JPH0737912B2 - Inspection method for leaks in nitrogen gas filled packages - Google Patents
Inspection method for leaks in nitrogen gas filled packagesInfo
- Publication number
- JPH0737912B2 JPH0737912B2 JP62237958A JP23795887A JPH0737912B2 JP H0737912 B2 JPH0737912 B2 JP H0737912B2 JP 62237958 A JP62237958 A JP 62237958A JP 23795887 A JP23795887 A JP 23795887A JP H0737912 B2 JPH0737912 B2 JP H0737912B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- package
- nitrogen gas
- leaks
- inspection method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims description 15
- 229910001873 dinitrogen Inorganic materials 0.000 title claims description 15
- 238000007689 inspection Methods 0.000 title claims description 14
- 238000000034 method Methods 0.000 title claims description 10
- 239000007789 gas Substances 0.000 claims description 38
- 238000001514 detection method Methods 0.000 claims description 20
- 239000001307 helium Substances 0.000 claims description 12
- 229910052734 helium Inorganic materials 0.000 claims description 12
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 12
- 239000000700 radioactive tracer Substances 0.000 claims description 9
- 230000007547 defect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
- G01M3/227—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators for flexible or elastic containers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Packages (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、内容物の酸化防止等の目的でガスを充填した
包装体において、ピンホールやシール不良等を知るため
これらからのガスのリークを検査するための方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a package filled with gas for the purpose of preventing oxidation of the contents and the like, in order to know pinholes, seal defects, etc., gas leaks from these. For a method for inspecting.
（従来の技術及びその問題点） 従来このようなリークの検査は、減圧チャンバーに包装
体を置き該チャンバーを密封してその後の圧力上昇によ
り検出していた。(Prior Art and Problems Thereof) Conventionally, such leak inspection has been performed by placing a package in a decompression chamber, sealing the chamber, and then detecting the increase in pressure.
このような検査方法では包装体の生産ラインの速度が早
いことに較べ非常に時間がかかるため、全体の生産能率
を低下させ、また生産能率を重要視するとごく一部の抜
き取り検査しか出来ない不完全なものとなるという欠点
があった。Since such an inspection method takes much time compared to the speed of the packaging production line, it lowers the overall production efficiency, and if the production efficiency is important, only a part of the sampling inspection can be performed. It had the drawback of being perfect.
より短時間で行うことが可能な方法としては、包装体の
中に特定のガスを封入し、その包装体を押しつぶして包
装体に欠陥があるときに中のガスが強制的に押し出され
るようになし、この押し出されたガスを前述した特定の
ガスの存在を知ることのできる検知装置に導くことが知
られている。しかしながら、かかる方法によると、特定
のガスを検知する能力を備えるために、例えば赤外線検
知機を必要とする等、検知装置は複雑なものとなり、設
備のコストの面で望ましくない。As a method that can be performed in a shorter time, enclose a specific gas in the package and crush the package so that the gas inside is forced out when there is a defect in the package. None, it is known to guide this extruded gas to a sensing device that can detect the presence of the particular gas described above. However, according to such a method, the detection device becomes complicated, for example, an infrared detector is required in order to have the ability to detect a specific gas, which is not desirable in terms of equipment cost.
本発明の目的は、かかる欠点のない、オンライン操作の
可能な検査方法を提供することにある。An object of the present invention is to provide an inspection method that can be operated online without such drawbacks.
