Method and device for testing moisture removal performance of down jacket

Abstract

The invention discloses a method and device for testing the moisture removal performance of a down jacket, and the method comprises the steps: carrying out the temperature and humidity pre-adjustment of a down jacket down bag with a moisture removal structure, and then adjusting the temperature and humidity to preset test values; carrying out multi-point clamping and multi-mode stretching on the velvet bag to simulate the motion state of a human body; picture data of down flowers in the down bag in the stretching process, humidity data of the down bag close to the human body layer and airflow velocity data at an outlet of the moisture removal structure are obtained; analyzing the state of the down flowers according to the picture data of the down flowers, and calculating the moisture removal efficiency and the accumulated humidity gradient according to the humidity data and the airflow velocity data; and obtaining a moisture removal performance test result according to the down state, the moisture removal efficiency and the accumulated humidity gradient. According to the method, the down feather structure change-airflow path-humidity diffusion three-dimensional relation is established through the down feather state, the humidity elimination efficiency and the humidity cumulative gradient to evaluate the humidity elimination performance, design defects can be accurately positioned, the humidity elimination efficiency is quantified, the test sensitivity is high, and guiding of process improvement is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of clothing testing, and in particular relates to a method and device for testing the moisture-wicking performance of a down jacket. Background Art

[0002] In the existing technology, the moisture-wicking performance of clothing is usually verified by testing the moisture resistance of clothing on a sweating warm manikin. This makes it impossible to locate local moisture-wicking weak areas. Static testing methods make it difficult to capture the microscopic morphology of down fibers in motion in real time, and ignore the impact of down displacement on airflow channels during motion. There is also a lack of coordinated quantitative analysis of humidity and airflow. There is no testing scheme in this field that accurately reflects the three-dimensional relationship between dynamic down structure changes, airflow paths, and humidity diffusion. Therefore, it is necessary to design a more accurate method for testing the moisture-wicking performance of down jackets. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method and device for testing the moisture removal performance of down jackets. The moisture removal performance is evaluated by the down cluster state, moisture removal efficiency and humidity accumulation gradient. The method can accurately locate design defects and quantify moisture removal efficiency. The test has high sensitivity and helps guide process improvements.

[0004] The present invention provides the following technical solutions: In a first aspect, a method for testing the moisture-wicking performance of a down jacket is provided, comprising the following steps: Perform pre-temperature and humidity control on down jacket bags with moisture-wicking structures, and then adjust the temperature and humidity to the preset test values; The velvet bag is clamped at multiple points and stretched in multiple modes to simulate the motion of the human body; Obtain image data of the down inside the velvet bag during stretching, humidity data of the layer of the velvet bag close to the human body, and air flow velocity data at the outlet of the moisture removal structure; Analyze the status of the velvet based on its image data, and calculate the dehumidification efficiency and humidity accumulation gradient based on the humidity data and air flow velocity data; The moisture removal performance test results are obtained based on the state of the tufts, moisture removal efficiency and humidity accumulation gradient.

[0005] Furthermore, the down bag is filled with white duck down with a down content of 85-90% and a fluffiness of more than 800FP.

[0006] Furthermore, the pre-temperature and humidity control process includes: adjusting the temperature of the environment chamber where the velvet bag is located to 34-35°C and the humidity to 25-35%RH, so that the temperature and humidity of the velvet bag are balanced; The adjusting the temperature and humidity to the preset test values ​​includes: maintaining the temperature of the environmental chamber at 34-35° C. and adjusting the humidity to 85-95% RH.

[0007] Furthermore, the multi-point clamping and multi-mode stretching of the velvet bag includes: clamping the velvet bag at the top, bottom, left, right, front and back positions, and using three stretching modes alternately for 4.5 to 5 minutes.

[0008] Furthermore, the three stretching modes include: Vertical compression mode, used to simulate arm swing compression, with an operating frequency of 1-1.1 Hz and a stroke of 5-5.5 cm; Horizontal reciprocating mode, used to simulate trunk twisting, with an operating frequency of 0.5-0.6 Hz and a stroke of 8-8.5 cm; Multi-directional random vibration mode is used to simulate irregular operation, with an operating amplitude of 2.5~3.5cm.

