A digital printing color fastness strengthening treatment process suitable for multi-fabrics

Abstract

This invention relates to the field of fabric finishing and dyeing technology, specifically to a digital printing colorfastness enhancement process adaptable to multiple fabrics. This digital printing colorfastness enhancement process includes a refining and degreasing step, a drying step, a digital direct-to-garment printing step, and a setting step, performed sequentially. Through these four core steps, the digital printing colorfastness enhancement process achieves high colorfastness adaptable to a variety of fabrics.

Description

Technical Field

[0001] This invention relates to the field of fabric finishing and dyeing technology, specifically to a digital printing color fastness enhancement process adaptable to multiple fabrics. Background Technology

[0002] Digital printing technology, due to its flexibility, high precision, strong customization capabilities, and environmental friendliness, has been widely used in the textile printing and dyeing industry and is gradually replacing traditional printing processes. However, different fabrics have significantly different physicochemical properties, fiber structures, and surface characteristics, making it difficult for general-purpose processing techniques to meet the colorfastness requirements of various fabrics. In other words, existing technologies suffer from strong versatility but insufficient specificity, and some processes pose environmental risks or damage to the fabric's hand feel. Summary of the Invention

[0003] The technical problem to be solved by this invention is: how to improve the versatility of the processing technology so that it can meet the color fastness requirements of various fabrics.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a digital printing color fastness enhancement process adaptable to multiple fabrics, including a refining and degreasing process, a drying process, a digital direct-to-garment printing process, and a setting process performed sequentially.

[0005] The beneficial effects of this invention are as follows: This invention obtains a high color fastness treatment process suitable for a variety of fabrics through four core steps: refining and degreasing, drying, digital direct-to-garment printing, and setting. Detailed Implementation

[0006] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments.

[0007] This invention is applicable to fabric dyeing and finishing, and achieves high-fastness dyeing of polyester, nylon and cotton through a series of refining and degreasing processes, drying processes, digital direct-to-garment printing processes and setting processes.

[0008] A digital printing color fastness enhancement process adaptable to multiple fabrics includes a refining and degreasing process, a drying process, a digital direct-to-garment printing process, and a setting process performed sequentially.

[0009] As can be seen from the above description, the beneficial effects of this invention are as follows: textile oil is added to the fabric during weaving; during dyeing and finishing, the fabric is first refined and de-oiled to prevent the oil from affecting the inkjet effect of subsequent digital direct-to-garment printing; then it is dried before digital direct-to-garment printing to avoid excessive moisture affecting the dyeing rate; after digital direct-to-garment printing, it is set at high temperature to improve dimensional stability. The fabric treated by the above steps has excellent color fastness.

[0010] Furthermore, when the fabric is made of polyester, the refining and degreasing process is carried out under weakly alkaline conditions at a temperature of 90~100℃. When the fabric is made of nylon, the refining and degreasing process is carried out under neutral conditions at a temperature of 70~80℃. When the fabric is cotton, the refining and degreasing process is carried out under strongly alkaline conditions at a temperature of 90~100℃.

[0011] As described above, polyester scouring primarily removes oils (such as spinning oil) and weaving sizing agents added during the spinning process. Since polyester itself does not contain natural impurities, it only requires gentle treatment. Polyester scouring is usually carried out under weakly alkaline conditions, with the temperature controlled between 90 and 100°C to avoid fiber damage caused by high temperatures.

[0012] Nylon: Oils and sizing agents need to be removed, and the oligomer problem unique to nylon needs to be addressed. Because nylon is sensitive to alkalis and is prone to hydrolysis, which leads to a decrease in strength, nylon refining needs to be carried out under milder conditions (70~80℃).

[0013] Cotton: It is necessary to remove natural impurities such as pectin, wax, protein, and pigments, as well as cottonseed hulls. This is the most intensive treatment, so it is carried out under strong alkaline conditions of 90~100℃ to fully remove natural impurities.

[0014] Furthermore, when the fabric is made of polyester, the drying process controls the fabric's moisture content to be 5-10 wt%. When the fabric is made of nylon, the drying process controls the moisture content of the fabric to be below 1 wt%. When the fabric is made of cotton, the drying process controls the moisture content of the fabric to be 10~20wt%.

