Abstract: The window-opening plastic packaging bag belongs to the type of window packaging. The transparent plastic film in the window opening area and the printed plastic film in the non-opening area have different barrier properties, and how to solve the different materials in the window packaging. The oxygen barrier verification is related to the impact of the overall barrier properties of the package on the quality of the contents. In this paper, oxygen barrier is taken as an example. Peanut window-opening plastic packaging bag is used, and the oxygen permeability of the plastic composite membrane in the window-opening area and non-windowing area is monitored by differential pressure gas permeation instrument. The industry provides an effective data reference.
Key words: window packing, window-opening plastic packaging, printing area, transparent area, oxygen barrier, barrier property, oxygen permeation, oxygen transmission rate, shelf life, deterioration 1, test significance
The window-opening plastic packaging bag is a kind of window packaging, which is a common packaging form on the food, that is, the plastic packaging bag is divided into two parts: a printing area and a non-printing area, and the non-printing area is a transparent plastic film, just like A window is opened in the package to show the contents to the consumer, and it has a great beautification effect on the shelf display. For plastic packaging bags, the difference between the window opening area and other regional packaging materials is that there is no printing, and some packaging bags also have different conditions in the window opening area and other areas. Therefore, whether it is due to printing factors or materials, the barrier properties of the window opening area and other areas are not the same. For such packaging, the materials of the window opening area and the non-winding area should be tested for barrier properties.
Taking oxygen as an example, the oxygen barrier property of the packaging material is generally characterized by oxygen transmission rate, and the lower the value, the better the oxygen barrier property, and the packaged contents are not easily deteriorated. Therefore, the oxygen transmission rate of each area of ​​the window-opening plastic packaging bag should be low, so as to meet the production and use requirements that are not easily deteriorated during the warranty period. For the above-mentioned performance testing, an oxygen barrier test instrument should be used to detect the oxygen permeability of the plastic composite film on the printing area and the window opening area of ​​the same sample. In this paper, the peanut product of window-opening packaging is taken as an example. The VAC-V2 differential pressure gas permeation instrument produced by Labthink is used to introduce the detection method, principle and test procedure of oxygen barrier, and provide window opening for related industries. Comparative technical data for plastic packaging is used as a reference.
The oxygen barrier test method of common plastic packaging bags is divided into equal pressure method and differential pressure method, and the test chamber of the detecting device using the principle of differential pressure method is divided into upper and lower parts, the upper chamber is a high pressure chamber, and the lower chamber is a lower chamber. In the low pressure chamber, the sample is located between the two test chambers. During the test, the sample is clamped between the two test chambers. First, the low pressure chamber is evacuated, and then the whole system is evacuated. When the specified vacuum is reached, the low pressure chamber is closed and a certain pressure is applied to the high pressure chamber. The test gas forms a constant pressure difference (adjustable) between the two test chambers (ie, both sides of the sample), and the test gas penetrates from the high pressure chamber to the low pressure chamber under the action of the pressure difference gradient, passing through the low pressure chamber The internal pressure is monitored to obtain the barrier properties of the sample.
At present, the standard for the detection method of oxygen permeation of plastic packaging mainly refers to GB/T1038-2000 "Phenomenon of Pressure Difference of Plastic Film and Sheet Gas Permeability Test Method".
3. Test equipment
3.1 Scope of application This paper uses the Labthink VAC-V2 differential pressure gas permeation instrument to test the oxygen permeation of peanut window-opening bags.
(1) This equipment is specially used for testing the gas permeability, permeability coefficient, solubility coefficient and diffusion coefficient of various film and sheet samples at various temperatures.
Film type: such as various plastic film, plastic composite film, paper-plastic composite film, co-extruded film, aluminized film, aluminum foil, aluminum foil composite film and other film-like materials.
Sheets: such as various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet.
(2) This equipment can also be extended to aerospace materials, paper and paperboard, paint film, fiberglass cloth, glass fiber paper, cosmetic hose sheets, various rubber sheets and other materials for gas permeability testing.
(3) This equipment is suitable for the permeability test of various gases, such as oxygen, carbon dioxide, nitrogen, helium, air, etc.
(4) This equipment meets many national and international standards, such as GB/T1038, ISO15105-1, ISO2556, ASTMD1434, JISK7126-1, YBB00082003.
3.2 Equipment parameters (1) The normal test range of the equipment is 0.05~50,000cm3/m2·24h·0.1MPa, which can be extended to 500,000cm3/m2·24h·0.1MPa, and the vacuum resolution can reach 0.1Pa.
