1、FORD LABORATORY TEST METHOD BN 025-01 2001 O9 17 SAG TEST FOR VINYL HEADLINING Revised Editorial - no technical change A. Cockman Application This procedure is used to determine dimensional changes occurring as a result of steaming and field environmental conditions such as high humidity and wide te
2、mperature variations which affect the fit of the headlining in the vehicle. Apparatus Required 1. A metal frame with w see attached drawing. od inlay for stapling purposes. F r dimensi na1 and detailed onstruction, 2. Sag depth gage - Starrett #640-431 with special fabricated base. See attached draw
3、ing for details. 3. Steam line capable of producing a temperature of 180 +/- 5 OF, using dry steam. Nozzle opening - 318 by 1/32 inch. 4. Cold box capable of accommodating 18 by 36 inch frames and maintaining temperatures of - 20 +/- 2 OF. 5. Air circulating oven capable of accommodating 18 by 36 in
4、ch frames and maintaining a temperature Of 180 +/- 5 OF. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 OC and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same co
5、nditions unless otherwise specified. Procedure 1. Condition test sample for 24 h at 70 +/- 2 OF and 65 +/- 2 % relative humidity. 2. Place frame top side down on vinyl face of headlining and mark off outside dimensions (long dimension with warp direction). Scribe a guide line for alignment purposes
6、in warp and fill direction, showing the approximate amount of material to be stretched. I Date I Action I Revisions I Copynght02001, Ford Global Technologies, Inc FORD LABORATORY TEST METHOD BN 025-01 3. Align sample on frame, vinyl face up and staple two sides to frame (warp and fill) in a uniform
7、manner. (For perforated headlining, mask off with 1 inch wide tape in area to be stapled.) Stretch the opposite sides until the initial sag reaches .O10 to .O30 inch. Using the guide lines, staple the material evenly without wrinkles. 4. Measure initial sag as follows: Place depth gage across the ce
8、nter of the frame, using the edges of the frame for support, and lower the measuring foot until it contacts the headlining with only slight pressure. If initial sag is too great or too low, remove staples and restretch headlining until specified initial sag values are attained. After initial sag is
9、measured, mark off the position of the depth gage on the sides of the material. 5. Frame should be placed flat on the table, vinyl side down, to allow for uniform steam application and to prevent ballooning of the material. Insert steam nozzle in center hole of bottom plate of frame and apply steam
10、for 15 s in a fan pattern, following the long dimension of the frame in each direction (total 30 s). Note: In steaming, extreme care must be exercised to keep steam nozzle from points at a right angle to the headlining to prevent blistering of the material. 6. Immediately after steaming, place frame
11、 in cold box for 1 h at - 20 OF. Remove frame from cold box and place in oven for 1 h at 180 OF. Remove from oven and condition, laying flat with vinyl side up, for 20 h at 70 +/- 2 OF and 65 +/- 2 % relative humidity. 7. Measure the amount of sag as described in Step #4. Subtract initial sag and re
12、cord results. Note: Since this test procedure has basically been developed for evaluating sag properties of roll goods, extreme care must be exercised in testing headlining assemblies with seams. Therefore, to eliminate other unknown factors in the test, it is recommended that the test sample includ
13、e only one seam, preferably centered in the frame. 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. Page 2 of 3 Copynght02001, Ford Global Technologies, Inc F
14、ORD LABORATORY TEST METHOD BN 025-01 SAG TEST FOR VINYL HEADLINING Fixture for Vinyl Headlining Sag Test FABRICATED STEEL BASE STARRETT NO. 640431 DEPTH GAGE FOR DIAL GAGE x lb INCH ANGLE I OR U CHANNEL li16 INCH ALUMINUM SHEET WITH 1“ HOLE IN CENTER WOOD FRAME x 36 INCHES. Page 3 of 3 Copynght02001, Ford Global Technologies, Inc
