A device for testing the formaldehyde purification performance of artificial boards

Abstract

The utility model relates to a kind of artificial board formaldehyde purification performance testing device, including sample cabin and contrast cabin, artificial board support is equipped in sample cabin, glass dish, hot plate and support are sequentially connected from top to bottom in both sample cabin and contrast cabin, stirring fan and formaldehyde color card component are equipped on the inner wall of both sample cabin and contrast cabin, outside is equipped with air inlet valve, air outlet valve and injection port, injection port corresponds with the position of glass dish;Sample cabin and contrast cabin are connected with humidity generator by corresponding air inlet valve, humidity generator is connected with gas cylinder, sample cabin is connected with formaldehyde detector by the sample cabin sampling port being equipped in the lower portion of sample cabin, contrast cabin is connected with formaldehyde detector by the contrast cabin sampling port being equipped in the lower portion of contrast cabin;In sample cabin and contrast cabin, the stirring fan on one inner wall corresponds with the position of formaldehyde color card component on another inner wall, hygrothermograph is equipped in both sample cabin and contrast cabin, and the intuitive and accuracy of lifting device are improved.

Description

Technical Field

[0001] This utility model relates to a formaldehyde purification performance testing device for engineered wood products, belonging to the field of formaldehyde absorption efficiency testing technology. Background Technology

[0002] The production process of engineered wood products often requires the use of amino resin adhesives containing formaldehyde, leading to formaldehyde release issues during the use of engineered wood products and their products. The national standard GB 18580—2025 has mandated that the formaldehyde release limit for engineered wood products be raised to E0 level (limit value ≤0.050 mg / m³).

[0003] The patent CN104614496A, entitled "A Formaldehyde Adsorption Test Chamber," includes a chamber body. The side of the chamber body has a door, a gas inlet, and a glove mounting hole. A chemical-resistant glove is installed facing the inside of the chamber, with its edge sealed and fixed to the glove mounting hole. Before introducing formaldehyde gas, a sealed container containing a measured amount of formaldehyde adsorbent is placed inside the chamber. After formaldehyde is introduced into the sealed chamber, the sealed container is opened using the chemical-resistant glove on the chamber body, and the measured amount of formaldehyde adsorbent is poured into a loading device. The chemical-resistant glove on the glove mounting hole is used for operation in a completely sealed environment inside the chamber, preventing formaldehyde from escaping and affecting the test results.

[0004] The formaldehyde purification and detection device disclosed in the above patent is only applicable to powdered or small-sized adsorbent materials, not to large-sized artificial board products, and cannot be directly observed to observe the adsorption of formaldehyde by the adsorbent material to be tested. Utility Model Content

[0005] The purpose of this invention is to provide a formaldehyde purification performance testing device for engineered wood products, so as to solve the problems mentioned in the background art.

[0006] The technical solution of this utility model is as follows:

[0007] A formaldehyde purification performance testing device for engineered wood products includes a sample chamber and a control chamber. The sample chamber is equipped with an engineered wood support. Both the sample chamber and the control chamber are equipped with a glass dish, a heating plate and a support connected from top to bottom. The inner walls of both the sample chamber and the control chamber are equipped with a stirring fan and a formaldehyde colorimetric card assembly. Both chambers are equipped with an air inlet valve, an air outlet valve and an injection port on the outside. The injection port corresponds to the position of the glass dish.

[0008] The sample chamber and the control chamber are connected to the humidity generator through corresponding air inlet valves. The humidity generator is connected to the gas cylinder. The sample chamber is connected to the formaldehyde detector through the sample chamber sampling port located below the sample chamber. The control chamber is connected to the formaldehyde detector through the control chamber sampling port located below the control chamber.

[0009] In the sample chamber and the control chamber, the stirring fan on one inner wall corresponds to the formaldehyde colorimetric card component on the other inner wall. Both the sample chamber and the control chamber are equipped with thermometers and hygrometers.

[0010] Furthermore, both the sample chamber and the control chamber are equipped with covers, and silicone sealing rings are provided at the connection between the covers and the sample chamber or control chamber.

[0011] Furthermore, both the sample chamber and the control chamber are 750mm×1000mm×800mm in size, and the sample chamber and the control chamber are enclosed by a transparent panel that does not adsorb formaldehyde to form a test device.

[0012] Furthermore, the artificial board support is used to place the artificial board sample, which is 200-500mm long and 200-500mm wide.

