A digital wet spray coating process for yam

Abstract

This invention relates to the field of printing technology, specifically a digital wet-jet printing process with yam coating. The process includes: threading a pre-treated white fabric onto the guide belt of a dual-circular online digital printing machine; applying a modified foaming paste to one side of the fabric; performing digital wet-jet printing on the same side after sizing; drying the fabric after wet-jet printing to obtain a single-sided printed fabric; steaming, washing, and drying the single-sided printed fabric; then applying a yam coating to the other side of the fabric, followed by steaming, washing, and drying to obtain the final product. This invention utilizes a modified foaming paste to sizing the front side of the fabric, followed immediately by wet-jet printing. The printing is completed after high-temperature foaming, preventing ink penetration to the back of the fabric and giving it high color fastness, good antibacterial properties, and excellent elasticity. The subsequent application of a yam coating to the back of the fabric, containing concentrated aloe vera juice and silk collagen, provides protection against dry skin.

Description

Technical Field

[0001] This invention relates to the field of printing technology, specifically to a digital wet spray coating process for yam. Background Technology

[0002] To meet people's pursuit of personalized clothing, various colors and patterns are often printed on garments, resulting in diverse styles to cater to different tastes. Current digital inkjet printing processes involve sizing and drying the fabric, followed by single-sided printing, then drying again, steaming, and washing. This process involves numerous drying cycles and high energy consumption. Furthermore, the foamed printing area is prone to deformation and fading due to washing and friction. Therefore, a digital wet inkjet printing process with added yam coating is proposed. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a digital wet-spray coating process for yam, which uses modified foaming paste to coat the front of the fabric, followed immediately by wet spray printing. After high-temperature foaming, the printing is completed, which can prevent ink from penetrating to the back of the fabric and gives it the characteristics of high color fastness, good antibacterial properties, and excellent elasticity.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a digital wet spray coating process for yam, comprising the following steps: (1) Insert the pretreated white fabric into the guide belt of the double-circular wire mesh printing machine and apply modified foaming paste to one side. (2) After the sizing is completed, the surface is digitally wet-sprayed and then dried to obtain a single-sided printed fabric. (3) Steam, wash and dry the single-sided inkjet printed fabric, then coat the other side with yam paste, and then steam, wash and dry it to obtain the final product.

[0005] Preferably, in step (1), the modified foaming slurry comprises the following raw materials by mass percentage: sodium alginate 3-5%, gum arabic 1-2%, modified starch 1-2%, microcapsule foaming powder 0.5-1.5%, ammonia 1-1.5%, glycerol 2-3%, urea 10-15%, sodium bicarbonate 2-5%, micron-sized modified carbon fiber 3-5%, nano titanium dioxide 5-7%, and the balance being distilled water.

[0006] Preferably, the modified foaming slurry is prepared by mixing sodium alginate, gum arabic, modified starch, foaming powder, ammonia, glycerin, urea, baking soda, micron-sized modified carbon fiber, nano titanium dioxide and distilled water, and then using a foaming machine to slurry until microbubbles are present.

[0007] Preferably, the preparation method of the micron-sized modified carbon fiber is as follows: the micron-sized carbon fiber is oxidized and etched with ozone to obtain the carbon fiber; during the process, the concentration of ozone is controlled at 100 mg / L, the flow rate is 15-20 mL / min, and the oxidation and etching time is 2-3 min.

[0008] Preferably, the length of the micron-sized modified carbon fiber is 1-3 μm; and the particle size of the nano-titanium dioxide is 50-100 nm.

[0009] Preferably, in step (3), the steaming is carried out under saturated steam conditions at 102°C for 20-30 minutes.

[0010] Preferably, in step (3), the yam paste comprises the following raw materials by mass percentage: 4-6% polyacrylate, 1-2% microcapsule foaming powder, 1-2% polyurethane associative thickener, 20-25% modified yam juice, 5-8% concentrated aloe vera juice, 4-5% silk collagen, 1-2% ammonia, and the remainder is distilled water.

