2. Prepared By : Mazadul Hasan sheshir
ID: 2010000400008
13th Batch (session 2009-2013)
Department : Wet Processing Technology
Email: mazadulhasan@yahoo.com
Blog : www. Textilelab.blogspot.com (visit)
Southeast University
Department Of Textile Engineering
I/A 251,252 Tejgaon Dhaka Bangladesh
Prepared By :
4. BICOMPONENT FIBERS
The first commercial bicomponent application in the mid 1960s
Bicomponent fibers can be defined as "extruding two
polymers from the same spinneret, that is, both
polymers contained within the same filament.” The
term "conjugate fibers" is often used, particularly in
Asia, as synonymous with bicomponent fibers.
Bicomponent fibers are commonly classified by their
5. Definition:
Bicomponent fiber is comprised of two polymers of
different chemical and / or physical properties extruded
from the same spinneret with both polymers within the
same filament.
6. fiber cross-section structures as:
1.Side-by-Side,
2.Sheath and Core
3.Islands-in-the-Sea and
4.Segmented-pie cross-section types
5.Tipped
6.Mixed Fiber
7.Micro Fiber
7.
8. Advantages of Bicomponent Thermal Binder Fibers
•Uniform distribution of adhesive
•Fiber remains a part of structure and adds integrity
•Customized sheath materials to bond various materials
•Wide range of bonding temperatures
•Cleaner, environmentally friendly (no effluent)
•Recyclable
•Lamination / molding / densification of composites.
9. Common Polymer Combinations in Bicomponent Thermal Binder
Fibers
1. Polyester Core (250C melt point) with Copolyester Sheath (melt
points of 110C to 220C)
2. Polyester Core (250C melt point) with Polyethylene Sheath
(130C melt point)
3. Polypropylene Core (175C melt point) with Polyethylene Sheath
(130C melt point)
10. Bicomponent Fiber Capabilities
Bicomponents can provide:
1. Thermal bonding
2. Self bulking
3. Very fine fibers
4. Unique cross sections
5. The functionality of special polymers or additives at
reduced cost
11. POLYMERS
The polymers given below can be used as either of the components in the cross
sections
PET (polyester) PEN polyester
Nylon 6,6 PCT polyester
Polypropylene PBT polyester
Nylon 6 co-polyamides
Polylactic acid polystyrene
Acetal polyurethane
Soluble co polyester HDPE, LLDPE
12. Worldwide, Japan and Korea led in bicomponent output with a total of 200 million
pounds annually. The production of the U.S. is currently around 60 million pounds
with Hoechst Celanese holding the lead. Other U.S. players in the Bicomponent
sector include Foss manufacturing, International Polymers Inc. and Fiber Visions.
The present production of bicomponent fibers worldwide is only a fraction of the
25 million metric tons of manmade fiber market, but the producers are confident
of significant growth in the next 10 years or so .
PRODUCERS
13. These fibers contain two
components lying side-by-
side. Generally, these fibers
consist of two components
divided along the length into
two or more distinct regions.
Sheath-core Bicomponent
fibers are those fibers where
one of the componentsis fully
surrounded by the second
component.
These fibers are widely used
as bonding fibers in
Nonwoven industry.
18. MATRIX-FIBRIL BICOMPONENT FIBERS
These are also called islands-in-the-sea fibers. Technically these are
complicated structures to make and use. In cross section, they are
areas of one polymer in a matrix of a second polymer. These types of
bicomponent structure facilitate the generation of micro denier fibers.
The ‘islands' are usually a melt spinnable polymer such as
nylon, polyester or polypropylene. Polystyrene water-soluble polyesters
and plasticized or saponified polyvinyl alcohol can form the sea or
matrix. The finer deniers that can be obtained are normally below 0.1
denier
