A non-contact test method for moisture conductivity and a hollow fixture using the method

Abstract

The present invention provides a non-contact test method for moisture conductivity, which belongs to the technical field of fabric detection, and includes a test method and a characterization method, wherein the test method is used to obtain detection parameters characterizing the moisture conductivity of fabrics, and the test method specifically includes the following steps: test preparation, clamping, unsupporting, closed test environment, liquid supply, detection, reverse side testing, and data analysis. The non-contact test method for moisture conductivity provided by the embodiment of the present invention obtains accurate and reliable fabric moisture conductivity data, which can truly reflect the performance indicators related to ensuring human comfort of the material under the premise of strong exercise and phase change of sweat.

Description

Technical Field

[0001] The invention belongs to the technical field of fabric detection, and in particular relates to a non-contact test method for moisture conductivity and a hollow fixture using the method. Background Art

[0002] Keeping the skin surface dry is an important performance indicator of sportswear. Under high-intensity exercise conditions, when the air temperature and humidity conditions can still meet the phase change of sweat, the sweat is absorbed from the body surface to the close-fitting fabric in time, and pushed through the skin-contacting surface to the outer surface to achieve phase change. This ability is called liquid transfer ability. With this ability, sweat can evaporate quickly, achieving the requirements of keeping the body surface relatively dry and moderately cooling down to maintain comfort. This type of material also requires another function: unidirectionality, that is, for example, the transfer ability from the skin-contacting surface to the outer surface is much higher than the opposite direction.

[0003] There is no better method for testing the above indicators. The national standard "Dynamic Moisture Transfer Method" in use uses N electrodes distributed on a plane to measure the diffusion area of ​​moisture on the fabric and thus judge the moisture transfer capacity of the fabric in two directions. Obviously, the device used in this method has an unavoidable defect: the electrodes directly contact the test target, which will seriously interfere with the test object during measurement. Specifically:

[0004] 1. According to existing theories, the most effective way to achieve this function is to design materials based on differential capillary effect or fiber hydrophilicity difference. The means is to design the tissue gap between the skin-contacting surface and the outer surface of the material to be different. There is a difference in capillary effect between the skin-contacting surface and the outer surface, thus forming a difference in water transfer power. Liquid water will move from the side with larger tissue gap to the side with smaller tissue gap, or liquid water will move from the side with low water-vapor capacity to the side with high hydrophilicity. The flow of water in this column of materials belongs to porous medium flow, which is seriously affected by porosity and capillary model. In the device of this method, the electrode needs to be pressed against the surface of the material with a certain pressure, which completely destroys the original structural gap of the sample. It is very likely that the capillary power difference will no longer exist, and the accuracy of the test is out of the question.

[0005] 2. According to the jet theory of fluid mechanics, the flow of fluid will have a wall attachment effect. In an uneven flow field, the fluid will be disturbed by the uneven flow field and tend to a certain direction. Therefore, the result of the electrode pressing the material is the formation of islands. These islands are the source of destroying the original relatively uniform flow field. It is very likely that water will preferentially adhere to the edges of these islands or conversely avoid the edges of these islands and bypass them. Therefore, it will be impossible to know the actual situation of water diffusion in the material.

[0006] Therefore, the data obtained under the premise that this method seriously interferes with the test object is inaccurate and untrue. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a non-contact test method for moisture conductivity and a hollow fixture using the method.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A non-contact test method for moisture conductivity, including a test method and a characterization method, wherein the test method is used to obtain detection parameters characterizing the moisture conductivity of a fabric, and specifically includes the following steps:

[0010] S1. Test preparation: Select and cut natural, flat and non-destructive fabrics to be tested, place the fabrics to be tested and the equipment and consumables used for the test in an environment with specified temperature and humidity for a specified time, and record the temperature, humidity, atmospheric pressure and other data;

[0011] S2. Clamping: Use a hollow clamp to clamp the fabric to be tested;

[0012] S3, remove the support: remove the central pad and the central pressure block of the hollow clamp, so that the clamped tested fabric is naturally suspended in the detection hole area;

[0013] S4. Closed test environment: Place the hollow fixture holding the fabric to be tested and the necessary test equipment horizontally on the bracket in the test room, and close the test room to prevent air flow, air vibration, external mechanical vibration and other factors from interfering with the test results;

