The Tensile Strength Test of cotton yarns

The tensile strength values of the dry and wet cotton yarns varies very much from each other. The strength of wet cotton yarns is greater than that of dry cotton yarns. This is due to the formation of hydrogen bonds between the water molecules and the hydroxyl groups in the cellulosic rings of the cotton fibers in the wet state.

Objectives:
To calculate the tensile strength of cotton yarns in both dry and wet state.
 To calculate Count Lea Strength Product of dry cotton yarns.
  To compare the tensile strength of dry and wet cotton yarns.

Materials:
 Dry cotton yarn.
 Water
 Beaker
 Wrapping Reel
 Tensile Strength Testing Machine
 Weighing Balance

Procedure:
Dry cotton yarn was taken.
8 leas of 120 yards of that yarn were made using the wrapping reel.
4 of them were soaked in the water placed in the beaker.
Weight of each of the dry samples were taken on the weighing balance.
These were now placed on the tensile strength testing machine.
 Tensile strength of both dry and wet yarns were calculated.

Calculations:
Length of lea taken = 120 yards
120 yards = 10920 cm
English count = 0.0059 x  (length of cm / weight in grams )
CLSP= Count Lea Strength Product = Count x Tensile Strength
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