[0009] Furthermore, the analyzing the state of the velvet clumps according to the velvet clumps image data includes: using a YOLOv5 algorithm to identify the state of the velvet clumps through velvet clump feature maps of different sizes; Among them, if the diameter of the down is greater than 4mm, the down is in a completely fluffy state; if the diameter of the down is 2mm≤the diameter of the down ≤4mm, the down is in a semi-fluffy state; if the diameter of the down is less than 2mm, the down is in a flattened state.

[0010] Furthermore, the calculation formula of the moisture removal efficiency η is: ; Where V_out represents the volume flow rate, and V_in represents the initial humidity rise rate; in, ; ; Where v represents the peak air velocity at the outlet of the moisture removal structure, M represents the effective area of ​​the moisture removal hole, and ΔRH represents the humidity change from the start of movement to Δt. The calculation formula of the humidity cumulative gradient G is: G ; Where, It represents the average value of humidity change every Δt1 in steady state.

[0011] Furthermore, the moisture removal performance test results obtained according to the velvet state, moisture removal efficiency and humidity accumulation gradient include: When the proportion of fully fluffy down is ≥60%, the moisture removal efficiency η is ≥80%, and the cumulative humidity gradient is ≤0.8% RH / s, the moisture removal performance is excellent. When the proportion of fully fluffy flocks is 40% or less and is less than 60%, the dehumidification efficiency η is 65% or less and is less than 80%, and the cumulative humidity gradient is 0.8% RH / s or less than 1.2% RH / s, the dehumidification performance is good. When the proportion of flattened tufts is ≥30%, the dehumidification efficiency η is <50%, and the cumulative humidity gradient is ≥2.0% RH / s, the dehumidification performance is poor.

[0012] In a second aspect, a down jacket moisture-wicking performance testing device is provided, comprising an environmental chamber, an endoscope, a humidity sensor, an airflow sensor, a robotic arm, and a controller; The environmental chamber is used to pre-condition the temperature and humidity of the down jacket with a moisture removal structure, and then adjust the temperature and humidity to preset test values; The robotic arm is used to perform multi-point clamping and multi-mode stretching on the velvet bag to simulate the motion state of the human body; The endoscope is vertically inserted into the middle layer of the velvet bag and is used to collect image data of the velvet inside the velvet bag during the stretching process; The humidity sensor is arranged on the layer of the velvet bag close to the human body, and is used to collect humidity data of the layer of the velvet bag close to the human body during the stretching process; The airflow sensor is provided at the outlet of the velvet bag dehumidification structure and is used to collect airflow velocity data at the outlet of the dehumidification structure; The controller is respectively connected to the environmental chamber, endoscope, humidity sensor, airflow sensor, and robotic arm, and is used to control the environmental chamber and the robotic arm to perform corresponding operations, and to analyze the state of the tufts based on the acquired image data of the tufts, calculate the dehumidification efficiency and humidity cumulative gradient based on the acquired humidity data and airflow velocity data, and obtain the dehumidification performance test results based on the tuft state, dehumidification efficiency, and humidity cumulative gradient.

