CN114381952A - Warp knitting dyeing and finishing process - Google Patents

Abstract

The invention discloses a warp knitting dyeing and finishing process, which belongs to the technical field of dyeing and finishing processes. S1, setting; S2, blank inspection; S3, desizing; S4, washing; The organic acid release agent controls the pH value of the dyeing bath to optimize the dyeing process; S6, dehydration; S7, flame retardant setting; S8, brushing: according to the production requirements of the product, control the hair height of the fabric; S9, scalding: in order to improve the appearance quality, Improve the applicability of the product, adjust the feel of the fabric, make the calendered surface of the fabric more flat, and reduce the gap between the fabric fibers; S10, shearing: further improve the grade of the product, increase the added value, maintain a certain level of flatness, and improve the surface of the fabric. S11, rolling, this warp knitting dyeing and finishing process provides prerequisites for the uniform density of nylon warp knitted fabric to be rolled onto the warp beam, and at the same time, it can avoid excessive shrinkage of nylon fiber fabric and improve dyeing. Effect.

Description

A warp knitting dyeing and finishing process

technical field

The invention belongs to the technical field of dyeing and finishing processes, and in particular relates to a warp knitting dyeing and finishing process.

Background technique

Weaving processes include weaving (also known as weaving), knitting, weaving and non-woven, of which knitting is further divided into warp knitting and weft knitting. Warp knitting is a textile process that belongs to the field of knitting. A knitted fabric is formed by using one or several groups of parallel yarns to be fed into all the working needles of the machine in the warp direction at the same time. This method is called warp knitting, and the formed knitted fabric is called warp knitted fabric.

In the prior art, the dyeing and finishing process of warp knitted fabrics has been very mature, but there are still some deficiencies: First, in order to make the yarns lint-free during weaving, the yarns before weaving are sizing, so Desizing should be done before dyeing to facilitate coloring. The dyeing of fabrics in the dyeing and finishing process lacks standardization, which leads to color difference and poor dyeing effect due to different temperatures during the dyeing process.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a warp knitting dyeing and finishing process to solve the problems raised in the above background technology.

For achieving the above object, the present invention provides the following technical solutions: a warp knitting dyeing and finishing process,

S1. Setting: In order to ensure the dimensional stability of the fabric, the fabric is pre-shaped to prepare for dyeing;

S2. Blank inspection: The blank inspection is mainly to observe the quality of the grey fabric, whether there are any abnormalities such as drawstring, weft block, dead break, macula, and mildew;

S3. Desizing: Add the spandex protective agent BFC with a mass concentration of 3g/L in the desizing process, the desizing temperature is controlled at 40-80 ℃, and the desizing time is controlled at 15min;

S4. Washing: Wash with water after desizing;

S5. Dyeing: add a leveling agent to the dye bath, and use an organic acid release agent to control the pH to optimize the dyeing process;

S6. Dehydration: the moisture content of the dyed semi-finished product is too high, and the moisture content of the cloth surface is kept uniform after dehydration, so as to prepare for the subsequent process;

S7, flame retardant setting: coat a layer of adhesive paste on the surface of the fabric, and then bond a layer of flame retardant fabric on the upper surface of the adhesive paste. After the fabric is flame retardant and stereotyped, the physical and chemical properties are relatively stable ;

S8. Raising: According to the production requirements of the product, control the wool height of the fabric;

S9, ironing: in order to improve the appearance quality, improve the applicability of the product, adjust the feel of the fabric, make the calendered surface of the fabric more flat, and reduce the gap between the fabric fibers;

S10, shearing: further improve the grade of the product, increase the added value, maintain a certain level of flatness, and shear the protrusions on the surface of the fabric;

S11. Rolling: Check the quality of the finished products, classify the grades, and pack and roll them for shipment.

Further, in the dyeing process of step 2, the dyeing temperature is 95° C., and the dyeing flow rate is 240 m/h.

Further, the temperature is controlled at 160 degrees during the scalding process in step 6.

Further, in the step 1, the warp knitted fabric layer is woven from 50% cotton, 40% polyester and 10% spandex on a warp knitting machine.

The shaping in the above-mentioned step 1 is a pre-forming process, wherein the pre-forming temperature is 190° C., and the vehicle speed of the pre-forming process is 13.7 m/min.

In the above step 4, a relaxation agent is added during the washing process to maintain the relaxation of the surface of the fabric.

The formula of relaxation agent is: alkali 5g/L, scouring agent 10g/L and chelating agent 3g/L, washing temperature 80℃, fabric relaxation speed 13m/min.

In the above step 5, cationic dye is used for dyeing treatment, cationic polyester yarn is colored, polyester low elastic yarn is not colored, and the dyeing temperature is 95°C.

In the above-mentioned step 8, 7% raising agent and 1.5% bulking agent are selected for the raising and raising.

During the rolling process in the above step 11, the fabric is shaped by setting equipment, the setting temperature is 130°C, the setting speed is 10m/min, and the overfeed is 4%.

