Experiment Name: Determination of yarn count by wrap reel and digital balance.
Objective:
i) To Determine the yarn count by wrap reel and digital balance, from given sample.
II) To learn about basic operations of wrap reel machine.
Theory:
The count is a numerical expression
which defines its fineness or coarseness. It also expresses weather the
object is thick or thin. A definition is given by the textile institute –
“Count is a number which indicates the mass per unit length or the
length per unit mass of any object.”
Types of yarn count:
a) Indirect system- English, Metric, Worsted.
b) Direct system- Tex, Denier, Lbs/Spindle.
Indirect count: The count of yarn
expresses the number of length units in one weight unit. Thus higher the
count, finer the yarn. The system is generally used for cotton,
worsted, linen (wet spun) etc.
Direct count: The count of yarn
expresses the no. of weight units in one length unit. Thus higher the
count, coarser the yarn. The system is generally used for synthetic
fibre, jute, silk etc.
Equation Required:
Ne = L X w / l X W
Where,
W = The weight of the sample.
w = The unit weight of the system.
L = The length of the sample.
l = The unit length of the sample.
Data Table:
No of Observation
|
Length Of Sample
In Yds
|
Weight Of Sample in lb
|
Sample count
|
Average Count
|
01
|
120
|
5.11 X 10-3
|
27.956
| |
02
|
120
|
5.11 X 10-3
|
27.956
|
28.029
|
03
|
120
|
5.07 X 10-3
|
28.177
|
Result : The average testing result for given sample is about 28.029Ne.
Conclusion:
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