CN101696922A - Method for measuring air permeability of preservative film - Google Patents
Method for measuring air permeability of preservative film Download PDFInfo
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- CN101696922A CN101696922A CN200910228002A CN200910228002A CN101696922A CN 101696922 A CN101696922 A CN 101696922A CN 200910228002 A CN200910228002 A CN 200910228002A CN 200910228002 A CN200910228002 A CN 200910228002A CN 101696922 A CN101696922 A CN 101696922A
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Abstract
The invention discloses a method for measuring air permeability of a preservative film for fruit and vegetable, which comprises the following steps: placing a film sample to be tested on a porous plate between a gas sample chamber and a scavenging chamber of a specific testing device, timing sampling the percentage composition of the concentration of gas to be tested in a testing cup after an intake tube is connected with a gas source of the gas to be tested and the gas charge is finished, recording the time (day), and simultaneously recording pressure in the gas sample chamber before and after sampling through a gas pressure gauge; drawing a graph of time according to natural logarithm values of the concentration of the measured carbon dioxide or oxygen to obtain a straight line, setting the gradient of the straight line as k, and calculating the carbon dioxide permeability coefficient P (mL/m2.d.atm) of the film through the gradient k, namely P = -(V/S)k, wherein the V is the volume (mL) of the cup, and the S is the area (m2) of the film. The method is suitable for measuring common polyethylene or polyvinyl chloride preservative films, and is also suitable for measuring carbon dioxide or oxygen permeability coefficients of preservative films with high air permeability such as micro-pore preservative films, silicon rubber films and the like.
Description
Technical field
The invention belongs to the method for testing of food preservative technology material, particularly a kind of preservative film ventilation performance is measured assay method.
Technical background
Oxygen, the carbon dioxide infiltration coefficient of measuring fruit-vegetable plastic wrap is the research and development fruit-vegetable plastic wrap and carries out the prerequisite that modified-atmosphere package designs.The assay method of existing preservative film exists usually with the next item down or several defectives: (1) measurement range is limited.If any device limit and can only test 5000～100000mL/m
2Gas penetration potential in the datm scope, preservative film such as silicon fenestrated membrane or the micropore plastic wrap high to gas penetration potential, this instrument is invalid; (2) membrane sample both sides gas pressure difference is bigger, can not reflect the ventilative really situation of preservative film, simultaneously the performance of the film especially gas penetration potential of microporous barrier is had considerable influence.(3) equipment complexity, the cost height.The existing apparatus price at tens0000 yuan between the hundreds of thousands unit.At the deficiency that existing equipment exists, patent ZL200720099863.4 proposes a kind of equipment, and this equipment has easy and simple to handle, and test specification is wide, low cost and other advantages.But also there is following shortcoming in this equipment: sealing is not high; Can only at room temperature test; In analyzer cup, during gas concentration, the error that gas sample brings is not eliminated, thereby influenced precision of test result.
Summary of the invention
The purpose of this invention is to provide a kind of preservative film ventilation performance assay method.Can survey the carbon dioxide that is used under different temperatures, measuring preservative film, the gas penetration potential of oxygen.
For achieving the above object, the present invention is by the following technical solutions:
A kind of ventilation characteristic measuring method of fruit-vegetable plastic wrap, the membrane sample of test place on the porous plate between fc-specific test FC device gas sample chamber and the scavenging chamber, and by O-ring seal to guarantee sealing property; There is one deck not have anti-cloth between porous plate plate and the film; The source of the gas of gas is surveyed in draft tube reception, opens the High-pressure air valve on the sample tap, charges into gas to be measured, after close high-pressure process on air intake opening and the sample tap; After inflation is finished, the percentage composition of gas concentration to be measured in the timing sampling test cup, writing time: day, simultaneously by the indoor pressure of gaseous sample before and after the gas gauge record sampling; With the carbon dioxide measured or the natural logarithm value of oxygen concentration the time is mapped, a straight line, the slope of straight line is k, by slope k can be regarded as the carbon dioxide infiltration coefficient P (mL/m of film
2Datm), i.e. P=-(V/S) k, wherein V is the volume (mL) of cup, S is the area (m of film
2).
