GB/T 21977-2022Camel hair (English PDF)

3.1 Camel hair

Fluff fibers produced from camels.

NOTE: It includes raw camel hair, scoured camel hair and dehaired camel hair, of which the fibers with a diameter of 40 µm or less are considered to be down fibers.

3.2 Raw camel hair

Unprocessed camel hair fibers that naturally fall off from camels and are collected.

3.3 Scoured camel hair

Camel hair obtained from raw camel hair after being scoured to meet certain quality requirements.

3.4 Dehaired camel hair

Camel hair that has been scoured and industrially dehaired to remove a large amount of coarse hair and foreign matters.

3.5 Coarse camel hair

Fibers with a diameter of more than 40 µm in camel hair.

3.6 Heterotypical camel hair

Fibers with a diameter of 40 µm or less at one end and a diameter of more than 40 µm at the other end in camel hair fibers.

NOTE: Fibers with a diameter of 40 µm or less at one end and a length exceeding half of the total length of the fiber are regarded as down hair (fiber).

3.7 Mane on upper legs, neck-to-chin and shoulders

Coarse and long hair fibers collected from the upper legs, upper and lower edges of the neck and the peak of camels.

3.8 Coarse camel hair content

Percentage of the mass of fibers with a diameter greater than 40 µm (including heterotypical camel hair with a diameter greater than 40 µm at one end and a length greater than half of the total fiber length) in dehaired camel hair to the total mass.

3.9 Foreign content

Percentage of the mass of dandruff, soil, sand, plant matter and other foreign matters picked out by physical methods to the total mass of camel hair samples.

3.10 Short camel hair content

Percentage of the mass of fibers with a length of 20 mm in scoured camel hair to the total number of fibers.

3.11 Yield

Percentage of the conditioned weight of raw camel hair after scouring to the mass of raw camel hair.

3.12 Pure camel hair content

Percentage of the mass of raw camel hair after scouring, drying and removing coarse hair and foreign matters, or the mass of scoured camel hair after removing coarse hair and foreign matters and corrected by the conventional moisture regains and conventional oil content, to the mass of raw camel hair/scoured camel hair.

4.1 Raw camel hair

4.1.1 See Table 1 for the requirements for technical indicators of raw camel hair.

5.1.5 Pure camel hair content of raw camel hair

5.1.5.1 From the sample that have dried to absolute dry mass after the yield test, quickly and randomly select 3 portions of pure camel hair content specimens at multiple points, each weighing about 5 g, recorded as mw, to the nearest 0.01 g, of which 2 portions are used for parallel tests and 1 portion is a reserve specimen. Use tweezers to pick out coarse camel hair (including heterotypical camel hair) and foreign matters in the specimens to obtain pure camel hair, dry the pure camel hair to absolute dryness, weigh the absolute dry mass of the pure camel hair, recorded as mp, to the nearest 0.0001 g.

5.1.5.2 The pure camel hair content of raw camel hair is calculated according to formula (4). where:

B - the pure camel hair content of raw camel hair, %; mp - the absolute dry mass of pure camel hair, in grams (g);

Je - the measured oil content of pure camel hair, %;

JP - the conventional oil content of dehaired camel cashmere (JP = 1.0), %; mw - the mass of the specimen of scoured camel hair, in grams (g); Y - the yield of raw camel hair, %.

5.1.5.3 The average value of the pure camel hair contents of the 2 portions of specimens is taken as the test result. When the absolute difference between the 2 portions of specimens exceeds 3 %, a third portion of specimen shall be tested, and the average value of the 3 portions of specimens is taken as the final result. The calculated result is rounded off to two decimal places.

5.2 Test methods for scoured camel hair

5.2.1 Test method for pure camel hair content of scoured camel hair

5.2.1.1 Randomly take 3 portions of scoured camel hair samples at multiple points, about 5 g per portion, to the nearest 0.01 g, of which 2 portions are used for parallel tests and 1 portion is a reserve specimen. Use tweezers to pick out coarse camel hair (including heterotypical camel hair) and foreign matters in the specimens to obtain pure camel hair, dry the pure camel hair to absolute dryness, weigh the absolute dry mass of the pure camel hair, to the nearest 0.0001 g.

5.2.1.2 The pure camel hair content of scoured camel hair is calculated according to formula (5). where:

A - the pure camel hair content of scoured camel hair, %; mp - the absolute dry mass of pure camel hair, in grams (g);

Je - the measured oil content of pure camel hair, %;

RP - the conventional moisture regains of dehaired camel hair (RP = 15), %;

JP - the conventional oil content of dehaired camel hair (JP = 1.0), %; mw - the mass of the specimen of scoured camel hair, in grams (g).