[0015] As described above, polyester requires strict control of its moisture content (5-10%). Excessive moisture content leads to uneven dyeing, while insufficient moisture affects the bonding between the dye and the fiber. Nylon is sensitive to moisture and requires thorough drying to prevent moisture from affecting the application of acid dyes during subsequent dyeing. Cotton needs to maintain a certain moisture content (10-20%) to facilitate dye penetration and fixation during subsequent dyeing processes.

[0016] Furthermore, when the fabric is made of polyester or nylon, it also includes a predetermined process between the refining and degreasing process and the drying process.

[0017] As can be seen from the above description, by pre-arranging the fiber molecules into crystals, the fabric specifications and style effects are stabilized, providing dimensional stability for subsequent drying and pretreatment liquid impregnation.

[0018] Furthermore, when the fabric is made of polyester, the temperature of the predetermined process is 180~200℃; When the fabric is made of nylon, the temperature of the predetermined process is 160~165℃.

[0019] As can be seen from the above description, polyester needs to be processed at 180~200℃ to eliminate the distortion and wrinkles of the fibers during the weaving process, stabilize the size, and prevent defects such as streaks, wrinkles, and chicken claw patterns from occurring during the dyeing process.

[0020] Nylon: Because nylon has a low glass transition temperature, high temperatures can cause excessive shrinkage or yellowing of the fiber, so the pre-forming temperature is relatively low (160~165℃).

[0021] Cotton: It is usually not pre-shaped because cotton fibers are prone to yellowing and strength reduction at high temperatures. The dimensional stability of cotton fabrics is mainly achieved through mercerizing and finishing.

[0022] Furthermore, when the fabric is made of nylon or cotton, a pretreatment process is also included between the drying process and the digital direct-to-garment printing process.

[0023] As can be seen from the above description, the pretreatment process can prevent the fabric from bleeding during the color spraying process and make the color more vibrant.

[0024] Furthermore, when the fabric is made of nylon, a weakly acidic pretreatment solution is used in the pretreatment process; when the fabric is made of cotton, an alkaline pretreatment solution is used in the pretreatment process.

[0025] Furthermore, the pH value of the weakly acidic pretreatment solution is 5-6.

[0026] As described above, nylon requires a weakly acidic pretreatment solution to prepare for subsequent acid dyeing; the pH value is typically controlled between 5.0 and 6.0. Cotton uses an alkaline pretreatment solution to improve fiber hydrophilicity and dye adsorption capacity, preparing it for reactive dyeing.

[0027] Furthermore, the weakly acidic pretreatment solution and the alkaline pretreatment solution are prepared 30-50 minutes before pretreatment.

[0028] As can be seen from the above description, the ingredients are prepared only before pretreatment to avoid changes in the pretreatment solution due to the influence of air.

[0029] Furthermore, the fabric is trimmed and shaped before the digital direct-to-garment printing process.

[0030] As can be seen from the above description, the fabric has issues such as rough edges, uneven thickness, and ruffles on both sides, which require trimming to avoid these problems affecting the printhead and causing printing deviations.

[0031] Furthermore, when the fabric is made of polyester, the digital direct-to-garment printing process is as follows: disperse dye is used for printing, and after drying at 100~140℃, the color is developed at 165~195℃.

[0032] As can be seen from the above description, digital direct-to-garment printing uses different dyes depending on the material of the printing base. For polyester, disperse dyes are used for printing. To ensure that the fabric rolls up without color smudging, drying is required after printing. The drying temperature is between 100 and 140°C, and the disperse dyeing temperature is between 165 and 195°C after dyeing.

[0033] Furthermore, when the fabric is made of nylon, the digital direct-to-garment printing process is as follows: acid dye is used for printing, and after drying at 80~100℃, it is steamed at 100~103℃.

[0034] As can be seen from the above description, nylon is printed with acid dyes. In order to ensure that the fabric rolls up without color smudging, drying is required after printing. The drying temperature is between 80 and 100°C. Acid dyes need to be steamed at 100 to 103°C.

[0035] Furthermore, when the fabric is cotton, the digital direct-to-garment printing process is as follows: using reactive dyes for printing, drying at 80~100℃, and then steaming at 100~103℃.

