WO2019051939A1 - Multicolor gradient digital yarn knitted fabric and preparation method therefor - Google Patents

Abstract

A method for preparing a multicolor gradient digital yarn knitted fabric, comprising the following steps: A) a yarn producing process: cyan cotton fiber, magenta cotton fiber, and yellow cotton fiber are used as raw materials for roving spinning, a digital spinning machine is used for spinning yarn, the amount of change in the gradient blending ratio of different colors is 15%, the change length at each ratio is 10 cm; and plying is conducted on 30S spun gradient yarn and 30S pure yellow yarn; and B) a knitting process using a flat knitting machine: knitting is conducted on a computer flat knitting machine, fabric weave of single-face plain stitch type is used for the fabric; and the coursewise density is 62.5/10 cm, and the walewise density is 39/10 cm. The fabric has a unique style, rich gradation and a good three-dimensional effect, is fashionable, and has a wide application prospect.

Description

Colorful gradient digital yarn knitted fabric and preparation method thereof Technical field

The invention relates to the technical field of textiles, in particular to a colorful gradient digital yarn knitted fabric and a preparation method thereof.

Background technique

Since the 1980s, knitwear has become increasingly popular throughout the world, and the world of apparel has shown a trend toward knitwear. As the main raw material of knitted garments, knitted fabrics have the commonality of knitted garments and unique characteristics. They are unique in style with their soft, comfortable, body-fit and elastic properties. Especially in the new century, the leisure and fashion of knitted fabrics conform to the changes of people's lifestyles. The development of raw materials to natural and environmental protection, and the development of fabrics to functionalization have become more and more important in the modern garment industry. An indispensable part of modern people's dressing style has broad development prospects and huge business opportunities.

In recent years, with the development of intelligent control technology, it has become a trend to use various types of fancy yarns to woven into fabrics. From the current development of fancy yarns at home and abroad, diversified raw materials and structural composites are two major development trends. Traditional fancy yarns are based on different yarns such as parallel yarn, slub yarn, corrugated yarn and loop yarn. The structure is alternately used or mixed with fibers with special properties, and the multi-color combination allows the yarn to be composited, which makes the product more colorful. Multi-component fiber composite yarn forming technology is the key to the successful development of ring-spun fancy yarn products. From the perspective of domestic and foreign materials and display equipment, one form of multi-component coupled yarn is segmental yarn. Feeding colored or colorless fiber strips at the rear of the multi-color draw-down card comb, feeding four positions from the side of the fuselage, using a computer program controller to control the color matching of the four stepper motor drives Roller speed, to achieve segmental color matching, into a segment of color bars, and then into a segment of colored yarn. The process can realize multi-color color matching in the same process, but the process has certain requirements on fiber length and fiber type, and is suitable for the needle comb drawing processing method, and the length of the color segment is long after the wool fiber strip is drawn by the subsequent process. The product has a large limitation; the decorative yarn color strip is fed at four different points in the longitudinal direction of the base strip. To achieve the head-to-tail connection of any color matching at each point, it is difficult to formulate and change the process.

At present, there are three main methods for producing segmental yarns in China:

1, draw frame segment feeding method

The draw frame feeding method is mainly applied to wool spinning. Imitation of foreign equipment in the drawing process using a computer The program controls the frequency conversion or the servo motor, and the multi-point position feeds the colored fiber strips in sections to form a segmented color top. This method is suitable for the wool fiber with a long fiber length, and the draw frame is a needle combing machine. After the product is processed by the subsequent process, the length of the segment color is longer.

2, spinning machine three roller drawing method

In the spinning process, the three-roller drafting mechanism of the spinning frame is simply modified, the main core yarn is fed from the middle roller, the auxiliary yarn is fed from the rear roller, and the auxiliary yarn is intermittently fed by electric or mechanical means, the trunk The core yarn and the auxiliary yarn are gathered at the middle roller jaws to achieve the segment color effect.

