.

  The non-destructive airtightness determining device for a stopper according to claim 4 is the carbon dioxide gas immersion device according to claim 3, wherein the carbon dioxide gas storage container includes a pressurizing means for pressurizing the carbon dioxide gas. During processing, carbon dioxide gas can be pressurized by means of pressurization provided in the carbon dioxide container, so that the carbon dioxide immersion treatment of the plug can be performed in a short time, and the non-destructive airtightness determination of the plug Can be performed efficiently.

  The non-destructive airtightness determining device for a plug according to claim 5 is the apparatus according to claim 4, wherein the pressurizing means is configured to attach a cylinder to the plug on the support base in the carbon dioxide gas in the carbon dioxide gas storage container. Since it is configured to pressurize the carbon dioxide gas in the cylinder by operating the piston, it can be performed by pressurizing the carbon dioxide gas with a simple pressurizing means during the carbon dioxide gas immersion treatment of the plug. it can.

Hereinafter, a first example of the best mode for carrying out the nondestructive airtightness judging method and apparatus for a plug according to the present invention will be described.
FIG. 1 is a schematic configuration diagram showing an example of an embodiment of an apparatus for carrying out a non-destructive airtightness judging method for a plug according to the present invention, and FIG. 2 is a perspective view showing a relationship between a transfer device and the plug. In addition, the same code | symbol is attached | subjected and shown to the part corresponding to FIGS. 4-7 mentioned above.

  The plug non-destructive airtightness determining apparatus of this example includes a lid 13 for resealing on the plug body 3, and is hermetically blocked from the outside between the plug body 3 and the lid 13 for resealing. A transfer device 19 comprising a conveyor 18 for transferring the stopper 2 having the space 17; a carbon dioxide containing container 21 for immersing the stopper 2 in a carbon dioxide gas 20 having a higher concentration than normal air in the middle of the transfer; The plug 2 after the immersion treatment of the gas 20 is provided with an infrared detecting device 22 that measures the infrared absorption rate of the space 17 in the plug 2 during the transfer.

  The transfer device 19 composed of the conveyor 18 is not particularly limited in its configuration as long as it can divert those commonly used in food machinery and can transfer the plug 2. In this example, the conveyor 18 is composed of two conveyor belts 18a and 18b arranged in parallel, and the two conveyor belts 18a and 18b are arranged on the outer periphery of the extraction cylinder 4 and the extraction cylinder 4 of the spout 2. The resealing lid 13 that is screwed together is sandwiched and transferred from both sides. The conveyor belts 18a and 18b are preferably made of rubber or the like in order to prevent slippage at a portion in contact with the plug 2. The transfer device 19 including the conveyor 18 enters the carbon dioxide gas storage container 21 from the upper part of the carbon dioxide gas storage container 21, and goes out from the upper part of the carbon dioxide gas storage container 21 through the carbon dioxide gas 20 accommodated therein. It arrange | positions so that the infrared detection apparatus 22 may be passed.

  The carbon dioxide container 21 contains carbon dioxide 20 having a concentration higher than that of normal air. In this example, a stainless steel container is used, but it is made of plastic or other material. Also good. Further, since the carbon dioxide containing container 21 has a specific gravity greater than that of the air, the carbon dioxide containing container 21 can be used without any problem even if the upper portion is opened as shown in the figure, but it reduces the outflow of the carbon dioxide gas 20. For the purpose, the upper opening of the carbon dioxide container 21 may be covered with a lid provided with a hole serving as the entrance / exit of the conveyor 18. The carbon dioxide gas 20 stored in the carbon dioxide containing container 21 can be used in a concentration range of 0.1% to 100%, but a concentration of 95% to 100% is preferable.

  In this example, as described above, the conveyor 18 enters the carbon dioxide gas storage container 21 from the upper part of the carbon dioxide gas storage container 21, dives in the carbon dioxide gas 20 that is stored, and exits from the upper part of the carbon dioxide gas storage container 21. It is arranged so as to come out, and the stopper 2 conveyed by the conveyor 18 enters the carbon dioxide container 21 as the conveyor 18 moves, and is immersed in the carbon dioxide gas 20 so as to be immersed. Yes.

