Some standard content:
National Standard of the People's Republic of China
Topic Content and Scope of Application
Flax fiber
Sisal fiber
GB/T 15031--94
This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, transportation, storage and other requirements for sisal fiber. This standard applies to fibers extracted from sisal leaves. 2 Technical requirements
2.1 Physical indicators
2.1.1 The physical indicators of the fiber shall comply with Table 1. 2.1.2 The moisture regain of the fiber shall not exceed 13%. Table 1 Physical indicators
Length, cm
Bundle fiber strength, N
Impurity rate, %
2.2 Appearance quality
Superior quality
2.2.1 There shall be no dry skin, knotted fiber, or moldy fiber in the fiber. 2.2.2 The appearance quality of the fiber shall comply with Table 2. Table 2 Appearance index
Superior quality
White, milky white, glossy
First quality
≥830
White, floating white
Evaluation of appearance items of various grades of fibers can refer to the standard samples recognized by both the supply and demand parties. 3 Test method
3.1 Length test
3.1.1 Principle
Measure and calculate the weight-weighted average length of the sample under specified conditions. 3.1.2 Test conditionswww.bzxz.net
Approved by the State Administration of Technical Supervision on April 12, 1994 178
Qualified quality
≥780
Qualified quality
Light yellow or yellow-brown
Implemented on October 1, 1994
Carried out under ambient atmospheric conditions.
3.1.3 Test instruments
3.1.3.1 Balance: sensitivity 0.1g.
3.1.3.2 Steel ruler: scale 1mm.
3.1.4 Sampling
GB/T 15031—94
Randomly select fibers weighing about 1000g from the middle of the sample bag as a sample. This sample can be used for appearance quality assessment and then for length test.
3.1.5 Test procedures
3.1.5.1 Divide the samples into several groups according to the length of the hemp bundle, with a group spacing of 5cm. 3.1.5.2 Straighten each group of fibers, align the bases, and lay them flat on the platform in order of length. 3.1.5.3 Weigh each group of fibers. Weigh to an accuracy of 0.1g. 3.1.6 Calculation and Expression
3.1.6.1 Fiber Length
The fiber length of the sample is calculated according to formula (1):
Where: L—--average length of the sample fiber, cm, W;--weight of the i-th group of fibers, g;
L;--median value of the i-th group of fiber length, cm. The calculated value is the test value of the sample fiber length. 3.1.6.2 Length Qualification Rate
The length qualification rate of the sample is calculated according to formula (2):
Where: B—length qualification rate, %;
Z(W,L)
× 100
W—weight of the group of fibers whose length is greater than or equal to the index of this grade, g; w—weight of each group of fibers, g. The calculated value is the test value of the length qualification rate of the sample. 3.1.6.3 Length of a batch of fibers
The length of the whole batch of fibers is expressed as the arithmetic mean of the test values of the length of all the test samples. The calculation is accurate to an integer. 3.1.6.4 Length pass rate of a batch of fibers
The length pass rate of a whole batch of fibers is expressed as the arithmetic mean of the test values of the length pass rate of all the test samples. The calculation is accurate to an integer. 3.2 Strength test of bundle fibers
3.2.1 Principle
Under specified conditions, a bundle of fibers with a length of 300 mm and a weight of 1 g is stretched to break. 3.2.2 Test conditions
3.2.2.1 The test is carried out under ambient atmospheric conditions. 3.2.2.2 The arbitration test shall be carried out under standard atmospheric conditions for textile conditioning and testing at a temperature of 20±2°C and a relative humidity of 65%±3%.
3.2.3 Test equipment
GB/T 15031—94
3.2.3.1 Strength test machine: maximum load 1200~～2500N, tensile speed can reach 300±20mm/min, and can test samples with a length of 300mm.