(2) The temperature control range of the equipment is 5°C~95°C, the temperature control accuracy is ±0.1°C; the humidity control range is 0%RH, 2%RH~98.5%RH, 100%RH, and the humidity control precision is ±1%. RH can meet the testing requirements of different test conditions of samples.
(3) This equipment has three completely independent test chambers, which can test three identical or different samples at the same time.
(4) This equipment can be used to fit data at any temperature, and the test results under extreme test conditions can be easily obtained.
(5) After the system is modified, the equipment can also support the testing of toxic gases and flammable and explosive gases.
(6) This equipment provides standard film for rapid calibration to ensure the accuracy and versatility of the test data.
(7) The equipment supports the LystemTM laboratory data sharing system to uniformly manage test results and test reports.
4, test conditions <br> <br> Location: Labthink packaging safety testing center tests temperature and humidity: 23 ℃, 0% RH
Test method: differential pressure method 5. Test procedure (1) Three specimens having a diameter of 97 mm were cut from the surface of the window portion of the peanut packaging sample by a special cutter.
(2) Evenly apply a layer of vacuum grease along the periphery of the three sample chambers of the equipment. Note that the vacuum grease should not contaminate the test area, and then place a filter paper with a diameter of 65 mm in the test area.
(3) Three samples were clamped to three test chambers.
(4) Set the test temperature, humidity, sample thickness and other parameter information, open the vacuum pump, water bath temperature control device, click the start test option, the test begins.
(5) The instrument automatically calculates the test results based on the monitoring of the pressure in the low pressure chamber.
(6) According to the step (1), three pieces of the sample are cut out from the non-opening area of ​​the sample, that is, the printing area, and then the detection is performed according to the steps (2) to (5).
6, test results
The average test results of the oxygen permeation amount in the sample window opening area and the printing area were 72.408 cm 3 /m 2 • 24 h • 0.1 MPa, 66.488 cm 3 /m 2 • 24 h • 0.1 MPa, respectively. ?
7, using the summary <br> <br> VAC-V2 Gas Permeability meter test windowed plastic bags when the amount of oxygen transmission can acquire stable and accurate results of oxygen barrier properties, the packaging material can be assessed correctly fenestration The barrier properties of each zone can effectively filter the packaging materials and determine the window opening method. The testing equipment and inspection standards used in this scheme are also applicable to the oxygen transmission test of other soft plastic composite membrane materials. 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 about the relevant testing instruments, you can visit Jinan Languang for specific information or call us. Labthink is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry.
Key words: window packing, window-opening plastic packaging, printing area, transparent area, oxygen barrier, barrier property, oxygen permeation, oxygen transmission rate, shelf life, deterioration 1, test significance
The window-opening plastic packaging bag is a kind of window packaging, which is a common packaging form on the food, that is, the plastic packaging bag is divided into two parts: a printing area and a non-printing area, and the non-printing area is a transparent plastic film, just like A window is opened in the package to show the contents to the consumer, and it has a great beautification effect on the shelf display. For plastic packaging bags, the difference between the window opening area and other regional packaging materials is that there is no printing, and some packaging bags also have different conditions in the window opening area and other areas. Therefore, whether it is due to printing factors or materials, the barrier properties of the window opening area and other areas are not the same. For such packaging, the materials of the window opening area and the non-winding area should be tested for barrier properties.
Taking oxygen as an example, the oxygen barrier property of the packaging material is generally characterized by oxygen transmission rate, and the lower the value, the better the oxygen barrier property, and the packaged contents are not easily deteriorated. Therefore, the oxygen transmission rate of each area of ​​the window-opening plastic packaging bag should be low, so as to meet the production and use requirements that are not easily deteriorated during the warranty period. For the above-mentioned performance testing, an oxygen barrier test instrument should be used to detect the oxygen permeability of the plastic composite film on the printing area and the window opening area of ​​the same sample. In this paper, the peanut product of window-opening packaging is taken as an example. The VAC-V2 differential pressure gas permeation instrument produced by Labthink is used to introduce the detection method, principle and test procedure of oxygen barrier, and provide window opening for related industries. Comparative technical data for plastic packaging is used as a reference.
Figure 1 windowed plastic bag
　　
2, detection method 　　
The oxygen barrier test method of common plastic packaging bags is divided into equal pressure method and differential pressure method, and the test chamber of the detecting device using the principle of differential pressure method is divided into upper and lower parts, the upper chamber is a high pressure chamber, and the lower chamber is a lower chamber. In the low pressure chamber, the sample is located between the two test chambers. During the test, the sample is clamped between the two test chambers. First, the low pressure chamber is evacuated, and then the whole system is evacuated. When the specified vacuum is reached, the low pressure chamber is closed and a certain pressure is applied to the high pressure chamber. The test gas forms a constant pressure difference (adjustable) between the two test chambers (ie, both sides of the sample), and the test gas penetrates from the high pressure chamber to the low pressure chamber under the action of the pressure difference gradient, passing through the low pressure chamber The internal pressure is monitored to obtain the barrier properties of the sample.
