Sample preparation
To ensure consistent fabric properties day after day, all test specimens are first conditioned to approximately 70 degrees Fahrenheit and 65% relative humidity. Once the fabrics are adequately conditioned, test specimens are cut to 8 inches by 4 inches. To ensure the results are representative of the fabric in question, five individual specimens are cut from different locations on a roll of fabric. Next, the specimens are folded in half, resulting in a 4-inch-square folded test specimen. For consistency in testing fabrics that have a different face and back, samples are always folded so the technical face of the fabric is on the outside.
Test procedure
When a specimen has been prepared, it is placed on the orifice platform and is ready for testing. At this point, the plunger is activated and begins pushing the sample down through the orifice. Once the plunger has forced the fabric through the specimen, the maximum force required to do so is displayed on the force-measurement gauge. In the case of modern digital models, this force can be measured to the nearest 0.001 pounds. Once the force is recorded, the gauge is reset and these steps are repeated until all five specimens are tested. These five results are then averaged and reported as fabric stiffness.
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