bulletproof vest

Bulletproof Vest

------Presented By----- JOTISH CHANDRA ROY

ID:12132107059 8th Intake

Section:02BUBT

A ballistic vest or bullet-resistant vest, often called a bulletproof vest

Is an item of personal armor  Helps to absorb the impact and reduce or

prohibit penetration to the body from firearm-fired projectiles and save from explosions.

Introduction

In 1538, Francesco Maria Della Rovere commissioned Filippo Negroli to create a bulletproof vest. In 1561, Maximilian II, Holy Roman Emperor is recorded as testing his armor against gun-fire.

One of the first commercially sold bulletproof armor was produced by a tailor in Dublin, Ireland in the 1840s. The Cork Examiner reported on his line of business in December 1847.

History

Components of Bullet Proof Vest:

Commercially used are

Kevlar Spectra zylon Nomex ,carbon Mostly used material for bulletproof vest is Kevlar. Kevlar is not used in pure form because it has

some drawbacks. Use of Spectra for vests is also increasing now a

days.

Raw Materials:

Drawbacks of using Pure Kevlar fiber:Advantages Blended fabric Wool &Kevlar:

Drawbacks of using pure kevlar

Blended fabric of Wool and Kevlar:

It is degraded by the UV Rays. Low stability under wet conditions . • Therefore, Kevlar is blended with a natural

fiber which is mostly Wool.

Advantages: Better tear strength Better energy absorbing

capacity reduced number of layers

in a vest. Better breathability feels good on skin. Restricts the

displacement of Kevlar yarns under the impact of bullet.

To make Kevlar, the polymer poly-para-phenylene terephthalamide is first produced in the laboratory. This is done through a process known as polymerization. The resultant crystalline liquid is then extruded through a spinneret to form Kevlar yarn. The Kevlar yarn then passes through a coagulation bath to help it harden.

Manufacturing of Kevlar Filament:

Vests designed for bullets which isdeformable and provide little protection against blows from sharp implements, such as knives,arrows or ice picks, or from bullets manufactured of non-deformablematerials, e.g., those containing a steel core instead of lead. textile vests may be augmented with metal

(steel or titanium), ceramic or polyethylene platestextile composits that provide extra protection to vital

areas.

Ballistic Panels

The cloth is then laid outon the cutting table. Layers of fabric depends on the protection needed. Minimum 8 layers are used and maximum 25. Layers are cut with a cutting machine according

to the shape required.

Cutting the Panels for Vest:

Panels are stitched by Standard Industrial Sewing machines using the Kevlar

thread. These panels are then placed in a Garment which is of shape of a garment. Number of layers of fabric define the strength of vest against bullet.

Stitching of the panels:

Accessories are sewn on the vest such as Straps etc.

A size tag is also attached on the vest. The finished vest is then boxed to the customer.

Finishing the Vest:

How bullet is Resisted?

When a bullet strikes body armor, it is caught in a “web” of very strong fibers. These fibers absorb and disperse the impact energy that is transmitted to the bullet proof vest from the bullet, causing the bullet to deform or “mushroom.”

Used by Army, Police, Security agencies, Famous Personalities etc.

Applications:

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