  The infrared detector 22 is provided with a light source (not shown) that emits infrared light on one side across a measurement groove 22a through which the conveyor 18 passes, and the other side receives infrared light emitted from the light source. A detector (not shown) is provided to emit light from a light source on one side so as to hit the space 17 toward the plug 2 after the immersion treatment passing through the measurement groove 22a as the conveyor 18 moves. The infrared ray is irradiated, and the detector on the other side receives the infrared ray transmitted through the plug 2 and measures the amount thereof to obtain the infrared absorption rate. As the infrared detector 22, a Fourier transform infrared spectrophotometer manufactured by HORIBA was used in this example.

The plug non-destructive airtightness determining method according to the present invention is implemented using the apparatus configured as described above.
First, the stopper 2 is transferred from the upper part of the carbon dioxide storage container 21 into the carbon dioxide storage container 21 by the conveyor 18 constituting the transfer device 19, and the stopper 2 is stored in the carbon dioxide storage container 21. It is immersed in 20 and dipped. At this time, if the airtightness of the space 17 formed between the plug body 3 and the reseal lid 13 in the plug 2 is perfect, carbon dioxide gas does not enter the space 17, but the airtightness is reduced. If it is insufficient, the carbon dioxide gas 20 penetrates into the space 17 according to the degree of insufficiency. The immersion time of the plug 2 is not particularly limited, but if the immersion time is short, the accuracy of determining the airtightness of the space 17 described later is inferior. Further, if the immersion time is long, the accuracy of determining the airtightness of the space 17 is increased, but if it is too long, the processing efficiency is inferior and is not practical. The immersion time for immersing the plug 2 in the carbon dioxide gas 20 can be set by changing the speed of the conveyor 18 serving as the transfer device 19 and the length of the conveyor 18 immersed in the carbon dioxide gas 20.

  Next, the plug 2 that has been immersed in the carbon dioxide gas 20 as described above is transferred to the infrared detector 22 by the conveyor 18 and passed through the measurement groove 22a. Then, infrared rays are irradiated toward the plug 2 passing through the measurement groove 22a so as to strike the space 17, the amount of infrared rays transmitted through the plug 2 is measured, and the infrared absorption rate is obtained.

  Since carbon dioxide gas 20 absorbs infrared rays, as a result of measuring the infrared absorptance, the smaller the infrared absorptivity, the smaller the penetration of carbon dioxide gas into the space 17 of the spigot 2. It can be seen that as the airtightness is better and the infrared absorption rate is larger, the carbon dioxide gas penetrates into the space 17 of the mouthpiece 2 more frequently, and the mouthpiece 2 is less airtight. In this way, the airtightness of the space 17 formed between the plug body 3 and the reseal lid 13 in the plug 2 can be determined with high accuracy simply by obtaining the infrared absorption rate.

The relationship between the infrared rays and carbon dioxide in the infrared detector 22 will be described in detail. As is apparent from Table 1 of Example 1 described later, the carbon dioxide absorption region exists in the near infrared region of 2250 to 2400 cm ^−1. In particular, the maximum absorption is shown near 2370 cm ⁻¹ . On the other hand, among thermoplastic resins, polyolefin resins such as polyethylene resin and polypropylene resin that are often used as the material of the plug 2 that is the subject of the present invention do not normally absorb infrared rays in the range of 2100-2550 cm ^−1. .

Therefore, in the method of the present invention, when infrared rays having a wavelength of around 2370 cm ⁻¹ are used, infrared rays are irradiated from the outside so as to hit the space 17 of the plug 2 subjected to the carbon dioxide immersion treatment as described above. The airtightness can be determined with high accuracy simply by receiving the infrared rays transmitted through the plug 2 and measuring the amount of infrared rays and obtaining the infrared absorption rate from the result. That is, at this time, it can be seen that the greater the infrared absorption rate, the worse the airtightness of the plug 2, and if a calibration curve is created, the amount of carbon dioxide gas entering the plug 2 can be known almost accurately. it can.