[0011] Preferably, the method for preparing the yam paste is as follows: polyacrylate, microcapsule foaming powder, polyurethane associative thickener, modified yam juice, concentrated aloe vera juice, silk collagen, ammonia and distilled water are stirred evenly to obtain the paste.

[0012] Preferably, the modified yam juice is prepared by crushing fresh yam, grinding it together with distilled water, and then pressing and filtering it.

[0013] Preferably, the mass ratio of the fresh yam to distilled water is 1:(3-5).

[0014] This invention provides a digital wet spray coating process for yam, which has the following advantages compared with the prior art: This invention utilizes a modified foaming paste to coat the front of the fabric, followed immediately by wet spray printing. After high-temperature foaming, the printing is completed, which avoids ink penetration to the back of the fabric. It also overcomes the problems of pattern clarity, color saturation, and color bleeding in wet paste printing, giving it characteristics such as high color fastness, good antibacterial properties, and excellent elasticity. Next, a yam paste is used to coat the back of the fabric, and the concentrated aloe vera juice and silk collagen in it have a protective effect against dry skin.

[0015] This invention utilizes ozone to modify micron-sized carbon fibers, increasing the number of hydrophilic functional groups and surface roughness, allowing them to be better dispersed in the slurry. The resulting foamed coating has better elasticity, preventing it from sinking and failing to bounce back, which would affect the layering of the printed pattern.

[0016] This invention adds nano-titanium dioxide to the modified foaming slurry, which enables the modified foaming coating to have good antibacterial properties under bright conditions, effectively preventing mold growth in the printed area, while also improving its abrasion and wash resistance. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the layered structure of the finished fabric of the present invention; Figure 2 The images show the appearance of the wet-spray digital printing surface and the coated surface of the finished fabric according to the present invention. Detailed Implementation

[0018] The following embodiments are provided to illustrate the implementation of this application in detail, so that the process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] Example 1 The preparation method of the modified foaming slurry is as follows: S11. Weigh the following raw materials by mass percentage: sodium alginate 3%, peach gum 1%, modified starch 1%, microcapsule foaming powder (EMH204) 1%, ammonia (25wt%) 1%, glycerol 2%, urea 12%, baking soda 3%, micron-sized modified carbon fiber (length 1-3μm) 5%, nano titanium dioxide (particle size 50-100nm) 7%, with the remainder being distilled water; The above-mentioned micron-sized modified carbon fiber is prepared by oxidizing and etching micron-sized carbon fiber with ozone; during the process, the concentration of ozone is controlled at 100 mg / L, the flow rate is 15 mL / min, and the oxidation and etching time is 3 min. S12. After uniformly mixing the above raw materials, use a foaming machine to beat the mixture until micro-bubbles are present, and the product is obtained.

[0020] Example 2 The preparation method of the modified foaming slurry is as follows: S11. Weigh the following raw materials by mass percentage: sodium alginate 5%, peach gum 2%, modified starch 2%, microcapsule foaming powder (EMH204) 1.5%, ammonia (25wt%) 1.5%, glycerin 3%, urea 15%, sodium bicarbonate 5%, micron-sized modified carbon fiber (length 1-3μm) 3%, nano titanium dioxide (particle size 50-100nm) 5%, with the remainder being distilled water; The above-mentioned micron-sized modified carbon fiber is prepared by oxidizing and etching micron-sized carbon fiber with ozone; during the process, the concentration of ozone is controlled at 100 mg / L, the flow rate is 20 mL / min, and the oxidation and etching time is 2 min. S12. After uniformly mixing the above raw materials, use a foaming machine to beat the mixture until micro-bubbles are present, and the product is obtained.

