how are bullet proof vests made
this will tell you all cbout the bullet proof vests
the way bullet proof vests are made
Bulletproof vests are modern light armor specifically designed to protect the wearer's vital organs from injury caused by firearm projectiles. To many protective armor manufacturers and wearers, the term "bulletproof vest" is a misnomer. Because the wearer is not totally safe from the impact of a bullet, the preferred term for the article is "bullet resistant vest."
Over the centuries, different cultures developed body armor for use during combat. Mycenaeans of the sixteenth century B.C. and Persians and Greeks around the fifth century B.C. used up to fourteen layers of linen, while Micronesian inhabitants of the Gilbert and Ellice Islands used woven coconut palm fiber until the nineteenth century. Elsewhere, armor was made from the hides of animals: the Chinese—as early as the eleventh century B.C. —wore rhinoceros skin in five to seven layers, and the Shoshone Indians of North America also developed jackets of several layers of hide that were glued or sewn together. Quilted armor was available in Central America before Cortes, in England in the seventeenth century, and in India until the nineteenth century.
Mail armor comprised linked rings or wires of iron, steel, or brass and was developed as early as 400 B.C. near the Ukrainian city of Kiev. The Roman Empire utilized mail shirts, which remained the main piece of annor in Europe until the fourteenth century. Japan, India, Persia, Sudan, and Nigeria also developed mail armor. Scale armor, overlapping scales of metal, horn, bone, leather, or scales from an appropriately scaled animal (such as the scaly anteater), was used throughout the Eastern Hemisphere from about 1600 B.C. until modern times. Sometimes, as in China, the scales were sewn into cloth pockets.
Brigandine armor —sleeveless, quilted jackets—consisted of small rectangular iron or steel plates riveted onto leather strips that overlapped like roof tiles. The result was a relatively light, flexible jacket. (Earlier coats of plates in the twelfth-century Europe were heavier and more complete. These led to the familiar full-plate suit of armor of the 1500s and 1600s.) Many consider brigandine armor the forerunner of today's bulletproof vests. The Chinese and Koreans had similar armor around A.D. 700, and during the fourteenth century in Europe, it was the common form of body armor. One piece of breast-plate within a cover became the norm after 1360, and short brigandine coats with plates that were tied into place prevailed in Europe until 1600.
With the introduction of firearms, armor crafts workers at first tried to compensate by reinforcing the cuirass, or torso cover, with thicker steel plates and a second heavy plate over the breastplate, providing some protection from guns. Usually, though, cumber-some armor was abandoned wherever firearms came into military use.
Experimental inquiry into effective armor against gunfire continued, most notably during the American Civil War, World War I, and World War II, but it was not until the plastics revolution of the 1940s that effective bulletproof vests became available to law enforcers, military personnel, and others. The vests of the time were made of ballistic nylon and supplemented by plates of fiber-glass, steel, ceramic, titanium, Doron, and composites of ceramic and fiberglass, the last being the most effective.
Ballistic nylon was the standard cloth used for bulletproof vests until the 1970s. In 1965, Stephanie Kwolek, a chemist at Du Pont, invented Kevlar, trademark for poly-para-phenylene terephthalamide, a liquid polymer that can be spun into aramid fiber and woven into cloth. Originally, Kevlar was developed for use in tires, and later for such diverse products as ropes, gaskets, and various parts for planes and boats. In 1971, Lester Shubin of the National Institute of Law Enforcement and Criminal Justice advocated its use to replace bulky ballistic nylon in bulletproof vests. Kevlar has been the standard material since. In 1989, the Allied Signal Company developed a competitor for Kevlar and called it Spectra. Originally used for sail cloth, the polyethylene fiber is now used to make lighter, yet stronger, nonwoven material for use in bulletproof vests along-side the traditional Kevlar
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the materials to make vest
A bulletproof vest consists of a panel, a vest-shaped sheet of advanced plastics polymers that is composed of many layers of either Kevlar, Spectra Shield, or, in other countries, Twaron (similar to Kevlar) or Bynema (similar to Spectra). The layers of woven Kevlar are sewn together using Kevlar thread, while the nonwoven Spectra Shield is coated and bonded with resins such as Kraton and then sealed between two sheets of polyethylene film.
The panel provides protection but not much comfort. It is placed inside of a fabric shell that is usually made from a polyester/cotton blend or nylon. The side of the shell facing the body is usually made more comfortable by sewing a sheet of some absorbent material such as Kumax onto it. A bulletproof vest may also have nylon padding for extra protection. For bulletproof vests intended to be worn in especially dangerous situations, built-in pouches are provided to hold plates made from either metal or ceramic bonded to fiberglass. Such vests can also provide protection in car accidents or from stabbing.
Various devices are used to strap the vests on. Sometimes the sides are connected with elastic webbing. Usually, though, they are secured with straps of either cloth or elastic, with metallic buckles or velcro closures.