[0013] Furthermore, the formaldehyde colorimetric card includes a turntable with multiple filter papers evenly distributed on it, a cover plate on the turntable with a detection window on the cover plate, the size of the detection window corresponding to one filter paper, and a controller located in the middle of the turntable to control the rotation of the turntable.

[0014] Furthermore, the cover is constructed by enclosing a transparent panel.

[0015] Furthermore, a one-way inlet is provided on one side of the inspection window, and a one-way inlet is provided on the other side of the inspection window.

[0016] Furthermore, the controller is used to drive the turntable to rotate once around the central axis of the turntable at a preset time, and each rotation will rotate the next filter paper to the position of the detection window.

[0017] This utility model has the following beneficial effects:

[0018] 1. Set up a sample chamber and a control chamber. By comparing the sample chamber and the control chamber, the formaldehyde purification function of the artificial board can be observed more clearly and intuitively, thus improving the intuitiveness of the device.

[0019] 2. A formaldehyde colorimetric card component is set up, in which multiple filter papers soaked in Schiff's reagent are evenly distributed on a turntable. The turntable is rotated at a preset time, and the filter papers rotate to the detection window in turn. The Schiff's reagent on the filter paper reacts with the formaldehyde gas. By comparing the colors of the filter papers, the changes in formaldehyde concentration in the sample chamber and the control chamber over 24 hours are displayed intuitively, which improves the intuitiveness of the device.

[0020] 3. A support frame, a heating plate, and glass dishes are set up in the sample chamber and the control chamber. The heating plate heats the formaldehyde liquid on the glass dishes, causing the formaldehyde liquid to evaporate into formaldehyde gas. A stirring fan is also installed in the sample chamber and the control chamber. The heating plate and the stirring fan work together to accelerate the evaporation rate of formaldehyde, allowing the formaldehyde to be quickly distributed in the sample chamber and the control chamber. This avoids uneven distribution of formaldehyde affecting the test results and improves the accuracy of the test results.

[0021] 4. Equip the sample chamber and control chamber with a thermometer, hygrometer, and gas cylinder to precisely control the humidity, effectively avoid the impact of temperature and humidity changes on measurement accuracy, and improve the accuracy of the test results. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the formaldehyde colorimetric card component of this utility model.

[0024] The reference numerals in the figure are as follows:

[0025] 1. Sample chamber; 2. Control chamber; 3. Humidity generator; 4. Gas cylinder; 5. Formaldehyde detector; 6. Particleboard support; 7. Support; 8. Heating plate; 9. Glass dish; 10. Stirring fan; 11. Thermometer and hygrometer; 12. Gas outlet valve; 13. Gas sampling port of sample chamber; 14. Gas sampling port of control chamber; 15. Injection port; 16. Gas inlet valve; 17. Formaldehyde colorimetric card assembly; 171. Turntable; 172. Cover plate; 173. Controller; 174. Filter paper; 175. One-way inlet; 176. One-way outlet; 177. Detection window. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] A formaldehyde purification performance testing device for engineered wood products includes:

[0028] The sample chamber 1 is equipped with a man-made board support 6, a thermometer and hygrometer 11, a support 7, a heating plate 8, a glass dish 9, and a stirring fan 10. The support 7 is equipped with the heating plate 8 and the glass dish 9 from bottom to top. The stirring fan 10 is located on the side wall of the sample chamber 1. The outside of the sample chamber 1 is equipped with an injection port 15, an air inlet valve 16, and an air outlet valve 12. The sample chamber 1 is equipped with a sample chamber gas sampling port 13 at the bottom. The support 7 is a stainless steel support, and the heating plate 8 is a silicone heating plate. The temperature range of the heating plate 8 is adjustable from 30℃ to 100℃.

[0029] The comparison chamber 2 is used to compare with the sample chamber 1 and clearly display the formaldehyde purification efficiency of the artificial board sample in the sample chamber 1. The comparison chamber 2 is equipped with a thermometer and hygrometer 11, a support 7, a heating plate 8, a glass dish 9 and a stirring fan 10. The support 7 is equipped with the heating plate 8 and the glass dish 9 from bottom to top. The stirring fan 10 is located on the side wall of the comparison chamber 2. The upper part of the comparison chamber 2 is equipped with an injection port 15, an air inlet valve 16 and an air outlet valve 12. The lower part of the comparison chamber 2 is equipped with a gas sampling port 14. The support 7 is a stainless steel support and the heating plate 8 is a silicone heating plate. The temperature range of the heating plate 8 is adjustable from 30℃ to 100℃.

