CN1948960A - Method of monitoring packaging material defect contg. metallic foil using circulating voltammetry - Google Patents
Method of monitoring packaging material defect contg. metallic foil using circulating voltammetry Download PDFInfo
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- CN1948960A CN1948960A CN 200510112628 CN200510112628A CN1948960A CN 1948960 A CN1948960 A CN 1948960A CN 200510112628 CN200510112628 CN 200510112628 CN 200510112628 A CN200510112628 A CN 200510112628A CN 1948960 A CN1948960 A CN 1948960A
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Abstract
The invention relates to method used cyclic voltammetry to detect metal foil packing timber defect. It includes the following steps: putting one packaging bag into electrolytic bath; filling electrolyte into the packaging bag; putting one electrode into the electrolytic bath, another electrode into electrolytic bath outer the packaging bag; applying variable voltage to measure induced current, judge whether the packaging is true defect or not. The invention can be used to detect food package fake defect which can not be detected by common electrolytic testing method.
Description
Technical field
The relevant a kind of method of utilizing the packing timber defective of cyclic voltammetry detecting containing metal paper tinsel of the present invention, the method for the Artifact that the known mat electrolytic trial of especially relevant a kind of mat cyclic voltammetry detecting can't detect.
Background technology
Aseptic packaging is one of most important packaging type in food industry esp milk and the cold drink product.The most important functions of aseptic packaging is between the storage life, protects this product through sterilization to avoid being subjected to microbial contamination.Cause in the factor of packaging product deterioration, piercing through caused pin hole by bad encapsulation and/or machinery is most important factor, and it may cause that product is subjected to microbial contamination.Therefore, the inspection technology to pin hole is the Shu that makes the most important technology of aseptic packaging product.
Since past, the sound wave developing technique has been used for the defective on the non-destructive detecting flexible packaging, referring to A.Ozguler, S.A.Morris, W.D.O ' Brien Jr., use the defective of ultrasound wave contrast describer assessment packaging for foodstuff, packing technique science (Packag.Technol.Sci.) 12 (1999) 161-171; A.A.Safvi, H.J.Meerbaum, S.A.Morris, C.L.Harper, W.D.O ' Brien Jr., the sound wave of defective develops in flexible packaging, J.Food Prot.60 (1997) 309-314; A.Ozguler, S.A.Morris, W.D.O ' Brien Jr., the ultrasound wave that mat pulse back trace technique little seepage and sealing in soft packaging for foodstuff are polluted develops Food Science periodical (J.Food Sci) .63 (1998) 673-678; Z.Anhan, Q.H.Zhan, mat Supersonic involve the heat seal of optical microphotograph development assessment sterile food container, European food research and technology (European Food Researchand Technology) 217 (2003) 365-368; And N.N.Shan, P.K.Rooney, A.Ozguler, S.A.Morris, W.D.O ' Brin Jr. uses the ultrasound wave development to detect the real-time method of the seal defect of packaging for foodstuff, J.Food Prot.64 (9) (2001) 1392-1398.Though the channel defective and include (stand-inclusion) defective can be successfully method detecting by this, the wrappage that contain cardboard may disperse more acoustic wave energy and reliable development medium can't be provided.Perhaps, but the amount of this gas permeation method mat detecting helium and in order to identify seepage.The method was emphasized test speed and can finish check (referring to A.Lean, C.Soren, the package integrality and the microbioassay of the detecting of mat gas permeation, packing technique science 4 (1990) 9-20) according to reports in 10 second.Yet the method is enclosed the expensive of helium owing to it and can't be used on the practice.
