Environment-friendly digital printing and dyeing process

Abstract

The invention relates to an environment-friendly digital printing and dyeing process, which comprises the steps of fabric component detection, fabric pretreatment, digital design, ink jet printing, color fixation treatment, post-treatment, wastewater management and product inspection and packaging, and adopts environment-friendly water-based dye and natural dye, and an appropriate dye type is selected according to a detection result; the stability and the hand feeling of the fabric in the printing and dyeing process are ensured through the treatment steps of static electricity resistance, water washing, sizing, softening and the like, color fixation treatment is performed by adopting steam or hot pressing after ink jet printing, and the temperature is monitored in real time, so that the color durability is ensured; the subsequent wastewater management adopts classified collection, pretreatment, biological treatment, physical and chemical treatment and dye recovery, so that multi-stage wastewater treatment and energy reutilization are realized, and pollutant discharge is effectively reduced. The printing and dyeing environment-friendly effect is improved, dye recovery and energy reutilization are achieved, pollutant emission is reduced, and the product quality and color consistency are improved.

Description

Technical Field

[0001] The present application relates to the field of environmentally friendly digital printing and dyeing, and in particular to an environmentally friendly digital printing and dyeing process. Background Art

[0002] At present, printing and dyeing technology is widely used in the fields of textiles, clothing, etc., and is one of the core processes for giving fabrics color and patterns. Printing and dyeing technology transfers color or design patterns to the surface of fabrics through dyes and auxiliaries to achieve color fixation and display. However, the selection of dyes and the method of color fixation are crucial in practical applications. With the improvement of environmental protection requirements, printing and dyeing technology has received higher attention in terms of green materials and low-emission processes. Developing a process that can keep the pattern color bright and lasting while meeting environmental protection requirements has become the goal pursued by the industry.

[0003] Among the related technologies, some processes use water washing, color fixing and dye adhesion technology, but when applied, solvents or chemical additives are needed to achieve dye adhesion and color fixing. Wastewater is generated in the water washing step, and the residues of dyes and additives are difficult to handle. The improvement of color fixing effect and the control of dye adhesion, the treatment of wastewater and residual chemicals have become one of the key directions of current process improvement. Most industrial applications use water-based dyes and inkjet printing equipment combined with specific color fixing devices to enhance the dyeing effect and color durability.

[0004] With regard to the above-mentioned related technologies, the inventors believe that there are defects such as low printing and dyeing efficiency and insufficient handling of environmental issues in printing and dyeing production, which have an impact on the environment. In addition, the existing dryers used in printing and dyeing processes also consume too much energy. During the drying process, high-temperature and high-humidity water vapor is discharged, wasting energy. Summary of the invention

[0005] In order to improve the environmental impact problem during fabric printing and dyeing, the present application provides an environmentally friendly digital printing and dyeing process.

[0006] An environmentally friendly digital printing and dyeing process includes the following environmentally friendly digital printing and dyeing process, and the specific preparation steps of the environmentally friendly digital printing and dyeing process are as follows:

[0007] S1. Material testing: Use material testing equipment to accurately test the fabric composition of the blank textile fabrics that need to be printed and dyed.

[0008] Determine the corresponding environmentally friendly water-based dyes and natural fabric dyes according to the white fabric components obtained by testing;

[0009] S2. Fabric pretreatment: Send the fabric into the washing machine to clean the fabric to remove grease, impurities and dust.

[0010] The washed fabric is sent to the dryer for drying and then sent to the antistatic treatment equipment for antistatic treatment;

[0011] S3. Digital design: Use computers and auxiliary design software to design printing and dyeing patterns.

[0012] Convert the designed printing and dyeing pattern design files into a format suitable for digital printing presses and inkjet printers;

[0013] S4, inkjet printing:

[0014] The fabric is fed into a printing device connected to a digital inkjet printer, and the printing device is started. The digital inkjet printer sprays dyes according to the design file to print patterns, colors and texts on the fabric;

[0015] S5, color fixing treatment:

[0016] The fabric after inkjet printing is sent to the steam fixing device for fixing by heat pressing or steam fixing, and the temperature measuring component is used to detect and maintain the working temperature during fixing;

[0017] S6, post-processing: including cleaning, shaping, drying and softening;

[0018] a. Cleaning: Use an open-width washing machine for washing to remove unfixed dyes, auxiliaries and impurities, and use environmentally friendly detergents to clean the fabrics to remove excess dyes and chemicals;

[0019] b. Setting treatment: Use hot air setting machine or steam setting machine for setting treatment. Depending on the fabric, the fabric will be restored to shape under the action of steam or hot air at the set temperature and time.

[0020] c. Drying treatment: The fabric is sent to the suction cooling device for drying to remove excess moisture from the fabric after washing and shaping. The drying temperature is controlled at 60℃ to 80℃;

[0021] d. Softening treatment: Add environmentally friendly softener to the fabric after drying to improve the feel and comfort of the fabric;

[0022] S7. Wastewater management: The wastewater from steps S1-S5 should be sent to the wastewater treatment system for classification, pretreatment, biological treatment, physical and chemical treatment, dye recovery and reuse, and energy reuse.

