Infrared safety belt applied to infrared visual detection of normative wearing of safety belt

Abstract

The invention discloses an infrared safety belt applied to normative wearing of an infrared visual detection safety belt. The safety belt comprises warp yarns and weft yarns, the warp yarn comprises first polyester FDY high-tenacity yarn and second polyester FDY high-tenacity yarn, the first polyester FDY high-tenacity yarn is the polyester FDY high-tenacity yarn with the reflectivity larger than or equal to 70%, and the second polyester FDY high-tenacity yarn is the polyester FDY high-tenacity yarn with the reflectivity lower than 30%; according to the black or colored infrared safety belt produced by the preparation method, the identification degree under an infrared camera can be greatly improved, and the problem of misjudgment under the condition that the infrared camera detects a safety belt system due to insufficient light or passenger clothes and a braid are made of the same material is solved.

Description

Technical Field

[0001] This invention relates to an infrared safety belt for use in infrared visual detection to ensure proper wearing of safety belts, and belongs to the fields of textile technology or traffic safety assurance technology. Background Technology

[0002] As a passive safety system component, car seat belts are installed inside the vehicle. During emergency braking or a collision, they restrict the wearer's body movement to prevent or mitigate injury. Existing seat belt warning systems use pressure or mechanical sensor switches within the seat belt buckles. When the seat belt is not inserted into the buckle, the switch is off, and the system identifies this as "not wearing a seat belt." Simultaneously, the Body Control Module (BCM) or related electronic control unit combines the seat belt switch status with driving data; if it determines the driver is not wearing a seat belt, it activates a buzzer alarm.

[0003] However, this alarm system has flaws. For example, it cannot detect if a passenger inserts the seatbelt but is not actually wearing it or is wearing it improperly. It is an indirect monitoring method with vulnerabilities, and the system also requires wiring harnesses under the seat and in the center console. With the development of the automotive industry, monitoring seatbelt wearing status through cameras is more direct, but cameras are prone to misjudgment at night or in poor lighting conditions.

[0004] Because most car seat belts on the market are made of polyester, and the clothing worn by passengers is also commonly made of polyester, and most of it is probably dyed with disperse dyes, if the passenger's clothing and the seat belt are made of the same material, then the reflectivity under the infrared spectrum will be the same. Therefore, even infrared cameras cannot completely identify whether the passenger's seat belt is worn properly at night.

[0005] Therefore, the present invention aims to provide an effective seat belt solution that eliminates false alarms, based on existing infrared camera recognition alarm systems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide an infrared safety belt for use in infrared visual inspection to ensure proper wearing of safety belts, thereby solving the problem.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: an infrared safety belt for infrared visual detection of the standardized wearing of safety belts, wherein the safety belt comprises warp yarns, weft yarns, and edge yarns; The warp yarns include a first polyester FDY high-strength yarn and a second polyester FDY high-strength yarn, wherein the first polyester FDY high-strength yarn is a polyester FDY high-strength yarn with a reflectance greater than or equal to 70%, and the second polyester FDY is a polyester FDY high-strength yarn with a reflectance less than 30%.

[0008] Preferably, the first polyester FDY high-strength yarn and the second polyester FDY high-strength yarn are matched in a 1 / 7 / 1 distribution pattern, that is, the middle part of the seat belt is woven with 7 strands of the second polyester FDY high-strength yarn to form a low infrared reflection zone, and 1 strand of the first polyester FDY high-strength yarn is woven on both sides of the second polyester FDY high-strength yarn to form a high infrared reflection zone; or, the middle part of the seat belt is woven with 7 strands of the first polyester FDY high-strength yarn to form a high infrared reflection zone, and 1 strand of the second polyester FDY high-strength yarn is woven on both sides of the first polyester FDY high-strength yarn to form a low infrared reflection zone; the weave is 2 / 2 twill, and it is knitted with double hook knitting, and the production equipment is a high-speed shuttleless weaving machine or a computer jacquard weaving machine.

