GB/T 13769-2009 in English

《GB/T 13769-2009纺织品 评定织物经洗涤后外观平整度的试验方法》由TC209（全国纺织品标准化技术委员会）归口，TC209SC1（全国纺织品标准化技术委员会基础标准分会）执行，主管部门为中国纺织工业联合会。
本标准规定了一种评定织物经一次或几次洗涤处理后其原有外观平整度保持性的试验方法。
本标准主要适用于GB/T 8629规定的B型家用洗衣机的洗涤程序，也适用于A型洗衣机。
本标准可用来评定经其他洗涤程序后织物的外观平整度。

1 Scope
This standard specifies a method for assessing the retention of the original smooth appearance, after one or several cleansing treatments, of the fabrics tested.
This Standard is mainly applicable to washing procedures with Type B domestic washing machines specified in GB/T 8629, as well as Type A washing machines. This Standard may be applied to assess the smoothness appearance of fabrics after other washing procedures.
Note: It is recognized that prints and patterns will mask the mussiness present in fabrics. However, this does not detract from the smoothness appearance concept which seeks to provide the consumer with fabrics which require little or no ironing.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments (excluding amending error in the text) to, or revisions of, any of these publications do not be applied. However, the parties whose enter into agreement according to these specifications are encouraged to research whether the latest editions of these references are applied or not. For undated references, the latest edition of the normative document is applicable to this Standard.
GB/T 251 Textiles - Tests for color fastness - Grey scale for assessing staining (GB/T 251-2008, ISO 105-A03: 1993, IDT)
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing (GB/T 6529-2008, ISO 139: 2005, MOD)
GB/T 8629 Textiles - Domestic washing and drying procedures for textile testing (GB/T 8629-2001, eqv ISO 6330:2000)
GB/T 19981 (all parts) Textiles - Professional care, drycleaning and wetcleaning of fabrics and garments [ISO 31753 (All parts)]
3 Principle
Fabric specimens are subjected to procedures simulating cleansing practices. One of the domestic washing and drying procedures specified in GB/T 8629 or one of the professional procedures specified in the series of GB/T 19981 is used, as agreed between the interested parties.
4 Apparatus
4.1 Washing and drying apparatus, or professional care apparatus
As specified in GB/T 8629 or GB/T 19981.
4.2 Lighting
The evaluation area shall be a darkened room, using the overhead lighting arrangement shown in Figure 1 and comprising the following items (apparatus). Lamp dimensions should be chosen to extend beyond the overall surface of a test specimen and three-dimensional smoothness appearance replicas, when used for the assessment.
4.2.1 Two CW (cool white) fluorescent lamps, without baffle or glass, a minimum of 2 m in length each, placed side by side.
4.2.2 One white enamel reflector, without baffle or glass.
4.2.3 One specimen holder.
4.2.4 One thick plywood viewing board, painted grey to match the No. 2 rating on the grey scale forassessing staining specified in GB/T 251.
4.3 Three-dimensional smoothness appearance replicas
Used assessing the rating of the smoothness appearance (See Figure 2) ).

1 Scope
2 Normative References
3 Principle
4 Apparatus
5 Test Specimen
6 Procedure
7 Expression of Results
8 Test Report
Appendix A (Informative) Precision and Accuracy