The gas sample chamber that a kind of ventilation characteristic measuring method of fruit-vegetable plastic wrap, the specific device of use have a cylindrical stainless steel cup to constitute connects cylindrical stainless steel scavenging chamber at the upper edge hole of gas sample chamber; Three openings are arranged on the wall of gas sample chamber: sample tap is surveyed in gas gauge opening, the gentle health check-up of gas feed, and there are nitrogen inlet and nitrogen outlet in the side of scavenging chamber; The edge, junction of gas sample chamber and scavenging chamber is connected by nut, nut.
Gas gauge opening on the gaseous sample locular wall connects a gas gauge, and the gentle health check-up of gas sampling mouth is surveyed on the sample tap High-pressure air valve all is installed.
The nitrogen inlet azine gas cylinder of scavenging chamber, nitrogen outlet leads to atmosphere.
A porous plate is arranged between gas sample chamber and the scavenging chamber, have pair gas not have the material of barrier above the porous plate: do not have anti-cloth or filter paper.
Two rubber seal rings that the tested preservative film of salable clamping edge is arranged on the anchor ring of junction between gas sample chamber and the scavenging chamber.
Characteristics of the present invention:
This method of testing is fit to measure common polythene, Polyvinylchloride preservative film, also is fit to measure the high preservative film of gas penetration potential such as the carbon dioxide of micropore plastic wrap and silicone rubber membrane etc., the infiltration coefficient of oxygen.
Can be used under-10～80 ℃ condition, the oxygen and the carbon dioxide infiltration coefficient of test preservative film, test specification is 0.1 ten thousand---3,000,000 mL/m
2Between the datm.
This proving installation is simple in structure, and is easy to use, can measure the carbon dioxide of preservative film, the infiltration coefficient of oxygen under different temperatures.The content of carbon dioxide or oxygen in different time sampling detection cup, and the pressure of record sampling front and back gas sample chamber, pass through data processing, natural logarithm value with carbon dioxide in the cup (or oxygen) content is figure to the time, can calculate the carbon dioxide of film and the infiltration coefficient of oxygen from the slope of gained straight line.
Device of the present invention improves patent ZL200720099863.4.Replace the constituent material of glass as gas sample chamber with stainless steel, the gentle health check-up of gas sampling mouth is surveyed on the sample tap High-pressure air valve all is installed, thereby has guaranteed the gas tightness of device.Increased the scavenging chamber, the gas that the film infiltration comes that sees through of membrane sample upside has in time been taken away by nitrogen, thereby new device can be tested under different environment temperatures.By on the wall of gas sample chamber, connecting the variation that gas gauge can detect sampling front and back gaseous sample room pressure, and can know the quantity of gas sampled thus, can get rid of the influence of gas sample to the result when data processing, test result has more authenticity.
Description of drawings
Fig. 1 be the natural logarithm value ln P of carbon dioxide content and time (my god) graph of a relation
Fig. 2 be the natural logarithm value ln P of oxygen content and zh time (my god) graph of a relation
Fig. 3 is the specific device synoptic diagram that the ventilation characteristic measuring method of preservative film is used.
Embodiment
A kind of ventilation characteristic measuring method of preservative film comprises following content:
The membrane sample (11) of test places on the porous plate (14) of (3) between gas sample chamber (2) and the scavenging chamber, and passes through O-ring seal (12,13) to guarantee sealing property.Porous plate (14) causes film to sink for preventing that the gaseous sample room pressure from changing, and has one deck not have anti-cloth (15) between plate and the film.