（問題点を解決するための手段） 本発明においては、窒素ガスを充填した包装体では窒素
ガスが空気とほとんど同じ熱伝導率を有するため、窒素
ガスとは熱伝導率の異なるトレーサーガスを封入して包
装体の内部の気体の熱伝導率が空気と異なるようにし、
該包装体をコンベアにより移送し、移送の間に該包装体
を強制的に加圧して包装体に欠陥がある場合に内部の気
体がリークするようになし、通電される少なくとも２つ
の抵抗体を備えた検知回路を有した検知装置の一方の抵
抗体に基準とする通常の空気が供給され他方の抵抗体に
リークした気体が混入した空気が供給されるように検知
装置を介して気体の吸引を行い、２つの抵抗体に供給さ
れる気体の熱伝導率の差により生じるこれらの抵抗値変
化の差によりトレーサーガスの存在を検知するようにし
て、上記問題を解決した。(Means for Solving Problems) In the present invention, since nitrogen gas has almost the same thermal conductivity as air in a package filled with nitrogen gas, a tracer gas having a thermal conductivity different from that of nitrogen gas is enclosed. So that the thermal conductivity of the gas inside the package is different from that of air,
The package is transferred by a conveyor, and during transfer, the package is forcibly pressed so that the gas inside is leaked when the package has a defect, and at least two resistors are energized. Suction of gas through the detection device so that the normal air as the reference is supplied to one resistor of the detection device having the detection circuit provided and the air containing the leaked gas is supplied to the other resistor. In order to solve the above problem, the presence of the tracer gas is detected by the difference in the change in the resistance values caused by the difference in the thermal conductivity of the gas supplied to the two resistors.
（実施例） 第１図は本発明による検査方法を実施するための装置の
１つの例の構成説明図であり、ここで１はコンベアであ
り、これによって包装体２が所定の間隔で連続的に製造
場所より送られてくる。検査位置にはフード３が設けら
れていて、その内側にはアーム４が固定されている。ア
ームの下端には押圧装置として機能するローラ５が設け
られていて、該ローラにより包装体を押圧する。アーム
４はフード３に揺動可能に取り付け包装体に向けばねで
引きつけるようにしてもよい。(Embodiment) FIG. 1 is a structural explanatory view of an example of an apparatus for carrying out the inspection method according to the present invention, in which 1 is a conveyor, whereby the package 2 is continuously arranged at predetermined intervals. Will be sent from the manufacturing site. A hood 3 is provided at the inspection position, and an arm 4 is fixed inside the hood 3. A roller 5 that functions as a pressing device is provided at the lower end of the arm, and the roller presses the package. The arm 4 may be swingably attached to the hood 3 and may be attracted by a spring toward the package.
フード３の下流にはリジェクター６が設けられており後
述するリークの信号を受けると該当する包装体をライン
から取り除く。A rejector 6 is provided downstream of the hood 3, and when a leak signal described later is received, the corresponding package is removed from the line.
ローラ５の近傍まで吸引チューブ７が延びており、該チ
ューブはフード３を貫通しガス検知装置８を経由し吸引
ポンプ９まで延びている。さらにフード３の外部に開口
する参照チューブ11が同じくガス検知装置８を経由し吸
引ポンプにまで達している。これらチューブ７、11の途
中にはフィルター12、流量制御装置13及び流量表示器14
がそれぞれ設けられている。A suction tube 7 extends to the vicinity of the roller 5, and the tube extends through the hood 3 and a gas detection device 8 to a suction pump 9. Further, a reference tube 11 opening to the outside of the hood 3 also reaches the suction pump via the gas detection device 8. A filter 12, a flow rate controller 13 and a flow rate indicator 14 are provided in the middle of the tubes 7 and 11.
Are provided respectively.
図示の実施例では包装体２は窒素ガスを充填されてい
る。そしてこの窒素ガスは空気中に多量に存在するため
そのままではリークの検知が困難なためトレーサーガス
としてヘリウムが混入してある。連続的に送られて来た
包装体２がローラ５によって押しつぶされると、ピンホ
ールやシールの不完全部があればガスのリークが生じ
る。このリークしたガスは吸引チューブによってガス検
知装置８まで運ばれここでヘリウムの検出が行われて、
ヘリウムが存在すればリークが検出できる。ガス検知装
置８はヘリウムを検出すると、リーク信号をリジェクタ
ー６に送り、リジェクター６は該当する包装体をライン
から取り除く。In the illustrated embodiment, the package 2 is filled with nitrogen gas. Since a large amount of this nitrogen gas is present in the air, it is difficult to detect the leak as it is, so helium is mixed as a tracer gas. When the package 2 that has been continuously sent is crushed by the roller 5, if there is a pinhole or an incomplete portion of the seal, gas leakage occurs. The leaked gas is conveyed to the gas detection device 8 by the suction tube, where helium is detected,
Leaks can be detected if helium is present. When the gas detector 8 detects helium, it sends a leak signal to the rejector 6, and the rejector 6 removes the corresponding package from the line.