[0009] Preferably, the strength of both the first polyester FDY high-strength yarn and the second polyester FDY high-strength yarn is >6.8 CN / Dtex.

[0010] Preferably, the seat belt is a black seat belt, and the seat belt is prepared by the following method: It is prepared using a weaving-then-dyeing process, that is, the first polyester FDY high-strength yarn is dyed after weaving is completed; then it is processed. High-temperature setting and elongation setting: Set the oven temperature and processing time, and set the speed ratio before and after the belt feed according to the product elongation requirements; Finishing and strip removal: The process involves reduction cleaning, steaming, water washing, semi-drying and condensation, and functional finishing. After completion, the strip is cooled and removed.

[0011] Preferably, the seat belt is a non-black seat belt, and the seat belt is prepared by the following method: The yarn was prepared using a dyeing-then-weaving process, and the second polyester FDY high-strength yarn underwent material modification. High-temperature setting and elongation setting: Set the oven temperature and processing time, and set the speed ratio before and after the belt feed according to the product elongation requirements; Finishing and strip removal: The process involves reduction cleaning, steaming, water washing, semi-drying and condensation, and functional finishing. After completion, the strip is cooled and removed.

[0012] Preferably, the second polyester FDY high-strength yarn is modified by the following steps: the fiber is modified by utilizing the low reflectivity of carbon black; furthermore, when color matching the low reflectivity yarn in the non-black seat belt, more than 0.01% of carbon black solution is added and mixed with disperse dyes or pigments to control the reflectivity below 30%, and the high reflectivity part is colored with normal disperse dyes to maintain high reflectivity.

[0013] Preferably, the high-temperature setting and elongation of the black safety belt are set as follows: heat treatment in an oven at 180℃-230℃ for 2-4 minutes, and different speed ratios before and after belt insertion are set according to the product elongation requirements.

[0014] Preferably, the high-temperature shaping and elongation of the non-black safety belt are set as follows: heat treatment in an oven at 120℃-160℃ for 2-4 minutes, and different speed ratios before and after belt insertion are set according to the product elongation requirements.

[0015] Preferably, the reduction cleaning adopts a one-dip-one-roll method. The reduction cleaning solution is a mixture of caustic soda, sodium hydrosulfite, and water in a certain proportion, and the roller pressure is 1-4 bar. Steaming is carried out in a high-pressure steam box at a temperature of 90°C-105°C for 2-4 minutes for color fixing. Water washing is carried out in a multi-section continuous water washing box with a hot water temperature of 60°C-90°C. The pH value of the water tank is adjusted to 4-6 with acetic acid or citric acid for 2-5 minutes. Semi-drying and condensation are carried out in an oven at a temperature of 105°C-140°C to semi-dry the safety belt after water washing. After drying, the belt is cooled with cold air until the surface temperature is below 70°C. Functional finishing and belt removal are carried out by first diluting and preparing the functional finishing agent, dipping and rolling the webbing once, drying it at 120-160°C for 2-5 minutes, and finally cooling and removing the belt.

[0016] Preferably, the high-reflectivity yarn of the non-black seat belt is made of polyester yarn with a reflectivity higher than 70% at an infrared wavelength of 800nm-1200nm, and a specification of 1000D or 1500D. Beneficial effects The black or colored infrared seat belts produced by this invention using this preparation method can significantly improve the recognition under infrared cameras, solving the problem of misjudgment by infrared camera detection seat belt systems due to insufficient light or the fact that the occupant's clothing is made of the same material as the webbing. By utilizing the different images presented by different materials under an infrared spectrometer, the recognition of existing seat belts under infrared cameras is improved, while ensuring the safety, comfort, and personalization of the seat belts during application. Attached Figure Description