3. Four-roller drawing method for spinning frame

On the basis of the three rollers, a rubber roller is added to the rear roller, the three roller and the four roller. The rubber roller is used to hold the two rovings fed, the main core yarn is fed from the four rollers, and the auxiliary yarn is from three. The roller is fed, the roving strip is controlled by the step rubber roller, passes over the smaller diameter end of the step rubber roller, and the roving whisker passes over the smaller diameter end of the step rubber roller, is controlled by the step rubber roller, and the program controller Control the servo motor, make the three-roller and four-roller step-variable drive, gather in the main draft of one roller and two roller to realize the effect of segment color yarn; the principle of segment color control and the spinning effect and the three-roller drawing method Similarly, the difference is that the speed of the three roller and the four roller can be increased, the main yarn increases the rear zone drafting control, and the dryness of the yarn is relatively good, but the holding points of the roving of the three roller and the four roller are relatively The spacing of the two rollers is not the same. It is not suitable for the drafting of cotton fiber strips. At the same time, the holding points of the rovings of the three rollers and the four rollers are not at the same point of feeding the length of the roving, and cannot be synchronized and controlled by the same position. Yarn drying, craft The whole complex. Although the four-roller method can spin a relatively uniform segment of colored yarn, the blending ratio of the main and auxiliary yarns is limited by the quantitative of the main and auxiliary rovings and the draw ratio of the rear zone.

Summary of the invention

The object of the present invention is to provide a colorful gradual digital yarn knitted fabric and a preparation method thereof, which can improve the material level of the final fabric and meet the practical application requirements.

The main problem of the prior art is that the spinning mechanism needs to be modified when spinning the grading yarn, and secondly, the quality blending ratio of the different feeding channels cannot be changed in real time during spinning. The invention improves the drafting mechanism of the ordinary ring spinning rear zone, and can feed three rovings at the same time, and the respective draw ratios of the rear zone can be independently controlled. The blending ratio change, the change length, and the weaving process are all conventional means, but the amount of change and the length of change are given as good process merits based on multiple trial spinning experiments, and the significant effect is woven into The fabric color transitions naturally and is not unobtrusive.

According to a first aspect of the present invention, a method for preparing a colorful gradation digital yarn knitted fabric is provided, including The following steps:

A) Yarn production process: the roving strips are spun from cotton fibers of cyan, magenta and yellow. The yarns are spun by a digital spinning machine. The variation of the blending ratio of different colors is 15%. a ratio of change in length of 10cm; gradient spun yarn 30 ^S and 30 ^S simultaneously plied yarn and pure yellow line;

B) Flat knitting process: Weaving on a computerized flat knitting machine, the fabric is made of a single-sided flat needle; the transverse density: 62.5/10cm; the longitudinal density: 39/10cm.

Preferably, in the step A, one of the color rovings is fixed, and the ratio of the remaining two color rovings is dynamically adjusted, and the color change gradient is set to 15%, that is, the ratio is changed from 85%: 15% to 15%: 85%, then changed back to 85%: 15%, the length of each ratio varies by 10cm.

Preferably, in the step A, the three colors of cotton fibers of cyan, magenta and yellow are firstly obtained by grasping, mixing, opening, rolling, carding, drawing, and roving, respectively, and then forming roving strips; Three different color rovings were simultaneously fed into a digital spinning machine that was drafted and modified in the back zone for spinning.

Preferably, in the step A, in the control of the digital spinning machine, the spinning speed is determined to be 7000 r/min, and the servo motor is used to adjust the color blending ratio of different spinning segments.

Preferably, in the step A, before the spinning of the roving strip, the pre-spinning process is further included: color fiber→opening cotton→carding→pre-striping, strip-and-rolling→combing→striping (2 lanes).

Preferably, in the step A, the raw cotton is dyed, and the physical properties of the original cotton are dyed, and the physical properties of the fiber are decreased. During the opening process, the effect of “slowing down and gradually opening” should be followed to achieve the effect of less damage to the fibers. The impurity removal process is similar to the spinning ordinary white yarn process, and the process of prematurely dropping impurities is used to prevent the impurities from being broken during the processing, and it is more difficult to remove. In order to ensure the thorough mixing and uniform transportation of the color fiber, a stable supply is provided, and two cotton boxes (supply machines) are arranged in the opening and cleaning process. The dyed fiber is dyed and washed with water, and the impurities contained in the fiber are reduced. In the open cleaning process, three opening points are arranged, and the opener is usually opened by the opener and the cotton cleaner.

