Intelligent thermal shrinkage rate detection all-in-one machine and method for customizing garment fabric
The integrated intelligent heat shrinkage rate testing machine solves the problems of large footprint, high energy consumption and large error of traditional equipment, and realizes efficient and accurate measurement of fabric heat shrinkage rate.
Patent Information
- Application Number
- CN202511717884.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-21
- Publication Date
- 2026-02-24
AI Technical Summary
Traditional heat shrink testing equipment requires multiple independent devices, which occupy a large area, consume a lot of energy, are inefficient, and are prone to human error, making it difficult to meet the requirements of high-precision quality control.
Design an integrated intelligent heat shrinkage rate testing machine, which includes boiling water, dry heat and wet heat testing chambers. It adopts a transfer robotic arm and camera for automated operation, and combines testing boxes and stamp-style testing icons to achieve automated and accurate heat shrinkage rate measurement.
It reduces energy consumption, improves detection efficiency and accuracy, reduces equipment cost and size, and achieves efficient and accurate measurement of fabric heat shrinkage rate.
Smart Images
Figure CN121558801A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of testing technology for customized clothing fabrics, specifically to an intelligent integrated machine and method for testing the heat shrinkage rate of customized clothing fabrics. Background Technology
[0002] In haute couture, especially in the field of bespoke suits, the requirements for fabric dimensional stability are extremely stringent. During the garment-making process, high-temperature ironing and lining, as well as during customer use such as washing and dry cleaning, all cause irreversible dimensional changes (shrinkage) due to heat. Failure to accurately predict and compensate for this shrinkage will lead to serious quality problems such as garment deformation, uneven shrinkage between the lining and the fabric, and overall silhouette distortion, affecting the wearing experience and brand value.
[0003] Traditional heat shrink testing equipment typically requires three separate devices for boiling water, dry heat, and damp heat testing, which occupy a large area and have high purchase and maintenance costs. Secondly, each device heats independently, and the heat energy is not utilized comprehensively, resulting in high energy consumption. Thirdly, traditional measurements rely on manual timing and measurement marking operations, which are highly subjective, prone to errors, and inefficient, making it difficult to meet the needs of large-scale, high-precision quality control.
[0004] Therefore, there is an urgent need for an integrated, automated, and intelligent testing device to address the aforementioned pain points. Summary of the Invention
[0005] The purpose of this invention is to provide an intelligent integrated machine and method for detecting the heat shrinkage rate of customized clothing fabrics, so as to improve the measurement accuracy and automation level of fabric shrinkage detection operations and reduce energy consumption.
[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows: This intelligent heat shrinkage rate testing machine for customized clothing fabrics includes a testing chamber with an insulated inner wall. Inside the testing chamber are a boiling water testing chamber, a dry heat testing chamber, and a wet heat testing chamber. The dry heat testing chamber is located at the top of the boiling water testing chamber, and the wet heat testing chamber is located on the side of the dry heat testing chamber. Heating components are located at the bottom of both the boiling water testing chamber and the dry heat testing chamber. The boiling water testing chamber, dry heat testing chamber, and damp heat testing chamber have a long strip opening on one side, and a corresponding door is arranged at the testing box. The fabric to be tested is arranged in the testing box. The testing box has a square structure, an open top, and a screen structure that allows air or water to pass through at the bottom. The testing box can be arranged inside the boiling water testing chamber, dry heat testing chamber, or damp heat testing chamber through the corresponding door. The outer end of the test box is provided with a handle structure, and a transfer robotic arm is provided on one side of the test box. The transfer robotic arm is connected to the control host, and a gripping actuator is provided at the front end of the transfer robotic arm. The gripping actuator can be connected to the handle structure and realize the placement and transfer operation of the test box by the transfer robotic arm.
[0007] Furthermore, a heater is arranged inside the testing chamber. The heater is connected to the heating components through pipes and valves. Inside the testing chamber, the heater, boiling water testing chamber, dry heat testing chamber and wet heat testing chamber are arranged in a grid-like structure. The heater and boiling water testing chamber are located at the bottom, and the dry heat testing chamber is located at the top of the boiling water testing chamber.
[0008] Furthermore, the bottom of the damp heat detection chamber is connected to the top of the boiling water detection chamber via an inclined pipe for conveying water vapor.
