A digital stamping method

Abstract

The application provides a digital discharge printing method and belongs to the technical field of textiles. The application provides a digital discharge printing method, which comprises the following steps: sequentially performing digital discharge printing and post-treatment on dyed fabric to obtain digital discharge printing fabric; the digital discharge printing is color-white discharge printing at the same time or color discharge printing after white discharge printing; the color-white discharge printing at the same time is simultaneous printing of color ink, white ink and discharge printing ink; and the color discharge printing after white discharge printing is white ink printing first, and then simultaneous printing of color ink and discharge printing ink. The application limits the digital discharge printing to color-white discharge printing at the same time or color discharge printing after white discharge printing, so that the printing precision and resolution are improved.

Description

Technical Field

[0001] This invention relates to the field of textile technology, and more particularly to a digital discharge printing method. Background Technology

[0002] Discharge printing, also known as stencil printing or "acid painting" in folk terms, is a printing process that uses a paste containing reducing or oxidizing agents to locally destroy the base dye on dyed fabrics to form patterns. Discharge printing can be divided into two categories: white discharge (exposing the white base pattern) and color discharge (revealing the colored pattern), or simply discharge printing. Its principle is to use strong reducing agents such as stencil powder to destroy the molecular structure of the base dye, use anthraquinone to enhance the reaction efficiency, and use an alkali agent to dissolve and decompose the products to remove the floating dye.

[0003] The related technology discloses a textile pretreatment process with good results for digital inkjet discharge printing technology, applicable to fabrics such as cotton, linen, viscose, and silk. It enables the treated fabric to be inkjet printed on an inkjet printer using water-soluble discharge ink. After appropriate heat treatment, the discharged-printed fabric will produce a discharge pattern, resulting in inkjet-printed discharge fabric with good discharge effect and wide applicability. However, it still suffers from low printing accuracy and resolution. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide a digital discharge printing method. The digital discharge printing method provided by this invention has high printing accuracy and resolution.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a digital printing method, comprising the following steps: The dyed fabric is subjected to digital discharge printing and post-treatment in sequence to obtain digital discharge printed fabric. The digital discharge printing is performed by discharge of color and white simultaneously or by discharge of white first and then color. The simultaneous printing of color ink, white ink, and discharge printing ink is described as printing simultaneously using color ink, white ink, and discharge printing ink. The "white-then-color discharge printing" method involves first printing with white ink, and then simultaneously printing with colored ink and discharge printing ink.

[0006] Preferably, when the dyed fabric is a light-colored fabric or a dark-colored fabric that has been fixedly dyed, the digital discharge printing is a simultaneous discharge of color and white, the light-colored fabric has an owf of 0.1% to 1%, and the dark-colored fabric has an owf greater than 1%.

[0007] Preferably, the printing speed of the color-white printing is 200~600m / h.

[0008] Preferably, the dyed fabric is sized before digital discharge printing, and the sizing is done using a sizing solution.

[0009] Preferably, the sizing liquid includes a thickener, and the mass percentage of the thickener in the sizing liquid is 0.5% to 2%.

[0010] Preferably, the sizing and digital discharge printing are carried out in a combined screen printing machine and digital discharge printing machine, wherein the screen printing machine in the combined screen printing machine and digital discharge printing machine is a flat screen machine or a rotary screen machine, and the sizing is carried out in the screen printing machine.

[0011] Preferably, the post-treatment is steaming or pressing.

[0012] Preferably, the steam temperature is 100~110℃, saturated steam is used, and the time is 6~10 minutes.

[0013] Preferably, the pressing temperature is 170~180℃, the time is 10~15s, and the pressure is 0.3~0.4MPa.

[0014] Preferably, the post-processing further includes screen printing on the fabric after digital discharge printing.

[0015] This invention provides a digital discharge printing method, comprising the following steps: digitally discharge printing and post-processing of dyed fabric sequentially to obtain digitally discharge printed fabric; the digital discharge printing is either simultaneous color and white discharge printing or white discharge printing followed by color discharge printing; simultaneous color and white discharge printing means printing with colored ink, white ink, and discharge printing ink at the same time; white discharge printing followed by color discharge printing means printing with white ink first, and then printing with colored ink and discharge printing ink simultaneously.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention limits digital discharge printing to simultaneous discharge of color and white or discharge of white first and then color, thereby improving printing accuracy.

