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FZ/T 01050-1997 PDF in English

FZ/T 01050-1997 (FZ/T01050-1997, FZT 01050-1997, FZT01050-1997)
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FZ/T 01050-1997: PDF in English (FZT 01050-1997)

FZ/T 01050-1997
Textiles - Classifying and Testing Method of Yarn
Faults - Capacitance
ISSUED ON: MAY 26, 1997
Issued by: China National Textile Council
Table of Contents
1 Scope...4
2 Normative References... 4
3 Definitions...4
4 Classification of Yarn Faults...5
5 Principle...6
6 Apparatus... 6
7 Sampling Quantity and Test Length...6
8 Atmospheric Conditions... 7
9 Setting of Main Parameters...7
10 Procedures...8
11 Test Results and Presentation... 9
12 Test Report...9
Textiles - Classifying and Testing Method of Yarn
Faults - Capacitance
1 Scope
This Standard specifies the method for classifying and testing staple yarn faults by a
capacitive yarn fault classifier.
This Standard is applicable to pure or blended staple yarns spun from cotton, wool,
hemp, chemical fibre, spun silk and other materials with a linear density in the range
of 5~100 tex.
This Standard is not applicable to chemical fibre filaments and yarns spun with
conductive materials.
2 Normative References
The following standards contain provisions which, through reference in this Standard,
constitute provisions of this Standard. At the time of publication, the editions indicated
are valid. All standards are subject to revision. The parties who are using this
Standard shall explore the possibility of using the latest version of the following
GB 3291-1982 Textile Terms and Definitions (General Part for Textiles)
GB 6529-1986 Standard Atmospheres for Textiles Conditioning and Testing
GB 8170-1987 Rules for Rounding off of Numerical Values
3 Definitions
This Standard uses the following definitions.
3.1 Material value
The value set in order to adjust the sensitivity of the yarn fault classifier, which is
related to factors such as the relative humidity of the test material and air.
3.2 Harmful yarn fault
7.2 The taken samples shall be evenly distributed on each detector.
7.3 In daily inspections, a set of test lengths shall be no less than 100,000m, of which
woollen yarns can be appropriately reduced, but at least 50,000m. For arbitration
inspections, more than four sets of tests shall be carried out.
8 Atmospheric Conditions
8.1 The conditioning of the specimen shall adopt the secondary standard atmosphere
specified in GB 6529, that is, equilibrate at a temperature of 20°C±2°C and a relative
humidity of 65%±3% for more than 24h. When the large and tight sample package or
one package needs to be tested for more than once, it shall be equilibrated for more
than 48h. The standard atmosphere shall be kept constant during the conditioning
and test process until the end of the test.
8.2 The specimen shall be adjusted and balanced under moisture absorption. If
necessary, it can be pre-conditioned according to GB 6529.
8.3 If the factory test room does not have the above conditions, the test can be carried
out under the following stable temperature and humidity conditions, after the
specimen reaches the humidity balance (the mass change of continuous weighing
every 30min does not exceed 0.1%).
The average temperature is 18~28°C, and the average relative humidity is 55%~70%
during the conditioning and test period. At the same time, it shall be ensured that the
temperature change does not exceed an average temperature within the above range
±3°C; the relative humidity change does not exceed an average relative humidity
within the above range ± 3%.
The product acceptance and arbitration inspection shall be implemented in
accordance with 8.1 and 8.2.
9 Setting of Main Parameters
9.1 Linear density. Set according to the nominal linear density.
9.2 Winding speed. 600m/min is recommended. At the same time, it shall be ensured
that the difference between the setting speed of the instrument and the winding speed
does not exceed ±10%.
9.2.1 The method of measuring the winding speed can be measured by a friction
wheel tachometer in the middle of a half-full bobbin, or it can be estimated by
weighing the yarn mass within a certain period of time to convert the length.
10.4.2 The measuring tank shall be cleaned before the test. After the yarn breaks or
yarn faults are cut off during the test, the residual yarn in the measuring tank shall be
removed immediately, and the splicing shall be continued for the test after at least
10.4.3 During the test, the area around the measuring tank shall be cleaned
frequently to prevent flying from entering the measuring tank.
10.4.4 After each splicing, it shall be put into the measuring tank after the yarn speed
reaches normal speed.
10.4.5When the sample is unwound to the last few turns of the package, it is prone to
unloop, and false yarn fault signals appear. Therefore, the last few turns of yarn shall
be discarded during operation.
11 Test Results and Presentation
11.1 The test results can generally be expressed in two ways, namely, the number of
yarn faults at various levels of 100,000m, and the number of harmful yarn faults of
100,000m. The range of harmful yarn faults is determined according to product
standards or relevant agreements.
11.2 During product acceptance and arbitration inspection, take the average of the
four groups of specimens, and calculate the standard deviation (or coefficient of
variation) if necessary.
11.3 The test results shall be rounded off according to the method specified in GB
8170. The number of yarn faults of 100,000 meters shall be kept in integer, and the
remaining parts shall be retained for three significant figures.
12 Test Report
Explain that the test is carried out in accordance with this Standard, and report the
a) Sample materials, specifications and quantity, and if necessary, indicate the
source of the sample
b) Test environmental conditions (temperature, humidity);
c) Instrument model;
d) Necessary test parameters such as material value and sampling length;
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.