ヘリウムの検出のための検査機は種々あるが、本発明で
は検知装置８の構成を簡単なものとすることができる新
規な方法を用いている。Although there are various inspection machines for detecting helium, the present invention uses a novel method that can simplify the structure of the detection device 8.
第２図は第１図の実施例で用いたガス検知装置の原理図
で、Ｓは電源、Ｂはブリッジである。ブリッジの相対す
る辺の抵抗は第１及び第２の検出セル21、22によって囲
まれており、第１の検出セルは参照チューブ11に第２の
検出セルは吸引チューブ７に各々接続している。吸引チ
ューブを通るガスにヘリウムが存在すると、ヘリウムは
高い熱伝導率を有するため第２の検出セル内の抵抗の冷
却の度合いが高くなりブリッジの出力部23の電圧が変化
しヘリウムの存在が検出できる。ちなみに、窒素ガスの
熱伝導率は5.81×10-5［Cal/cm・sec・℃］であり空気
との差がほとんどなく窒素ガスのみではその漏れを検出
することは不可能であるのに対し、ヘリウムのそれは 34.8×10-5と大きくそれが混入した窒素ガスは熱伝導率
が大きくなり上述のごとき大気との比較による測定が可
能となる。FIG. 2 is a principle diagram of the gas detection device used in the embodiment of FIG. 1, where S is a power source and B is a bridge. The resistances of the opposite sides of the bridge are surrounded by the first and second detection cells 21, 22, the first detection cell being connected to the reference tube 11 and the second detection cell being connected to the suction tube 7, respectively. . When helium is present in the gas passing through the suction tube, helium has a high thermal conductivity, so the degree of cooling of the resistance in the second detection cell is increased, and the voltage at the output 23 of the bridge is changed to detect the presence of helium. it can. By the way, the thermal conductivity of nitrogen gas is 5.81 × 10 -5 [Cal / cm ・ sec ・ ° C], which is almost the same as that of air, and it is impossible to detect the leak only with nitrogen gas. , That of helium is as large as 34.8 × 10 -5, and the nitrogen gas with which it is mixed has a large thermal conductivity, which allows measurement by comparison with the atmosphere as described above.
第３図及び第４図は第１図に示す装置でコンベアを停め
た状態で検査位置に包装体を置き手動の装置で包装体を
押しつぶしその際のブリッジ出力部の電圧の変化を見た
もので、押しつぶしによりリークした窒素ガス内のヘリ
ウムが検出できることが確認できた。FIGS. 3 and 4 show changes in the voltage of the bridge output section when the package is placed at the inspection position with the conveyor stopped by the device shown in FIG. 1 and the package is crushed by a manual device. It was confirmed that the helium in the nitrogen gas leaked by the crushing could be detected.
第５図は検査位置の変形例を示すもので、この例では吸
引チューブ7aはフード3aの内部全体からガスを吸引する
ようになっている。この例では、ローラ5aは前後に設け
られ各々ばね25により下向きに押圧されている。FIG. 5 shows a modification of the inspection position. In this example, the suction tube 7a sucks gas from the entire inside of the hood 3a. In this example, the rollers 5a are provided at the front and rear and are pressed downward by the springs 25, respectively.
第６図は検査位置の他の変形例を示すもので、ここでは
吸引チューブ7bはその先端が多数の分岐管26となってお
りこれらが前方に向け曲げられており、包装体2bが送ら
れて来るとこれら分岐管のカム作用により自動的に押し
つぶされてかつそのためにリークしたガスは包装体2bに
密着した分岐管により吸引されるようになっている。こ
の例ではフードは省略できる。FIG. 6 shows another modification of the inspection position, in which the suction tube 7b has a plurality of branch tubes 26 at its tip, which are bent forward, and the package 2b is sent. When coming, the gas that is automatically crushed by the cam action of these branch pipes and leaks therefor is sucked by the branch pipe that is in close contact with the package 2b. In this example, the hood can be omitted.
