1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW16774 Flock Adhesion Tests for Weatherstrips Copyright 2012 General Motors Company All Rights Reserved June 2012 Originating Department: North American Engineering Standards Page 1 of 9 1 Scope Note: Nothing in this standard supercedes applicable la
2、ws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This procedure is used to determine the adhesion characteristics of fiber coated (flocked) parts by measuring the bond strength between the flock and
3、 the substrate. Method A is used to determine adhesion characteristics of flock tape. Method B is used to determine the characteristics of electrostatically applied flock. Method C is used to determine the characteristics of electrostatically applied flock in smaller post flocked areas such as molde
4、d corners. 1.2 Foreword. Not applicable. 1.3 Applicability. This procedure is applicable to all flocked weatherstrips. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. 9981062
5、 B 440 0029 3 Resources 3.1 Facilities. Not applicable. 3.2 Equipment. 3.2.1 Razor knife. 3.2.2 Spring scale capable of measuring 0 N to 10 N. 3.2.3 Clean white cheesecloth. 3.2.4 Naphtha solvent, 9981062 or B 440 0029. 3.2.5 Humidity chamber. 3.2.6 Hot melt adhesive gun. 3.2.7 Hot melt adhesive, Ad
6、chem No.7301-13 or equivalent. 3.2.8 Hot melt fixture/mold, to create a flow channel 75 mm x 5 mm x 5 mm for Method B. See Appendix A, Figure A1. 3.2.9 Hot melt fixture/mold and clamping device, to create a flow channel for Method C. See Appendix A, Figures A3 and A4. 3.2.10 Force gage or tensile te
7、st machine. 3.2.11 Clamps/jaws with serrated faces. 3.2.12 Clamping fixture suitable to securely hold hot melt fixture used in Method C (See Appendix A, Figure A6). Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking p
8、ermitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16774 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 2 of 9 3.3 Test Vehicle/Test Piece. Test samples shall be cut from finished parts. For Method A, cut 3 samples approximately 150 mm x 40 mm. For
9、Method B, cut 6 samples approximately 150 mm x 40 mm. For Method C, cut 6 samples of sufficient size (minimum width of 15 mm). 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. See Methods listed in sectio
10、n 4.3. 4.2 Conditions. Unless otherwise specified, the tests shall be performed at 23 C 5 C. 4.2.1 Environmental Conditions. The minimum time period between vulcanization and testing of elastomers shall be 72 h. The test piece shall remain at a temperature of 23 C 5 C for at least 8 h before testing
11、 and shall be free from strain during this period. 4.2.1.1 Moisture Exposure. Test pieces shall be exposed for 24 h 0.1 h at 38 C 2 C and 95% 5% relative humidity (RH). 4.2.1.2 Solvent Exposure. Saturate a clean white cheesecloth with naphtha and wring out excess. Fold the solvent-dampened cloth and
12、 place onto the face of the sample. Leave in place for 5 minutes. The cloth shall cover the entire face of the sample. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon by the GM engineer or Weatherstrip GSSLT. Such requirements shall be specified o
13、n component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Method A - Knife Peel Test for Flock Tape. This test is to be performed on 1 sample as received, 1 sample after moisture exposure, and 1 sample after solvent exposure. 4.3.1.1 Cut 2 parallel lines 30 mm 3 mm in length app
14、roximately 6.5 mm apart. Cuts shall be through the flock tape to the substrate. 4.3.1.2 Peel back only enough of the fiber coating/adhesive film (flock tape) to place into the spring scale clip. 4.3.1.3 Peel the strip at a 180 degrees angle at a rate of 250 mm/minute. 4.3.2 Method B - Hot Melt Peel
15、Test for Electrostatically Applied Flock on Extruded Profiles. This test is to be performed on 3 samples as received and three samples after moisture exposure. 4.3.2.1 Sample Preparation. 4.3.2.1.1 Mount flocking sample into fixture/mold. Position flock side towards hot melt channel and towards one
16、end of the sample. Clamp tight to prevent adhesive leakage. Inject hot adhesive into mold port, making sure gun tip is held flush with inlet until adhesive exits through port hole. 4.3.2.1.2 Allow hot melt adhesive to cool for 20 minutes 0.1 minute before cutting excess adhesive from port hole. Rele
17、ase material from mold and trim part tab flush with channel and any excess adhesive from sides of channel. Allow sample to condition for a minimum of 30 minutes at room temperature. Sample must be tested within 8 h of preparation. 4.3.2.2 Test Procedure. 4.3.2.2.1 Cut or peel substrate from adhesive