At present, the standard for the detection method of oxygen permeation of plastic packaging mainly refers to GB/T1038-2000 "Phenomenon of Pressure Difference of Plastic Film and Sheet Gas Permeability Test Method".
3. Test equipment
3.1 Scope of application This paper uses the Labthink VAC-V2 differential pressure gas permeation instrument to test the oxygen permeation of peanut window-opening bags.
(1) This equipment is specially used for testing the gas permeability, permeability coefficient, solubility coefficient and diffusion coefficient of various film and sheet samples at various temperatures.
Film type: such as various plastic film, plastic composite film, paper-plastic composite film, co-extruded film, aluminized film, aluminum foil, aluminum foil composite film and other film-like materials.
Sheets: such as various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet.
(2) This equipment can also be extended to aerospace materials, paper and paperboard, paint film, fiberglass cloth, glass fiber paper, cosmetic hose sheets, various rubber sheets and other materials for gas permeability testing.
(3) This equipment is suitable for the permeability test of various gases, such as oxygen, carbon dioxide, nitrogen, helium, air, etc.
(4) This equipment meets many national and international standards, such as GB/T1038, ISO15105-1, ISO2556, ASTMD1434, JISK7126-1, YBB00082003.
3.2 Equipment parameters (1) The normal test range of the equipment is 0.05~50,000cm3/m2·24h·0.1MPa, which can be extended to 500,000cm3/m2·24h·0.1MPa, and the vacuum resolution can reach 0.1Pa.
(2) The temperature control range of the equipment is 5°C~95°C, the temperature control accuracy is ±0.1°C; the humidity control range is 0%RH, 2%RH~98.5%RH, 100%RH, and the humidity control precision is ±1%. RH can meet the testing requirements of different test conditions of samples.
(3) This equipment has three completely independent test chambers, which can test three identical or different samples at the same time.
(4) This equipment can be used to fit data at any temperature, and the test results under extreme test conditions can be easily obtained.
(5) After the system is modified, the equipment can also support the testing of toxic gases and flammable and explosive gases.
(6) This equipment provides standard film for rapid calibration to ensure the accuracy and versatility of the test data.
(7) The equipment supports the LystemTM laboratory data sharing system to uniformly manage test results and test reports.
Figure 2VAC-V2 differential pressure gas permeation meter
4, test conditions <br> <br> Location: Labthink packaging safety testing center tests temperature and humidity: 23 ℃, 0% RH
Test method: differential pressure method 5. Test procedure (1) Three specimens having a diameter of 97 mm were cut from the surface of the window portion of the peanut packaging sample by a special cutter.
(2) Evenly apply a layer of vacuum grease along the periphery of the three sample chambers of the equipment. Note that the vacuum grease should not contaminate the test area, and then place a filter paper with a diameter of 65 mm in the test area.
(3) Three samples were clamped to three test chambers.
Figure 3 sample clamping process
(4) Set the test temperature, humidity, sample thickness and other parameter information, open the vacuum pump, water bath temperature control device, click the start test option, the test begins.
(5) The instrument automatically calculates the test results based on the monitoring of the pressure in the low pressure chamber.
(6) According to the step (1), three pieces of the sample are cut out from the non-opening area of ​​the sample, that is, the printing area, and then the detection is performed according to the steps (2) to (5).
6, test results
The average test results of the oxygen permeation amount in the sample window opening area and the printing area were 72.408 cm 3 /m 2 • 24 h • 0.1 MPa, 66.488 cm 3 /m 2 • 24 h • 0.1 MPa, respectively. ?
7, using the summary <br> <br> VAC-V2 Gas Permeability meter test windowed plastic bags when the amount of oxygen transmission can acquire stable and accurate results of oxygen barrier properties, the packaging material can be assessed correctly fenestration The barrier properties of each zone can effectively filter the packaging materials and determine the window opening method. The testing equipment and inspection standards used in this scheme are also applicable to the oxygen transmission test of other soft plastic composite membrane materials. 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 about the relevant testing instruments, you can visit Jinan Languang for specific information or call us. Labthink is looking forward to enhancing technical exchanges and cooperation with enterprises and institutions in the industry.
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