[0023] a. Wastewater classification and collection: Different wastewater collection systems classify wastewater according to the source of cleaning, printing and dyeing, and color fixing. Different types of wastewater are initially separated before discharge to facilitate subsequent treatment.

[0024] b. Wastewater pretreatment: Preliminary treatment of wastewater by using sedimentation, filtration, and chemical agent addition to remove large particles and some pollutants.

[0025] c. Biological treatment: Establish a biological treatment system to degrade organic matter and pigments.

[0026] d. Physical and chemical treatment: According to the composition of wastewater, flocculation, sedimentation, filtration, oxidation-reduction physical and chemical methods are used for treatment.

[0027] e. Dye recovery and reuse: Dye residue recovery,

[0028] f. Effluent testing: Before wastewater is discharged, water quality testing is carried out to ensure that it meets the standards for reuse.

[0029] g. Energy recycling: recovery and reuse of heat energy in wastewater;

[0030] S8. Product inspection and packaging:

[0031] a. Color consistency detection: The colorimeter detects the color consistency, color uniformity and stability of printed and dyed products.

[0032] b. Physical performance test: The abrasion resistance, tensile strength and shrinkage of the fabric meet the standards.

[0033] c. Environmental testing: heavy metal content, pH value, volatile organic compound (VOC) testing,

[0034] d. Finished product inspection: inspection of finished product appearance.

[0035] By adopting the above technical solution,

[0036] Preferably, when the fabric treated in steps S1-S3 is subjected to inkjet printing in step S4, the temperature of the inkjet dye is between 30°C and 60°C.

[0037] By adopting the above technical solutions, through component detection, the fabric material can be accurately identified, and water-retaining dyes or natural dyes can be matched to ensure the environmental friendliness and applicability of the dyes and reduce the impact on the environment. The fabric is washed, dried and treated with anti-static treatment to remove impurities and static electricity, improve the stability and uniformity of subsequent dyeing and pattern printing, and lay a good foundation for subsequent processing. The computer is used to design the pattern and convert it into a format supported by a digital inkjet printer. High-precision pattern printing and dyeing are achieved through inkjet printing, which improves the pattern expression and accuracy of printing and dyeing. It is suitable for complex pattern design, and uses steam or hot pressing for color fixing treatment, and temperature control. The system maintains a stable fixing temperature to ensure that the dye is firmly attached, improves the durability and color persistence of the fabric, optimizes the post-processing process to make the fabric achieve the ideal touch and appearance, removes excess dyes and chemicals, and increases the softness and comfort of the fabric through environmentally friendly softeners. Wastewater is collected and treated in a classified manner, including reducing pollutant emissions and achieving resource reuse and recycling. The environmentally friendly digital printing and dyeing process not only improves the printing and dyeing effects and product quality of the fabric, but also greatly reduces pollutant emissions in the dyeing process, achieves dye recovery and energy reuse, and has significant environmental advantages and sustainability.

[0038] Preferably, when the fabric treated in steps S1-S4 is subjected to the setting treatment included in step S5, a steam setting machine is used to perform the fabric setting treatment, and the fabric is restored to shape under the action of steam or hot air at a set temperature and time according to different fabrics. The specific temperature and time are as follows:

[0039] Natural fibers: Temperature: between 100°C and 130°C, Time: 30 seconds to 2 minutes,

[0040] Synthetic fibers: temperature: between 150°C and 180°C, time: 20 seconds to 1 minute; blended fabrics: temperature: between 100°C and 160°C, time: 30 seconds to 1 minute.

[0041] By adopting the above technical scheme and setting different temperatures and times according to the type of fabric, it is possible to effectively avoid damage to the fabric caused by high temperature, ensure that the fabric recovers to the best shape under the action of steam or hot air, improve the stability, appearance quality and feel of the fabric, accurately control the temperature and time, complete the shaping process in a shorter time, reduce energy consumption, improve production efficiency, help the fabric maintain or restore its natural shape and structure, improve the flatness, wrinkle resistance and durability of the fabric, protect the fabric fibers, avoid the emission of harmful gases caused by excessive temperature, reduce the safety hazards in the processing process, and enhance the realization of green and environmentally friendly production goals.

[0042] Preferably, when executing step S2, the fabric after component detection is cleaned, and the composition of the environmentally friendly cleaning liquid for cleaning the fabric is as follows:

[0043] Plant-based surfactant: 15-25%;

[0044] Citric acid: 0.5-2%;

[0045] Sodium bicarbonate: 1-3%;

[0046] Essential oils: 0.2-1%;

[0047] Enzyme ingredients: 0.5-2%;

[0048] Phosphorus-free chelating agent: 0.5-1%;

[0049] Biodegradable solvents: 3-7%;

[0050] Natural thickener: 0.1-0.5%;

[0051] Clean water: balance.