[0021] Example 3 The preparation method of the yam paste is as follows: S21. Weigh the following raw materials by mass percentage: 5% polyacrylate, 1% microencapsulated foaming powder (EMH204), 2% polyurethane associative thickener, 20% modified yam juice, 5% concentrated aloe vera juice, 5% silk collagen, 1% ammonia, and the remainder is distilled water. The modified yam juice mentioned above is prepared by grinding fresh yam and distilled water together in a mass ratio of 1:3, followed by pressing and filtering. S22. Stir the above ingredients evenly to obtain the final product.

[0022] Example 4 The preparation method of the yam paste is as follows: S21. Weigh the following raw materials by mass percentage: 6% polyacrylate, 2% microencapsulated foaming powder (EMH204), 1% polyurethane associative thickener, 25% modified yam juice, 8% concentrated aloe vera juice, 4% silk collagen, 2% ammonia, and the remainder is distilled water. The modified yam juice mentioned above is prepared by grinding fresh yam and distilled water together in a mass ratio of 1:5, followed by pressing and filtering. S22. Stir the above ingredients evenly to obtain the final product.

[0023] Example 5 A digital wet spray coating process for yam includes the following steps: (1) Insert the pretreated white fabric into the guide belt of the double-circular wire mesh printing machine and apply modified foaming paste to one side. (2) After the sizing is completed, the surface is digitally wet-sprayed and then dried to obtain a single-sided printed fabric. (3) The single-sided inkjet printed fabric is steamed, washed and dried. Then, the other side is coated with yam paste, steamed, washed and dried again to obtain the final product. The steaming is carried out at 102℃ saturated steam for 20 minutes.

[0024] In this embodiment, the modified foaming slurry from Example 2 and the yam slurry from Example 4 are used.

[0025] Example 6 A digital wet spray coating process for yam includes the following steps: (1) Insert the pretreated white fabric into the guide belt of the double-circular wire mesh printing machine and apply modified foaming paste to one side. (2) After the sizing is completed, the surface is digitally wet-sprayed and then dried to obtain a single-sided printed fabric. (3) The single-sided inkjet printed fabric is steamed, washed and dried. Then, the other side is coated with yam paste, steamed, washed and dried again to obtain the final product. The steaming is carried out at 102℃ saturated steam for 30 minutes.

[0026] In this embodiment, the modified foaming slurry from Example 1 and the yam slurry from Example 4 are used.

[0027] Example 7 A digital wet spray coating process for yam includes the following steps: (1) Insert the pretreated white fabric into the guide belt of the double-circular wire mesh printing machine and apply modified foaming paste to one side. (2) After the sizing is completed, the surface is digitally wet-sprayed and then dried to obtain a single-sided printed fabric. (3) The single-sided inkjet printed fabric is steamed, washed and dried. Then, the other side is coated with yam paste, steamed, washed and dried again to obtain the final product. The steaming is carried out at 102℃ saturated steam for 25 minutes.

[0028] In this embodiment, the modified foaming slurry from Example 1 and the yam slurry from Example 3 are used.

[0029] Comparative Example 1 A digital wet spray coating process for yam includes the following steps: (1) Insert the pretreated white fabric into the guide belt of the double-circular wire mesh printing machine and apply modified foaming paste to one side. The preparation method of the above modified foaming slurry is as follows: S11, Weigh the following raw materials by mass percentage: sodium alginate 3%, peach gum 1%, modified starch 1%, microcapsule foaming powder (EMH204) 1%, ammonia water (25wt%) 1%, glycerol 2%, urea 12%, sodium bicarbonate 3%, micron-sized carbon fiber (length 1-3μm) 5%, nano titanium dioxide (particle size 50-100nm) 7%, with the remainder being distilled water; S12, After uniformly mixing the above raw materials, use a foaming machine to slurry until microbubbles are present, thus obtaining the slurry. (2) After the sizing is completed, the surface is digitally wet-sprayed and then dried to obtain a single-sided printed fabric. (3) The single-sided inkjet printed fabric is steamed, washed and dried. Then, the other side is coated with yam paste, steamed, washed and dried again to obtain the final product. The steaming is carried out at 102℃ saturated steam for 25 minutes.

