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Folding endurance

Folding endurance Folding endurance or folding strength is the ability of a strip of paper to resist breaking when folded under a certain load. This load is constant but is generally only a small fraction of the tensile strength of the paper. The folding strength is expressed directly as the number of double folds that

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Z-directional strength of paper

Z-directional strength of paper Z-directional strength refers to the ability of a paper or board to resist tensile loading in a direction perpendicular to the plane of the paper (Z-direction). After exceeding the Z- directional strength of the paper, a break in the paper structure occurs in the sheet but not at its surface. The

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Bursting strength

Bursting strength Bursting strength is the maximum pressure that the test sample can resist without breaking with pressure applied perpendicular to the plane of the test piece. The unit for bursting strength is kilopascal, kPa. Calculation of the material-related burst index uses the following formula: (1) Burst index expression uses kPa.m2/g. The bursting test for

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Tensile strength

Tensile strength Tensile strength is a very useful property to describe the general strength of any material. For paper, it is the maximum force per unit width that a paper strip can resist before breaking when applying the load in a direction parallel to the length of the strip. Measurement uses testers applying a constant

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Why test pulp and paper?

Why test pulp and paper products? Testing raw materials, end products, and intermediates of a manufacturing process is a common feature of all industrial processes. In one form or another, testing has been performed as long as products have been manufactured. Today, testing is a very important part of all industrial activities. As industrial processes

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Material testing and product properties

  Editor: M. Sc. (Tech) Petteri Maijanen, ABB Material testing and product properties     Understanding the desired product properties and managing the testing methods to monitor them are key factors to improve the quality of the end product in pulp-, paper- and boardmaking. Also, with proper material testing, the end customer can determine the

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