EP2780683A2 - Détection rapide de fuites sur des emballages rigides/souples sans ajout de gaz de test - Google Patents

Détection rapide de fuites sur des emballages rigides/souples sans ajout de gaz de test

Info

Publication number
EP2780683A2
EP2780683A2 EP12788144.9A EP12788144A EP2780683A2 EP 2780683 A2 EP2780683 A2 EP 2780683A2 EP 12788144 A EP12788144 A EP 12788144A EP 2780683 A2 EP2780683 A2 EP 2780683A2
Authority
EP
European Patent Office
Prior art keywords
chamber
test
test chamber
pressure
total pressure
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.)
Ceased
Application number
EP12788144.9A
Other languages
German (de)
English (en)
Inventor
Silvio Decker
Daniel Wetzig
Hjalmar Bruhns
Stefan Mebus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inficon GmbH Deutschland
Original Assignee
Inficon GmbH Deutschland
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Inficon GmbH Deutschland filed Critical Inficon GmbH Deutschland
Publication of EP2780683A2 publication Critical patent/EP2780683A2/fr
Ceased legal-status Critical Current

Links

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
    • 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
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
    • G01M3/3218—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators for flexible or elastic containers
    • 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
    • G01M3/027—Details with respect to the testing of elastic elements, e.g. gloves, condoms
    • 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
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
    • G01M3/3281—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators removably mounted in a test cell

