Common sense of knitting fabric shaping

1. polyester: polyester is an important variety of synthetic fiber and the trade name of polyester fiber in China.

It is a fiber-forming polymer, polyethylene terephthalate (PET), which is made of purified terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) through esterification or transesterification and polycondensation, and is made into fibers through spinning and post-treatment. Polyester is widely used in making clothes and industrial products.

Polyester has excellent setting performance. The flat, fluffy or pleated polyester yarn or fabric generated after setting can remain unchanged for a long time after repeated washing in use.

Performance 1, high strength. The strength of short fiber is 2.6~5.7cN/dtex, and the strength of high strength fiber is 5.6~ 8.0cN/dtex.

Because of its low hygroscopicity, its wet strength is basically the same as its dry strength. The impact strength is 4 times higher than that of nylon and 20 times higher than that of viscose fiber.

2. Good elasticity. Elasticity is close to wool, and it can be almost completely restored by stretching 5%~6%.

The crease resistance is better than other fibers, that is, the fabric does not wrinkle and has good dimensional stability. The elastic modulus is 22~ 14 1cN/dtex, which is 2~3 times higher than that of nylon.

3. Good heat resistance. 4. Polyester has smooth surface, tight internal molecular arrangement and lack of hydrophilic structure between molecules, so its moisture regain is very small and its moisture absorption performance is poor.

5, good wear resistance. Wear resistance is second only to nylon with the best wear resistance, and superior to other natural fibers and synthetic fibers.

6. Good light resistance. Light resistance is second only to acrylic fiber.

7. Corrosion resistance. Resistant to bleaching agents, oxidants, hydrocarbons, ketones, petroleum products and inorganic acids.

Dilute alkali resistance is not afraid of mildew, but hot alkali can decompose. 8. Poor dyeability 2. Spandex: Spandex is short for polyurethane fiber, and its trade names are Lycra (USA, UK, Netherlands, Canada, Brazil), Neolon (Nylon, Japan), Dorlastan, Germany, etc.

First, 1937 Bayer Company in Germany succeeded in research, and 1959 DuPont Company in the United States began industrial production. At present, there are nearly 40 factories and 7 production lines, with an annual total output of about 654.38+10,000 tons. The existing production capacity in China is about 1 10,000 tons.

Spandex is a kind of synthetic fiber, which contains more than 85% polyurethane. There are two kinds of spandex fibers, one is a polymer with aromatic diisocyanate and hydroxyl-containing polyester segments (polyester spandex for short), and the other is a polymer with aromatic diisocyanate and hydroxyl-containing polyether segments (polyether spandex for short).

Spandex fiber, elastic polyolefin fiber and elastic composite fiber are collectively called elastic fibers. Synthetic fiber with high elongation at break (above 400%), low modulus and high elastic recovery rate.

China trade name of multiblock polyurethane fiber. Also called elastic fiber.

Spandex has high elongation (500%~700%), low elastic modulus (200% elongation, 0.04 ~ 0. 12g/ denier) and high elastic recovery (200% elongation, 95%~99%). In addition to high strength, other physical and mechanical properties are very similar to those of natural latex yarn.

It is more resistant to chemical degradation than latex wire, with moderate thermal stability and softening temperature above 200℃. Most dyes and finishing agents used for synthetic fibers and natural fibers are also suitable for dyeing and finishing spandex.

Spandex is sweat-resistant, seawater-resistant, resistant to all kinds of dry cleaners and most sunscreen oils. Long-term sun exposure or chlorine bleach will also fade, but the degree of fading varies with the type of spandex.

The reason why spandex fiber has such high elasticity is that its polymer chain consists of low melting point amorphous "soft" segments as matrix and high melting point crystalline "hard" segments embedded in it. The molecular chains of flexible segments are crosslinked to form a certain network structure. Because the interaction between molecular chains is very small, they can expand and contract freely, resulting in great elongation.

The molecular connecting force of the rigid segment is relatively large, and the molecular chain will not extend indefinitely, so the elasticity is high. Most of the cross sections of radon nylon wires are dog-bone-shaped, and some wires have smooth or serrated surfaces.

The breaking strength is the lowest among all textile fibers, only 0.44~0.88CN/dtex (the strength of polyether type is higher than that of polyester type). The moisture absorption range is small, generally 0.3- 1.2% (the moisture absorption rate of multifilament is slightly higher than that of monofilament).

