Count in different system
There are many types of count which are classified under direct and indirect system. Various types of count in direct and indirect system are as following:
Showing posts with label Yarn. Show all posts
Showing posts with label Yarn. Show all posts
23 December 2011
22 December 2011
Yarn count| Types of counting system
Yarn count is a term used to express the thickness of yarn. In spinning process, there is a relation between the weight of the original fibres and the length of yarn. This relation is indicated as thickness. Thickness of yarn is determined by the extent of drawing process (varying draft) and designated by number. The number is called count.
14 September 2011
Function of Twist in yarn structure | Why twist is important for yarn
A question may arise why twist is given to yarn or what is the
function of twist. Actually twist plays a vital role in yarn manufacturing which
is given below -
1. The main function of twist is
to give a round shape to the yarns, increase the strength of yarn. As in sliver
no twist is given, therefore it is easy to open the fibre, but it is difficult
in case of roving or yarn.
2. Without twist a strand of
fibres has very little strength and in the first instance a yarn must have
sufficient tensile strength to withstand the stresses of preparation and fabric
manufacture.
3. The main function of twist is
to give coherence to the yarn. In order to develop strength in a twisted strand
of discontinuous fibres and so resist breakage, the individual fibres must grip
each other when the strand is stressed. This cohesion arises mainly from the
twist, which presses the fibres together as the stretching force is applied and
so developing friction between adjacent fibres.
4. If the twist is low, the
fibres can be made to slide past one another, but if it is large they cannot.
The twist can be termed as twist angle that means when twist angle is high,
then yarn strength is high. An experiment shows that, when twist is increased
then yarn strength increases within a certain limit and at a point called
critical point the maximum strength of yarn is obtained. But after critical point
at the end increasing the tension goes to the rupture the strand by breaking
the component fibres.
Continue reading.....
12 September 2011
Amount of Twist | Importance of Twist
Amount of twist
The
amount of twist means the number of turns in unit length in a twisted yarn.
If “n” be the number of turns in “L” length of yarn, then amount of twist will
be n/L. Amount of twist is expressed in -
a. Twist per inch (TPI)
b.
Twist per meter (TPM)
c.
Twist per centemeter (T.P.C.m)
08 September 2011
Yarn Twist | Twist direction
Yarn Twist
According to Morton, “When a strand is twisted the
component fibres tend to take on a spiral formation, the geometric perfection
of which depends on their original formation.”
According to Skinkle, “Twist is the measure of the
spiral turns given to a yarn in order to held the constituent fibres or threads
or threads together.”
05 September 2011
Yarn designation| Factors required for yarn designation
According
to Textile Institute, “Yarn may be defined as a product of substantial length
and relatively small cross-section consisting of fibre or filament with or
without twist”.
To properly describe a specific yarn for communication purpose, a great deal of information is required. By using these information, the structure and properties of a yarn can be exposed entirely. The factors which are required to express yarn structure and properties wholly are called yarn designation.
26 August 2011
Explanation of different types of yarn
1. Single yarn
Single yarn is the simplest continuous strand of textile mtl composed of one of the following : -
(i) Continuous filament
Filament consists of very long, thin cylinder type fibre twisted together. Continuous filament yarns are the simplest in the structure but can be subjected to many modifying process for changing their texture, extensibility, bulk and other properties. In the manufacture of man made filaments, a solution is forced through very fine holes of spinneret, at which point the solution solidifies by coagulation, evaporation or cooling.
25 August 2011
Types of yarns on the basis of Structure
Another classification of yarn can be obtained on the basis of structure and this classification is easier way to understand and define many types of textile yarns. Here the classification is given below :-
17 August 2011
Yarn | Types of yarn
Yarn
Generally yarn is a continuous strands which is made up of filament, fibres or materials where the materials are suitable for knitting, weaving, otherwise forming a textile fabric.