Definitions

  • the invention relates to a device for leak detection on a test specimen.
  • leaks in a specimen are measured by placing the specimen in a rigid test chamber.
  • the test chamber is then evacuated and measured the pressure profile in the chamber after disconnecting the chamber from the pump. If the test piece has a leak, gas escapes from the test piece into the chamber, which increases the pressure in the test chamber. The pressure increase is measured and serves as an indication of a leak of the test object.
  • the pressure within the test chamber is not affected solely by leakage in the test chamber It is also affected by temperature changes in the test chamber or by desorption of gases on inside surfaces of the test chamber, which results in measurement errors in the leak detection. These disturbing influences are greater, the larger the volume of the test chamber and the greater the pressure during the measurement within the test chamber.
  • the volume of the test chamber can not be arbitrarily reduced, because the shape, size and number of specimens require a specific chamber volume.
  • the pressure during the measurement within the test chamber can not be arbitrarily reduced because of the risk of deformation, damage or even bursting of the test object, in particular in the case of soft, low-dimensional test objects such as, for example, packaging.
  • test chambers in which at least one wall region and preferably the entire test chamber consists of a flexible, preferably elastically deformable material, such as a film.
  • the flexible wall region is formed in the region of the chamber in which the test object is located during the leakage measurement.
  • the flexible chamber wall conforms to the DUT, thereby reducing the chamber volume.
  • the flexible wall area which conforms to the test object, supports the test object and prevents deformation or even bursting of the test object. This is particularly in the case of weak DUT from a soft material, such as packaging, advantage.
  • Such film test chambers are described, for example, in JP-A 62-112027, EP 0 152 981 A1 and EP 0 741 288 B1.
  • JP-A 62-112027 describes detecting the escaping gas with a gas detector.
  • EP 0 152 981 AI describes an evacuation of the film chamber, wherein the pressure difference between the pressure in the film chamber and a Reference pressure within a reference volume is considered. If this pressure difference deviates from zero, a leak is considered to be detected.
  • EP 0 741 288 B1 a film chamber is pressurized and the leak pressure is measured at a certain point in time. If a threshold is exceeded, a leak is considered detected.
  • the invention has for its object to provide a device for leak detection on a specimen, which allows rapid leak detection.
  • the device according to the invention is defined by the features of claim 1.
  • the leakage detection is performed by measuring the total pressure rise of the pressure within the test chamber.
  • the test for possible leaks takes place without the aid of test gas. Direct gas exchange between the test chamber and the total pressure sensor is not necessary in this case, so that no gas has to flow from the leakage to the pressure sensor.
  • Total pressure is the absolute pressure within the film test chamber.
  • the term total pressure here serves to differentiate the known from the prior art leakage detection by evaluation of a differential pressure.
  • the shape of the pressure rise curve serves for a quick assessment of whether a leak exists.
  • the course of the pressure increase is more accurate than merely monitoring threshold values or measuring differential pressures.
  • the rapid evaluation of the course of the total pressure rise enables a fully automated and particularly fast measuring cycle for use in fully automated leak tests.
  • the test chamber consists of one or more flexible films into or between which the test object is introduced.
  • the foil or the foils can be interconnected and closed by clamping elements such as brackets.
  • a gas-permeable material or a gas-permeable structure on an inner wall portion of the test chamber in the region of the specimen allows gas flow around the specimen, even after nestling the flexible test chamber wall to the specimen, thereby allowing further evacuation of the entire chamber volume to a low total pressure.
  • the pressure profile i. E. the course of the total pressure and possibly also the course of the partial pressure of individual gas components, already evaluated during the pumping phase of the measurement sequence to allow a Gro ⁇ ckerkennung.
  • test chamber is enclosed by an external overpressure chamber.
  • the pressure within the outer chamber may be increased from the pressure within the test chamber such that an external force is applied to the flexible test chamber and the flexible portion of the test chamber nestles against the product.
  • a large part of the gas from the test chamber is pressed regardless of the pumping speed of a pump used.
  • the measuring cycle is considerably faster.
  • a selectively gas-binding material is introduced as an absorber into the test chamber or into a volume connected to the test chamber volume.
  • the absorber material binds reactive gas, which could affect the pressure rise in the chamber by desorption and distort the leak rate measurement.
  • Desorption of gases on the surfaces of the test chamber interior sides typically causes an additional pressure increase and leads to measurement errors in the leak rate measurement.
  • water in a pressure range of less than 10 mbar makes a significant contribution to the increase in total pressure due to desorption.
  • the one of the Water desorption caused pressure rise in the test chamber can not be distinguished from the pressure increase by a leak of the test specimen in a total pressure measurement.
  • the absorber material can reduce this measurement error.
  • the absorber material is accommodated in a connection channel between the test chamber and a pressure sensor, for example the total pressure sensor.
  • a pressure sensor for example the total pressure sensor.
  • the volume within the connecting channel, in which the absorber material is located should be able to be separated from the test chamber volume by a shut-off valve.
  • the absorber material is not exposed to the atmospheric gas when the valve is locked and the capacity of the absorber material for selective gas binding is spared.
  • Fig. 2 is a schematic representation of the test chamber of the first
  • FIG. 3 is the view of Fig. 2 of a second embodiment
  • FIG. 4 shows the view according to FIG. 2 of a third exemplary embodiment
  • FIG. 5 shows the view according to FIG. 2 of a fourth exemplary embodiment
  • Fig. 7 is an example of an evaluation of the pressure rise to set
  • the test piece 12 is introduced into the chamber 14. Thereafter, the chamber 14 is closed and evacuated via a valve 26. Due to the pressure drop in the chamber 14 and the associated external force exerted by the air pressure, the flexible chamber wall 16 completely nestles around the specimen 12 and adapts to its outer shape.
  • the chamber foil 16 and the test piece 12 there is a gas-permeable material made of a fleece 20.
  • the surface of the foils 16 can be structured. This allows the flow of gas around the specimen 12 even after nestling the film chamber 14 to the specimen 12, thus allowing further evacuation of the entire chamber volume to low total pressure.
  • a vacuum is formed, typically in the range of 1 to 50 mbar absolute pressure, which corresponds to the chamber pressure of a rigid test chamber.
