1、 FORD LABORATORY TEST METHOD BN 119-01 Date Action Revisions Rev 02 2013 06 25 Revised Technical changes see summary of revisions D. Murtonen FNA 2001 09 24 Revised Editorial no technical change A. Cockman 1995 10 04 Controlled document at www.MATS Copyright 2013, Ford Global Technologies, Inc. Page
2、 1 of 3 DETERMINATION OF SEAM STRENGTH OF TEXTILE TRIM MATERIALS Application This test method is used to determine the seam strength of sewn automotive seating fabrics and vinyl coated fabrics. Apparatus and Materials Required Sewing Machine Capable of producing a lock stitched seam as described und
3、er Procedure, Para. 2. Needle Size 19/120 with Needle Point being Ball/Round-unless otherwise specified in the Engineering Material Specification Thread Tex 90 or Metric 30, WSS-M15H51-B2 for top and bottom, unless otherwise specified in the Engineering Material Specification. Tensile Testing Machin
4、e With a set of grab-clamps (clamping - jaw surface area shall be 25 mm x 25 mm). It must have a constant rate of jaw separation of 300 mm/minute and be equipped with a load recording device. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a con
5、trolled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. Cut 10 warp or wales specimens each 100 x 150 mm in size with the longer dimension parallel to the weft or courses d
6、irection, and 10 weft or courses specimens with the longer dimension parallel to the warp or wales direction. 2. Sew 5 pairs of warp or wales specimens and 5 pairs of weft or courses specimens with the sewn seams parallel to the longer dimension (as shown in drawing). Tie the loose ends of the stitc
7、hing threads at either end. The ends of the stitching threads may also be secured by sewing an adjacent piece of fabric or sealing the thread ends with adhesive. FORD LABORATORY TEST METHOD BN 119-01 Copyright 2013, Ford Global Technologies, Inc. Page 2 of 3 Sewn-Seam Construction The stitch shall b
8、e a simple lock stitch with a stitch length of 5-6 stiches per inch or 5.0-4.2 stitches per mm and shall run 8 mm (+/- 2) from the cut edges of the test specimen. 3. Insert and secure a prepared test assembly in the clamps of the tensile machine, as shown in drawing, with the seam centers between th
9、e clamps. The distance between the clamps at the start of the test shall be 75 +/- 1 mm. 4. Apply the load at a rate of 300 mm/minute and record the maximum load of each specimen in Newtons at time of break and note the type of failure occurring - material break, sewing thread break or material yarn
10、 slippage. Evaluation Report the average of the 5 results in Newtons in each direction from step 4. Note: If, as a result of sewing thread break the minimum tensile strength required by the relevant material specification is not met, the test must be repeated taking newly prepared test assemblies. C
11、hemicals, 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. Summary of Revisions 2013 06 25 Removed recommended suppliers for sewing machines and needles Updated needle size and point Updated stitches per inch/mm Updated seam allowance FORD LABORATORY TEST METHOD BN 119-01 Copyright 2013, Ford Global Technologies, Inc. Page 3 of 3 DETERMINATION OF SEAM STRENGTH OF TEXTILE TRIM MATERIALS WEFT/COURSES TEST SPECIMEN WARP/WALES TEST SPECIMEN
