This standard is a test method for determining the breaking strength of ramie single fiber. All tests during production, acceptance and delivery shall be conducted in accordance with this standard. GB 5886-1986 Test method for breaking strength of ramie single fiber GB5886-1986 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Testing method of single
fiber breaking tenacity of ramleUDC 677.151.014
GB 5886—86
This standard is the test method for determining the breaking strength of ramie single fiber. All tests required for inspection during production, acceptance and delivery shall be conducted in accordance with this standard.
1 Sampling
The test shall be conducted in accordance with the provisions of GB5881-86 "Sampling Method for Test of Physical and Chemical Properties of Ramie". 2 Test conditions
2.1 The test shall be conducted under standard atmospheric conditions. Standard atmospheric conditions of the test room: temperature 20±3℃, relative humidity 65±5%. 2.2 If these conditions are not met, the test may be conducted under non-standard atmospheric conditions, but the test conditions must be stable. The temperature and humidity conditions during the test shall be indicated in the records and reports, and the data shall be corrected according to standard conditions. 2.3 The water should be running water, clear and clean, and the water pressure should be stable. Otherwise, filtering and pressure stabilization measures should be taken. The water pressure at the water inlet of the single fiber strength tester should be stable within the range of 1.0 ± 0.1 kgf/cm. 3 Test cycle
Periodic tests can be carried out as needed. Each product variety shall be tested at least once a day. The test cycle during acceptance and delivery shall be agreed upon by both parties.
4 Test instrument
4.1 Strength tester
Single fiber strength tester.
Technical parameters
Strength test range: 1~100g;
Lower clamp descending speed: 0~20cm/min, elongation indication range: 0~25mmzwwW.bzxz.Net
Lower clamp descending maximum stroke: 44mm; distance between upper and lower clamps: 10, 20,
"Small brush,
Sparse comb: 8~10 needles/cm,
Stopwatch: 1/10S,
Glass plate: 9cm×15cmz
Tweezers: stainless steel, 12~15cms
Black velvet plate: 15cm×25cm,
Ordinary shear force
National Bureau of Standards 1986-01-21 Issued
Reference model
Y161 type
10, 20, 30~100mm
1986— 10- 01 Implementation
5 Test method
5.1 Preparation before test
5.1.1 Preparation of dried flax sample
GB 5886—86
Spread the samples on the table, cut them from the folded part of the dried flax base and tip, and then cut 10cm from the base. Mix and comb them evenly, and randomly extract the fibers inside. The total weight is about 2. 5.1.2 Preparation of combed fiber sample
Spread the samples on the table, and randomly extract the fibers with a total weight of about 2 from different parts. 5.1.3 Pre-humidification treatment of samples
Put the samples on 40~50 ℃ low temperature drying oven, pre-dry for 1.5h, take out and place under standard atmospheric conditions for hygroscopic balance for 24h, so that the moisture in the fiber reaches the standard equilibrium state. The results of the rapid test should be corrected.
5.1.4 Instrument preparation
Adjust the instrument to normal state, make the distance between the upper and lower clamps 30mm, and control the lower clamp descending speed so that the time to break each fiber is 20±3s.
5.2 Test steps
5.2.1 Hemp Bundle Arrangement
Draw out about 300m of fiber from the balanced sample, first hold the fiber bundle with the thumb and index finger of the right hand, then transfer one end evenly to the holding point between the thumb and index finger of the left hand in the order of fiber length. Repeat the transfer and arrangement twice with both hands to achieve a flax bundle with long fibers at the bottom and short fibers at the top, with a width of about 10 to 15mm. 5.2.2 Combing
Use tweezers carefully to remove the strands and impurities in the flax bundle. Use a sparse comb to gently comb the flax bundle. Gently comb the hemp bundle to remove the free fibers. 5.2.3 Bunching
Put the finished hemp bundles together layer by layer on the glass plate according to the length of the fibers, and then split them horizontally, a total of 15 bundles, each small bundle weighing about 2 mg.
