Moisture Regain and Moisture Content Test Linear Density Test Single Yarn Strength Test

1. TEXTILE TESTING
Group Members:
Noor Fatima
Noor ul ain
Omaima Khan

2. Contents:
• Moisture Regain and Moisture Content
• Linear Density
• Single Yarn Strength

3. Moisture Regain and Moisture Content

4. You should keep in mind the following questions, the presentation will
move about them:
• What is the moisture regain and moisture content?
• Is there any difference between both of them?
• Have they any considerable effects on fiber?
• How they can be measured?

5. Moisture Regain and Moisture Content
•The amount of moisture(water) present in
the textile sample is referred to either by
its regain or content.

6. Difference between Moisture Regain and Moisture
Content
Moisture Regain
• As the weight of water expressed in the percentage of the oven
dry weight of the sample.
Moisture Content
• As the weight of the water expressed in the percentage of the
total weight of the sample.

7. Formulae
Moisture Regain= Weight of water × 100
Oven dry weight of sample
Moisture Content= Weight of water × 100
Total weight of the sample

8. Effects of Moisture on Cotton fiber
• Cotton moisture impacts cotton from field to
fabric.
• Cotton color, length and strength; as well as
other properties, are all impacted by cotton
moisture content.
• It is an important attribute in the trade of cotton
due to not only its impact on bale weight but also
the potential impacts on fiber quality and
processing.

9. Measurement of Moisture Regain and Moisture
Content
Equipment required:
• Weighing Machine
• Drying Machine
• Cotton Sample
• Tarred Bottle
• Standard used:
ASTM D2495-07

10. • The results will be shown in the form of
percentage as these are the ratios between
the same quantities multiplied with 100.
• The values for the Moisture Regain are
always greater than those of the Moisture
Content.
Results

12. Procedure

13. LINEAR DENSITY

14. Linear Density
•Linear density of textile yarn is also called Yarn Count.
•Yarn count is the numerical expression which indicates or
expressed the fineness or coarseness of yarn.
•According to Textile Institute, Count is a number indicating
the mass per unit length or the length per unit mass of yarn.

15. Measurement of Linear Density
•Yarn linear density is often measured using
standard test method ASTM D1907.
•For the sake of determination of linear
density, yarn was first transformed into lea
with the help of wrapping reel.
•There are two systems for the measurement
of count:
1. Direct System
2. Indirect System

16. Direct System
•The direct system or fixed length system where the yarn count
is the mass per unit length of yarn.
• In direct count system, the length of yarn is fixed and the mass
of yarn varies according to its fineness.
•Higher the count, coarser the yarn.

17. Direct System
•N = ( l × W) / L
Where, N = yarn count
L = the length of the sample
W = the weight of the sample
l = unit of length of the system
•This system is commonly used for polyester, nylon, silk, acrylic
and jute yarn.

18. Direct System
COUNT SYSTEM NAME UNIT OF LENGTH UNIT OF MASS
Tex 1000 m No. of grams
Denier 9000 m No. of grams
Pounds per Spindle
( Jute, Hemp)
14,400 yards No. of lbs.
DeciTex (dTex) 10,000 m / 10 km No. of grams
miliTex (mTex) 1000 m No. of milligrams
KiloTex (kTex) 1000 m No. of kilograms

19. Indirect System
• The indirect system or fixed weight system where the yarn
count is the length per unit weight of yarn.
• In indirect count system, the mass of yarn is fixed and the
length of yarn varies according to its fineness.
• Higher the count, finer the yarn.

20. Indirect System
• N = (L × w) / ( l × W)
Where, N = yarn count
L = the length of the sample
w = unit of weight of the system
W = the weight of the sample
l = unit of length of the system
•This system is widely used for measuring count of cotton yarns.

21. Indirect System
COUNT SYSTEM NAME UNIT OF LENGTH UNIT OF MASS
English Cotton Count (Ne) 840 yards 1 pound / 1 lb.
Metric Count (Nm) 1000 m / 1 km 1 kg
Worsted Count (Nek) 560 yards 1 lb.
Woollen Count 256 yards 1 lb.

22. Procedure

23. SINGLE YARN STRENGTH

24. Definition of Single Yarn Strength
• This the force required to break a strand of single yarn.
• It is expressed in centi-Newton(cN).

25. Measurement of Single Yarn Strength
Equipment:
• Ustertensorapid
• Auto control
• Uster Printer

26. Standard
• 15.ASTM D2256 test method for breaking load and elongation of yarn
by the single strand method.

27. Procedure