Determination of Bending Length of the woven fabric.

Abstract:

In this experiment the bending length of the cotton woven fabric has been determined. The bending length is very important factor which determines the flexibility of the fabric. The bending length in both the warp and weft direction of the fabric is important in calculating the flexibility of the fabric. The warp and weft-wise bending length hence determined in this experiment and results has been discussed.

Determination of tear strength of fabric.

In this experiment the tear strength of the 100% cotton grey fabric was determined by using Falling Pendulum (Elmendorf's) Apparatus. Slit is centrally precut in a test specimen held between two clamps and the specimen is torn through a fixed distance. The resistance to tearing is in part factored into the scale reading of the instrument and is computed from this reading and the pendulum capacity.

Determination of tensile strength of cotton grey fabric by strip method.

Abstract:

In this experiment the tensile strength of cotton grey fabric was calculated having a plain weave design. The experiment was performed according to the ASTM test method D5035. The tensile strength of fabric from both warp-wise and weft-wise direction was calculated. It was noted that warp-wise strength of fabric is more than that of weft-wise tensile strength.

Compare the tensile strength of Ring spun and Rotor spun yarns having same count (20s).

Abstract:

In this experiment different properties of ring and rotor spun yarns were compared. The properties studied are breaking work, breaking force, tenacity and elongation of ring and rotor yarns. The yarns used for this experiment both have 10s count. The results showed that the ring spun yarns have good properties then the rotor spun yarns.

To compare the single yarn strength of given sample of yarns having different twists and same count (20s).

Abstract

The strength of a yarn greatly depend upon its twists per unit inch also called TPI. Yarn is simply a strand of fibers. Fibers are joined together to form a yarn. The binding force between the fibers is the twist given to the yarn at the time of spinning. The twist gave the fibers a binding force to make a yarn. This twist is very important for the yarn because it determines many characteristic properties of the yarn like air permeability, moisture absorption, feeling, dye ability and strength.

This experiment is conducted to check the strength of yarn at different twists levels. The yarn twist has an optimum value by-passing which the strength of yarn starts decreasing. This is called the optimum twist. Yarn length also start deceasing by over-twisting.

To determine the tenacity of single cotton yarn (20s) and determine its %age elongation.

Abstract:

The tensile testing of single yarns is very important in the textile industry, as yarn coming from the spinning process has to pass through a large amount of loading, unloading, tension and tensionless mechanisms until the final product is made. Hence a yarn with good tensile strength or tenacity can bear all the forces during the textile manufacturing process and our final product will be of good quality.
In this experiment, using USTER TENSORAPID machine the tensile strength or tenacity of the yarn is calculated along its %age elongation. This machine acts on the constant rate of elongation (CRE) principle according to the ASTM committee 1997a. The average tenacity values of a 20s yarn are about 18-20 cN/tex. The tenacity of a yarn depends on two things:

USTER TENSORAPID machine - Calculations for Tenacity and Elongation of Single Yarn

Testing Instruments for Tensile Properties of Fibers and Fabric

Methods of Tensile Testing of Textiles

I.    Constant Rate of Elongation (CRE)

Constant rate of elongation tests are tests used to determine the strength of textile materials. In constant rate of elongation tests, the specimen is extended at a constant rate and the force is a dependent quantity.
It is possible in constant rate of elongation tests for load to decrease while elongation increases.

II.    Constant Rate of Loading (CRL)

Constant rate of loading tests are tests used to determine the strength of textile materials. In constant rate of loading (CRL) tests, the specimen is loaded at a constant rate and the elongation is a dependent quantity.
It is not possible in constant rate of loading tests for load to decrease. Load must increase all the time.