[0052] By adopting the above technical scheme, the plant-based surfactant effectively reduces the surface tension of the fabric surface and enhances its cleaning ability for grease, impurities and dirt. The plant-based ingredients and essential oils provide natural and mild cleaning effects, avoid the damage of chemical cleaning agents to the environment and fabrics, and reduce the negative impact on aquatic organisms and the ecological environment. The combination of citric acid and sodium bicarbonate effectively removes mineral precipitation, hard scale and other inorganic dirt in the fabric, and maintains the cleanliness of the fabric. The enzyme components can decompose organic matter and further remove difficult-to-clean stains on the fabric. The phosphorus-free chelating agent effectively reduces the hardening phenomenon of the fabric during the cleaning process and maintains the softness and comfort of the fabric. The biodegradable solvent enhances the solubility and permeability of the cleaning solution, promotes the dissolution and removal of dyes or dirt, and makes the cleaning process more efficient. The natural thickener helps to adjust the viscosity of the cleaning solution, increase its adhesion on the fabric surface, ensure that the cleaning agent is evenly distributed, and prolong its cleaning action time. Clean water is used as a basic component to form an environmentally friendly cleaning solution. The environmentally friendly cleaning solution is suitable for cleaning a variety of fabrics, can provide a mild and effective cleaning effect, and at the same time maintain the original texture and color of the fabric.

[0053] The present application also provides a dryer to replace the traditional dryer and save energy waste in the production process of the above-mentioned environmentally friendly digital printing and dyeing process:

[0054] The dryer comprises a drying box, a feed inlet and a discharge port are respectively provided on both sides of the drying box, the feed inlet is used for feeding fabrics, the discharge port is used for discharging fabrics, a drying chamber is provided in the drying box, at least one hot air introduction structure is fixedly installed on the top of the drying box, a No. 1 air duct inserted into the drying chamber is installed on the hot air introduction structure, the hot air introduction structure has a heating component, an exhaust fan is fixedly installed on the side of the drying chamber, and a No. 2 air duct is installed on the exhaust fan:

[0055] Two rows of guide roller mechanisms are fixed in the drying chamber, and the guide roller mechanisms include air ducts fixed on the two side walls of the drying chamber, and the two air ducts are fixedly connected through a heating pipe, one of the air ducts is fixedly connected to the exhaust duct, and the other air duct is fixedly connected to the air inlet duct, one side of the exhaust duct is opened to connect to the outside space, and the air inlet duct is fixedly connected to the exhaust fan through the No. 3 air duct;

[0056] Wherein, the exhaust pipe is arranged on one side of the drying box and there are two of them, and the two exhaust pipes correspond to one of the guide roller mechanisms respectively, and the air inlet pipe is arranged on the other side of the air inlet pipe and there are two of them, and the two air inlet pipes correspond to one of the guide roller mechanisms respectively;

[0057] A conveying wheel is rotatably mounted on each of the air ducts through a bearing, and is used to set up the cloth on the heating pipe and the conveying wheel. The two rows of guide roller mechanisms are provided so that the cloth can be arranged in a wave shape in the drying chamber to optimize the drying effect. After the exhaust fan is started, the drying exhaust gas in the drying chamber is input from the No. 3 air duct into the air inlet pipe through the No. 2 air duct. The drying exhaust gas input into the air inlet pipe passes through one of the air ducts, the heating pipe and the other air duct and is finally discharged from the exhaust pipe, wherein the drying exhaust gas passing through the heating pipe will heat the cloth wrapped around the heating pipe.

[0058] Preferably, a heat insulation structure is fixedly installed in the heating tube, and the heating tube is divided into two air inlet spaces and a high temperature chamber by the heat insulation structure, wherein the two air inlet spaces are respectively connected to one of the air supply pipes, and the high temperature chamber is between the two air inlet spaces.

[0059] Preferably, the thermal insulation structure is in a vacuum state.

[0060] Preferably, the high temperature chamber in the upper row of guide roller mechanisms is located at the top of the heating tube, and the high temperature chamber in the lower row of guide roller mechanisms is located at the bottom of the heating tube, so that the high temperature chambers on the upper and lower sides can directly fit the contact position between the fabric and the heating tube.

[0061] Preferably, a No. 1 seal is installed between the air duct on one side and the drying box, and a No. 2 seal is installed between the air duct on the other side and the drying box.

[0062] In summary, the present application includes at least one of the following beneficial technical effects:

[0063] 1. Accurately detect the composition of fabrics to ensure the use of dyes that meet environmental protection requirements, reduce pollution to the environment, and ensure the environmental friendliness and applicability of dyes.

[0064] 2. Use environmentally friendly cleaning liquid to clean the fabric to remove impurities, grease and dust. The cleaning liquid uses natural plant ingredients and biodegradable solvents to avoid the damage of chemical cleaning agents to the environment and fabrics.

[0065] 3. Use computer-assisted digital inkjet printing to make the color or pattern more accurate and delicate, which is suitable for the printing and dyeing needs of complex patterns.