  • the film 16 thus supports the packaging evenly from all sides and prevents swelling or destruction thereof.
  • the space filled with fleece 20 forms the free volume, which is typically only a few cm 3 . Due to the shape adaptation of the film chamber 14 to the specimen 12, the minimum chamber volume is achieved even with changing specimens.
  • Both the total pressure and the partial pressure increase in the measuring chamber depend on two variables: the existing chamber pressure and the measuring volume.
  • a sensor system specializing in specific test gas has a principle-dependent diffusion-dependent response time, since the test gas to be detected must pass from the leakage to the sensor in order to be detected. Depending on the distance and total pressure, the diffusion time may be unacceptable for the target cycle times.
  • the pressure rise due to temperature change would be twice as large as that caused by the leakage. If one were to work at 7 mbar instead, the pressure change due to the temperature change would be only 0.01 mbar, which corresponds to a proportion of only ⁇ 5% of the still the same measurement signal. This means that the same leak, which is covered by the temperature change at 700 mbar total pressure, can be measured at 7 mbar.
  • the thermal expansion caused by a temperature drift and concomitant change in the chamber volume can be neglected compared with the direct influence of a temperature change on the chamber pressure.
  • Temperature changes are expected during a leak measurement because on the one hand the pressure change and concomitant compression / expansion of the gas leads to changes in temperature and on the other hand, the specimens often have a different temperature compared to the measuring chamber.
  • the pressure change which is caused by leaks in the specimen, is greater the smaller the free chamber volume - and thus the measuring volume - is.
  • the free chamber volume is that volume which is not taken by the candidate in the evacuated state of the chamber.
  • Example: A leak of size q lxlO "3 mbar l / s causes a pressure increase of about 0.01 mbar within 10 s in a typical chamber with a free volume of one liter, with a free chamber volume of 10 cm 3 about 1 mbar.
  • the lowest possible chamber volume should be aimed for.
  • This contradiction can be solved by eliminating the influence of the water partial pressure by introducing an absorber material preferably in a connecting channel between the test chamber and the total pressure gauge.
  • the special feature of the invention is that a chamber made of a moldable and flexible, z. B. elastic material is used, the total pressure increase is used in such a sealed chamber for measuring the leakage.
  • the measurement of the total pressure is carried out by the measurement of the applied force per area, z. B. with a capacitive total pressure sensor.
  • the test for possible leaks takes place without the aid of test gas.
  • a direct gas exchange between the film chamber and the total pressure sensor is not necessary.
  • the test chamber itself can consist of a single or multiple slides.
  • the special feature of this measurement method is that the contradiction between the smallest volume and the lowest working pressure is achieved with simultaneous protection of the test object.
  • due to the detection by total pressure measurement a delivery of gas from leak to sensor is not necessary
  • a test piece 12 is brought in the form of a soft food packaging in a test chamber 14, which consists of a film 16.
  • Die fürsch 12 ist in der für Tropsch 14 in kann für für Tropsch 14 anally.
  • the film 16 consists, as shown in FIG. 2, from two separate film sections, between which the specimen 12 is placed, so that the specimen 12 is completely enclosed by two film parts.
  • Fig. 1 shows that the superimposed edge regions of the two film sections are pressed against each other with clamps 18, so that no gas can escape from the test chamber 14 between the film sections.
  • a surrounding the test piece 12 layer of a nonwoven On the inside of the film 16 is a surrounding the test piece 12 layer of a nonwoven, which allows a gas flow between the test piece 12 and film 16 in order to achieve a complete evacuation of the test chamber 14 even with closely fitting to the test piece 12 slide 16 can.
  • the test chamber 14 is connected via a connecting channel 22 to a vacuum pump 24.
  • a shut-off valve 26 for separating the für Biological Vapor Pump 24.
  • a vent valve 28 for venting the test chamber 14 is provided.
  • a further connecting channel 30 which connects the test chamber volume with the pressure sensor of a total pressure measuring device 32.
  • an absorber 34 and between the absorber 34 and the test chamber 14, a check valve 36 is provided in the connecting channel 30, an absorber 34 and between the absorber 34 and the test chamber 14, a check valve 36 is provided.
  • the shut-off valve 36 When the shut-off valve 36 is open, the absorber material of the absorber 34 is connected to the test chamber volume.
  • the absorber material is preferably made of water-absorbent zeolite to reduce the effect of water desorption on the inner wall portions of the test chamber 14.
  • the shut-off valve 36 is closed in order to preserve the absorption capacity of the absorber 34.
  • Fig. 3 shows an embodiment in which the test chamber 14 is formed from a folded film.
  • the test chamber 14 is closed by folding the film 16 around the specimen 12 around.
  • the film 16 is a hose which is closed at opposite ends to form the test chamber 14.
  • the test chamber 14 is formed from a film 16 in the form of a bag-like balloon, in which the test object 12 is contained.
  • the open end of the balloon may be closed to close the test chamber 14 with, for example, clamps 18 as in FIG.
  • FIG. 6 shows two curves of a pressure curve in the film chamber during a measuring interval of 10 s.
  • the dashed curve is that of a dense test specimen and the solid curve is that of a leaky specimen.
  • the pressure increase over the entire measuring interval for dense specimens may be greater than for leaky specimens.
  • the pressure increase at a certain time i. H . So the first derivative of the pressure curve over time, be denser for dense samples than for leaking. The reason for this is a different degree of desorption of gases from the film material or from the fleece. Under these conditions, it is possible that a single value, such.
  • the pressure increase or the total pressure difference between the beginning and end of the measurement interval no clear assignment for dense and leaky specimens supplies. This problem can be solved by a pattern recognition, which is based on different curve characteristics, such. B. the rise or the curvature at certain times, resorting.
  • Fig. 7 values for the pressure increase are plotted after 10 s (end of the measuring interval) and for the pressure increase after 5 s (half the measuring interval). On the x-axis, the pressure increase values are shown after half the measurement interval (5 s), and on the y-axis, the pressure increase values are plotted at the end of the measurement interval (10 s).
  • a pattern recognition should recognize groupings of the measured values. This is a first group for as crosses Measured values for the leaking test specimen and a second group for the dotted measured values of the dense specimen are recognized.
  • the dashed line in Fig. 7 represents the values of a DUT classified as dense.
  • the solid line represents the group of a test piece classified as leaking.
  • mathematical methods of pattern recognition such as LDA (Linear Discriminant Analysis) can be used.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

