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This standard is a testing method for determining the breaking tenacity of ramie single fiber. Upon any requests for inspection during production, acceptance and delivery, test shall be carried out according to this standard.
This standard was proposed by the Ministry of Textile of the People's Republic of China and is under the jurisdiction of Standardization Research Institute of the Ministry of Textile Industry.
Testing method of single fiber breaking tenacity of ramie
1 Sampling
It shall be carried out in accordance with GB 5881-86 Sampling method of physical and chemical properties of ramie fiber.
2 Test conditions
2.1 The test shall be carried out under standard atmospheric conditions. The standard atmospheric conditions of the laboratory are: temperature of 20 ± 3°C and relative humidity of 65 ± 5%.
2.2 If these conditions are not available, the test may be carried out 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 statements, and the data shall be corrected according to the standard conditions.
2.3 Tap water shall be available, the water shall be clear and clean with stable pressure, otherwise, filtering and pressure stabilization measures shall be taken. The water pressure at the inlet pipe of single fiber strength tester shall be stable within the range of 1.0 ± 0.1kgf/cm2.
3 Period of test
Periodic test may be carried out as required. Each variety of product shall be tested at least once a day. The test period for acceptance and delivery shall be agreed by both parties.
4 Test apparatus
4.1 Strength tester
Single fiber strength tester.
Technical parameter Reference model
Strength test range: 1 ~ 100g; Y161
Lowering speed of lower clamp: 0 ~ 20cm/min;
Extension indication range: 0 ~ 25mm;
The maximum descending stroke of the lower clamp: 44mm;
Distance between the upper and lower clamps: 10, 20, 10, 20, 30 ~ 100mm
4.2 Others
a. Small brush;
b. Thin comb: 8 ~ 10needles/cm;
c. Stopwatch: 1/10s;
d. Glass plate: 9cm × 15cm;
e. Tweezers: stainless steel, 12 ~ 15cm;
f. Black velvet board: 15cm × 25cm;
g. Common scissors
5 Testing methods
5.1 Preparation before test
5.1.1 Preparation of degummed ramie sample
Lay the prepared samples on the test bench separately, cut them from the folded parts of degummed ramie base and tip, then cut 10cm from the base, mix them evenly, comb them, and randomly extract the fibers in them, with a total weight of about 2g.
5.1.2 Preparation of combed fiber sample
Lay the prepared samples on the test bench, and randomly select fibers with a total weight of about 2g from different parts.
5.1.3 Pre-conditioning treatment of sample
Put the prepared sample in a low-temperature drying oven at 40 ~ 50°C, pre-bake for 1.5h, take it out and put it in the standard atmosphere for moisture absorption and balance for 24h, so that the moisture in the fiber can reach the standard equilibrium state.
The results of the rapid test shall be revised.
5.1.4 Preparation of apparatus
Adjust the apparatus to the normal state so that the distance between the upper and lower clamps is 30mm, and control the descending speed of the lower clamp so that the time to break each fiber is 20 ± 3s.
5.2 Test procedure
5.2.1 Fiber bundle arrangement
Take out about 300mg of fiber from the balanced sample, first hold the fiber bundle with the thumb and forefinger of the right hand, and then gradually transfer one end to the holding point between the thumb and forefinger of the left hand in the order of fiber length, so that the fiber bundle with long fiber in the bottom and short fiber in the top and width of about 10 ~ 15mm may be achieved by repeated transfer and arrangement of the left and right hands twice.
Foreword i
1 Sampling
2 Test conditions
3 Period of test
4 Test apparatus
5 Testing methods
6 Calculation method
Annex A (Informative)