The technical effects and advantages of the warp knitting dyeing and finishing process: the advantages of the high temperature and high pressure warp beam dyeing machine are that the fabric has good dimensional stability, is not easy to wrinkle, and has a flat surface. The uneven tension generated during processing provides the prerequisite for the uniform density of nylon warp knitted fabric to be rolled onto the warp beam, and at the same time, it can avoid excessive shrinkage of the nylon fiber fabric. The dyeing rate is basically balanced above 95℃. Therefore, when the dyeing temperature is determined to be 95 °C, slowing down the dyeing heating rate can also slow down the rate of dyeing nylon with acid dyes and improve the dyeing effect.

Description of drawings

FIG. 1 is a process flow diagram of an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

Please refer to a warp knitting dyeing and finishing process as shown in Figure 1,

S1. Setting: In order to ensure the dimensional stability of the fabric, the fabric is pre-shaped to prepare for dyeing;

S2. Blank inspection: The blank inspection is mainly to observe the quality of the grey fabric, whether there are any abnormalities such as drawstring, weft block, dead break, macula, and mildew;

S3. Desizing: Add the spandex protective agent BFC with a mass concentration of 3g/L in the desizing process, the desizing temperature is controlled at 40-80 ℃, and the desizing time is controlled at 15min;

S4. Washing: Wash with water after desizing;

S5. Dyeing: Add leveling agent in the dyeing bath, and use organic acid release agent to control PH to optimize the dyeing process, which can effectively control the dyeing layer difference of nylon warp knitted fabric, and the dyeing effect is ideal. Warp beam dyeing machine, also known as reel dyeing machine, is a high temperature and high pressure dyeing machine composed of dyeing autoclave, hollow warp beam full of small holes, auxiliary cylinder (batching barrel), circulating pump, heat exchanger, warp beam transport vehicle, etc. During the dyeing process, the fabric is wound on a perforated shaft core, and the cloth roll is fixed by an iron frame with both ends of the cloth roll. A professional pump with high Yangcheng and large flow is used to make the dye liquor forward (from the shaft core) Inward to the outside of the cloth roll) or reverse (from the outside of the cloth roll to the inside of the warp beam) forcibly penetrate the fabric layer;

S6. Dehydration: The moisture content of the dyed semi-finished product is too high. After dehydration, the moisture content of the cloth surface is kept uniform, so as to prepare for the subsequent process. The dyed warp-knitted fleece fabric needs to be dehydrated. After inspection and determination, it meets the requirements. , and then dry, then carbon brush the plain surface of the fabric, and raise the extended surface of the fabric. Through carbon brushing and raising treatment, the raised surface of the fabric can be made fuller and the plain surface feels smooth. . The new warp knitted fleece fabric is more difficult to raise than the general raising because of the tighter shrinkage of the raising loop. Excessive raising and carbon brush pressure can easily cause vertical bars and holes, while too light and difficult to raise And carbon brush, so after many tests, when 3% raising agent and 2% bulking agent are used, the operation of raising and carbon brush is smooth, the fleece feeling is full after raising, and the cloth surface is smooth after carbon brushing. Finally, the warp-knitted fleece fabric is subjected to setting treatment. The setting temperature is 120°C, the setting speed is 10m/min, and the overfeed is 10%. After setting, the finished fabric surface is smooth, the physical and chemical properties are stable, and the two-way elasticity is good;

S7, flame retardant setting: coat a layer of adhesive paste on the surface of the fabric, and then bond a layer of flame retardant fabric on the upper surface of the adhesive paste. After the fabric is flame retardant and stereotyped, the physical and chemical properties are relatively stable ;

S8. Raising: According to the production requirements of the product, control the wool height of the fabric;

S9, ironing: in order to improve the appearance quality, improve the applicability of the product, adjust the feel of the fabric, make the calendered surface of the fabric more flat, and reduce the gap between the fabric fibers;

S10, shearing: further improve the grade of the product, increase the added value, maintain a certain level of flatness, and shear the protrusions on the surface of the fabric;

S11. Rolling: Check the quality of the finished products, classify the grades, and pack and roll them for shipment.

The power of the main pump directly affects the penetration ability of the dye liquor. If the dyeing flow (ie the pump power) is too small, the dye liquor cannot completely penetrate the fabric on the warp beam, and there will be large dyed flowers or progressive colors on the cloth surface; Large dyeing flow (that is, increasing pump power) can reduce this difference to a certain extent, speed up the movement of dye molecules, and facilitate the diffusion of dye molecules, thereby reducing the color difference between the inner and outer layers; but the main pump If the power of the dye liquor is too large, it will cause waste of power resources first, and secondly, when it passes through the dye liquid injection port, due to the large injection pressure, it will cause the cloth to spread. Therefore, the above phenomena must be considered when selecting the main pump. The efficiency of Pu is the highest, the energy consumption is minimized, the dyeing flow is increased, and the color difference between the inner and outer layers is reduced; however, if the flow is too large, it will cause energy waste and easy to channel and shift. The dyeing flow is 240m/h, and the dyeing temperature The increase can increase the kinetic energy of dye molecules in the dye bath and on the fiber, and reduce the aggregation of dye molecules in the dye bath.

