1、 FORD LABORATORY TEST METHOD BN 106-02 Date Action Revisions Rev. 04 2018 05 22 Revised Specimen prep and Evaluation L. Pollard, NA 2017 08 23 Editorial Title Change D. Murtonen, NA 1995 09 29 Released Controlled document at www.MATS Copyright 2018, Ford Global Technologies, LLC Page 1 of 3 SEAM DET
2、ERIORATION TESTING Application This procedure is used to determine the ability of fabric or polymeric film coated seating textiles to resist needle hole elongation in a sewn seam. Apparatus and Materials Required Sewing Machine Must be capable of producing a lock stitch join seam. Needle Size 19 wit
3、h a ball/round needle point. Thread Tex 90/M30. Nylon (WSS-M8P25-C/latest) for top and bottom thread. Seam Fatigue Tester Model: Seam Fatigue Tester Source: Schap Specialty Machine, Inc. Model ATD-200L Source: DAIEI KAGAKU SEIKI MFG. Co. Ltd. www.daieikagakuseiki.co.jp/en Or any equivalent apparatu
4、s. Calipers Must be capable of measuring internal dimensions within a 0.01 mm accuracy. Chemicals, materials, parts, and equipment referenced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. Conditioning and Test
5、 Conditions All test values are based on material conditioned for not less than 24 h prior to testing in a controlled environment of 23 +/- 2 C and 50 +/- 5% relative humidity. Testing of the material should occur in the conditioning environment or soon after removal. FORD LABORATORY TEST METHOD BN
6、106-02 Copyright 2018, Ford Global Technologies, LLC Page 2 of 3 Specimen Preparation 1. Cut 12 squares, 100 X 100 mm and label machine direction (warp/wales) on each cut square. 2. Assemble 3 pairs with machine direction (WMD) as shown in Figure 1, A-surface facing A-surface to create 3 (WMD) speci
7、mens. These specimens are sewn along the against machine direction edge. 3. Assemble 3 pairs of against machine direction (AMD) as shown in Figure 2, A-surface facing A-surface to create 3 (AMD) specimens. These specimens are sewn along the machine direction edge. 4. Sew the pairs 8 mm from the cut
8、edges with a stitch length of 5-6 stitches per inch (Figure 2). Back stitch for approximately 3 stitches to lock in the thread. With Machine Direction Specimen Against Machine Direction Specimen Figure 1. Alignment of 100 X 100 mm squares for machine direction and against machine direction specimens
9、. Figure 2. Sewn-Seam construction with an 8 mm seam distance and 140 mm distance between the clamps. 140 mm 8 mm Clamping Area WMD AMD AMD AMD WMD AMD WMD WMD FORD LABORATORY TEST METHOD BN 106-02 Copyright 2018, Ford Global Technologies, LLC Page 3 of 3 Test Procedure 1. Clamp specimens in the Sea
10、m Fatigue Tester so that specimen clamps are at a 140 mm distance (Figure 2) while a 3 kg load is applied. 2. Set counter to 2500 cycles and initiate testing. The Seam Fatigue Tester will stop at the end of the test cycle. Evaluation 1. The test specimens are evaluated in the test machine with the l
11、oad applied. Visually assess each specimen to determine the 3 largest holes to measure. Using calipers, measure the maximum length these holes created due to needle hole elongation. The measurement for needle hole elongation is from the edge of the thread to the other side of the elongated hole (Fig
12、ure 3). Any value outside specification limits will be considered a failure. 2. Evaluate the 3 with machine direction specimens and the 3 against machine direction specimens. 3. Report the 3 largest hole measurement values in mm for each of the 6 specimens. Figure 3. The measured holes, created by n
13、eedle hole elongation, are shown by the arrowed brackets. Summary of Revisions 2018 05 22 Revised Specimen preparation and the method for measuring needle hole elongation. 2017 11 01 Editorial Changed title 2013 08 23 Updated needle size and point. Updated stitch length Updated seam allowance width and test specimens per seam allowance. Updated procedure descriptions and Figure 1 Distance to measure