[0013] Furthermore, the robotic arm is a six-axis robotic arm.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention pre-conditions the temperature and humidity of a down jacket with a moisture-wicking structure, adjusts the temperature and humidity to preset test values, and performs multi-point clamping and multi-mode stretching on the down jacket to simulate a human motion state. This allows the moisture-wicking performance of the down jacket to be tested in motion, resulting in more accurate test results. (2) The present invention obtains the image data of the tufts inside the tuft bag during the stretching process, the humidity data of the layer of the tuft bag close to the human body, and the air flow velocity data at the outlet of the dehumidification structure, and analyzes the state of the tufts based on the image data of the tufts, and calculates the dehumidification efficiency and the humidity cumulative gradient based on the humidity data and the air flow velocity data. On the one hand, by establishing an evaluation system such as tuft state monitoring and dehumidification efficiency, the dehumidification efficiency is quantified, and the test sensitivity is improved by 30% compared with the traditional moisture resistance test sensitivity. On the other hand, by observing the influence of the tuft state on the dehumidification structure, the design defects can be accurately located, and it is helpful to guide process improvements. For example, by verifying that the filling structure with different filling angles can improve the dehumidification efficiency by 22%; (3) The present invention establishes a three-dimensional relationship between down structure change, airflow path and humidity diffusion based on the down cluster state, moisture removal efficiency and humidity accumulation gradient, and then evaluates the moisture removal performance of the down jacket based on the evaluation matrix to obtain the moisture removal performance test results with high test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 1 is a flow chart of a method for testing moisture-wicking performance of a down jacket according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a velvet bag according to an embodiment of the present invention; Figure 3 is a schematic diagram of a moisture removal structure in an embodiment of the present invention; Figure 4 is a schematic diagram of another moisture removal structure in an embodiment of the present invention; Figure 5 Schematic diagram of the installation structure of the endoscope and the sensor in an embodiment of the present invention; Figure 6 Schematic diagram of a robotic arm stretching a velvet bag to simulate human motion in an embodiment of the present invention; Marked in the figure: 1. Endoscope; 2. Humidity sensor; 3. Airflow sensor. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0017] It should be noted that, in the description of the present invention, the terms "front", "back", "left", "right", "up", "down", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0018] Example 1

[0019] like Figure 1 As shown, this embodiment provides a method for testing the moisture-wicking performance of a down jacket, comprising the following steps: Perform pre-temperature and humidity control on down jacket bags with moisture-wicking structures, and then adjust the temperature and humidity to the preset test values; The velvet bag is clamped at multiple points and stretched in multiple modes to simulate the motion of the human body; Obtain image data of the down inside the velvet bag during stretching, humidity data of the layer of the velvet bag close to the human body, and air flow velocity data at the outlet of the moisture removal structure; Analyze the status of the velvet based on its image data, and calculate the dehumidification efficiency and humidity accumulation gradient based on the humidity data and air flow velocity data; The moisture removal performance test results are obtained based on the state of the tufts, moisture removal efficiency and humidity accumulation gradient.

[0020] Example 2

[0021] This embodiment provides a down jacket moisture removal performance testing device, including an environmental chamber, an endoscope, a humidity sensor, an airflow sensor, a robotic arm, and a controller; The environmental chamber is used to pre-condition the temperature and humidity of the down jacket with a moisture removal structure, and then adjust the temperature and humidity to preset test values; The robotic arm is a six-axis robotic arm, which is used to perform multi-point clamping and multi-mode stretching of the velvet bag to simulate the motion state of the human body; The endoscope is vertically inserted into the middle layer of the velvet bag and is used to collect image data of the velvet inside the velvet bag during the stretching process; The humidity sensor is arranged on the layer of the velvet bag close to the human body, and is used to collect humidity data of the layer of the velvet bag close to the human body during the stretching process; The airflow sensor is provided at the outlet of the velvet bag dehumidification structure and is used to collect airflow velocity data at the outlet of the dehumidification structure; The controller is respectively connected to the environmental chamber, endoscope, humidity sensor, airflow sensor, and robotic arm, and is used to control the environmental chamber and the robotic arm to perform corresponding operations, and to analyze the state of the tufts based on the acquired image data of the tufts, calculate the dehumidification efficiency and humidity cumulative gradient based on the acquired humidity data and airflow velocity data, and obtain the dehumidification performance test results based on the tuft state, dehumidification efficiency, and humidity cumulative gradient.

[0022] Example 3

[0023] Based on Example 1 and Example 2, this embodiment provides a method for testing the moisture-wicking performance of a down jacket, and the specific steps are as follows: Step 1: Figure 2 As shown, a fleece bag with a moisture removal structure is prepared. The direction, angle, size and other parameters of the moisture removal structure can be different, such as Figure 3 The moisture-wicking structure of the flight feathers shown in the figure is as follows: Figure 4 The staggered three-dimensional wall moisture removal structure is shown. The down bag is filled with white duck down with a down content of 85-90% and a fill power of more than 800FP.

