This standard is a test method for determining the breaking strength of ramie fiber (dry ramie and combed fiber) bundles. All tests during production, acceptance and delivery shall be conducted in accordance with this standard. GB 5882-1986 Test method for breaking strength of ramie bundles GB5882-1986 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Testing method of bundle breaking tenacity of ramie fiber
UDC 677.151. 014
GB 5882—86
This standard is the test method for determining the breaking tenacity of ramie fiber bundles (dry ramie and combed fiber). All tests 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 Ramie Physical and Chemical Properties Test". 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 the standard atmospheric conditions are not available, 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 clearly stated in the records and reports, and the data shall be corrected according to the standard conditions. 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
Strength testing machine
Technical parameters
Strength measurement range: 0~3000g, bZxz.net
Lower clamp descending stroke: 0~50mm,
Lower clamp descending speed: 4~25mm/ss
Upper and lower clamp distance adjustment range: 0~20mms Weight of heavy hammer: 3000g.
4.2 Weighing instrument
Precision torsion balance.
Technical parameters
Load range: 0~5mg,
Minimum division value: 0.01mg.
4.3, Fiber cutting tool
Fiber length cutter.
Technical parameters
Cutting length: 40mm.
4.4 Others
Flannel eraser,
Sparse comb: 8-10 needles/cm2
Published by the National Bureau of Standards on January 21, 1986
Reference model
Y162
Reference model
JN-A-5
Reference model
Y171.
1986-10-01 Implementation
Gauge: 10mm,
Stopwatch: 1/10s,
Glass plate: 8cm×15cm,
Tweezers: stainless steel, 12～15cm,
Black velvet plate: 15cm×25cm.
5 Test method
5.1 Preparation before test
GB 5882—86
5.1.1 Preparation of fine flax samples
Spread the samples on the table, cut off the folded part of the fine flax base, and then cut 10cm from the base. After mixing evenly and combing, randomly extract the fibers inside, with a total weight of about 2. 5.1.2 Preparation of combed fiber samples
Spread the samples on the table and randomly extract about 2g of fiber from different parts. 5.1.3 Pre-humidification of samples
Put the samples in a low-temperature drying oven at 40-50℃ for pre-drying for 1.5h, take them out and place them under standard atmospheric conditions for hygroscopic equilibrium for 24h, so that the moisture in the fibers reaches the standard equilibrium state. The results of the rapid test should be corrected.
5.1.4 Preparation of instruments
Adjust the instrument to the normal state, make the distance between the upper and lower clamps 10mm, and control the no-load descending speed of the lower clamp to 300mm/min.
5.2 Test steps
5.2.1 Arrangement of hemp bundles
Take out about 300 mg of fiber from the balanced sample, hold the fiber bundle with the thumb and index finger of the right hand, and then transfer one end of the fiber bundle to the holding point between the thumb and index finger of the left hand in a flat manner according to the length of the fiber. Repeat the transfer and arrangement twice with the left and right hands, and you can get a hemp bundle with long fibers arranged neatly at one end and short fibers at the top, with a width of 10 to 15 mm. 5.2.2 Combing
Use tweezers carefully to remove the strands and impurities in the hemp bundle, and use a sparse comb to gently comb and remove the free fibers in the hemp bundle. 5.2.3 Bundling
Put the combed hemp bundles together layer by layer on the glass plate according to the length of the fibers (discard the fibers of 6 cm and below), and then split them along the fiber length direction, a total of 12 to 13 bundles (only 10 bundles are used for the test). 5.2.4 Cutting
Place the hemp bundle flatly in the middle of the cutter clamp, and the hemp bundle should be perpendicular to the cutter. The neat end should be exposed for about 10mm, straighten the hemp bundle, and cut it.
Put the cut hemp bundles on a clean glass plate one by one, and press them with another glass plate. The remaining fibers at both ends of the cutter are reserved for the moisture regain test sample.
5.2.5 Weighing
Use tweezers to carefully remove the hemp bundles on the glass plate, weigh them one by one on a precision torsion balance (the cutting weight of each hemp bundle is about 1.5mg), and record them.
5.2.6 Stretching
a. Clamp the weighed small hemp bundle into the upper clamp about 10mm, then hang the upper clamp on the bracket of the bundle fiber strength tester, and clamp the other end of the hemp bundle into the lower clamp. When clamping, pay attention to keep the fibers straight and parallel. The width of the hemp bundle is about 2.5mm. b. Pull the handle of the bundle fiber strength tester, and the lower clamp begins to descend until the hemp bundle breaks, and record the breaking strength value. Return the small fan-shaped rod to zero, remove the upper clamp, loosen the clamping screw, and remove the fiber bundle inside it. Return the lower clamp to its original position, loosen the clamping screw, and take out the fiber bundle in the lower clamp for testing the fiber count d.
GB5882—86
This test is performed ten times in total. Each breaking strength value should be between 1700±500g. Those that exceed the tolerance or the number of unbroken fibers in each bundle exceeds two will be invalid and should be repeated.
6 Calculation method
6.1 Fiber bundle breaking strength
The ramie fiber bundle breaking strength is calculated according to formula (1): Pc
Where:
Where: Pc--fiber bundle breaking strength, g/dpr
Breaking strength of ramie bundle, g/d
-Breaking strength of ramie bundle, g,
Cutting weight of ramie bundle, mg,
Cutting length of ramie bundle, 40mm.
G.2 Standard deviation coefficient of fiber bundle breaking strength
The standard deviation coefficient of ramie fiber bundle breaking strength is calculated according to formula (3): CVr-1 =
Where: CV.-1-
Standard deviation coefficient of fiber bundle breaking strength. %,×100
-Standard deviation of fiber bundle breaking strength, g/d, 0n-1Calculated according to formula (4): Qn
-Number of tests (10 times).
Where: n
6.3Rounding of numbers
pi2 - nP?
（2）
（3）
（4）
The average breaking strength of fiber bundle and its standard deviation coefficient are retained to the second decimal place. The rounding of numbers shall be carried out in accordance with the digital rounding rules (supplement) in Appendix C of GB1.1-81 "General Provisions for the Preparation of Standards in the Guidelines for Standardization Work". 40
Test report of physical properties of ramie fiber
Laboratory
GB 5882--86
Appendix A
Tabular form
(reference)
Test report of physical properties of ramie fiber
(velvet)
Net count and count
Laboratory number
Number of pigs %
Temperature and humidity
A.2 Test record of strength and count of ramie fiber GB 5882 --86
Test record of ramie fiber strength and count
Sampling date
Cutting length
Bundle weight
Bundle breaking strength
Bundle breaking strength
pt, g/d
Test number
Number of fibers in bundle
Nmi, count
Average breaking strength of bundle fiber
Pe, g/d
Average fiber count
Nm, count
Actual moisture regain of fiber
Calculation formula
Specimen name
Dry bulb temperature,
Mixed bulb temperature,
gt·900
2(xx)3
A.3 Any other type of instrument that meets the technical requirements may also be used. 5
Laboratory No.
Relative humidity
Standard deviation coefficient of fracture
Standard deviation coefficient of count
Public moisture regain count
Nm, count
Additional remarks:
This standard is 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 and Shao Kuan.
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