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Applications 

Form requirements
  1. The cap top of the shell should be strengthened. It can be made of light or top rib structure. Shell made no cap along, along, or curling.
  2. Plastic cap liner should be made after the hoop structure, can freely adjust the headband size (sub-pull adjustment buttons to adjust the knob to adjust, etc.).
  3. No later hoop cap liner is made under the chin with a "Y", after the hoop, made of a single permit.
  4. headband contact head portion of the forehead, to breathable, absorbent.
  5. The cap liner hoop around the strip can be made, or block, and leave space for air circulation.
  6. helmet manufacturer must be strictly in accordance with GB2811-2007 national standards for production.
  7. Y class does not allow lateral pressure helmet, helmet just because Y class protection on a straight line from the impact of the next damage caused, not by the protective side pressure.
Pressure principle
Helmet can withstand the pressure mainly by three principles:
  1. The shock absorbing effect: 25 ~ 50mm gap between the cap shell and cap liner, when the object hit the helmet, cap shell without deformation due to a direct impact on the top of the head.
  2. Dispersing stress: cap shell is oval or hemispherical, smooth surface, when the object falling on the cap shell, the object can not travel immediately fall; and the force applied by the cap shell hit the point of transfer to the surrounding, by reducing the buffer cap lining the force of up to two-thirds of the rest of the force transmission to a human skull cap lining through the entire area, so put the focus became the focus plane, thus avoiding the impact on the cap shell at a point of stress concentration, reduce the force per unit area.
  3. Biomechanics: GB prescribed helmet must absorb 4900N. This is because biological experiments, human cervical spine at the maximum force limit, exceeding this limit will hurt the cervical spine, the light causes paralysis, severe life-threatening.
Low quality helmets dangers:
    Some low quality helmets but Christians have their tables, and can not play a protective role. In the choice of materials, lining design failed to reach the national standard requirements, you receive the impact, can not be deformed, stress dispersion. If you select these products, if there is an accident at work, the user's head will produce great harm, causing light concussion, severe life-threatening.
Regulatory
  1. helmets Purchase: businesses must purchase product certification and safety signs products, the product of experience acquired income, are allowed to use.
  2. The helmet should not be stored in: acid, alkali, high temperature, sunlight, humidity and other premises, but can not put together and hard objects.
  3. Validity of helmets: from the date of completion of product manufacturing.
Twigs knit cap not exceeding two years.
Plastic caps, paper, plastic cap of no more than two and a half.
Glass fiber reinforced plastic (polyvinyl alcohol steel) rubber cap of no more than three and a half.
  4. Enterprises should be based on "labor protection supervision and management regulations" (State Administration of Work Safety Order No. 1) The provisions of the helmet due to conduct random testing, qualified only after continued use, after sample testing once a year, no sample testing qualifying the batch helmet that is scrapped.
  5. The safety production supervision and management departments at all levels of the helmet due to supervise and urge enterprise security technology sector inspection qualified before use.
Flag Packaging
  1. Every helmets should have the following four permanent signs:
     A manufacturer's name, trademark, model;
     B manufacturing year, month;
     C Production certification and verification;
     D production license number.
  2. helmet factory packing, each cap should be paper or plastic film bag liner to do good and then into the carton. Dress
Into the tank helmet must be finished.
  Note should be marked product name, quantity, weight, volume and other considerations, etc. 3. box on.
  4. Carton helmets are to be attached to the specification.
  5. helmets marked as "D" mark is a helmet having insulating properties.