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The importance of seat belts to vehicle safety is self-evident. The correct use of seat belts can reduce the injuries caused by car crashes by 60% to 70%, and the mortality rate by about 75%. In order to reduce the displacement of drivers and passengers during car collision and emergency braking, the webbing needs to have high strength, good extensibility, wear resistance, weather resistance and flame retardancy, etc., and continue to be used during the entire life cycle of the car. Will not deteriorate significantly. Depending on the position of the front row or the back row, the requirements for the extensibility of the webbing are also different. Low-elongation fiber is suitable for the webbing used by the front driver and co-pilot, with strong restraint ability; high-elongation fiber is suitable for the webbing used by the rear passengers, providing cushioning and properly absorbing energy. In addition, the webbing should have a smooth surface, antibacterial, color matching with the carriage, and also have requirements for its color fastness to light, wet friction and perspiration.
The influence of fiber raw materials on webbing
The level and stability of fiber raw material performance indicators seriously affect the safety performance and quality of the webbing. Generally, fiber materials with high tensile strength, moderate elongation, and non-deformation are selected, such as high-strength polyester filament and high-strength nylon filament. Nylon has poor lightfastness and was used more in the early days, but now it accounts for a small proportion. At present, polyester industrial filament is mainly used as the raw material for webbing, which has the characteristics of high modulus, low elongation, good thermal performance, good dimensional stability and reasonable cost.
The seat belt webbing is about 2.6 to 3.6 m long, 46 mm wide, and 1.1 to 1.2 mm thick. It is estimated that there is a webbing with a total length of 14m and a weight of 0.8kg in each vehicle. Usually, the warp direction of the webbing is 320 1100 dtex yarns or 260 1670 dtex yarns, and adopts a twill or satin weave structure. The warp yarns are mostly parallel to the plane of the webbing to increase the strength of the webbing and make the surface of the webbing smooth and soft. After finishing the webbing, the fabric shrinks and the weight increases, which can improve its energy absorption performance.
The webbing needs to be soft and flexible in the length direction to bring comfort to the human body; it needs to be stiff in the width direction so that the webbing can easily slide between the buckles and retract smoothly. In addition, the webbing also requires the edge to be wear-resistant but not too hard, otherwise it will affect the comfort of wearing. American safety belt manufacturer Allied Signal has developed a specially designed webbing CARESS, which uses softer 500D yarn at the selvedge. At the same time, studies have pointed out that, compared with twisted silk, the webbing woven with untwisted silk has a higher density, the tensile strength and tear strength of the webbing are improved, and the webbing is softer, smoother, and more flexible. The United States and Japan mostly use untwisted silk to weave webbing, while Europe mostly uses twisted silk to weave.
New R&D ideas and trends
In recent years, research and development ideas such as seat belt systems based on the principle of pressure sensors, airbag seat belts, and webbing with negative Poisson's ratio have also appeared on the market. Sweden AUTOLIV, the world’s largest automotive safety supplier, has developed a seat belt equipped with airbags, which combines the functions of the seatbelt and airbag into one, and has been assembled in Mercedes-Benz. S-Benz) on the S-class sedan. Nissan has developed a smart seat belt that can adjust the restraint of the occupants according to the severity of the collision. With sensors and active safety features, seat belts are becoming more and more "smart".
Xuzhou Heping Chemical Fiber Co., Ltd. is located in Xuzhou, Jiangsu. For many years, it has focused on the research and development and production of polypropylene high-strength yarn. The polypropylene high-strength yarn produced by it has many excellent properties such as light weight, high strength, anti-aging, acid and alkali resistance, which also makes polypropylene high-strength Silk can be used in all aspects of our lives. Heping chemical fiber polypropylene high-strength yarn is supplied by manufacturers, with a complete range of products and high-quality after-sales service. Users can purchase with confidence. Heping Chemical Fiber also has high-quality polypropylene industrial yarn, polypropylene high-strength yarn, high-strength polypropylene network yarn, polypropylene high-strength yarn, high-strength polypropylene yarn and split film industrial yarn.
If you want to know more product information, please contact: Mr. Wang 187 5178 8889 Website: http://yr52c.cn/