[0009] Furthermore, a steam rotation chamber is arranged on the side of the damp heat detection chamber, and a water pipe is arranged at the bottom of the steam rotation chamber, which is connected to the side of the top of the boiling water detection chamber.
[0010] Furthermore, the bottom of the heating component of the dry heat detection chamber is located at the top of the boiling water detection chamber, and the bottom of the heating component is provided with heat-conducting fins.
[0011] Furthermore, the left and right sides of the detection box are provided with horizontally arranged cylindrical sliders, and the interiors of the boiling water detection chamber, dry heat detection chamber and wet heat detection chamber are all provided with downwardly inclined grooves. The grooves and sliders can cooperate to allow the detection box to tilt downwards under the restriction of the grooves.
[0012] Furthermore, the outer side of the detection box is provided with a sealing plate, which can seal the hatch when the detection box is tilted and moved downward.
[0013] Furthermore, a detection platform is arranged within the operating range of the transfer robotic arm, and a vertically downward camera is arranged at a fixed height at the center of the detection platform, and the camera is connected to the control host.
[0014] A method for detecting heat shrinkage rate, applied to the aforementioned integrated testing machine, comprising: Inspection icons are arranged on the fabric to be inspected by means of stamping. The icons include a circle and two mutually perpendicular line segments arranged inside the circle. All the stamped fabric pieces are laid flat in their respective testing boxes, and the main unit numbers the corresponding testing boxes. The transfer robotic arm transfers the corresponding numbered test box and fabric into the preheated test chamber, and positions the test box at the bottom of the chute. Place the test kits inside the test chamber until the set temperature, humidity, or time requirements are met. The detection box is removed from the detection chamber by a transfer robotic arm and then placed on the detection table; the center of the detection icon is aligned with the center of the camera. The camera captures an image of the fabric with the current number after the inspection operation. By comparing the current inspection mark with the standard inspection mark, the heat shrinkage value of the fabric in the warp and weft directions is obtained.
[0015] Furthermore, one of the horizontal lines in the detection mark has an arrow icon at the front end, and the two horizontal lines in the detection mark are respectively aligned with the warp and weft directions of the fabric.
[0016] Compared with existing technologies, this solution has the following advantages: This solution integrates the boiling water testing chamber, dry heat testing chamber, wet heat testing chamber, and heater inside the testing chamber through an integrated chamber design. This achieves internal heat insulation and allows for the cascaded recycling of boiling water, steam, and heat, reducing energy consumption. It enables a single device to comprehensively solve the testing operations of three key heat shrinkage processes, greatly improving testing efficiency, reducing energy consumption, and decreasing equipment cost and size. Furthermore, it can provide efficient measurement operations for large-scale fabric heat shrinkage in garment customization. This solution employs automated detection operations under the collaborative control of the host computer, particularly utilizing the handling operations of a transfer robotic arm. This enables automated and precise operations during the detection process, eliminating the need for manual intervention in handling, timing, and measurement calculations. This reduces human error and significantly improves system efficiency and detection accuracy. This solution uses a testing box as the carrier of the fabric. Its bottom has a screen structure, which can conduct heat efficiently and can be immersed in boiling water. When the fabric is laid flat, it can also shrink freely. Therefore, while facilitating testing, it does not affect the shrinkage of the fabric, making the testing and measurement more accurate. At the same time, the testing is carried out by the cooperation of the cylindrical slider and the chute on the outside. When boiling water testing is carried out, it will descend into the boiling water, solving the problem of the difficulty in placing or retracting the fabric in traditional boiling water testing. In addition, the testing box has a sealing plate structure, which can achieve a sealing operation when it is placed in each testing chamber, greatly improving its convenience and heat insulation performance. This solution presents a heat shrinkage rate detection method. It utilizes a fixed-size stamp-like detection icon structure on the fabric. This icon is a combination of a circle and a crosshair within the circle. To ensure consistent testing, the crosshair structure corresponds to the warp and weft threads of the fabric. Arrow icons can be placed along either the warp or weft direction to achieve a standardized and identifiable icon arrangement. During heat shrinkage measurement, a camera at a fixed height photographs the fabric, and the image is compared to the original detection icon structure. Based on pixel ratios, efficient shrinkage rate calculations in both warp and weft directions are achieved, providing efficient and accurate data support for subsequent garment customization. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the all-in-one machine in this solution.