[0014] S5, liquid supply: inject a certain amount of test liquid from the liquid injection port onto the center of the test area of ​​the tested fabric within a specified time;

[0015] S6. Testing: From the moment the liquid supply starts, the diffusion and penetration of the testing liquid on both the upper and lower surfaces of the tested fabric are tested and recorded;

[0016] S7, reverse side test: turn the tested fabric upside down and repeat the above steps S2 to S6;

[0017] S8, data analysis: using the recorded data and the recording time obtained in the above steps S2 to S7, analyzing the moisture conduction performance of the tested fabric;

[0018] The characterization method is used to characterize the moisture conductivity of the fabric in all directions. The test liquid is dripped onto the free and horizontally tested fabric, and the diffusion of the test liquid in all directions of the tested fabric is observed. The method specifically includes the following steps:

[0019] A1. Define physical coordinates: Take the initial liquid receiving point of the fabric to be tested as the physical origin, the plane where the upper surface of the fabric to be tested is the active plane, and the plane where the lower surface of the fabric to be tested is the driven plane. In the top view direction, take the physical origin as the center, and the direction parallel to the observer's right hand side as 0°, and divide the detection area of ​​the fabric to be tested into 360° in the counterclockwise direction for standby use;

[0020] A2. Define detection parameters: In visual detection, the three primary colors of each pixel in the visual detection area are used as detection parameters; in capacitance detection method, the signal amplitude received by each receiving electrode is used as detection parameter;

[0021] A3. Define the sampling cycle: take the moment when the detection liquid drops as the timing zero point, take the reference value of each group of detection parameters at the timing zero point, take the set time as the interval, cyclically and repeatedly detect each group of detection parameters, and take the current change of all detection parameters less than the set ratio of the average change of the previous 10 detections as the sampling termination mark;

[0022] A4. Test result characterization index: The moisture conductivity of the tested fabric is characterized by two types of indexes: diffusion performance and penetration performance, among which:

[0023] Characterization of diffusion performance: the area of ​​the active plane detection parameter reaching the set change amount within a specific time, or the time required for the active plane detection parameter to reach the set change amount;

[0024] Characterization of penetration performance: the area of ​​the detection parameter in the moving plane reaches the set change amount within a specific time, or the time required for the detection parameter in the moving plane to reach the set change amount.

[0025] As a further improvement of the present invention: the clamping step includes the following steps:

[0026] Place the central block on a horizontally placed flat plate;

[0027] Put the lower splint on the central spacer and put it into place;

[0028] Lay the fabric to be tested flat on the center of the lower plywood;

[0029] Insert the central pressing block into the detection hole in the center of the upper clamping plate and make sure it is in place;

[0030] Align the upper clamping plate with the central pressure block with the lower clamping plate and gently place them down so that they fit together perfectly;

[0031] Tighten the locking device between the upper clamping plate and the lower clamping plate.

[0032] As a further improvement of the present invention: the detection step includes a visual recording method and / or a capacitance testing method;

[0033] The visual recording method includes using a visual recording device to record a frame of image on the upper and lower sides of the fabric under test at regular intervals, and numbering and saving the images;

[0034] The capacitance test method includes setting arc electrodes parallel to the test surface of the tested fabric on the upper and lower sides of the hollow area of ​​the hollow fixture, and detecting and recording the capacitance between the electrodes at regular intervals.

[0035] As a further improvement of the present invention: the capacitance test method is to use multiple sets of arc electrodes to perform capacitance detection between electrodes on the front and back sides of the fabric to be tested, and the capacitance detection includes the following steps:

[0036] Setting electrodes: With the physical origin as the center, set multiple sets of arc electrodes in parallel on the front and back sides of the fabric to be tested;

[0037] Transmitting signal: applying equal frequency and equal amplitude AC signals to the transmitting electrode;

[0038] Reading capacitance value: Identify, read and record the amplitude of the received signal from the electrode adjacent to the transmitting electrode on the same plane; identify, read and record the amplitude of the received signal from the electrode adjacent to the transmitting electrode on a different plane.

[0039] As a further improvement of the present invention: the liquid supply includes free dripping or quantitative timed push injection;

[0040] The free dripping includes allowing the test liquid to slowly flow out of the liquid injection port, and stopping the liquid supply when it drips;

[0041] The quantitative timed push injection includes pushing the quantitative detection liquid from a horizontal pipe mouth close to but not touching the upper surface of the tested fabric within a set time, so that the liquid is injected into the tested fabric.