  Even when the plug 2 is made of a material other than polyolefin, by using infrared rays having a wavelength that is absorbed by carbon dioxide gas and hardly absorbed by the material, the plug 2 according to the present invention can be used in the same manner as described above. Airtightness can be determined.

  FIG. 3 is a perspective view of a principal part showing a second example of the embodiment of the apparatus for carrying out the non-destructive airtightness judging method for a plug according to the present invention. Note that portions corresponding to those in FIGS. 1 and 2 described above are denoted by the same reference numerals.

  The non-destructive airtightness judging device for the stopper of this example is the carbon dioxide gas accommodated in the carbon dioxide containing container 21 of the nondestructive airtightness judging device for the stopper of the first example described above. The pressurizing means 23 for pressurizing 20 is provided, and other configurations are the same as those in the first example.

  The pressurizing means 23 is installed in the carbon dioxide containing container 21. More specifically, the conveyor 18 of the transfer device 19 is separated into a first conveyor 18A and a second conveyor 18B in the carbon dioxide container 21, and between the first conveyor 18A and the second conveyor 18B. In addition, a relay conveyor 24 for sending the stopper 2 transferred from the first conveyor 18A to the second conveyor 18B is arranged. The relay conveyor 24 is installed at a position where it is buried in the carbon dioxide gas 22 accommodated in the carbon dioxide containing container 21, and is arranged at a loop-like rubber conveyor belt 24a and at both ends of the conveyor belt 24a. And a stainless steel roll 25 that rotates the conveyor belt 24a.

  Then, on the side of the first conveyor 18A of the conveyor belt 24a, the stopper 2 transferred from the first conveyor 18A is guided to a predetermined position on the conveyor belt 24a, that is, a position corresponding to a pressure cylinder described later. A guide rail 26 is provided, and a guide rail 27 for guiding the stopper 2 on the conveyor belt 24a to the second conveyor 18B is provided on the second conveyor 18B side. A support base 28 is provided between the loop-shaped conveyor belts 24a. Further, a pressure cylinder 29 having a piston 30 is provided above the conveyor belt 24a at a position corresponding to the support base 28. The pressure cylinder 29 has an inner diameter that can contain at least the plug 2 and opens toward the conveyor belt 24a. The opening is pressed against the conveyor belt 24a by lifting means (not shown). It is supposed to be.

  The pressurizing means 23 includes the relay conveyor 24, guide rails 26 and 27, a support base 28 and a pressurizing cylinder 29. Then, the stopper 2 transferred to the carbon dioxide container 21 and transferred from the first conveyor 18A to the relay conveyor 24, that is, onto the conveyor belt 24a, reaches a position corresponding to the pressure cylinder 29 by the conveyor belt 24a. At this time, the transfer device 19 including the relay conveyor 24 is temporarily stopped, the pressurizing cylinder 29 is lowered, the mouth plug 2 is contained, and the opening thereof is pressed against the conveyor belt 24a. In this state, the piston 30 is actuated and lowered to pressurize the carbon dioxide gas 20 in the pressurizing cylinder 29 containing the plug 2.

Next, a non-destructive airtightness determining method for a plug that is carried out using the nondestructive airtightness determining apparatus for a plug of the second example will be described.
First, the stopper 2 is transferred from the upper part of the carbon dioxide storage container 21 into the carbon dioxide storage container 21 by the first conveyor 18A of the conveyor 18 constituting the transfer device 19, and sent out to the relay conveyor 24, that is, the conveyor belt 24a. . When the plug 2 fed to the conveyor belt 24a reaches a position corresponding to the pressure cylinder 29, the transfer device 19 including the relay conveyor 24 is temporarily stopped, and the pressure cylinder 29 is lowered to lower the plug. 2 is pressed against the conveyor belt 24a. In this state, the piston 30 is actuated and lowered to pressurize the carbon dioxide gas 20 in the pressurizing cylinder 29 containing the plug 2.

