New bullet-proof vests not only should protect vital parts of one’s anatomy, but also begin to improve comfort. Application and development of shear thickening fluid and highperformance fiber in the field of soft resistant body armor gets better results. Under high speed impact, the main energy absorption way of composites is yarn distortion, breaking and pulled out. So the fabric structure has a great influence on performance of composites. While interweave resistance means the friction between warp/weft yarn on the fabric organization points. It can evaluate the shear deformation of the fabric and show the bullet-proof performance of composites. This paper uses Kevlar fiber as raw materials with different arguments of polypropylene to make STF-Kevlar composites, discusses how different fabric specifications would affect the performance of composites.

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Interweave resistance of Kevlar Polypropylene fabric and bulletproof performance of STF-Kevlar composites
CONFERENCE PAPER · NOVEMBER 2014
DOI: 10.13140/RG.2.1.3939.5044
6 AUTHORS, INCLUDING:
Hafeezullah Memon
Zhejiang Sci-Tech University
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Available from: Hafeezullah Memon
Retrieved on: 28 August 2015

2. Interweave resistance of Kevlar/ Polypropylene fabric
and bulletproof performance of STF-Kevlar composites
ZHU Chengyan, WENG Puying, SUN Xichao, LI Yanqing, KANG Lingfeng, MEMON Hafeezullah
Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China
New bullet-proof vests not only should protect
vital parts of one’s anatomy, but also begin to improve comfort.
Application and development of shear thickening fluid and high-
performance fiber in the field of soft resistant body armor gets
better results. Under high speed impact, the main energy-
absorption way of composites is yarn distortion, breaking and
pulled out. So the fabric structure has a great influence on
performance of composites. While interweave resistance means
the friction between warp/weft yarn on the fabric organization
points. It can evaluate the shear deformation of the fabric and
show the bullet-proof performance of composites. This paper
uses Kevlar fiber as raw materials with different arguments of
polypropylene to make STF-Kevlar composites, discusses how
different fabric specifications would affect the performance of
composites.
1. Wang, B. Light and Textile Industry and Technology. 2010, 39(4): 22-24.
2. Gu, Z W. J. Textile Research. 2006, 27(08): 80-84.
3. Decker M J, et al. Composites Science and Technology. 2007, 67(3-4): 565-578.
4. Xu, S P.; Zheng, W.; Zang, Y F. J. Tianjin Polytechnic University.2012, 31(3): 15-19.
5. Sun, X C.; Li, Y Q.; Zhan, X F.; et al. J. Textile Research. 2014, 35(08): 5-9.
6. Sun, X C.; Li, Y Q.; Wu, Z.; et al. J. ZSTU. 2014, 31(02): 127-131.
7. Chen, H L.; Yao, M. J. Textile Research. 1992, 13(09): 13-14.
8. Kirkwood K M.; Kirkwood J E.; Lee Y S. J. Textile Research. 2003, 14(16): 21-36.
With the linear density of polypropylene increasing and to
strengthen the combination between yarns, interweave
resistance is better and bulletproof properties of composites
become optimal. With the increase in number of polypropylene
and the combination area expanded, interweave resistance
increases linearly, and bulletproof performance is better. As the
fabric of polypropylene spacing decreases, more energy is
absorbed by the composites.
This work was financially supported by the Program for Zhejiang Leading Team of Science and Technology Innovation(No.2011R50003) and Key
Laboratory of Research of Industrial Textile Materials on the Manufacturing Technology of Zhejiang Province.
Zhejiang Sci-Tech University
Asia-Africa Science Platform Program on
Neo-fiber Technology
Seminar Series 9
INTRODUCTION RESULTS AND DISCUSSION
EXPERIMENTAL SECTION
CONCLUSION REFERENCES
ACKNOWLEDGMENTS
Firstly, the paper bases on the parame-
ters to make 14 kinds of plain weave fabrics,
the parameters as shows in figure 1.
Then, do hot-press by flat vulcanizing
machine to melt the polypropylene.
The third step, prepare STF which so-
lid content is 30% by PEG-200 as dispers-
ing media and SiO2-20nm as nanoparticles.
And then make STF-Kevlar fabric compo-
sites. It has five layers of fabric connected
by TPU.
Fig.1 Adding polypropylene fiber
parameters
单根纱线
开剪标记线
拔脱运动方向
丙纶和芳纶混合
测 时 仪 2发 射 装 置
子 弹 枪 管
测 时 仪 1
试 样 缓 冲 设 备
Specimen preparation
The study tests the interweave resistance by using the
universal material experiment machine.
The study tests the bulletproof performance of STF-Kevlar
composites with the help of the pneumatic high-speed
launcher.
Test
Fig.2 The schematic
diagram of interweave
resistance
Fig.3 The pneumatic high-speed launcher
0 20 40 60 80 100 120 140
0
5
10
15
20
25
交织阻力/MPa
丙 纶 线 密 度 /tex
0 1 2 3 4 5 6
0
5
10
15
20
25
30
35
交织阻力/MPa
丙 纶 根 数 / 根
Fig.4 shows that polypropylene line density increases, the
interweave resistance of the fabric will increase. When the linear
density reaching to a certain value, interweave resistance increases
slowly. Interweave resistance of the Kevlar fabric is 1.19MPa. Once
adding the polypropylene to the fabric, its interweave resistance
increase to 7.69 MPa. Because polypropylene melt at high
temperature, it can work as adhesive in the fabric, strengthen the
combination between the yarn, effectively prevent movement
between the yarn and make the fabric weaving resistance improved
significantly.
Fig.4 The relationship between
interweave resistance and the
linear density of polypropylene
When the number of
Polypropylene increases,
the area of yarn bonding
widens within a certain
distance. Adding polyp-
ropylene to fabrics has a
significant effect to
strengthen the interweave
resistance.
Fig.5 The relationship between
interweave resistance and the
number of polypropylene
20 40 60 80 100 120 140
83
84
85
86
87
88
Im
/(J·m
2
·kg
-1
)
丙 纶 线 密 度 /tex
2 3 4 5 6
80
82
84
86
88
90
92
94
Im
/(J·m
2
·Kg
-1
)
丙 纶 根 数 / 根
4 6 8 10 12 14 16
78
80
82
84
86
88
90
92
94
96
Im
/(J·m
2
·Kg
-1
)
丙 纶 间 距 / c m
Fig.6 The relationship between
energy absorption capability of
composites and the linear density
of polypropylene
Fig.7 The relationship between
energy absorption capability of
composites and the number of
polypropylene
Fig.8 The relationship between
energy absorption capability of
composites and the spacing of
polypropylene
Based on the fitted curve in Figure 6, the greater is the
polypropylene line density, the more is the energy absorption
capability of composites in per unit area. It means that the bullet-
proof performance of composites is stronger.
Ramping up the number of polypropylene, interweave resistance
increase, and the bullet-proof performance of composites is better.
But when the number reaches to a value, performance improvement
effect of composites is weaker.
As shown, the spacing of polypropylene closes up, the energy
absorption capability of composites is strengthened. This is due to
the melting polypropylene, it effectively prevent fiber distortion and
be pulled out, and to strengthen the bullet-proof performance of
composites.