[0042] A hollow fixture using the above-mentioned non-contact test method for moisture conductivity is characterized in that it includes a central pressure block, an upper clamp, a lower clamp, a central pad and a locking device,

[0043] One side of the central pressing block is provided with an embedded core.

[0044] A first detection hole for accommodating the inlay core is provided in the middle of the upper clamping plate.

[0045] The middle part of the lower clamping plate is provided with a second detection hole for accommodating the central pad.

[0046] The locking device is used to fix the upper clamping plate and the lower clamping plate.

[0047] As a further improvement of the present invention: the area of ​​the embedded core is smaller than the area of ​​the central pressure block, the area of ​​the central pressure block is larger than the area of ​​the first detection hole, the size and shape of the embedded core match the first detection hole, the height of the embedded core is the same as the thickness of the upper splint, and the central pressure block forms a hanging edge on one side edge of the embedded core.

[0048] As a further improvement of the present invention: a handle is provided on a side of the central pressing block away from the insert core.

[0049] As a further improvement of the present invention: the upper clamping plate, the lower clamping plate and the central pad are all flat plates, a plurality of positioning holes are provided at the periphery of the upper clamping plate, and a marking notch is provided on the upper clamping plate.

[0050] The thickness of the central pad is the same as that of the lower splint.

[0051] A plurality of positioning bolts are arranged at the peripheral positions of the lower clamping plate, and the plurality of positioning bolts correspond to the plurality of positioning holes one by one, and the locking device is a nut matching the positioning bolts.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] The non-contact test method for moisture conductivity provided in the embodiment of the present invention can obtain accurate and reliable data on the moisture conductivity of fabrics, and can truly reflect the performance indicators related to ensuring human comfort under the premise of strong exercise and phase change of sweat. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a structural schematic diagram of a hollow clamp. DETAILED DESCRIPTION

[0055] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0056] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0057] The moisture conductivity of clothing fabrics is manifested as the lateral diffusion speed of liquid on the surface of the fabric and the penetration speed to the back of the fabric. During the test, a drop of liquid is dropped on the surface of the fabric, and the wetting speed of the liquid along the side where the drop falls and the wetting speed of the back of the drop are observed. The wetting speed of the liquid along the side where the drop falls reflects the diffusion performance of the fabric; the wetting speed of the liquid along the back of the drop reflects the permeability of the fabric. Visually, wetting is manifested as a change in the color of the fabric. If flat electrodes insulated from the fabric are set on both sides of the fabric, the capacitance between the electrodes will change as the droplets wetting in the fabric.

[0058] Example 1

[0059] Based on the above principles, this embodiment provides a non-contact test method for moisture conductivity, including a test method and a characterization method, wherein the test method is used to obtain detection parameters characterizing the moisture conductivity of a fabric, and specifically includes the following steps:

[0060] S1. Test preparation: Select and cut natural, flat and non-destructive fabrics to be tested, place the fabrics to be tested and the equipment and consumables used for the test in an environment with specified temperature and humidity for a specified time, and record the temperature, humidity, atmospheric pressure and other data;

[0061] S2. Clamping: Use a hollow clamp to clamp the fabric to be tested;

[0062] S3, remove the support: remove the central pad and the central pressure block of the hollow clamp, so that the clamped tested fabric is naturally suspended in the detection hole area;

[0063] S4. Closed test environment: Place the hollow fixture holding the fabric to be tested and the necessary test equipment horizontally on the bracket in the test room, and close the test room to prevent air flow, air vibration, external mechanical vibration and other factors from interfering with the test results;

[0064] S5, liquid supply: inject a certain amount of test liquid from the liquid injection port onto the center of the test area of ​​the tested fabric within a specified time;

[0065] S6. Testing: From the moment the liquid supply starts, the diffusion and penetration of the testing liquid on both the upper and lower surfaces of the tested fabric are tested and recorded;

[0066] S7, reverse side test: turn the tested fabric upside down and repeat the above steps S2 to S6;

[0067] S8. Data analysis: using the recorded data and the recording time obtained in the above steps S2 to S7, analyze the moisture conductivity of the tested fabric.