[0017] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the second polyester fiber of the present invention under infrared spectroscopy. Figure 2 This is a schematic diagram of the test of the first polyester fiber of the present invention under infrared spectroscopy. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0019] Please see Figures 1-2 This invention provides an infrared safety belt technical solution for infrared visual detection of standardized seat belt wearing: the safety belt is divided into two categories: black infrared safety belt and non-black infrared safety belt, both including warp yarns, weft yarns, and edge yarns. The warp yarns include a first polyester FDY high-strength yarn and a second polyester FDY high-strength yarn, wherein the first polyester FDY high-strength yarn is a polyester FDY high-strength yarn with a reflectivity greater than or equal to 70%, and the second polyester FDY is a polyester FDY high-strength yarn with a reflectivity less than 30%; specifically as follows: Both black and non-black infrared safety belts have at least two yarns with an infrared reflectivity exceeding 70%. Preferably, the warp yarns of the safety belts are uniformly 750D-1500D, the weft yarns are 250D-1000D, and the selvedge yarns are 50D-250D. Furthermore, both use a 1 / 7 / 1 distribution of the first and second polyester FDY high-strength yarns. That is, the middle section of the safety belt is woven with seven strands of the second polyester FDY high-strength yarn to form a low infrared reflectivity zone, while one strand of the first polyester FDY high-strength yarn is woven on both sides of the second polyester FDY high-strength yarn to form a high infrared reflectivity zone, enhancing the contour boundary during infrared imaging and facilitating detection by the system. The weave is a 2 / 2 twill, double-crocheted, and the production equipment is a high-speed shuttleless weaving machine or a computerized jacquard weaving machine. It is worth mentioning that the above-mentioned weaving process is not merely to meet basic infrared recognition requirements, but is deeply synergistic with the overall manufacturing method, ultimately bringing unexpected technological and application advantages, as detailed below: The first polyester FDY high-strength yarn is fixed to both edges of the webbing in a 1 / 7 / 1 ratio, combined with a tightly interwoven 2 / 2 twill weave, creating a "double-line profile" in infrared imaging. Even in scenarios involving rapid occupant movement (such as leaning forward during sudden braking), partial wrinkles in the seatbelt, or partial obstruction by clothing, the infrared system can still quickly lock the overall direction of the webbing through the high-reflectivity edges on both sides. In actual testing, this setup improved recognition continuity by nearly 100% in complex scenarios. Simultaneously, the 1 / 7 / 1 ratio (one portion of high-reflectivity yarn on each side and seven portions of low-reflectivity yarn in the middle) precisely complements the material modification process: the seven portions of second polyester FDY high-strength yarn in the middle form a stable low-reflectivity base, while the high-reflectivity yarns on both sides (the first polyester FDY high-strength yarn) create a strong reflective contrast; alternatively, the middle section of the seatbelt is woven with seven of the first polyester FDY high-strength yarns to form a high infrared reflectivity zone, with one second polyester FDY high-strength yarn woven on each side of the first polyester FDY high-strength yarn to form a low infrared reflectivity zone. This proportional design avoids the problems of excessively bright infrared imaging due to an excessively high proportion of the first polyester FDY high-strength yarn, and blurred outlines due to an excessively low proportion. It is also compatible with high-temperature setting processes (180-230℃ for black, 120-160℃ for non-black). The edge distribution of the first polyester FDY high-strength yarn ensures more uniform heating of the webbing during setting, and the difference in shrinkage rate between the edge and center yarns is controlled within 0.3%, further ensuring the stability of infrared reflectivity. Ultimately, this achieves a near-zero misjudgment rate in extreme scenarios such as nighttime and low light. Furthermore, the 2 / 2 twill weave, through a 2-up, 2-down interlacing of warp and weft yarns combined with tight weaving using double-hook needles, increases the webbing's breaking strength by 15%-20% compared to plain weave. Combined with the requirement in the preparation method to select polyester FDY high-strength yarn with a strength >6.8CN / Dtex for the warp yarns, the final product's breaking strength is further improved, far exceeding the automotive seat belt regulations (≥6.8CN / Dtex). Meanwhile, the interlacing gaps in the twill weave are smaller than those in the plain weave. During the material modification process (adding carbon black to non-black yarn), this prevents carbon black particles from falling off due to excessively large weave gaps, ensuring the reflectivity stability of the second polyester FDY high-strength yarn. In particular, the infrared reflection characteristics of the seatbelts designed with this process (high reflectivity at the edges and a low reflectivity substrate in the center) are highly compatible with the resolution of mainstream infrared cameras on the market (detection wavelengths of 800-1200nm). The infrared system can directly identify the seatbelts without adjusting the focal length, exposure parameters, or adding algorithm modules, avoiding the additional costs of modifying the detection equipment to fit the seatbelts.

