In the history of modern body armor, the invention of Kevlar, a heat resistant and tightly structured synthetic fiber, by DuPont Co. DD -0.89% in the 1960s was a landmark.
20世纪60年代杜邦公司(DuPont Co.)发明凯夫拉纤维(Kevlar),是现代人体防护装备历史上的一个标志性事件。凯夫拉是一种结构严密、具有阻热性能的合成纤维。
This material has helped reduce the weight of bulletproof vests significantly, compared with those made of chrome and steel in the 19th and early 20th centuries. Kevlar typically gives four-to-five times the strength of steel protection of the same weight.
借助于这种材料,防弹背心的重量相比19世纪和20世纪初期铬、钢制造的防弹衣大大减轻。在重量相同的情况下,凯夫拉的防护能力常常是钢板的四到五倍。
Kevlar has been a ubiquitous part of military and homeland security body armor since the 1980s and it is now also found in a range of other protective items such as motorcycle clothing. Other technologies, such as the ceramic chain-mail-like Dragon Skin, have also found a place in the armor market.
20世纪80年代以来,凯夫拉在军事和国安防护装备中无处不在,现在还存在于摩托车服等其他一系列防护产品之中。其他技术也在防护市场上占据了一席之地,比如像锁子甲一样的陶制龙鳞甲(Dragon Skin)。
Armor products that use Kevlar are able to stop bullets from penetrating the layers of protection. But they are less able to protect the wearer against the mitigated but still considerable direct impact of the bullet's force.
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