This standard specifies the oxygen permeability test method for packaging materials under steady state - coulometer test method. This standard is applicable to the oxygen permeability test of packaging materials such as plastic films, sheets, composite materials, plastic composite paper, plastic coated fabrics, etc., and can determine the oxygen permeability, oxygen permeability, oxygen permeability constant, etc. of packaging materials. GB/T 19789-2005 Coulometer test method for oxygen permeability test of plastic films and sheets for packaging materials GB/T19789-2005 standard download decompression password: www.bzxz.net
This standard specifies the oxygen permeability test method for packaging materials under steady state - coulometer test method. This standard is applicable to the oxygen permeability test of packaging materials such as plastic films, sheets, composite materials, plastic composite paper, plastic coated fabrics, etc., and can determine the oxygen permeability, oxygen permeability, oxygen permeability constant, etc. of packaging materials.

National Standard of the People's Republic of China
GB/T19789—2005
Packaging material
Plastic film and sheet oxygen
Coulombometer test method
Packaging material-Test method for furoxygen gas permeability characteristics of plastics film and gheeting--Coulombometer sensor
2005-05-25Promulgated
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of China
2005-11-01Implementation
CB/119789—2005
This standard adopts AS1M135S8519954 Plastic film and sheet oxygen permeability test method-1 Coulombometer test method according to continental standards.
The main content of the non-standard is different from 49ME3935-1955, and only the relevant device components are used. The text and chapter 5 indentation are different from the M398515 standard.
The ASIMD3u85 standard does not specify specific test environmental conditions. This approval adopts the environmental conditions specified in the GB/T2918 standard.
The meaning of \steady state\ in this standard shall be confirmed by A.5TM>1441-192 (1598)>Plastic film and follow the steady state definition in the gas permeability test method. This standard is issued by China National Packaging Corporation.
This standard is under the jurisdiction of the National Medical and Chemical Technical Committee: This standard is issued by the National Packaging Product Quality Supervision and Inspection Center (Jinan) and the drafters of this standard are: Xia Xingdong, Zhou Jiayan, Wang Weishan, 1 Scope
Packaging materials Plastic film and sheet Oxygen
Permeability test library
Established standard to specify the concept of packaging materials - oxygen permeability test method
CH/T 19783—2005
This standard is applicable to the test of oxygen permeability of plastic films, films, composite materials, plastic composites, plastic coated fabrics and other packaging materials, and is used to determine the oxygen permeability, oxygen permeability constant, etc. of packaging materials. 2 Normative references
The provisions in the following documents are considered as the provisions of this standard through reference to this standard. For referenced documents with a date, all subsequent revisions (including errors) or revisions are not applicable to this standard. However, the latest version of the document may be used according to the agreement reached between major standards. For referenced documents without a date, the latest version shall apply to this standard. [F3/12918 Sample Conditions and Test Environment GB/16572 Mechanical Measurement Method for Determination of Thickness of Net Spray and Screen 3 Techniques and Definitions
The following terms and definitions apply to this standard. 3.1
Standby-stute
The state when the amount of gas absorbed by the sample gradually exceeds the amount of gas selected for testing and reaches equilibrium. 3.2
Oxygen transmission rate oxygenlransissiunrate.(hCTR is the number of gases that pass through a unit volume of a sample in a unit volume under test conditions. The international unit is 1mal/m,5) In a standard atmosphere () m>, the unit of oxygen transmission rate is m/m·21) At standard temperature and KJ (StaniardTemxmreailPrrssimrSTP>1atm=3.1O13Mla.IcmsJR=24.62umol.24 h=86.4>:10*g,g/cm(5TP)/(r-74b5,1nGX1mcl/(ms)3.3
Gas flow rate yrmeao
The difference between oxygen flow rate and the gas partial pressure of the sample. The international unit is (·s·Pa) The unit of oxygen flow rate used is m/m,21h6.1M,3. 4
The oxygen transmission efficiency is xygenpermeabilltycoeffilcient, Po I gas gradually excess and Cheng rod thickness! The actual single yield is mo./(,>,P) The commonly used oxygen permeability constant is cm/(m·34h-(.1MPa. The oxygen permeability constant is a kind of material, which is only meaningful for the potential material. 4 Experimental theory
The sample will be divided into two parts. Or the same test oxygen, another example is the carrier gas, gradually through the single oxygen carrier gas into the Coulomb flow and the chemical reaction and huge pressure, talk about the electrical layer and the unit of the oxygen number in the north of the comment comment on the appropriate ratio.GBT t9789—2005
5 Test specimens
5.1 The specimens shall be representative and uniform in size without folds, cracks, pinholes or other defects. The test specimens shall be cut to a size that matches the test instrument.
5.2 At least five points on the entire specimen shall be measured using a desiccant that meets the requirements of B/T6 standard, and the maximum and minimum values ​​shall be recorded, and the average value shall be calculated.