  At this time, if the airtightness of the space 17 formed between the plug body 3 and the reseal lid 13 in the plug 2 is perfect, the carbon dioxide gas 20 does not enter the space 17, but the airtightness Is insufficient, the carbon dioxide gas 20 enters the space 17 in accordance with the degree of insufficiency. At this time, since the carbon dioxide gas 20 in the pressurizing cylinder 29 is in a pressurized state, the airtightness of the space 17 formed between the plug body 3 and the reseal lid 13 in the plug 2 is not good. When it is sufficient, the penetration of the carbon dioxide gas 20 into the space 17 is promoted, whereby the non-destructive airtightness determination of the plug can be performed in a short time.

  In this example, when the plug 2 is immersed in the pressurized carbon dioxide gas 20, it is generally sufficient to immerse the stopper 2 in the carbon dioxide gas 20 at 1 atm for 1 second. It can adjust suitably in the range of 0.3 to 10 seconds. If the pressure is less than 1 atm, it is the same as carbon dioxide immersion under non-pressurized conditions. Even in this case, the airtightness cannot be determined by the method of this example, but the determination efficiency is when the pressure is increased by 1 atm or more. It will be inferior to. If it exceeds 2 atmospheres, the load applied to the plug 2 is too large, and the plug 2 itself may be damaged. However, since the pressure resistance of the plug 2 varies depending on the structure, material, pressure treatment time, etc., this upper limit is not absolute. In addition, if the immersion time is shorter than 0.3 seconds, it is difficult to apply a predetermined atmospheric pressure, and the airtightness determination accuracy is poor. On the other hand, if the immersion time is long, the accuracy of determining the airtightness is increased. However, if the immersion time exceeds 10 seconds, the processing efficiency is too bad to be practical.

  The soaking time of the spigot 2 in this example can be set by changing the time for temporarily stopping the transfer device 19 including the relay conveyor 24, and the pressurization of the carbon dioxide gas 20 is performed by the piston 30 in the pressurizing cylinder 29. It can be set by changing the descending length.

  The plug 2 having been immersed in the carbon dioxide gas 20 as described above is transferred to the infrared detecting device 22 by the second conveyor 18B and passed through the measurement groove 22a. Then, in the same manner as in the first example, an infrared ray is irradiated toward the plug 2 passing through the measurement groove 22a so as to strike the space 17, the amount of infrared ray transmitted through the plug 2 is measured, and infrared absorption is performed. Find the rate. The determination of airtightness based on the obtained infrared absorption rate is the same as in the first example, so the description of the first example is used and the description thereof is omitted.

  In the carbon dioxide gas storage container 21 provided with the pressurizing means 23 for immersing the stopper 2 in the carbon dioxide gas 20 in a pressurized state in the present example, the pressure cylinder 29 and the piston 30 are added as described above. Although the pressure means 23 is configured to be installed in the carbon dioxide container 21, the present invention is not limited to this, and the plug 2 for determining airtightness may be immersed in the pressurized carbon dioxide 20. If possible, other formats, methods, and modes may be used.

  Four plugs A, B, C, and D were prepared in advance as the plugs 2 having the structure shown in FIG. Of the plugs A and B, the plug body 3 and the resealing lid body 13 are confirmed to be fitted in an airtight manner, and the plug C is intentionally operated by the resealing lid body 13. The plug D is loosened to reduce the airtightness, and the plug D is formed by screwing the plug main body 3 and the resealing lid 13 in the carbon dioxide gas storage container 21 having a concentration of 99%. By tightening the body 13 by hand, the spigot body 3 and the resealing lid body 13 are hermetically fitted, and the space 17 formed by the spigot body 3 and the resealing lid body 13 is concentrated. It is filled with 99% carbon dioxide gas 20.

With respect to these plugs A, B, C and D, the plugs B and C immediately after being immersed in carbon dioxide gas 20 having a concentration of 99% at 1.2 atm for 1 second, the plugs A and D are particularly carbon dioxide. No soaking treatment in 20, using a Fourier transform infrared spectrophotometer manufactured by HORIBA, infrared rays of 2100-2550 cm ⁻¹ are emitted every 1 nm from the outside of the plugs, and these plugs A, B, C, Irradiation was made so as to hit the space 17 formed by the D plug body 3 and the reseal lid 13, and the amount of transmitted infrared rays was measured.

Table 1 shows the amount of infrared rays absorbed as 100 when the plug D is irradiated with infrared rays of 2370 cm ⁻¹ .

