Water vapor transmittance testing device for ultrahigh-barrier film
By designing a water vapor transmission rate test device for ultra-high barrier films and combining it with oxygen permeability and resistance detection structures, the problem that traditional devices cannot accurately detect bending deformation is solved, achieving more efficient detection results.
Patent Information
- Application Number
- CN202421505384.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-06-27
AI Technical Summary
Traditional silicon oxide high-barrier membrane testing equipment can only test air permeability and cannot accurately detect bending deformation, resulting in low testing efficiency.
A water vapor transmission rate testing device for ultra-high barrier films was designed, which includes an oxygen permeability detection structure and a resistance detection structure. The oxygen permeability is measured by applying pressure through a piston and a weight, and the resistivity is measured in a bent state using an elastic membrane and an electrode rod. The combination of these two methods improves detection accuracy.
The gas permeability and oxygen permeability of the silicon oxide high barrier membrane in a bent and deformed state are tested, thereby improving the accuracy and efficiency of the test.
Smart Images
Figure CN223332851U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ultra-high barrier film testing, in particular to a device for testing the water vapor transmission rate of an ultra-high barrier film. Background Art
[0002] Silica high barrier film is mainly used for packaging bag products. In the stretch film packaging process, the product is generally placed 5-10mm higher than the stretching plane of the lower film. During the vacuum process, the upper film is forced to stretch. Different products have different degrees of deformation. Tracking tests are required to ensure that the barrier properties of the upper film after deformation meet the use requirements.
[0003] However, the traditional silicon oxide high barrier membrane testing device is relatively simple and can only test the air permeability of the silicon oxide high barrier membrane. It cannot test the silicon oxide high barrier membrane when it is bent and deformed, resulting in the silicon oxide high barrier membrane detection efficiency being not accurate enough.
[0004] Therefore, a device for testing the water vapor transmission rate of ultra-high barrier films is provided to solve the problems raised in the above background technology. Utility Model Content
[0005] The purpose of the utility model is to provide a water vapor transmission rate testing device for ultra-high barrier films to solve the problems raised in the above background technology.
[0006] To achieve the above objectives, the present invention provides the following technical solutions:
[0007] A water vapor transmission rate testing device for an ultra-high barrier film comprises a working plate, on which an oxygen permeability detection structure and a resistance detection structure are mounted, the oxygen permeability detection structure comprising an oxygen box, a sliding tube fixed on the upper side of the oxygen box and connected therethrough, a piston slidably connected inside the sliding tube, a sliding rod fixedly connected to the upper side of the piston, a weight plate fixedly connected to the upper side of the sliding rod, a fixed tube fixedly on the upper side of the oxygen box and connected therethrough, a mounting tube fixedly on the upper side of the fixed tube and connected therethrough, a film to be tested being fitted on the mounting tube,
[0008] As a further solution of the present invention: wherein, a sleeve is provided on the upper side of the membrane to be detected, a steam vent is opened on the sleeve, and the sleeve is spirally connected to the installation pipe.
[0009] As a further solution of the present invention: wherein, the resistance detection structure includes an air storage box, a test slot is provided on the air storage box, a test hole is provided on the test slot, an elastic membrane is laid inside the test hole, and an electrode rod is installed inside the test slot.
[0010] As a further solution of the present invention: wherein, an air inlet pipe and an air outlet pipe are fixed to and connected through the air storage box and the oxygen box, and valves are installed on the air inlet pipe and the air outlet pipe.
[0011] As a further solution of the present invention: wherein, a glass tube is fixed on and connected through the oxygen box, a marking block is slidably connected inside the glass tube, and scale numbers are provided on the surface of the glass tube.
[0012] As a further solution of the present invention: wherein, a pressure sensor is installed inside the air storage box, and the pressure sensor is electrically connected to an external display screen.