[0036] As can be seen from the above description, cotton is printed with reactive dyes. In order to ensure that the fabric rolls up without color smudging, it needs to be dried after printing. The drying temperature is between 80 and 100°C, and the reactive dyes need to be steamed at 100 to 103°C.

[0037] Furthermore, the fabrics used for digital direct-to-garment printing should be arranged from darkest to lightest colors to prevent color bleeding when applying the color-fixing agent.

[0038] Furthermore, when the fabric is made of polyester or nylon, it also includes a color-fixing process and a soaping process performed sequentially between the digital direct-to-garment printing process and the setting process.

[0039] As can be seen from the above description, after digital direct inkjet printing, the color is fixed and then washed with soap to remove excess ink in order to improve color fastness.

[0040] Furthermore, a fixing agent is added during the color fixing process, the temperature is <150℃, and the machine speed is 15~20 Y / min.

[0041] As can be seen from the above description, color change will occur when the fixing temperature exceeds 150℃.

[0042] Furthermore, when the fabric is made of polyester, the temperature for the setting and color fixing process is 130~135℃; When the fabric is made of nylon, the temperature of the setting and color fixing process is 90~100℃, and the pH is controlled between 5.0 and 6.0.

[0043] As described above, polyester requires high-temperature treatment (130~135℃) to ensure the disperse dyes are fully applied and fixed within the fiber. Nylon uses acid dyes at 100℃ with the pH controlled between 5.0 and 6.0 to ensure a stable bond between the dye and the fiber. Cotton typically has a color-fixing effect during pretreatment, using reactive dyes to form covalent bonds with the fiber under alkaline conditions; therefore, a separate color-fixing step is not required in post-treatment.

[0044] Furthermore, the temperature of the soap washing process is 40~50℃.

[0045] As can be seen from the above description, excessively high temperatures can lead to dye hydrolysis and a decrease in color fastness.

[0046] Furthermore, when the fabric is made of polyester, the temperature of the forming process is 175~185℃; When the fabric is made of nylon, the heat setting process is carried out in two stages. The temperature of the first stage is 160~165℃, and the temperature of the second stage is 175~180℃. When the fabric is made of cotton, the temperature of the forming process is 90~100℃.

[0047] As described above, polyester requires heat setting at 175-185℃ to stabilize fabric dimensions, improve hand feel, and enhance wrinkle resistance. Nylon uses a two-stage heat setting process: the first stage involves relaxation setting at 160-165℃ to eliminate internal stress; the second stage involves tension setting at 175-180℃ to improve dimensional stability. Cotton requires heat setting at 90-100℃, primarily for dimensional stability and improved hand feel, and does not require high-temperature setting.

[0048] Furthermore, it also includes a reduction cleaning process located between the soaping process and the setting process.

[0049] As can be seen from the above description, the restoration cleaning process is suitable for dark black fabrics and fabrics requiring high fastness.

[0050] Furthermore, when the subsequent process temperature of the setting process is below 140°C, citric acid and CMK-815A are added during the setting process.

[0051] As described above, citric acid and CMK-815A can be used together to improve the feel and prevent phenolic yellowing. However, if citric acid is used in subsequent high-temperature processes, it can cause the fabric to yellow.

[0052] Furthermore, when the fabric is made of a blend of yarns of at least two materials, with yarns containing ≥80wt% as the main yarn, the processing technology is selected based on the material of the main yarn.

[0053] Another technical solution of the present invention is: a digital printing color fastness enhancement process adapted to polyester, comprising the following steps: S1. Refining and degreasing process: carried out under weakly alkaline conditions, with the addition of 0.5~1.5g / L of AFN at a temperature of 90~100℃; S2. Pre-defined process: temperature is 180~200℃; S3. Drying process: Control the moisture content of the fabric to 5~10wt%; S4. Trim and straighten the fabric at the edges; S5. Digital direct-to-garment printing process: Disperse dye inkjet printing is used, and after drying at 100~140℃, the color is developed at 165~195℃; Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S6. Shaping and color fixing process: temperature is 130~135℃, machine speed is 15~20 Y / min; S7. Soap washing process: temperature is 40~50℃. S8, Restoration cleaning process; S9. Setting process: The temperature is 175~185℃. Citric acid and CMK-815A are added during the setting process.

