1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW4141 Pile Distortion - Environmental Copyright 2011 General Motors Company All Rights Reserved November 2011 Originating Department: North American Engineering Standards Page 1 of 2 1 Scope Note: Nothing in this standard supercedes applicable laws a
2、nd regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This test shall be used to determine the ability of pile fabrics to resist appearance change due to environmental conditions of heat and humidity under a
3、 load. 1.2 Foreword. This test procedure assesses the ability of a pile fabric to retain its appearance after a weight is placed in a localized area for a prescribed period of time while exposed to a moderately high temperature and humid environment. 1.3 Applicability. This test is applicable to pil
4、e fabrics used for seating or other applications where crushing tendencies need to be evaluated. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. GMW3221 GMW14231 2.3 Addition
5、al References. None. 3 Resources 3.1 Facilities. 3.1.1 Conditioning Chamber. A conditioning chamber capable of maintaining an environment of 50 C 3 C and 35 5% relative humidity (RH). 3.2 Equipment. 3.2.1 Glass Plate. One glass plate having the approximate dimensions 100 mm x 100 mm x 5 mm. 3.2.2 We
6、ight. 1 kg 0.01 kg weight having a flat base of 40 mm 5 mm in diameter. 3.2.3 Brush. Soft toothbrush or equivalent. 3.2.4 Cutting dies or shears for preparation of test specimens. 3.2.5 Apparatus for conditioning to the appropriate requirements as described in GMW3221 Code A, unless otherwise specif
7、ied in the relevant materials specification. 3.3 Test Vehicle/Test Piece. Not applicable. 3.4 Test Time. Calendar time: 2 days Test hours: 6 hours Coordination hours: 5 hours 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. 4.1.1 At le
8、ast one test specimen 80 mm 5 mm x 80 mm 5 mm shall be prepared. 4.1.2 Unless otherwise specified in the relevant materials specification, conditioning shall be performed according to GMW3221 Code A. 4.2 Conditions. 4.2.1 Environmental Conditions. Not applicable. 4.2.2 Test Conditions. Deviations fr
9、om the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 Pre-condition the weight and glass plate for a minimum of 2 h in a conditioning chamber which has been stabilized at
10、50 C 3 C and 35 5% RH. 4.3.2 Inside the conditioning chamber, place the test specimen face side up on the glass plate and place the weight centrally on the test specimen. 4.3.3 Condition the assembly in this environment for 6 0.25 h. 4.3.4 Remove the weight from the test specimen and remove the test
11、 specimen from the conditioning chamber. 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 GMW4141 Copyright 2011 General Motors Company All R
12、ights Reserved November 2011 Page 2 of 2 4.3.5 Cool the test specimen at ambient laboratory conditions for a minimum of 2 h. 4.3.6 Using a soft toothbrush, brush the entire test area 2 to 3 strokes against the pile direction. 5 Data 5.1 Calculations. Determine the degree of difference between the te
13、sted area and the surrounding area. Use the following descriptions to determine the rating. 10 = No change. 8 = Slight pile distortion. 6 = Moderate. Noticeable pile distortion that can be removed when the surface of the test specimen is brushed. 4 = Significant. Very noticeable pile distortion that
14、 remains after the surface of the test specimen is brushed. 2 = Severe. Excessive pile distortion. Permanent, unacceptable change in appearance. 5.1.1 Evaluate the sample from all 4 principal directions (down the nap, into the nap, across the nap from left, and across the nap from right). 5.2 Interp
15、retation of Results. Not applicable. 5.3 Test Documentation. Results are reported on the lab data form included with GMW14231. 5.3.1 Report the worst rating of those from the four principal directions. 5.3.2 In reporting the test results, include the tested specimen and mark the specimen indicating
16、the direction used in determining the result. 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 s
17、afety and health practices and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. RH Relative Humidity TDG Textile Development Group 8 Coding System This standard shall be referenced in other documents,
18、drawings, etc., as follows: Test to GMW4141 9 Release and Revisions This standard was originated in May 2000. It was first approved by the Worldwide Fabric Specification Team in July 2000. It was first published in December 2000. Issue Publication Date Description (Organization) 1 DEC 2000 Initial p
19、ublication. 2 JAN 2006 Global Textile Development Group (TDG) revision. 3 NOV 2011 Five year refresh; standard placed in a Test Procedure template. Added content to 1.3 Applicability and 3.4 Test Time. (Textiles Global Subsystem Leadership Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
