The arrival of summer vacation symbolizes the "season change" of schoolbags and stationery. Are you planning to change your child's schoolbag for a new one? Do you know what kind of schoolbag is safe and comfortable?
As one of the students' school supplies, the double-shoulder schoolbag is the most important load tool for going to and from school every day, and has become an important factor affecting students' development and healthy growth.
Regarding the weight of the double-shoulder schoolbag, domestic and foreign scholars have conducted a series of studies, suggesting that the weight of the double-shoulder schoolbag (including the items placed in the double-shoulder schoolbag) should not exceed 10% to 15% of the student's body weight.
At present, many double-shoulder schoolbags on the market have unreasonable structure design, uneven pressure distribution, and unscientific gravity transmission, which leads to many students suffering from low back pain, idiopathic scoliosis, excessive hunchback, lordosis and other musculoskeletal system diseases. As something that children do not leave their bodies every day when they go to school and leave school, schoolbags are not only related to their physical health, but some unreasonable designs may also bring danger to children.
Form a bad body shape
The child's bones are relatively soft and unformed, and are in the growth and development stage. Overweight schoolbags will pull the child's shoulders back, and the child will unconsciously lean forward, which will lead to hunchback, chest, and even scoliosis and high and low shoulders over time.
Affect physical development
The originally straight scoliosis will affect the development of height. For girls, scoliosis can also easily lead to uneven breast development on both sides and protruding ribs on one side.
Hidden safety hazards
For example, although the tie rod schoolbag liberates children's shoulders, it also has some drawbacks. If children pull the schoolbag and play on the road, they can easily trip over the tie rod. Long-term use of one hand to pull the tie rod can also lead to asymmetric force, affecting the development of spine, muscles and bones.
Therefore, when buying a schoolbag, you must not only look at the "appearance". Parents must grasp the details and take good care of their children's health and safety.
In response to the existing problems in the domestic backpack market, Celtic Intelligent Design Studio (hereinafter referred to as KLART) has developed an elastic decompression backpack suitable for use in sports, using an innovative design of double springs to improve the comfort and stability of the backpack in sports.
The research on double-shoulder schoolbags mainly focuses on two aspects: one is objective evaluation, such as the pressure at different contact positions and the stability when carrying; the other is subjective evaluation, such as fit and comfort.
The staff of Shanghai Fengyou Biomechanics Laboratory used the SPI vest pressure distribution test system and the Qualisys 3D motion capture system to conduct functional tests and collect relevant data for two KLART elastic decompression backpacks and a control group schoolbag (the test subject is not displayed due to copyright issues).
The SPI vest-style pressure distribution test system can detect the pressure at different positions when the subject is carrying the schoolbag. The sensor is composed of a soft resistance woven fabric. When the sensor is under pressure, the circuit is turned on to obtain the pressure value through the change of resistance. The software will display it in two-dimensional and three-dimensional images, allowing us to see the pressure change more intuitively.
Qualisys 3D motion capture system is used to detect the movement of the trunk when carrying the schoolbag through optical technology implementation. Optical motion capture generally requires pasting reflective points at key positions of the target object, and using high-speed infrared cameras to capture the movement trajectory of the reflective points on the target object, so as to monitor the movement of the trunk when carrying the schoolbag.
It can be seen from the collected data that the pressure of the KLART elastic decompression schoolbag during exercise is lower than that of the ordinary schoolbag (the lower the average pressure on the shoulder, the smaller the force on the shoulder). When running, the KLART elastic decompression schoolbag has a lower range of shaking from side to side and higher stability than the ordinary schoolbag.
Write at the end: School bags are a necessity for children to go to school, carrying the love and hope of parents, but school bags are really heavy, and the "double reduction" policy has been introduced. We sincerely hope that the burden on children can be effectively reduced, starting from school bags becoming lighter.
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