[0030] In this comparative example, the yam paste from Example 3 was used.

[0031] Comparative Example 2 A digital wet spray coating process for yam includes the following steps: (1) Insert the pretreated white fabric into the guide belt of the double-circular wire mesh printing machine and apply modified foaming paste to one side. The preparation method of the above modified foaming slurry is as follows: S11, Weigh the following raw materials by mass percentage: sodium alginate 3%, peach gum 1%, modified starch 1%, microcapsule foaming powder (EMH204) 1%, ammonia water (25wt%) 1%, glycerol 2%, urea 12%, sodium bicarbonate 3%, nano titanium dioxide (particle size 50-100nm) 7%, and the balance is distilled water; S12, Mix the above raw materials evenly, and then use a foaming machine to slurry until microbubbles are present, thus obtaining the slurry. (2) After the sizing is completed, the surface is digitally wet-sprayed and then dried to obtain a single-sided printed fabric. (3) The single-sided inkjet printed fabric is steamed, washed and dried. Then, the other side is coated with yam paste, steamed, washed and dried again to obtain the final product. The steaming is carried out at 102℃ saturated steam for 25 minutes.

[0032] In this comparative example, the yam paste from Example 3 was used.

[0033] Comparative Example 3 A digital wet spray coating process for yam includes the following steps: (1) Insert the pretreated white fabric into the guide belt of the double-circular wire mesh printing machine and apply modified foaming paste to one side. The preparation method of the above modified foaming slurry is as follows: S11, Weigh the following raw materials by mass percentage: sodium alginate 3%, gum arabic 1%, modified starch 1%, microcapsule foaming powder (EMH204) 1%, ammonia (25wt%) 1%, glycerol 2%, urea 12%, sodium bicarbonate 3%, micron-sized modified carbon fiber (length 1-3μm) 5%, with the remainder being distilled water; wherein the preparation method of the micron-sized modified carbon fiber is: to oxidize and etch the micron-sized carbon fiber with ozone; during the process, the concentration of ozone is controlled at 100mg / L, the flow rate is 15mL / min, and the oxidation and etching time is 3min; S12, After uniformly mixing the above raw materials, use a foaming machine to slurry until microbubbles are present, and the slurry is obtained. (2) After the sizing is completed, the surface is digitally wet-sprayed and then dried to obtain a single-sided printed fabric. (3) The single-sided inkjet printed fabric is steamed, washed and dried. Then, the other side is coated with yam paste, steamed, washed and dried again to obtain the final product. The steaming is carried out at 102℃ saturated steam for 25 minutes.

[0034] In this comparative example, the modified foaming slurry from Example 1 and the yam slurry from Example 3 were used.

[0035] Performance testing The finished fabrics from Examples 5-7 and Comparative Examples 1-3 were used as samples for testing.

[0036] 1. The color fastness to rubbing and washing of each sample were tested according to the standards GB / T 3920-2008 and GB / T 3921-2008. The specific test results are shown in Table 1.

[0037] Table 1 Color fastness

[0038] As shown in Table 1, compared with Example 7, the modified foaming slurry in Comparative Example 1 contained unmodified micron-sized carbon fibers, and the color fastness to rubbing and washing did not change significantly; the modified foaming slurry in Comparative Example 2 did not contain micron-sized modified carbon fibers, and the color fastness to rubbing and washing decreased slightly; the modified foaming slurry in Comparative Example 3 did not contain nano-titanium dioxide, and the color fastness to rubbing and washing decreased.

[0039] 2. The antibacterial properties of the samples were tested according to GB / T 20944.3-2008. The antibacterial properties of the samples were tested indoors under bright daylight. The specific test results are shown in Table 2.