During use, a rubber ring is covered on the rim of a cup of stainless steel gas sample chamber, be placed on the rubber ring preservative film to be tested is smooth again, place an onesize rubber ring above again, cover the lid that constitutes the scavenging chamber then, closely connect the lid of gas sample chamber rim of a cup and formation scavenging chamber with nut, nut.
The source of the gas of gas is surveyed in draft tube (5) reception, opens the High-pressure air valve (8) on the sample tap (6), charges into gas to be measured, after close high-pressure process (7,8) on air intake opening and the sample tap.After inflation is finished, gas concentration to be measured (percentage composition) in the timing sampling test cup, writing time (my god), simultaneously by the indoor pressure of gaseous sample before and after the gas gauge record sampling.With the carbon dioxide measured or the natural logarithm value of oxygen concentration the time is mapped, a straight line, the slope of straight line is k, by slope k can be regarded as the carbon dioxide infiltration coefficient P (mL/m of film
2Datm), i.e. P=-(V/S) k, wherein V is the volume (mL) of cup, S is the area (m of film
2).But the error that when data processing, need bring the result to the sampling of considering gas.
The specific device that the preservative film ventilation performance assay method uses is made up of gas sample chamber to be measured (2) and scavenging chamber (3) that a cylindrical stainless steel cup (1) constitutes.Three openings are arranged on the wall of gas sample chamber (2), and an opening connects gas gauge (4), can test the pressure of gas in the cup of sampling front and back, thereby calculate sampling amount, can proofread and correct the error of having avoided sampling to bring when carrying out data processing.Two is respectively that sample tap (6) is surveyed in the gentle health check-up of gas sampling mouth (5) in addition, and the gentle health check-up of gas sampling mouth is surveyed and High-pressure air valve (7,8) all is housed to guarantee the sealing property of entire equipment on the sample tap.One side of scavenging chamber has nitrogen inlet (9) and outlet (10), nitrogen inlet azine gas cylinder, and nitrogen outlet leads to atmosphere.The oxygen or the carbon dioxide in the film outside can in time be taken away by nitrogen like this, and the oxygen in the maintenance film outside or carbon dioxide are constant all the time to be zero, also can use in the constant temperature railway carriage or compartment like this, can survey the gas penetration potential of film under different temperatures.
Concrete data processing method is seen embodiment 1,2.Oxygen or concentration of carbon dioxide both can be used gas chromatographic analysis, but more convenient with portable oxygen/CO-2 analyser test.
Embodiment 1
A slice tygon preservative film adopts said apparatus at 20 ℃ of infiltration coefficients of measuring its carbon dioxide down.The volume V of gas sample chamber is 890mL, and the area S of film is 0.0088m
2(that is area of gas sample chamber rim of a cup).Begin test in the cup behind the injecting carbon dioxide.The raw data that each time period records and calculate the results are shown in following table.
| Sample time | ??P 1(atmospheric pressure) | Gas content (%) | ??P 2(atmospheric pressure) | ??Ln(P 1) | ??Ln(P 2) | ??Ln(P 1)-L ??n(P 2) | ??Ln(P 1)-Ln( ??P 2) accumulated value | The Ln (P) that proofreaies and correct |
| ??0.0000 | ??9219210 | ??92.1 | ??9127110 | ??16.0368 | ??16.02676 | ??0.01004 | ??0.0100 | ??16.0368 |
| ??0.1104 | ??8537760 | ??84.7 | ??8453060 | ??15.96001 | ??15.95004 | ??0.00997 | ??0.0200 | ??15.9700 |
| ??0.2403 | ??7779840 | ??76.8 | ??7703040 | ??15.86705 | ??15.85713 | ??0.009921 | ??0.0299 | ??15.8871 |
| ??0.3708 | ??7075200 | ??70.4 | ??6997760 | ??15.77211 | ??15.7611 | ??0.011006 | ??0.0409 | ??15.8020 |
| ??0.5257 | ??6262550 | ??61.7 | ??6200850 | ??15.6501 | ??15.6402 | ??0.009901 | ??0.0508 | ??15.6910 |
| ??0.6847 | ??5544900 | ??54.9 | ??5490000 | ??15.52839 | ??15.51844 | ??0.00995 | ??0.0608 | ??15.5792 |
| ??0.8292 | ??4944100 | ??49.0 | ??4895100 | ??15.41371 | ??15.40375 | ??0.00996 | ??0.0707 | ??15.4745 |
| ??0.9861 | ??4383400 | ??43.4 | ??4340000 | ??15.29334 | ??15.28338 | ??0.00995 | ??0.0807 | ??15.3641 |
Illustrate: P
1And P
2Be respectively the preceding gaseous sample chamber pressure (atmospheric pressure) of sampling; The Ln (P) that proofreaies and correct is Ln (P
1) and Ln (P
1)-Ln (P
2) accumulated value and.