[0066] 4. Two rows of guide roller mechanisms are fixed in the drying chamber of the dryer of the present application. The guide roller mechanisms include air ducts fixed on the two side walls of the drying chamber. The two air ducts are fixedly connected through a heating pipe, one of which is fixedly connected to the exhaust duct, and the other is fixedly connected to the air inlet duct. One side of the exhaust duct is opened to connect to the outside space, and the air inlet duct is fixedly connected to the exhaust fan through the No. 3 air duct; wherein, the exhaust duct is arranged on one side of the drying box and there are two of them, and the two exhaust ducts correspond to one of the guide roller mechanisms respectively, and the air inlet duct is arranged on the other side of the air inlet duct and there are two of them, and the two air inlet ducts correspond to one of the guide roller mechanisms respectively; A conveying wheel is rotatably installed on each air duct through a bearing, and is used to set up the cloth on the heating pipe and the conveying wheel. The two rows of guide roller mechanisms are arranged so that the cloth can be arranged in a wave shape in the drying room to optimize the drying effect. After the exhaust fan is started, the drying exhaust gas in the drying room is input into the air inlet duct from the No. 3 air duct through the No. 2 air duct. The drying exhaust gas input into the air inlet duct passes through one of the air ducts, the heating pipe and the other air duct and is finally discharged from the exhaust duct. Among them, the drying exhaust gas passing through the heating pipe will heat the cloth wrapped on the heating pipe, so that the heat in the drying exhaust gas can be effectively utilized.

[0067] 5. An insulation structure is fixedly installed inside the heating pipe, which divides the heating pipe into two air inlet spaces and a high-temperature chamber. The two air inlet spaces are respectively connected to one of the air ducts. The high-temperature chamber is between the two air inlet spaces. The air inlet space is made as narrow as possible without affecting the exhaust gas to reduce heat loss, so that the heat of the drying exhaust gas is concentrated in the high-temperature chamber, thereby better drying the fabric.

[0068] 6. The high temperature chamber in the upper row of guide roller mechanisms is located at the top of the heating tube, and the high temperature chamber in the lower row of guide roller mechanisms is located at the bottom of the heating tube, so that the high temperature chambers on both sides can directly fit the contact position between the cloth and the heating tube, thereby providing a better drying effect for the cloth. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 is a flow chart of an environmentally friendly digital printing and dyeing process according to an embodiment of the present application;

[0070] Figure 2is a first schematic diagram of the appearance of the dryer according to an embodiment of the present application;

[0071] Figure 3 is a second schematic diagram of the appearance of the dryer according to an embodiment of the present application;

[0072] Figure 4 is a first cross-sectional schematic diagram of a dryer according to an embodiment of the present application;

[0073] Figure 5 is a second cross-sectional schematic diagram of the dryer according to an embodiment of the present application;

[0074] Figure 6 is a schematic diagram of the structure of a heating tube in a dryer according to an embodiment of the present application;

[0075] Figure 7 It is a schematic diagram of the structure of the conveying wheel in the dryer of the embodiment of the present application.

[0076] Explanation of the reference numerals in the accompanying drawings: 10. Drying box; 11. Exhaust duct; 12. No. 2 seal; 14. Discharge port; 15. No. 1 seal; 16. Inlet duct; 17. No. 3 air duct; 18. Feed port; 19. Drying chamber; 20. Heating tube; 21. High temperature chamber; 22. Insulation structure; 23. Hot air introduction structure; 24. No. 1 air duct; 25. Exhaust fan; 26. No. 2 air duct; 27. Air supply duct; 28. Conveying wheel; 29. ​​Bearing; 30. Air inlet space. DETAILED DESCRIPTION

[0077] The following is combined with Figure 1-7 This application is described in further detail.

[0078] The embodiment of the present application discloses an environmentally friendly digital printing and dyeing process.

[0079] Reference Figure 1 The specific preparation steps of the environmentally friendly digital printing and dyeing process are as follows:

[0080] S1. Material testing: Use material testing equipment to accurately test the fabric composition of the blank textile fabrics that need to be printed and dyed.

[0081] According to the white fabric composition obtained by testing, the corresponding environmentally friendly water-based dyes and natural fabric dyes are determined.

[0082] According to the test results of fabric components, environmentally friendly water-based dyes or natural fabric dyes are accurately selected, which are environmentally friendly and reduce pollution to water sources and air, meet the requirements of green production, and ensure the high compatibility of dyes and fabrics. When choosing water-based or natural dyes, the adsorption of fabrics and the affinity of dyes are fully optimized, making the dyeing effect fuller and more lasting, reducing the pollution of traditional chemical dyes to the environment. In the dyeing process, the water-based dyes and natural dyes used have low biodegradability and will not cause long-term pollution to water bodies and soil;