Other is chosen as the immersion biologic test, it is provoked the integrality of packing and detects pin hole in order to the mat microorganism, for example referring to S.W.Keller, J.E.Marcy, B.A.Blakistone, G.H.Lacy, C.R.Hackney, W.H.Carter Jr., J.Food Prot.59 (7) (1996) 768-771 and H.Eero, G.Wirtanen, L.Axelson-Larsson, T.Mattila-Sandholm, R.Ahvenainen, the examining of destructive seepage method for detecting that is respectively applied for the soft bag of packaging for foodstuff and sterilization depended on property, packing technique science 9 (1996) 203-213; R.Ahvenainen, T.Mattila-Sandholm, L.Axelson-Larsson, G.Wirtanen, micropore size and food be to the influence of the microbiological integrity of aseptic plastic cup, packing technique science, 5 (1992) 101-107; And B.A.Blakistone, S.W.Keller, J.E.Marcy, G.H.Lacy, C.R.Hackney, W.H.CarterJr., the soft bag of sterilization of being provoked by the immersion biologic test pollutes J.Food Prot.59 (1996) 764-767.Insert in the solution that contains the high concentration bacterium with packing and keep somewhere a period of time.This packing is then inserted in the Constant Temperature Incubators.Through behind the setting-up time, inspect packing.Via the existence of microorganism, can assess package integrity properties.Though the method near time of day or even more harsh, therefore the method is consuming time and be not suitable on the line and use.
Most of factory has used the dyestuff infiltration test to follow the trail of the integrality of packing, for example referring to C.E.Sizer, and the chamber test method, theoretical in sterile-processed and the packing of T.B.Dane (editor), volume 4, CRC publishing house, Boca Raton, FL, 1987,75-77.Though this method can be applied to the packing Quality Detection of carrying out in the laboratory.But the method needs long test period and dyestuff possibility contaminated environment.So and be not suitable for using the method to carry out processing procedure control on the line.
And electrolytic trial is favourable because of fast measuring, high sensitive and cost benefit, for example referring to L.Axelson-Larsson, and S.Cavlin, J.Nordstrom, the mat electrolytic conduction is measured aseptic integrality and the micropore of measuring packing, packing technique science, 3 (1990) 141-162 and L.Axelson-Larsson, E.Hurme, S.Cavlin, R.Ahvenainen, the seepage of mat electrolytic trial analyzing and packaging, the packing technique science, 10 (1997) 209-220.Yet this test itself is for the packing and the indecisive test of the laminate that contains aluminium.Electrolytic trial mainly is that mat feeds fixed voltage to electrode, when packing timber has perforation, high electric current will occur and find whether defectiveness of packing timber by this.But some these packing especially contains the packing timber of aluminium and high electric current occurs and be judged as and have defective in electrolytic trial, but it might only be to cause aluminium foil exposed because the inner plastic film is slightly damaged, because of causing electric current, the electrochemical reaction of aluminium foil raises, but this is not the demonstration deterioration for packing timber, so constant error is defective products with still spendable packing timber erroneous judgement.Moreover the method needs high power supply so that 8-10 volt voltage to be provided.
That recent research tendency is emphasized to develop gradually is little, the instrument of portable and battery operated, and be applicable on the spot biological medicine and the technical analysis sensing system that distributes, for example referring to C.Wrotnowski, the higher organism detection technology, genetic engineering news (Genetic Engin.News) 2 (1998) 38-41; S.S.Rajinder, the conduction prospect of biological sensor, biological sensor and electrobiology (Biosensors ﹠amp; Bioelectronics) 9 (1994) 243-264; F.Scheller, F.Schubert, D.Pfeiffer, R.Hintsche, I.Dransfeld, R.Renneberg, U.Wollenberger, K.Riedel, M.Pavlova, M.Kuhn, H.G.Muller, P.Tan, W.Hoffmann, W.Movitz, the research of biological sensor and development: look back Analyst 114 (1989) 653-662; And G.Cui, J.H.Yoo, J.S.Lee, J.Yoo, J.H.Uhm, G.S.C.H.Nam, pre-service is to the carbon paste electrode surface of screen printing and the influence of electrochemical properties, Analyst126 (2001) 1399-1403.Closely knit, cheap, firm and diversified characteristics that electrochemical apparatus has and may be ideal for this purpose, for example referring to E.Magner, electrochemical biological sensing device trend, Analyst123 (1998) 1967-1970 and F.Xu, L.Wang, M.N.Gao, L.T.Jin, J.Y.Jin, crosslinked pair of ferment system of mat is based on Pd-IrO
