What is Elmendorf tear test?

Elmendorf Tear testing determines the force required to continue the tearing of an initial cut in sheet materials such as paper, plastic film, textile and non-wovens.

How do you use Elmendorf tear tester?

The operation of the ProTear is easy —simply secure the sample in the clamps, make an initial tear and press test to release the pendulum. The tearing resistance of the material is measured via the transference of the potential energy stored in the raised pendulum to kinetic energy.

How is tear resistance measured?

Tear strength used to characterize the tear resistance is one of the important mechanical parameters of rubber products. It is the value of force needed to rip a material and to make the crack continue until it fails. Therefore, it is calculated by force versus thickness: Tear strength = F/t.

What is tear tester?

Tearing Tester is used to gauge the internal strength of the materials like paper or clothing.

How do you test for tear resistance in paper?

The Elmendorf-type tester is a pendulum that applies the force and measures a loss in the potential energy of the pendulum equating to the work done in tearing the paper. Smithers use an L&W single tear tester for papers and a James Heal Elmatear tester for heavier weight boards.

What is tear strength test?

The tear resistance test on fabrics or tear strength is measured to check how the material can withstand the effects of tearing or cuts when in tension. The tear strength is measured as per the ASTM D412 standard test method, which is also used to measure tensile and elongation.

How do you increase your tear strength?

About Tearing Strength of Fabrics

1. By reducing the thread count in the direction opposite to the direction of test, the tearing strength can be increased.
2. Use yarns with the high breaking load in the direction of test to increase tearing strength.
3. Decrease friction between yarns to increase tearing testing strength.

How is tear test done?

To conduct a Schirmer’s test, a doctor places a piece of filter paper inside the lower eyelid of both eyes and the person closes their eyes. After 5 minutes, the doctor removes the filter paper. The doctor then assesses how far the tears have travelled on the paper.

Why is tear strength necessary?

This test measures the force required to rupture a pre-slit woven fabric specimen under specific conditions. Tear strength is important in industrial textiles where heavy duty work is performed. High tear strength ensures that punctures in the fabric don’t propagate easily.

Which parameters are important for good tear strength in paper?

Factor of the tear strength of paper Among of them fiber length and fiber bonding are most important factor. Longer fibers increase the tear strength because it is able to distribute the stress over more fibers and more bonds, whereas short fibers concentrated the stress in a smaller region.

How is the quality of paper tested?

Depending on paper application different testing methods are used to determine its strength, such as breaking strength, tensile strength, breaking length, elongation, tearing strength, folding resistance and stiffness.