PE cling film oxygen barrier performance detection program - Database & Sql Blog Articles

Abstract: Plastic wrap is a plastic packaging product used by people to keep fresh food. It can be heated with microwave food and stored in the refrigerator to the refrigerator. Therefore, it is required to have high oxygen permeability. In this paper, Labthink VAC-V2 differential pressure gas permeation instrument is used to test the oxygen barrier performance of PE plastic wrap. The test process, test principle and equipment parameters are detailed. The company chooses oxygen transmission performance test equipment and test. The method can be referred to. Key words: PE cling film, oxygen permeability, oxygen transmission rate, barrier properties,

Differential pressure gas permeation instrument

1. The current wrap film is a kind of plastic packaging product, usually with ethylene as the masterbatch.

Polymerization

It is mainly used in microwave food heating, refrigerator food preservation, fresh food and cooked food packaging. It is widely used in family life, supermarkets, hotels, restaurants and industrial food packaging. Depending on the materials used and the addition of plasticizers, cling film is mainly divided into the following types, which are suitable for different occasions. The first type is polyethylene, referred to as PE. This material is mainly used in food packaging, such as fruit, vegetables and semi-finished products sold in supermarkets. It is characterized by a wide range of can be packaged fat foods, which can be heated in a microwave oven, but the temperature is Not more than 110 degrees Celsius. The second type is polyvinyl chloride, referred to as PVC. This material can also be used for food packaging, but it has certain harm to the safety of human body. The third type is polyvinylidene chloride, referred to as PVDC, which is mainly used for some. Packaging of cooked food, ham and other products. Among the three kinds of plastic wrap, the cling film of PE and PVDC is safe for the human body and can be used with confidence, while the PVC wrap film is harmful to the human body because it contains carcinogens. Therefore, PE wrap is preferred when purchasing cling film. The advantages and disadvantages of PE cling film on oxygen barrier are related to the freshness of food. Under normal circumstances, the greater the oxygen transmission rate (ie, the higher the barrier property), the better the preservation effect of fresh food.
Figure 1 PE cling film 2, testing standard Domestic air soft plastic packaging material oxygen transmission rate test method is mainly pressure difference and Faulun method (ie, equal pressure method), the reference method standard is GB/T 1038 "plastic Membrane and Sheet Gas Permeability Test Method Differential Pressure Method and GB/T 19789 "Packaging Material Plastic Film and Sheet Oxidation Permeability Test Coulomb Test Method". In this paper, the pressure difference method is used as the principle for testing. The reference standard is GB/T 1038. 3. The PE plastic wrap film produced by a factory in the test sample. 4. Test equipment VAC-V2 differential pressure gas permeation instrument independently developed by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 VAC-V2 differential pressure gas permeation instrument 4.1 Test principle VAC-V2 uses the differential pressure test principle, the pre-treated sample is placed between the upper and lower test chambers, clamping. First, vacuum treatment is performed on the low pressure chamber (lower chamber), and then the whole system is vacuumed; 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) This equipment is suitable for packaging gas permeability test of plastic film, sheet, paper, cardboard and composite materials, cosmetic hose sheet, various rubber sheets, etc., including oxygen, air, nitrogen, Gas such as carbon dioxide.

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Film type: gas permeability test of film materials such as various plastic films, paper-plastic composite films, aluminized films, aluminum foils, and aluminum foil composite films.

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Sheet class: Gas permeability test of various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet, etc. (2) This equipment 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) This equipment can meet a variety of national and international standards, such as ISO 15105-1, ISO 2556, GB/T 1038, ASTM D1434, JIS K7126-1, YBB 00082003. 4.3 Equipment parameters

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Test Range:

0.05 ~ 50,000 cm ³ /m ² ·24h·0.1MPa

.

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Number of samples:

3

Pieces (data are independent)

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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

.

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Support for testing of toxic gases and flammable and explosive gases (required restructuring).

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Data fitting at any temperature can be performed to easily obtain test results under extreme conditions.

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stand by

Lystem ^TM

Laboratory data sharing system, unified management test results and test reports

5, the test process (1) use the sampler to cut the size

Φ97 mm

3 samples. (2) Three samples were clamped to the three test chambers of the device. (3) Set the sample name, sample thickness, test temperature, test humidity and other parameters. (4) Start the vacuum pump. (5) Click the “Start Test” option, the test starts, and the instrument automatically calculates and displays the test results. 6. Test results The oxygen transmission rates tested in this paper were: 49.3704 cm ³ /m ² ·24h·0.1MPa, 48.1021 cm ³ /m ² ·24h·0.1MPa, 48.2883 cm ³ /m ² ·24h·0.1MPa. 7. Conclusion The VAC-V2 differential pressure gas permeation instrument is a professional oxygen permeability tester for membranes and sheets. The equipment is simple to operate, has high test accuracy and good repeatability, and can reflect the PE wrap to the outside oxygen. Barrier performance. As a leader in the development and manufacturing of packaging inspection equipment, Labthink provides professional, high-end packaging inspection equipment and testing services to customers around the world.