FZ/T 01086-2000 English PDF (FZT01086-2000)

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FZ/T 01086-2000: Textiles - Test method for yarn hairness. Projection counting method
FZ/T 01086-2000
FZ
TEXTILE INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
Textiles - Test method for yarn hairness - Projection
counting method
APPROVED ON: SEPTEMBER 27, 2000
IMPLEMENTED ON: APRIL 01, 2001
Issued by: State Bureau of Textile Industry
[Replaced]
Table of Contents
Foreword ... 3
1 Scope ... 4
2 References ... 4
3 Definitions ... 4
4 Principle ... 5
5 Instruments ... 5
6 Sample quantity and test times ... 6
7 Pre-humidification and humidification ... 7
8 Setting of test parameters ... 7
9 Operating procedures ... 7
10 Test results ... 8
11 Test report ... 8
______________________________________________________________________
1 Scope
This Standard specifies the method for measuring the hairness of short fiber yarns using
an optical projection hairness meter.
This Standard applies to:
a) Cotton yarn and cotton fiber yarn;
b) Wool yarn and wool fiber yarn;
c) Linen yarn;
d) Silk spinning yarn;
e) Medium to long fiber yarn;
f) All types of blended yarns.
This Standard does not apply to high elastic and bulky yarns.
2 References
The following documents are essential to the application of this Standard. For the dated
documents, only the versions with the dates indicated are applicable to this Standard;
for the undated documents, only the latest version (including all the amendments) is
applicable to this Standard.
GB 6529-1986, Standard atmospheres for textiles conditioning and testing
GB/T 8170-1987, Rules for rounding off of numerical values
3 Definitions
This Standard uses the following definitions.
TEXTILE INDUSTRY STANDARD OF THE PEOPLE’S
REPUBLIC OF CHINA
Textiles - Test method for yarn hairness -Projection counting method
Replacing FZ/T 01086-1999
3.1 yarn hairness
The fiber end or loop that sticks out of the main body of the yarn.
3.2 hairness protruding length
The length by which fiber ends or loops protrude from the basic surface of the yarn.
3.3 hairness setting length
The specified length of hair extension.
3.4 hairness index
The cumulative number of hairy roots that extend beyond a certain set length on one
side of the yarn per unit length, unit: roots/m.
4 Principle
4.1 There is hairness all around the yarn. The amount of hairness on one side of the test
is directly proportional to the actual amount of hairness in the yarn. Therefore, the
hairness index indicates the hairness of the yarn.
4.2 When the continuously moving yarn passes through the detection area, its hairness
will block the projection beam accordingly. At this time, the photoelectric device
converts the imaging hairness into electrical signals. The signal is processed by the
subsequent circuit. The hairness index is classified and counted according to different
set lengths.
5 Instruments
The photoelectric yarn hairness tester shall at least meet the following requirements:
5.1 You can select the hairness setting length and yarn segment length as needed. The
accuracy of hairness setting length is required to be no less than 0.1 mm. The hairness
resolution is not less than 0.5 mm.
5.2 It can detect the hairness index of different set lengths. The maximum hairness
setting length is not less than 8 mm. The maximum separation is 1 mm. It can detect
the hairness distribution of different yarn segment lengths.
5.3 The test speed, number of tests and pre-tension can be changed as needed.
5.4 The hairness index of the measured yarn can be accurately counted. The statistical
value can be calculated, displayed and printed.
5.5 A yarn tension meter can be attached to check the yarn tension. The graduation value
Humidify the specimen according to the provisions of Chapter 6. Conduct all tests in
the test atmosphere specified above.
9.2 Instrument calibration
Make adjustments according to the instructions for using the instrument.
9.3 Load the specimen into the instrument according to the correct yarn feeding route.
After starting, use a yarn tension meter to check and adjust the pre-tension until the
jitter of the yarn is as small as possible. Generally, the tension of wool yarn is
(0.25±0.025) cN/tex, and that of other yarns is (0.5±0.l) cN/tex.
9.4 Load the yarn and start the instrument. Record or print the test results when the test
reaches the specified length.
10 Test results
10.1 Calculate the average hairness index and coefficient of variation of the sample.
10.2 The test results shall be rounded to three significant figures according to the
method specified in GB/T 8170.
11 Test report
The test report shall state that the test is conducted in accordance with this Standard and
report the following:
a) Humidity control, atmospheric temperature and relative humidity used for testing,
and specimen exposure time;
b) Batch number or other identification of the sample;
c) Material, specification, quantity and packaging form of the sample;
d) Sampling time, quantity and storage days;
e) Instrument model;
f) Specimen pre-tension, set length of hairness, yarn segment length, number of tests
and test speed;
g) Average hairness index and coefficient of variation of the sample;
h) Test date;
i) Any detail that deviates from this Standard.