A kind of knitted fabric free washing positioning printing process

Abstract

The present application relates to the technical field of fabric printing, and particularly relates to a knitted fabric free-washing positioning printing process. The knitted fabric free-washing positioning printing process comprises the following steps: a knitted fabric is subjected to a pretreatment process, a scanning pattern process, a pattern design process and a positioning direct spraying process in sequence; the knitted fabric comprises a pattern and a knitted formed positioning point around the pattern, the scanning pattern process is to scan a pattern contour map on the fabric after the pretreatment process; the pattern design process is to design according to the pattern contour map to obtain a design map. The process sets an integrally formed positioning point on the knitted fabric to realize accurate scanning of a subsequent pattern, then scans a pattern contour map on the fabric after the pretreatment process, and then designs according to the pattern contour map to obtain a design map. The obtained design map is accurate and clear, and no piece needs to be cut during spraying, so that free-washing positioning printing is realized, and the workload is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of fabric printing technology, specifically to a no-wash positioning printing process for knitted fabrics. Background Technology

[0002] Digital direct injection technology has become an important part of the deep processing of products in the current textile industry chain. It is an important link to showcase the quality, function and value of some textiles, and it can meet the needs of "personalization, small batch, fast delivery, many patterns and high quality".

[0003] Digital direct-to-garment (DG) technology includes traditional digital inkjet printing and UV digital direct-to-garment printing. Chinese invention patent CN109281207B discloses a method for printing napped worsted wool fabric and its preparation, which involves pre-shrinking the mesh fabric, sizing, printing, steaming, washing, and setting. This process requires washing and generates wastewater. UV digital direct-to-garment printing, on the other hand, involves pattern design, pre-shrinking the mesh fabric, cutting, pretreatment, baking, direct-to-garment printing, baking, color fixing, and baking. Both processes involve numerous steps, are time-consuming, and require a large workforce.

[0004] Most digital printing machines on the market are suitable for fabrics with relatively simple patterns. However, for fabrics with more complex patterns and different shrinkage rates in different parts, both traditional digital inkjet printing and UV digital direct-to-garment printing are prone to errors in the identification and positioning of the fabric texture. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the current cumbersome digital direct-to-garment process and the problem that printing deviations are prone to occur when applied to complex patterned fabrics.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a no-wash positioning printing process for knitted fabrics, comprising the following steps: the knitted fabric undergoes a pretreatment process, a pattern scanning process, a pattern design process, and a positioning direct printing process in sequence; The knitted fabric includes a pattern and positioning points for knitting around the pattern. The pattern scanning process is to scan the fabric after the pre-treatment process to obtain a pattern outline. The pattern design process is to design according to the pattern outline to obtain a design drawing.

[0007] The beneficial effects of this invention are as follows: Complex fabrics often use different yarn combinations depending on the pattern and part of the fabric, which can lead to varying shrinkage effects in different areas after pretreatment, making it impossible to use pre-drawn patterns for printing. To save manpower and resources, this invention sets integrated positioning points on the knitted fabric to achieve precise scanning of the subsequent pattern. The pattern outline is then scanned onto the fabric after pretreatment to obtain the design drawing. This results in an accurate and clear design drawing, and eliminates the need for cutting pieces during printing, achieving wash-free positioning printing and significantly reducing workload. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the flower shape outline according to Embodiment 1 of the present invention; Label Explanation: 1. Flower shape; 2. Positioning point. Detailed Implementation

[0009] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0010] A wash-free positioning printing process for knitted fabrics includes the following steps: the knitted fabric undergoes a pretreatment process, a pattern scanning process, a pattern design process, and a positioning direct printing process in sequence. The knitted fabric includes pattern 1 and positioning points 2 around pattern 1. The pattern scanning process is as follows: scan the fabric after the pre-treatment process to obtain the pattern outline. The pattern design process is as follows: design according to the pattern outline to obtain the design drawing.

[0011] As described above, the beneficial effects of this invention are as follows: Although a pattern design draft exists before fabric weaving, the thickness of the yarn and the weaving density affect the actual fabric produced. Furthermore, after a series of pre-processing steps, the proportions of the fabric pattern can deviate significantly. Therefore, directly using the pattern design draft for printing results in serious errors. This invention, however, uses a scanned pattern outline to design the pattern after the fabric has been pre-processed. This process saves time by eliminating the need for manual measurement of pre-shrink fabric intervals and the size of various parts, and also eliminates the need for repeated adjustments to the pattern design due to pre-shrinking, greatly reducing workload.