At the same time, it promotes the expansion of the fiber, which is conducive to the entry of dye molecules into the fiber to achieve the purpose of uniform dyeing. As the dyeing temperature rises, the dye uptake rate increases, and the dye uptake rate is basically balanced above 95°C. Therefore, when the dyeing temperature is determined to be 95°C, slowing down the dyeing heating rate can also slow down the rate of dyeing nylon with acid dyes.

In the dyeing process of step 2, the dyeing temperature is 95° C., and the dyeing flow rate is 240 m/h.

Step 6 The temperature is controlled at 160 degrees during the scalding process.

In step 1, the warp knitted fabric layer is woven from 50% cotton, 40% polyester and 10% spandex on a warp knitting machine.

The shaping in step 1 is a pre-forming process, wherein the pre-forming temperature is 190° C. and the vehicle speed of the pre-forming process is 13.7 m/min.

In step 4, a relaxant is added during the washing process to maintain the relaxation of the surface of the fabric.

The formula of relaxation agent is: alkali 5g/L, scouring agent 10g/L and chelating agent 3g/L, washing temperature 80℃, fabric relaxation speed 13m/min.

In step 5, cationic dye is used for dyeing treatment, cationic polyester yarn is colored, polyester low elastic yarn is not colored, and the dyeing temperature is 95°C.

In step 8, 7% raising agent and 1.5% bulking agent are selected for the raising and raising.

Step 11 During the rolling process, the fabric is shaped by setting equipment, the setting temperature is 130° C., the setting speed is 10 m/min, and the overfeed is 4%.

The above are only the preferred specific embodiments of the invention, but the protection scope of the invention is not limited to this. Equivalent replacements or changes should be included within the protection scope of the invention.

Claims (10)

1. a warp knitting dyeing and finishing process is characterized in that: S1. Setting: In order to ensure the dimensional stability of the fabric, the fabric is pre-shaped to prepare for dyeing; S2. Blank inspection: The blank inspection is mainly to observe the quality of the grey fabric, whether there are any abnormalities such as drawstring, weft block, dead break, macula, and mildew; S3. Desizing: Add the spandex protective agent BFC with a mass concentration of 3g/L in the desizing process, the desizing temperature is controlled at 40-80 ℃, and the desizing time is controlled at 15min; S4. Washing: Wash with water after desizing; S5. Dyeing: add a leveling agent to the dye bath, and use an organic acid release agent to control the pH value of the dye bath to optimize the dyeing process; S6. Dehydration: the moisture content of the dyed semi-finished product is too high, and the moisture content of the cloth surface is kept uniform after dehydration, so as to prepare for the subsequent process; S7, flame retardant setting: coat a layer of adhesive paste on the surface of the fabric, and then bond a layer of flame retardant fabric on the upper surface of the adhesive paste. After the fabric is flame retardant and stereotyped, the physical and chemical properties are relatively stable ; S8. Raising: According to the production requirements of the product, control the wool height of the fabric; S9, ironing: in order to improve the appearance quality, improve the applicability of the product, adjust the feel of the fabric, make the calendered surface of the fabric more flat, and reduce the gap between the fabric fibers; S10, shearing: further improve the grade of the product, increase the added value, maintain a certain level of flatness, and shear the protrusions on the surface of the fabric; S11. Rolling: Check the quality of the finished products, classify the grades, and pack and roll them for shipment. 2 . The warp knitting dyeing and finishing process according to claim 1 , wherein the dyeing temperature in the dyeing process of step 2 is 95° C., and the dyeing flow rate is 240 m/h. 3 . 3. a kind of warp knitting dyeing and finishing process according to claim 1 is characterized in that: temperature is controlled at 160 degrees in described step 6 scalding process. 4. A warp knitting dyeing and finishing process according to claim 1, wherein in the step 1, the warp knitted fabric layer is woven from 50% cotton, 40% polyester and 10% spandex on a warp knitting machine . 5 . The warp knitting dyeing and finishing process according to claim 1 , wherein the shaping in the step 1 is a pre-forming process, wherein the pre-forming temperature is 190° C., and the speed of the pre-forming process is 13.7 m/min. 6 . . 6. A warp knitting dyeing and finishing process according to claim 1, characterized in that: in the step 4, a relaxation agent is added during the washing process to maintain the relaxation of the surface of the fabric. 7. a kind of warp knitting dyeing and finishing process according to claim 6, is characterized in that: relaxation agent formula is: alkali 5g/L, scouring agent 10g/L and chelating agent 3g/L, washing temperature 80 ℃, fabric relaxation Speed 13m/min. 8. A warp knitting dyeing and finishing process according to claim 1, characterized in that: in the step 5, cationic dyes are used in the dyeing treatment, cationic polyester yarns are colored, polyester low elastic yarns are not colored, and the dyeing temperature is 95 ℃ °C. 9 . A warp knitting dyeing and finishing process according to claim 1 , wherein: in the step 8, 7% raising agent and 1.5% bulking agent are selected for use in raising and raising. 10 . 10. A warp knitting dyeing and finishing process according to claim 1, characterized in that: in the rolling process of step 11, a shaping device is used to shape the cloth, and the shaping temperature is 130° C., the shaping speed is 10 m/min, Overfeed 4%.

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