[0068] The clamping step includes the following subdivision steps:

[0069] Place the central block on a horizontally placed flat plate;

[0070] Put the lower splint on the central spacer and put it into place;

[0071] Lay the fabric to be tested flat on the center of the lower plywood;

[0072] Insert the central pressing block into the detection hole in the center of the upper clamping plate and make sure it is in place;

[0073] Align the upper clamping plate with the central pressure block with the lower clamping plate and gently place them down so that they fit together perfectly;

[0074] Tighten the locking device between the upper clamping plate and the lower clamping plate.

[0075] The detection step is to use one of the following two detection methods, or to use the following two methods together to complement and support each other:

[0076] Visual recording method: Use visual recording equipment to record a frame of image on the upper and lower sides of the tested fabric at regular intervals and save them with numbers;

[0077] Capacitance test method: Arc electrodes parallel to the test surface of the fabric to be tested are set on the upper and lower sides of the hollow area of ​​the hollow fixture. The capacitance between the electrodes is detected and numbered and recorded at regular intervals.

[0078] Furthermore, the liquid supply is one of the following methods:

[0079] Free dripping: Let the test liquid slowly flow out of the injection port, and stop supplying liquid when it drips;

[0080] This method ensures that a drop of test liquid is accurately "intercepted" during the testing process. It relies on factors such as the surface tension of the test liquid in the atmosphere and uses the free droplet formation method to ensure that the liquid supply during the testing process is constant and controlled.

[0081] Quantitative and timed injection: Within the set time, the quantitative test liquid is pushed out from the horizontal nozzle close to but not touching the upper surface of the tested fabric, so that it is injected into the tested fabric.

[0082] In this method, a quantitative liquid supply mechanism (such as a metering pump, syringe pump, etc.) actively pushes the test liquid onto the surface of the fabric being tested in a quantitative manner, and the liquid supply volume during the testing process can also be constant and controlled.

[0083] Furthermore, the capacitance test method is to use multiple sets of electrodes to detect the capacitance between the electrodes on the front and back sides of the fabric under test, including the following subdivision steps:

[0084] Setting electrodes: Taking the physical origin as the center, set multiple sets of electrodes in parallel on the front and back sides of the fabric to be tested;

[0085] ——Use multiple sets of electrodes, clamped on both sides of the fabric to be tested (but not in contact), so as to divide the fabric to be tested into multiple parts. In this structure, multiple sets of electrodes constitute the plates of multiple capacitors, and the fabric to be tested sandwiched in the middle and the test liquid dripped on the fabric to be tested constitute the medium of multiple capacitors.

[0086] Transmitting signal: applying equal frequency and equal amplitude AC signals to the transmitting electrode;

[0087] Reading capacitance value: Identify, read and record the amplitude of the received signal from the electrode adjacent to the transmitting electrode on the same plane; identify, read and record the amplitude of the received signal from the electrode adjacent to the transmitting electrode on a different plane.

[0088] ——The wetting area of ​​the test liquid in the tested fabric will change the dielectric parameters of the capacitor between the electrodes, which will eventually be manifested as a change in the signal amplitude received by the receiving electrode. This method calculates and determines the wetting of the test liquid in the tested fabric by identifying and reading the amplitude of the alternating signal received by each electrode, thereby detecting the moisture conductivity of the tested fabric.

[0089] The characterization method is used to characterize the moisture conductivity of the fabric in all directions. The test liquid is dripped onto the free and horizontally tested fabric, and the diffusion of the test liquid in all directions of the tested fabric is observed. The method specifically includes the following steps:

[0090] A1. Define physical coordinates: Take the initial liquid receiving point of the fabric to be tested as the physical origin, the plane where the upper surface of the fabric to be tested is the active plane, and the plane where the lower surface of the fabric to be tested is the driven plane. In the top view direction, take the physical origin as the center, and the direction parallel to the observer's right hand side as 0°, and divide the detection area of ​​the fabric to be tested into 360° in the counterclockwise direction for standby use;

[0091] In many cases, textile fabrics are not made of a single material. According to functional requirements, there are differences in materials or production processes between the two sides of the fabric, in different directions of warp and weft, etc. These differences will inevitably cause differences in the moisture conductivity of the fabric between the two sides and in different directions of the same side. This is why it is necessary to define coordinates in step A1. In the final test results, it will characterize the moisture conductivity of the fabric on different sides and in different directions with the detection parameters corresponding to each physical coordinate, so as to guide the research and development and production of fabrics, and detect the execution of materials and process technology.

