FABRIC TEARING STRENGTH TESTING:
The tearing of the tearing strength of the fabric is performed in the following steps:
1 - Falling pendulum ( Elmendorf) type fabric tearing strength tester.
2 - Scissor
3 - fabric.
4 - Marking pen
5 - Magnifying glass
6 - Needle
7 - Measuring scale
1 - First of all, the pendulum is set at its starting position. The pointer ( force recording mechanism) is set to zero position.
2 - The specimens of the warp set are tested.
3 - The long sides of the specimen are placed in the centre of the gripping clamps.
4 - The centre position of the specimen in the clamps is fixed with the help of the centre mark made in the specimen.
5 - This centre mark is kept in the bottom direction of the clamps.
6 - The bottom side is placed in the clamps in such a way that it touches the specimen stopper precisely.
7 - The top edge of the specimen is kept parallel to the edges of the clamps.
8 - Now, a cut ( slit ) of 20 mm is made in the test specimen with the help of pressing the handle of the slitting knife inbuilt in the instrument.
9 - We are ready to press the release lever. This release lever is pressed manually.
10 - The pendulum falls rapidly and tears the cloth when the release lever is pressed.
11 - The reading is recorded on the notepad.
• The specimen should be prepared precisely.
• The clamps should be tightened properly.
• There should be no slippage in clamps during the tearing of specimens.
• The pointer should be at zero position.
FABRIC TEARING STRENGTH CALCULATION:
The calculation of tearing strength is given in below picture:
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