With the natural logarithm value ln P of the carbon dioxide content proofreaied and correct to the time (day) mapping, must a straight line, straight slope k is-0.68694, coefficient R
1Be 0.999264.
See Fig. 2
Press P
1The k of=-(V/S) calculates to such an extent that the carbon dioxide infiltration coefficient of this film is 72946.01mL/m
2Datm.
A slice microporous polyethylene preservative film adopts said apparatus at 30 ℃ of infiltration coefficients of measuring its oxygen down.The volume V of gas sample chamber is 890mL, and the area S of film is 0.0088m
2(that is area of gas sample chamber rim of a cup).Begin test after injecting oxygen in the cup.The raw data that each time period records and calculate the results are shown in following table.
| Sample time (my god) | ??P 1(atmospheric pressure) | Gas content (%) | ??P 2(atmospheric pressure) | ??Ln(P 1) | ??Ln(P 2) | ??Ln(P 1)-Ln ??(P 2) | ??Ln(P 1)-Ln ??(P 2) accumulated value | The Ln (P) that corrects |
| ??0.0000 | ??4978020 | ??48.9 | ??4973130 | ??15.42054 | ??15.41956 | ??0.000983 | ??0.0010 | ??15.4205 |
| ??0.0146 | ??4611540 | ??45.3 | ??4607010 | ??15.34407 | ??15.34309 | ??0.000983 | ??0.0020 | ??15.3451 |
| ??0.0285 | ??4336680 | ??42.6 | ??4332420 | ??15.28262 | ??15.28164 | ??0.000983 | ??0.0029 | ??15.2846 |
| ??0.0431 | ??4057830 | ??39.9 | ??4053840 | ??15.21616 | ??15.21518 | ??0.000984 | ??0.0039 | ??15.2191 |
| ??0.0556 | ??3797140 | ??37.7 | ??3793410 | ??15.14976 | ??15.14878 | ??0.000983 | ??0.0049 | ??15.1537 |
| ??0.0757 | ??3440840 | ??33.8 | ??3437460 | ??15.05123 | ??15.05024 | ??0.000983 | ??0.0059 | ??15.0561 |
Illustrate: P
1And P
2Be respectively the preceding gaseous sample chamber pressure (atmospheric pressure) of sampling; The Ln (P) that corrects is Ln (P
1) and Ln (P
1)-Ln (P
2) accumulated value and.
With the natural logarithm value ln P of the oxygen content proofreaied and correct to the time (day) mapping, must a straight line, straight slope k is-4.77296, coefficient R is 0.999354.
See Fig. 3
Press P=-(V/S) k, calculate to such an extent that the oxygen permeability coefficient of this micropore plastic wrap is 506838.1mL/m
2Datm.