[0020] Example 1, Preparation of a black seat belt: Yarn selection: Low-reflection yarn is selected from polyester black yarn with a reflectance of 4.2% at an infrared wavelength of 800nm-1200nm, specification 1200D; high-reflection yarn is selected from polyester white yarn, specification 1200D. The difference in infrared reflectance between the two is significant, and they can be distinguished without additional modification.

[0021] Process sequence: The high-reflectivity polyester white yarn adopts the "weave first, dye later" process. It is first mixed with low-reflectivity black yarn in a ratio of 1 / 7 / 1 for weaving (white yarn on both sides of the edge and black yarn in the middle). After weaving, the white yarn part is dyed and reinforced to ensure color stability.

[0022] Weaving parameters: warp yarn specification 1200D, weft yarn specification 500D, selvedge yarn specification 100D; adopts 2 / 2 twill weave, and is woven on a high-speed shuttleless weaving machine using double hook needles, with the weaving speed controlled at 300 rpm to ensure uniform weave density.

[0023] High-temperature setting and elongation setting: Setting parameters: Place the woven webbing into an oven, set the temperature to 200℃, and heat treat for 3 minutes to ensure the webbing structure is stable and not easily deformed.

[0024] Elongation control: Based on the product elongation requirements (≤5%), the feed rate is set to 1.2m / min and the output rate to 1.15m / min. The elongation of the webbing is controlled by the rate difference to avoid stretching and deformation during subsequent use.

[0025] Organizing and unloading: Reduction cleaning: The cleaning solution is prepared according to the ratio of caustic soda: sodium hydrosulfite: water = 2:1:100. The roller pressure is 2 bar. After immersion and padding, residual impurities and floating color on the surface of the webbing are removed.

[0026] Steam fixation: The webbing is placed in a high-pressure steam box at 95℃ for 3 minutes to fix the color, thereby improving the color fastness of the dyed parts of the black yarn and white yarn and preventing fading.

[0027] Water washing: The water is washed in a three-section continuous water washing tank at a hot water temperature of 75°C. The pH value of the water tank is adjusted to 5 with citric acid, and the water washing time is 3 minutes to thoroughly remove residual cleaning solution.

[0028] Semi-drying and condensation: The oven temperature is 120℃ to semi-dry the webbing (moisture content controlled within 10%); after drying, it is cooled with 25℃ cold air to reduce the surface temperature of the webbing to 65℃ to avoid high temperature damage to the webbing.

[0029] Functional finishing and tape removal: Dilute the polyurethane functional finishing agent at a ratio of 1:10, dip and roll the webbing once, and then dry it in a 140℃ oven for 3 minutes to improve the abrasion resistance of the webbing; finally, cool the webbing to room temperature and roll it up in 50m / roll to complete the preparation.

[0030] Example 2, Preparation of a red infrared safety belt (non-black): Step 1, Seatbelt Design: Yarn selection: Low-reflection yarn is made of conventional red polyester yarn, specification 1200D; high-reflectivity yarn is made of red polyester yarn with a reflectivity of 73.8% at an infrared wavelength of 800nm-1200nm, specification 1200D. The two yarns have the same initial color and need to be modified to create a difference in reflectivity.

[0031] Process sequence: Both high-reflectivity and low-reflectivity red yarns adopt the "dye-then-weave" process. First, dyeing and modification treatments are completed separately, and then they are woven together in a 1 / 7 / 1 ratio (high-reflectivity yarns on both sides of the edge and low-reflectivity yarns in the middle).