[0012] The knitted fabric of the present invention has an integrally formed positioning point 2 next to the pattern 1. The positioning point 2 and the greige fabric are processed together to form the knitted fabric. When used for digital printing, the positioning point 2 on the knitted fabric has the characteristics of not falling off or deforming, thus realizing accurate digital direct-to-garment printing.

[0013] Furthermore, the structure of positioning point 2 is different from that of the knitted fabric, or the yarn density of positioning point 2 is different from that of the knitted fabric.

[0014] As can be seen from the above description, and because its structure is significantly different from that of the knitted area, it can be accurately identified by digital printing equipment, thus enabling precise digital direct-to-garment printing without misalignment or displacement.

[0015] The no-wash positioning printing process for knitted fabrics of the present invention uses digital inkjet printing, which can shorten the traditional disperse dye printing process, reduce the amount of wastewater discharged from traditional disperse dye printing, and improve the color yield and color fastness of polyester printed fabrics, meeting the current requirements for energy conservation and emission reduction.

[0016] Furthermore, when the knitted fabric is used as the shoe material, the distance between positioning points 2 is less than or equal to 10cm.

[0017] As can be seen from the above description, when the knitted fabric is used as a shoe material, the jacquard density is usually high and the pattern structure of the knitted fabric itself is relatively complex. At this time, the straight-line distance between the positioning points 2 (center) is less than or equal to 10cm, which ensures that even if the knitted fabric is deformed by weft skew, the relative positional relationship between the positioning points 2 can still remain stable, providing a reliable reference point for digital printing equipment.

[0018] Furthermore, when the knitted fabric is used as the clothing material, the distance between the positioning points 2 is less than or equal to 15cm.

[0019] As can be seen from the above description, when the knitted fabric is used as clothing material, there is usually little or no jacquard structure. The positioning points 2 can be distributed relatively sparsely, 10~15cm apart, to achieve a balance between positioning accuracy and production efficiency.

[0020] Furthermore, the pretreatment process specifically includes degreasing and refining.

[0021] As described above, fabric degreasing removes surface oil stains, while scouring removes impurities from the fabric. Any known method can be used for degreasing and scouring during pretreatment.

[0022] Furthermore, the pattern scanning process scans at least one returned pattern outline.

[0023] As can be seen from the above description, scanning at least one returned flower pattern outline confirms the pattern of continuous splicing of flower pattern 1.

[0024] Furthermore, the pattern scanning process scans at least the first two rows of material.

[0025] As can be seen from the above description, in order to save waste area during fabric cutting, the fabric needs to be laid out before weaving, and there are intervals between each row. In order to confirm the complete layout pattern, at least the first two rows of the layout must be scanned during scanning.

[0026] Furthermore, in the positioning direct injection process, the distance between the nozzle and the fabric is within 10mm.

[0027] Preferably, the distance between the nozzle and the fabric in the positioning direct injection process is 1~3mm.

[0028] As can be seen from the above description, the printhead is prone to rubbing against the fabric surface. If the printhead is too high, ink splatter can easily occur, resulting in incorrect colors and unclear outlines. Therefore, the height of the printhead from the fabric should be controlled within 3mm.

[0029] Furthermore, the positioning direct printing process specifically involves: correcting the design drawing, preparing a positioning template, using the positioning template to print the sample, and if the sample printing is successful, then printing on the fabric.

[0030] As described above, the positioning template refers to a template that matches the position of the artwork with the scanned jacquard pattern. Based on the positioning template and the knitted fabric on the printing table, the camera on the printing machine is used for alignment printing. A sample print is first performed to confirm whether the pattern deviates from the jacquard pattern 1, whether the fabric is tilted, and whether the colors are correct. If the color and pattern position are confirmed to be correct, the entire roll of knitted fabric is printed according to the correct positioning template through automatic computer recognition. No washing is required after printing.