A: Mouth with good airtightness without carbon dioxide immersion treatment B: Mouth with good airtightness with carbon dioxide immersion treatment C: Mouth with poor airtightness with carbon dioxide immersion treatment D: Main body 3 And the plug 17 in which the inside of the space 17 formed by the reseal lid 13 is filled with a concentration of 99%. Next, when the plug 7 is irradiated with infrared rays of 2370 cm ⁻¹ , it is absorbed while passing through it. A calibration curve of carbon dioxide concentration was prepared with the infrared ray amount set to 0, and the degree of airtightness was accurately determined using the data in Table 1. As a result, in the stopper B having good airtightness, the space formed by the stopper main body 3 and the resealing lid 13 is immersed in carbon dioxide gas 20 having a concentration of 99% at 1.2 atm for 1 second. The carbon dioxide gas concentration in 17 remained 0%, and the intrusion of carbon dioxide gas 20 was not recognized. However, in the mouthpiece C having poor airtightness, the mouthpiece body 3 and the resealing lid body were subjected to the same immersion treatment. The carbon dioxide gas concentration in the space 17 formed by No. 13 was 16.8%, and it was found that the carbon dioxide gas 20 entered the space 17.

It is a schematic block diagram which shows the 1st example of embodiment of the apparatus which implements the nondestructive airtight determination method of the stopper which concerns on this invention. It is an expansion perspective view which shows the relationship between a transfer apparatus and a stopper. It is a principal part perspective view which shows the 2nd example of embodiment of the apparatus which implements the nondestructive airtight determination method of the stopper concerning this invention. It is a perspective view of the conventional paper liquid container. It is an expanded sectional view of the stopper used for the conventional paper liquid container. It is a perspective view of the conventional liquid bottle container made from a thermoplastic resin. It is an expanded sectional view of the stopper used for the conventional liquid bottle container made from a thermoplastic resin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper liquid container 2 Port stopper 3 Port body 4 Outlet cylinder 5 Bulkhead 6 Ring cut 7 Pull ring 8 Strut 9 Inner wall 10 Flange 11 Screw thread 12 Screw groove 13 Reseal lid 14 Thermoplastic resin bottle container 15 Opening Section 16 Fixed Section 17 Space 18 Conveyor 18A First Conveyor 18B Second Conveyor 18a, 18b Conveyor Belt 19 Transfer Device 20 Carbon Dioxide 21 Carbon Dioxide Container 22 Infrared Detector 22a Measuring Groove 23 Pressurizing Means 24 Relay Conveyor 24a Conveyor Belt 25 Roll 26, 27 Guide rail 28 Support base 29 Pressure cylinder 30 Piston

Claims (5)

  The plug body is equipped with a resealing lid, and the mouthpiece having a space that is hermetically blocked from the outside between the plug body and the resealing lid is in a carbon dioxide gas with a higher concentration than normal air. A method for determining the non-destructive airtightness of a plug, characterized by performing a treatment of immersing in the plug and then measuring an infrared absorption rate of the space in the plug.   The method for determining the non-destructive airtightness of a plug according to claim 1, wherein the process of immersing the plug in the carbon dioxide gas is performed by pressurizing the carbon dioxide gas.   A transfer device for transferring a plug having a space that is hermetically blocked from outside between the plug main body and the reseal lid, and provided with a reseal lid on the plug main body; The carbon dioxide containing container that immerses the stopper in carbon dioxide having a higher concentration than the normal atmosphere, and the infrared absorption rate of the space in the stopper during the transfer of the stopper after immersion of the carbon dioxide gas. A nondestructive airtightness judging device for a plug, comprising an infrared detecting device for measurement.   The non-destructive airtightness judging device for a plug according to claim 3, wherein the carbon dioxide gas container is provided with a pressurizing means for pressurizing the carbon dioxide gas.   The pressurizing means is configured to pressurize the carbon dioxide gas in the cylinder by operating a piston by putting a cylinder on the stopper on a support base in the carbon dioxide gas in the carbon dioxide gas storage container. The non-destructive airtightness judging device for a mouthpiece according to claim 4.

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