Yuav ua li cas lub tsho tiv thaiv Kevlar cov mos txwv tau dhau los ua qhov tseeb

Thaum ntxov xyoo 1970, DuPont tau tsim Kevlar mos txwv daim ntaub. hauv xyoo 1970s

Nyob rau hauv nruab nrab lub sij hawm, Kevlar tau suav nrog hauv National Institute of Justice ntsuam xyuas qhov kev pab cuam los muab lub cev hnyav hnyav rau cov tub ceev xwm. Kevlar armor tau pom tias muaj sia nyob 95 feem pua ​​​​ntawm lub sijhawm tom qab raug ntaus los ntawm .38 caliber mos txwv taug kev ntawm 800 ft / s. Qhov tshwm sim ntawm kev xav tau kev phais tom qab raug ntaus los ntawm qhov projectile tau pom tias yog 10 feem pua ​​lossis tsawg dua. Xyoo 1975 Richard Amelino, tus tsim ntawm American Body Armor Company

, uas muag tag nrho-Kevlar tsho khuam hu ua K-15, muaj 15 txheej ntawm Kevlar fiber ntau thiab tseem suav nrog 5-inch los ntawm 8-inch ballistic steel phaj uas zaum saum lub plawv. Xyoo 1976

, Richard Davis, tus tsim ntawm Thib Ob Chance Lub Cev Armor, tsim lub tuam txhab thawj tag nrho-Kevlar tsho khuam, tus qauv Y. Lub teeb yuag, kev ua haujlwm zoo heev vest kev lag luam tau pib thiab hloov kho sai rau daim ntawv tshiab ntawm kev tiv thaiv txhua hnub rau cov tub ceev xwm niaj hnub no. Los ntawm nruab nrab mus rau lig 80's, kwv yees li 1/3 txog 1/2 ntawm tag nrho cov tub ceev xwm saib xyuas tau hnav tsho tiv thaiv kev nyab xeeb txhua hnub. Cov fibers ua haujlwm siab dua ib zaug ua pov thawj tias lawv muaj txiaj ntsig zoo hauv kev cawm neeg txoj sia