[0054] Another technical solution of the present invention is: a digital printing color fastness enhancement process adapted to nylon fabrics, comprising the following steps: S1. Refining and degreasing process: carried out under neutral conditions, with 0.5~1.5g / L of AFN added, and the temperature is 70~80℃; S2. Pre-defined process: temperature 160~165℃; S3. Drying process: Control the moisture content of the fabric to below 1wt%; S4. Pretreatment process: Use a weakly acidic pretreatment solution with a pH value of 5-6. Prepare the weakly acidic pretreatment solution 30-50 minutes before pretreatment. S5, edge trimming and fabric finishing; S6. Digital direct-to-garment printing process: Acid dye inkjet printing is used, and after drying at 80~100℃, it is vaporized at 100~103℃. Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S7. Fixing and color-fixing process: when the temperature is 90~100℃, the pH is controlled at 5.0~6.0, and the machine speed is 15~20 Y / min; S8. Soap washing process: temperature is 40~50℃. S9, Restoration cleaning process; S10. Heat setting process: Two-stage heat setting is carried out. The temperature of the first stage is 160~165℃, and the temperature of the second stage is 175~180℃. Citric acid and CMK-815A are added during the molding process.

[0055] Another technical solution of the present invention is: a digital printing color fastness enhancement process adapted to cotton fabrics, comprising the following steps: S1. Refining and degreasing process: carried out under strongly alkaline conditions, with the addition of 0.5~1.5g / L of AFN at a temperature of 90~100℃; S2. Drying process: Control the moisture content of the fabric to 10~20wt%; S3. Pretreatment process: Alkaline pretreatment solution is used, and the alkaline pretreatment solution is prepared 30-50 minutes before pretreatment. S4. Trim and straighten the fabric at the edges; S5. Digital direct-to-garment printing process: Printing with reactive dyes, drying at 80~100℃, and then steaming at 100~103℃. Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S6. Forming process: Temperature is 90~100℃; add citric acid and CMK-815A.

[0056] Embodiment 1 of the present invention is: a digital printing color fastness enhancement process adapted to polyester, the specific steps of which are as follows: S1. Refining and degreasing process: carried out at pH 8.5, with 1 g / L of AFN added at 95℃; S2. Pre-determined process: Temperature is 190℃, and speed is 25 Y / min; S3. Drying process: Temperature 135℃, speed 25 Y / min, control the moisture content of the fabric to 8wt%; S4. Trim and straighten the fabric at the edges; S5. Digital direct-to-garment printing process: Using Inspire dispersible ink for printing, drying at 120℃ and then color development at 180℃; Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S6. Shaping and color fixing process: The temperature is 133℃, add 7wt% color fixing agent L2H2 according to the fabric weight ratio of 1:1, and the machine speed is 18Y / min. S7. Soap washing process: Soap wash in the tub, add soap detergent Sinmorle RC335 3g / L, temperature 45℃, time 30min; S8. Reduction cleaning process: Add 1.5g / L caustic soda, 4g / L sodium hydrosulfite, and 3g / L Sinmorle RC-335 soap detergent, treat at 80℃ for 20min, and then neutralize with a solution containing 0.5g / L HAC. S9. Setting process: Temperature is 180℃, speed is 19 Y / min, and 0.4wt% citric acid and 0.5wt% CMK-815A are added during the setting process.

[0057] Embodiment 2 of the present invention is: a digital printing color fastness enhancement process adapted to 80wt% polyester and 20wt% nylon blended fabrics, the specific steps of which are as follows: S1. Refining and degreasing process: carried out at pH 8.5, with 0.5 g / L of AFN added, at a temperature of 90℃; S2. Pre-determined process: temperature 180℃, speed 25 Y / min; S3. Drying process: Temperature 130℃, speed 25 Y / min, control the moisture content of the fabric to 5wt%; S4. Trim and straighten the fabric at the edges; S5. Digital direct-to-garment printing process: Using Inspire dispersible ink for printing, drying at 100℃ and then color development at 165℃; Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S6. Shaping and fixing process: The temperature is 1305℃, add 7wt% fixing agent L2H2 according to the fabric weight ratio of 1:1, and the machine speed is 15Y / min. S7. Soap washing process: Soap wash in the tub, add soap detergent Sinmorle RC335 3g / L, temperature is 40℃, time is 30min; S8. Reduction cleaning process: Add 1.5g / L caustic soda, 4g / L sodium hydrosulfite, and 3g / L Sinmorle RC-335 soap detergent, treat at 80℃ for 20min, and then neutralize with a solution containing 0.5g / L HAC. S9. Forming process: Temperature is 175℃, and speed is 18 Y / min.