[0092] A2. Define detection parameters: In visual detection, the three primary colors of each pixel in the visual detection area are used as detection parameters; in capacitance detection method, the signal amplitude received by each receiving electrode is used as detection parameter;

[0093] A3. Define the sampling cycle: take the moment when the detection liquid drops as the timing zero point, take the reference value of each group of detection parameters at the timing zero point, take the set time as the interval, cyclically and repeatedly detect each group of detection parameters, and take the current change of all detection parameters less than the set ratio of the average change of the previous 10 detections as the sampling termination mark;

[0094] A4. Test result characterization index: The moisture conductivity of the tested fabric is characterized by two types of indexes: diffusion performance and penetration performance, among which:

[0095] Characterization of diffusion performance: the area of ​​the active plane detection parameter reaching the set change amount within a specific time, or the time required for the active plane detection parameter to reach the set change amount;

[0096] Characterization of penetration performance: the area of ​​the detection parameter in the moving plane reaches the set change amount within a specific time, or the time required for the detection parameter in the moving plane to reach the set change amount.

[0097] That is, the moisture conductivity of the fabric in each direction is characterized by the speed at which the liquid soaks in each direction of the fabric being tested.

[0098] Example 2

[0099] See also Figure 1 This embodiment provides a hollow fixture using the above-mentioned non-contact test method for moisture conductivity, including a central pressing block 1, an upper clamp 2, a lower clamp 3, a central cushion block 4 and a locking device 5, wherein one side of the central pressing block 1 is provided with an embedded core 13, a first detection hole 21 for accommodating the embedded core 13 is opened in the middle of the upper clamp 2, a second detection hole 31 for accommodating the central cushion block 4 is opened in the middle of the lower clamp 3, and the locking device 5 is used to fix the upper clamp 2 and the lower clamp 3;

[0100] The area of ​​the core insert 13 is smaller than that of the central pressing block 1, and the area of ​​the central pressing block 1 is larger than that of the first detection hole 21. The size and shape of the core insert 13 match the first detection hole 21. The height of the core insert 13 is the same as the thickness of the upper clamping plate 2. The central pressing block 1 forms a hanging edge 12 at one side edge of the core insert 13.

[0101] The hanging edge 12 is a positioning edge located above the embedded core 13 and having a size much larger than the first detection hole 21 in the center of the upper clamping plate 2. It is used to realize the positioning between the central pressure block 1 and the upper clamping plate 2 in the vertical direction when the central pressure block 1 is embedded in the upper clamping plate 2. The embedded core 13 is a protruding block with an outer edge shape consistent with the first detection hole 21 in the center of the upper clamping plate 2, a slightly smaller size, and a flat lower surface. It can be embedded in the first detection hole 21 in the center of the upper clamping plate 2 during manual operation, or taken out from the detection hole 21 in the center of the upper clamping plate 2.

[0102] The upper clamping plate 2, the lower clamping plate 3 and the central pad 4 are all flat plates, and a plurality of positioning holes 22 are provided at the peripheral positions of the upper clamping plate 2. In order to facilitate the identification of the direction of the clamped measured fabric, or to reduce the processing accuracy requirements for the mutual positioning of the upper clamping plate 2 and the lower clamping plate 3, a marking notch 23 is provided on the upper clamping plate 2. The thickness of the central pad 4 is the same as that of the lower clamping plate 3, and the shape of its outer edge is consistent with the second detection hole 31 in the center of the lower clamping plate 3, and its size is slightly smaller. It can be embedded in the second detection hole 31 in the center of the lower clamping plate 3 during manual operation, and can fall off freely from the second detection hole 31 in the center of the lower clamping plate 3 by its own gravity when the lower clamping plate is lifted; a plurality of positioning bolts 32 are provided at the peripheral positions of the lower clamping plate 3, and the plurality of positioning bolts correspond to the plurality of positioning holes 22 one by one. When matched, the plurality of positioning bolts 32 are correspondingly inserted into the pairs of positioning holes 22 on the upper clamping plate 2 to achieve positioning between the upper clamping plate 2 and the lower clamping plate 3, and the locking device 5 is a bolt matching the positioning bolts 32.