[0040] Table 2 Antibacterial properties

[0041] As shown in Table 2, compared with Example 7, the modified foaming slurry in Comparative Example 3 did not contain nano-titanium dioxide, and its antibacterial properties were significantly reduced.

[0042] 3. By applying an external force of 1 kg to the surface of the modified foamed coating of the sample for three seconds and then quickly removing the external force, the recovery time of the coating was tested. The shorter the time, the better the resilience of the coating. The specific test results are shown in Table 3.

[0043] Table 3 Coating springback time

[0044] As shown in Table 3, compared with Example 7, the modified foaming slurry in Comparative Example 1 used unmodified micron-sized carbon fibers, resulting in a decrease in coating resilience; the modified foaming slurry in Comparative Example 2 did not add micron-sized modified carbon fibers, leading to a significant decrease in coating resilience.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A digital wet spray coating process for yam, characterized in that, Includes the following steps: (1) Insert the pretreated white fabric into the guide belt of the double-circular wire mesh printing machine and apply modified foaming paste to sizing one side. (2) After the sizing is completed, the surface is digitally wet-sprayed and then dried to obtain a single-sided printed fabric. (3) Steam, wash and dry the single-sided inkjet printed fabric, then coat the other side with yam paste, and then steam, wash and dry it to obtain the final product.

2. The digital wet spray coating process for yam according to claim 1, characterized in that, In step (1), the modified foaming slurry comprises the following raw materials by mass percentage: sodium alginate 3-5%, gum arabic 1-2%, modified starch 1-2%, microcapsule foaming powder 0.5-1.5%, ammonia 1-1.5%, glycerin 2-3%, urea 10-15%, sodium bicarbonate 2-5%, micron-sized modified carbon fiber 3-5%, nano titanium dioxide 5-7%, and the balance being distilled water.

3. The digital wet spray coating process for yam according to claim 2, characterized in that, The modified foaming slurry is prepared by mixing sodium alginate, gum arabic, modified starch, foaming powder, ammonia, glycerin, urea, baking soda, micron-sized modified carbon fiber, nano titanium dioxide and distilled water, and then using a foaming machine to slurry it until microbubbles are present.

4. The digital wet spray coating process for yam according to claim 2, characterized in that, The method for preparing the micron-sized modified carbon fiber is as follows: the micron-sized carbon fiber is oxidized and etched using ozone to obtain the modified carbon fiber; during the process, the concentration of ozone is controlled at 100 mg / L, the flow rate is 15-20 mL / min, and the oxidation and etching time is 2-3 min.

5. The digital wet spray coating process for yam according to claim 2, characterized in that, The length of the micron-sized modified carbon fiber is 1-3 μm; the particle size of the nano-titanium dioxide is 50-100 nm.

6. The digital wet spray coating process for yam according to claim 1, characterized in that, In step (3), the steaming is carried out under saturated steam conditions at 102°C for 20-30 minutes.

7. The digital wet spray coating process for yam according to claim 1, characterized in that, In step (3), the yam paste comprises the following raw materials by mass percentage: 4-6% polyacrylate, 1-2% microcapsule foaming powder, 1-2% polyurethane associative thickener, 20-25% modified yam juice, 5-8% concentrated aloe vera juice, 4-5% silk collagen, 1-2% ammonia, and the remainder is distilled water.

8. The digital wet spray coating process for yam according to claim 7, characterized in that, The preparation method of the yam paste is as follows: polyacrylate, microcapsule foaming powder, polyurethane associative thickener, modified yam juice, concentrated aloe vera juice, silk collagen, ammonia and distilled water are stirred evenly to obtain the paste.

9. The digital wet spray coating process for yam according to claim 8, characterized in that, The modified yam juice is prepared by crushing fresh yam, grinding it together with distilled water, and then pressing and filtering it.

10. The digital wet spray coating process for yam according to claim 9, characterized in that, The mass ratio of fresh yam to distilled water is 1:(3-5).

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