Fixture and detection mechanism for high-throughput test of film transmittance

Abstract

The utility model discloses a clamp and a detection mechanism for high-flux test of film transmittance, which comprises an upper cavity and a lower cavity, and the upper cavity and the lower cavity are enclosed to form a detection cavity; the device further comprises an equally-divided clamp, and the equally-divided clamp is placed between the upper cavity and the lower cavity during detection. In the equally-divided clamp, to-be-detected films are located on the same horizontal plane, and the areas of the to-be-detected films located in the equally-divided clamp are equal. The upper cavity and the lower cavity are combined to form the sealed detection cavity, so that the interference of external factors can be effectively isolated; through the design of the equally-divided clamp, a plurality of film samples with the same area can be simultaneously placed in the same horizontal plane to be detected, so that the test condition of each film is ensured to be consistent, the experiment efficiency is improved, the operation error is reduced, and when a large number of samples are detected, the detection cost of detection equipment is not increased and the detection precision is ensured, and meanwhile, the detection efficiency is improved. The test efficiency is improved, and high-throughput detection of the thin film is realized.

Description

Technical Field

[0001] This utility model belongs to the field of packaging film testing, and in particular relates to a fixture and testing mechanism for high-throughput testing of film transmittance. Background Technology

[0002] In the packaging industry, the barrier properties of packaging materials are a key factor in ensuring product quality and extending shelf life. Because many products are highly sensitive to changes in the external environment, especially the effects of water vapor and oxygen, the protective performance of packaging materials directly affects the stability and safety of the product. Specifically, water vapor or oxygen can react with the components inside the product through the permeation or diffusion of packaging materials, leading to aging, spoilage, oxidation, and even microbial growth. For example, some foods are prone to oxidation in the presence of oxygen, resulting in nutrient loss, color changes, and even a deterioration in taste; while water vapor penetration can cause food to become damp, reducing its texture and even causing mold growth.

[0003] Testing the gas permeability of packaging materials is therefore particularly important. In existing testing equipment, the fixture is typically a cavity with a fixed area, clamping one film at a time. Software is used to calculate and measure the gas permeability per square meter of the film. Since each fixture can only test one sample at a time, testing efficiency is very low when there are many samples. Adding test fixtures to the testing equipment would require additional piping and valves, significantly increasing the equipment cost.

[0004] Chinese patent document CN116106199A discloses a gas permeability testing system for testing films and packaging containers, including an upper testing chamber, a moving mechanism, a lower testing chamber, and a packaging container testing plate. The upper testing chamber can move closer to the lower testing chamber with the assistance of the moving mechanism, so that the upper testing chamber and the lower testing chamber can be connected to perform film sample testing. The upper testing chamber can also move away from the lower testing chamber with the assistance of the moving mechanism, so that the packaging container testing plate and the lower testing chamber can be connected to perform packaging container testing.

[0005] While the above technical solution can meet the testing needs of both film material samples and packaging container samples by arranging film testing components and packaging container testing components, thus reducing usage costs and improving testing efficiency while ensuring testing accuracy, a problem arises in actual use: because each fixture can only test one sample at a time, testing efficiency is low when there are many samples.

[0006] Therefore, it is necessary to develop a new fixture and testing mechanism for testing the transmittance of thin films. When testing a large number of samples, it is possible to improve testing efficiency without increasing the cost of testing equipment and ensuring testing accuracy, thereby achieving high-throughput testing of thin films. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a high-throughput test fixture for thin film transmittance that can improve testing efficiency while ensuring testing accuracy and without increasing the cost of testing equipment when testing a large number of samples.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a fixture and detection mechanism for high-throughput testing of film transmittance, including an upper cavity and a lower cavity, wherein the upper cavity and the lower cavity together form a detection cavity; and further including an equal-dividing fixture, which is placed between the upper cavity and the lower cavity during detection; in the equal-dividing fixture, the films to be tested are on the same horizontal plane, and the areas of the films to be tested located in the equal-dividing fixture are equal.

[0009] The combination of the upper and lower cavities forms a sealed testing cavity, effectively isolating external interference and ensuring a consistent testing environment. This structure ensures that the film sample can withstand uniform testing gas or other external environments during testing, eliminating errors caused by environmental differences. The equally spaced fixture design allows multiple film samples to be placed simultaneously on the same horizontal plane for testing, with each film having an equal area. This ensures consistent testing conditions for each film and prevents the test results from being affected by positional deviations. This improves experimental efficiency and reduces operational errors, enabling the equipment to perform high-throughput testing of films without increasing equipment costs and while maintaining testing accuracy.

