Device for measuring oxygen permeability of packaging material

Abstract

The utility model relates to the technical field of oxygen permeability determination, and discloses a packaging material oxygen permeability determination device which comprises a test gas container, a carrier gas container and a test sample. According to the device for measuring the oxygen permeability of the packaging material, test gas is disturbed through the wave-shaped guide plate, carrier gas is uniformly dispersed in combination with the porous splitter plate, so that oxygen and nitrogen fully cover the surface of a test sample, a gas path is prolonged in cooperation with the barrier plate, the flow velocity difference is effectively reduced, and the oxygen migration amount is detected in real time by adopting the coulomb electric quantity sensor; a humidity regulator and an electric heating sheet are integrated; accurate control of temperature and humidity is supported; testing of humidity sensitive materials such as EVOH is adapted; an elastic loading pressing plate is linked with a telescopic spring through a sliding rod and is adapted to samples with different thicknesses such as films and bottle bodies; and the first inner sealing ring, the second inner sealing ring and the outer sealing ring are combined, so that the sealing performance is improved.

Description

Technical Field

[0001] This application relates to the field of oxygen permeability measurement technology, specifically to a device for measuring the oxygen permeability of packaging materials. Background Technology

[0002] Food and medicine are commodities closely related to people's health. The packaging of these products not only needs to be aesthetically pleasing and convenient, but more importantly, it must ensure the stable and reliable quality of the contents throughout their shelf life. Therefore, choosing packaging with barrier properties is crucial to ensuring food and medicine safety. The barrier properties of packaging materials are specific to a particular permeable substance; they refer to the material's ability to prevent a particular substance from permeating from one side to the other.

[0003] An existing patent (publication number: CN202854017U) discloses an oxygen permeability measuring device based on the isobaric method, which has a simple structure, more accurate test results, and can effectively ensure the integrity of the test sample. It includes a test container, a sensor, and a sealing ring. The test container has a sealed chamber in the middle. The test container has a clamping part for fixing the test sample in the sealed chamber. The fixed test sample divides the sealed chamber into an independent test gas chamber and a carrier gas chamber. The test container is provided with a test gas inlet pipe and a test gas outlet pipe that communicate with the test gas chamber, and a carrier gas inlet pipe and a carrier gas outlet pipe that communicate with the carrier gas chamber. The sensor is set in the carrier gas outlet pipe. The test container includes an upper container and a lower container that are joined together. The clamping part is formed at the joint of the upper container and the lower container. The clamping part is a smooth plane. The sealing ring is set at the contact position between the test sample and the test container.

[0004] The device in the aforementioned comparative document uses a separate design for the test gas chamber and the carrier gas chamber, and uses a sensor to detect the oxygen concentration. However, it still has shortcomings in actual use. The single position of the air inlet pipe leads to inconsistent gas flow rates on the surface of the test sample, affecting the accuracy of the permeation rate measurement. It also lacks an integrated temperature and humidity control module, making it impossible to test the changes in oxygen permeability of materials (such as EVOH) under different humidity levels. To solve the above problems, a device for measuring the oxygen permeability of packaging materials is proposed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a device for measuring the oxygen permeability of packaging materials, which enables the gas to cover the test sample more evenly and allows for adjustment and control of the temperature and humidity of the test environment, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: an oxygen permeability measuring device for packaging materials, comprising a test gas container, a carrier gas container, and a test sample. A test gas inlet pipe is installed at the top of the test gas container, and a carrier gas inlet pipe and a carrier gas outlet pipe are installed at the bottom of the carrier gas container. A coulombic charge sensor is installed at the bottom end of the carrier gas outlet pipe. A data processing component electrically connected to the coulombic charge sensor is fixedly connected to the bottom surface of the carrier gas container. A humidity regulator is installed on a section of the test gas inlet pipe. Electric heating elements are embedded in the inner walls of both the test gas container and the carrier gas container. A corrugated guide plate is installed at the end of the test gas inlet pipe, and a porous diverter plate is installed at the end of the carrier gas inlet pipe. A barrier plate is fixedly connected to the inner wall of the test gas container, and an elastic loading pressure plate is installed at the bottom of the test gas container.

[0007] The above scheme uses a wave-shaped guide plate to agitate the test gas, combined with a porous flow divider to evenly disperse the carrier gas, ensuring that oxygen and nitrogen fully cover the surface of the test sample. A barrier plate extends the gas path, effectively reducing flow rate differences. A coulombic charge sensor detects oxygen migration in real time, and a data processing component automatically calculates the oxygen permeability, reducing the error rate. An integrated humidity regulator and electric heating element support precise temperature and humidity control, making it suitable for testing humidity-sensitive materials such as EVOH. The elastic loading plate can meet the testing needs of samples of different thicknesses, such as films and bottles, and the clamping force is adjustable.