[0030] The dimensions of sample chamber 1 and control chamber 2 are both 750mm (width) × 1000mm (depth) × 800mm (height). Sample chamber 1 and control chamber 2 are enclosed by a transparent plate that does not adsorb formaldehyde to form a test device. Sample chamber 1 is equipped with a board support 6 for placing board samples. The length and width of the board samples are 200-500mm.

[0031] The glass dish 9, heating plate 8, and support 7 are arranged sequentially from top to bottom. The injection port 15 of the sample chamber 1 corresponds to the position of the glass dish 9 in the sample chamber 1, and the injection port 15 of the control chamber 2 corresponds to the position of the glass dish 9 in the control chamber 2. The formaldehyde solution is injected into the glass dish 9 in the sample chamber 1 or the glass dish 9 in the control chamber 2 through the injection port 15. The temperature range of the heating plate 8 is adjustable from 30℃ to 100℃. With the cooperation of the stirring fan 10 and the heating plate 8, the formaldehyde solution is accelerated to evaporate into gas, so that the formaldehyde gas is evenly distributed in the sample chamber 1 (control chamber 2).

[0032] Humidity generator 3 is connected to the air inlet valve 16 on sample chamber 1 and air inlet valve 16 on control chamber 2. Humidity generator 3 is connected to gas cylinder 4. The humidity in sample chamber 1 and control chamber 2 is precisely adjusted by the combination of humidity generator 3 and gas cylinder 4 to avoid the humidity in sample chamber 1 and control chamber 2 from affecting the test results. Gas sampling port 13 in sample chamber and gas sampling port 14 in control chamber are connected to formaldehyde detector 5. Formaldehyde detector 5 is used to calculate the formaldehyde concentration in sample chamber 1 and control chamber 2 before and after purification.

[0033] The formaldehyde colorimetric card assembly 17 includes a turntable 171, a cover plate 172, a controller 173, and filter papers 174. Multiple filter papers 174 soaked in Schiff's reagent are evenly distributed on the turntable 171, with twelve filter papers being optimal. The cover plate 172 covers the turntable 171 and is formed by a transparent plate. A detection window 177 is provided on the cover plate 172, the size of which corresponds to one filter paper 174. The detection window 177 has a one-way inlet 175 on one side and a one-way outlet 176 on the other side. The controller 173 is located at the center of the turntable 171. The turntable 171 rotates based on a preset time. The turntable 171, with a preset time of two hours, is controlled by the controller 173 to rotate around the central axis of the turntable 171. This causes the filter paper 174, which was originally located in the detection window 177, to enter the cover plate 172 through the one-way inlet 175. The filter paper 174 that has not yet reacted with the formaldehyde gas leaves the cover plate 172 through the one-way outlet 176, and then the next filter paper 174 is rotated to the position of the detection window 177 to react with the formaldehyde gas. The turntable 171 is rotated once every two hours, and there are a total of twelve filter papers 174. This is used to detect the formaldehyde gas concentration in the sample chamber 1 and the control chamber 2 within 24 hours, which intuitively demonstrates the formaldehyde purification performance of the artificial board.

[0034] The formaldehyde colorimetric card assembly 17 is located on one side of the inner wall of the sample chamber 1 (comparison chamber 2), and the stirring fan 10 is located on the other side of the inner wall of the sample chamber 1 (comparison chamber 2). When the stirring fan 10 is running, it pushes the formaldehyde gas to be evenly spread into the sample chamber 1 (comparison chamber 2) to accelerate the color development speed of the formaldehyde colorimetric card assembly 17.

[0035] The workflow for testing the purification efficiency of engineered wood panels using this invention is as follows:

[0036] The formaldehyde concentration in sample chamber 1 and control chamber 2 was measured, and the formaldehyde concentration in both chambers was adjusted to not exceed 0.04 g / L. The artificial board sample to be tested is placed on the artificial board support 6 in the sample chamber 1, and the sample chamber 1 and the control chamber 2 are sealed.

[0037] Turn on the humidity generator 3 and gas cylinder 4, and adjust the temperature and humidity values ​​in the sample chamber 1 and the control chamber 2. The temperature adjustment range is 22℃ to 24℃, and the humidity adjustment range is 47% to 53%.