[0024] Step 2: Figure 5 As shown, an endoscope 1 is placed inside the velvet bag. Specifically, the endoscope 1 is vertically inserted into the middle layer of the velvet bag. A humidity sensor 2 is placed on the side of the lower layer of the velvet bag close to the human body, and an airflow sensor 3 is placed at the outlet of the moisture removal structure of the velvet bag.

[0025] Step 3: Place the aforementioned velvet bag in the environmental chamber. The controller controls the environmental chamber to adjust the temperature to 34-35°C and the humidity to 25-35% RH to complete the pre-temperature and humidity control process. Then, maintain the temperature of the environmental chamber at 34-35°C and adjust the humidity to 85-95% RH to prepare for the test.

[0026] Step 4: Figure 6 As shown, a controller controls a six-axis robotic arm to perform multi-point gripping and multi-mode stretching of the velvet bag to simulate human motion. During the stretching process, an endoscope captures real-time image data of the velvet inside the bag and transmits this data to the controller. A humidity sensor collects real-time humidity data of the layer of the velvet bag close to the human body during stretching and transmits this data to the controller. An airflow sensor collects real-time airflow velocity data at the outlet of the moisture removal structure and transmits this data to the controller.

[0027] In this embodiment, a six-axis robotic arm is used to clamp the velvet bag in the upper, lower, left, right, front, and back positions, and three stretching modes are used alternately for 4.5 to 5 minutes. The three stretching modes include: (1) Vertical compression mode, used to simulate arm swing compression, with an operating frequency of 1-1.1 Hz and a stroke of 5-5.5 cm; (2) Horizontal reciprocating mode, used to simulate trunk twisting, with an operating frequency of 0.5-0.6 Hz and a stroke of 8-8.5 cm; (3) Multi-directional random vibration mode, used to simulate irregular operation, with an operating amplitude of 2.5~3.5cm.

[0028] Step 5: Analyze the down bud state based on the acquired down bud image data. Specifically, the YOLOv5 algorithm is used to identify down bud states using down bud feature maps of different sizes. If the down bud diameter is greater than 4mm, the bud is considered fully fluffy; if the down bud diameter is 2mm≤≤4mm, the bud is considered semi-fluffy; and if the down bud diameter is less than 2mm, the bud is considered flattened.

[0029] Step 6: Calculate the dehumidification efficiency and humidity cumulative gradient based on the acquired humidity data and airflow velocity data. Specifically, the calculation formula for the dehumidification efficiency η is: ; Where V_out represents the volume flow rate in m 3 / s; V_in represents the initial humidity rising rate, the unit is %RH / s; in, ; ; Where v represents the peak air velocity at the outlet of the dehumidification structure, in m / s; M represents the effective area of ​​the dehumidification hole, in cm 2 , that is, 10-4 m²; ΔRH represents the change in humidity from the start of exercise to Δt (in seconds), expressed in % RH; The calculation formula of the humidity cumulative gradient G is: G ; Where, It represents the average value of humidity change every Δt1 (in seconds) in the steady state, in %RH / s. In this embodiment, the steady state refers to the period of 3-5 minutes after exercise, and Δt1=10s.

[0030] Step 7: Get the moisture removal performance test results based on the velvet state, moisture removal efficiency, and humidity accumulation gradient. The comprehensive evaluation matrix is ​​as follows: When the proportion of fully fluffy down is ≥60%, the moisture removal efficiency η is ≥80%, and the cumulative humidity gradient is ≤0.8% RH / s, the moisture removal performance is excellent. When the proportion of fully fluffy flocks is 40% or less and is less than 60%, the dehumidification efficiency η is 65% or less and is less than 80%, and the cumulative humidity gradient is 0.8% RH / s or less than 1.2% RH / s, the dehumidification performance is good. When the proportion of flattened tufts is ≥30%, the dehumidification efficiency η is <50%, and the cumulative humidity gradient is ≥2.0% RH / s, the dehumidification performance is poor.

