Tear index of paper was irregularly changed with increasing grammage (p<0.05). High tear strength means less vulnerable by contact with sharp edges, uneven weight distribution etc. Learn about tear strength testing and the material testing solutions we provide for tear strength testing. Tearing Resistance: Tearing resistance/ strengths is the ability of the paper to withstand any tearing force when it is subjected to. Learn about tear resistance testing and the material testing solutions we provide for tear resistance testing. Because different paper and board grades are subjected to different stresses and strains, several different strength tests have been developed. Its unit is Newton, “N” for short. Tear strength is used to evaluate the ability of fabric resistant to tear along the breach or damaged position in the process of use. Generally, tear strength determines the durability of dyeing and finishing products. You can test the strength by simply trying to tear the top edge of the paper carrier bag. A part of fabric edge is applied a centered load, to make each inner yarn undertake maximum load to burst, and at last a crack comes. The explanation is straight forward; longer fibers tend to distribute the stress over a more fibers and more bonds, while short fibers allow the stress to be concentrated in a smaller area. The most common are tensile, burst, stiffness, tear, internal bond, and ring crush. Low tear strength means that it is easy to tear the paper apart. This module will discuss common strength tests for paper and board grades, as well as sheet parameters that affect strength properties. Concept of Tearing Strength. Local yarns in fabrics tear in residual rent due to concentrated loads, which is called tearing phenomenon of fabrics. For example, when the fabrics are caught by objects, local yarns will be forced to tear in rent; or the parts of the fabrics are held and torn in half. Tear strength is a term used to express how vulnerable is the paper of the bag. 5.2 Tear strength may be influenced to a large degree by stress-induced anisotropy (mechanical fibering), stress distri-bution, strain rate, and test piece size. The fact that longer fibers improve tear strength is well recognized. High tear strength means the opposite. The results obtained in a tear strength test can only be regarded as a measure under the conditions of that particular test and may not have any direct relation to service performance.
Tearing strength definition is - the property of paper or fabric that is measured by the force required to tear it.
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