[0083] S2, fabric pretreatment: send the fabric to the washing machine for cleaning and removing grease, impurities and dust. Step S2 effectively removes pollutants such as grease, impurities and dust on the surface of the fabric, ensures the dye adsorption and uniformity of the fabric in the subsequent dyeing process, improves the combination of dye and fabric, reduces the problem of uneven dyeing or color difference, and ensures the quality of the final dyeing effect. After removing impurities and grease, the fabric surface is cleaner and has higher hydrophilicity and dye affinity. The cleaned fabric can better absorb dyes, improve the dyeing effect, and make the dyeing more uniform, deep and lasting, reducing fading and discoloration problems caused by poor dye adhesion. The washed fabric is sent to the dryer for drying and then sent to the antistatic treatment equipment for antistatic treatment, which effectively eliminates the static electricity accumulation of the fabric during the pretreatment process and prevents static electricity from affecting the dyeing process. During the washing and drying process, impurities and grease on the fabric surface are removed, which helps to reduce the phenomenon of fuzzing, broken silk, etc. caused by uneven fabric surface in the subsequent processing and dyeing process. Antistatic treatment can avoid damage or wear of fabrics caused by static electricity during drying and transportation, and maintain the integrity of fabrics. The washing and antistatic treatment in the pretreatment process not only provides a clean and uniform base for dyeing, but also lays a good foundation for subsequent finishing and drying processes, ensuring that the dyed fabric has excellent quality and effect. The washed fabric can interact with the dye faster, reducing the dyeing time. At the same time, antistatic treatment reduces the negative impact of static electricity on the fabric, which helps to improve the processing efficiency of subsequent processes, reduce unnecessary operational interference caused by static electricity, and improve the overall efficiency of the production line.

[0084] The ingredients of environmentally friendly cleaning liquid for fabric cleaning are as follows:

[0085] Plant-based surfactant: 15-25%;

[0086] Citric acid: 0.5-2%;

[0087] Sodium bicarbonate: 1-3%;

[0088] Essential oils: 0.2-1%;

[0089] Enzyme ingredients: 0.5-2%;

[0090] Phosphorus-free chelating agent: 0.5-1%;

[0091] Biodegradable solvents: 3-7%;

[0092] Natural thickener: 0.1-0.5%;

[0093] Purified water / deionized water: balance.

[0094] The plant-based surfactants in the environmentally friendly cleaning liquid can reduce the surface tension of water and effectively remove stains and grease without damaging the surface of the fabric. The enzyme components decompose protein and grease stains and have a good cleaning effect on sweat stains, blood stains, etc. Citric acid can effectively remove scale, sweat stains and odors by adjusting the pH value, and also has a certain softening effect. Lemon essential oil or tea tree oil has natural antibacterial and refreshing effects, which helps to deodorize. Biodegradable solvents are environmentally friendly and biodegradable, avoiding residual pollution of traditional chemical solvents. Phosphorus-free chelating agents are environmentally friendly alternatives that can avoid phosphorus pollution and improve decontamination and stability. Sodium bicarbonate can neutralize acidic components and protect fabric fibers from corrosion. Natural thickeners increase the viscosity of the liquid, enhance the coating effect, and make the cleaning liquid evenly cover the fabric, reducing the amount of cleaning liquid used.

[0095] S3. Digital design: Use computers and auxiliary design software to design printing and dyeing patterns, improve the accuracy and diversity of pattern design, achieve high-precision color finalization and pattern construction and modification, increase the diversity and uniqueness of printing and dyeing patterns, meet the market demand for personalized and customized patterns, greatly shorten the design cycle and improve design efficiency, reduce human errors, ensure consistency, and adapt to mass production and personalized customization, making the process more flexible. The digital design and direct output mode effectively reduces the consumption of intermediate samples and paper, avoids the waste of consumables caused by multiple samples in traditional processes, thereby achieving environmental protection and energy saving, and is easy to store, transmit and share. It not only improves the accuracy and consistency of design and production, but also enhances the flexibility and efficiency of production, reduces material waste, and adapts to the high efficiency, environmental protection and diversification needs of modern printing and dyeing processes;

[0096] S4, inkjet printing:

[0097] In step S4, the fabric is fed into a printing device connected to a digital inkjet printer. The temperature of the inkjet dye is between 30°C and 60°C. The digital inkjet printer sprays the dye according to the design file to print the pattern color and text on the fabric. The position and amount of the dye sprayed by the nozzle are accurately controlled to make the printed pattern have clear edges, rich details, uniform and saturated colors, and achieve high-resolution printing effects. Inkjet printing adopts an on-demand inkjet method, and only sprays dye in the required area of ​​the pattern, avoiding the waste caused by large-area dye laying and multiple coloring in traditional printing processes, saving materials, reducing sewage discharge, and achieving a green and environmentally friendly effect. The pattern can be quickly switched according to the design file, which is suitable for the production needs of multiple varieties and small batches, reducing the time for changing pictures or adjusting colors, and improving production efficiency. The high degree of color restoration is ensured through precise inkjet control, so that the actual printing effect is more consistent with the color in the design file. Inkjet printing is a non-contact printing method, which avoids indentation or mechanical damage to the fabric surface, and is more suitable for some fabrics with higher requirements on the fabric surface, such as silk, cotton and linen. Contactless printing protects the softness and comfort of fabrics, maintains the natural texture of fabrics, is applicable to a variety of fabric materials, reduces intermediate links, shortens the process flow, and achieves high-precision, high-reduction and environmentally friendly printing of colors or patterns, while improving production efficiency and saving materials and time;

