GB/T 4668-1995 PDF English
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GB/T 4668-1995 | English | 70 |
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Textiles - Woven fabrics - Determination of number of threads per unit length
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GB 4668-1984 | English | 199 |
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Textiles--Woven fabrics--Determination of number of threads per unit length
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GB/T 4668-1995: Textiles - Woven fabrics - Determination of number of threads per unit length---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/GBT4668-1995
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.30
W 04
Replacing GB 4668-84 and GB 8678-88
Textiles - Woven Fabrics - Determination of
Number of Threads per Unit Length
Issued on. DECEMBER 08, 1995
Implemented on. MAY 01, 1996
Issued by. State Bureau of Technical Supervision
Table of Contents
1 Subject Content and Application Scope... 3
2 Normative References... 3
3 Definitions... 3
4 Principle... 4
5 Minimum Measuring Distance... 4
6 Conditioning and Testing Atmosphere... 4
7 Test Specimen... 5
8 Method A - Dissection of Fabric... 5
9 Method B - Counting Glass... 5
10 Method C - Traversing Thread Counter... 6
11 Calculation and Expression of Results... 7
12 Test Report... 7
Annex A Method for the Determination of the Number of Threads Using
Gratings and Optoelectronic Scanner (Informative)... 8
Additional Explanation... 11
Textiles-Woven Fabrics-Determination of Number of
Threads per Unit Length
This standard is based on the international standard ISO 7211/2-1984 "Textiles -
Woven Fabrics – Construction - Methods of Analysis - Part 2.Determination of
Number of Threads per Unit Length".
1 Subject Content and Application Scope
This standard specifies three methods for the determination of number of threads per
unit length in woven fabrics. Any of the three methods may be used, the choice
depending on the character of the fabric. However, in case of dispute method A is
recommended.
This standard is applicable to the determination of number of threads per unit length in
various woven fabrics.
Method A. Dissection of fabric, suitable for all fabrics, in particular, complicated
weaves.
Method B. Counting glass, suitable for fabrics with more than 50 threads per
centimetre.
Method C. Traversing thread counter, suitable for all woven fabrics.
Note. Three methods using parallel line gratings, tapered line gratings and optoelectronic scanning density meter for
the determination of number of threads per unit length in woven fabrics have been given in Annex A (Informative) for
information. These methods have low measurement accuracy and limitation but can be used to give rapid and rough
estimates.
2 Normative References
GB 6529 Textiles - Standard Atmospheres for Conditioning and Testing
3 Definitions
3.1 Number of threads per unit length. warp number and weft number per unit length
in woven fabrics under no wrinkle or tension, generally expressed with root/10cm.
3.2 Number of threads in warp direction. number of warp threads per unit length in
fabric weft direction.
4 Principle
Any of the following three methods may be used, the choice depending on the
character of the fabric.
4.1 Method A. dissect the fabric test pieces with specified dimension, count the
number of threads, and convert to the number of threads of 10cm length.
4.2 Method B. Determine the number of threads visible within the aperture of a
counting glass, and convert to the number of threads within 10cm length.
5 Minimum Measuring Distance
5.1 For the method A, take test pieces containing at least 100 threads.
5.2 For narrow fabrics having a width of 10cm or less, count all warp threads
including the selvedge ends and express the result as threads per full width.
6 Conditioning and Testing Atmosphere
The atmospheres for conditioning and testing shall adopt the standard atmosphere
specified in GB 6529, and arbitration test shall adopt Grade 2 standard atmosphere.
Routine inspection may be carried out in general atmosphere.
7 Test Specimen
The specimens shall be flat and smooth and free from wrinkle and obvious skew.
8 Method A - Dissection of Fabric
8.1 Apparatus
8.2 Procedure
8.2.1 Take test specimens slightly larger than the minimum measuring distance at
proper position of the specimen after conditioning.
8.2.2 Remove partial thread from the specimen edge, and measure with a steel ruler
to make the specimen reach the specified minimum measuring distance 2cm, with an
allowable tolerance of 0.5 thread.
9 Method B - Counting Glass
9.1 Apparatus
9.1.1 Counting glass, the aperture width of which shall be 2±0.005cm or 3±0.005cm
at all places. The thickness at the edges of the aperture shall not exceed 0.1cm.
9.2 Procedure
9.2.1 Lay the fabric flat and place the counting glass on the fabric, and select a
thread to make it parallel to one of the edges of the aperture of the counting glass,
and thereby count the number of threads within the aperture one by one.
10 Method C - Traversing Thread Counter
10.1 Apparatus
10.1.1 Traversing thread counter, incorporating a low-power microscope, of X5 to
X20, mounted so that it can be traversed by means of a screw over a graduated base
to meet the minimum measuring distance requirements of Chapter 5.Types with an
index line in the microscope or a pointer traversing with and visible through the
microscope are equally suitable.
10.2 Procedure
Lay the fabric flat and place the thread counter upon it in such a way that when the
screw is turned the graduated scale of the thread counter is parallel to the thread of
another system, depending on which set of threads is being counted. Count the
number of threads within the specified measuring distance.
11 Calculation and Expression of Results
11.1 Convert the measured number of threads within a certain length to the number
of threads within 10cm length.
11.2 Respectively calculate the mean of the number of threads in warp and weft
directions, accurate to 0.1 root/10cm.
...... Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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