[0018] Figure 2 This is a schematic diagram of the testing box.
[0019] Figure 3 This is a schematic diagram of the internal layout of the testing box.
[0020] Figure 4 This is a schematic diagram of the structure of the transfer robotic arm holding the detection box.
[0021] Figure 5 This is a schematic diagram of the detection box.
[0022] Figure 6 This is a top view of the test box, the fabric to be tested, and the test markings.
[0023] Figure 7 This is a schematic diagram of the internal structure of the testing chamber.
[0024] Figure 8 This is a schematic diagram of the structure in which the test box is arranged inside the dry heat test chamber.
[0025] Figure 9 This is a schematic diagram of the testing station. Detailed Implementation
[0026] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.
[0027] like Figures 1 to 9As shown, an integrated intelligent heat shrinkage rate testing machine for customized clothing fabrics includes a testing chamber 1. The inner wall of the testing chamber 1 is a heat-insulating structure. Typical heat-insulating materials can be rock wool board, aerogel felt, or vacuum insulation board. Appropriate openings can be arranged on the testing chamber 1 to balance the internal and external pressures. Inside the testing chamber 1, there are boiling water testing chamber 11, dry heat testing chamber 12, damp heat testing chamber 13, and heater 10. Temperature sensors are arranged inside the boiling water testing chamber 11, dry heat testing chamber 12, and damp heat testing chamber 13 to obtain their internal temperature. The heater 10 can generate heat energy using electricity or gas (preferably electricity). The heat energy is transferred to other heating components through conduction or convection. Currently, mainstream heaters usually adopt intelligent temperature control systems, which can accurately control the heating temperature and achieve high energy utilization. The boiling water detection chamber 11, dry heat detection chamber 12, damp heat detection chamber 13, and heater 10 are arranged in a grid-like structure inside the detection chamber 1. The heater and boiling water detection chamber are located at the bottom, the dry heat detection chamber is located at the top, and the damp heat detection chamber is located on the side of the dry heat detection chamber. A first heating element 14 is located at the bottom of the boiling water detection chamber 11 to heat the purified water stored inside and bring it to a boil. A second heating element 15 is located at the bottom of the dry heat detection chamber 12. Specifically, the upper part of the second heating element 15 is located at the bottom of the cavity of the dry heat detection chamber 12, and the lower part is located at the top of the cavity of the boiling water detection chamber 11. It has laterally arranged fins 151 on the top of the second heating element 12 for conducting heat and directing the hot airflow to one side.
[0028] The heater 10 transfers or exchanges heat with the first heating element 14 and the second heating element 15 through pipes and valves respectively. Under the control of the controller, it realizes precise heating operation control of the first heating element 14 and the second heating element 15, and finally realizes precise temperature control operation of the dry heat detection chamber 12 and the boiling water detection chamber, and realizes the corresponding technical requirements for fabric shrinkage inspection.
[0029] The bottom of the damp heat detection chamber 13 is connected to the top of the boiling water detection chamber 11 through an inclined channel 16. When the first heating element 14 heats the clean water inside the boiling water detection chamber 11 and makes it boil, the high-temperature water vapor will enter the damp heat detection chamber 13 along the channel 16. At the same time, in order to stably obtain high-temperature water vapor, the second heating element 15 can also be turned on, thereby heating the water vapor or condensate on its surface to generate more water vapor. Under the guidance of the fins 151, it also enters the damp heat detection chamber 13 through the channel 16 to obtain a stable amount of water vapor. On the other hand, when the equipment is not in use, the water vapor in the damp heat detection chamber 13 condenses, and the condensate will flow back to the interior of the boiling water detection chamber 11 through the channel 16.
[0030] In some embodiments, the top of the damp heat detection chamber 13 is connected to a steam rotation chamber 17 for collecting excess water vapor. The bottom of the steam rotation chamber 17 has a drain pipe 18, which is connected to the top of the boiling water detection chamber 11 for conveying condensate into its interior. The other side of the bottom of the steam rotation chamber 18 is connected to a discharge pipe 19, which is arranged in a rotatable manner. Its other end is arranged at the top position on the side of the detection chamber 1 to realize the external discharge of excess water vapor, thereby balancing the internal pressure.