[0058] Embodiment 3 of the present invention is: a digital printing color fastness enhancement treatment process adapted to 90wt% polyester and 10wt% cotton blended fabrics, the specific steps of which are as follows: S1. Refining and degreasing process: carried out at pH 8.5, with AFN 1.5g / L added, at a temperature of 100℃; S2. Pre-determined process: Temperature 200℃, speed 25 Y / min; S3. Drying process: Temperature 140℃, speed 25 Y / min, control the moisture content of the fabric to 10wt%; S4. Trim and straighten the fabric at the edges; S5. Digital direct-to-garment printing process: Using Inspire dispersible ink for printing, drying at 140℃, and then color development at 195℃; S6. Shaping and color fixing process: The temperature is 135℃, add 7wt% color fixing agent L2H2 according to the fabric weight ratio of 1:1, and the machine speed is 20Y / min; S7. Soap washing process: Soap wash in the tub, add soap detergent Sinmorle RC335 3g / L, temperature is 50℃, time is 30min; S8. Setting process: Temperature is 185℃, speed is 20 Y / min, and 0.3wt% citric acid and 0.5wt% CMK-815A are added during the setting process.

[0059] Embodiment 4 of the present invention is: a digital printing color fastness enhancement process adapted to nylon fabrics, the specific steps of which are as follows: S1. Refining and degreasing process: carried out at pH 7, with 1 g / L of AFN added at 75°C; S2. Pre-determined process: temperature 163℃, speed 25 Y / min; S3. Drying process: Temperature is 135℃, speed is 25Y / min, and the moisture content of the fabric is controlled to be below 1wt%. S4. Pretreatment process: Use a soda ash solution with a pH of 5.5. The soda ash solution is prepared 40 minutes before pretreatment. S5, edge trimming and fabric finishing; S6. Digital direct-to-garment printing process: Acid dye (Hongsam SILKMATE) is used for printing, and after drying at 90℃, it is steamed at 102℃ using a steamer. Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S7. Fixing and color-fixing process: When the temperature is 95℃, the pH is controlled at 5.5, add 7wt% color-fixing agent L2H2 according to the fabric weight ratio of 1:1, and the machine speed is 18Y / min; S8. Soap washing process: Soap wash in the tub, add soap detergent Sinmorle RC335 3g / L, temperature is 45℃, time is 30min; S9. Reduction cleaning process: Add 1.5g / L caustic soda, 4g / L sodium hydrosulfite, and 3g / L Sinmorle RC-335 soap detergent, treat at 80℃ for 20min, and then neutralize with a solution containing 0.5g / L HAC. S10. Heat setting process: Two-stage heat setting is carried out. The temperature of the first stage is 163℃, the temperature of the second stage is 178℃, and the speed is 19 Y / min. Add 0.5wt% citric acid and 0.5wt% CMK-815A during the molding process.

[0060] Embodiment 5 of the present invention is: a digital printing color fastness enhancement treatment process adapted to 90wt% nylon and 10wt% cotton blended fabrics, the specific steps of which are as follows: S1. Refining and degreasing process: carried out at pH 7, with 0.5 g / L of AFN added at 70°C; S2. Pre-determined process: temperature 160℃, speed 25 Y / min; S3. Drying process: Temperature is 130℃, speed is 25Y / min, and the moisture content of the fabric is controlled to be below 1wt%. S4. Pretreatment process: Use a soda ash solution with a pH of 5. The soda ash solution is prepared 30 minutes before pretreatment. S5, edge trimming and fabric finishing; S6. Digital direct-to-garment printing process: Acid dye (Hongsam SILKMATE) is used for printing, and after drying at 80℃, it is steamed at 100℃ using a steamer. S7. Fixing and color-fixing process: When the temperature is 90℃ and the pH is controlled between 5.0, add 7wt% color-fixing agent L2H2 according to the fabric weight ratio of 1:1, and the machine speed is 15Y / min; S8. Soap washing process: Soap wash in the tub, add soap detergent Sinmorle RC335 3g / L, temperature is 40℃, time is 30min; S9. Reduction cleaning process: Add 1.5g / L caustic soda, 4g / L sodium hydrosulfite, and 3g / L Sinmorle RC-335 soap detergent, treat at 80℃ for 20min, and then neutralize with a solution containing 0.5g / L HAC. S10. Heat setting process: Two-stage heat setting is carried out. The temperature of the first stage is 160℃ and the temperature of the second stage is 175℃. The speed of the machine is 18Y / min. 0.3wt% citric acid and 0.5wt% CMK-815A are added during the forming process.