[0013] Compared with the prior art, the beneficial effects of the present invention are:
[0014] When testing the silicon oxide high-barrier film, the silicon oxide high-barrier film is first boiled and printed to make the film to be tested suitable for actual use; then the treated film to be tested is covered on the installation tube (by bonding the silicon oxide high-barrier film to the tube mouth of the installation tube), and then oxygen is injected into the oxygen box through the air inlet pipe (it can also be mixed with other gases). The internal oxygen pressure of the oxygen box is maintained at a constant pressure state, that is, (the piston moves to the top layer of the sliding tube under pressure, and the marking block inside the glass tube moves to the initial position of the scale number), and then the oxygen injection is stopped. Then, weights are placed on the weight plate, and pressure is applied to the oxygen box through the weights, so that the marking block moves up inside the glass tube under pressure, and the height of the marking block movement is recorded. Then record the time, and observe the downward movement of the marker block at intervals of half an hour and one hour respectively. The oxygen permeability of the membrane to be tested can be calculated based on the downward movement distance of the marker block. After the test is completed, the membrane to be tested is removed and adhered to the elastic membrane, so that both sides of the membrane to be tested are connected to the electrode rod, and then gas is injected into the interior of the gas storage box to keep the internal pressure of the gas storage box at a state in which the middle of the elastic membrane is in a bulging state. When the elastic membrane bulges, the membrane to be tested will be in a bent state. Then the electrode rod is connected to an external digital source meter, and the air permeability of the membrane to be tested can be tested based on the change in resistivity when the test membrane is bent. The above two test methods of resistance detection and oxygen permeability detection can test the air permeability and oxygen permeability of the membrane to be tested, making the test results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0016] Figure 2 This is a schematic cross-sectional view of the oxygen tank structure in the utility model;
[0017] Figure 3 for Figure 2 A magnified schematic diagram of the structure in the middle;
[0018] Figure 4 This is a schematic cross-sectional view of the gas storage box structure in the utility model;
[0019] 1. Working plate; 2. Oxygen permeability detection structure; 201. Oxygen box; 202. Sliding tube; 203. Weight plate; 204. Sliding rod; 205. Piston; 206. Fixed tube; 207. Mounting tube; 208. Sleeve; 209. Glass tube; 210. Steam vent; 211. Marking block; 3. Membrane to be tested; 4. Resistance detection structure; 401. Gas storage box; 402. Test tank; 403. Test hole; 404. Elastic membrane; 405. Electrode rod; 407. Inlet pipe; 408. Outlet pipe; 409. Pressure sensor. DETAILED DESCRIPTION
[0020] See also Figures 1 to 4 : A water vapor transmission rate testing device for ultra-high barrier films, comprising a working plate 1, on which an oxygen permeability detection structure 2 and a resistance detection structure 4 are mounted, the oxygen permeability detection structure 2 comprising an oxygen box 201, a sliding tube 202 fixedly connected to the upper side of the oxygen box 201, a piston 205 slidably connected inside the sliding tube 202, a sliding rod 204 fixedly connected to the upper side of the piston 205, a weight plate 203 fixedly connected to the upper side of the sliding rod 204, a fixed tube 206 fixedly connected to the upper side of the oxygen box 201, a mounting tube 207 fixedly connected to the upper side of the fixed tube 206, a film to be tested 3 is fitted on the mounting tube 207,
[0021] Among them, the treated film to be tested 3 is covered on the installation tube 207 (by bonding the silicon oxide high barrier film to the tube mouth of the installation tube 207), and then oxygen (or other gases can be mixed) is injected into the oxygen box 201 through the air inlet pipe 407. The internal oxygen pressure state of the oxygen box 201 is maintained at a constant pressure state, that is, (the piston 205 moves to the top layer of the sliding tube 202 under the action of pressure, and the marking block 211 inside the glass tube 209 moves to the initial position of the scale number). Then, the injection of oxygen is stopped, and weights are placed on the weight plate 203. Pressure is applied to the oxygen box 201 by the weights, so that the marking block 211 moves up inside the glass tube 209 under the action of pressure. The height of the movement of the marking block 211 is recorded, and then the time is recorded. The downward movement of the marking block 211 is observed at intervals of half an hour and one hour respectively. The oxygen permeability of the film to be tested 3 can be calculated based on the downward movement distance of the marking block 211.
[0022] Preferably, a sleeve 208 is provided on the upper side of the membrane to be detected 3 , a steam vent 210 is opened on the sleeve 208 , and the sleeve 208 is spirally connected to the installation tube 207 .
[0023] The sleeve 208 can fix the position of the membrane 3 to be detected. The membrane 3 to be detected is pressed against the mounting tube 207 by the sleeve 208, so that the position of the membrane 3 to be detected will not be offset and the edge will not be warped.
[0024] Preferably, the resistance detection structure 4 includes an air storage box 401 , a test slot 402 is provided on the air storage box 401 , a test hole 403 is provided on the test slot 402 , an elastic membrane 404 is laid inside the test hole 403 , and an electrode rod 405 is installed inside the test slot 402 .
[0025] The membrane to be tested 3 is removed and adhered to the elastic membrane 404, with both sides of the membrane to be tested connected to the electrode rod 405. Then, gas is injected into the gas storage box 401 to keep the internal pressure of the gas storage box 401 at a value that causes the middle of the elastic membrane 404 to bulge. When the elastic membrane 404 bulges, the membrane to be tested 3 is bent. Then, the electrode rod 405 is connected to an external digital source meter. The air permeability of the membrane to be tested 3 can be tested based on the change in resistivity when the membrane to be tested 3 is bent.
[0026] Preferably, an air inlet pipe 407 and an air outlet pipe 408 are fixed to and connected to the air storage box 401 and the oxygen box 201, and valves are installed on the air inlet pipe 407 and the air outlet pipe 408.
[0027] Among them, gas can be injected into the gas storage box 401 and the oxygen box 201 through the air inlet pipe 407 and the air outlet pipe 408. The characteristics of the gas can be selected according to the content to be tested.
[0028] Preferably, a glass tube 209 is fixed on and connected to the oxygen box 201 , a marking block 211 is slidably connected to the inside of the glass tube 209 , and scale numbers are provided on the surface of the glass tube 209 .