[0032] Weaving parameters: Same as the black infrared safety belt, warp yarn 1200D, weft yarn 500D, selvedge yarn 100D, twill 2 / 2 weave, woven on a high-speed shuttleless loom at a speed of 300 rpm.

[0033] Material modification: Modification was performed only on low-reflectivity red yarn: 0.01% carbon black stock solution (polyester chip stock solution) was added during the color matching stage to improve infrared reflectivity. It was then mixed with red disperse dye and stirred evenly before dyeing the yarn. The final infrared reflectivity was controlled at 4.2% (<30%). High-reflectivity red yarn was dyed with normal red disperse dye, maintaining a reflectivity of 73.8%. The two formed a clear reflection difference, which could create a distinct pattern under an infrared camera.

[0034] High-temperature setting and elongation setting: Setting parameters: Because non-black dyes have low heat resistance, the oven temperature is set at 140℃ and the heat treatment time is 3 minutes to prevent dye failure and color fading.

[0035] Elongation control: Consistent with the black infrared safety belt, the belt entry speed is 60m / min and the belt exit speed is 62m / min, ensuring that the elongation is ≤10%.

[0036] Organizing and unloading: Reduction cleaning: The cleaning solution formula and padding method are the same as those for black safety belts (caustic soda: sodium hydrosulfite: water = 2:1:100, roller pressure 2 bar), focusing on removing residual carbon black particles on the surface of low-reflectivity yarn.

[0037] Steam fixation: The high-pressure steam box temperature is 95℃, and the fixation treatment is carried out for 3 minutes to improve the adhesion of red dye and prevent color fading during use.

[0038] Washing: The washing chamber temperature is 75℃, the pH value is adjusted to 5 (citric acid), and the washing time is 3 minutes to remove residual dyes and carbon black impurities.

[0039] Semi-drying and condensation: The oven temperature is 120℃. After semi-drying, the temperature is lowered to 65℃ with 25℃ cold air to prevent the red color from darkening due to high temperature.

[0040] Functional finishing and tape removal: Silicone oil functional finishing agent (1:10 dilution) is used. After the webbing is "dipped and rolled", it is dried at 140℃ for 3 minutes to improve the smoothness of the webbing. Finally, it is cooled to room temperature and rolled up in 50m rolls.

[0041] See Figure 2 In Example 2, the modified low-reflectivity red yarn was tested using an infrared spectrometer.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An infrared safety belt applied to infrared visual detection of safety belt normative wearing, characterized in that: The safety belt comprises warp yarns, weft yarns and selvedge yarns; The warp yarns comprise first polyester FDY high-strength yarns and second polyester FDY high-strength yarns, wherein the first polyester FDY high-strength yarns are polyester FDY high-strength yarns with a reflectivity of greater than or equal to 70%, and the second polyester FDY high-strength yarns are polyester FDY high-strength yarns with a reflectivity of less than 30%.

2. The infrared safety belt applied to infrared visual detection of safety belt normative wearing according to claim 1, characterized in that: The first polyester FDY high-strength yarns and the second polyester FDY high-strength yarns are arranged in a 1 / 7 / 1 distribution mode, i.e., seven second polyester FDY high-strength yarns are knitted in the middle part of the safety belt to form a low-infrared-reflection zone, and one first polyester FDY high-strength yarn is knitted on both sides of the second polyester FDY high-strength yarns to form a high-infrared-reflection zone; or, seven first polyester FDY high-strength yarns are knitted in the middle part of the safety belt to form a high-infrared-reflection zone, and one second polyester FDY high-strength yarn is knitted on both sides of the first polyester FDY high-strength yarns to form a low-infrared-reflection zone; the fabric is arranged in a twill 2 / 2 pattern and knitted by using double-hooked knitting needles, and the production equipment is a high-speed shuttleless fabric belt machine or a computerized jacquard fabric belt machine.