[0061] Embodiment 6 of the present invention is: a digital printing color fastness enhancement treatment process suitable for 80wt% nylon, 10wt% polyester, and 10wt% cotton blended fabrics, the specific steps of which are as follows: S1. Refining and degreasing process: carried out at pH 7, with 1.5 g / L of AFN added, at a temperature of 80°C; S2. Pre-determined process: temperature 165℃, speed 25 Y / min; S3. Drying process: Temperature is 140℃, speed is 25Y / min, and the moisture content of the fabric is controlled to be below 1wt%. S4. Pretreatment process: Use a soda ash solution with a pH of 6. Prepare the soda ash solution 50 minutes before pretreatment. S5, edge trimming and fabric finishing; S6. Digital direct-to-garment printing process: Acid dye (Hongsam SILKMATE) is used for printing, and after drying at 100℃, it is steamed at 103℃ using a steamer. Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S7. Fixing and color fixing process: When the temperature is 100℃ and the pH is controlled between 6.0, add 7wt% fixing agent L2H2 according to the fabric weight ratio of 1:1, and the machine speed is 20Y / min; S8. Soap washing process: Soap wash in the tub, add soap detergent Sinmorle RC335 3g / L, temperature is 50℃, time is 30min; S9. Heat setting process: Two-stage heat setting is carried out. The temperature of the first stage is 165℃ and the temperature of the second stage is 180℃. The speed is 20 Y / min.

[0062] Embodiment 7 of the present invention is: a digital printing color fastness enhancement process adapted to cotton fabrics, the specific steps of which are as follows: S1. Refining and degreasing process: carried out at pH 12, with 1 g / L of AFN added at 95℃; S2. Drying process: Temperature 135℃, speed 25 Y / min, control the moisture content of the fabric to 15wt%; S3. Pre-treatment process: Caustic soda flakes are used, and the caustic soda flakes are prepared 40 minutes before the pre-treatment. S4. Trim and straighten the fabric at the edges; S5. Digital direct-to-garment printing process: Inspire active ink is used for printing, and after drying at 90℃, it is steamed at 101℃ using a steamer. Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S6. Forming process: Temperature is 95℃, speed is 19 Y / min; add 0.4wt% citric acid and 0.5wt% CMK-815A.

[0063] Embodiment 8 of the present invention is: a digital printing color fastness enhancement treatment process suitable for 85wt% cotton and 15wt% polyester blended fabrics, the specific steps of which are as follows: S1. Refining and degreasing process: carried out at pH 13, with 0.5 g / L of AFN added, at a temperature of 90°C; S2. Drying process: Temperature 130℃, speed 25 Y / min, control the moisture content of the fabric to 10wt%; S3. Pre-treatment process: Caustic soda flakes are used, and the caustic soda flakes are prepared 30 minutes before the pre-treatment. S4. Trim and straighten the fabric at the edges; S5. Digital direct-to-garment printing process: Inspire active ink is used for printing, and after drying at 80℃, it is steamed at 100℃ using a steamer. Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S6. Forming process: Temperature is 90℃, speed is 18Y / min; add 0.3wt% citric acid and 0.5wt% CMK-815A.