[0017] Furthermore, the sizing and digital discharge printing described in this invention are carried out in a combined screen printing machine and digital discharge printing machine. A flat screen device (flat screen) is connected in front of the digital discharge printing machine, or a rotary screen device (rotary screen) is connected in front of the digital discharge printing machine. The flat screen or rotary screen is synchronized with the digital discharge printing machine through a PLC program. A single screen is prepared by separating the image layers to achieve the purpose of sizing the printing area separately, without sizing the entire roll of fabric, thus reducing raw material costs.

[0018] Furthermore, the post-processing of the present invention also includes screen printing on the fabric after digital discharge printing to achieve multiple functional finishing of the fabric. Attached Figure Description

[0019] Figure 1 This is a photograph of the finished fabric obtained in Example 1; Figure 2 This is a photograph of the finished fabric obtained in Example 2; Figure 3 This is a photograph of the finished fabric obtained in Example 3; Figure 4 This is a photograph of the finished fabric obtained in Example 4; Figure 5 This is a photograph of the finished fabric obtained in Example 5; Figure 6 This is a photograph of the finished fabric obtained in Example 6; Figure 7 A photograph of the finished fabric obtained in Example 7; Figure 8 This is a photograph of the finished fabric obtained in Example 8. Detailed Implementation

[0020] This invention provides a digital printing method, comprising the following steps: The dyed fabric is subjected to digital discharge printing and post-treatment in sequence to obtain digital discharge printed fabric. The digital discharge printing is performed by discharge of color and white simultaneously or by discharge of white first and then color. The simultaneous printing of color ink, white ink, and discharge printing ink is described as printing simultaneously using color ink, white ink, and discharge printing ink. The "white-then-color discharge printing" method involves first printing with white ink, and then simultaneously printing with colored ink and discharge printing ink.

[0021] Unless otherwise specified, all raw materials and equipment used in this invention are commercially available products in the field.

[0022] In this invention, the dyed fabric is preferably one or more of cotton, linen, viscose, and silk fabrics.

[0023] In this invention, the dyed fabric is preferably sized before digital discharge printing to obtain sized dyed fabric, and then digital discharge printing is performed. The sizing is preferably done with a sizing solution. This invention does not have any special limitation on the composition of the sizing solution, and any composition known to those skilled in the art can be used.

[0024] In this invention, the sizing liquid preferably further includes a thickener, and the mass percentage of the thickener in the sizing liquid is preferably 0.5% to 2%, specifically 0.5%, 1%, 1.5% or 2%.

[0025] In this invention, the sizing and digital discharge printing are preferably performed in steps or simultaneously. When performed in steps, the sizing is preferably performed in a setting machine, and the digital discharge printing is preferably performed in a digital discharge printing machine. When performed simultaneously, the sizing and digital discharge printing are preferably performed in a combined screen printing machine and digital discharge printing machine. The screen printing machine in the combined screen printing machine and digital discharge printing machine is preferably a flat screen machine or a rotary screen machine. The sizing is preferably performed in the screen printing machine. Preferably, the flat screen or rotary screen and the digital discharge printing machine are synchronized through a programmable logic controller (PLC) program. By separating the image layers to prepare a single screen, the printing area is sizing separately, eliminating the need to sizing the entire roll of fabric and reducing raw material costs. After the sizing is completed in the screen printing machine, the digital discharge printing is performed directly.

[0026] In this invention, when the sizing is performed in a setting machine, the amount of the sizing solution is preferably 10 wt% of the dyed fabric and the sizing solution does not contain a thickener.

[0027] In this invention, the finishing rate of the finishing machine is preferably 60%, preferably one dip and one roll, the temperature is preferably 130~160℃, specifically 130, 140, 150 or 160℃, the machine speed is preferably 15~30m / min, specifically 15, 20, 25 or 30m / min, and the sized and dyed fabric is unloaded and ready for use.