[0010] Preferably, the outer edge of the equal-dividing fixture is in contact with the inner edge of the detection cavity; the film to be tested includes n films, and the equal-dividing fixture is provided with n equal-dividing compartments with the same number and area as the n films to be tested.

[0011] The shape matching of the equally spaced clamps and the testing cavity ensures the airtightness during the film testing process; the design of the equally spaced clamping chambers ensures that each film is evenly distributed in the equally spaced clamps, and the clamping force and fixing effect are completely consistent. Through precise design, these equally spaced clamping chambers enable each film to be evenly clamped and the physical force on each film to be completely balanced, which can effectively prevent film deformation or uneven force due to uneven clamping and improve the accuracy of transmittance testing.

[0012] Preferably, a sealing strip is provided between each of the adjacent equally divided compartments.

[0013] The sealing strip effectively prevents the films in adjacent equal compartments from interfering with each other, ensuring that each film can maintain an independent and stable state in the fixture. During the test, the film may be affected by factors such as external airflow, temperature changes, or improper operation. The function of the sealing strip is to seal the gap between adjacent equal compartments, preventing external air or impurities from entering, thereby minimizing the impact of the external environment on the film test results and improving the test accuracy.

[0014] Preferably, the upper surface of the upper cavity is provided with an upper air inlet valve, and the center of the lower surface of the upper cavity is recessed inward to form a first recessed cavity. A sealing ring is provided on the outer edge of the first recessed cavity, and the sealing ring can be tightly engaged with the equal-dividing clamp. An upper air inlet is also provided in the first recessed cavity, and the upper air inlet is symmetrically distributed on both sides of the axis of the first recessed cavity.

[0015] The function of the upper air inlet valve is to provide airflow regulation for the upper cavity, allowing gas (water vapor or oxygen) to be introduced into the upper cavity as needed and controlling the gas flow rate. In film transmittance testing, it can effectively regulate air pressure and airflow, thereby providing a stable working environment for the film. The design of the first recessed cavity allows the upper cavity to better accommodate the equal-division fixture, providing a precise space for placing the film fixture. The main function of the sealing ring is to provide good sealing performance. The sealing ring is tightly engaged with the equal-division fixture, effectively preventing the leakage of gas or other media during the test, maintaining the airflow stability inside the cavity, and preventing unnecessary influence of the external environment on the film, thereby ensuring the consistency of test conditions. The upper air inlet holes are designed on both sides of the axis of the first recessed cavity and are symmetrically distributed. This design not only ensures uniform airflow distribution but also allows for more precise adjustment of the gas flow rate in the upper cavity. The symmetrical distribution of the air inlets helps maintain the balance of airflow inside the upper cavity, allowing the airflow entering the upper cavity to be evenly distributed around the equal-division fixture and the film. By adjusting the airflow through the air inlet, the testing environment can be further optimized, avoiding film deformation or unstable clamping caused by uneven airflow, while improving the accuracy of film transmittance testing.

[0016] Preferably, a lower air inlet valve is provided on the outer periphery of the lower cavity, and the upper surface of the lower cavity contracts inward at the center to form a second recessed cavity. The second recessed cavity has the same shape as the first recessed cavity, and the first recessed cavity and the second recessed cavity together form the detection cavity; a lower air inlet hole is provided in the second recessed cavity.

[0017] Preferably, a gas sensor is also provided in the lower cavity.

[0018] The lower inlet valve is used to introduce the comparison gas. The lower inlet valve and the lower inlet work together to control the flow of gas in the lower chamber, ensuring that changes in gas concentration during the test are caused by oxygen or water vapor passing through the membrane into the upper chamber, rather than by other factors (such as gas leakage or other interference). At the same time, the introduction of the comparison gas also helps to maintain stable gas pressure inside the lower chamber, further improving the accuracy of the test. The gas sensor is used to monitor the membrane's permeability to oxygen or water vapor in real time, ensuring the accuracy of the membrane transmittance test.

[0019] Preferably, the upper cavity and the lower cavity are connected by a hinge and can be opened and closed freely, and a fixing device is also provided between the upper cavity and the lower cavity.

[0020] This design gives the device a high degree of flexibility and operability. The hinged connection allows the upper and lower chambers to be easily opened or closed as needed, facilitating equipment maintenance, cleaning, and the placement and replacement of the membrane. The main function of the fixing device is to ensure that the upper and lower chambers are firmly fixed together in the closed state, preventing loosening or cracking of the chambers due to air pressure changes or external forces during testing. The fixing device provides precise locking force, making the connection between the upper and lower chambers more secure, improving airtightness and stability during the testing process, and increasing testing efficiency.