2The glucose of improved electrode and hypoxanthic electrochemical sensor, Talanta 57 (2002) 365-373.The electrode of screen printing is economical and be easy to volume production and have potential hope owing to it in these situations, for example referring to H.Yamato, T.Koshiba, M.Ohwa, W.Wernet, M.Matsumura, disperse the palladium particulate in the electric conductive polymer film novel method and at the application of biological sensor, Synth.Met.87 (1997) 231-236; P.Sarkar, E.T.Ibtisam, J.S.Steven and A.P.F.Turner, the current type biological sensor of the screen printing that L-and D-Amino acid are measured fast, Analyst 124 (1999) 865-870; J.Wang, V.B.Nascimento, S.A.Kane, K.Rogers, M.R.Smyth, L.Angnes is used for the Tyrosinase electrode of the screen printing of biological sensing ferment inhibitor, Talanta 43 (1996) 1903-1907; And M.Albareda-Sirvent, A.Merkoci, S.Alegret is used for the configuration-review of the ferment biological sensor designs of screen printing, Sensor.Actuat.B 69 (2000) 153-163.The sensor of screen printing is because its advantage of generally declaring such as miniaturization and easy robotization and more favourable and be used for the simple portable device of framework rapid screening purpose and follow the trail of on the spot/on the spot, for example referring to S.V.Dzyadevych, T.Mai Anh, A.P.Soldatkin, N.Duc Chien, N.Jaffrezic-Renault, J.-M.Chovelon, based on the ferment biological sensor development that is used to detect phenolic compound of pH-irritability field-effect transistor, Bioelectro-chemistry 55 (2002) 79-81.Utilize a pair of commercially available screen printing carbon paste plate electrode (SPCS) to contain the integrality of the aseptic laminate packing of aluminium with detecting in this research.The main reason of selection SPCS is for its low cost and be easy to volume production.
Summary of the invention
The method of the relevant a kind of mat cyclic voltammetry detecting containing metal Foilpac material defective of the present invention, this method can be packed in order to the infiltration pin hole that the laminate of distinguishing int packing and metal-containing layer is packed.
The method of the relevant a kind of mat cyclic voltammetry detecting containing metal Foilpac material defective of the present invention, this method is included in and places this packing timber in the electrolytic tank, and in this packing timber ccontaining electrolytic solution, be positioned over an electrode in the electrolytic solution in this packing timber and another electrode is positioned in the outer electrolytic tank of this packing timber, by applying variable voltage and measuring the electric current that is brought out by this and measure this and be packaged as true defect or Artifact.
So-called among the present invention " true defect of packing timber " mean packing timber and have broken hole or the damage that penetrated whole material, and be enough to make this packing timber will make for example intrusion such as air, moisture, microorganism and undermine the article of packaging in it of outside material in use.
So-called among the present invention " Artifact of packing timber " mean packing timber and only have broken hole or damage at internal layer, but the outside in use material of this packing timber for example the article of packaging in it still can't be invaded thereby can not undermined to air, moisture, microorganism etc.
The method of detecting containing metal Foilpac material defective of the present invention mainly is to utilize to feed variable voltage, and detects the electric current that is brought out back and forth, and the defective of judging this packing timber by this is the true defect of above-mentioned definition or is Artifact.
According to the present invention, mainly be to utilize circulation to feed a certain variable range voltage, and the electric current that is brought out during measuring, the packing timber of measuring when the institute desire has the infiltration perforation when being the alleged true defect of the present invention, the electric current that is brought out is directly proportional with perforation size and voltage, but if the packing timber that the institute desire is measured is for only in that the plastic foil of packing timber internal layer is slightly damaged when metal forming is exposed, to make electrorheological big because of the effect that metal has a conduction electron when feeding voltage, but because the oxidation-reduction potential of metal itself, therefore after feeding variable voltage, will make the electric current that is brought out when the voltage of its oxidizing potential, have a sizable electric current because of the electrochemical reaction of metal and change.By the electric current version that detecting is brought out, can distinguish and judge that the packing timber of being detected is for true defect or is Artifact.
