How To Check The Quality Of Different Cotton

Frost yellow cotton

It is due to the influence of frost on the growth and development of cotton.

The color of frost yellow cotton is related to the maturity of fiber and the severity and frequency of frost damage.

If the fiber has been basically mature and dehydrated, the fiber will be yellowish, yellowish or dark red after frost damage.

In general, the deeper the color of yellow cotton is, the worse the quality is. The yellow cotton is also dark in color and strong in strength, lighter in color and poorer in strength.

In testing, we should understand the internal quality according to the yellow cotton standard and use the value to grade.

If there is no yellow cotton standard, it can be classified according to the internal quality and color level of Huang Mian, generally considered in the four to seven levels.

Such as cotton color yellowish, and a small amount of late white cotton, maturity is good, strong, can be rated as four, the color is pure yellow, maturity is slightly worse, strong general, the surface is slightly bad, can be classified as five, the color is reddish brown, low strength, and pollution.

There are grains of cashmere, which can be classified as grade six; the color is reddish brown, the strength is particularly low, the pollution is more, and the number of grains is more. It can be classified as grade seven. When examining, the hand touches the raw cotton, the hand draws the cotton layer adhesion, the various pollution fibers are mixed, the light piece and the pile down are serious, this kind of cotton has no use value.

Adulterated cotton

Cotton blended with two or three types of cotton lint is dark and finely colored with short velvet blocks.

Cotton blended with recycled cotton is much more numerous and darker.

When the length of the above hand is pulled, the staple fiber content is higher and the length uniformity is worse.

Cotton blended with bleached cotton is dark green and white.

Fiber strength is very poor, with pungent chemical smell.

Cotton blended with chemical fiber is white in color and can feel good elasticity when pulling out the length.

Cotton with combed noil is less impurity, white and short.

For adulterated and adulterated cotton, it is best not to fill in the grade on the certificate of inspection. It also specifies the amount of the material contained in the cotton, the substance mixed with it, and the adulteration.

The proportion of cotton samples and so on.

If the content is small and does not affect normal use, it should fill in the grade and indicate what kind of substance it contains, how much and how much it is in the remarks.

Chen Mian

The test should be based on maturity, and according to its variation and color depth and combined use value.

The storage cotton is stored in high-grade cotton. The raw cotton contains no grains. The color of the raw cotton is yellow, but the fiber quality is good.

The depth of fiber is affected by the length of cotton stock and the storage conditions and the grade of raw cotton.

When inspecting grades, you must not "cut the same size" according to the test of yellow cotton, and should be tested according to actual conditions.

For Chen cotton with less color change, better maturity and stronger strength, the test can be higher than grade four.

For example, the degree of maturity is equivalent to grade two, and the color is equivalent to grade four, with mercerizing and good strength. The average rolling mill should be three.

For cotton with obvious yellow color, they should be treated with yellow cotton. Most of the cotton ranks between grade four or five. Grade six or seven basically does not exist.

For burned cotton, water soaked cotton, cotton and oily cotton and other cotton, we should consider its use value according to the standard and determine the grade.

Cotton, oily cotton, cotton and heavier water stains are generally not suitable for weaving.

Water less light cotton fiber mainly takes into account the strength, such as the strength has little effect, and has the use value. It can be checked according to the normal cotton grade, but it should be stored separately and marked.

In short.

The inspection should be based on the characteristics of cotton samples and the grading should be considered according to the grading conditions.