以上、窒素ガスにトレーサーガスとしてヘリウムを混入
する例について述べたが、トレーサーガスは水素ガスそ
の他のガスとすることもできる。The example in which helium is mixed as the tracer gas in the nitrogen gas has been described above, but the tracer gas may be hydrogen gas or another gas.
（発明の効果） 上述のように本発明では、包装体を押しつぶして積極的
にガスをリークさせこれを検出するようにしたのみなら
ず、空気とトレーサーガスとの熱伝導率の差により検知
を行うようにしたため、窒素ガスを充填した包装体に、
設備は簡単なものとすることができ、また検知が短時間
で可能となり、ピンホールやシール部不良等がオンライ
ンで検査できるようになった。(Effects of the Invention) As described above, in the present invention, not only is the package crushed to positively leak gas to detect this, but detection is also performed by the difference in thermal conductivity between air and tracer gas. Since it was done, in the package filled with nitrogen gas,
The equipment can be simple, detection is possible in a short time, and pinholes and defective seals can be inspected online.
第１図は本発明の１つの実施例の構成説明図；第２図は
第１図の実施例に用いられたガス検知装置の検知原理を
示す回路図；第３図及び第４図は第２図の回路の出力部
の電圧のグラフ；第５図は検査位置の変形例を示す構成
説明図；第６図は検査位置のさらに他の変形例を示す斜
視図である。 １……コンベア、２……包装体、 ５……押圧装置のローラ、 ７……吸引チューブ、 ８……検知装置FIG. 1 is a structural explanatory view of one embodiment of the present invention; FIG. 2 is a circuit diagram showing the detection principle of the gas detection device used in the embodiment of FIG. 1, and FIG. 3 and FIG. FIG. 5 is a configuration diagram showing a modified example of the inspection position; FIG. 6 is a perspective view showing still another modified example of the inspection position. 1 ... Conveyor, 2 ... Package, 5 ... Pressing device roller, 7 ... Suction tube, 8 ... Detecting device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 酒向 淳 東京都千代田区西神田２―２―５ ヨコタ ビル 日本計測工業株式会社内 (72)発明者 鈴木 浩 東京都千代田区西神田２―２―５ ヨコタ ビル 日本計測工業株式会社内 (56)参考文献 特開 昭47−32882（ＪＰ，Ａ) 特開 昭62−96838（ＪＰ，Ａ) 特公 昭51−23920（ＪＰ，Ｂ１) 米国特許第3091114（ＵＳ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Sako 2-2-5 Nishikanda, Chiyoda-ku, Tokyo Yokota Building Nihon Keisoku Kogyo Co., Ltd. (72) Inventor Hiroshi Suzuki 2-2 Nishikanda, Chiyoda-ku, Tokyo -5 Yokota Building within Nippon Keizai Kogyo Co., Ltd. (56) Reference JP-A-47-32882 (JP, A) JP-A-62-96838 (JP, A) JP-B-51-23920 (JP, B1) US Patent No. 3091114 (US, A)
Claims (2)
は熱伝導率の異なるトレーサーガスを封入し、該包装体
をコンベアにより移送し、移送の間に該包装体を強制的
に加圧して包装体に欠陥がある場合に内部の気体がリー
クするようになし、通電される少なくとも２つの抵抗体
を備えた検知回路を有した検知装置の一方の抵抗体に基
準とする通常の空気が供給され他方の抵抗体に前記リー
クした気体が混入した空気が供給されるように前記検知
装置を介して気体の吸引を行い、２つの抵抗体に供給さ
れる気体の熱伝導率の差により生じるこれらの抵抗値変
化の差によりトレーサーガスの存在を検知するようにし
た、窒素ガス充填包装体におけるリークの検査方法。1. A package filled with nitrogen gas is filled with a tracer gas having a thermal conductivity different from that of nitrogen gas, the package is transported by a conveyor, and the package is forcibly added during the transport. Normal air as a reference to one resistor of a detection device having a detection circuit having at least two resistors to be energized so that the gas inside leaks when the package has a defect. Is supplied to the other resistor and the air mixed with the leaked gas is supplied to the other resistor, the gas is sucked through the detection device, and the difference in the thermal conductivity of the gas supplied to the two resistors causes A method for inspecting a leak in a nitrogen gas-filled package, wherein the presence of a tracer gas is detected based on the difference in these resistance changes.