[0028] In this invention, when the sizing is preferably performed in a screen printing machine, the amount of the sizing solution is preferably 10 wt% of the dyed fabric and the sizing solution contains a thickener.

[0029] After obtaining the sized and dyed fabric, the present invention sequentially performs digital discharge printing and post-processing on the sized and dyed fabric to obtain a digitally discharged fabric; the digital discharge printing is either color and white discharge printing simultaneously or white discharge printing followed by color discharge printing; the color and white discharge printing simultaneously means that color ink, white ink, and discharge printing ink are printed at the same time; the white discharge printing followed by color discharge printing means that white ink is printed first, and then color ink and discharge printing ink are printed simultaneously.

[0030] The following describes the scheme for simultaneous output of color and white.

[0031] The present invention preferably processes the image using a professional layer tool, and then uses the color ink, white ink, and discharge ink of a belt-type digital printer to achieve simultaneous ink output and printing.

[0032] In this invention, the professional layer tool is preferably RIP or Neostampa.

[0033] In this invention, the process of drawing out the colored white fabric is simple to apply, and the whiteness of light-colored fabrics can meet customer requirements, with a good hand feel and high color reproduction.

[0034] In this invention, when the dyed fabric is preferably a light-colored fabric or a dark-colored fabric with fixed dyeing, the digital discharge printing is preferably a simultaneous discharge of color and white. The light-colored fabric is preferably 0.1%~1% owf, specifically 0.1%, 0.3%, 0.5% or 1% owf, and the dark-colored fabric is preferably greater than 1% owf.

[0035] In this invention, the printing speed of the color and white printing is preferably 200~600m / h, specifically 200, 400 or 600m / h.

[0036] The following explains the scheme of applying white paint first and then color paint.

[0037] The present invention preferably processes the image using a professional layer tool, and then uses a professional belt-type digital printer to print a white layer first, followed by the simultaneous printing of a color image and ink discharge.

[0038] In this invention, the professional belt-type digital printer is preferably purchased from Shenzhen Runtianzhi Digital Equipment Co., Ltd., and the specific models are such as X3 high-speed direct-to-garment digital printer, X3PRO high-speed direct-to-garment digital printer, X5 high-speed direct-to-garment digital printer or X7 high-speed direct-to-garment digital printer.

[0039] In this invention, the method of first whitening and then coloring can solve the problem of whiteness in dark fabrics and achieve high color fidelity, but the resulting fabric has a poor hand feel.

[0040] In this invention, the digital discharge printing process preferably includes drying after completion, and the present invention does not have any special limitations on the specific parameters of the drying process.

[0041] In this invention, the post-processing preferably includes screen printing on the fabric after digital discharge printing to achieve multiple functional finishing of the fabric. This invention does not impose any particular limitation on the specific method of screen printing; any method well-known to those skilled in the art can be used.

[0042] In this invention, the post-treatment is preferably steaming or pressing, and the purpose of the post-treatment is to develop color.

[0043] In this invention, the temperature of the steam is preferably 100~110℃, specifically 100, 102, 104, 106, 108 or 110℃, saturated steam is preferred, and the time is preferably 6~10min, specifically 6, 8 or 10min.

[0044] In this invention, the ironing temperature is preferably 170~180℃, specifically 170, 172, 174, 176, 178 or 180℃, the time is preferably 10~15s, and the pressure is preferably 0.3~0.4MPa. In this invention, the ironing is preferably performed in an ironing machine.

[0045] In this invention, the post-processing preferably includes washing with water, followed by setting, drying, and softening to obtain the digital discharge printed fabric.

[0046] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0047] In this embodiment of the invention, the colored ink is a colored water-based textile coating, the white ink is a white water-based textile coating, and the discharge ink is the high-stability digital discharge inkjet ink of Embodiment 2 of Chinese Patent 202511195476.X.

[0048] Example 1 Sizing and digital discharge printing are carried out in separate steps. Sizing of dyed fabric: The mass of the sizing solution is 10% of the mass of the dyed fabric, the residual rate of the setting machine is 60%, one dip and one roll, temperature 130℃, machine speed 30m / min, the sized dyed fabric is unloaded and ready for use. The dyed fabric is a medium light color fabric with 0.1% owf. The formula of the sizing solution is: sodium carbonate 4wt%, glycerol 10wt%, nano SiO2 1wt% and the balance deionized water. The preparation process is: sodium carbonate, glycerol and nano SiO2 are mixed evenly in deionized water.