5.2.1.3 The average value of the 2 portions of specimens is taken as the test result. When the absolute difference between the 2 portions of specimens exceeds 3 %, a third portion of specimen shall be tested, and the average value of the 3 portions of specimens is taken as the final result. The calculation result is rounded off to two decimal places.

5.2.2 Average length and short camel hair content

5.2.2.1 Specimen preparation. After the sample is fully mixed, randomly extract fibers from multiple points on the front and back sides, mix them thoroughly and divide them into 3 portions, of which 2 portions are used for parallel tests and 1 portion is a reserve specimen.

5.2.2.2 Arrangement of diagram. Arrange the extracted fiber specimens into a small hair bundle with one end flat, hold the flat end of the small hair bundle with one hand, stick the other end to the fiber board and press the end with the thumb of the other hand, pull the fibers out of the hair bundle from long to short and arrange them on the fiber board from long to short, and evenly arrange the fiber specimens into a length distribution diagram with a bottom length of 250 mm ± 10 mm and uniform fiber distribution, as shown in Figure 1.

5.2.3 Average diameter

According to 5.1.2.

5.2.4 Oil content

According to GB/T 6977.

5.3 Test methods for dehaired camel hair

5.3.1 Average diameter

According to 5.1.2.

5.3.2 Average length

According to 5.2.2.

5.3.3 Oil content

According to GB/T 6977.

5.3.4 Moisture regains

According to GB/T 6500.

5.3.5 Coarse camel hair content and foreign content

5.3.5.1 Specimen weighing and testing

Take 3 portions of specimens, each weighing about 5 g, of which 2 portions are test specimens and 1 portion is a reserve specimen, to the nearest 0.01 g. Place the specimens on a fiber board with a large color contrast with the tested fiber, use tweezers to pick out the coarse hair (including heterotypical camel hair) and foreign matters (including dandruff), and weigh them separately, to the nearest 0.0001 g.

5.3.5.2 Calculation of coarse camel hair content

The coarse camel hair content is calculated according to formula (10). where:

BBC - the coarse camel hair content, %; mc - the mass of coarse camel hair (including heterotypical camel hair), in grams (g); m - the mass of the specimen, in grams (g).

5.3.5.3 Calculation of foreign content

The foreign content is calculated according to formula (11). where:

Baz - the foreign content, %; ms - the mass of foreign matters, in grams (g); m - the mass of the specimen, in grams (g).

5.4 Conditioned weight test

5.4.1 The conditioned weight of pure camel hair of raw camel hair is calculated according to formula (12). where: mg - the conditioned weight of pure camel hair of raw camel hair, in kilograms (kg);

MN - the total net weight of raw camel hair in the inspection batch, in kilograms (kg);

B - the pure camel hair content of raw camel hair, %.

5.4.2 The conditioned weight of pure camel hair of scoured camel hair is calculated according to formula (13). where: mx - the conditioned weight of pure camel hair of scoured camel hair, in kilograms (kg); mj - the net weight of scoured camel hair in the inspection batch, in kilograms (kg);

A - the pure camel hair content of scoured camel hair, %.

5.4.3 The conditioned weight of dehaired camel hair is calculated according to formula (14).

8.1 Packaging

Packaging shall be easy to manage, store and transport, and ensure that its quality is not affected. Packaging materials shall be ventilated, breathable and moisture-proof, and avoid mixing of foreign fibers. The standard weight of each package of dehaired camel hair is 75 kg ± 5 kg, and the overall dimensions are 800 mm × 600 mm × 400 mm. If the purchaser has special requirements, the supplier and purchaser shall negotiate on their own.

8.2 Marking

8.2.1 Each package of camel hair shall be marked. The handwriting of the mark shall be eye-catching, clear and durable.

8.2.2 The mark of camel hair includes the following contents. product name, origin, grade, gross weight, net weight, package number and delivery unit.

8.2.3 The mark of scoured camel hair includes the following contents. product name, batch number, model, gross weight, net weight, package number and delivery unit.

8.2.4 The mark of dehaired camel hair includes the following contents. product name, batch number, grade, gross weight, net weight, package number and delivery unit.

8.3 Storage

8.3.1 Camel hair shall be stored in a dry and ventilated warehouse. The hair packages shall not be in direct contact with the ground and shall not be contaminated. […]