Heat tolerance varies greatly with different varieties. Most fibers will not be damaged when stored for a short time in the range of 90~ 150℃. The safe ironing temperature is below 150℃, which can be heated and disturbed and wet washed. It has excellent dyeing performance, can be dyed in various shades, has strong affinity for fibers, can adapt to most kinds of dyes, has good chemical resistance, is resistant to most acids and bases, chemicals, organic solvents, dry cleaners and bleaches, is resistant to sunlight and snow, but is not resistant to oxides, and is easy to make fibers yellow and reduce strength.

Generally, spandex is not used alone, but a small amount is mixed into the fabric. This kind of fiber has both rubber properties and fiber properties, and is often used in core-spun yarn with spandex as the core, which is called elastic core-spun yarn. The main characteristics of this kind of yarn are: first, it can obtain good hand feel and appearance, and the outer fiber composed of natural fibers has good hygroscopicity; Second, only 1- 10% long spandex yarn can produce high-quality elastic yarn; Thirdly, the control range of elasticity percentage is from 10% to 20%, and different elasticity values can be selected according to the use of the product.

It is easy to spin silk with different thickness of 25~2500 denier, so it is widely used to make elastic knitted fabrics, such as socks, furniture covers, ski clothes, sportswear, medical fabrics, belts, military equipment, elastic parts of spacesuits and so on. As people put forward new requirements for fabrics, such as lightness, comfort and softness, the proportion of low denier spandex fabrics in synthetic fiber fabrics is also increasing.

There are nude spandex yarns and twisted yarns formed by combining spandex with other fibers, which are mainly used in various warp-knitted and weft-knitted fabrics, woven fabrics and elastic fabrics. 3. Carding: carding is to comb the small cotton bundle into a single fiber state by using a cover plate or roller carding machine with the help of needle surface movement, further remove impurities and non-spinnable short fibers, make the fibers parallel and straight, and finally make cotton sliver and put it into a sliver cylinder.

4. Cotton: 1. Pure cotton fabrics are made of pure cotton yarn. There are many kinds of fabrics and different colors. Pure cotton fabric is breathable, hygroscopic and comfortable to wear, but it has a prominent disadvantage-warping.

2. Knitted fabric shrinkage test flow (method \ time \ drying mode)

Discuss with you. If there are any mistakes or deficiencies, please feel free to raise them.

First of all, it has something to do with fiber. But I haven't said such relevant knowledge (this is my reply to the midnight cat. That question), probably because I haven't learned it (I don't have much knowledge).

Shrinkage rate can be controlled: general fabrics are dry steamed and washed. You can calculate the shrinkage rate! After the measurement, calculate and provide the data to the model owner, and the model owner will release the appropriate amount after reference. It doesn't matter.

The above is the basic process.

The specific methods are (hereinafter I mainly talk about dry steaming and water washing):

A: Dry steaming-also known as "scalding" the fish on it.

1) Draw two pieces of fixed length and width (large enough) on the cloth to be measured. For knitted underwear, 40*40CM is generally enough, that is to say, it is necessary to leave a seam of about 2CM or more, because the area of underwear (like * * *) is very small, but the shrinkage rate of knitted fabric is very large. Such as spandex cloth, modal cloth and so on. If the shape is not set properly, it may shrink horribly.

2) Put two pieces of cloth with a fixed size on the opposite sides, and get on the bus at the painted mark with a flat car, so that the front of the cloth will be outside, which is convenient to see the color difference and color fastness together and save materials. When you wear it, use an edge sewing machine to lock the edge along the seam with a length of more than 2CM. ..

3) Now is the critical moment of dry steaming! Take this cloth to the ironing man and steam it! ! ! Watch the time. The general knitted fabric will take about 5 minutes. When the fabric with large shrinkage rate is steamed, you can still see it shrink with your eyes! ! ! Ha ha. That kind of cloth is not good material! !

Special attention: don't let the iron touch the cloth when steaming! ! In other words, don't iron this cloth like other people's clothes! ! ! But it's a long way! About an inch! That's good. You have to double it and move it at any time to make it heated evenly and accurately! In addition, try to turn on the suction device of the machine. ..

4) After steaming, take it to a ventilated place to dry. Please be careful not to dry it in the sun! This calculation is also invalid! !

