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Bullet proof material technology

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NSTC Brings Bullet Proof Material Technology

NSTC Brings Bullet Proof Material Technology

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    Bullet proof material technology Bullet proof material technology Presentation Transcript

    • Bullet ProofmaterialFOR Jackets/vests
    • Bullet Proof Jackets/Vests
      • For everyday use
      • In various attractive designs
      • Able to be worn daily by police, shore patrols, people in life threatening situations (politicians, business leaders, money couriers, civil police force, body guards etc.)
      About the material
      • Ballistic Fabric using pure Kevlar.
      Drawbacks:
      • UV degradation
      • Non-suitability under wet conditions to the vest of wearer
      • Blended fabric of wool and Kevlar
      Advantages:
      • Better tear strength even under wet conditions
      • Better energy absorbing capacity and reduced number of layers of fabric in a vest.
      • Better breathability and feels good on skin.
    • Our technology outline
      • Blended Fabric for bullet proof material
      • Comparison of Pure Kevlar and Blended Fabric
      • Test Protocol & Discussion
    • Objectives
      • To overcome the shortcomings of the synthetic fiber
      • To increase the protection efficiency of the fiber against penetrating bullet
      • To increase the compatibility to the user
    • Ballistic Fabric
      • Synthetic Polyaramid Fibres
      • Commercially used synthetic fibres include Kevlar, Ballistic nylon, Twaron, Spectra and Zylon
      • Having varying degree of protection against projectiles because of low friction and extensibility
      • penetrating projectiles can displace these yarns laterally and causes their failure
    • Impact of Bullet on ballistic fabric
      • The synthetic yarns are displaced by the bullet.
      • Hence, these are not recommended for use under wet conditions
      • To overcome the drawbacks of pure synthetic fibres -a combination of Kevlar with natural fibre is used.
    • Kevlar-Natural Fibre Fabric
      • wool is used in addition to but not as a substitute for Kevlar
      • helps in retaining the energy absorbing properties of the synthetic fibre
      • increases the density of the fabric
      • restricts the displacement of Kevlar yarns under the impact of a bullet
      • increases the frictional interaction at yarn intersections and penetrating bullet comes across a stronger resisting force
      • presence of wool makes much harder fabric for a projectile to break the yarns
      • enhances the wearability and comfort of a vest
      • reduce the number of layers of fabric
      • overall weight of the vest is reduced
    • Kevlar-Wool fabric
      • The number of yarns/cm is determine according to the weight of the fabric and is reflected in the values
    • Results of tear strength tests for pure Kevlar and Kevlar-Wool blend fabrics
    • Results of tear strength tests for pure Kevlar and Kevlar-Wool blend fabrics- contd.
      • Presence of wool enhances the tear strength.
      • Wet fabrics are easier to tear than the dry fabric
      • In both the WARP and WEFT directions, tear strength of wet
      wool blend fabric is higher than that of the dry Kevlar fabric.
      • To break the yarns in wool-kevlar blend would need more energy-
      results in higher energy absorption and more effective in stoppingthe projectile.
    • ballistic tests
      • Sample panels consisting of 18 to 36 layers of either pure Kevlar and/or Kevlar-Wool blend was tested for ballistic properties according to NIJ IIIA standard by minimum of six shots in a set pattern
      • The layer at which a projectile was stopped, is taken as a measure of Back Face Signature against stop layer
      • The average Back Face Signature was 44 mm (Critical BFS)
    • Conclusion
      • Both pure Kevlar and Kevlar blended with wool fabrics is made available for manufacturing vests in India
      • As two separate fabrics would be supplied, it provides an opportunity for manufacturer to use either Kevlar only or Kevlar-wool blend only or a combination of the two
      • Given that weight plays a significant role, it is suggested that a combination of the two fabrics be used
      • For example, 15 layers of Kevlar and about 14 layers of Kevlar-wool with a layer size of 0.6 m2 would weigh about 4344 g.
    • Why NSTC
      • Technological development of Ballistic fabrics
      • Commercialisation of Ballistic fabrics
      • Delivery of Ballistic fabrics(both Kevlar fabric and the blended fabric)
    • Nano Science and Technology Consortium
      A-105, Level-III, Sector-63,
      Noida-201301, U.P., (India).  
       For Queries/Concerns  
      Tel: +91-120- 4781215-17 Mob: +91-9818206463  
      Website: www.nstc.in E-mail: info@nstc.in 
      Chat: Yahoo ID- nstcchat