What are the applications of stretching and what are the ways of stretching?

Tensile testing machines are widely used in metrology and quality inspection; rubber plastics; metallurgical iron and steel; mechanical engineering; electrical and electronics; automobile production; textile chemical fiber; wires and cables; packaging materials and food; instrumentation; medical devices; civil nuclear energy; Civil aviation; Colleges and universities; scientific research laboratories; Commodity inspection and arbitration, technical supervision department; building materials ceramics; Petrochemical and other industries. As an important part of the instrument, different materials require different fixtures, which is also an important factor in whether the test can be carried out smoothly and the accuracy of the test results. The tensile testing machine is widely used in all kinds of hardware, metal, rubber and plastic, footwear, leather, clothing, textile, insulator, wire, cable, terminal and other materials to test its tensile, tearing, peeling, compression, bending and other data research and development, inspection and testing, work...

Uniaxial tensile is an important means to improve the strength of chemical fibers. The stretch ratio of a fiber is usually defined by the ratio of the length of the fiber before and after it is stretched. As the tensile ratio increases, so does the modulus and strength of the fiber.

In the spinning process, it is desirable to generate as much of the straightened chain structure as possible to produce high-strength, high-modulus synthetic fibers (such as polyarylamide fibers). When the film is uniaxially stretched, the strength parallel to the stretching direction increases with the increase of the stretching ratio. However, the strength perpendicular to the tensile direction decreases, and highly uniaxial stretch films can even lead to microfibrillation of polymers.

Therefore, it is also a method of making fibers. Biaxial stretching is an important method to improve the properties of polymer films or sheets. Biaxial stretching can be used to prevent the disadvantage of the deterioration of strength in the plane of the film perpendicular to the tensile direction when uniaxial stretching, and the products of biaxial stretching have greater tensile strength and impact toughness than those without stretching.

Therefore, biaxially stretched films can be used for film substrates and tape substrates for audio tapes, video tapes, etc., which require high performance.

Here's how:1. Static stretching is slow and continuous, the suitable time is 10-30 seconds, because the action is gentle and not easy to produce stretch reflex, so it is safer than other types of stretching, can be used as a "universal stretching", static stretching is not recommended before training.

2. Dynamic stretching is a kind of functional stretching exercise, which uses specialized movements as a physical preparation activity, and it is recommended to use dynamic stretching before training and static stretching after training.

3. Elastic stretching includes an active muscle force process, which can be used as a warm-up before preparing for exercise, but elastic stretching may damage muscles or connective tissues, especially for people who often do not exercise or people with old injuries on the body, and are more suitable for athletes.

4. PNF stretching is extended for flexibility training of athletes, and the stretching effect is very good.

Stretching is nothing more than changing the length of the muscles, whether dynamic or static, there is an obvious stretching effect. However, the specific type of stretching depends on the current condition of the body, so that it is more targeted and effective.

1. Sit on the ground, straighten your legs tightly, hook your feet, slowly pull the soles of your feet with both hands (note that the soles of your feet should be hooked to your head as much as possible, and your knees can not be bent) and lean forward slightly (don't hunched over), try to pull your heels off the ground a little bit, put them down after 3 seconds, and come again. Repeat 10 times. Do it once a day, you must stick to it to have an effect, don't be too strong, and be tough.

2. Stretch the muscles of the back of the thigh: sit on the ground, straighten the leg to be stretched in front of the body, bend the other leg, the outside of the whole leg is close to the ground, form a triangle with the straight leg, the back is straight, bend forward as far as possible from the crotch, grab the toes of the straightened leg with both hands, and hold this position for 20 minutes. Grasp both ankles with both hands, hold this position, count 10, relax, and repeat 3 times.

3. Stretch the inner thigh muscles - method 2 sitting, straighten and separate your feet in front of your body, keep your back and knees straight, bend forward from your hips, grab the ankles of your legs with both hands from the inside of your legs, keep this position, feel your inner thighs being tightened, relax, and then repeat. Stretch the calf (back) muscles and lean over, support the body with both arms and one leg (straight, toes on the ground), bend the other leg in front of the body and relax, the center of gravity of the body is concentrated on the toes of the supporting foot, the heel is back and down, feel the muscles in the back of the calf being tightened, keep the branch empty tap in a tense state, count 10, relax, repeat 3 times, and then switch to the other leg to do 3 times.

1.Improves blood circulation, stretching can help blood circulation flow more smoothly, reduce atrophy and muscle soreness.

2.Relieves stress and calms emotions, stretching has an excellent effect on physical relaxation, and helps to relieve physical and mental stress and enhance mental tenacity.

Stretching is an important exercise preparation, which can effectively improve the indicators of the body and bring better exercise performance and experience, but there is a degree of stretching, professional stretching, more professional stretching knowledge is recommended to go to the tallplus official website to check the mold socks, there is a lot of help.