The "fold endurance" of a paper strip is a measure of the resistance of the paper strip to external pressure in the form of multiple repeated folds before breaking. This test determines whether a paper type is suitable for use when repeatedly folded, bent, and creased. Therefore, the test is suitable for papers subjected to such forces or frequently handled, such as currency paper, wrapping paper, maps, brochures, cartons, cover paper, bond paper, ledgers, etc.
Currency paper has a high folding endurance. Factors affecting this property of paper include fiber length, fiber strength, moisture content, use of fillers, etc.
To study the aging properties of the paper, the folding endurance values before and after accelerated environmental aging were used. Quantitatively, it is measured as the number of double folds associated with a specific load that a strip of paper of a specific size can withstand before breaking. There are four different instrument types or designs that can be used to perform this test, and they produce test results that vary with the applied strip load, strip fold angle, and fold speed. Tests using different instruments are performed according to different standards , for example, a Schopper-type Tester is performed according to TAPPI T423, and an MIT-type Tester is performed according to TAPPI T511. Associated with a specific load that a strip of paper of a specific size can withstand before breaking.
There are four different instrument types or designs that can be used to perform this test, and they produce test results that vary with the applied strip load, strip fold angle, and fold speed. Tests using different instruments are performed according to different standards, for example, a Schopper-type Tester is performed according to TAPPI T423, and an MIT-type Tester is performed according to TAPPI T511. Associated with a specific load that a strip of paper of a specific size can withstand before breaking. There are four different instrument types or designs that can be used to perform this test, and they produce test results that vary with the applied strip load, strip fold angle, and fold speed. Tests using different instruments are performed according to different standards, for example, a Schopper-type Tester is performed according to TAPPI T423, and an MIT-type Tester is performed according to TAPPI T511. Bar folding angle, folding speed. Tests using different instruments are performed according to different standards, for example, a Schopper-type Tester is performed according to TAPPI T423, and an MIT-type Tester is performed according to TAPPI T511. Bar folding angle, folding speed. Tests using different instruments are performed according to different standards, for example, a Schopper-type Tester is performed according to TAPPI T423, and an MIT-type Tester is performed according to TAPPI T511.
