Which Kind Of Mercerizing Is More Advantageous For Cotton Knitted Fabrics?

< p > cotton knitted fabric: which kind of < a href= "http://www.91se91.com/news/index_c.asp" > mercerizing < /a > has more advantages. In the dyeing and finishing of cotton and its blended knitted fabrics, mercerizing is a very important link. How to choose the right mercerizing way directly affects the quality of products and the consumption of dyes and chemicals, and also plays an important role in improving the wearability of products and reducing the cost.

In this issue, Chen Liangtian and vice general manager Jiang Xiaofeng, chairman of Shanghai Sino man Electric Machinery Co., Ltd. were invited to talk about the selection of mercerizing process and equipment for cotton knitted fabrics.

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< p > reporter: why do cotton and its blended knitted fabrics need mercerizing? < /p >

< p > Chen Liangtian: the development, quality improvement and grade upgrading of cotton and its blended knitted fabrics need mercerizing and mercerizing.

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< p > for example, cotton and its blended T-shirts, buttons, jackets, skirts and other knitted outerwear fabrics are distinctly different from mercerized and mercerized products.

In appearance, mercerized products present a kind of cotton like cotton, silk like and non silk texture. The touch is soft, cool, comfortable, full of color, lustrous and attractive, revealing a distinctive beauty and having a distinctive style.

After mercerizing products give people the overall impression that the product is of high grade.

If the products are made of mercerized products and new styles and colors, the price of a T-shirt can reach hundreds of dollars in the domestic market, and the overseas high-end market can sell for hundreds of dollars.

This is several times higher than the average product.

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< p > cotton knitted fabric dyeing or printing mostly uses active technology. After mercerizing treatment, the physical and chemical changes of cotton fibers can increase the color yield of reactive dyes greatly, save 2~3 of dyeing and finishing materials. In the production of dark products, especially black, dark blue, dark green, caffeine, etc., mercerizing must be used to produce high quality products.

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< p > after the mercerizing of the knitted fabric, the moisture absorption and elasticity increase obviously, which is the preferred fabric for sportswear, such as vest and sportswear.

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< p > and with the improvement of people's living standard, there are many new demands for the quality of knitted underwear. In order to meet these needs, a variety of collation is an important means. Mercerization is one of its feasible means.

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< p > reporter: what are the mainstream mercerizing methods? Which is the most advantageous? < /p >

< p > Jiang Xiaofeng: < a href= "http://www.91se91.com/news/index_s.asp" > knitted < /a > mercerizing way, there are three kinds of cylinder knitted mercerizing, split width flat mercerizing machine and plain mercerizing machine.

These three mercerizing methods I advocate the use of cylinder knitted mercerizing.

In the cylinder mercerizing, the air expanding type of alkali removal and the infiltration zone are also advocated.

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Why did P advocate the use of cylinder knitted mercerization? The reasons are as follows: < /p >

< p > first, the production process is reasonable and smooth, and the production efficiency is high.

At present, most of cotton knitted fabrics are intermittent. The basic process of dyeing and finishing process (with mercerized oxygen bleaching process as example): Knitted grey cloth (Shao Mao) - mercerizing (including acid neutralization) - scouring bleaching - dyeing soft treatment - dehydration - drying - finishing - testing - packaging.

This is the basic process.

Dark, medium and light colors vary, but no matter how the process changes, mercerizing is usually arranged in front of boiling and dyeing.

At present, the boiling and dyeing processes of cotton knitted fabrics are mostly based on the intermittent way of the liquid flow cylinder. According to the characteristics of knitted fabrics, the fabric is tubular in order to ensure the quality, and the cylinder mercerization is in line with this requirement.

If it is a slit mercerizing, after mercerizing, it should be stitched again and turned into a cylinder and then bleached and dyed. After dyeing, the suture will be disassembled and turned into a flat width, so that the width of the stitch will be increased by suturing and dismantling two ways than cylinder mercerizing.

The cylinder mercerization is evident in the dyeing and finishing process of knitted fabrics. Compared with the split mercerizing, the mercerization can save manpower and material resources and improve labour productivity.

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< p > secondly, the manufacturing cost of cylinder knitted mercerizing machine is lower than that of the split knitting mercerizing machine.

The cylinder mercerizing machine is small in size, about half of the width, and much lower in material and labor cost.