[0049] Simultaneous output of color, white, and discharge inks: After the image is processed by the professional RIP tool, the color ink, white ink, and discharge ink of the belt-type digital printer are simultaneously output and printed at a speed of 200m / h. The printed fabric is then dried and post-processed.

[0050] Post-treatment: The fabric is developed by steaming (temperature 102℃, saturated steam, time 10min), followed by washing, setting, drying and softening to obtain the finished fabric.

[0051] The printing resolution is 508×1200 dpi.

[0052] Example 2 Sizing and digital discharge printing are carried out in separate steps. Sizing of dyed fabric: The mass of the sizing solution is 10% of the mass of the dyed fabric, the residual rate of the setting machine is 60%, one dip and one roll, temperature 130℃, machine speed 30m / min, the sized dyed fabric is unloaded and ready for use. The dyed fabric is a medium light color fabric with 0.1% owf, and the sizing solution is the same as in Example 1.

[0053] White-to-Color Printing: After the image is processed by the professional RIP tool, it is printed on the X3 high-speed direct-to-garment digital printer, a professional belt-type digital printer, to achieve the following: first, a white layer is printed, and then the color image and discharge ink are printed simultaneously. After the printed fabric is dried, it is post-processed.

[0054] Post-treatment: The fabric is developed by steaming (temperature 102℃, saturated steam, time 10min), followed by washing, setting, drying and softening to obtain the finished fabric.

[0055] The printing resolution is 600×1800 dpi.

[0056] Example 3 Similar to Example 1, the only difference is that sizing is not performed, and the dyed fabric is directly subjected to color-white drawing.

[0057] The printing resolution is 508×1800 dpi.

[0058] Example 4 Similar to Example 2, the only difference is that sizing is not performed, and the dyed fabric is directly subjected to color-white drawing.

[0059] The printing resolution is 600×1200 dpi.

[0060] Example 5 Sizing and digital discharge printing are carried out simultaneously. A flatbed screen is connected in front of the digital printer. The flatbed screen and the digital printer are synchronized through a PLC program. A single screen is prepared by separating the image layers to achieve the purpose of sizing the printing area separately. It is not necessary to sizing the entire roll of fabric, thus reducing raw material costs.

[0061] Sizing of dyed fabric: The sizing solution is 10% of the weight of the dyed fabric. After sizing by scraping with a flat screen, the fabric is directly subjected to digital discharge printing. The formula of the sizing solution is: 2wt% carboxymethyl cellulose, 2wt% sodium carbonate, 6wt% glycerol, 0.5wt% nano-SiO2 and the balance deionized water. The preparation process is as follows: mix carboxymethyl cellulose, sodium carbonate, glycerol and nano-SiO2 in deionized water.

[0062] Simultaneous output of color, white, and discharge inks: After the image is processed by the professional RIP tool, the color ink, white ink, and discharge ink of the belt-type digital printer are simultaneously output and printed at a speed of 200m / h. The printed fabric is then dried and post-processed.

[0063] Post-treatment: The fabric is developed by steaming (temperature 102℃, saturated steam, time 10min), followed by washing, setting, drying and softening to obtain the finished fabric.

[0064] The printing resolution is 600×1800 dpi.

[0065] Example 6 Sizing and digital discharge printing are carried out simultaneously. A flatbed screen is connected in front of the digital printer. The flatbed screen and the digital printer are synchronized through a PLC program. A single screen is prepared by separating the image layers to achieve the purpose of sizing the printing area separately. It is not necessary to sizing the entire roll of fabric, thus reducing raw material costs.

[0066] Sizing of dyed fabric: Same as in Example 5.

[0067] White-to-Color Printing: After the image is processed by the professional RIP tool, it is printed on the X3 high-speed direct-to-garment digital printer, a professional belt-type digital printer, to achieve the following: first, a white layer is printed, and then the color image and discharge ink are printed simultaneously. After the printed fabric is dried, it is post-processed.