[0064] Embodiment 9 of the present invention is: a digital printing color fastness enhancement treatment process suitable for 90wt% cotton, 5wt% polyester, and 5wt% nylon blended fabrics, the specific steps of which are as follows: S1. Refining and degreasing process: carried out at pH 14, with AFN 1.5g / L added, at a temperature of 100℃; S2. Drying process: Temperature 140℃, speed 25 Y / min, control the moisture content of the fabric to 20wt%; S3. Pre-treatment process: Caustic soda flakes are used, and the caustic soda flakes are prepared 50 minutes before the pre-treatment. S4. Trim and straighten the fabric at the edges; S5. Digital direct-to-garment printing process: Inspire active ink is used for printing, and after drying at 100℃, it is steamed at 103℃ using a steamer. Fabrics for digital direct-to-garment printing are arranged from darkest to lightest colors. S6. Forming process: Temperature is 100℃, speed is 20 Y / min; add 0.5wt% citric acid and 0.5wt% CMK-815A.

[0065] Comparative Example 1 of the present invention is: The only difference between Comparative Example 1 and Example 1 is that the latter lacks an amorphous color-fixing process.

[0066] Comparative Example 2 of the present invention is: The only difference between Comparative Example 2 and Example 4 is that there is no soap washing process.

[0067] Comparative Example 3 of the present invention is: The only difference between Comparative Example 3 and Example 7 is that there is no pretreatment step.

[0068] Color fastness tests were conducted on the fabrics treated in Examples 1-9, and the results are shown in Table 1. Table 1

[0069] In summary, the digital inkjet printing color fastness enhancement process adapted to multiple fabrics provided by this invention lays the foundation for subsequent processes through a refining and degreasing process. If the degreasing is not thorough, it will lead to problems such as carbonization of the oil agent and uneven dyeing during pre-forming. Then, drying is performed before digital direct inkjet printing to avoid excessive moisture affecting the dyeing rate. After digital direct inkjet printing, a high-temperature setting process is performed to improve dimensional stability.

[0070] Each step is designed differently based on the fabric type, and pre-treatment, setting and color fixing and soaping processes are added differently according to the fabric type to improve the color fastness of the final product.

[0071] 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 using the present invention specification, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A digital printing color fastness enhancement process adaptable to multiple fabrics, characterized in that, It includes the refining and degreasing process, the drying process, the digital direct-to-garment printing process, and the setting process, which are carried out in sequence.

2. The digital printing color fastness enhancement process adaptable to multiple fabrics according to claim 1, characterized in that, When the fabric is made of polyester or nylon, it also includes a predetermined process between the refining and degreasing process and the drying process.

3. The digital printing color fastness enhancement process adaptable to multiple fabrics according to claim 1, characterized in that, When the fabric is made of nylon or cotton, it also includes a pretreatment process performed between the drying process and the digital direct-to-garment printing process.

4. The digital printing color fastness enhancement process adaptable to multiple fabrics according to claim 3, characterized in that, When the fabric is made of nylon, the pretreatment process uses a weakly acidic pretreatment solution; when the fabric is made of cotton, the pretreatment process uses an alkaline pretreatment solution.

5. The digital printing color fastness enhancement process adaptable to multiple fabrics according to claim 1, characterized in that, The fabric is trimmed and shaped before the digital direct-to-garment printing process.

6. The digital printing color fastness enhancement process adaptable to multiple fabrics according to claim 1, characterized in that, When the fabric is polyester, the digital direct-to-garment printing process is as follows: disperse dye is used for printing, and after drying at 100~140℃, the color is developed at 165~195℃.

7. The digital printing color fastness enhancement process adaptable to multiple fabrics according to claim 1, characterized in that, When the fabric is made of nylon, the digital direct-to-garment printing process is as follows: acid dye is used for printing, and after drying at 80~100℃, it is steamed at 100~103℃.

8. The digital printing color fastness enhancement process adaptable to multiple fabrics according to claim 1, characterized in that, When the fabric is cotton, the digital direct-to-garment printing process is as follows: using reactive dyes for printing, drying at 80~100℃, and then steaming at 100~103℃.

9. The digital printing color fastness enhancement process adaptable to multiple fabrics according to claim 1, characterized in that, When the fabric is made of polyester or nylon, it also includes a color-fixing process and a soaping process that are carried out sequentially between the digital direct-to-garment printing process and the setting process.

10. The digital printing color fastness enhancement process adaptable to multiple fabrics according to claim 1, characterized in that, When the fabric is made of a blend of at least two types of yarn, with yarn containing ≥80wt% as the main yarn, the processing technology is selected based on the material of the main yarn.

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