Applications:
The seam fatigue tester is designed to evaluate the fatigue resistance of seam on the material which is applied on the surface of automotive seat. The surface material of car seat (leather, synthetic leather, fabric, etc.) is often stitched together. The stitching strength of the material seam and the fatigue strength of the seam can directly affect the service life of the seat. The strength and life of the joint of the test material can effectively predict the life of the seat and provide the direction of improving the service life.
Seam Fatigue Tester Testing Method:
The operator installs the set up gage between one pair of sample clamps on a station. The sewn test sample is aligned and clamped into position.The set up gage is removed and installed on the second station. The second sample is aligned and clamped into position and the set up gage is removed. The desired number of test cycles is entered on the cycle counter and the test is started. Once this cycle count is reached the machine will automatically stop. Test samples are visually evaluated.
How it works:
The Dynamic Seam Fatigue tester plunges a rubber-faced wheel 7,000 times onto a standard 7-SPI (stitch per inch) upholstery seam. Specimens are sewn in the warp to warp, filling to filling, and warp to filling direction. If after 7,000 cycles, the seams demonstrate no failure, the fabric is determined to have passed the criteria established by ASTM (American Society of Testing and Materials) and BIFMA (Business and Institutional Furniture Manufacturers Association). ASTM D4033-92 is used, modified by Seating Durability Test as the standard test method.
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