18、 for jaw clamping. Position metal plate on top of adhesive. Attach clamp or jaws to adhesive and metal plate and secure rubber substrate on same end to a stationary fixture. See Appendix A, Figure A2. 4.3.2.2.2 Pull hot melt adhesive from substrate in a 180 degrees peel at a rate of 305 mm/minute fo
19、r a minimum of 50 mm separation/peel. 4.3.2.2.3 Repeat on a minimum of 3 test samples for each exposure. 4.3.3 Method C - Hot Melt Peel Test for Electrostatically Applied Flock on Molded Corners or Extruded Profiles. This test is to be performed on 3 samples as-received and three samples after moist
20、ure exposure. 4.3.3.1 Sample Preparation. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16774 Copyright 2012 General Motors Company All
21、 Rights Reserved June 2012 Page 3 of 9 4.3.3.1.1 Mount flocking sample into fixture/mold (see Appendix A, Figure A5). Position flock side towards hot melt channel and towards one end of the sample. Clamp tight to prevent adhesive leakage. Inject hot adhesive into mold port, making sure gun tip is he
22、lp flush with inlet until adhesive exits through port hole. 4.3.3.1.2 Allow hot melt adhesive to cool for 20 minutes 0.1 minute before cutting excess adhesive from port hole. Release material from mold and trim part tab flush with channel and any excess adhesive from sides of channel. Allow sample t
23、o condition for a minimum of 30 minutes at room temperature. Sample must be tested within 8 h of preparation. 4.3.3.2 Test Procedure. 4.3.3.2.1 Place the prepared sample and fixture into the holding fixture on the testing machine, ensuring that the sample is held securely (see Appendix A, Figure A7)
24、. 4.3.3.2.2 Separate fixture/mold from flocked sample at a rate of 50 mm 5 mm/minute (see Appendix A, Figure A8). Record the peak load required to separate the hot melt mold from the flocked sample. 4.3.3.2.3 Repeat on a minimum of 3 test samples for each exposure. 5 Data 5.1 Calculations. Not appli
25、cable. 5.2 Interpretation of Results. 5.2.1 Knife Peel Results. Report the following results for as-received, after moisture exposure, and after solvent exposure: Force in newtons (N) required for peel. If unable to peel back flock tape, or if peel strength is unavailable due to breakage of the floc
26、k tape, report no adhesive failure. 5.2.2 Hot Melt Peel Results. Report the following results for each exposure condition: Force in newtons (N) for average and maximum values for each sample. Peel/tear distance in millimeters (mm). Type of separation. 5.3 Test Documentation. With reference to this t
27、est method, the results shall be represented in a test report. The report shall include the following: Complete identification of the specimen. Conditioning of the test specimen, if any. Test conditions - temperature, humidity, etc. Peel force values. Mode of separation. Any additional observations.
28、 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the
29、applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. mm millimeters N newtons RH Relative Humidity Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction
30、or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16774 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 4 of 9 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Test to GMW16774 9 Releas
31、e and Revisions This standard was originated in February 2012. It was first approved by the Elastomers Global Subsystem Leadership Team in June 2012. It was first published in June 2012. Issue Publication Date Description (Organization) 1 JUN 2012 Initial publication. Copyright General Motors Compan
32、y Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16774 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 5 of 9 Appendix A Figure A1: Hot Melt Pee
33、l Test Fixture/Mold for Method B Figure A2: Hot Melt Peel Test Loading Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16774 Copyright 20
34、12 General Motors Company All Rights Reserved June 2012 Page 6 of 9 Figure A3: Hot Melt Peel Test Fixture/Mold for Method C Figure A4: Clamping Fixture for Method C Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking p
35、ermitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16774 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 7 of 9 Figure A5: Test Sample Setup for Method C Figure A6: Holding Fixture for Method C Copyright General Motors Company Provided by IHS under l
36、icense with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16774 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 8 of 9 Figure A7: Sample and Mold Fixture Securely Mounted in Test
37、 Machine for Method C Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16774 Copyright 2012 General Motors Company All Rights Reserved June 2012 Page 9 of 9 Figure A8: Sample and Mold Fixture Separation, Method C Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
