Yarn is a linear assembly of fibers or filaments twisted together to impart strength or laid together to form a continuous strand suitable for fabric manufacturing. There are two types of yarn: staple yarn and filament yarn. Staple yarn is made of shorter fibers or filaments held together by twisting, while filament yarn consists of continuous filaments running the yarn's full length that are either twisted or untwisted. Yarn can be further classified based on fiber length, number of plies, twisting direction, and spinning method.

1. What Is Yarn ?
By
Engr Hassan Ahmad
Textile Engineer - NTU

2. Definition :-
Yarn is a collective term of linear
assembles of fibers or filaments
that are twisted together to impart
strength or they can laid together
to form a continuous strand that
is suitable to manufacture fabric.
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3. Types of Yarn - Major
Yarn can be classified into two categories:
1) Staple yarn
2) Filament yarn

4. Staple Yarn
A staple-spun yarn is a linear
assembly of fibers.

5. Staple Yarn
Fibers are held together by the insertion of twist, to form a
continuous strand that is smaller in cross-section with specified
length.

6. Staple Yarn
Staple yarns divide into different categories based on their
length, no. of ply, twist direction, spinning method etc.

7. Staple Yarn Types
Staple-spun yarn can be classified into two
categories :
1) Short staple yarn:
2) Long staple yarn:

8. Short Staple Yarn
A short staple fiber has a length of between 10 and
60mm.
For Example :- cotton fiber is a short staple at about
25–45mm.

9. Long Staple Yarn
A long staple fiber has a length more than 60mm.
For Example :- wool fiber is a long staple at about
60–150mm.

10. Filament Yarn
Filament yarn is a collective form of twisted or without twisted
strands of filaments, each of the filaments runs the complete
length of yarn.
Filament yarn can be natural, non-synthetic, and synthetic.

11. Filament Yarn Types
Filament yarn can be classified into two categories :
1) Monofilament yarn:
2) Multifilament yarn:

12. Monofilament Yarn
Mono filament yarn is a single strand of filament
form yarn.
Thicker mono filaments are generally used for
industrial purposes rather than fabric production.

13. Monofilament Yarn
Monofilament yarns are mostly used for
manufacturing sewing threads, metallic yarns, bare
elastic or fishing lines

14. Multifilament Yarn
Multi filament yarns are composed of two or more
filament strands twisted, plied or yarns twisted
together to form one yarn.
50-100 filaments may be present in the
multifilament.