Novel backpack shoulder strap with stretch-expansion material liner

Abstract

The invention discloses a novel backpack shoulder strap with a stretch-expansion material liner. The novel backpack shoulder strap comprises two parts including a common outer-layer shoulder strap material and a stretch-expansion liner material, and is characterized in that the common shoulder strap material serves as an outer-layer material, the stretch-expansion material serves as a shoulder strap liner material and is enwrapped in the common outer-layer shoulder strap material, and the problem that a shoulder strap liner is compressed during shouldering is avoided by using the stretch-expansion characteristic of the stretch-expansion material. By applying the novel backpack shoulder strap disclosed by the invention, the backpack shoulder strap is not different from a common shoulder strap in a normal state, but during shouldering, the shoulder strap is under tensional stress, and the stretch-expansion material in the shoulder strap can expand under the action of stretching to effectively fill up the inner space enwrapped by the outer-layer shoulder strap and avoid the phenomenon of stress concentration caused by stretch compression of a common liner material, so that the novel backpack shoulder strap is more comfortable, fits a human body, keeps the contact area between a shoulder and the shoulder strap, and ensures that the pressure of a backpack is uniformly distributed on the shoulder to reduce the burden on the shoulder.

Description

technical field [0001] The invention relates to a backpack shoulder strap with an auxetic material lining. Background technique [0002] Teenagers have to carry schoolbags to and from school every day. According to a survey in my country, the average weight of schoolbags for primary school students is 4.2 kg, and some can reach more than 6 kg, which is more than 15% of their own body weight. Overweight schoolbags will affect the growth and health of young people's spine, internal organs, knees, ankle joints, etc. Epidemiological surveys have pointed out that the common low back pain, neck and shoulder muscle pain and numbness among young people are related to the weight of the schoolbag and the endorsement. The length of the package time is closely related. [0003] Studies have shown that school bags are more likely to injure the shoulders than the back. Heavy schoolbags oppress the shoulders, which may affect blood flow and strain the shoulder muscles, so the shoulder st...

AI Technical Summary

Problems solved by technology

In order to increase comfort, a layer of lining is usually placed inside the shoulder straps of the backpack, but when the shoulder straps of the backpack are stretched, the lining inside will shrink, and the inferior lining will even be squeezed together, changing the shoulder shape. With the original shape, the pressure is concentrated on the tight part, increasing the burden on the shoulders

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