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TAPPI T 556 om-21

Bending resistance of paper and paperboard (Lorentzen & Wettre type tester)

This procedure is used to measure the bending resistance of paper and paperboard in the machine and cross machine directions, by determining the bending resistance in mN of a 38 mm (1.5 in.) wide vertically clamped sample, at 15ø or 7.5ø deflection. For this method the standard bending angle is 15 ñ 0.1ø. For specimens that break or are otherwise unsuitable at 15ø a bending angle of 7.5 ñ 0.1ø shall be used.

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