3. The infrared safety belt applied to infrared visual detection of safety belt normative wearing according to claim 1, characterized in that: The strength of the first polyester FDY high-strength yarns and the second polyester FDY high-strength yarns is greater than 6.8 CN / Dtex.

4. The infrared safety belt applied to infrared visual detection of safety belt normative wearing according to claim 2, characterized in that: The safety belt is a black safety belt, and the safety belt is prepared by the following method: The safety belt is prepared by using a weaving-first-and-dyeing-later process, i.e., the first polyester FDY high-strength yarns are dyed after weaving is completed, and then High-temperature setting and elongation setting: the oven temperature, treatment time, and the speed ratio before and after entering the belt are set according to the elongation requirement of the product; Finishing and belt falling: the reduction cleaning, steaming, washing, semi-drying, condensation, and functional finishing process are used, and the belt is fallen after cooling.

5. The infrared safety belt applied to infrared visual detection of safety belt normative wearing according to claim 2, characterized in that: The safety belt is a non-black safety belt, and the safety belt is prepared by the following method: The safety belt is prepared by using a dyeing-first-and-weaving-later process, and the second polyester FDY high-strength yarns are subjected to material modification; High-temperature setting and elongation setting: the oven temperature, treatment time, and the speed ratio before and after entering the belt are set according to the elongation requirement of the product; Finishing and belt falling: the reduction cleaning, steaming, washing, semi-drying, condensation, and functional finishing process are used, and the belt is fallen after cooling.

6. The infrared safety belt applied to infrared visual detection of safety belt normative wearing according to claim 5, characterized in that: The second polyester FDY high-strength yarns are subjected to material modification by the following steps: the fibers are modified by using the low-reflectivity characteristic of carbon black; further, when the color of the low-reflectivity yarns in the non-black safety belt is adjusted, carbon black with a concentration of more than 0.01% is mixed with a disperse dye or a pigment to control the reflectivity to be less than 30%, and the normal disperse dye is used to color the high-reflectivity part to maintain high reflectivity.

7. The infrared safety belt for infrared visual detection of belt wearing according to claim 4, characterized in that: The high-temperature setting and elongation setting of the black safety belt are as follows: the safety belt is heat-treated in an oven at 180-230℃ for 2-4 min, and the speed ratio before and after entering the belt is set according to the elongation requirement of the product.

8. The infrared safety belt applied to infrared visual detection of safety belt normative wearing according to claim 5, characterized in that: The high-temperature setting and elongation setting of the non-black safety belt are as follows: the safety belt is heat-treated in an oven at 120-160℃ for 2-4 min, and the speed ratio before and after entering the belt is set according to the elongation requirement of the product.

9. The infrared safety belt applied to infrared visual detection of safety belt normative wearing according to any one of claims 4 or 5, characterized in that: The reduction cleaning adopts one dip and one roll mode, the reduction cleaning liquid is mixed by caustic soda, sodium hydrosulfite and water in proportion, the roller pressure is 1-4 bar; the steaming is carried out in a high-pressure steam box, the temperature is 90-105°C, the fixation treatment is 2-4 min; the washing is through a plurality of continuous washing boxes, the hot water temperature is 60-90°C, the water tank pH value is adjusted to 4-6 by using acetic acid or citric acid, the treatment is 2-5 min; the semi-drying and condensation set the oven temperature to 105-140°C for semi-drying the safety belt after washing, the drying is followed by cooling with cold air to the belt surface temperature below 70°C; the functional finishing and belt falling are first diluted and the functional finishing agent is prepared, the belt is dipped and rolled, and then dried at 120-160°C for 2-5 min, and finally cooled and fallen.

10. The infrared safety belt for infrared visual detection of belt wearing according to claim 5, characterized in that: The high-reflective yarn of the non-black safety belt is selected from polyester yarn with a reflectivity higher than 70% under infrared wavelength 800-1200 nm, and the specification is 1000D or 1500D.

Images