[0021] Preferably, the fixing device includes a mounting block, a first adjusting bolt, a first adjusting knob, a fixing plate, a second adjusting bolt, and a second adjusting knob. The first adjusting bolt is disposed inside the mounting block, and the first adjusting knob is disposed on the first adjusting bolt. The mounting block is connected to the fixing plate, and the fixing plate is connected to the mounting block by a hinge. The second adjusting bolt is disposed inside the fixing plate, and the second adjusting knob is connected to the second adjusting bolt.

[0022] Preferably, the lower cavity is provided with a slot, and the fixing plate can be snapped into the slot.

[0023] The mounting block, as the basic support component for fixing the equipment, serves to connect and secure other adjustment components. The first adjustment bolt within the mounting block allows for fine-tuning of the fixing equipment; its tightness can be adjusted using the first adjustment knob. By adjusting the tightness of the first adjustment bolt, the operator can precisely control the contact pressure or position between the upper and lower cavities. The hinged connection design makes the opening and closing of the upper and lower cavities more flexible, facilitating quick placement or replacement of the film fixture before and after testing. By rotating the second adjustment knob, the operator can adjust the contact pressure or position between the fixing plate and the lower cavity, ensuring a uniform pressure distribution throughout the fixing equipment during testing and preventing airtightness issues due to insecure fixing. The slot and fixing plate locking mechanism accurately locks the fixing plate within the slot, preventing loosening or displacement during testing. These adjustment functions can be optimized according to different film types and testing requirements to obtain the most ideal testing environment and improve testing accuracy.

[0024] Preferably, the testing mechanism of the fixture includes a testing platform, the fixture for high-throughput testing of film transmittance is disposed in the testing platform, the testing platform is connected to an air inlet pipe, and the air inlet pipe connects the fixture to a gas cylinder; the testing mechanism also includes an external computer, which is connected to the testing platform.

[0025] The testing platform is the core support platform of the entire testing system, providing a stable and flat working environment. The inlet pipe, as the main channel for gas delivery, ensures the stability and reliability of gas flow during testing. By precisely controlling the gas flow in the inlet pipe, it can be ensured that the membrane receives a constant and adjustable gas pressure during testing. The gas cylinder, as the storage and supply source of the gas, is usually pre-filled with the required test gas. This gas is delivered to the fixture on the testing platform through the inlet pipe and then transferred to the testing cavity through the fixture for transmittance testing. The external computer is the key part for operator interaction with the equipment, used to adjust and monitor the gas flow rate in the inlet pipe of the gas cylinder. Attached Figure Description

[0026] The following is a detailed description of the embodiments of this utility model in conjunction with the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the fixture used for high-throughput testing of film transmittance when it is open. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the equal-division fixture;

[0029] Figure 3 This is a cross-sectional schematic diagram of the clamps used for high-throughput testing of film transmittance when they are closed.

[0030] Figure 4 This is a schematic diagram of the clamping structure when the clamps for high-throughput testing of film transmittance are engaged. Figure 1 ;

[0031] Figure 5 This is a schematic diagram of the clamping structure when the clamps for high-throughput testing of film transmittance are engaged. Figure 2 ;

[0032] Figure 6 This is a structural diagram of the testing organization;

[0033] Wherein: 1-Upper cavity, 2-Lower cavity, 3-Detection cavity, 4-Divided clamp, 5-Outer perimeter, 6-Inner perimeter, 7-Divided clamping compartment, 8-Sealing strip, 9-Upper air inlet valve, 10-First recessed cavity, 11-Sealing ring, 12-Upper air inlet, 13-Lower air inlet valve, 14-Second recessed cavity, 15-Lower air inlet, 16-Fixed equipment, 17-Mounting block, 18-First adjusting bolt, 19-First adjusting knob, 20-Fixed plate, 21-Second adjusting bolt, 22-Second adjusting knob, 23-Slot, 24-Detection table, 25-Air inlet pipe, 26-Gas cylinder, 27-External computer. Detailed Implementation

[0034] As attached Figure 1-6 As shown, this embodiment of a fixture and detection mechanism for high-throughput testing of film transmittance includes an upper cavity 1 and a lower cavity 2, which together form a detection cavity 3. The feature is that it further includes a dividing fixture 4, which is placed between the upper cavity 1 and the lower cavity 2 during testing. In the dividing fixture 4, the films to be tested are on the same horizontal plane, and the areas of the films to be tested within the dividing fixture 4 are equal. The dividing fixture 4 is detachably installed between the upper cavity 1 and the lower cavity 2.