And whether it is the international market or the domestic market, the cylinder mercerizing machine is much lower than the market price, which creates a good economic condition for the wide application of the production enterprises.

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< p > again, cylinder knitted mercerization has no defect quality loss in dyeing and finishing processing.

After slit mercerizing, it needs to be boiled and bleached and dyed from a flat cylinder to be sutured. After processing, the cylinder is then removed and stitched into a flat width. The dyeing defects, crepe strips and other quality losses caused by these two processes are over 2%.

People with production experience know that it is very demanding to remove the stitched cylindrical fabric into flat width. Not only do we need to remove the suture line without leaving "tail", but also control the tension of the fabric, do not cause the fabric to have excessive deformation, and ensure the consistency between the coil and the density of the knitted fabric.

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< p > finally, the cylinder knitted mercerizing method has the advantages of less floor space, water saving and energy saving compared with the split mercerizing method.

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< p > of course, these comparisons are based on the performance and operation of cylinder or split mercerizing.

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< p > reporter: why do we advocate the use of inflatable cylinder mercerizing mode? < /p >

< p > Chen Liangtian: the so-called inflated cylinder mercerization means that the mercerized stable fabric is used to remove the alkali from the weft knitted fabric by compressing the air to form a cylinder, and to spray the hot alkali (or hot water) in a circular way to remove the strong alkali from the fabric.

This is the key to mercerization.

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< p > the main advantages of inflatable cylinder mercerization: first, the fabric is in tension controlled state, which is conducive to the appearance of fabric luster.

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< p > appropriate tension is one of the key conditions for cotton fabric to produce satisfactory luster. It is one of the important factors to ensure the mercerizing effect.

Air inflation and its circular rinse and alkali removal method make the fabric vertically and horizontally balanced at the same time and make mercerizing better.

In this respect, the advantages of air filled cylinder mercerization are evident compared to plain circular mercerization of knitted cylinders.

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< p > two is that the fabric is uniformly distributed and has no difference in quality.

For fabric, it is not only required to strain the alkali, but also the tension distribution is uniform.

Make mercerizing product quality right, left, right and right.

According to the same pressure characteristics produced by static gas pressure, the tension after air inflation can meet this requirement.

Compared with the open width needle plate stretching mercerizing machine and the mechanical cigar bracing cylinder mercerizing, the fabric has uniform distribution of force and the mercerizing effect is the same as the left, right and right parts, and has no boundary and no difference.

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< p > three is in the stable area of air expansion and annular spray to remove alkali, compared with the split mercerizing, it is beneficial to prevent the production defects such as fabric crimping, and so on.

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< p > reporter: why does the permeation and expansion area of cylinder knitted mercerizing adopt a loose pile? < /p >

< p > Jiang Xiaofeng: the so-called loose pile is that after the fabric is strongly concentrated, the expansion and expansion of the fabric is completed under the condition of no tension and static state. The fabric is carried forward by caterpillar.

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< p > why there are two main reasons for loosening method: the first is to prevent creases.

The knitted cylinder fabric is flat after rolling. The two sides are in a folded state. It is not easy to produce creases on both sides while keeping the tension and tension free state in operation.

For traditional roller ventilation, no matter what kind of measures to reduce tension, tension always exists, but the difference of tension size can not avoid the crease. Especially for dyed products, the prevention of creases and creases of semi-finished products is more demanding. Once the control is not good, the quality problem will arise.

Loosening is the safest option to prevent creases, and is consistent with the characteristics of cotton knitted fabrics.

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< p > secondly, loose bulk and large volume of cloth to create conditions for full expansion of fabric to meet the technological requirements of various a href= "http://www.91se91.com" > fabric > /a >.

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< p > this is due to three considerations: first, the mercerization of cotton knitted fabrics is carried out in the uncooked and bleached raw green state. The high concentration of caustic soda is difficult to penetrate the green body and takes a long time.

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< p > two, when the base is rolled, the fabric is cylindrical and flat. To prevent creases, the pressure of the roller is very light, which is not good for alkali penetration.

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< p > three is the interference of air and is not conducive to the penetration of alkali.

The fabric is blown into a cylinder before entering each rolling point, and then enters the rolling point, which prevents the crease wrinkle, but it is unfavorable to the penetration of alkali and requires a process of discharging air.

The above three aspects which are unfavorable to alkali penetration can be obtained in loose piling, and compensation regulation is achieved to achieve high quality mercerizing.

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