5.2.4 Extracting single fiber samples
Use tweezers to randomly extract about 20 fibers from each fiber bundle in turn, straighten them and arrange them neatly on the black velvet board, and extract about 300 fibers in total (250 fibers for testing).
5.2.5 Stretching
5.2.5.1 Hang a 100g counterweight and select an 18 tension clamp to clamp one end of the fiber and clamp the other end of the fiber in the jaws of the upper clamp.
5.2.5.2 Raise the upper clamp to the highest position and fix the swing arm with the swing arm brake. Open the electromagnet start contact and do not energize the electromagnet.
Hang the upper clamp on the right edge of the fan plate with your right hand. The action should be gentle when hanging and prevent the fiber tension clamp from shaking. 5.2.5.32
Tighten the screw of the lower clamp, clamp the fiber, and remove the fiber tension clamp. 5.2.5.5 Use the dial to turn the passive indicator needle back to zero. 5.2.5.6 Open the swing lever brake with your left hand. 5.2.5.7 Turn the adjustment valve handle clockwise to the horizontal position with your right hand to lower the lower clamp. After the fiber breaks, the heavy hammer swing lever swings back, pushing the electromagnet start contact, the electromagnet operates, and the extension scale stops moving. 5.2.5.8 Turn the adjustment valve handle counterclockwise to the position of 45° with the horizontal with your right hand, and the lower clamp stops moving. With your left hand, turn the swing arm brake back, fix the swing arm, and manually disengage the electromagnet start contact to cut off the electromagnet power supply. 5.2.5.9 Loosen the clamping screws of the upper and lower clamps to remove the broken fiber sample in the jaws. 5.2.5.10 According to the stop position of the passive pointer and the elongation scale, record the breaking strength and breaking elongation of the fiber. 5.2.5.11 Do 250 times for each sample. Record the fiber strength reading to one scale grid, and record the elongation reading to 0.1mm. 56
GB5886-—86
If the fiber slips in the jaws, or the fiber breaks within 1mm from the clamping point of the jaws, the data will be invalid and should be redone. Calculation method
6.1 Breaking strength and its standard deviation coefficient
In the formula, -
average breaking strength of the fiber, gf/d,
number of tests, times;
number of fiber counts, counts,
breaking strength of each fiber, gf/d,
weight of the hammer (100g), g,
-weight of the tension clamp (1g), g,
-reading of the strength scale, grid.
In the formula: CVn——standard deviation coefficient of breaking strength, %; standard deviation of breaking strength, gf/d.
6.2 Elongation at break and its standard deviation coefficient
Where: Sr-
-Elongation at break of each fiber, %,
hl--Elongation at break scale reading value, mms-Distance between upper and lower clamps (30mm), mm, Average elongation at break of fiber, %,
-Number of tests.
Where: CV.-
, s?-ns
Standard deviation coefficient of fiber elongation at break, %, Standard deviation of fiber elongation at break, %.
6.3 Rounding of numbers
(4)
:(6)
(7)
Numbers shall be rounded to the second decimal place. The rounding of numbers shall be carried out in accordance with the rules for rounding of numbers (supplementary) in Appendix C of GB1.1-81 "General Rules for the Preparation of Standards in the Guidelines for Standardization Work". 57
GB5886-86
Appendix A
(reference)
Other types of instruments that meet the technical requirements may also be used. Additional remarks:
This standard was proposed by the Ministry of Textile Industry of the People's Republic of China and is under the jurisdiction of the Standardization Research Institute of the Ministry of Textile Industry. This standard was drafted by the East China Textile Engineering Institute and was jointly drafted by Zhuzhou Ramie Textile Printing and Dyeing Factory and Shanghai No. 9 Cotton Textile Factory. The main drafters of this standard are Jiang Fanchang, Shao Kuan and Li Bicheng. 58
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