3.2.3.2 Balance: sensitivity 0.01g.
3.2.3.3 Steel ruler: scale 1mm, length not less than 30cm. 3.2.3.4 Scissors.
3.2.4 Sample preparation
3.2.4.1 Randomly select about 100g of fiber from the middle of the sample package as a sample. 3.2.4.2 Straighten the sample, align the base, and take a bundle of fibers with a middle length of 300mm. The length measurement should be accurate to 1mm. 3.2.4.3 Hold the fiber bundle at one end and shake off impurities and fiber bundles shorter than 300 mm. The length measurement should be accurate to 1 mm. 3.2.4.4 During the arbitration test, the arranged fiber bundle should be placed under the conditions specified in 3.2.2.2 for at least 24 hours. 3.2.4.5 Weigh more than 10 samples weighing 1 g. Weigh to an accuracy of 0.01 g. 3.2.5 Test procedure
3.2.5.1 Adjust the tensile speed of the strength tester to 300 ± 20 mm/min; select an appropriate load level so that the fiber strength reading is 25% to 75% of the maximum reading of the level.
3.2.5.2 Stretch the sample straight and clamp it between the upper and lower clamps with a clamp spacing of 200 ± 10 mm. 3.2.5.3 Start the strength tester and lower the lower clamp until the sample breaks, and record the breaking strength value. The strength reading is accurate to 15N. If the sample breaks at the clamp or the sample slips, the test is invalid. 3.2.5.4 Valid tests are 10 times.
3.2.6 Calculation and expression
Each valid reading of the strength test is the test value of the sample. The strength of the whole batch of fibers is expressed as the arithmetic mean of all valid test values. The value is accurate to an integer and the unit is Newton.
3.3 Impurity content test
3.3.1 Principle
Remove impurities from the sample under specified conditions and calculate the number of grams of impurities contained in every 100g of the sample. 3.3.2 Test conditions
According to the provisions of Article 3.2.2.
3.3.3 Test instrument
3.3.3.1 Balance: sensitivity 0.01g.
3.3.3.2 Needle comb: tapered needles, 2 needles/cm. 3.3.3.3.3 Scissors.
3.3.4 Sample preparation
3.3.4.1 Randomly select about 100g of fiber from the middle of the sample bag as a sample. Care should be taken to prevent the loss of impurities when sampling. 3.3.5 Test procedure
3.3.5.1 Cut off the diseased spots, dry skin, green skin and seriously degummed and unclean fibers of the sample. 3.3.5.2 Comb the sample with a needle-tooth comb, and remove the hemp scraps by rubbing, loosening, shaking, etc., and weigh the fiber. Then, remove the hemp scraps repeatedly according to the above method, and weigh the fiber until the difference between the previous and the next two weights is less than 0.5g. The subsequent weight is the weight of the sample after removing all impurities. Weigh to an accuracy of 0.1g.
3.3.5.3 During the process of removing impurities, care should be taken to prevent the loss of impurities. 3.3.5.4 Collect and weigh the impurities removed from the sample (including hemp scraps, disease spots, dry skin, green skin and seriously degummed and unclean fibers). Weigh accurately to 0.1g.
3.3.6 Calculation and expression
3.3.6.1 The impurity content of the sample is calculated according to formula (3): 180
Where; 7 Impurity content, %;
H—-weight of the sample after removing impurities, g; Z. Weight of impurities. g.
The calculated value is the test value of the impurity content of the sample. GB/T 15031-- 94
3.3.6.2 The impurity content of the entire batch of fibers is expressed as the arithmetic mean of the test values of all samples. The value is accurate to one decimal place. 3.4 Moisture regain and moisture content test
3.4.1 Principle
Under specified conditions, remove moisture from the sample and calculate the grams of moisture contained in every 100g of the sample. 3.4.2 Test conditions
Carry out in ambient atmosphere.