[0038] Close the exhaust valve 12 and the inlet valve 16, and inject formaldehyde solution into the sample chamber 1 and the control chamber 2 through the injection port 15. The injection range of the formaldehyde solution is 2. Up to 5 Turn on the stirring fan 10 and the heating plate 8 to allow the formaldehyde solution to evaporate fully. The temperature of the heating plate 8 can be adjusted from 50°C to 60°C.

[0039] Two hours later, the stirring fan 10 was turned off, and the gas sampling port 14 of the control chamber was opened. 10L of gas was collected from the control chamber 2 using a formaldehyde detector 5 at a constant speed, and the initial formaldehyde concentration in the control chamber 2 was measured. Close the gas sampling port 14 of the comparison chamber, open the gas sampling port 13 of the sample chamber, and collect the gas in the 10L sample chamber 1 at a constant rate using the formaldehyde detector 5 to measure the initial formaldehyde concentration in the sample chamber 1. After the measurement is completed, turn on the stirring fan 10;

[0040] After 24 hours, the stirring fan 10 was turned off, and 10L of gas was collected at a constant speed from the gas sampling port 14 of the control chamber to measure the formaldehyde concentration in control chamber 2 after 24 hours. The formaldehyde concentration in sample chamber 1 was measured at the gas sampling port 13 of the sample chamber on the 24th hour. Calculate the formaldehyde concentration decay rate R and purification efficiency. The formula is as follows:

[0041]

[0042]

[0043] in, To compare the formaldehyde concentration in chamber 2 at 24 hours, To compare the formaldehyde concentration in chamber 2 at the second hour, The formaldehyde concentration in sample chamber 1 at 24 hours is given. The formaldehyde concentration decay rate in control chamber 2 over 24 hours should not exceed 20%.

[0044] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A formaldehyde purification performance testing device for engineered wood products, characterized in that: It includes a sample chamber and a control chamber. The sample chamber is equipped with an artificial board support. Both the sample chamber and the control chamber are equipped with glass dishes, heating plates and supports connected from top to bottom. The inner walls of the sample chamber and the control chamber are equipped with stirring fans and formaldehyde color card components. The exterior is equipped with an air inlet valve, an air outlet valve and an injection port. The injection port corresponds to the position of the glass dish. The sample chamber and the control chamber are connected to the humidity generator through corresponding air inlet valves. The humidity generator is connected to the gas cylinder. The sample chamber is connected to the formaldehyde detector through the sample chamber sampling port located below the sample chamber. The control chamber is connected to the formaldehyde detector through the control chamber sampling port located below the control chamber. In the sample chamber and the control chamber, the stirring fan on one inner wall corresponds to the formaldehyde colorimetric card component on the other inner wall. Both the sample chamber and the control chamber are equipped with thermometers and hygrometers.

2. The formaldehyde purification performance testing device for engineered wood panels as described in claim 1, characterized in that: Both the sample chamber and the control chamber are equipped with a cover, and a silicone sealing ring is provided at the connection between the cover and the sample chamber or control chamber.

3. The formaldehyde purification performance testing device for engineered wood products as described in claim 1, characterized in that: Both the sample chamber and the control chamber are 750mm×1000mm×800mm in size. The sample chamber and the control chamber are enclosed by a transparent panel that does not adsorb formaldehyde to form a test device.

4. The formaldehyde purification performance testing device for engineered wood products as described in claim 1, characterized in that: The artificial board support is used to place artificial board samples, which are 200-500mm long and 200-500mm wide.

5. The formaldehyde purification performance testing device for engineered wood products as described in claim 1, characterized in that: The formaldehyde colorimetric card includes a turntable with multiple filter papers evenly distributed on it, each soaked in Schiff's reagent. The turntable has a cover plate with a detection window, the size of which corresponds to one filter paper. A controller is located in the center of the turntable to control its rotation.

6. The formaldehyde purification performance testing device for engineered wood products as described in claim 5, characterized in that: The cover is made of transparent panels.

7. The formaldehyde purification performance testing device for engineered wood products as described in claim 5, characterized in that: One-way inlet is located on one side of the inspection window, and another one-way inlet is located on the other side of the inspection window.

8. The formaldehyde purification performance testing device for engineered wood products as described in claim 5, characterized in that: The controller is used to drive the turntable to rotate once around the central axis of the turntable at a preset time. Each rotation will rotate the next filter paper to the position of the detection window.

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