[0031] Furthermore, the correction of the design drawing specifically involves: first, performing color calibration, then replacing the calibrated color with the color of the design drawing to obtain the modified design drawing; then, performing positioning correction on the modified design drawing and the flower pattern outline drawing to obtain the corrected design drawing; and finally, creating a positioning template based on the corrected design drawing.

[0032] As described above, digital inkjet printing outputs colors via computer control. However, the colors displayed on the computer screen differ from the printing color mode, and the fabric's base color also affects the printing effect. This results in discrepancies between the printed colors and the design, necessitating color calibration (i.e., color matching). The color matching process requires gradually adjusting different process parameters based on the fabric type, color, and printing precision.

[0033] Replace the calibrated colors with the colors in the design drawing. At this point, the actual printed colors will be similar to the original colors. Position and correct the modified design drawing and the floral outline drawing to ensure that the printing position corresponds one-to-one with the jacquard position. If alignment is not possible, adjust the position of the color image according to the return-to-position rule.

[0034] Furthermore, it also includes a drying process and a color development process performed sequentially after the positioning direct injection process.

[0035] As can be seen from the above description, the drying process can improve the stability of dye ink color development; the color development process can improve the color fastness of fabric.

[0036] Furthermore, the drying process temperature is 100~150℃.

[0037] Furthermore, the drying process takes 210 seconds.

[0038] As can be seen from the above description, if the ink on the freshly printed knitted fabric is not completely dry before it is rolled up to release the color, it will cause color bleeding in the parts of the fabric that come into contact with each other.

[0039] Furthermore, the temperature of the color-developing process is less than or equal to 200°C.

[0040] Preferably, the temperature of the color development process is 100~200℃, more preferably 170~190℃.

[0041] Furthermore, the coloring process takes 3-5 minutes.

[0042] As can be seen from the above description, in order for the dye to react and adhere to the fabric, it is necessary to carry out proper vaporization to promote the diffusion of the dye ink from the surface of the fiber to the inner layer of the fiber, so that the dye ink reacts and adheres to the fiber.

[0043] Embodiment 1 of the present invention is: a no-wash positioning printing process for knitted fabrics, the specific steps of which are as follows: S1. Weaving process: Knit pattern 1 and positioning points 2 around pattern 1 to obtain knitted fabric; positioning points 2 have a mesh structure; the knitted fabric is shoe material, and the distance between positioning points 2 is 5cm. S2. Pretreatment process: Immerse the knitted fabric in water, add 2g / L of high-efficiency degreasing agent GS-1050, 1g / L of soda ash and 0.5g / L of sodium hydrosulfite, and soak at 80℃ for 20 minutes. S3, Stretching and Drying: Drying temperature is 140℃, and the operating speed is 18 yards / min; S4. Pattern Scanning Process: Place the entire roll of knitted fabric on the rollers of the printing machine, with a portion of the fabric at the top laid out horizontally on the running table. Using control buttons, move the knitted fabric laid flat on the running table to the designated area of ​​the scanning lens. Through the cooperation of the camera and the running table, extract the outline of a returned pattern and the first two rows of fabric, obtaining the pattern outline image. Figure 1 ; S5. Pattern design process: Design a color digital pattern according to the outline of the flower pattern and its proportions to obtain the design drawing; S6. Positioning direct injection process: The distance between the nozzle and the fabric is 2mm; S61. Adjust the computer settings for digital inkjet printing and perform color calibration; S62. Replace the calibrated color with the color of the design drawing to obtain the modified design drawing; S63. Accurately position and correct the modified design drawing and the flower pattern outline drawing. If the two drawings cannot be aligned, adjust the position of the design drawing according to the return to position to obtain the corrected design drawing. S64. Create a positioning template based on the corrected design drawings; S65. Use a positioning template to perform a sample printing on one of the knitted fabrics to confirm whether the pattern deviates from the jacquard pattern 1, whether the fabric is tilted, and whether the color is correct. S66. If the sample printing is successful, print the entire roll of knitted fabric according to the successful positioning template. S7. Drying process: Lay the freshly printed knitted fabric flat into the drying equipment. Set the drying equipment temperature to 130℃ and the time to 210s. S8. Color Development Process: Place the dried knitted fabric on a roller, roll it up with a guide belt, and send it into a steamer. The steamer temperature is 190℃ and the time is 4 minutes.