According to method of the present invention, can distinguish out the Artifact that the known electrolytic method of mat is detected, need superseded packing timber and can save originally to be determined.Can screen packing timber more accurately in view of the above and greatly reduce cost.
The voltage that method applied of detecting containing metal Foilpac material defective of the present invention can change in a scope, look closely the contained metal species of packing timber of institute desire detecting and different, but generally between for example-3 to+3 volts, change, more fortunately-2 between+2 volts, change, better between-1 to+1 volt, change, for example scan as the arbitrary fixed rate scanning that was selected from for 20 to 80 millivolt/seconds with the tens of millivolts of for example per second with the fixed rate of 50 millivolt/seconds, measure the electric current that each time scanning the time is brought out, change by the electric current that is brought out and to distinguish to true defect or be Artifact.
Can be any packing timber of containing metal paper tinsel according to the packing timber of institute of the present invention desire detecting, be preferably the lamination packing timber that contains aluminium foil.Again more preferably by stationery, polyethylene film, aluminium foil etc. with multilayer laminated boards the lamination packing timber.General innermost layer is a polyethylene film, for example is the packing timber that tygon (PE)/paper/PE/ aluminium foil/PE/PE is constituted.
Description of drawings
Fig. 1 shows the cut-open view of laminated packaging material, and wherein (A) figure shows complete packing timber; (B) figure shows the true hole defect that passes whole packing timber; (C) reaching (D), figure shows that only internal layer has open defect;
Fig. 2 shows the general view of the used surveying instrument of the inventive method;
Fig. 3 (A) shows the circulation peace volt collection of illustrative plates that mat the inventive method is measured integral packaging; Fig. 3 (B) shows the synoptic diagram of used instrument when measuring integral packaging;
Fig. 4 (A) shows the circulation peace volt collection of illustrative plates that mat the inventive method is measured the packing with pin hole; Fig. 4 (B) shows the synoptic diagram of measuring used instrument when having the packing of pin hole; And
Fig. 5 (A) is presented at the cyclic voltammetric collection of illustrative plates of packing internal layer (unbroken packing) micro rupture; Fig. 5 (B) shows the synoptic diagram of measuring used instrument when having the packing of pin hole.
Figure number wherein:
1 outer layer polyethylene layer
2 ply of papers
The polyethylene layer of 3 laminations
4 aluminium laminations
5 inner layer polyethylene layers
Embodiment
The present invention will further be illustrated with the following example, and these embodiment only for the purpose of illustration but not be used to limit the scope of the invention.
Experimental example 1
Material
The composition of wrappage begins to be in regular turn tygon (PE)/paper/PE/ aluminium foil/PE/PE (referring to Fig. 1) from outermost layer.
Among Fig. 1, Fig. 1 (A) shows the integral packaging material by PE (1)/paper (2)/PE (3)/aluminium foil (4)/PE (5)/PE (5) is constituted, Fig. 1 (B) shows that Fig. 1 (C) and Fig. 1 (D) show that only internal layer has the damaged packing material because of the needle pore defect that passes whole packing timber that seals or the machine drilling failure causes.
Rhodamine (rhodamin) B, isopropyl alcohol and sodium chloride are available from Sigma chemical company (U.S. Saint Louis).Hydrogen chloride is available from Fluka (Seelze, Germany).Dye solution is the aqueous isopropanol that contains 1% rhodamine B.Screen printing carbon paste plate electrode (SPCS) derives from ApexBichem (Hsin-chu).
Obtain from traditional market amount to 90 by tygon (PE/) packaging bag that paper/PE/ aluminium foil/PE/PE is constituted in order to carry out the integrality test.Make various artificial defects at these packaging bag inside surfaces.Use has the about 2 microns sewing-needle in a footpath (honed sewing needles) and contact pilotage (touch needles) and pierces through this packaging bag and make the infiltration pin hole.Use the contact pilotage (touch needles) of electric torch on this packaging bag inner plastic layer surface, to keep and made the defective of breaking in 5 seconds.