[0008] Furthermore, the test gas container and the carrier gas container are connected by threads, and the test sample is located between the test gas container and the carrier gas container.

[0009] The above scheme defines the connection method between the test gas container and the carrier gas container, which allows the test sample to be conveniently positioned between the test gas container and the carrier gas container for oxygen permeability measurement.

[0010] Furthermore, a test gas outlet pipe is installed on the top of the test gas container, and the baffle plate is located on the side close to the test gas outlet pipe.

[0011] The above scheme allows for convenient side-view observation of gas exhaust through the designed test gas outlet pipe, defines the positional relationship between the baffle plate and the test gas outlet pipe, and can work in conjunction with the corrugated guide plate to form a composite airflow optimization structure of corrugated guidance and vertical flow restriction, thereby improving the uniformity of test gas coverage.

[0012] Furthermore, the inner wall of the test gas container is provided with four reserved cavities, and a sliding rod is slidably fitted on the inner wall of each reserved cavity. A telescopic spring is fixedly connected to the top of each sliding rod.

[0013] The above solution allows for easy limitation of the slide bar's position using a telescopic spring, thereby meeting the testing requirements of test samples of different specifications.

[0014] Furthermore, the top ends of the four telescopic springs are fixedly connected to the inner walls of the four reserved cavities, and the bottom ends of the four slide rods are fixedly connected to the upper surface of the elastic loading pressure plate.

[0015] Through the above scheme, the linkage design of four telescopic springs and slide bars enables the elastic loading pressure plate to adapt to test samples of different thicknesses, ensuring uniform pressure distribution while maintaining sealing, and improving test stability and repeatability.

[0016] Furthermore, the bottom surface of the elastic loading plate is a smooth surface, and the bottom surface of the elastic loading plate abuts against the upper surface of the test sample.

[0017] The above approach ensures uniform pressure distribution, avoids localized stress damage to the test sample, enhances sealing, prevents gas leakage, and guarantees test accuracy.

[0018] Furthermore, a first inner sealing ring is fixedly connected to the inner wall of the test gas container, and a second inner sealing ring is fixedly connected to the top of the carrier gas container. Both the first and second inner sealing rings are in contact with the test sample.

[0019] The above scheme improves the sealing effect between the test sample and the test gas container and carrier gas container by setting the first inner sealing ring and the second inner sealing ring, thereby improving the accuracy of the measurement results.

[0020] Furthermore, the bottom of the test gas container is provided with an outer sealing ring, which is located at the connection between the test gas container and the carrier gas container.

[0021] The above solution improves the sealing effect at the connection between the test gas container and the carrier gas container by using an external sealing ring.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] This packaging material oxygen permeability measuring device uses a corrugated guide plate to agitate the test gas, combined with a porous flow divider to evenly disperse the carrier gas, ensuring that oxygen and nitrogen fully cover the surface of the test sample. A barrier plate extends the gas path, effectively reducing flow rate differences. A coulomb sensor detects oxygen migration in real time, and a data processing component automatically calculates the oxygen permeability, reducing the error rate. An integrated humidity regulator and electric heating element support precise temperature and humidity control, making it suitable for testing humidity-sensitive materials such as EVOH. An elastic loading plate, linked to a sliding rod and a telescopic spring, is adaptable to samples of different thicknesses, such as films and bottles, with adjustable clamping force. Combined with a first inner sealing ring, a second inner sealing ring, and an outer sealing ring, it enhances sealing performance and reduces the probability of gas leakage. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this application;

[0025] Figure 2 This is a schematic diagram of the overall structure of this application;

[0026] Figure 3 This is a schematic diagram of the overall structure of this application;

[0027] Figure 4 This is a schematic diagram of the overall structure of this application;

[0028] Figure 5 This is a schematic diagram of the overall structure of this application.

[0029] In the picture:

[0030] 1. Test gas container; 2. Carrier gas container; 3. Test gas inlet pipe; 4. Test gas outlet pipe; 5. Carrier gas inlet pipe; 6. Carrier gas outlet pipe; 7. Coulomb charge sensor; 8. Data processing component; 9. Humidity regulator; 10. Electric heating element; 11. Corrugated guide plate; 12. Porous flow divider; 13. Barrier plate; 14. Test sample; 15. Reserved cavity; 16. Slide rod; 17. Telescopic spring; 18. Elastic loading pressure plate; 19. First inner sealing ring; 20. Second inner sealing ring; 21. Outer sealing ring. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Please see Figure 1 , Figure 2and Figure 3 This embodiment of an oxygen permeability measuring device for packaging materials includes a test gas container 1, a carrier gas container 2, and a test sample 14. The test gas container 1 and the carrier gas container 2 are connected by threads. The test sample 14 is located between the test gas container 1 and the carrier gas container 2, defining the connection method between them. This allows for convenient positioning of the test sample 14 between the test gas container 1 and the carrier gas container 2 for oxygen permeability measurement. A test gas inlet pipe 3 and a test gas outlet pipe 4 are installed at the top of the test gas container 1. The test gas outlet pipe 4 facilitates side observation of gas discharge. A carrier gas inlet pipe 5 and a carrier gas outlet pipe 6 are installed at the bottom of the carrier gas container 2.

