1、 FORD LABORATORY TEST METHOD BU 114-01 Date Action Revisions 2000 11 13 Revised Editorial no technical change A. Cockman 1990 03 07 Printed copies are uncontrolled Page 1 of 4 Copyright 2000, Ford Global Technologies, Inc. COMPRESSIBILITY AND RECOVERY BEHAVIOR OF WINDSHIELD AND BACKLIGHT PREFORMED S
2、EALER TAPE Application This procedure is used to determine the compressibility and recovery behavior of bonding tape. The force required to compress a specified amount of tape , and the amount of recovery is determined after specified periods of time. Apparatus and Materials Required Testing Machine
3、 Capable of measuring the required pressures. It is suggested that an automatic compression type machine be used with a minor sc ale of approximately 0 - 3.0 kg and a major scale of 0 - 250 kg. It must be capable of a cross - head speed of 50 mm/minute. Stopwatch Thickness Gauge Capable of measuring
4、 thicknesses up to 25 +/ - 0.02 mm. The gauge must be equipped to provide a 0.5 kg l oad over a contact area of approximately 10 cm 2 . Glass Plates Flat polished plate glass 75 mm x 75 mm x 6 mm. Test Specimens Samples of tape 75 mm long with a cross section as specified on the relevant Engineering
5、 Drawing. Samples must have a uniform cr oss -section over the entire 75 mm length. Five specimens are required for this test. Conditioning and Test Conditions All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/ - 2 C and 50 +/ - 5 % relat ive humid
6、ity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. FORD LABORATORY TEST METHOD BU 114-01 Page 2 of 4 Copyright 2000, Ford Global Technologies, Inc. Procedure 1. Using the thickness gauge, measure the combined height of two pieces of glass pla
7、te under a load of .5 kg to the nearest 0.02 mm and mark the mating surfaces. 2. Without changing the relationship of the glass plates, center them on the base plate of the testing machine. 3. Lower the cross - head of the testing machine until a compression load of 0.5 kg is exerted on the glas s p
8、lates. (The load can be read directly from the machine chart using the minor scale). Set the return dial to zero while the glass is underload. 4. Raise the cross - head until the return dial indicates precisely 3.0 mm and again set the return dial to z ero. At the same time set the “Return - Stop“ s
9、witch to “Stop“. Note: The completion of Step 4 fixes the control over the compressed tape height at 3.0 mm and must be repeated for each test. Once the adjustment is completed the machine cross - head is halted in compression at 3.0 mm plus the combined thickness of the glass plates. 5. Set the cro
10、ss -head speed to 50 mm/minute and raise the cross - head approximately 50 mm above stop height determined in step 4. 6. Prepare the test assembly as shown in Fig ure 1. 7. Center the assembly on the base plate of the testing machine and, if necessary, depending on the type of machine, adjust to com
11、pensate for the weight of the assembly using the minor scale. 8. Set the load scale to the major kg range. 9. Compre ss the assembly at a rate of 50 mm/minute. When the machine automatically stops at a tape thickness of 3.0 mm start the stopwatch. The compressive load in kg must be recorded immediat
12、ely when the 3.0 mm thickness gauge is reached. 10. Maintain the 3.0 m m thickness for 1 minute. At the end of the minute raise the cross - head and remove the sample taking care not to disturb it unnecessarily. Do not stop the stopwatch. 11. Exactly 5 minutes after removing the sample from the mach
13、ine, measure the combined thickness of the glass and tape, using the thickness tester to the nearest .02 mm. 12. Repeat step 11 after 24 hours +/ - 5 minutes. FORD LABORATORY TEST METHOD BU 114-01 Page 3 of 4 Copyright 2000, Ford Global Technologies, Inc. Evaluation The recovery height of the tape i
14、s calculated as follows: R 1 (mm) = T 1 T G R 2 (mm) = T 2 T G Where: R 1 = Recovery Height in mm after 5 minutes. R 2 = Recovery Height in mm after 2 hours +/ - 5 minutes. T 1 = Thickness of assembly in mm after 5 minutes. T 2 = Thickness of assembly in mm after 2 hours +/ - 5 minutes. T G = Thickn
15、ess of glass plates in mm as determined in Procedure paragraph 1. Record the compressive load in kg from Procedure paragraph 9 and the Recovery Height in mm at the 5 minute and the 2 hour +/ - 5 minute stages as the average of the 5 test assemblies. Chemicals, materials, parts, and equipment referen
16、ced in this document must be used and handled properly. Each party is responsible for determining proper use and handling in its facilities. FORD LABORATORY TEST METHOD BU 114-01 Page 4 of 4 Copyright 2000, Ford Global Technologies, Inc. COMPRESSIBILITY AND RECOVERY BEHAVIOR OF WINDSHIELD AND BACKLIGHT PREFORMED SEALER TAPE TEST ASSEMBLY Figure 1
