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The EPS buffer layer is very light, 98% of its components are air, so in addition to buffering, it can also play a good role in heat insulation. Of course, if it comes to summer, it is necessary to maintain air circulation inside the helmet to prevent heat accumulation. Reducing the thickness of the buffer layer or designing vents becomes particularly important. The reduction in the amount of EPS means that the strength of the EPS must be further improved so that it will not be completely broken under the impact of energy. Of course, the price will be higher. At the same time, relative to the buffer layer is thicker, the safety of EPS with no or very small vent design is worse, depending on the needs of the wearer.
Whether it is a single high-hardness EPS or ordinary EPS used for helmet cushioning, it has its limitations. With the continuous development of EPS products and technology, the layered EPS material that combines two different density EPSs has solved the above problems. It can ensure that the EPS outside the buffer layer has higher hardness to resist energy impact, and at the same time, the internal elasticity is better. High EPS has better cushioning effect. In addition, there are other dual-density helmets, and the density of different layers is different.
GPPS plastics are universal grade polystyrene (GPPS), polystyrene (PS) is made of styrene monomer (SM) polymerization, which can be synthesized by a variety of synthesis methods. At present, bulk polymerization and suspension polymerization are mainly used in industry. PS is a thermoplastic non-crystalline resin, which is mainly divided into general-purpose polystyrene (PPS, commonly known as benzene-permeable), impact-resistant polystyrene (hips, commonly known as benzene modified), and expanded polystyrene (EPS).
The impact energy on the wearer's head also depends on the thickness of the EPS buffer layer. Compared with a buffer layer with a thickness of 1 cm, when the thickness of the EPS reaches 3 cm, it will further extend the energy transmission time and make the buffer layer withstand greater impact; and when the EPS buffer layer has a lower density and a thicker layer, If the impact force is not strong, it will extend the energy transmission time instead of reaching the bottom of the buffer layer faster, making the wearer more comfortable. Of course, if the buffer layer is too thick, on the one hand it will affect the appearance, on the other hand, it may also cause other damage in the impact. Therefore, the ideal thickness of the EPS buffer layer must ensure that it is strong enough to adapt to different types of impacts: it has a certain degree of hardness and minimizes the energy conduction on the premise of avoiding damage; and it has a certain degree of elasticity. Plays the role of absorbing collision energy in small impact.
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