China yarn network how to improve the intrinsic quality of yarn

1.First of all, we use high-quality raw materials to produce yarn. 2.

In the production process of every link to pay attention to, the proportion of the pre-spinning should be distinguished, to be fed according to the regulations. 3.In the production of pre-spinning, it is necessary to control the yarn dryness, and it is necessary to achieve the international advanced level of instrument data detection.

If you want a good yarn, pre-spinning is the key. If there is a problem in the front spinning, there is no way to do it well in the future. 4.

In the process of production, the draft should be reasonable, and the production should be carried out in accordance with the international advanced technology level, such as spacer blocks, wire hooks and other models must be standard. The front, middle and back spacing of the roller must be standard to prevent accidental drafting on the spinning yarn, and the strip must be evenly dry and the twist is moderate. Such a yarn is already controlled in the front middle.

In the later quality requirements, it is still quite important. 5.If it is a single yarn, it is necessary to pay attention to the production of the winder, which must use an electronic yarn clearer to control the strip of yarn, and all the coarse knots and details of the yarn must be disposed of, and the forming of the package yarn should be good, and there can be no climbing net yarn in front or behind, in this way, the yarn is of good quality and useless, and it cannot be produced normally in the use of the next knitwear.

6.If it is a double yarn, then we should also pay attention to the yarn problem of the stranding machine, and we must pay attention to prevent the appearance of a single strand yarn or a three-ply yarn when merging the strands, and the forming should be good, so that the production of the next process must have a modern machine to produce, strengthen the elimination of yarn defects, so that the single yarn will be broken immediately, and the yarn quality will be controlled. Later, there are two processes: double twisting machine and inverted twisting machine.

The twisting machine is to combine strands and twist the line. The inverted twisting machine is used to make the package yarn into a skein. Finally, it is necessary to go through the yarn inspection workshop to check whether the product is qualified, and finally become a high-quality yarn.

The selection of high-quality raw materials, fiber fineness and length of fiber, dyeing with environmentally friendly dyes, fastness and color good, there are many specific items.

The line factory has no profit margin, and the line is not up.

1) Weight deviation: refers to the percentage of weight difference between the density of the solid spinning thread and the density of the design thread. The commonly used assessment index is the weight deviation of 100 meters, which is generally controlled within the range.

2) Weight coefficient of variation: It is an indicator that indicates the uneven density of yarn threads. A commonly used assessment indicator is the coefficient of variation of 100-meter weight.

3) nep impurity particle number (g): under the specified conditions, the sample is wound on the blackboard, and under specific lighting conditions, the nep impurity number of the yarn wound on the blackboard is visually inspected, also known as the blackboard nep impurity number. The commonly used assessment indicator is the total number of neps or nep impurities in 1g of yarn.

4) Strip Uniformity: There are two ways to express the unevenness of the strip with blackboard visual inspection strip and capacitance detection strip dryness, the former is mainly used in the national standard evaluation and enterprises without capacitive strip stems; The latter is an internationally accepted indicator and can be found in the 2001 Uster Communiqué. 5) Coarse knots, details and neps:

Various types of strip dryers generally divide yarn defects into coarse knots, details and neps, and are converted into the number of yarns per kilometer when the test yarn length is not 1000m. Coarseness, details and nep assessment standards are beyond the range of **cup spinning 280) defects (high-grade customer standards can be tightened).

6) Single yarn breaking strength (strength), elongation at break and breaking work: use special instruments and equipment to stretch the sample until fracture, and record breaking strength and elongation at break at the same time, according to which the breaking strength and breaking work are calculated.

Routine testing: quality, content, tension, count of threads, defects, fracture (breaking strength and elongation at break of a single yarn), density (linear density, bulk density), strength, moisture content, oil content, twist, color fastness, etc.

You can try the textile steamer, the functions of the steamer are: 1 relaxation, shaping, humidification.

2. Increase the strength of the yarn and reduce the break (the breaking strength of cotton yarn will increase by 10, and the elongation at break of wool yarn will increase by 30);

3. The fine dust of cotton yarn hairy feathers decreased by 30-45;

4. The yarn humidity is uniform, and the moisture regain rate is controlled with high precision;

5. Eliminate static electricity and improve the effect of yarn unwinding;

6 Soft feel;

7. Improve the coloring effect;

8. Improve production efficiency and improve the overall quality of products.

Hello, the importance of yarn quality is reflected in:

Warp: The high-speed operation in the weaving process makes the warp yarn subject to severe wear and repeated stretching, and it has to withstand high-frequency inflection and friction, so the warp yarn must have enough single yarn strength and low single strength unevenness.

Weft: The weft yarn must also withstand high-frequency bending and friction, and the weak section of the weft yarn is easily blown off by the strong air flow of the weft insertion system. Therefore, the quality of the yarn is very important in the weaving process.

Definitely has an impact!

Twisting is to cause the two sections of the yarn to rotate relative to each other, when the fibers in the yarn sliver that were originally parallel to the yarn shaft are tilted into a helix. For staple fibers, twisting is mainly used to improve the strength of the yarn. The twisting of filament can not only improve the strength of the yarn, but also produce a certain effect.

The amount of yarn twisting and the twist direction and twist degree of the yarn in the fabric have a great impact on the appearance and performance of the product.

The indicators of twisting properties are: twist degree indicating the degree of twisting, twisting coefficient and twisting direction indicating twisting direction.

Twist. The yarn twist angle is twisted into a twist. The number of twists in a unit length of yarn is called twist. China's cotton yarn adopts a special twist, that is, 10

Indication of the number of twists within the length of the yarn in cm; Combed wool yarn and chemical fiber filament are twisted using the metric count system, that is, expressed by the number of twists per meter; In addition, there is also the imperial count twist expressed by the number of twists per inch.

Twist factor. Twist cannot be used to compare the degree of twisting of different yarns of different thicknesses, because the fiber tilt of the coarse yarn is greater than that of the thin yarn with the same twist. In actual production, the twist coefficient is often used to indicate the degree of twisting of the yarn.

The twist factor is a relative value that indicates the degree of twisting of the yarn in combination with the thread density, and can be used to compare the degree of twisting of different yarns of different thicknesses. The twist coefficient can be calculated according to the twist of the yarn and the density of the yarn.

Twist direction. Twist direction refers to the direction of inclination of the fibers in the single yarn or the single yarn in the strands after the yarn is twisted. It is divided into two types: Z twist and S twist.

After twisting, the twist direction of the yarn is inclined from the lower right corner to the upper left corner, and the inclined direction is consistent with the middle of the "S" called S twist or smooth twisting; The twist direction of the yarn is inclined from the lower left corner to the upper right corner, and the inclined square slag direction is consistent with the middle of the "z", which is called z twist or backhand twist. Generally, single yarn often uses Z twist, and strand uses S twist.

The twist direction of the strands is expressed according to the twist direction of the successive twists. For example, the twist direction of a single yarn is Z twist, the initial twist is S twist, and the double twist is Z twist.

The twist direction of the yarn has a great impact on the appearance and feel of the fabric, and the twist direction of the warp and weft yarn can be combined with the fabric structure to weave fabrics with different styles such as appearance and feel.