3.4.3 Test apparatus
: (3)
Eight-basket constant temperature drying oven: with good air circulation device. The temperature can be controlled within the range of 105-110℃, and the balance accuracy is 0.01g. 3.4.4 Sampling
Randomly select 7 fibers of about 10g from different parts of the middle of the sample bag as a sample, and quickly put them into a plastic bag and seal them. 3.4.5 Test procedure
3.4.5.1 Take the sample out of the plastic bag, quickly shake off the hemp scraps, and quickly weigh and record it in the hanging basket in the drying oven. This weight is the wet weight of the sample. Weigh to the nearest 0.1g. 3.4.5.2 After drying at 105~110℃ for 1.5h, weigh it and weigh it every 20min thereafter until the difference between the two weights is within 0.1g. The last weight is the dry weight of the sample. Weigh to the nearest 0.1g. 3.4.6 Calculation and Expression
3.4.6.1 The moisture regain of the sample is calculated according to formula (4); the moisture content is calculated according to formula (5): SG
Where: H. Moisture regain, %,
H.--Moisture content, %;
S--Wet weight of the sample, g;
G--Dry weight of the sample, g.
The calculated value is the test value of the moisture regain or moisture content of the sample. .(4)
3.4.6.2 The moisture regain or moisture content of the whole batch of fibers is expressed as the arithmetic mean of all test values. The value is accurate to one decimal place. 4 Inspection rules
4.1 Factory inspection
4.1.1 The fiber shall be inspected according to all items specified in Chapter 2 of this standard before leaving the factory. 4.1.2 For sampling of factory inspection, sample packages shall be randomly selected from the fiber packages of the same batch and the same grade, and the number of fiber packages in a batch shall not exceed 200 packages. The number of randomly selected fiber packages is shown in Table 3.
Number of fiber packages in a batch
Number of sampling packages
GB/T 15031--94
4.1.3 The fiber shall be accompanied by an inspection report before leaving the factory. The inspection report shall include the product name, quantity and inspection results of the inspection items, the assessed grade, the inspection unit, the inspector, the test conditions, date, etc. 4.2 Quality Assessment
4.2.1 Length Quality Assessment
The length of each grade of fiber shall meet the following requirements:
The length of the entire batch of fibers shall not be less than the standard of this grade; a.
The qualified rate of the length of the entire batch of fibers shall be greater than or equal to 85%. h.
If any one of the above is not met, the length of the batch of fibers shall not meet the standard of the fiber length of this grade. 4.2.2 If one of the three physical indicators of fiber length, bundle fiber strength and impurity content fails to meet the standard of this grade, it shall be downgraded to the next grade.
4.2.3 If one of the indicators of the appearance quality of the fiber is lower than the standard of the next grade or two indicators are lower than the standard of this grade, it shall be downgraded to the next grade. 4.3 Weight Acceptance
4.3.1 The standard moisture regain of the fiber is 13%.
4.3.2 The weight of the batch of fibers shall be calculated and accepted according to the nominal weight of the fiber package and the number of fiber packages. 4.3.3 If the relevant parties have objections to the fiber weight, they may jointly sample, measure the moisture regain and the actual weight of the fiber package, and calculate the fiber package weight. 4.3.4 The fiber package weight is calculated according to formula (6): z,
wherein Z,-——common weight, kg;
z. Actual weight of the fiber package, kg;
Hu—-common moisture regain, %
H.——-actual moisture regain,%.
z,(1 + H)
The calculated value is the fiber package weight value. The common weight of each package of the entire batch of fiber packages is expressed as the average value of the common weight of all sample packages. The value is accurate to one decimal place.
4.3.5 If the fiber weight complies with Article 5.1.2, the weight of the whole batch of fibers shall be calculated according to the nominal weight of each fiber package and the number of fiber packages; if the fiber weight does not comply with Article 5.1.2, the weight of the whole batch of fibers shall be calculated according to the nominal weight of each fiber package and the number of fiber packages. 4.4 Re-inspection
4.4.1 If the relevant parties have objections to the product quality, they may conduct sampling inspection and make judgments based on the re-inspection results. If a certain item does not meet the indicators of this standard, the supplier may be allowed to rework and then conduct re-inspection and evaluation. The re-inspection shall prevail. 4.4.2 All expenses in the re-inspection shall be borne by the responsible party. 5 Packaging, marking, transportation and storage
5.1 Packaging
5.1.1 Each fiber package shall be composed of fibers of the same variety and grade. When packaging, the fiber base and tip shall be clearly separated and straightened and neat. 5.1.2 The net weight of each fiber package is 100kg, not less than 99.5kg. 5.1.3 The size and volume of the fiber package are shown in Table 4. 182
Length, cm
Width, cm
Height, cm
Volume, m2
GB/T15031—94
5.1.4 Tie with galvanized iron wire or strapping tape, at least eight ties per package. 5.2 Marking
130~135
0.202~0.253
Each fiber package should be attached with a label, which should be pressed under the strapping wire. The label should indicate the product name, trademark, grade, net weight, production unit, production unit address, production date and product qualification mark. 5.3 Transportation
The carriages and cabins for transporting fibers must be clean and must not be mixed with flammable, explosive and corrosive items. Prevent the fibers from getting damp and contaminated. Strictly prevent fire.
