GB/T 3820-1997 English PDF (GB/T3820-1997)

GB/T 3820-1997: Determination of thickness of textiles and textile products
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GB/T 3820-1997
GB
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
3. No action is required - Full-copy of this standard will be automatically and
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 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 . 10 
Foreword
This 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 products
1 Scope
This 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 references
The 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 Definitions
The 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.
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
7.2.1 The samples collected according to Subclause 7.1 can be directly used
as the test pieces. During the test, the measuring parts shall be arranged in a
ladder evenly in the area above 150mm from the selvedge. The measuring
points are not in the same longitudinal and transverse positions, and shall avoid
the flaws and wrinkles that affect the test results.
7.2.2 For samples that are susceptible to deformation or may affect the test
operations, such as certain knitted fabrics, nonwovens or wide fabrics and
textile products, etc., a sufficient number of test pieces shall be cut in
accordance with Table 1. The requirements for sample cutting shall be in
accordance with Subclause 7.2.1. The dimensions of the test pieces shall not
be less than the presser foot dimensions.
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. It is generally
necessary to perform conditioning for more than 16h. Synthetic fiber samples
shall be equilibrated for at least 2h. The samples with a conventional moisture
regain of zero can be determined directly.
8 Test procedures
8.1 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.
8.2 CLEAN the presser foot (5.1.1) and reference plate (5.1.2) to check the
movement flexibility of the presser foot shaft. SET the pressure according to
Table 1. Then DRIVE the presser foot against the reference plate, and SET the
thickness meter (5.1.4) to zero.
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
GB/T 3820-1997
GB
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
3. No action is required - Full-copy of this standard will be automatically and
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 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 . 10 
Foreword
This 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 products
1 Scope
This 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 references
The 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 Definitions
The 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.
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
7.2.1 The samples collected according to Subclause 7.1 can be directly used
as the test pieces. During the test, the measuring parts shall be arranged in a
ladder evenly in the area above 150mm from the selvedge. The measuring
points are not in the same longitudinal and transverse positions, and shall avoid
the flaws and wrinkles that affect the test results.
7.2.2 For samples that are susceptible to deformation or may affect the test
operations, such as certain knitted fabrics, nonwovens or wide fabrics and
textile products, etc., a sufficient number of test pieces shall be cut in
accordance with Table 1. The requirements for sample cutting shall be in
accordance with Subclause 7.2.1. The dimensions of the test pieces shall not
be less than the presser foot dimensions.
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. It is generally
necessary to perform conditioning for more than 16h. Synthetic fiber samples
shall be equilibrated for at least 2h. The samples with a conventional moisture
regain of zero can be determined directly.
8 Test procedures
8.1 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.
8.2 CLEAN the presser foot (5.1.1) and reference plate (5.1.2) to check the
movement flexibility of the presser foot shaft. SET the pressure according to
Table 1. Then DRIVE the presser foot against the reference plate, and SET the
thickness meter (5.1.4) to zero.
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