[0033] Please see Figure 2 , Figure 3 and Figure 5 A coulombic flux sensor 7 is installed at the bottom of the carrier gas outlet pipe 6. This sensor detects the electrochemical reaction current of oxygen in the carrier gas in real time and calculates the oxygen migration rate by combining it with flow meter data. A data processing component 8, electrically connected to the coulombic flux sensor 7, is fixedly connected to the bottom of the carrier gas container 2. The data processing component 8 has a built-in algorithm that automatically calculates the oxygen permeability formula: OTR=Q / (A·t), where Q is the total oxygen volume, A is the sample area, and t is time. A humidity regulator 9 is installed on the section of the test gas inlet pipe 3. The test gas container... Both the inner walls of container 1 and container 2 are embedded with electric heating elements 10. A corrugated guide plate 11 is installed at the end of the test gas inlet pipe 3, and a porous diverter plate 12 is installed at the end of the carrier gas inlet pipe 5. A baffle plate 13 is fixedly connected to the inner wall of the test gas container 1. The baffle plate 13 is located on the side close to the test gas outlet pipe 4, which limits the positional relationship between the baffle plate 13 and the test gas outlet pipe 4. It can work in conjunction with the corrugated guide plate 11 to form a composite airflow optimization structure of corrugated guidance and vertical flow restriction, thereby improving the uniformity of test gas coverage.

[0034] Please see Figure 2 , Figure 3 and Figure 4The bottom of the test gas container 1 is equipped with an elastic loading plate 18. The inner wall of the test gas container 1 has four reserved cavities 15. A sliding rod 16 is slidably fitted onto the inner wall of each reserved cavity 15. A telescopic spring 17 is fixedly connected to the top of each sliding rod 16. The telescopic springs 17 allow for convenient limitation of the position of the sliding rod 16, thus meeting the testing requirements of test samples 14 of different specifications. The tops of the four telescopic springs 17 are fixedly connected to the inner walls of the four reserved cavities 15, and the bottoms of the four sliding rods 16 are fixedly connected to the inner walls of the four reserved cavities 15. The upper surface of the elastic loading plate 18 is fixedly connected to the linkage design of four telescopic springs 17 and slide rods 16, which enables the elastic loading plate 18 to adapt to test samples 14 of different thicknesses, ensuring uniform pressure distribution while maintaining airtightness, improving test stability and repeatability. The bottom surface of the elastic loading plate 18 is a smooth surface, and the bottom surface of the elastic loading plate 18 abuts against the upper surface of the test sample 14, which can ensure uniform pressure distribution, avoid local stress damage to the test sample 14, enhance airtightness, prevent gas leakage, and ensure test accuracy.

[0035] Please see Figure 1 , Figure 2 and Figure 4 The inner wall of the test gas container 1 is fixedly connected with a first inner sealing ring 19, and the top of the carrier gas container 2 is fixedly connected with a second inner sealing ring 20. Both the first inner sealing ring 19 and the second inner sealing ring 20 are in contact with the test sample 14. The first inner sealing ring 19 and the second inner sealing ring 20 can improve the sealing effect between the test sample 14 and the test gas container 1 and the carrier gas container 2, thereby improving the accuracy of the measurement results. The bottom of the test gas container 1 is provided with an outer sealing ring 21, which is located at the connection between the test gas container 1 and the carrier gas container 2. The outer sealing ring 21 can improve the sealing effect at the connection between the test gas container 1 and the carrier gas container 2.

[0036] In this embodiment, an oxygen permeability measuring device for packaging materials uses a corrugated guide plate 11 to agitate the test gas, combined with a porous distribution plate 12 to evenly disperse the carrier gas, ensuring that oxygen and nitrogen fully cover the surface of the test sample 14. A barrier plate 13 extends the gas path, effectively reducing flow rate differences. A coulombic charge sensor 7 detects oxygen migration in real time, and a data processing component 8 automatically calculates the oxygen permeability, reducing the error rate. An integrated humidity regulator 9 and electric heating element 10 support precise temperature and humidity control, making it suitable for testing humidity-sensitive materials such as EVOH. An elastic loading plate 18 is linked to a sliding rod 16 and a telescopic spring 17, adapting to samples of different thicknesses such as films and bottles. The clamping force is adjustable. Combined with a first inner sealing ring 19, a second inner sealing ring 20, and an outer sealing ring 21, it improves the sealing performance and reduces the probability of gas leakage.