The experiment paragraph
Embodiment
The method of cyclic voltammetric test
In order to carry out electrolytic trial, packaging bag is cut in half.Product in the packaging bag is poured out and is brushed drying with the pressure air.Half of packaging bag inserted 80 milliliter of 1% sodium chloride and inserted in the electrolytic tank (size: 10 * 8 * 5 centimeters).Carbon electrode (2mm with a screen printing
2) insert in this electrolytic tank and with another electrode and insert (referring to the 2nd figure) in the packaging bag.The potentiostat that uses the laboratory to set up carries out this cyclic voltammetric (CV) and measures.In this research CV is measured the commercially available SPCS of use.In distilled water in 1 to-1 volt range with 50mVs
-1Sweep velocity is carried out this cyclic voltammetry experiment.This voltage is to be chosen to obtain reasonable susceptibility and not cause excessive physics and chemical change at electrode surface.Input and output signal from this potentiometer use Ta card (AT-MIO-16E, international instrument, Austin, Dezhou, the U.S.) to be connected in the personal computer (Pentium 600MHz).This interface card is intended (D/A) converter (12bit) by the digital revolving die of 16-tunnels analogy revolution word (A/D) converter (12bit) and 2-passage and is constituted.Use LabVIEW 5.1 software suites (international instrument, Austin, Dezhou, the U.S.) to make voltage output, data presentation and gained cyclic voltammetric collection of illustrative plates (inducing current is to the mapping of current potential) give sequencing.
The circulation peace volt collection of illustrative plates of integral packaging being measured by CV method of the present invention is shown in Fig. 3 (A), and the synoptic diagram of used instrument is marked in Fig. 3 (B) when measuring integral packaging.
The circulation peace volt collection of illustrative plates of the defective packages of pin hole with the packing of passing being measured by CV method of the present invention is shown in Fig. 4 (A), and the synoptic diagram of used instrument is marked in Fig. 4 (B) when measuring the defective packages of the pin hole with the packing of passing.
By CV method of the present invention the Artifact of packing internal layer micro rupture is packed the circulation peace volt collection of illustrative plates of being measured and be shown in Fig. 5 (A), the synoptic diagram of used instrument was marked in Fig. 5 (B) when the Artifact of measurement packing internal layer micro rupture was packed.
Comparative example
Electrolytic trial and dye penetrant test
Electrolytic trial and dye penetrant test are by the integrality of most of factory in order to the tracking packing.In this research, the integrality of packing is the above-mentioned two kinds of method tests of mat and result and CV method of the present invention comparison also.Electrolytic trial is by detecting two electrodes (diameter: 1mm; Length: 4mm) development electric current and assess.To inserting that electrode in the solution in the packaging bag applies the fixed voltage of 10V and with the ammeter detecting current of degree of accuracy 0.01 μ A.Carry out dye penetrant test to inspect the seepage situation of packaging bag after the electrolytic trial.The dye solution of 5 milliliters of volumes is inserted in the packaging bag.Make packaging bag rotation make the moistening whole packaging bag inner edge of dyestuff and kept 30 minutes.Then inspect this packaging bag to measure whether seepage of packaging bag.
Dyestuff penetration is not seen in dye penetrant test if big electric current appears in electrolytic trial, can be by adding hydrochloric acid in packing container, then can confirm the defective that plastic layer breaks if having corrosion phenomenon in the container, the aluminium exposed because of defect area can corrosion phenomenon occur with hydrochloric acid reaction, and this method can confirm whether packaging bag has the phenomenon that plastic layer breaks but do not occur boring a hole.
Result and discussion
1. the mat cyclic voltammetry is tested the integrality of packing
Cyclic voltammetry is that the current potential with working electrode is controlled (mat potentiometer on the typical case) and measures the technology of common feature of the electric current of the electrode of flowing through.In one of widespread usage of this technology, scan this current potential immediately linearly; This is called linear sweep volt-ampere collection of illustrative plates (LV).The scan round voltammetry is that this circulation can repeat for several times in the first time of linear sweep voltammetry with reverse continuation scanning during the end of scan.This cyclic voltammetric collection of illustrative plates generally in order to the electrochemical behavior of the chemical substance on research bare electrode surface (referring to K.S.Chang, W.L.Hsu, H.Y.Chen, C.K.Chang and C.Y.Chen, use by L-Vetsin oxidase be fixed in palladium deposition the screen printing carbon electrode on the biological sensor that constituted of Photocrosslinkable polymer film in clinical sample, measure Vetsin pyruvic acid transaminase activity, Anal.Chim.Acta 303 (2003) 30-38).Among the present invention, the method is in order to the integrality of test lamination packing.