Claims (2)
1. the ventilation characteristic measuring method of a fruit-vegetable plastic wrap, it is characterized in that: the membrane sample of test places on the gas sample chamber and the porous plate between the scavenging chamber of fc-specific test FC device, and by O-ring seal to guarantee sealing property; There is one deck not have anti-cloth between porous plate plate and the film; The source of the gas of gas is surveyed in draft tube reception, opens the High-pressure air valve on the sample tap, charges into gas to be measured, after close high-pressure process on air intake opening and the sample tap; After inflation is finished, the percentage composition of gas concentration to be measured in the timing sampling test cup, writing time: day, simultaneously by the indoor pressure of gaseous sample before and after the gas gauge record sampling; With the carbon dioxide measured or the natural logarithm value of oxygen concentration the time is mapped, a straight line, the slope of straight line is k, by slope k can be regarded as the carbon dioxide infiltration coefficient P (mL/m of film
2Datm), i.e. P=-(V/S) k, wherein V is the volume (mL) of cup, S is the area (m of film
2).
2. the ventilation characteristic measuring method of a kind of fruit-vegetable plastic wrap according to claim 1, it is characterized in that: the gas sample chamber that the fc-specific test FC device of use has a cylindrical stainless steel cup to constitute connects cylindrical stainless steel scavenging chamber at the upper edge hole of gas sample chamber; Three openings are arranged on the wall of gas sample chamber: sample tap is surveyed in gas gauge opening, the gentle health check-up of gas feed, and there are nitrogen inlet and nitrogen outlet in the side of scavenging chamber; The edge, junction of gas sample chamber and scavenging chamber is connected by nut, nut; Gas gauge opening on the gaseous sample locular wall connects a gas gauge, and the gentle health check-up of gas sampling mouth is surveyed on the sample tap High-pressure air valve all is installed; The nitrogen inlet azine gas cylinder of scavenging chamber, nitrogen outlet leads to atmosphere; A porous plate is arranged between gas sample chamber and the scavenging chamber, have pair gas not have the material of barrier above the porous plate: do not have anti-cloth or filter paper; Two rubber seal rings that the tested preservative film of salable clamping edge is arranged on the anchor ring of junction between gas sample chamber and the scavenging chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910228002A CN101696922A (en) | 2009-11-05 | 2009-11-05 | Method for measuring air permeability of preservative film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910228002A CN101696922A (en) | 2009-11-05 | 2009-11-05 | Method for measuring air permeability of preservative film |
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| Publication Number | Publication Date |
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389498A (en) * | 2017-07-07 | 2017-11-24 | 金华职业技术学院 | A kind of method for measuring methane transmitance |
| CN108333089A (en) * | 2017-10-20 | 2018-07-27 | 北京空天技术研究所 | A kind of gas permeability analysis method, system and ventilation property test device |
| CN109580455A (en) * | 2019-01-07 | 2019-04-05 | 东北大学 | A kind of system and method measuring copper foil porosity |
| CN115479880A (en) * | 2022-10-17 | 2022-12-16 | 大连理工大学 | Method for measuring permeability coefficient of high-density polyethylene film in process of blocking volatile organic compounds |
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2009
- 2009-11-05 CN CN200910228002A patent/CN101696922A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107389498A (en) * | 2017-07-07 | 2017-11-24 | 金华职业技术学院 | A kind of method for measuring methane transmitance |
| CN107389498B (en) * | 2017-07-07 | 2024-01-12 | 金华职业技术学院 | Method for measuring methane transmittance |
| CN108333089A (en) * | 2017-10-20 | 2018-07-27 | 北京空天技术研究所 | A kind of gas permeability analysis method, system and ventilation property test device |
| CN109580455A (en) * | 2019-01-07 | 2019-04-05 | 东北大学 | A kind of system and method measuring copper foil porosity |
| CN109580455B (en) * | 2019-01-07 | 2021-11-05 | 东北大学 | System and method for measuring porosity of copper foil |
| CN115479880A (en) * | 2022-10-17 | 2022-12-16 | 大连理工大学 | Method for measuring permeability coefficient of high-density polyethylene film in process of blocking volatile organic compounds |
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Open date: 20100421 |