[0103] A handle 11 is provided on one side of the central pressing block 1 away from the inlay core 13 ; the handle 11 is a portion located above the inlay core 13 and the hanging edge for easy grasping.

[0104] Specifically, the first detection hole 21 and the second detection hole 31 are circular structures, the lower clamping plate 3 and the upper clamping plate 2 are both made of non-conductive materials, and the inside and edges of the first detection hole 21 and the second detection hole 31 are both made of water-repellent materials or coated with water-repellent coatings.

[0105] When working, clamp the fabric to be tested into the above hollow fixture according to the following steps:

[0106] 1. Place the central pad 4 on a flat operating surface;

[0107] 2. Put the lower splint 3 on the central pad 4, make sure it is in place and the upper surfaces of the two are aligned;

[0108] 3. Lay the fabric to be tested flat in the center of the lower clamping plate 3 in the required direction, covering the central pad 4;

[0109] 4. Insert the central pressing block 1 into the first detection hole 21 in the center of the upper clamping plate 2 and make sure it is inserted in place;

[0110] 5. Lift the upper clamping plate 2 with the central pressure block 1, align the multiple positioning holes 22 on it with the multiple positioning bolts 32 of the lower clamping plate 3, and gently put it down to assemble the upper clamping plate 2 and the lower clamping plate 3 together;

[0111] 6. Screw the multiple locking nuts 5 onto the positioning bolts 32;

[0112] 7. Lift the central pressure block 1 on the upper clamping plate 2, lift the upper clamping plate 2 and the lower clamping plate 3 locked together, and make the central cushion block 4 embedded in the second detection hole 31 in the center of the lower clamping plate 3 fall off by its own gravity.

[0113] At this point, the clamping process of the fabric to be tested is completed, and the fixture clamping the fabric to be tested can be installed in a closed testing space, and the testing method in Example 1 is executed to detect the moisture conductivity of the fabric to be tested.

[0114] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A non-contact test method for moisture conductivity, characterized in that: The method is performed using a hollow clamp, which includes a central pressure block, an upper clamp, a lower clamp, a central pad and a locking device. The central pressing block is provided with an insert core on one side and a handle on the other side. A first detection hole for accommodating the inlay core is provided in the middle of the upper clamping plate. The middle part of the lower clamping plate is provided with a second detection hole for accommodating the central pad. The locking device is used to fix the upper clamping plate and the lower clamping plate; The method includes a testing method and a characterization method, wherein the testing method is used to obtain detection parameters characterizing the moisture conduction performance of the fabric, and specifically includes the following steps: S1. Test preparation: Select and cut natural, flat and non-destructive fabrics to be tested, place the fabrics to be tested and the equipment and consumables used for the test in an environment with specified temperature and humidity for a specified time, and record the temperature, humidity and atmospheric pressure data; S2. Clamping: Use a hollow clamp to clamp the fabric to be tested; S3, remove the support: remove the central pad and the central pressure block of the hollow clamp, so that the clamped tested fabric is naturally suspended in the detection hole area; S4. Closed test environment: Place the hollow fixture holding the fabric to be tested and the necessary test equipment horizontally on the bracket in the test room, and close the test room to prevent air flow, air vibration, and external mechanical vibration factors from interfering with the test results; S5, liquid supply: inject a certain amount of test liquid from the liquid injection port onto the center of the test area of ​​the tested fabric within a specified time; S6. Testing: From the moment the liquid supply starts, the diffusion and penetration of the testing liquid on both the upper and lower surfaces of the tested fabric are tested and recorded; S7, reverse side test: turn the tested fabric upside down and repeat the above steps S2 to S6; S8, data analysis: using the recorded data and the recording time obtained in the above steps S2 to S7, analyzing the moisture conduction performance of the tested fabric; The characterization method is used to characterize the moisture conductivity of the fabric in all directions. The test liquid is dripped onto the free and horizontally tested fabric, and the diffusion of the test liquid in all directions of the tested fabric is observed. The method specifically includes the following steps: A1. Define physical coordinates: Take the initial liquid receiving point of the fabric to be tested as the physical origin, the plane where the upper surface of the fabric to be tested is the active plane, and the plane where the lower surface of the fabric to be tested is the driven plane. In the top view direction, take the physical origin as the center, and the direction parallel to the observer's right hand side as 0°, and divide the detection area of ​​the fabric to be tested into 360° in the counterclockwise direction for standby use; A2. Define detection parameters: In visual detection, the three primary colors of each pixel in the visual detection area are used as detection parameters; in capacitance detection method, the signal amplitude received by each receiving electrode is used as detection parameter; A3. Define the sampling cycle: take the moment when the detection liquid drops as the timing zero point, take the reference value of each group of detection parameters at the timing zero point, take the set time as the interval, cyclically and repeatedly detect each group of detection parameters, and take the current change of all detection parameters less than the set ratio of the average change of the previous 10 detections as the sampling termination mark; A4. Test result characterization index: The moisture conductivity of the tested fabric is characterized by two types of indexes: diffusion performance and penetration performance, among which: Characterization of diffusion performance: the area of ​​the active plane detection parameter reaching the set change amount within a specific time, or the time required for the area of ​​the active plane detection parameter to reach the set change amount; Characterization of penetration performance: the area of ​​the detection parameter in the moving plane reaches the set change amount within a specific time, or the time required for the detection parameter in the moving plane to reach the set change amount.