Open cleaning machine configuration:

FA002 (2 units) → FA121 → FA104 → FA022 → FA106 → A062 → A092AST → FA141

After the fiber is dyed, the physical and mechanical properties are degraded. In the process of opening the cotton, the speed of the tapping machine is appropriately reduced, which can reduce the fiber damage and reduce the amount of neps. The distance between the dust bars of the opener is from the inlet to the outlet. Reduced. Due to the high cost of the color fiber, the cleaning and carding process is carried out, and the cotton removal rate is appropriately reduced on the basis of improving the efficiency of the single machine. The drop rate is controlled at 70-75% of the raw cotton.

Preferably, in the step A, the combing preparation process adopts: pre-adhesive (6)→ strip and roll (28). With this process, the lap is relatively uniform in the transverse direction, the fiber has a certain diffusion, and the small volume is quantitatively heavy, which can improve the output of the comber and at the same time facilitate the removal of the linters.

Preferably, in the step A, the roving process configuration: the spinning frame has a strong drafting ability due to the low number of spun yarns, and the roving drafting is small (6.1 to 7.5), and the roving is appropriately selected ( 3.5～4.5g/10m), the roving twist coefficient is small (85～91), which is beneficial to improve the quality of the roving and save the roving machine.

Preferably, in the step A, the middle and rear roller center distances are set to 65 mm; the roller pressure is set to 180*120*140 N/double ingots before, during and after, and the spindle speed is 7000 r/min.

Preferably, in the step B, the needle number is: 12G. Yarn: 30 ^S /2 strands. Weight: 293 g / square meter.

Preferably, in the step B, the fabric is woven by a computerized flat knitting machine, and the yarn is first lubricated and waxed to improve the smoothness of the yarn and optimized by tension (50-60 cN). Therefore, the yarn breakage caused by the knotting of the yarn during the weaving process is avoided, resulting in unevenness of the fabric coil and the occurrence of streaks.

More preferably, after step B, the method further includes the following steps:

Nesting → flat car → hand sewing → washing → drying → ironing → packaging → storage.

More preferably, the specific process flow of the preparation method of the colorful gradient digital yarn knitted fabric comprises:

A) Yarn production process: cotton picking→mixing→opening→rolling→combing→combing preparation→combing drawing→roving (three colors)→spun yarn (colorful gradient digital yarn);

B) Fabric production process: colorful gradient digital yarn → doubling → rewinding → woven sheet → hood → flat car → hand sewing → washing → drying → ironing → packaging → storage.

According to a second aspect of the present invention, a colorful progressive digital yarn knitted fabric is provided, and the colorful progressive digital yarn knitted fabric is prepared by any of the above preparation methods.

Compared with the prior art, the advantages of the invention are:

(1) Spinning process: the spinning of the yarn is carried out by the digital spinning machine after the post-zone drafting transformation, and the gradient of the blending ratio of the three colors in the twisted triangle is dynamically adjusted to realize the gradient of the yarn appearance color. effect. And the yarn is spliced into yarn to meet the requirements of the yarn and the performance of the fabric.

(2) Rear roller numerical control technology: It adopts high-precision dynamic control of the draft ratio of different color rovings in the spinning time with the time as the variable, while keeping the total drafting constant constant.

(3) Use computer flat knitting machine for fabric weaving. The developed product dynamically adjusts the ratio of the blending of three different color rovings to obtain the color grading effect of the yarn in its length direction. The whole production process does not need dyeing, environmental protection and energy saving, and the woven fabric has unique style and rich layers. It has a strong sense of three-dimensionality and fashion, and has broad application prospects.

Detailed ways

The specific embodiments provided by the present invention will be described in detail below with reference to the embodiments.

Example 1

Specific process flow:

Yarn production: cotton picking→mixing→opening→rolling→combing→combing preparation→combing drawing→roving (three colors)→spun yarn (colorful gradient digital yarn);

Fabric production: colorful gradient digital yarn → doubling → rewinding → woven sheet → hood → flat car → hand sewing → washing → drying → ironing → packaging → storage.

(1) Yarn design

In order to make the developed products not only have good hand feeling, moisture absorption, softness and other performance requirements, but also have a gradual rich layer, but also have a stylish, casual, generous appearance style, using cotton fiber as raw material, while using green, magenta and Yellow three-color cotton fiber is mixed and spun to highlight its style.

In the rendering of the gradient effect, the gradient blending ratio is changed, and the blending coloring effect at the fiber scale is optimized.