When an electrode was inserted electrolytic tank, another electrode was inserted (referring to Fig. 2) in the packing.These electrode mat dielectric materials such as tygon separate, and the cyclic voltammetric collection of illustrative plates that forms electric capacity and be used for the integrality packing is shown as rectangle (referring to Fig. 3).Because therefore the electrode that electric current is flowed through and separated by tygon only obtains little inducing current.On the contrary, the circulation peace volt collection of illustrative plates to packing with artificial permeation's pin hole detects big inducing current, as shown in Figure 4.This pin hole forms an ion channel, can make ion flow out this packing.Electric current rises with voltage and increases.
Fig. 5 A is presented at the cyclic voltammetric collection of illustrative plates of packing internal layer (unbroken packing) micro rupture and the electrolysis unit figure that Fig. 5 B shows detecting packing internal layer (unbroken packing) micro rupture.This cyclic voltammetric collection of illustrative plates is different from packing infiltrator.Among the figure, observe peak current (Fig. 5 A) between 0.7 to 1.0 volt, it is owing to die in that the galvanochemistry of this exposed aluminium lamination is during greater than 0.7 volt when current potential.This electric current is by electrolytic cell and in aluminium lamination generation oxidation reaction.By the cyclic voltammogram spectrometry of method gained of the present invention, can be accredited as the defective (true defect) of infiltration packing or the micro rupture (Artifact) of internal layer.Qualification result is shown in table 1.
The package integrity properties test of mat electrolytic measurement and dyestuff penetration method
The theoretical foundation of electrolytic measurement is electrical insulator for the tight plastic containers of envelope.By importing current potential by inserting the packing of saline solution, this packaged unit immerses in the common salt aqueous solution, can measure packaging bag and whether have any perforation.Cause defective packages in any packing defective that allows electric current to flow out packaging bag.This electric current is by the possibility of expression packing defective.Qualification result is shown in table 1.
Table 1
| The number of defects (%) that the mat the whole bag of tricks is measured | |||
| Electrolytic measurement b | Dye penetrant test | Cyclic voltammetry (the inventive method) | |
| Integral packaging a | 0(0％) | 0(0％) | 0(0％) |
| Artificial superheated packing a | 30(100％) | 0(0％) | 3(10％) |
Annotate:
A. detect 30 packings
B. be in application to 10 volts of following electric currents of set potential＞100 micromicroamperes of platinum electrode and be defined as the handicapped.
Table 1 shows mat electrolytic measurement, dye penetrant test and CV method of the present invention pin-hole measurements to the artificial defect packing.Mat electrolytic measurement, the threshold current of packing are accredited as defectiveness during greater than 100 micromicroamperes.The mat dye penetrant test is accredited as defectiveness during the dyestuff seepage.By CV method of the present invention, between 0.7 to 1.0 volt, observe high peak currents and be accredited as defectiveness.This shows that these methods are almost identical result to the measurement of integral packaging and artificial permeation's packing.Most novel flexible packaging is the laminate that various combination made by paper, aluminium foil and plastics.The surface that contacts with product is tygon (PE).This PE layer is supported and is bonded on this aluminium foil layer by extra PE layer again.The poly sublevel that is bonded to this aluminium foil is a ply of paper, and it is in order to hardness between the increase container and printed patterns is provided.Outer field polyethylene layer effect is that the protection ply of paper is avoided influence of moisture.When carrying out electrolytic measurement, there are two kinds of defectives can cause two interelectrode electric current development.The first kind is for piercing through caused pin hole (shown in Figure 1B) because of sealing failure and/or machinery.This pin hole makes ion or dyestuff flow out this packing.Therefore the above-mentioned any method of mat can detect the defective of artificial seepage packing.Second class is by the caused defective of sealing area superheated (Fig. 1 C, 1D), and it causes aluminium lamination and/or inner plastic to break (being called not impaired packing).Should act as the electric bridge beam by exposed aluminium.Table 1 shows that this electrolytic trial, dye penetrant test and CV method are to the difference results between artificial