[0031] The testing box 2 is the carrier of the fabric. In this solution, multiple testing boxes 2 with the same structure are arranged. The testing box 2 is a drawer-shaped square structure with an open top and a metal wire mesh structure 21 that can be ventilated or water-permeable at the bottom. If the cutting size of the fabric to be tested is 25×25 cm, then the size of the mesh structure 21 can be 30×30 cm to ensure that the fabric has a margin inside.
[0032] The internal structures of the boiling water testing chamber 11, the dry heat testing chamber 12, and the wet heat testing chamber 13 for placing the testing box 2 are the same. Taking the boiling water testing chamber 11 as an example, specifically, two horizontal support plates 111 made of stainless steel are arranged inside the boiling water testing chamber 11. The distance between the two support plates 111 is the same as the width of the testing box 2. There is a 45-degree inclined slide groove 112 on the front of the support plate 111. Cylindrical sliders 22 are arranged on the frames on the left and right sides of the screen structure 2 of the testing box 2. The distance between the front and rear cylindrical sliders 22 is the same as the distance between the front and rear of the slide groove 112. When the cylindrical sliders 22 enter the corresponding slide groove 112, the testing box 2 will move horizontally downward at a 45-degree angle along the slide groove 112 until the bottom of the slide groove 112 is placed. At this time, the screen structure 21 and the transported cloth will be immersed in the boiling water. Conversely, when the testing box moves upward, the screen structure 21 and the transported cloth will leave the boiling water area.
[0033] The detection box has a connecting rod 23 at the outer end of the frame that matches the slide 112 (45-degree inclination). A sealing plate 24 is arranged at the outer end of the connecting rod 23. The sealing plate 24 plays a sealing role. A handle structure 25 is arranged at the outer end of the sealing plate 24. The handle structure 25 is used to connect the transfer robotic arm 3 for clamping and conveying functions.
[0034] An opening corresponding to the sealing plate 24 is provided on the front side of the boiling water testing chamber 11, the dry heat testing chamber 12, or the wet heat testing chamber 13. A door matching the sealing plate 24 is provided at the corresponding opening of the testing box 1. When the testing box 2 enters the testing box 1 through the door and the opening, and when the testing box 2 is arranged at the bottom of the slide 112, the sealing plate 24 can just seal and isolate the opening and the door.
[0035] The inspection box 1 is equipped with a transfer robotic arm 3 on one side. The transfer robotic arm 3 is connected to the control host. The front end of the transfer robotic arm 3 is equipped with a gripping actuator 31. The gripping actuator 31 can be connected to the handle structure 25. Under the control of the control host, the transfer robotic arm 3 can accurately arrange and transfer the inspection box 2.
[0036] An inspection table 4 is arranged within the operating range of the transfer robotic arm 3. The inspection table 4 can hold the inspection box 2 at the beginning of the shrinkage inspection operation or at the end of the shrinkage inspection operation. A vertically downward camera 41 is arranged at a fixed height on the inspection table 4. The camera 41 is connected to the control host and is used to take pictures of the fabric in the inspection box 2 after the shrinkage inspection operation is completed.
[0037] To achieve precise shrinkage inspection of fabric, inspection icons are stamped onto the fabric to be inspected. Specifically, the inspection icon 5 consists of a circle 51 and two perpendicular line segments 52 arranged inside the circle. An arrow mark 53 is placed at the head of one of the line segments 52. The perpendicular structure of the line segments 52 is consistent with the warp and weft structure of the fabric (in knitted fabrics, it can also be consistent with the general knitting direction and translation direction) to clearly identify the specific warp and weft differences in the fabric shrinkage inspection, thereby improving the accuracy of subsequent garment customization operations. When the fabric to be inspected is cut to a size of 25×25 cm, the diameter of the circle 51 can be 20 cm.
[0038] To improve the accuracy of each inspection, inspection icon 5 can be used to mark the fabric to be inspected through a pre-prepared stamp-like structure, thus improving consistency, convenience and accuracy.