5.2 If the test specimen is asymmetrical, the two sides of the specimen shall be marked, with the surface facing the test gas. 6 Sample conditioning and test environment
E.1 Place the sample in a desiccant containing hydrochloric acid or other desiccant for conditioning for a period of time not exceeding 1 hour. 6.2 The experimental conditions shall be 4 to 2 hours, and the relative humidity shall be 53% + 10% 7.1 Instrument structure: oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1 oxygen permeability test equipment diagram: see Figure 1
6) The two parts of the breathable chamber should be equipped with sealing parts that can be closed when entering or exhausting. c) The breathable chamber should be equipped with a temperature control device. The entire test instrument can be equipped with multiple breathable chambers, which can create a test detail for each test. 7.2.2 Catalytic device
The catalytic device consists of a metal tube and is equipped with a channel. A 3-5% solid catalyst containing 0.5% platinum or zirconium oxide is placed in the metal to produce a target gas without oxygen. 7.2.3 Coulometer
The maximum flow rate of 5l/min~100mL/min is used to measure the sulfur carrier gas. 7.2.4 Flow regulating valve
Used to adjust the flow rate of oxygen and nitrogen:
7.2.5 Coulometer
The coulometer is sensitive to oxygen and its constant flow characteristic is used to detect the oxygen passing through. 7.2.6 Negative resistor
The current produced by the detector passes through a load device and the output of the negative resistor is measured. 7.2.7 Voltage recorder
Use a multimeter to record the back pressure generated on the load device. The recorder should be able to record a full-scale voltage of 51mV and a minimum of 0.100mV with a drop value of at least JuV: its impedance should be at least 50U. 7.3 Reagents and materials
7.3.1 Oxygen gas
can be composed of a mixture of ammonia and hydrogen, in which the carrier gas must contain 0.5~0.0% by volume. The gas should be dry: the volume percentage of oxygen should not be higher than 1.01%.
7.3.2 Oxygen test gas
should be dry: the content should not be less than 99.5%.
7.3.3 Sealing Grease
The piston is made of high-quality organic-based grease to form a vacuum grease, and the sample in the gas chamber is sealed with it. 8 Test steps
8.1 Open the gas chamber, and apply a thin layer of sealing grease on the upper part of the convex part of the lower part of the gas chamber. Take out the sample from the dry burner and cut it into a suitable size. Place the test piece carefully on the grease to avoid wrinkling the sample. Cover the gas chamber cover and tighten it tightly. B.2 Open the oxygen switch of the gas chamber and open the nitrogen carrier valve. Blow out the air in the upper and lower parts of the gas chamber at a flow rate of 50L/min~-ml/min. After 3min~.4min, reduce the flow rate to 1./min~1:mL/min, and then set the speed to 30in
8.After the oxygen is introduced into the system for 30 minutes, turn the valve to the coulometer position, and the gas from the two sides of the ventilation chamber enters the coulometer. When a stable voltage is obtained on the recorder, the voltage at this time is the equal voltage E. 8.4 After E: is determined, turn off the switch, stop the chlorine gas from entering the test gas side of the ventilation chamber (oxygen side), and introduce the test gas (oxygen) into the oxygen side of the ventilation chamber.
8.5 The voltage value input on the coulometer should increase continuously and finally reach a constant value. This value is the test voltage value: E, clothes. 8.6 Record the temperature of the two sides of the ventilation chamber.
8.7 Test at least 3 samples for each sample. GB/T197892005
9 Boundary measurement
9.1 Gas permeability chamber
In:
R. -(EE>Q/A-R)
Air permeability, em/m2.24 h):
F.—Test voltage in steady state, V
Pre-test voltage, nV:
A-operating system.m
Instrument test constant: cl+n/(mV-24h): K-
Negative value of the positive electrode.
9.2 Gas transmission rate
P= Rn/P
Oxygen transmission, mnr21ha.1MPa:
Oxygen transmission rate.m*2h:
- The partial pressure of the test gas in the chamber, in MP, that is, the number of oxygen parts per liter multiplied by the total pressure (approximately 1 atmosphere). The oxygen fraction on the gas side is regarded as. www.bzxz.net
9.3 Oxygen transmission constant
Pi, = Pe +
Where.
Gas transmission real number tmn·24h-o.1MPa;
- Oxygen transmission, m/m*2.0. "Mal;
- Such a group of words,
9, 4 Test screening results
The acid test results are based on the average value, retaining 10 significant figures. 19 Test pull teeth
The test submission should include the following content,
The test method or test method used;
The test vehicle used:
The maximum value of the test stop, the average value of the small amount (d) or the test result,
The test case,
The test personnel and the test port,
Other 4 items that must be stated in the actual limit, etc.
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