5) After drying, calculate. Pay attention to the warp and weft directions of materials. The warp direction is also straight yarn, and the weft direction is horizontal yarn. (Except twill) For example, the warp direction has shrunk to 38CM, which means 38-40=2 /40=0.05* 100%=5%. That is to say, the shrinkage rate of this cloth in the warp direction is 5%. So is the calculation of weft direction >

6) Finally, the dry steaming part is basically completed. In addition to providing data for the sample, all you have to do is leave your original (that is, the test cloth) at the bottom. ..

Now let's talk about B: Washing: (Take knitted fabrics as an example, because my previous company was knitting.)

The previous steps are the same as those in 1) 2) above. Prepare the test sample first. ..

3) Water washing is more complicated. What is complicated is not the algorithm of water washing shrinkage, but too many water washing methods!

But these are all based on the characteristics of fabrics and the requirements of guests! The following are some names of washing shrinkage:

Dry cleaning dry cleaning

Machine washable

Commercial washing has no kind washing.

Household washing machine

hand wash

Cold washing

Warm water cleaning

Wash with hot water.

The key point is machine washing, machine washing, although you just press the button, but the time should be chosen well. In the past, our company had a washing machine specially used for testing, not the kind used at home. The shrinkage rate of cloth washed in different time and different washing methods is different!

According to time, there are standard washing, home washing, ultra-short washing, extended washing and soaking washing ... Different machines have different views.

In the above washing methods, you can also choose whether to use the drum in the washing process according to the needs of the guests and the characteristics of the fabric. What's the water temperature? Whether to dry (generally, the shrinkage of cloth can not be dried, but it can be dried when the finished product is inspected. ) Wait ... ..

4) After washing, it is usually dried, not dried!

5) Calculate the shrinkage rate, which is the same as the previous dry steaming algorithm. In general, the shrinkage of dry steaming is smaller than that of water washing. ..

6) Consistent with the previous practice .. Provide the calculation results to the technical department in written form, and archive them on their own. ..

3. Hello, I want to know about clothing fabrics, such as pure cotton and combed cotton.

Only the commonly used raw materials of clothing fabrics in the market are mentioned, and the special raw materials are no longer discussed.

1 pilling. Theoretically, long fibers don't shed hair. Therefore, the fabrics of polyester, nylon and viscose fiber will not pilling. However, the raw materials of these components can also be short fibers, or the fabrics of long fiber raw materials have been subjected to pilling treatment such as sanding and scraping (pilling treatment means destroying fibers, and the hairs that come out are all broken fibers), and then pilling will occur. Because the raw materials of chemical fiber are very static after friction, the degree of pilling will be very severe. Cotton is a short fiber, although it can pilling, but it is not as easy to have static electricity as chemical fiber, so the pilling degree is lighter.

2 washing deformation. Viscose fiber is the most easily deformed. Cotton is fine, as long as there is no big problem in setting and finishing, and the fabric structure is not easy to deform, it will not deform. Other polyesters and nylons are not easily deformed.

3 Shrinkage rate Viscose has the most severe shrinkage, and the shrinkage rate of all-viscose knitted fabrics often exceeds 10%. Others, such as cotton, polyester and nylon, will do. Conventional fabrics can be controlled within 3%

4 elasticity. Needless to say, Lycra is spandex, which is the most elastic. According to different spinning and processing methods, the elasticity of polyester fiber can vary greatly. Other fibers are weak in elasticity.

5 yellowing and fading Strictly speaking, yellowing and fading are two concepts. Yellowing is discoloration, and fading is a matter of color fastness. Polyester is the best, others are not far apart. However, compared with other fibers, cotton is not as bright as other fibers.

Absorbent cotton and viscose fiber are the best, and viscose is better than cotton. Other fibers hardly absorb water (except those specially treated)

7 breathability needless to say, cotton is the best, and nothing else works. Relatively speaking, viscose is slightly better.

Why didn't you mention Lycra before? Lycra is actually a brand name. The earliest exporter of elastic fiber was DuPont Company (now sold by DuPont Lycra Management Department, and the new company was named Invista), which registered the trademark for their elastic fiber-spandex. At present, there are many non-Lycra spandex fibers, but because Lycra brand is well publicized and is the first one, many people regard Lycra as a synonym for spandex. Hong Kong people and Cantonese people like to call elastic fiber "pull frame", which is also the Cantonese transliteration of Lycra.