[0035] Specifically, such as Figure 2 , Figure 3 As shown, the outer edge 5 of the equal-dividing fixture 4 is in contact with the inner edge 6 of the detection cavity 3; the film to be tested includes n films, and the equal-dividing fixture 4 is provided with n equal-dividing compartments 7 of the same area as the number of the n films to be tested; in this embodiment, there are four films to be tested, and the equal-dividing fixture is provided with four equal-dividing compartments 7 of the same area; a sealing strip 8 is provided between adjacent equal-dividing compartments 7.

[0036] like Figure 1 , Figure 4As shown, an upper air inlet valve 9 is provided on the upper surface of the upper cavity 1, and a first recessed cavity 10 is formed by the inward recess at the center of the lower surface of the upper cavity 1. A sealing ring 11 is provided on the outer edge of the first recessed cavity 10, and the sealing ring 11 can be tightly engaged on the equal-dividing clamp 4. An upper air inlet hole 12 is also provided in the first recessed cavity 10, and the upper air inlet holes 12 are symmetrically distributed on both sides of the axis of the first recessed cavity 10.

[0037] A lower air inlet valve 13 is provided on the outer periphery of the lower cavity 2. The upper surface of the lower cavity 2 contracts inward to form a second recessed cavity 14. The second recessed cavity 14 has the same shape as the first recessed cavity 10. The first recessed cavity 10 and the second recessed cavity 14 together form the detection cavity 3. A lower air inlet 15 is provided in the second recessed cavity 14. A gas sensor is also provided in the lower cavity 2.

[0038] Specifically, such as Figure 1 , Figure 5 As shown, the upper cavity 1 and the lower cavity 2 are connected by a hinge and can be opened and closed freely. A fixing device 16 is also provided between the upper cavity 1 and the lower cavity 2.

[0039] The fixing device 16 includes a mounting block 17, a first adjusting bolt 18, a first adjusting knob 19, a fixing plate 20, a second adjusting bolt 21, and a second adjusting knob 22. The mounting block 17 is provided with the first adjusting bolt 18, and the first adjusting knob 19 is provided on the first adjusting bolt 18. The mounting block 17 is connected to the fixing plate 20, and the fixing plate 20 is connected to the mounting block 17 by a hinge. The fixing plate 20 is provided with the second adjusting bolt 21, and the second adjusting knob 22 is connected to the second adjusting bolt 21. The lower cavity 2 is provided with a slot 23, and the fixing plate 20 can be snapped into the slot 23.

[0040] like Figure 6 As shown, the testing mechanism includes a testing platform 24, and the fixture for high-throughput testing of film transmittance is set inside the testing platform 24. The testing platform 24 is connected to an air inlet pipe 25, which connects the fixture to a gas cylinder 26. The testing mechanism also includes an external computer 27, which is connected to the testing platform 24 and is used to control the gas flow rate input into the air inlet pipe 25 from the gas cylinder 26.

[0041] In practical use, it is first necessary to check the integrity and working status of all components, ensuring that the upper cavity 1, lower cavity 2, equal-dividing clamp 4, sealing strip 8, air intake system, and other components are intact and without obvious damage or leakage. Then, select the film material to be tested and prepare the corresponding number of samples. Ensure that the film material is flat and without obvious damage. After dividing the film sample, place it evenly in the equal-dividing clamping chamber 7 within the equal-dividing clamp 4. Each equal-dividing clamping chamber 7 is used to hold one film sample. Note that each film should have a consistent area and uniform thickness. Fix each film sample firmly to ensure that it is secure and does not loosen, and avoid sample displacement or loosening during the test.

[0042] Check the sealing between the upper cavity 1 and the lower cavity 2, confirming that the sealing ring 11 and sealing strip 8 are not aged or damaged, and ensuring that there is no gas leakage. Ensure that the gas cylinder 26 has sufficient gas and that the gas type meets the experimental requirements. Connect the inlet pipe 25 and connect the inlet pipe to the inlet valve 9 of the upper cavity 1. Ensure that the gas flow control system is working properly. Start the external computer 27, set the gas flow rate and gas pressure, and ensure that the inlet system starts normally. Ensure that the gas flow rate and pressure entering the test cavity 3 meet the experimental standards. Use the fixing device 16 to adjust and ensure that the equidistant clamp 4 placed between the upper cavity 1 and the lower cavity 2 is stable and tight. According to the test requirements, adjust the distance between the upper cavity 1 and the lower cavity 2 by adjusting the first adjusting bolt 18, the first adjusting knob 19, the second adjusting bolt 21, and the second adjusting knob 22 to ensure that the equidistant clamp 4 is fixed between the upper cavity 1 and the lower cavity 2 and does not loosen, thus ensuring airtightness.