[0044] Embodiment 2 of the present invention is as follows: The only difference between Example 2 and Example 1 is that: in S1, positioning point 2 is a raised structure, the knitted fabric is clothing material, and the distance between positioning points 2 is 10cm; In S4, a return pattern outline and the first three rows of fabric are extracted to obtain the pattern outline diagram; in S6, the distance between the nozzle and the fabric is 10mm; in S7, the temperature of the drying process is 100℃; in S8, the temperature of the color development process is 200℃ and the time is 3min.

[0045] Embodiment 3 of the present invention is as follows: The only difference between Example 3 and Example 1 is that: in S1, positioning point 2 is a recessed structure, the knitted fabric is shoe material, and the distance between positioning points 2 is 10cm; in S4, the three returning flower outlines and the first four rows of fabric are extracted, and the weft skew of the bottom fabric is controlled at 2% to obtain the flower outline; in S6, the distance between the nozzle and the fabric is 2.5mm; in S7, the temperature of the drying process is 150℃; in S8, the temperature of the color developing process is 100℃ and the time is 5min.

[0046] Embodiment four of the present invention is as follows: The only difference between Example 4 and Example 1 is that the yarn density of positioning point 2 in S1 is different from that of the knitted fabric. The knitted fabric is clothing material, and the distance between positioning points 2 is 15cm. In S4, the four return pattern outlines and the first two rows of fabric are extracted to obtain the pattern outline diagram. In S6, the distance between the nozzle and the fabric is 1mm. In S7, the temperature of the drying process is 120℃. In S8, the temperature of the color development process is 180℃ and the time is 4min.

[0047] In summary, the no-wash positioning printing process for knitted fabrics provided by this invention has the following advantages: 1. Digital inkjet printing is used to achieve wash-free positioning printing, which reduces wastewater discharge, increases color yield and color fastness, and saves energy and reduces emissions; 2. Scan the fabric after the pretreatment process to obtain the pattern outline, and then design according to the pattern outline to obtain an accurate and clear design drawing, which reduces the workload. 3. Further improve the accuracy of the design drawings through color calibration and positioning correction; 4. By developing color, the dye ink reacts and is fixed on the fiber, thus improving color fastness.

[0048] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A no-wash positioning printing process for knitted fabrics, characterized in that, Includes the following steps: The knitted fabric undergoes a series of processes, including pretreatment, pattern scanning, design, and direct injection molding. The knitted fabric includes a pattern and positioning points for knitting around the pattern. The pattern scanning process is to scan the fabric after the pre-treatment process to obtain a pattern outline. The pattern design process is to design according to the pattern outline to obtain a design drawing.

2. The no-wash positioning printing process for knitted fabrics according to claim 1, characterized in that, The pretreatment process specifically includes degreasing and refining.

3. The no-wash positioning printing process for knitted fabrics according to claim 1, characterized in that, The pattern scanning process scans at least one returned pattern outline.

4. The no-wash positioning printing process for knitted fabrics according to claim 1, characterized in that, The pattern scanning process scans at least the first two rows of material.

5. The no-wash positioning printing process for knitted fabrics according to claim 1, characterized in that, In the positioning direct injection process, the distance between the nozzle and the fabric is within 10mm.

6. The no-wash positioning printing process for knitted fabrics according to claim 1, characterized in that, The positioning direct printing process specifically involves: correcting the design drawing, preparing a positioning template, using the positioning template to print the sample, and if the sample printing is successful, then printing on the fabric.

7. The no-wash positioning printing process for knitted fabrics according to claim 6, characterized in that, The correction of the design drawing specifically involves: first, performing color calibration, then replacing the calibrated color with the color of the design drawing to obtain the modified design drawing; then, performing positioning correction on the modified design drawing and the flower outline drawing to obtain the corrected design drawing; and finally, creating a positioning template based on the corrected design drawing.

8. The no-wash positioning printing process for knitted fabrics according to claim 1, characterized in that, It also includes the drying process and the coloring process that are carried out sequentially after the positioning direct injection process.

9. The no-wash positioning printing process for knitted fabrics according to claim 8, characterized in that, The temperature of the drying process is 100~150℃.

10. The no-wash positioning printing process for knitted fabrics according to claim 8, characterized in that, The temperature of the color-developing process is less than or equal to 200°C.

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