記トレーサーガスはヘリウムである検査方法。2. The inspection method according to claim 1, wherein the tracer gas is helium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62237958A JPH0737912B2 (en) | 1987-09-22 | 1987-09-22 | Inspection method for leaks in nitrogen gas filled packages |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62237958A JPH0737912B2 (en) | 1987-09-22 | 1987-09-22 | Inspection method for leaks in nitrogen gas filled packages |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6479635A JPS6479635A (en) | 1989-03-24 |
| JPH0737912B2 true JPH0737912B2 (en) | 1995-04-26 |
Family
ID=17022986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62237958A Expired - Lifetime JPH0737912B2 (en) | 1987-09-22 | 1987-09-22 | Inspection method for leaks in nitrogen gas filled packages |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0737912B2 (en) |
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| US5499529A (en) * | 1993-06-02 | 1996-03-19 | The United States Of America As Represented By The United States Department Of Energy | Detecting small holes in packages |
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| JP5073198B2 (en) * | 2005-11-28 | 2012-11-14 | キョーラク株式会社 | Pinhole inspection method for blow molded products |
| DE102007046654B4 (en) * | 2007-09-28 | 2012-01-26 | Evonik Carbon Black Gmbh | Apparatus and method for determining the tightness of filled packages |
| JP5571038B2 (en) * | 2011-07-04 | 2014-08-13 | 越後製菓株式会社 | Packaging |
| GB2493009A (en) * | 2011-07-21 | 2013-01-23 | Packtester Ltd | Seal integrity detector for sealed packages |
| JP2015194362A (en) * | 2014-03-31 | 2015-11-05 | 株式会社北村鉄工所 | Pinhole inspection method and pinhole inspection apparatus for gas-filled and hermetically sealed packed food |
| CN109655212B (en) * | 2018-12-17 | 2021-06-04 | 兰州空间技术物理研究所 | A metal extrusion seal leak rate detection device and method |
| JP2022016117A (en) * | 2020-07-10 | 2022-01-21 | 大森機械工業株式会社 | Packaging machine and packaging method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3091114A (en) | 1959-12-17 | 1963-05-28 | Air Reduction | Method and apparatus for testing sealed packages for leaks |
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- 1987-09-22 JP JP62237958A patent/JPH0737912B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3091114A (en) | 1959-12-17 | 1963-05-28 | Air Reduction | Method and apparatus for testing sealed packages for leaks |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012514743A (en) * | 2009-01-08 | 2012-06-28 | インフィコン ゲゼルシャフト ミット ベシュレンクテル ハフツング | Leak detection method |
| JP2014215070A (en) * | 2013-04-23 | 2014-11-17 | 高千穂精機株式会社 | Sealed packaging bag airtight leakage inspection device |
| WO2017191465A3 (en) * | 2016-05-06 | 2017-12-21 | Ishida Europe Limited | Container leak detection |
| US10690564B2 (en) | 2016-05-06 | 2020-06-23 | Ishida Europe Limited | Container leak detection |
| RU2738787C2 (en) * | 2016-05-06 | 2020-12-16 | Ишида Юроп Лимитед | Detection of leaks in container |
| EP4024023A1 (en) * | 2016-05-06 | 2022-07-06 | Ishida Europe Limited | Container leak detection |
| EP3795973B1 (en) * | 2019-09-17 | 2025-10-29 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Method and device for detecting a sealing fault in packaging |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6479635A (en) | 1989-03-24 |
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