[0043] The external computer 27 is turned on, and the gas flow control system is activated. Gas from the gas cylinder 26 is directed into the upper chamber 1 and lower chamber 2. The external computer 27 regulates the gas flow rate to ensure that the flow rate and pressure meet predetermined standards. During the test, the gas sensor monitors the gas flow rate and permeability in real time. The external computer 27 records parameters such as gas flow rate, pressure, and permeability, and displays them on the computer. The permeability data for each membrane is recorded individually for subsequent data analysis.

[0044] After testing, shut down the gas flow control system and stop the gas flow input. Close the valve of gas cylinder 26 to ensure the safety of the gas supply system. Open the upper chamber 1 and lower chamber 2, remove the dividing clamp 4, carefully remove the membrane sample, check the membrane for integrity, and record the test results for each membrane. Clean the inside and outside of the equipment with appropriate cleaning tools, especially the sealing strip and air inlet. Ensure all sealing components are in good condition before the next use to avoid contamination.

[0045] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fixture for high-throughput testing of thin film transmittance, comprising an upper cavity and a lower cavity, wherein the upper cavity and the lower cavity together form a detection cavity; characterized in that, It also includes a dividing fixture, which is placed between the upper cavity and the lower cavity during testing; in the dividing fixture, the films to be tested are on the same horizontal plane, and the areas of the films to be tested in the dividing fixture are equal.

2. The fixture for high-throughput testing of film transmittance according to claim 1, characterized in that, The outer edge of the equal-division fixture is in contact with the inner edge of the detection cavity; the film to be tested includes n films, and the equal-division fixture is provided with n equal-division compartments of the same area as the number of the n films to be tested.

3. The fixture for high-throughput testing of film transmittance according to claim 2, characterized in that, Sealing strips are provided between adjacent equally divided compartments.

4. The fixture for high-throughput testing of film transmittance according to claim 1, characterized in that, An upper air inlet valve is provided on the upper surface of the upper cavity. The center of the lower surface of the upper cavity is recessed inward to form a first recessed cavity. A sealing ring is provided on the outer edge of the first recessed cavity. The sealing ring can be tightly engaged with the equal-dividing clamp. An upper air inlet is also provided in the first recessed cavity. The upper air inlets are symmetrically distributed on both sides of the axis of the first recessed cavity.

5. The fixture for high-throughput testing of film transmittance according to claim 4, characterized in that, The lower cavity is provided with a lower air inlet valve on its outer periphery. The upper surface of the lower cavity contracts inward at the center to form a second recessed cavity. The second recessed cavity has the same shape as the first recessed cavity. The first recessed cavity and the second recessed cavity together form the detection cavity. The second recessed cavity is provided with a lower air inlet.

6. The fixture for high-throughput testing of film transmittance according to claim 1, characterized in that, A gas sensor is also installed in the lower cavity.

7. The fixture for high-throughput testing of film transmittance according to claim 1, characterized in that, The upper cavity and the lower cavity are connected by a hinge and can be opened and closed freely. A fixing device is also provided between the upper cavity and the lower cavity.

8. The fixture for high-throughput testing of film transmittance according to claim 7, characterized in that, The fixing device includes a mounting block, a first adjusting bolt, a first adjusting knob, a fixing plate, a second adjusting bolt, and a second adjusting knob. The first adjusting bolt is disposed inside the mounting block, and the first adjusting knob is disposed on the first adjusting bolt. The mounting block is connected to the fixing plate, and the fixing plate is connected to the mounting block by a hinge. The second adjusting bolt is disposed inside the fixing plate, and the second adjusting knob is connected to the second adjusting bolt.

9. The fixture for high-throughput testing of film transmittance according to claim 8, characterized in that, The lower cavity is provided with a slot, and the fixing plate can be snapped into the slot.

10. A testing mechanism having a fixture for high-throughput testing of film transmittance as described in any one of claims 1-9, characterized in that, The testing apparatus includes a testing platform, in which a fixture for high-throughput testing of film transmittance is disposed. The testing platform is connected to an air inlet pipe, which connects the fixture to a gas cylinder. The testing apparatus also includes an external computer, which is connected to the testing platform.

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