not impaired packaging test.By electrolytic trial, all find to have defective through the packing of detecting.Yet, there is no any packing by dye penetrant test and be accredited as defectiveness.This result shows that traditional electrolytic measurement itself is not a final conclusion to this type of packing, because might defect result be from gas-tight container.Even several packings develop the electric current that greater than 1000 micromicroamperes during electrolytic measurement, seepage is not found in the mat dye penetrant test yet.In the CV method of the present invention, amounting to 30 packings has 90% high peak currents that obtains between 0.7 to 1.0 volt, shown in Fig. 5 A.But micro rupture appears in the internal layer that conclusion goes out in these packings that are accredited as defective.Only 10% packing is identified and is had pin hole.According to CV method of the present invention, do not have an only interior layer defects (Artifact) of tool but still meet the packing timber of packaging standard of pin hole because of filtering out, and can save the packing timber of this mat seepage that electrolytic measurement is accredited as of 90%.The inventive method especially can be identified the caused pin hole of defective that breaks in the inner plastic of the laminate packing that contains aluminium.
By traditional electrolytic measurement, this passes the infiltration pin hole of packing and the defective of breaking of packing plastics internal layer can't be distinguished, because both all detect high electric current.Yet the method for the detecting defective of mat cyclic voltammetry of the present invention can be applicable to distinguish these two kinds of different defectives (being true defect and Artifact).But method fast measuring of the present invention, tool high sensitive, cost benefit aspect also have advantage and can be as contaminated environment as the dyestuff penetration method.
The invention effect
In the statistics contrast, the packing with infiltration micropore is regarded as critical defect, and it will make microorganism infiltrate through in this packing.Yet unspoiled packing is regarded as tiny flaw, and microorganism can not permeated via aluminium lamination.The integrality of packing is essentially and can accepts.Unique need are listed consideration person in and are the interaction between product and the aluminium that exposes.
Mat cyclic voltammetry of the present invention (CV method) and the method for detecting packing defective can be distinguished the infiltration micropore that passes packing and the defective of breaking of packing plastics internal layer.These two kinds of different defectives can't be distinguished by traditional electrolytic trial, because all can detect high electric current in unspoiled packing and infiltration packing.
According to above-mentioned, show that cyclic voltammetry of the present invention is for measuring the quick crucial test method of this laminate packing.Cyclic voltammetry of the present invention is a kind of facility, quite fast and the method for the aseptic aluminium lamination of more reliable detecting package integrity properties.
Claims (6)
1. method of detecting containing metal Foilpac material defective, be included in and place this packing timber in the electrolytic tank, and in this packing timber ccontaining electrolytic solution, be positioned over an electrode in the electrolytic solution in this packing timber and another electrode is positioned in the outer electrolytic tank of this packing timber, by applying variable voltage with the scanning constant rate scanning and measure the electric current that is brought out by this and measure this and be packaged as whether have the perforation defective.
2. the method for claim 1, it is perforation defective and inner layer sheet planar defect in order to the difference packing timber.
3. the method for claim 1 is wherein worked as the electric current that is brought out and is had a violent electric current when changing when a voltage, judges promptly that this is packed only to have an inner layer sheet planar defect.
4. the method for claim 1, wherein this variable voltage is between-3 to+3 volts.
5. the method for claim 1, wherein this sweep speed is the tens of millivolts of per second.
6. the method for claim 1, wherein this containing metal Foilpac material is the packing timber that contains aluminium foil.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237312A (en) * | 2013-06-12 | 2014-12-24 | 通用汽车环球科技运作有限责任公司 | Insulation inspection instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237312A (en) * | 2013-06-12 | 2014-12-24 | 通用汽车环球科技运作有限责任公司 | Insulation inspection instrument |
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