Working Process of Martindale Abrasion cum Pilling Tester

Working Process of Martindale Abrasion cum Pilling Tester
Md. Abu Shaied Peash
Dept. of Textile Engineering
Primeasia University
Dhaka, Bangladesh
Email: peashwork9@gmail.com



Introduction:
Martindale Abrasion cum Pilling Tester is used to check the abrasion as well as pilling resistance of the fabric. It consists of four testing plates on which the abrading fabrics is attached, these four testing table are mounted on the base plate of the instrument. There is revolving plate, which revolves with the help of three cranks, pegs & motor. There are four sleeves attached on the revolving plate. The sample holders for abrasion & pilling testing are provided with the instrument. There is a set of weights for proper pressure on the test specimens. Templates for cutting the samples & abrading cloth and their mallet are also supplied as standard accessory.
Martindale Abrasion cum Pilling Tester
Martindale Abrasion cum Pilling Tester
Main parts of the machine :
  1. Holder guide
  2. Motor on/off switch
  3. Weight
  4. Power on/off switch
  5. Traveller top plate
  6. Power indicator
  7. Form
  8. Electronic counter
  9. Fabric Disc
  10. Fabric cover lock
  11. Tightening holder
  12. Cranks (3)
  13. Sample holder
Features of Martindale Abrasion cum Pilling Tester:
  • Effective speed ratio of outer pegs to inner pegs
  • 4 specimen can be tested simultaneously.
  • Maximum load (corresponding to pressure of 12KN/m2): 790g
  • Comprise of stainless steel balls.
  • Acrylic Top Plate for safety.
  • The Abrasion of the fabric can be tested through two methods.
Apparatus: (for calculating wear index)
  • GSM cutter
  • Digital balance
  • Martindale pilling & abrasion tester
For Abrasion Test :
Sample size : (40*40) mm2
No. of cycle : 50,000
Rpm : 65±2

                                         Weight loss in mg
Formula : wear index, I = (……………………. X 100)%
                                            No of cycles

Weight lose = (X1-X2)mg

Working Procedure:
  1. At first cut the fabric into 4 pieces according to the measurement of the instrument.
  2. Weigh(X1) these 4 pieces of fabric samples.
  3. Now place these samples in the instrument under a certain load as supplied in the instrument.
  4. Now start the machine and observe the counter of abrasion no.
  5. Stop the machine power after completing 50,000 cycles take the weigth (x2) in mg.
  6. Now put the weights before and after abrasions in a table and find out the wear index (I). 
S/n
Sample wt. (x1) before abrasion (mg)
No. of abrasion cycle
Sample wt.(x2) after abrasion (mg)
Wt. loss
(mg)
Wear index
(I) %

1
870
50,000
590
280
0 . 56
2
……………
……………..
…………………
………..
……………
3
………………
…………………
………………….
………..
………………
4
………………….
………………
………………
…………
………….
Calculation:
Suppose for s/n 1 : we got cycle = 50000, wt. loss = 280gm therefore,

Wear Index (I) = {(weight lose in mg)/no. of cycles }*100
= (280/50000)*100 = 0.56 %

Result:
Wear index for 50000 cycle = 0.56 %

Comments:
It is easily understood that the more is no. of abrasion cycle the more will be the wt. loss of fabric. That is when a fabric is used more it losses its weight more. Now depending on yarn quality, fabric design and above all end use this loss may be less or more, again may be quickly or lately. But indeed the fabrics will loss its weight and serviceability. So, finally we can say that the more wear index value the less durability of the fabric.

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