[0039] This solution provides a method for detecting heat shrinkage rate, applied to the aforementioned integrated testing machine, including: The fabrics marked with detection icons 5 are laid flat in their respective detection boxes 2, and the control host numbers the corresponding detection boxes 2. Under the control of the host computer, the transfer robotic arm transfers the corresponding numbered test box and fabric into the preheated test chamber and places the test box at the bottom of the chute. Place the test kits inside the test chamber until the set temperature, humidity, or time requirements are met. The detection box is removed from the detection chamber by a transfer robotic arm and then placed on the detection table; the center of the detection icon is aligned with the center of the camera. The camera captures an image of the fabric with the current number after the inspection operation. By comparing the current inspection mark with the standard inspection mark, the heat shrinkage value of the fabric in the warp and weft directions is obtained.
[0040] Specifically, under the control and processing of the host computer, the camera transfer robotic arm 3 takes out the detection box 2 and places it back on the detection table 4, ensuring that the center of the mark is aligned with the camera. The camera captures the image after detection. Since there is a fixed height between the camera and the fabric, the initial detection mark and the reduced detection mark can be fitted by merging the layers. The image is then subjected to grayscale conversion, noise reduction, and contrast enhancement. The Hough circle transform is used to accurately identify the outline of the circle 41 and locate its center pixel coordinates. The Hough line transform is used to identify the cross line segment 42 and calculate its length (pixel value). Shrinkage calculation: The system converts the pixel size to the pre-calibrated physical size (mm / pixel); Warp shrinkage rate = (Initial warp length - Measured warp length) / Initial warp length × 100%; Latitudinal contraction rate = (Initial latitude length - Post-detection latitude length) / Initial latitude length × 100%; The final output includes a test report containing information such as the serial number, testing conditions, and warp and weft shrinkage rates, thus enabling continuous and efficient fabric shrinkage testing.
[0041] In summary, this solution, through an integrated chamber design, places the boiling water testing chamber, dry heat testing chamber, wet heat testing chamber, and heater inside the testing chamber, achieving internal heat insulation and heat preservation. It also enables the cascaded recycling of boiling water, steam, and heat, reducing energy consumption. This allows a single device to comprehensively solve the testing operations of three key heat shrinkage processes, greatly improving testing efficiency, reducing energy consumption, and decreasing equipment cost and size. Furthermore, it can provide efficient measurement operations for large-scale fabric heat shrinkage in garment customization. This solution employs automated detection operations under the collaborative control of the host computer, particularly utilizing the handling operations of a transfer robotic arm. This enables automated and precise operations during the detection process, eliminating the need for manual intervention in handling, timing, and measurement calculations. This reduces human error and significantly improves system efficiency and detection accuracy. This solution uses a testing box as the carrier of the fabric. Its bottom has a screen structure, which can conduct heat efficiently and can be immersed in boiling water. When the fabric is laid flat, it can also shrink freely. Therefore, while facilitating testing, it does not affect the shrinkage of the fabric, making the testing and measurement more accurate. At the same time, the testing is carried out by the cooperation of the cylindrical slider and the chute on the outside. When boiling water testing is carried out, it will descend into the boiling water, solving the problem of the difficulty in placing or retracting the fabric in traditional boiling water testing. In addition, the testing box has a sealing plate structure, which can achieve a sealing operation when it is placed in each testing chamber, greatly improving its convenience and heat insulation performance. This solution presents a heat shrinkage rate detection method. It utilizes a fixed-size stamp-like detection icon structure on the fabric. This icon is a combination of a circle and a crosshair within the circle. To ensure consistent testing, the crosshair structure corresponds to the warp and weft threads of the fabric. Arrow icons can be placed along either the warp or weft direction to achieve a standardized and identifiable icon arrangement. During heat shrinkage measurement, a camera at a fixed height photographs the fabric, and the image is compared to the original detection icon structure. Based on pixel ratios, efficient shrinkage rate calculations in both warp and weft directions are achieved, providing efficient and accurate data support for subsequent garment customization.