2. The non-contact test method for moisture conductivity according to claim 1, characterized in that: The clamping step comprises the following steps: Place the central block on a horizontally placed flat plate; Put the lower splint on the central spacer and put it into place; Lay the fabric to be tested flat on the center of the lower plywood; Insert the central pressing block into the detection hole in the center of the upper clamping plate and make sure it is in place; Align the upper clamping plate with the central pressure block with the lower clamping plate and gently place them down so that they fit together perfectly; Tighten the locking device between the upper and lower clamping plates.

3. The non-contact test method for moisture conductivity according to claim 1, characterized in that: The detection step includes a visual recording method and / or a capacitance testing method; The visual recording method includes using a visual recording device to record a frame of image on the upper and lower sides of the fabric under test at regular intervals, and numbering and saving the images; The capacitance test method includes setting arc electrodes parallel to the test surface of the tested fabric on the upper and lower sides of the hollow area of ​​the hollow fixture, and detecting and recording the capacitance between the electrodes at regular intervals.

4. The non-contact test method for moisture conductivity according to claim 3, characterized in that: The capacitance test method is to use multiple sets of arc electrodes to detect the capacitance between the electrodes on the front and back sides of the fabric being tested. The capacitance detection includes the following steps: Setting electrodes: With the physical origin as the center, set multiple sets of arc electrodes in parallel on the front and back sides of the fabric to be tested; Transmitting signal: applying equal frequency and equal amplitude AC signals to the transmitting electrode; Reading capacitance value: Identify, read and record the amplitude of the received signal from the electrode adjacent to the transmitting electrode on the same plane; identify, read and record the amplitude of the received signal from the electrode adjacent to the transmitting electrode on a different plane.

5. The non-contact test method for moisture conductivity according to claim 1, characterized in that: The liquid supply includes free dripping or quantitative timed push injection; The free dripping includes allowing the test liquid to slowly flow out of the liquid injection port, and stopping the liquid supply when it drips; The quantitative timed push injection includes pushing the quantitative detection liquid from a horizontal pipe mouth close to but not touching the upper surface of the tested fabric within a set time, so that the quantitative detection liquid is injected into the tested fabric.

6. The non-contact test method for moisture conductivity according to claim 1, characterized in that: The area of ​​the embedded core is smaller than that of the central pressing block, and the area of ​​the central pressing block is larger than that of the first detection hole. The size and shape of the embedded core match those of the first detection hole.

7. The non-contact test method for moisture conductivity according to claim 6, characterized in that: The height of the inlay core is the same as the thickness of the upper clamping plate, and the central pressing block forms a hanging edge at one side edge position toward the inlay core.

8. The non-contact test method for moisture conductivity according to claim 1, characterized in that: The upper clamping plate, the lower clamping plate and the central pad are all flat plates. A plurality of positioning holes are arranged at the periphery of the upper clamping plate, and a marking notch is arranged on the upper clamping plate. A plurality of positioning bolts are arranged at the peripheral positions of the lower clamping plate, and the plurality of positioning bolts correspond to the plurality of positioning holes one by one, and the locking device is a nut matched with the positioning bolts.

9. The non-contact test method for moisture conductivity according to claim 8, characterized in that: The thickness of the central pad is the same as that of the lower clamping plate.

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