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Paper tear strength; It is defined as the resistance of a sheet of paper to the tearing force. It is an important physical property of paper and cardboard.
Measured in both the machine direction (MD) and the cross direction (CD) and is expressed in mN (milli Newton). Machine direction refers to the direction of the paper web running on the machine during paper making. Cross direction means the direction perpendicular to the paper sheet moving on the machine during paper making.
Tear resistance, inter-fiber bonding, fiber strength, fiber length, depends on the degree of fiber thinning depending on the quality and amount of fillers used. Among these, fiber length and fiber binding are the most important factors.
Tear strength is an important factor for many applications such as cover papers, wrapping, toughness of wrapping papers, writing papers, envelope papers, printers and converters.