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  • Bulletproof VestGROUP 5

    LOW ZHI MING

    WONG WEN JIE DOUGLAS

    1

  • Table of Contents General Overview

    Synthesis of polymer

    Processing of Polymer

    Manufacturing of Product

    Summary

    References

    2

  • General Overview

    3

  • 4

  • General OverviewWhat constitutes a bulletproof vest?

    Absorbs impact from fire-arm projectiles

    Prevents projectiles and fragments from penetrating through

    Light weight but tough

    Utilizes layers of strong fiber (Kevlar)

    5

  • How does it work? Bullet caught in a web of strong fibers

    Fibers absorb and disperse the impact

    Bullet is deformed

    Additional energy absorbed by each successive layer

    6

  • What is Kevlar? A registered trademark for a para-aramid synthetic fiber

    Poly(p-phenylene terephthalamide), PPTA

    Belong to the group of polyamides

    Different grades of Kevlar

    7

  • Properties of KevlarAdvantages

    High tensile to weight strength

    High structural rigidity

    High heat resistance

    Resistance to low temperature

    High chemical resistance

    Low electrical conductivity

    Insoluble in water

    8

    Disadvantage

    Suffer from ultra violet light degradation

  • Properties of Kevlar

    9

  • Synthesis of Polymer

    10

  • Synthesis of Polymer

    +

    n

    + (2n-1) HCl

    para-phenylenediamine terephthaloyl chloride poly(p-phenylene terephthalamide)

    Step polymerization, condensation reaction

    Solvent used: N-methyl-pyrrolidone and calcium chloride

    Occurs under anhydrous conditions, between -15o C and 30o C

    nn

    11

  • Processing of Polymer

    12

  • Processing of Polymer Dry jet-wet spinning

    Polymer in concentrated sulfuric acid solution(~20% polymer)

    Extrusion and quenching

    Proceed in the bath while undergoing stretch

    Withdrawn from bath and wound up

    Subsequent washing step to remove residue acid solvent

    13

  • 14

  • Manufacturing of Bulletproof Vest

    15

  • Manufacturing of Product Making of panel cloth

    Twisting fibres into yarns

    Weaving in a simple pattern

    16

  • 17

  • Manufacturing of Product Cutting of the panels

    Fabric is first unrolled onto a cutting table that must be long

    As many layers as required are laid out on table

    Cut sheets placed on layers of cloth

    Cutting wheel tool

    18

  • Manufacturing of Product Sewing of the ballistic panels

    Worker places stencil on top of layers

    Rubs chalk on exposed areas of panel

    Sewer stitches layers together

    Size label

    Finishing the vest

    Shells for panels sewn together in same factory

    Panels slipped into shells

    Accessories sewn on

    Boxed up and shipped to the customer

    19

  • Applications Bodywork of F1 racing cars

    Walking boots

    Canoe

    Military helmet

    Backplate of Motorola smartphone

    Ropes & cables

    Tactical vests

    Bow of violin

    20

  • Summary

    21

  • Summary

    Poly (p-phenylene terephthalamide) is made by step polymerization

    Dry jet-wet spinning is used for processing of Kevlar

    Manufacturing steps include fabric roll production, cutting into panels, sewing up stacked panels and completion of whole vest

    22

  • Referenceshttp://compositeswiki.org/kevlar/

    http://www2.dupont.com/Personal_Protection/en_GB/assets/PDF/Kevlar%C2%AE%20Technical%20Guide.pdf

    http://www.madehow.com/Volume-1/Bulletproof-Vest.html

    http://books.google.com.sg/books?id=AYjFoLCNHYUC&pg=PA482&lpg=PA482&dq=wet+spinning+kevlar+process&source=bl&ots=GP0uQw7rDA&sig=xcphLUe9v2OX7BlCZ1jD-xD9BJg&hl=en&sa=X&ei=by8PU-qOLauRigebs4CwCQ&ved=0CCcQ6AEwAA#v=onepage&q=wet%20spinning%20kevlar%20process&f=false

    http://textilesupdate.com/french-machinery-at-techtextil-frankfurt

    http://www.youtube.com/watch?v=eRabvfq8TdA

    http://www.youtube.com/watch?v=S_jXAddQDnM

    http://www.youtube.com/watch?v=6vSaw1esxLY

    http://www.youtube.com/watch?v=CDfehw6LIR0

    23

    http://compositeswiki.org/kevlar/http://www2.dupont.com/Personal_Protection/en_GB/assets/PDF/Kevlar%C2%AE Technical Guide.pdfhttp://www.madehow.com/Volume-1/Bulletproof-Vest.htmlhttp://textilesupdate.com/french-machinery-at-techtextil-frankfurthttp://www.youtube.com/watch?v=eRabvfq8TdAhttp://www.youtube.com/watch?v=S_jXAddQDnMhttp://www.youtube.com/watch?v=6vSaw1esxLYhttp://www.youtube.com/watch?v=CDfehw6LIR0

  • End

    24

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