[0098] S5, color fixing treatment:

[0099] The fabric after inkjet printing is sent to the steam fixing device for fixing by heat pressing or steam fixing, and the temperature measuring component is used to detect and maintain the working temperature during fixing;

[0100] Depending on the fabric, the fabric is restored to shape under the action of steam or hot air at the set temperature and time. The specific temperature and time are as follows:

[0101] Natural fibers: Temperature: between 100°C and 130°C, Time: 30 seconds to 2 minutes,

[0102] Synthetic fibers: temperature: between 150°C and 180°C, time: 20 seconds to 1 minute; blended fabrics: temperature: between 100°C and 160°C, time: 30 seconds to 1 minute.

[0103] In step S5, the printed fabric is subjected to heat pressing or steam fixing treatment through the fixing device, which can effectively fix the dye molecules, improve the fabric's resistance to water washing and friction, improve color fastness, prevent the migration or shedding of the dye on the fabric surface, ensure that the pattern is bright and does not fade, and extend the service life and appearance quality of the fabric. The temperature measuring component is used to monitor and maintain the working temperature during the fixing process in real time to avoid the influence of temperature fluctuations on the fixing effect, ensure the uniformity and stability of the fixing, and improve the reliability of the printing and dyeing effect. Through the automated temperature detection and control equipment, manual intervention is reduced, and efficient and stable fixing operation is achieved, thereby improving the continuity and efficiency of the production process;

[0104] S6, post-processing: including cleaning, shaping, drying and softening;

[0105] a. Cleaning: Use an open-width washing machine for washing to remove unfixed dyes, auxiliaries and impurities, and use environmentally friendly detergents to clean the fabrics to remove excess dyes and chemicals;

[0106] b. Setting treatment: Use hot air setting machine or steam setting machine for setting treatment. Depending on the fabric, the fabric will be restored to shape under the action of steam or hot air at the set temperature and time.

[0107] c. Drying treatment: The fabric is sent to the suction cooling device for drying to remove excess moisture from the fabric after washing and shaping. The drying temperature is controlled at 60℃ to 80℃;

[0108] d. Softening treatment: Add environmentally friendly softener to the fabric after drying to improve the feel and comfort of the fabric;

[0109] The cleaning treatment in step S6 effectively removes unfixed dyes and residual chemicals, ensures color uniformity and stability, avoids fading problems caused by dye migration in subsequent use, improves the overall durability of the fabric, and uses hot air or steam to shape the fabric to restore its original shape and dimensional stability, reducing the shrinkage and deformation of the fabric. The fabric is dried at an appropriate temperature through a precise temperature-controlled suction cooling device to prevent high temperature from damaging the fiber. At the same time, excess water is removed to make the fabric reach a suitable moisture content, which is conducive to subsequent storage and use. The use of environmentally friendly softeners improves the touch of the fabric, making it softer and smoother, meeting consumers' demand for comfort and high-quality fabrics. Environmentally friendly detergents and low-temperature drying treatments are used to reduce pollution to the environment and save energy consumption, which is in line with the green production concept and achieves the goal of energy saving and consumption reduction.

[0110] S7. Wastewater management: The wastewater from steps S1-S5 should be sent to the wastewater treatment system for classification, pretreatment, biological treatment, physical and chemical treatment, dye recovery and reuse, and energy reuse.

[0111] a. Wastewater classification and collection: Different wastewater collection systems classify wastewater according to the source of cleaning, printing and dyeing, and color fixing. Different types of wastewater are initially separated before discharge to facilitate subsequent treatment.

[0112] b. Wastewater pretreatment: Preliminary treatment of wastewater by using sedimentation, filtration, and chemical agent addition to remove large particles and some pollutants.

[0113] c. Biological treatment: Establish a biological treatment system to degrade organic matter and pigments.

[0114] d. Physical and chemical treatment: According to the composition of wastewater, flocculation, sedimentation, filtration, oxidation-reduction physical and chemical methods are used for treatment.

[0115] e. Dye recovery and reuse: Dye residue recovery,

[0116] f. Effluent testing: Before wastewater is discharged, water quality testing is carried out to ensure that it meets the standards for reuse.