L'invention concerne un dispositif de détection de fuites sur un échantillon testé (12), comprenant une chambre de test (14) destinée à l'échantillon (12) et dans laquelle il est possible de faire le vide, ladite chambre de test comportant au moins une zone de paroi constituée d'un matériau flexible, en particulier élastique. Pour une détection précise des fuites, l'augmentation de la pression totale à l'intérieur de la chambre de test est mesurée.
EP12788144.9A 2011-11-16 2012-10-25 Détection rapide de fuites sur des emballages rigides/souples sans ajout de gaz de test Ceased EP2780683A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011086486.5A DE102011086486B4 (de) 2011-11-16 2011-11-16 Vorrichtung und Verfahren zur schnellen Lecksuche an formsteifen/schlaffen Verpackungen ohne Zusatz von Prüfgas
PCT/EP2012/071133 WO2013072173A2 (fr) 2011-11-16 2012-10-25 Détection rapide de fuites sur des emballages rigides/souples sans ajout de gaz de test

Publications (1)

Publication Number Publication Date
EP2780683A2 true EP2780683A2 (fr) 2014-09-24

Family

ID=47215504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12788144.9A Ceased EP2780683A2 (fr) 2011-11-16 2012-10-25 Détection rapide de fuites sur des emballages rigides/souples sans ajout de gaz de test

Country Status (10)

Country Link
US (1) US20140311222A1 (fr)
EP (1) EP2780683A2 (fr)
JP (1) JP6457813B2 (fr)
CN (1) CN104040317B (fr)
BR (1) BR112014011837B1 (fr)
DE (1) DE102011086486B4 (fr)
IN (1) IN2014MN00885A (fr)
MX (1) MX345986B (fr)
RU (1) RU2620871C2 (fr)
WO (1) WO2013072173A2 (fr)

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Also Published As

Publication number Publication date
RU2620871C2 (ru) 2017-05-30
WO2013072173A2 (fr) 2013-05-23
JP2014533825A (ja) 2014-12-15
IN2014MN00885A (fr) 2015-04-17
WO2013072173A3 (fr) 2013-08-22
CN104040317B (zh) 2018-03-13
DE102011086486B4 (de) 2023-01-19
BR112014011837B1 (pt) 2020-11-17
MX345986B (es) 2017-03-01
RU2014123988A (ru) 2015-12-27
DE102011086486A1 (de) 2013-05-16
US20140311222A1 (en) 2014-10-23
MX2014005791A (es) 2014-05-30
CN104040317A (zh) 2014-09-10
JP6457813B2 (ja) 2019-01-23
BR112014011837A2 (pt) 2017-05-09

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