Claims
1. An integrated intelligent heat shrinkage rate testing machine for customized garment fabrics, characterized in that: The test chamber includes a heat-insulating inner wall. Inside the test chamber are a boiling water test chamber, a dry heat test chamber, and a damp heat test chamber. The dry heat test chamber is located at the top of the boiling water test chamber, and the damp heat test chamber is located on the side of the dry heat test chamber. Heating components are located at the bottom of both the boiling water test chamber and the dry heat test chamber. The boiling water testing chamber, dry heat testing chamber, and damp heat testing chamber have a long strip opening on one side, and a corresponding door is arranged at the testing box. The fabric to be tested is arranged in the testing box. The testing box has a square structure, an open top, and a screen structure that allows air or water to pass through at the bottom. The testing box can be arranged inside the boiling water testing chamber, dry heat testing chamber, or damp heat testing chamber through the corresponding door. The outer end of the test box is provided with a handle structure, and a transfer robotic arm is provided on one side of the test box. The transfer robotic arm is connected to the control host, and a gripping actuator is provided at the front end of the transfer robotic arm. The gripping actuator can be connected to the handle structure and realize the placement and transfer operation of the test box by the transfer robotic arm.
2. The intelligent heat shrinkage rate detection integrated machine for customized clothing fabrics according to claim 1, characterized in that: The testing chamber is equipped with a heater, which is connected to the heating components through pipes and valves. Inside the testing chamber, the heater, boiling water testing chamber, dry heat testing chamber and wet heat testing chamber are arranged in a grid-like structure, with the heater and boiling water testing chamber located at the bottom and the dry heat testing chamber located at the top of the boiling water testing chamber.
3. The intelligent heat shrinkage rate detection integrated machine for customized clothing fabrics according to claim 2, characterized in that: The bottom of the damp heat testing chamber is connected to the top of the boiling water testing chamber via an inclined pipe for conveying water vapor.
4. The intelligent heat shrinkage rate detection integrated machine for customized clothing fabrics according to claim 3, characterized in that: A steam rotation chamber is arranged on the side of the damp heat testing chamber, and a water pipe is arranged at the bottom of the steam rotation chamber. The water pipe is connected to the side of the top of the boiling water testing chamber.
5. The intelligent heat shrinkage rate detection integrated machine for customized clothing fabrics according to claim 1, characterized in that: The bottom of the heating element of the dry heat detection chamber is located at the top of the boiling water detection chamber, and the bottom of the heating element is provided with heat-conducting fins.
6. The intelligent heat shrinkage rate detection integrated machine for customized clothing fabrics according to claim 1, characterized in that: The left and right sides of the test box are provided with horizontally arranged cylindrical sliders. The interior of the boiling water test chamber, the dry heat test chamber and the wet heat test chamber are all provided with downward inclined sliding grooves. The sliding grooves can cooperate with the sliders and enable the test box to move downward inclined under the restriction of the sliding grooves.
7. The intelligent heat shrinkage rate detection integrated machine for customized clothing fabrics according to claim 6, characterized in that: The outer side of the detection box is equipped with a sealing plate. When the detection box tilts and moves downward, the sealing plate can seal the door.
8. The intelligent heat shrinkage rate detection integrated machine for customized clothing fabrics according to claim 1, characterized in that: A detection platform is arranged within the operating range of the transfer robotic arm. A vertically downward camera is positioned at a fixed height at the center of the detection platform, and the camera is connected to the control host.
9. A method for detecting heat shrinkage rate, applied to the intelligent heat shrinkage rate detection integrated machine for customized garment fabrics as described in any one of claims 1 to 8, characterized in that: Includes the following steps: Inspection icons are arranged on the fabric to be inspected by means of stamping. The icons include a circle and two mutually perpendicular line segments arranged inside the circle. All the stamped fabric pieces are laid flat in their respective testing boxes, and the main unit numbers the corresponding testing boxes. The transfer robotic arm transfers the corresponding numbered test box and fabric into the preheated test chamber, and positions the test box at the bottom of the chute. Place the test kits inside the test chamber until the set temperature, humidity, or time requirements are met. The detection box is removed from the detection chamber by a transfer robotic arm and then placed on the detection table; the center of the detection icon is aligned with the center of the camera. The camera captures an image of the fabric with the current number after the inspection operation. By comparing the current inspection mark with the standard inspection mark, the heat shrinkage value of the fabric in the warp and weft directions is obtained.
10. A method for detecting heat shrinkage rate according to claim 9, characterized in that: The front end of one of the horizontal lines in the inspection mark is an arrow icon, and the two horizontal lines in the inspection mark are aligned with the warp and weft directions of the fabric.