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Similar standardsGB/T 3820-1997: Determination of thickness of textiles and textile products---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3820-1997GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 59.080.30 W 04 Replacing GB 3820-1983 Determination of thickness of textiles and textile products Issued on. OCTOBER 9, 1997 Implemented on. MAY 1, 1998 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Definitions... 4 4 Principle... 5 5 Equipment... 5 6 Atmospheres for conditioning and testing... 6 7 Sampling and preparation of samples... 6 8 Test procedures... 7 9 Expression of results... 8 10 Test report... 8 Annex A (Normative) Determination and measuring device of bulky textiles. 10ForewordThis Standard is the revision of GB 3820-83 Determination of thickness of woven and knitted fabrics. The revision of this Standard is equivalent to the latest edition of the International Standard ISO 5084.1996 Textiles - Determination of thickness of textiles and textile products. The technical contents and parameters are consistent with ISO 9073.2.1995 Textiles - Test methods for nonwovens - Part 2.Determination of thickness and ISO 9863.1990 Geotextiles - Determination of thickness at specified pressures. The revised standard is the general standard for the determination of thickness of textiles and textile products. Compared with the 1983 version of the standard, this Standard is mainly modified as follows. 1.CHANGE the standard title into Determination of thickness of textiles and textile products. 2.EXPAND the scope of application to various types of textiles and textile products. 3.ADD the classification and definition of textiles to facilitate the preparation and application. 4.MAKE major modifications on presser foot area, pressure and number of tests, and SPECIFY the specific parameters of several categories of products. 5.ADD the contents of coefficient of variation CV (%) and confidence interval for calculated thickness. Annex A of this Standard is a normative annex. This Standard was first released in March 1983, and was first revised in 1997. This Standard substitutes GB 3820-83 from the date of entry into force. This Standard was proposed by the China Textile General Association. This Standard shall be under the jurisdiction of the Basic Standard Subcommittee of the National Technical Committee for Standardization of Textiles. The Standardization Research Institute of China Textile General Association is responsible for drafting this Standard. Main drafters of this Standard. Wang Baojun and Guo Yue. Determination of thickness of textiles and textile products1 ScopeThis Standard specifies the method for determination of thickness of textiles under specified pressure. This Standard is applicable to all types of textiles and textile products.2 Normative referencesThe provisions in the following standards become the provisions of this Standard through reference in this Standard. At the time of publication of this Standard, the editions shown are valid. All standards will be revised and the parties using this Standard shall explore the possibility of using the latest editions of the following standards. GB 6529-86 Standard atmospheres for textiles conditioning and testing GB 8170-87 Rules for rounding off of numerical values GB/T 19022.1-1994 Quality assurance requirements for measuring equipment - Part 1.Metrological confirmation system for measuring equipment (idt ISO 10012.1.1992)3 DefinitionsThe following definitions are applicable to this Standard. 3.1 Thickness of a textile It refers to the vertical distance between the two reference plates that apply the specified pressure to the textiles. 3.2 Bulky textiles It refers to the textiles with a thickness variation (compression ratio) of greater than or equal to 20% when the pressure applied to the textiles increases from 0.1kPa to 0.5kPa, such as artificial furs, plush, velvet, nonwoven interlinings, etc.4 PrincipleThe sample is placed on a reference plate and is parallel to the presser foot of this plate.5 Equipment5.1 Thickness meter The thickness meter shall be conducted with metrological confirmation in accordance with GB/T 19022.1.The thickness meter shall include (or have) the following components. 5.1.2 Reference plate The surface shall be flat. The diameter shall be at least 50mm greater than the presser foot (5.1.1). 5.1.3 Presser foot moving device [the direction of movement is perpendicular to the reference plate (5.1.2) surface] The working surface of the presser foot can be maintained horizontally and parallel to the surface of the reference plate (5.1.2) with a non-parallelism of less than 0.2%. In addition, the specified pressure can be applied to the sample placed above the reference plate.6 Atmospheres for conditioning and testingThe standard atmospheres for sample conditioning and testing shall be in accordance with the provisions of GB 6529.Class II standard atmosphere shall apply. Class III standard atmosphere can be used in the conventional tests.7 Sampling and preparation of samples7.1 Sample collection The methods for sample collection and the quantity of the samples collected are in accordance with product standards. If they fail to be specified in detail in the product standards, the method agreed by the parties concerned that is of interest to the test results shall apply. 7.2 Test pieces 7.3 Conditioning Before the test, the samples or test pieces shall realize conditioning equilibrium in a relaxed state in the atmosphere specified in Chapter 6.The conditioning method and requirements shall be in accordance with GB 6529.8 Test procedures8.1 SELECT the presser foot (5.1.1) according to the sample type in Table 1. For the samples whose surfaces are of uneven pattern structure, the diameter of the presser foot shall not be less than the length of the pattern cycle. The smaller presser foot can be used to respectively determine and report the thickness of the concave and convex parts, if necessary. 8.3 RAISE the presser foot to place the test piece without tension and deformation on a reference plate. 8.4 PRESS the presser foot gently on the test piece, and MAINTAIN a constant pressure (SEE Subclause 8.2). READ the thickness indicating value after a specified time (Table 1). 8.5 REPEAT the procedures in Subclauses 8.3 to 8.4 until the specified number of parts or each test piece has been measured.9 Expression of resultsCALCULATE the arithmetic mean valuet (rounded off to 0.01mm), coefficient of variation CV (%) (rounded off to 0.1%) and 95% of the confidence interval (t ± ᇞt) (rounded off to 0.01mm) of the thicknesses measured in Chapter 8.The methods for rounding off shall be in accordance with the provisions of GB 8170.10 Test reportThe report shall include the following information. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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