In the trial spinning process, multiple schemes were designed for the blending ratio of the three colors:

Option 1: Fix another roving, dynamically adjust the ratio of the other two colors of roving, set the color change gradient to 15%, that is, the ratio changes from 85%: 15% to 15%: 85%, then back to 85%. : 15%, the change length of each ratio is 10cm.

Option 2: Set the gradient of the gradient color to 10%, fix one of the rovings, and adjust the ratio of any two other rovings, that is, the ratio is changed from 10%:10%:80% to 10%:80%:10 %, then change to 10%: 10%: 80%, the change length of each ratio is 6cm.

Comparing the trial spinning experiments of Scheme 1 and Scheme 2, the yarn grading effect and the overall color mixing effect of the scheme 1 are better than the scheme 2, that is, the yarn spun from the scheme 1 and the gradation rule thereof can more express the gradient. The characteristics of the fabric, while meeting the requirements of fabric processing and taking, so the final selection of Scheme 1 for yarn spinning. In the color dynamic change, the blending ratio is controlled by a blending ratio of 15%.

(2) Spinning process design

The traditional mixed yarn spinning process is to mix the fiber materials of different colors or properties in the cotton picking or drawing process, and then make the roving and then spin. However, the yarn produced by this method cannot achieve a short segment gradation of its color in the length direction. To this end, in the yarn spinning process of this product, the three colors of cotton fibers of cyan, magenta and yellow are firstly obtained by grasping, mixing, opening, rolling, carding, drawing, and roving processes. The roving strip; then three different color rovings are simultaneously fed into the yarn spinning machine which is drafted by the rear zone for spinning, and the grading process is preferred.

The yarn is spun by a digital spinning machine. The variation ratio of different color gradient blending is 15%, that is, the ratio of color blending ratio is changed from 85%: 15% to 15%: 85%, and then back to 85%: 15%. The variation of the ratio is 10 cm. In the control of the digital spinning machine, the spinning speed is determined to be 7000r/min, and the servo motor is used to adjust the color blending ratio of different spinning segments. In order to improve the gradation effect, the 30 ^S gradient yarn is simultaneously conjugated with 30 ^S pure yellow yarn.

Since the fibers used in the yarn-spun yarn are dyed by the fiber and then subjected to the spinning process, and the fiber dyeing has certain damage to the physical and mechanical properties of the fiber, the process of the spinning process of the color spinning yarn is directed to this case. The setting is different from ordinary white spinning yarn. Color-spun yarn products are usually oriented to the mid-to-high-end market, so the cotton blending grade of the raw material is usually slightly higher than the ordinary yarn of the same yarn count to compensate for the fiber damage caused by fiber dyeing, resulting in a decrease in the spinnability of the dyed fiber and physical The performance is declining.

Front spinning process configuration:

Color fiber → open cotton → carding → pre-parallel, strip and roll → combing → draw (2).

Spinning is a systematic project. Opening cotton is the starting point of cotton spinning engineering and one of the key processes to determine the quality of cotton spinning engineering. The process of opening the cotton cleaning process should be scientific and reasonable, so that the production can be carried out according to the optimal process and process conditions.

Using raw cotton dyeing, because the cotton fiber is not fully opened, the cotton fiber dyed by the same dyeing cylinder will have a certain color difference. At the same time, the fiber dyed by different dyeing cylinders will have a certain cylinder difference. In the cotton-scissing process, the packaging and mixing of the colored fibers also need to be paid attention to in order to solve the chromatic aberration and improve the uniformity.

Table 1. Performance indicators of dyed fibers

After the raw cotton is dyed, the physical properties of the fiber are degraded. During the opening process, the effect of “slowing down the play and gradually opening the looseness” should be followed to achieve the effect of less damage to the fiber. The impurity removal process is similar to the spinning ordinary white yarn process, and the process of using the early impurities is adopted to prevent the impurities from being broken during the processing, and it is more difficult to remove. In order to ensure the thorough mixing and uniform transportation of the color fiber, a stable supply is provided, and two cotton boxes (supply machines) are arranged in the opening and cleaning process. The dyed fiber is dyed and washed with water, and the impurities contained in the fiber are reduced. In the open cleaning process, three opening points are arranged, and the opener is usually opened by the opener and the cotton cleaner.