[0068] Post-treatment: The fabric is developed by steaming (temperature 102℃, saturated steam, time 10min), followed by washing, setting, drying and softening to obtain the finished fabric.

[0069] The printing resolution is 600×1200 dpi.

[0070] Example 7 Same as Example 1, except that: Post-treatment: The fabric is developed by pressing (temperature 170℃, time 15s, pressure 0.4MPa), followed by washing, setting, drying and softening to obtain the finished fabric.

[0071] The printing resolution is 508×1200 dpi.

[0072] Example 8 Similar to Example 2, the only difference is in the post-processing: the fabric is developed by pressing (temperature 180℃, time 10s, pressure 0.3MPa), followed by washing, setting, drying and softening to obtain the finished fabric.

[0073] The printing resolution is 508×1200 dpi.

[0074] Figures 1-8 The images shown are actual pictures of the finished fabrics obtained in Examples 1 to 8, demonstrating that the finished fabrics obtained by the present invention have high printing precision and resolution.

[0075] Example 9 Same as Example 3, except that: Post-treatment: The fabric is developed by pressing (temperature 170℃, time 15s, pressure 0.4MPa), followed by washing, setting, drying and softening to obtain the finished fabric.

[0076] The printing resolution is 600×1200 dpi.

[0077] Example 10 Same as Example 4, except that: Post-treatment: The fabric is developed by pressing (temperature 170℃, time 15s, pressure 0.4MPa), followed by washing, setting, drying and softening to obtain the finished fabric.

[0078] The printing resolution is 508×1800 dpi.

[0079] Example 11 Same as Example 5, except that: Post-treatment: The fabric is developed by pressing (temperature 170℃, time 15s, pressure 0.4MPa), followed by washing, setting, drying and softening to obtain the finished fabric.

[0080] The printing resolution is 508×1800 dpi.

[0081] Example 12 Same as Example 6, except that: Post-treatment: The fabric is developed by pressing (temperature 170℃, time 15s, pressure 0.4MPa), followed by washing, setting, drying and softening to obtain the finished fabric.

[0082] The printing resolution is 600×1200 dpi.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A digital printing method, characterized in that, Includes the following steps: The dyed fabric is subjected to digital discharge printing and post-treatment in sequence to obtain digital discharge printed fabric. The digital discharge printing is performed by discharge of color and white simultaneously or by discharge of white first and then color. The simultaneous printing of color ink, white ink, and discharge printing ink is described as printing simultaneously using color ink, white ink, and discharge printing ink. The "white-then-color discharge printing" method involves first printing with white ink, and then simultaneously printing with colored ink and discharge printing ink.

2. The digital printing method according to claim 1, characterized in that, When the dyed fabric is a light-colored fabric or a dark-colored fabric that has been dyed, the digital discharge printing is performed with both color and white discharge. The light-colored fabric has an owf of 0.1% to 1%, and the dark-colored fabric has an owf of more than 1%.

3. The digital printing method according to claim 1, characterized in that, The printing speed of the color and white printing plates is 200~600m / h.

4. The digital printing method according to claim 1, characterized in that, Before digital discharge printing, the dyed fabric is sized, and the sizing is done using a sizing solution.

5. The digital printing method according to claim 4, characterized in that, The sizing solution includes a thickener, and the mass percentage of the thickener in the sizing solution is 0.5% to 2%.

6. The digital printing method according to claim 4, characterized in that, The sizing and digital discharge printing are carried out in a combined screen printing machine and digital discharge printing machine. The screen printing machine in the combined screen printing machine and digital discharge printing machine is a flat screen machine or a rotary screen machine. The sizing is carried out in the screen printing machine.

7. The digital printing method according to claim 1, characterized in that, The post-processing is steaming or pressing.

8. The digital printing method according to claim 7, characterized in that, The steam temperature is 100~110℃, saturated steam is used, and the time is 6~10 minutes.

9. The digital printing method according to claim 7, characterized in that, The pressing temperature is 170~180℃, the time is 10~15s, and the pressure is 0.3~0.4MPa.

10. The digital printing method according to claim 1, characterized in that, The post-processing process also includes screen printing on the fabric after digital discharge printing.

Images