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1. Fiber Production & Blending
Most of you are at least generally familiar with the source and production of natural fibers.
Therefore, the primary focus of this section is on the production of manufactured fibers.
A discussion is also presented concerning the blending of both manufactured and natural
fibers.
It should be kept in mind that the process for developing each manufactured fiber has beencarefully selected to produce a fiber with specific characteristics important to its use in
fabrications for apparel, home fashion and other textile products .
2. Distinction Between Cellulosic and Non-Cellulosic Fibers
egarding the production of manufactured fibers, a distinction should be made between
cellulosic and non!cellulosic fibers.
"our manufactured fibers, rayon, acetate, triacetate and lyocell, are cellulosic fibers. This
means that one of the components used in their production is natural cellulose.
#ellulose is wood pulp, generally obtained from trees.
All of the remaining manufactured fibers are non!cellulosic, which means they are entirely
chemically!based.
3. Production Chart for Acetate
To illustrate how man!made fibers are produced, below is a chart showing the production
process for acetate fiber.
$eep in mind that most manufactured fibers go through similar processes in their
development. The production steps include%
A chemical process, shown on the left side of the chart, which prepares and combines the
components used.
A spinning process, shown on the right, which produces the fiber.
A twisting process, which twists the fiber into yarn.
The twisted yarn is then packaged and sent to the textile mills to be either woven or knitted
into fabric.
. !"inning Process - #he !"inneret
&efore being formed into fibers, the fiber!producing substance for all manufactured fibers is
in a thick li'uid state.
In the spinning process this li'uid is forced through a spinneret, which resembles a large
shower head.
A spinneret can have from one to literally hundreds of tiny holes. The si(e of the holes varies
according to the si(e and type of the fiber being produced.
)nlike natural fibers, manufactured fibers can be extruded in different thicknesses.
This is called denier. *enier is a term you may have heard, and essentially relates to the
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fineness of the fiber filament.
"or example, a twelve +-!denier monofilament is commonly used in sheer pantyhose, and a
circular double!knit is about /0!denier.
$. Fila%ent Fiber
As the thick li'uid is forced through the spinneret, what comes out on the other side is a
stringy li'uid called filament.This stringy li'uid is similar to airplane glue, which is a li'uid acetate product.
1hen the filament dries or solidifies, it forms what is called a continuous filament fiber.
2trands of continuous filament fibers are then twisted together to form a continuous filament
yarn, which is then woven or knit into fabric.
. !ta"le Fibers and Blending
The long continuous filament fibers can3t be used for blending because they3re too long and
too difficult to handle. Also, natural fibers, such as wool and cotton, with which many
manufactured fibers are blended, are very short.
Therefore, before blending, man!made fibers are first cut into short fibers, called staple fibers.
The staple fibers can more easily be twisted with the shorter natural fibers, or with staple
fibers of another manufactured fiber.
2taple fibers are created by extruding many continuous filaments of specific denier from the
spinneret and collecting them in a large bundle called a 4tow4.
A tow may contain over a million continuous filaments.
The tow bundle is then crimped, in much the same way a curling iron is used to crimp a
woman3s hair, and is then mechanically cut into staple fibers, usually ranging in length from
to 5!6- inches, depending how they are to be used.
'. Pur"oses of Blending
&lending of different fibers is done to enhance the performance and improve the aesthetic
'ualities of fabric.
"ibers are selected and blended in certain proportions so the fabric will retain the best
characteristics of each fiber.
&lending can be done with either natural or manufactured fibers, but is usually done usingvarious combinations of manufactured fibers or manufactured and natural fibers.
"or example, polyester is the most blended manufactured fiber.
7olyester fiber is strong, resists shrinkage, stretching and wrinkles, is abrasion resistent and is
easily washable.
&lends of 80 to 589 polyester with cotton provides a minimum care fabric used in a variety
of shirts, slacks, dresses, blouses, sportswear and many home fashion items A 80680
polyester6acrylic blend is used for slacks, sportswear and dresses.
And, blends of polyester +/8 to 889 and worsted wool creates a fabric which retains the
beautiful drape and feel of 009 wool, while the polyester adds durability and resistance to
wrinkles.