[0031] Example 4

[0032] Step 1: Prepare a down bag with a moisture-wicking structure. The down bag specifications are: 30 x 30 cm (simulating a single garment), filled with 90% white duck down, with a fill power of 800 FP. Laser-punched moisture-wicking holes are placed 2 cm from the edge of the outer fabric of the down bag, with a 0.8 mm (±0.05 mm) hole diameter and a density of 20 holes / cm², arranged in a dense hexagonal pattern.

[0033] Step 2: Vertically insert an endoscope (Olympus IPLEX NX (Φ2.8mm) with a sampling frequency of 30fps) into the middle layer of the fleece bag. Place an ibutton (±1.5%RH) micro humidity sensor (10Hz) on the lower side of the fleece bag, closest to the body. Place an Omron D6F-P (±0.05m / s) micro airflow sensor (20Hz) at the outlet of the fleece bag's moisture removal mechanism.

[0034] Step 3: Place the velvet bag in the environmental chamber. The controller controls the environmental chamber to adjust the temperature to 34°C and the humidity to 30% RH to complete the pre-temperature and humidity control process. Then, maintain the temperature of the environmental chamber at 34°C and adjust the humidity to 90% RH to prepare for the test.

[0035] Step 4: The controller controls the six-axis robotic arm to clamp and stretch the fleece bag in multiple modes, up and down, left and right, front and back, to simulate human motion. Specifically, a vertical compression mode (operating at a frequency of 1 Hz and a stroke of 5 cm), a horizontal reciprocating mode (operating at a frequency of 0.5 Hz and a stroke of 8 cm), and a multi-directional random vibration mode (operating at an amplitude of 3 cm) are alternated for 5 minutes. All instruments are turned on, and visual, humidity, and airflow data are observed and recorded during the test, as shown in Table 1.

[0036] Step 5. Based on the data recorded in step 4, the method of step 5 of embodiment 3 is used to calculate the relevant test data. The results are shown in Table 1 below.

[0037] Table 1 Test data and results

[0038] Step 6: The moisture removal performance test results are obtained based on the state of the tufts, moisture removal efficiency, and humidity accumulation gradient. The evaluation results are shown in Table 2 below.

[0039] Table 2 Comprehensive evaluation table

[0040] As shown in Table 2, the moisture-wicking performance of the velvet bag was excellent. Structural effectiveness was verified by laser punching, which focused airflow through the holes without causing clump blockage. A process improvement suggestion could be made: increasing the hole density from 20 holes / cm² to 25 holes / cm² could further reduce the humidity gradient.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for testing the moisture-wicking performance of down jackets, characterized in that: The following steps are involved: Perform pre-temperature and humidity control on down jacket bags with moisture-wicking structures, and then adjust the temperature and humidity to the preset test values; The velvet bag is clamped at multiple points and stretched in multiple modes to simulate the motion of the human body; Obtain image data of the down inside the velvet bag during stretching, humidity data of the layer of the velvet bag close to the human body, and air flow velocity data at the outlet of the moisture removal structure; Analyze the status of the velvet based on its image data, and calculate the dehumidification efficiency and humidity accumulation gradient based on the humidity data and air flow velocity data; The moisture removal performance test results are obtained based on the state of the tufts, moisture removal efficiency and humidity accumulation gradient.

2. The method for testing the moisture-wicking performance of down jackets according to claim 1, wherein: The down bag is filled with white duck down with a down content of 85-90% and a fluffiness of more than 800FP.

3. The method for testing the moisture-wicking performance of down jackets according to claim 1, wherein: The pre-temperature and humidity control treatment includes: adjusting the temperature of the environment chamber where the velvet bag is located to 34-35°C and the humidity to 25-35%RH, so that the temperature and humidity of the velvet bag are balanced; The adjusting the temperature and humidity to the preset test values ​​includes: maintaining the temperature of the environmental chamber at 34-35° C. and adjusting the humidity to 85-95% RH.