5.4 Storage
5.4.1 Fibers shall not be stored in the open air or together with flammable, explosive or corrosive materials. 5.4.2 Fibers shall be stored on the dunnage in the warehouse according to their grade. The warehouse shall be kept clean, dry and well ventilated. Fibers shall be protected from moisture and fire prevention shall be strictly enforced.
Additional Notes:
This standard was proposed by the China Fiber Inspection Bureau and the Ministry of Agriculture. This standard was drafted by the Guangdong Province Western Guangdong Agricultural Bureau. The main drafters of this standard are Zheng Wanchun, Chen Tongxian and Zhu Tianli. 1832 The net weight of each fiber package is 100kg, not less than 99.5kg. 5.1.3 The size and volume of the fiber package are shown in Table 4. 182
Length, cm
Width, cm
Height, cm
Volume, m2
GB/T15031—94
5.1.4 Tie with galvanized iron wire or strapping tape, at least eight ties per package. 5.2 Marking
130~135
0.202~0.253
Each fiber package should be attached with a label, which should be pressed under the strapping tape. The label should indicate the product name, trademark, grade, net weight, production unit, production unit address, production date and product qualification mark. 5.3 Transportation
Carriages and cabins for transporting fiber must be clean and must not be mixed with flammable, explosive and corrosive materials. Prevent the fiber from getting damp and contamination. Strictly prevent fire.
5.4 Storage
5.4.1 Fibers must not be piled in the open air and must not be piled with flammable, explosive and corrosive materials. 5.4.2 Fibers should be piled on the dunnage in the warehouse according to their grade. The warehouse should be kept clean, dry and well ventilated. Prevent the fiber from getting damp and strictly prevent fire.
Additional remarks:
This standard was proposed by the China Fiber Inspection Bureau and the Ministry of Agriculture. This standard was drafted by the Guangdong Western Yue Agricultural Bureau. The main drafters of this standard are Zheng Wanchun, Chen Tongxian and Zhu Tianli. 1832 The net weight of each fiber package is 100kg, not less than 99.5kg. 5.1.3 The size and volume of the fiber package are shown in Table 4. 182
Length, cm
Width, cm
Height, cm
Volume, m2
GB/T15031—94
5.1.4 Tie with galvanized iron wire or strapping tape, at least eight ties per package. 5.2 Marking
130~135
0.202~0.253
Each fiber package should be attached with a label, which should be pressed under the strapping tape. The label should indicate the product name, trademark, grade, net weight, production unit, production unit address, production date and product qualification mark. 5.3 Transportation
Carriages and cabins for transporting fiber must be clean and must not be mixed with flammable, explosive and corrosive materials. Prevent the fiber from getting damp and contamination. Strictly prevent fire.
5.4 Storage
5.4.1 Fibers must not be piled in the open air and must not be piled with flammable, explosive and corrosive materials. 5.4.2 Fibers should be piled on the dunnage in the warehouse according to their grade. The warehouse should be kept clean, dry and well ventilated. Prevent the fiber from getting damp and strictly prevent fire.
Additional remarks:
This standard was proposed by the China Fiber Inspection Bureau and the Ministry of Agriculture. This standard was drafted by the Guangdong Western Yue Agricultural Bureau. The main drafters of this standard are Zheng Wanchun, Chen Tongxian and Zhu Tianli. 183
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