[0029] When the weight applies pressure to the oxygen box 201, the marking block 211 moves upward inside the glass tube 209 under the action of pressure. The height of the marking block 211 is recorded, and then the time is recorded. The marking block 211 is observed to move downward at intervals of half an hour and one hour (gas will leak through the membrane 3 to be tested, causing the marking block 211 to move downward). The oxygen permeability of the membrane 3 to be tested can be calculated based on the downward distance of the marking block 211.
[0030] Preferably, a pressure sensor 409 is installed inside the gas storage box 401, and the pressure sensor 409 is electrically connected to an external display screen.
[0031] When gas is injected into the gas storage tank 401 , the internal gas pressure of the gas storage tank 401 can be obtained through the pressure sensor 409 .
[0032] Working principle: When testing the silicon oxide high-barrier membrane, the silicon oxide high-barrier membrane is first boiled and printed to make the membrane 3 to be tested suitable for actual use; then the treated membrane 3 to be tested is covered on the mounting tube 207 (by bonding the silicon oxide high-barrier membrane to the tube mouth of the mounting tube 207), and then oxygen (or other gases can be mixed) is injected into the oxygen box 201 through the air inlet pipe 407. The internal oxygen pressure state of the oxygen box 201 is maintained at a constant pressure state, that is, (the piston 205 moves to the top layer of the sliding tube 202 under the action of pressure, and the marking block 211 inside the glass tube 209 moves to the initial position of the scale number), and then the injection of oxygen is stopped, and weights are placed on the weight plate 203. Pressure is applied to the oxygen box 201 through the weights, so that the marking block 211 moves upward inside the glass tube 209 under the action of pressure, and the marking block 211 is recorded. 1 moves to a certain height, and then records the time. The downward movement of the marking block 211 is observed at intervals of half an hour and one hour respectively. The oxygen permeability of the membrane 3 to be tested can be calculated based on the downward movement distance of the marking block 211. After the test is completed, the membrane 3 to be tested is removed and adhered to the elastic membrane 404, so that both sides of the membrane 3 to be tested are connected to the electrode rod 405. Then, gas is injected into the gas storage box 401 to keep the internal pressure of the gas storage box 401 at a value that causes the middle part of the elastic membrane 404 to be in a bulging state. When the elastic membrane 404 is bulging, the membrane 3 to be tested is in a bent state. Then, the electrode rod 405 is connected to an external digital source meter. The air permeability of the membrane 3 to be tested can be tested based on the change in resistivity when the membrane 3 to be tested is bent. The above two test methods of resistance detection and oxygen permeability detection can test the air permeability and oxygen permeability of the membrane 3 to be tested, making the test results more accurate.
[0033] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A water vapor transmission rate testing device for ultra-high barrier films, characterized in that: The invention comprises a working plate (1), an oxygen permeability detection structure (2) and a resistance detection structure (4) are installed on the working plate (1), the oxygen permeability detection structure (2) comprises an oxygen box (201), a sliding tube (202) is fixed on the upper side of the oxygen box (201) and is connected therethrough, a piston (205) is slidably connected inside the sliding tube (202), a sliding rod (204) is fixed on the upper side of the piston (205), a weight plate (203) is fixed on the upper side of the sliding rod (204), a fixed tube (206) is fixed on the upper side of the oxygen box (201) and is connected therethrough, a mounting tube (207) is fixed on the upper side of the fixed tube (206) and is connected therethrough, and a membrane (3) to be detected is fitted on the mounting tube (207).
2. The water vapor transmission rate testing device for ultra-high barrier films according to claim 1, characterized in that: A sleeve (208) is provided on the upper side of the membrane to be detected (3), a steam vent (210) is provided on the sleeve (208), and the sleeve (208) is spirally connected to the installation tube (207).
3. The water vapor transmission rate testing device for ultra-high barrier films according to claim 2, characterized in that: The resistance detection structure (4) comprises an air storage box (401), a test slot (402) is provided on the air storage box (401), a test hole (403) is provided on the test slot (402), an elastic membrane (404) is laid inside the test hole (403), and an electrode rod (405) is installed inside the test slot (402).
4. The water vapor transmission rate testing device for ultra-high barrier films according to claim 3, characterized in that: An air inlet pipe (407) and an air outlet pipe (408) are fixed to and connected to the air storage box (401) and the oxygen box (201), and valves are installed on the air inlet pipe (407) and the air outlet pipe (408).
5. The water vapor transmission rate testing device for ultra-high barrier films according to claim 1, characterized in that: A glass tube (209) is fixed on and connected through the oxygen box (201), a marking block (211) is slidably connected inside the glass tube (209), and scale numbers are provided on the surface of the glass tube (209).
6. The water vapor transmission rate testing device for ultra-high barrier films according to claim 3, characterized in that: A pressure sensor (409) is installed inside the gas storage box (401), and the pressure sensor (409) is electrically connected to an external display screen.