4. The method for testing moisture-wicking performance of down jackets according to claim 1, wherein: The multi-point clamping and multi-mode stretching of the velvet bag includes: clamping the velvet bag at the top, bottom, left, right, front and back positions, and using three stretching modes alternately for 4.5 to 5 minutes.

5. The method for testing the moisture-wicking performance of down jackets according to claim 4, wherein: The three stretching modes include: Vertical compression mode, used to simulate arm swing compression, with an operating frequency of 1-1.1 Hz and a stroke of 5-5.5 cm; Horizontal reciprocating mode, used to simulate trunk twisting, with an operating frequency of 0.5-0.6 Hz and a stroke of 8-8.5 cm; Multi-directional random vibration mode is used to simulate irregular operation, with an operating amplitude of 2.5~3.5cm.

6. The method for testing moisture-wicking performance of down jackets according to claim 1, wherein: Analyzing the state of the velvet buds based on the velvet bud image data includes: using the YOLOv5 algorithm to identify the state of the velvet buds through velvet bud feature maps of different sizes; Among them, if the diameter of the down is greater than 4mm, the down is in a completely fluffy state; if the diameter of the down is 2mm≤the diameter of the down ≤4mm, the down is in a semi-fluffy state; if the diameter of the down is less than 2mm, the down is in a flattened state.

7. The method for testing moisture-wicking performance of down jackets according to claim 1, wherein: The calculation formula of the moisture removal efficiency η is: ； Where V_out represents the volume flow rate, and V_in represents the initial humidity rise rate; in, ; ; Where v represents the peak air velocity at the outlet of the moisture removal structure, M represents the effective area of ​​the moisture removal hole, and ΔRH represents the humidity change from the start of movement to Δt. The calculation formula of the humidity cumulative gradient G is: G ； Where, It represents the average value of humidity change every Δt1 in steady state.

8. The method for testing moisture-wicking performance of down jackets according to claim 1, wherein: The moisture removal performance test results obtained according to the velvet state, moisture removal efficiency and humidity accumulation gradient include: When the proportion of fully fluffy down is ≥60%, the moisture removal efficiency η is ≥80%, and the cumulative humidity gradient is ≤0.8% RH / s, the moisture removal performance is excellent. When the proportion of fully fluffy flocks is 40% or less and is less than 60%, the dehumidification efficiency η is 65% or less and is less than 80%, and the cumulative humidity gradient is 0.8% RH / s or less than 1.2% RH / s, the dehumidification performance is good. When the proportion of flattened tufts is ≥30%, the dehumidification efficiency η is <50%, and the cumulative humidity gradient is ≥2.0% RH / s, the dehumidification performance is poor.

9. A down jacket moisture dissipation performance testing device, characterized in that: Includes environmental chamber, endoscope, humidity sensor, airflow sensor, robotic arm and controller; The environmental chamber is used to pre-condition the temperature and humidity of the down jacket with a moisture removal structure, and then adjust the temperature and humidity to preset test values; The robotic arm is used to perform multi-point clamping and multi-mode stretching on the velvet bag to simulate the motion state of the human body; The endoscope is vertically inserted into the middle layer of the velvet bag and is used to collect image data of the velvet inside the velvet bag during the stretching process; The humidity sensor is arranged on the layer of the velvet bag close to the human body, and is used to collect humidity data of the layer of the velvet bag close to the human body during the stretching process; The airflow sensor is provided at the outlet of the velvet bag dehumidification structure and is used to collect airflow velocity data at the outlet of the dehumidification structure; The controller is respectively connected to the environmental chamber, endoscope, humidity sensor, airflow sensor, and robotic arm, and is used to control the environmental chamber and the robotic arm to perform corresponding operations, and to analyze the state of the velvet according to the acquired image data of the velvet, calculate the dehumidification efficiency and humidity cumulative gradient according to the acquired humidity data and airflow velocity data, and obtain the dehumidification performance test results according to the velvet state, dehumidification efficiency, and humidity cumulative gradient.

10. The down jacket moisture dissipation performance testing device according to claim 9, characterized in that: The robotic arm is a six-axis robotic arm.

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