[0037] The working principle of the above embodiment is as follows: The test gas enters the test gas container 1 through the test gas inlet pipe 3. After being disturbed by the corrugated guide plate 11 installed at the end, it forms a uniformly distributed dynamic airflow covering the surface of the test sample 14. At the same time, the carrier gas is input through the carrier gas inlet pipe 5 and divided into multiple fine streams by the porous diverter plate 12, which uniformly fill the chamber of the carrier gas container 2 to ensure that the pressure in the two chambers is equal. During the test, oxygen permeates through the test sample 14 to the coulombic charge sensor 7 in the carrier gas outlet pipe 6 on the carrier gas side to detect the amount of oxygen migration in real time, generate an electrical signal and transmit it to the data processing component 8, and calculate the oxygen permeability OTR=Q / (A·t) through the algorithm. The humidity regulator 9 injects water vapor into the test gas, and the electric heating element 10 maintains the temperature of the chamber, dynamically simulating the actual storage environment. The elastic loading plate 18 is linked with the telescopic spring 17 through the slide rod 16 to adaptively adjust the clamping force to ensure the sealing of samples of different thicknesses. The first inner sealing ring 19, the second inner sealing ring 20, and the outer sealing ring 21 can further block gas leakage. The test gas container 1 and the carrier gas container 2 are quickly connected by threads. The barrier plate 13 extends the gas path and improves the contact efficiency. The entire system achieves high-precision, multi-scenario oxygen permeability measurement through the synergistic effect of airflow optimization, environmental control, and adaptive clamping.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A package material oxygen transmission rate measuring device comprising a test gas container (1), a carrier gas container (2) and a test sample (14), characterized by: The test gas container (1) is equipped with a test gas inlet pipe (3) at the top, and the carrier gas container (2) is equipped with a carrier gas inlet pipe (5) and a carrier gas outlet pipe (6) at the bottom. A coulomb charge sensor (7) is installed at the bottom end of the carrier gas outlet pipe (6). A data processing component (8) that is electrically connected to the coulomb charge sensor (7) is fixedly connected to the bottom surface of the carrier gas container (2). A humidity regulator (9) is installed on the pipe section of the test gas inlet pipe (3). Electric heating elements (10) are embedded in the inner walls of both the test gas container (1) and the carrier gas container (2). A corrugated guide plate (11) is installed at the end of the test gas inlet pipe (3). A porous diverter plate (12) is installed at the end of the carrier gas inlet pipe (5). A baffle plate (13) is fixedly connected to the inner wall of the test gas container (1). An elastic loading pressure plate (18) is installed at the bottom of the test gas container (1).

2. A package material oxygen transmission rate measuring apparatus according to claim 1, characterized by: The test gas container (1) and the carrier gas container (2) are connected by threads, and the test sample (14) is located between the test gas container (1) and the carrier gas container (2).

3. A package material oxygen transmission rate measuring apparatus according to claim 1, characterized by: The test gas container (1) is equipped with a test gas outlet pipe (4) on its top, and the baffle plate (13) is located on the side close to the test gas outlet pipe (4).

4. The apparatus of claim 1, wherein: The inner wall of the test gas container (1) is provided with four reserved cavities (15), and each reserved cavity (15) is slidably fitted with a slide rod (16) on its inner wall. Each slide rod (16) is fixedly connected to a telescopic spring (17) at its top end.

5. A package material oxygen transmission rate measuring apparatus according to claim 4, characterized by: The top ends of the four telescopic springs (17) are fixedly connected to the inner walls of the four reserved cavities (15), and the bottom ends of the four slide rods (16) are fixedly connected to the upper surface of the elastic loading plate (18).

6. A package material oxygen transmission rate measuring apparatus according to claim 1, characterized by: The bottom surface of the elastic loading plate (18) is a smooth surface, and the bottom surface of the elastic loading plate (18) abuts against the upper surface of the test sample (14).

7. The apparatus of claim 1, wherein: The inner wall of the test gas container (1) is fixedly connected with a first inner sealing ring (19), and the top of the carrier gas container (2) is fixedly connected with a second inner sealing ring (20). Both the first inner sealing ring (19) and the second inner sealing ring (20) are in contact with the test sample (14).

8. The apparatus of claim 1, wherein: The bottom end of the test gas container (1) is provided with an outer sealing ring (21), which is located at the connection between the test gas container (1) and the carrier gas container (2).

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