Elastic fiber spandex, which is spun into other yarns to increase the elasticity of the fabric, basically accounts for a small proportion of the fabric components and has little influence on the above physical properties of the fabric (except elasticity and shrinkage, the shrinkage of spandex is slightly higher). So don't mention spandex in front.

By the way, unnatural fibers such as chemical fibers and synthetic fibers can be made into short fiber forms and long fiber forms. In the short fiber form, the physical properties and hand feel will be closer to the short fiber natural fiber than in the long fiber form (the chemical properties are basically independent of the long and short fibers).

4. How should the cloth be inspected? What kind of inspection standards are there?

1), the color difference is out of the allowable range.

2), continuous pilling, or obvious creases or repair marks.

3) Printing defects (referring to regularity or batch) with a specification error of more than 5% do not meet the finished product specifications.

4) The number of knotted yarns less than 25 yards exceeds 1 piece. Multiple E799BE5BAA6E997AEE7AD9431333431366366 knotted yarns are allowed in large quantities, but the spacing should not be less than 25 yards, which will affect the appearance of finished products.

5) There is obvious color difference when the binding distance is less than 25 yards, including appearance, specification, density, softness, selvage and color.

Extended data:

Secondary test:

This scoring method is mainly suitable for knitted fabrics, but also for woven fabrics. The basic concepts and modes of "four-point system" and "plus-point system" are very similar, but the points of deduction are different. The evaluation method is the same as "+scoring system J". Inspectors check the defects of each cloth according to the defect scoring standard, record them on the report form, and give a deduction as the grade evaluation of the cloth.

1. Score according to defect length.

1"-3 "will be deducted; 1 will be deducted; 3"-6 "will be deducted; Two points will be deducted.

3 points will be deducted for 6 "-9", and 4 points will be deducted for more than 9 ".

2. The defect scoring principle:

A. No more than 4 points will be deducted for all defects in the warp and weft directions of the same code.

B, hole regardless of size 4 points.

C, no points will be deducted within one inch of selvage.

D continuous defects must be cut or downgraded.

Any hole larger than the pinhole will be deducted 4 points.

F, regarding the warp or weft direction, no matter what the defect is, the principle is visibility, and the correct one will be deducted according to the defect score.

G, except for special provisions (such as coated tape), usually only need to check the front of the cloth.

