What is textile seam slip testing and test methods?

Textile Seam slip testing principles

Textile seam slip testing uses two main methods. The first method is the Fixed Length Force Measurement. The second method is the Fixed Force Length Measurement. Both methods use CRE equipment for testing.

In the Fixed Length Force Measurement method, we slowly apply a standard defined force, such as 100 Newton. We then measure the width of the opening at the seam position once we reach this force.

In the Fixed Force Length Measurement method, we gradually pull open the seam opening to a standard defined width, such as 6mm. We then measure the amount of force used to reach this width.

Currently, most Chinese and Japanese garment industries use Fixed Force Length Measurement, and the American standard uses Fixed Length Force Measurement.

Four major standards comparison

  • The slip test methods are miscellaneous in China’s national standard system. There are at least three Fixed Force Length Measurement methods, respectively, GB/T13772.2, GB/T21294, and FZ / T system in the fixed force 100N test method. The most widely used one is the last, the fixed force 100N. The general requirements are at most 6mm for qualified.
  • GB / T 13772, equivalent to ISO 13936, contain Fixed Length Force Measurement and Fixed Force Length Measurement.
  • In the Japanese standard system, Fixed Force Length Measurement, the JIS L 1096B method is commonly used. According to the fabric thickness (150g/m2), 49N and 117.7N fixed force within 3mm is qualified.
  • ASTM D 434 (replaced by ASTM D 1683) is the Fixed Length Force Measurement method, which measures force when the seam opening is 6mm.
  • Regarding test severity, the Japanese standard is the strictest, China’s national standard is the second, and the European standard is the most “loose.” The standard American method is entirely different, and it isn’t easy to compare, but the American standard method of repeatability and data stability should be higher than the first three.
  • In the standards of China, Europe, and Japan, warp slippage refers to the movement of the warp threads over the weft threads. However, by American standards, warp slippage refers to the movement of the weft threads over the warp threads. Please note that “warp” refers to the longitudinal threads in a fabric, and “weft” refers to the threads that run across the width of the fabric. “Slippage” refers to the movement of these threads relative to each other, which can be a significant factor in the performance and durability of a fabric.

The difference between the opening width measurement and calculation of China’s standard (European standard) and the Japanese standard:

GB seam slip
JIS seam slip
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