Open cleaning machine configuration:

FA002 (2 units) → FA121 → FA104 → FA022 → FA106 → A062 → A092AST → FA141

After the fiber is dyed, the physical and mechanical properties are degraded. In the process of opening the cotton, the speed of the tapping machine is appropriately reduced, which can reduce the fiber damage and reduce the amount of neps. The distance between the dust bars of the opener is from the inlet to the outlet. Reduced. Due to the high cost of the color fiber, the cleaning and carding process is carried out, and the cotton removal rate is appropriately reduced on the basis of improving the efficiency of the single machine. The drop rate is controlled at 70-75% of the raw cotton.

The dyed fiber is more likely to form short velvet in the carding process than the original cotton, and the speed of the licking roller of the carding machine is appropriately reduced, the holding pre-carding action is reduced, and the fiber damage is reduced. At the same time, the speed of the cylinder can be kept at the same speed as that of ordinary white yarn. The decrease of the speed of the cylinder will reduce the number of needles acting on the fiber per unit time, reduce the combing effect, and reduce the speed of the cylinder, which will increase the combing load of the cylinder. The fiber is easy to twist on the needle surface to form a neps, and the speed of the cylinder is also unfavorable for the discharge.

The combing preparation process is: pre-adhesive (6) → strip and roll (28)

With this process, the lap is relatively uniform in the transverse direction, the fiber has a certain diffusion, and the small volume is quantitatively heavy, which can improve the output of the comber and at the same time facilitate the removal of the linters.

Roving process configuration:

Due to the low number of spun yarns, the spinning machine has a strong drafting capacity, so the roving draft is too small (6.1 to 7.5), the roving is appropriately selected (3.5 to 4.5 g/10 m), and the roving coefficient is small. Mastering (85-91) is beneficial to improve the quality of the roving and save the roving machine.

Spinning process configuration:

In the spinning process, the drawing yarns of the three drafting channels are dynamically changed, and the total drafting ratio and the drafting ratio of the rear zone are large. It is necessary to synthesize various factors to formulate the process, and the requirements for the spinning process are high.

Post-drafting zone process: Due to the dynamic change of the drafting ratio in the rear zone of each channel, and the variation range is large, the rear zone needs to bear a large draft, the roving twist in the rear drafting zone is high, and the cohesion between the fibers Larger, It is necessary to appropriately increase the center distance of the rear drafting zone roller, and set the center distance of the middle and rear rollers to be 65 mm.

The total drafting ratio and the drafting ratio of the rear zone are both large, and the roller pressure is too large to be controlled, and the pressure is set to 180*120*140N/double ingot before, during and after. The apron adopts elastic jaws, taking into account the amount of fiber in the drafting zone. When the drafting ratio is low and the fiber volume is large, the hard head cannot be produced. When the drafting ratio is high and the fiber amount is small, the fiber is effectively controlled. The ring jaws are moderately controlled, with a 3.0 gauge block. Spinning graded yarn, dynamic change draft ratio, spindle speed 7000r/min is much lower than ordinary white spinning. The spinning process parameters are shown in Table 2.

Table 2 Spinning process parameters

Front zone draft	Total draw 1	Total draft 2	Total draft 3
25.77	30.92	247.4	247.4
29.45	35.34	123.7	247.4
34.36	41.23	82.47	247.4
41.23	49.48	61.85	247.4
41.23	61.85	49.48	247.4
34.36	82.47	41.23	247.4
29.45	123.7	35.34	247.4
25.77	247.4	30.92	247.4
29.45	247.4	35.34	123.7
34.36	247.4	41.23	82.47
41.23	247.4	49.48	61.85
41.23	247.4	61.85	49.48
34.36	247.4	82.47	41.23
29.45	247.4	123.7	35.34
25.77	247.4	247.4	30.92
29.45	123.7	247.4	35.34
34.36	82.47	247.4	41.23
41.23	61.85	247.4	49.48
41.23	49.48	247.4	61.85
34.36	41.23	247.4	82.47

(3) Flat knitting machine technology

The product of the invention is woven by computerized flat knitting machine, and is mainly optimized for the yarn tension of the computerized flat knitting machine (50-60 cN), thereby avoiding yarn breakage caused by yarn knotting during the knitting process, thereby causing unevenness of the fabric coil. , there is a shadow and so on. The specific method is to first lubricate and wax the yarn to improve the smoothness of the yarn, and adopt a new type of yarn storage device to strictly control the tension, so as to avoid yarn breakage caused by uneven yarn gravity. , 瑕疵 and other issues.

