When the seeds are packaged in the form of vacuum-coated aluminum composite film, the flexibility of the package plays a decisive role in the barrier properties. In this paper, Labiftink FDT-02æ‰æ“ tester and VAC-V2 differential pressure gas permeation instrument are used to test the change of oxygen permeability before and after packaging of aluminum alloy composite film. The basic process of the test and the applicable scope of the test equipment are introduced. Equipment parameters and other content, companies can refer to when selecting flexibility test equipment and test methods.
1, meaning
Melon seeds are roasted and roasted products, rich in fat, protein, sugar and various organic acids. Because it is sweet and delicious, it has become a must-have snack for the public. The common material used in the packaging of melon seeds is aluminum-plated composite film, that is, alumina material is evaporated on one of the plastic films, and the composite film containing aluminum metal material is more brittle and creased and pinholes compared with other plastic composite films. If the flexibility of the aluminum-plated composite film package is poor, the number of creases and pinholes will be dense, and the barrier properties and physical and mechanical properties of the package will be reduced, which may lead to slight air leakage or even bag breakage, resulting in the appearance of seeds. Soft skin, halal smell and other issues. In order to prevent the above problems of melon seeds, how to verify the flexibility of the aluminized composite film, it is necessary for the melon seed production enterprises to strengthen the barrier performance test before and after the aluminized composite film packaging.
Figure 1 Aluminium coated aluminum film packaging
2, the implementation of standards
The domestic test methods for oxygen packaging of soft composite sheets include coulometric method (equal pressure method) and differential pressure method. The reference method standards are GB/T 1038-2000 "Plastic film and sheet gas permeability test method pressure difference". Law and GB/T 19789-2005 "Packaging materials plastic film and sheet oxidation permeability test coulomb meter detection method", the reference standard of this paper is GB/T 1038 differential pressure method. At present, the domestic testing performance has not been targeted. The test in this paper refers to ASTM F392 “Testing Method for Flexural Durability of Flexible Barrier Materials†to simulate the process of production, processing and transportation of aluminum-plastic composite film.æ‰æ“, folding damage and other behaviors. In this paper, the anti-caries performance of the material is judged by detecting the change of the barrier properties of the sample before and after the enthalpy.
3, test samples
A brand of aluminum plated composite film provided by a brand.
4, test equipment
Jinan Languang Electromechanical Technology Co., Ltd. independently developed and designed the FDT-02æ‰æ“ tester and VAC-V2 differential pressure gas permeation instrument.
Figure 2 FDT-02æ‰æ“ tester
Figure 3 VAC-V2 differential pressure gas permeation meter
4.1 Test principle
The VAC-V2 adopts the differential pressure test principle, and the pre-treated sample is placed between the upper and lower test chambers and clamped. First, vacuum treatment is performed on the low pressure chamber (lower chamber), and then the whole system is evacuated; when the specified degree of vacuum is reached, the lower chamber of the test is closed, and the test gas of a certain pressure is filled into the high pressure chamber (upper chamber), and the test gas is ensured. A constant pressure difference (adjustable) is formed on both sides of the sample; thus, the gas will permeate from the high pressure side to the low pressure side under the action of the pressure difference gradient, and the internal pressure of the low pressure side is monitored and processed, thereby obtaining the test sample. Various barrier parameters.
4.2 Scope of application
(1) VAC-V2 differential pressure gas permeation meter is suitable for packaging gas permeability test of plastic film, sheet, paper, cardboard and composite materials, cosmetic hose sheet and various rubber sheets.
Film type: gas permeability test of film materials such as various plastic films, paper-plastic composite films, co-extruded films, aluminized films, aluminum foils, and aluminum foil composite films.
Sheet type: Gas permeability test of various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet, etc.
(2) VAC-V2 differential pressure gas permeation meter is suitable for the permeability test of various gases, such as oxygen, carbon dioxide, nitrogen, air, helium, etc., as well as the barrier properties of various films for flammable and explosive gases.
(3) VAC-V2 differential pressure gas permeation instrument can meet a variety of national and international standards, such as ISO 15105-1, ISO 2556, GB/T 1038-2000, ASTM D1434, JIS K7126-1, YBB 00082003.
4.3 Equipment parameters
The technical parameters of the VAC-V2 differential pressure gas permeation instrument are as follows:
Test range: 0.05 ~ 50,000 cm3 / m2 · 24h · 0.1MPa.
Number of samples: 3 pieces (data are independent)
Test temperature range: 5 ° C ~ 95 ° C, temperature control accuracy ± 0.1 ° C; test humidity range: 0% RH, 2% RH ~ 98.5% RH, 100% RH, temperature control accuracy ± 1% RH.
Support for testing of toxic gases and flammable and explosive gases (required restructuring).
Data fitting at any temperature can be performed to easily obtain test results under extreme conditions.
Support LystemTM laboratory data sharing system to unify test results and test reports
4.4 sample preparation process
A sample of Φ97 mm in size was cut from the sample of the aluminized composite film of the untwisted melon with a sampler, and the oxygen transmission rate was to be tested.
3 pieces of sample with a length of 280 mm and a width of 200 mm were cut from the sample of the aluminized composite film of the melon, and the sample was fixed on the FDT-02æ‰æ“ tester with a pressure-sensitive double-sided tape of 10 to 12 mm width. The sputum mode was tested.
A sample of Φ97 mm in size was cut on the sputum sample by a sampler, and the oxygen transmission rate was to be tested.
5, the test process
(1) The three samples before the raft were clamped in the test chamber of the VAC-V2 differential pressure gas permeation instrument for testing.
(2) Set the sample name, sample thickness, test temperature, test humidity and other parameters on the differential pressure gas permeation instrument.
(3) Start the vacuum pump.
(4) Click the “Start Test†option, the test starts, and the instrument automatically calculates and displays the test results.
(5) The three samples after the enthalpy were tested in the order of (1) ~ (4), and the average value of the oxygen permeability of the sample before and after the enthalpy was compared.
6, test results
The average oxygen transmission rate of the sample beforehand was 0.5584 cm3/m2?24h?0.1MPa; the average oxygen transmission rate after helium was 19.5874 cm3/m2?24h?0.1MPa.
7. Conclusion
It can be seen from the above results that the oxygen transmission rate of the aluminized composite film of the melon seeds is obviously increased, indicating that the aluminum-plated composite film of the melon seeds is prone to creases or tiny pinholes during production and sales, which may lead to excessive oxygen permeation. . In order to ensure the product shelf life, quality screening can be carried out by timely monitoring the changes in oxygen transmission rate before and after the aluminized composite film package used. VAC-V2 differential pressure gas permeation instrument is a professional oxygen permeability test instrument for film and sheet. It has simple operation, high test accuracy and good repeatability. It is combined with FDT-02æ‰æ“ tester to evaluate packaging before and after packaging. The anti-cracking performance, barrier properties and sealing properties of the aluminum-plastic composite film. Labthink has been committed to providing professional testing services and equipment to customers around the world. Over the years, it has provided tens of thousands of barrier testing services to customers around the world, providing customers with reliable data support. For more information on related test instruments, you can log in to view specific information. Labthink is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry.
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