Baidu encyclopedia-textile fabrics

5. Cloth knowledge of luggage materials

Bagging materials are generally divided into main materials and auxiliary materials. The main materials can be divided into: fabric composition: sizing yarn: definition of yarn Denny number (fixed length): take a yarn with a length of 9000m, and if it weighs 70G, it will be 70D, 2 10G and 2 10D, and so on. The higher the Denny number, the thicker the yarn and the thicker the cloth (usually used for long fiber yarn), which is called several yarns. If it is 840 yards 10 times, it is called 10 yarn. If it is 20 times of 840 yards, it is called 20 yarns, and so on. The larger the count, the finer the yarn (usually used for staple yarn). A. yarn type: 1. Natural fiber: 1) Plant fiber: cotton (jute, flax, ramie) 2) Animal fiber: wool silk) 2. Synthetic fibers: nylon (nylon) (polyester) (polyester) (acrylic fiber), polypropylene (PP) and polyethylene (PE)3. Man-made fiber: rayon (ray). There are two kinds of staple blended yarn: T/R T/C.B. As far as brightness is concerned, it can be divided into semi-bright yarn/bright yarn/triangular bright yarn. C. in terms of processing, it is divided into 1. Precursor (unprocessed): UDY (unexpanded) POY (fully extended) 2. Processing yarn 3. Rotate 4. Wrap yarn. Gradually extinguished, white smoke, burnt, gray, soft. 2 Twist: immediate burning, flame stable, immediately extinguished, white smoke, burnt, gray, soft. 3 Nylon: first shrink, curl, melt, gradually burn, white smoke, celery-like, gray block, shiny. 4. Dull. 5.PE: shrink, curl and melt first, and then burn immediately, resulting in black smoke, paraffin smell and yellowish brown lumps. 6.PP: It melts first, then burns quickly, and the flame jumps, producing black smoke and pungent smell. Black irregular lump. Embryo cloth: a. According to the weaving method (different looms): 1. Knitted cloth: mesh cloth, Meijia cloth, plush shearing wear-resistant cloth, KEVLA L Lycra 2. Plain cloth: Taft Oxford cloth, CORDURA ballistic 3. Skeleton cloth: 3/ 1 twill 2/ 2 twill jacquard plaid satin 4. Jacquard cloth: colored yarn plaid curtain logo jacquard bed linen tablecloth 5. Non-woven fabric: Lixin cloth, needle cotton (pay attention to thickness/yard weight/grain/color), plain cloth, twill cloth and jacquard cloth are all woven by warp and weft yarns up and down. Due to the different warp and weft materials/numbers and weaving methods, fabrics of various sizes can be changed. The specification representation method is: 420D (Denny number of warp yarn) *420D (Denny number of weft yarn) /50T (Denny number of warp yarn) *36T (Denny number of weft yarn). Knitted fabrics are made of warp yarns and weft yarns in the form of loops. Usually divided into warp knitting and weft knitting. Denny number/code weight/code width is often used to indicate its specifications. The common specifications of nylon cloth are: 70d: 70d *170t+pu170d *190t+0.3mm PVC 70d rhombus+pu2+wr/210d:1/kloc-0. Kloc-0/6t+Pu286T+0.4MM PVC 420D diagonal +PU2+WR 420D cross jacquard Pu2+WR840d+Pu2/PVC1680d+Pu2/PVC Cordura: 500d+Pu2+WR/PVC1000. Common specifications of PVC Teduolong fabric: 75D printed fabric +0.3MM PVC 150D herringbone diagonal+PU 1 300d * 6543876t+PU2+WR1200d+PU2+WR/0.6mm PVC10. PP fabric: 1000D PP plain fabric +PU2+WR 1200D PP twill fabric +PU2+WR 350D PP twill fabric +PU2+WR PP fabric is light in weight. It has antifouling and antibacterial properties and can decompose naturally. 2.PE coated cloth: also known as PE plastic cloth, it is made by coating PE on the upper and lower sides of PE plain cloth. 3. Woven fabric of warp and weft: 420D*300D N/T two-color cross jacquard +PU2 (with two-color effect) T/ flax: 300D* 12 S/2+0.4MM PVC (low import tariff in the United States) Dyeing and finishing process: grey cloth → coloring → dyeing. Water splashing) → After packaging, send it for printing/gluing or gluing 1. Dyeing should be considered after processing and pasting PVC2. 2. Dyeing can be divided into normal temperature (nylon) and high temperature (Tedoran/plain fabric/pleated fabric). Attention should be paid to color fastness (sun exposure/washing/rubbing/ultraviolet resistance) and non-azo dyes (Europe * * * requires all fabrics to be azo-free. Fix the yarn structure at the high temperature of 140~ 190℃, control the width and feel (add resin), and do water splashing or fire prevention treatment. 4. After the colored cloth is finished, there are the following treatments: 1). Printing: ink (roller printing) paste printing (rotary printing) paper printing (thermal transfer) automatic screen printing 2). Hot pressing: at high temperature, the patterned roller contacts the cloth surface to form a pattern 3). Sanding/pilling/brushing: sandpaper/needle/brush. Waterproof and moisture permeability), in order to achieve the effect of waterproof/yarn fixation and reinforcement, attention should be paid to the requirements of waterproof and moisture permeability, and the haze and feel of the rubber surface should not be too hard. 5). Sticking: mainly divided into PVC glue /CPU glue (EMB glue) /TPE glue/flexible glue (1). PVC glue: PVC film sticking cloth, to achieve waterproof and fixed yarn. Pay attention to handle/grain/thickness/cold resistance and low toxicity. (2) CPU glue: If the CPU glue is evenly coated on the cloth surface, it can also achieve the waterproof/reinforcing/yarn fixing effect. It has the environmental protection characteristics of low toxicity, natural decomposition and burning without toxic gas, and should pay attention to the requirements of hand feel/texture/rubber color/cold resistance. (3 3).TPE/FLEX glue: The most important one at present. TPE glue is soft. 4). Bonding: refers to bonding cloth with PU foam /EVA/ sponge to achieve reinforcement or other functional functions (filling/thermal insulation/compression resistance). Leather can be divided into: a. Natural leather: (constituent elements: thickness/grain/haze/coloring or penetration dyeing) 1. Cowhide

6. How to calculate clothing materials

Fabric calculation formula: fabric price = yarn price+weaving price+dyeing price+others (including printing, opening and setting, and subsequent processes).