The product of the present invention employs a woven fabric structure as a single jersey needle. Horizontal density: 62.5/10cm; longitudinal density: 39/10cm. Needle number: 12G, weaving on a computerized flat knitting machine. Yarn: 30 ^S /2 strands. Weight: 293 g / square meter. The fabric prepared by the invention has soft and firm hand feeling, rich color change, distinct layers, and has a three-dimensional effect and a illusion effect.

Finished product test results:

Tested by the National Textile Product Quality Supervision and Inspection Center (Jiangyin): the product quality meets the requirements of FZ/T73010-2008 "Knitting Craft Shirt", and the product safety conforms to GB 18401-2010 "National Textile Product Basic Safety Technical Specification" Standard B Class requirements; details as follows:

Water fastness: 4-5 (technical requirement 3); acid fastness: 4-5 (technical requirement 3); alkali fastness: 4-5 (technical requirement 3) . Rubbing fastness: dry friction: 4-5 (technical requirements level 3). No formaldehyde was detected (technical requirements less than 75 mg/kg).

The invention selects the raw material selection, the yarn design, the spinning technical parameter optimization and the flat knitting machine process optimization, and finally successfully develops the colorful gradient digital yarn knitted fabric. According to the relevant standards, the developed products have not detected formaldehyde, and have good environmental protection characteristics; the color fastness to washing and the rubbing fastness are higher than the standard, reaching the standard of the National Textile Products Basic Safety Technical Specifications, in line with B Class safety requirements, product quality level meets the requirements of the first class of "Knitting Craft Shirt". The production process of the product is feasible, the product quality and function have reached the domestic advanced level, and it has been mass-produced, and achieved good economic and social benefits.

The preferred embodiments of the present invention have been specifically described above, but the present invention is not limited to the embodiments, and those skilled in the art can make various equivalents without departing from the inventive spirit of the present invention. Modifications or substitutions of the invention are intended to be included within the scope of the appended claims.

Claims (8)

1. A method for preparing a colorful gradient digital yarn knitted fabric, comprising the steps of:

   A) Yarn production process: the roving strips are spun from cotton fibers of cyan, magenta and yellow. The yarns are spun by a digital spinning machine. The variation of the blending ratio of different colors is 15%. a ratio of change in length of 10cm; gradient spun yarn 30 ^S and 30 ^S simultaneously plied yarn and pure yellow line;

   B) Flat knitting process: Weaving on a computerized flat knitting machine, the fabric is made of a single-sided flat needle; the transverse density: 62.5/10cm; the longitudinal density: 39/10cm.
2. The method for preparing a colorful gradation digital yarn knitted fabric according to claim 1, wherein in the step A, the three colors of cyan, magenta and yellow cotton fibers are firstly grasped, mixed, opened, and The roving strips are respectively formed after the winding, carding, drawing and roving processes; then, the three different color rovings are simultaneously fed into the digital spinning machine which is drafted by the rear zone for spinning.
3. The method for preparing a colorful gradation digital yarn knitted fabric according to claim 1, wherein in the step A, before the roving strip is spun, the pre-spinning process is further included: color fiber → open cotton → carding → pre- Parallel, strip and roll → combing → 2 draws.
4. The method for preparing a colorful progressive digital yarn knitted fabric according to claim 1, wherein in the step A, the roving draft is 6.1 to 7.5, the roving is quantitatively 3.5 to 4.5 g/10 m, and the roving twist coefficient is 85 to 91. .
5. The method for preparing a colorful progressive digital yarn knitted fabric according to claim 1, wherein in the step A, the center distance of the middle and rear rollers is set to 65 mm; and the roller pressurization is set to press before, during, and after. 180*120*140N/double spindle, spindle speed 7000r/min.
6. The method for preparing a colorful gradation digital yarn knitted fabric according to claim 1, wherein in the step B, the needle number is: 12G; the yarn: 30 ^S /2 strands; and the gram weight: 293 g/ Square meters; yarn tension 50 ~ 60cN.
7. The method for preparing a colorful progressive digital yarn knitted fabric according to claim 1, wherein in the step B, the yarn is first lubricated and waxed.
8. A colorful progressive digital yarn knitted fabric, characterized in that the colorful progressive digital yarn knitted fabric is prepared by the preparation method according to any one of claims 1-7.