150D / 3 Combed Cotton Spinning Filament Embroidery Thread

Product Name:

polyester embroidery thread

Characteristics:

Polyester embroidery thread is made of polyester filament. The thread is of good glossy effect, low friction, uniform twist, low breakage and low chromatic aberration.

Product types: 108D/2, 120D/2, 150D/2, 150D/3.

Based on the combination of the design mechanism features of the FA261 series and F1268 series combers produced by warp and weft, and the spinning technology through theory and production practice, some methods to reduce neps and improve the quality index of combed yarn in the combing process are summarized.

With the accession to the WTO, the international market has increasingly demanded the quality of China's textile products. Moreover, combed products are one of the key conditions for adjusting the structure of China ’s cotton spinning products and improving economic benefits. Therefore, the market demand for combed yarns, especially high-count combed yarns, will increase. A key technical indicator, it directly affects the strength of the yarn, the quality of the shaft, and the appearance of the grey fabric. Based on the design characteristics of FA261 and F1268 series combers and practice, the aspects of neps generation and how to reduce them are discussed.

Neps

Neps are yellow, white, round, flat, or large or small fine particles formed by the improper handling of fibers, immature cotton, or stiff cotton during ginning or spinning, also known as white stars. The causes of neps in the combing process are relatively complicated, and are analyzed from the following aspects.

Combing preparation process

In the combing preparation process, due to the improper draw multiple and draw interval, the number of transpositions of the front and rear hooks is increased, and small neps are liable to occur. In addition, the process of slivers or cotton rolls has more contact with the table top, and the operation method of the blocker is also one of the main factors that produce neps. Generally, the skein after passing the sliver is increased by about 20%, and the impurities are reduced by about 8%.

Combing process

The combing machine cylinder, while combing away a part of the neps, also combed the large neps into small neps, that is, the neps were reduced in quality, but not in quantity. And due to many reasons such as the top comb and the cylinder, the combing effect of the comber is not fully exerted.

Drafting part

Each time the sliver and web pass through the draft between the top roller and the roller, some neps will be generated.

Neps control

The control of neps is a comprehensive control, which is related to the operation methods of cotton distribution, temperature and humidity, equipment, and stopper and the type of spinning. It is impossible or unrealistic to achieve a "value" for neps , Can only be equal to the number of neps in the card, or float up and down. Doing a good job in equipment management and improving the preparation process; strengthening the combing ability of combing cylinders and top combs; rational arrangement of cotton feed and noil rate have a very important role in controlling the number of neps.

Influence and Control of Combing Preparation Process on Neps

The main task of the combing preparation process is to make small rolls with good appearance, large packages, non-stick rolls, uniform length and width, and small weight differences. The next step of the combing preparation process is a combing machine with very high carding efficiency, so the preparation process can only be appropriate to improve the "three degrees" (straightness, parallelism, separation) of the fibers in the sliver. Not as much as possible. Therefore, the requirements for the sliver winding, the combined number of slivers, and the roller spacing should be based on the comber. The draft multiple should not exceed 7 or 8. The total combined number should not exceed 120. The roller spacing varies with the length of the raw cotton of the variety being spun. It is required that the flannel can be operated flexibly, the combing knife works well, the rollers are clean, no concave core, no bending, and the rotation must be flexible and the pressure must be solid. The speed should not be too fast, as slow as possible to ensure the output. The volume of small rolls should be set according to the fiber fineness of the spinning variety.

Control of neps in the combing process

Separation of the comber

The suitability of the split apron directly affects the technical indicators such as sliver and neps. If the detachment is too large, the neps at the cotton net apex will not be combed thoroughly. Adjust the separation tab down to control the neps here.

Combs and cylinders

They are the most critical parts to determine the quality index of combed sliver. Reasonable use and full play of the combing effect of cylinders and top combs are the key to controlling combed neps.

The selection of combed cylinders and top combs should be matched with the types of combed yarns. Medium and low count combed yarns use 1449 from Nakagawa, Japan and 5014, such as Graf of Switzerland and corresponding top combs. 1454 in Zhongchuan and 5015 in Graf, Switzerland, etc. 7015 tin in Graf, Switzerland should be suitable for spinning medium and high combed yarns.

The height of the top comb should be moderate, usually between -0.5 and 0.5. Inserting too deep can easily cause holes in the cotton net. At 40 divisions, open the separation roller to observe the insertion depth of the top comb, which is better centered.

Adjust the combing distance of the cylinder, that is, the distance between the cylinder and the upper jaw. The ideal position is between 0.3 and 0.5. This position can give full play to the carding effect of the cylinder.

Adjust the carding index of the cylinder. The carding index of the cylinder should be determined according to the model of the cylinder. According to the summary of many years of practice, it is obtained that the small angle cylinder is positioned at 38 divisions under the condition of controlling the neps. The 38 division can fully play the carding effect of the cylinder and assist the top card to comb the back of the cotton net.

The combing load of the top comb of the comber is about 4.5 times that of the cylinder. Therefore, only when the top comb is properly used and the carding effect of the top comb is fully exerted can the neps be better controlled. The top comb is moved forward. After the top comb is moved forward by 6mm, the combing performance of the top comb can be fully exerted. Under the same conditions, moving the top comb forward can reduce neps by about 20% and reduce the dryness by 0.4 percentage point. However, it should be noted here that after the top comb is moved forward, interference between the cylinder and the top comb is likely to occur, and the top comb and the separation roller collide and rub.

Double top comb, combing cotton oranges after double top comb can reduce 30% ~ 40% under the same conditions, but attention should be paid to the change of noil rate after double top comb and cleaning of top comb.

Adjustment of the brush

Large neps tend to occur when the distance between the brush and the cylinder is large, but small neps appear when the distance between the brush and the cylinder is small. Therefore, the adjustment of the brush should be done after adjusting and observing the cotton net. Brush speed and automatic cleaning time should be determined according to the speed of the cylinder.

Neps control of table and drafting parts

There is a large area of friction between the table top and the combed cotton sliver, and the nap is generated due to the friction between the processing burr and cotton wax and the cotton sliver. Therefore, the countertop must be cleaned and regularly scrubbed with gasoline and talcum powder. The drafting components are mainly rollers and rollers, so the rollers and rollers must also be clean and free of burrs.

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