Coating material:

Material: (bust +6CM)X (length +6CM)X 24 X gram weight X (1+ total loss)

Sleeve material: (shoulder+cuff +4CM)X (sleeve length +4CM)X 24 X gram weight X( 1+ total loss)

Picking: (collar width X2+2)X collar height X 12 X gram weight X (1+ total loss)

Material of each dozen clothes = material of big body+material of sleeves+material of collar.

Pant material:

(crosspiece+leg circumference +4CM)X (pants length +8CM)X 24 X gram weight X (1+ total loss)

Extended data:

Fabric type:

1, cotton cloth

Is the floorboard of all kinds of cotton textiles. Cotton cloth is divided into cotton cloth and rayon. Mostly used to make fashion, casual wear, underwear and shirts. Its advantages are easy to keep warm, soft and close-fitting, moisture absorption and air permeability. Its disadvantage is that it is easy to shrink and wrinkle, and its appearance is not crisp and beautiful, so it must be ironed often when wearing it.

2. Flax

It is a kind of cloth made of hemp, flax, ramie, jute, sisal, banana and other hemp plant fibers. Generally used to make casual clothes and work clothes, and mostly used to make ordinary summer clothes. Its advantages are extremely high strength, good hygroscopicity, thermal conductivity and air permeability. Its disadvantages are uncomfortable to wear and rough and stiff appearance.

3. Silk

It is the general name of all kinds of silk fabrics woven from silk. Like cotton cloth, it has many varieties and different personalities. It can be used to make all kinds of clothes, especially women's clothes. Its advantages are light, healthy, soft, smooth, breathable, colorful, shiny, elegant and comfortable. Its disadvantages are easy to wrinkle, easy to absorb, not strong enough and fast fading.

4. woolen cloth

Also known as wool, it is the floorboard of all kinds of fabrics made of wool and cashmere. Usually suitable for making formal and high-grade clothes such as dresses, suits and coats. Its advantages are wrinkle resistance, wear resistance, soft feel, elegance, flexibility and warmth. Its main disadvantage is that it is difficult to wash and is not suitable for summer clothes.

5. Leather

This is a tanned animal fur fabric. Mostly used to make fashion and winter clothes. It can also be divided into two categories: one is leather, that is, leather that has been depilated. The second kind is fur, which is treated leather with fur. Its advantages are lightness, warmth and elegance. Its disadvantages are high price, high requirements for storage and care, and it is not suitable for popularization.

6. Chemical fiber

It is short for chemical fiber. This is a fiber textile made of polymer. Usually divided into two categories: man-made fibers and synthetic fibers. Their advantages are bright colors, soft texture, crisp drape, smoothness and comfort.

Their disadvantages are poor wear resistance, heat resistance, hygroscopicity and air permeability, easy to deform when heated and easy to generate static electricity. Although it can be used to make all kinds of clothes, the overall grade is not high and it is difficult to be elegant.

Step 7 mix

It is a fabric made of natural fibers and chemical fibers in a certain proportion, which can be used to make all kinds of clothes. Its advantages are that it not only absorbs the respective advantages of cotton, hemp, silk, wool and chemical fiber, but also avoids their respective disadvantages as much as possible, and its value is relatively cheap, so it is very popular.

8. modal

Modal is a kind of regenerated cellulose fiber, which contains viscose fiber with high wet modulus. The raw material of this fiber is beech in Europe, which is first made into wood pulp and then processed into fiber through a special spinning process. The raw materials of this product are all natural materials, which are harmless to human body, can decompose naturally and are harmless to the environment.

Modal fiber is characterized by combining the luxurious texture of natural fiber with the practicality of synthetic fiber. It has the softness of cotton, the luster of silk, the smoothness of hemp, the water absorption and breathability are better than cotton, the dye uptake is high, and the fabric is bright and full.

Modal fiber can be blended with cotton, hemp, silk and other fibers. To improve the quality of these fabrics, keep them soft and smooth, give full play to the characteristics of their respective fibers, and achieve better use results.