[0117] g. Energy recycling: recovery and reuse of heat energy in wastewater;

[0118] Step S7 collects wastewater by classification, performs preliminary separation and pretreatment on wastewater from different sources, reduces the complexity and cost of subsequent treatment processes, and improves the overall efficiency of wastewater treatment. Sedimentation, filtration, flocculation, and oxidation-reduction multiple treatment methods can effectively remove particulate matter, organic matter, pigments, and harmful chemicals in wastewater, reduce pollutant emissions, and prevent water pollution. The biological treatment process uses microorganisms to decompose organic matter and pigments to achieve a green and environmentally friendly degradation method, while avoiding the use of high-pollution treatment methods, which is conducive to the sustainable treatment of water quality. The remaining dyes after recycling and treatment are reused, which not only reduces the cost of printing and dyeing, but also reduces the impact of waste dyes on the environment, and realizes the recycling of resources. The effluent test ensures that the quality of the treated wastewater meets the emission standards and reduces pollution to surrounding water bodies. The heat in the wastewater is reused through the heat recovery device, which saves energy and reduces heating requirements during the production process, which helps to reduce carbon emissions and achieve low-carbon and environmentally friendly production goals.

[0119] S8. Product inspection and packaging:

[0120] a. Color consistency detection: The colorimeter detects the color consistency, color uniformity and stability of printed and dyed products.

[0121] b. Physical performance test: The abrasion resistance, tensile strength and shrinkage of the fabric meet the standards.

[0122] c. Environmental testing: heavy metal content, pH value, volatile organic compound (VOC) testing,

[0123] d. Finished product inspection: finished product appearance inspection;

[0124] Step S8 uses a colorimeter to accurately detect the color consistency and uniformity of the printed and dyed products, effectively ensuring the color stability between batches and finished products. Through physical property tests such as abrasion resistance, tensile strength, and shrinkage, the durability and stability of the fabric during use are ensured, and the product life is extended. Environmental testing of heavy metal content, pH value, and volatile organic compounds (VOC) ensures the safety and low pollution characteristics of the product, helps protect consumer health, and complies with environmental protection regulations and standards. The appearance inspection of the finished product ensures that the finished product is flawless, free of pollutants, and free of obvious damage, thereby improving the appearance quality and market competitiveness of the product.

[0125] The implementation principle is as follows: professional equipment is used to accurately test the composition of textile fabric blanks, and suitable water-based or natural dyes are selected based on the test results. The dyes have low biodegradability and can effectively reduce the pollution to water and soil. The affinity between dyes and fabrics is optimized to ensure that the dyeing effect is full and lasting. The fabrics are washed in a washing machine to remove grease, impurities and dust, ensure uniform adhesion of dyes, reduce color difference problems, and avoid static electricity interference in the dyeing process through antistatic treatment. Environmentally friendly cleaning liquids include plant-based surfactants, citric acid, sodium bicarbonate, etc., which can effectively remove dirt without damaging fabrics. Computer-aided design software is used to design printing and dyeing colors or patterns, which can improve the accuracy and efficiency of pattern design, shorten the design cycle, and reduce waste. The consumption of materials and paper is reduced. Inkjet technology is used for digital printing. Inkjet dyes are sprayed within a temperature range of 30℃-60℃. The spraying amount and position of the dyes are precisely controlled to ensure uniform and saturated colors. Inkjet on demand reduces dye waste. The non-contact process protects the fabric surface from damage. Steam or hot pressing equipment is used to fix the printed fabric to ensure that the dyes are firmly attached to the fabric and improve color fastness and durability. It includes cleaning, shaping, drying and softening treatment. Environmentally friendly cleaning agents are used to remove unfixed dyes. Shaping and drying treatments ensure that the fabrics restore their shape, stabilize their size, and improve the touch. The wastewater generated during the printing and dyeing process is treated by multiple methods such as classification, pretreatment, and biological treatment to ensure that the wastewater meets the reuse standards. The residual dyes are recycled and reused to avoid waste, and energy is reused through heat recovery equipment, which reduces production energy consumption, optimizes dyeing effects, greatly reduces pollutant emissions and resource waste, meets green environmental protection requirements, and promotes sustainable industrial applications.

[0126] The embodiment of the present application also improves the above-mentioned dryer to overcome the problem of excessive energy waste in traditional dryers, specifically:

[0127] Reference Figure 2-Figure 7The dryer comprises a drying box 10, and a feed port 18 and a discharge port 14 are respectively provided on both sides of the drying box 10, the feed port 18 is used to feed fabric, and the discharge port 14 is used to discharge fabric. A drying chamber 19 is provided in the drying box 10, and at least one hot air introduction structure 23 is fixedly installed on the top of the drying box 10, and a No. 1 air duct 24 inserted into the drying chamber 19 is installed on the hot air introduction structure 23, and the hot air introduction structure 23 has a heating component, and air is sucked in and heated by the hot air introduction structure 23. , the cloth in the drying chamber 19 is dried through the No. 1 air duct 24, an exhaust fan 25 is fixedly installed on the side of the drying chamber 19, and a No. 2 air duct 26 is installed on the exhaust fan 25. After the exhaust fan 25 is started, the hot and humid exhaust gas after the cloth is dried in the drying chamber 19 can be discharged through the No. 2 air duct 26; the above structure is basically matched in the existing dryers, but the existing dryers directly discharge the hot and humid exhaust gas after drying, which causes energy waste in vain. Based on this, the applicant has made improvements, specifically:

[0128] Two rows of guide roller mechanisms are fixed in the drying chamber 19, and the guide roller mechanisms include air ducts 27 fixed on the two side walls of the drying chamber 19, and the two air ducts 27 are fixedly connected through the heating pipe 20, one of the air ducts 27 is fixedly connected to the exhaust pipe 11, and the other air duct 27 is fixedly connected to the air inlet pipe 16, one side of the exhaust pipe 11 is opened to connect to the outside space, and the air inlet pipe 16 is fixedly connected to the exhaust fan 25 through the No. 3 air duct 17;

[0129] The exhaust pipe 11 is arranged on one side of the drying box 10 and there are two of them, and the two exhaust pipes 11 correspond to one of the guide roller mechanisms respectively, and the air inlet pipe 16 is arranged on the other side of the air inlet pipe 16 and there are two of them, and the two air inlet pipes 16 correspond to one of the guide roller mechanisms respectively;

[0130] A conveying wheel 28 is rotatably mounted on each of the air delivery pipes 27 through a bearing 29, and is used to set up the cloth on the heating pipe 20 and the conveying wheel 28. The two rows of the guide roller mechanism are arranged so that the cloth can be arranged in the drying chamber 19 in a wave shape to optimize the drying effect. After the exhaust fan 25 is started, the drying exhaust gas in the drying chamber 19 is input from the No. 3 air duct 17 into the air inlet pipe 16 through the No. 2 air duct 26. The drying exhaust gas input into the air inlet pipe 16 passes through one of the air delivery pipes 27, the heating pipe 20 and the other air delivery pipe 27 and is finally discharged from the exhaust pipe 11. The drying exhaust gas passing through the heating pipe 20 heats the cloth wound on the heating pipe 20, so that the heat in the drying exhaust gas can be effectively utilized.

[0131] Furthermore, in order to enhance the heating effect of the drying exhaust gas passing through the heating tube 20, the heating tube 20 is optimized, specifically:

[0132] A heat insulation structure 22 is fixedly installed in the heating tube 20, and the heating tube 20 is divided into two air inlet spaces 30 and a high temperature chamber 21 by the heat insulation structure 22, wherein the two air inlet spaces 30 are respectively connected to one of the air delivery pipes 27, and the high temperature chamber 21 is between the two air inlet spaces 30. The air inlet space 30 is made as narrow as possible without affecting the exhaust gas, so as to reduce heat loss, so that the heat of the drying exhaust gas is concentrated in the high temperature chamber 21, thereby better drying the fabric;

[0133] Furthermore, the heat insulation structure 22 is made into a vacuum state to prevent the heat of the drying exhaust gas from being lost from the heat insulation structure 22 .

[0134] In addition, the high temperature chamber 21 in the upper row of guide roller mechanisms is located at the top of the heating tube 20, and the high temperature chamber 21 in the lower row of guide roller mechanisms is located at the bottom of the heating tube 20, so that the high temperature chambers 21 on the upper and lower sides can directly fit the contact position between the cloth and the heating tube 20, thereby providing a better drying effect for the cloth.

[0135] In addition, a first seal 15 is installed between the air duct 27 and the drying box 10 on one side, and a second seal 12 is installed between the air duct 27 and the drying box 10 on the other side.

[0136] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An environmentally friendly digital printing and dyeing process, comprising the following environmentally friendly digital printing and dyeing process, characterized in that: The specific preparation steps of the environmentally friendly digital printing and dyeing process are as follows: S1. Material testing: Use material testing equipment to accurately test the fabric composition of the blank textile fabrics that need to be printed and dyed. Determine the corresponding environmentally friendly water-based dyes and natural fabric dyes according to the white fabric components obtained by testing; S2. Fabric pretreatment: Send the fabric into the washing machine to clean the fabric to remove grease, impurities and dust. The washed fabric is sent to the dryer for drying and then sent to the antistatic treatment equipment for antistatic treatment; S3. Digital design: Use computers and auxiliary design software to design printing and dyeing patterns. Convert the designed printing and dyeing pattern design files into a format suitable for digital printing presses and inkjet printers; S4, inkjet printing: The fabric is fed into a printing device connected to a digital inkjet printer, and the printing device is started. The digital inkjet printer sprays dyes according to the design file to print patterns, colors and texts on the fabric; S5, color fixing treatment: The fabric after inkjet printing is sent to the steam fixing device for fixing by heat pressing or steam fixing, and the temperature measuring device is used to detect and maintain the working temperature during fixing; S6, post-processing: including cleaning, shaping, drying and softening; a. Cleaning: Use an open-width washing machine for washing to remove unfixed dyes, auxiliaries and impurities, and use environmentally friendly detergents to clean the fabrics to remove excess dyes and chemicals; b. Setting treatment: Use hot air setting machine or steam setting machine for setting treatment. Depending on the fabric, the fabric will be restored to shape under the action of steam or hot air at the set temperature and time. c. Drying treatment: The fabric is sent to the suction cooling device for drying to remove excess moisture from the fabric after washing and shaping. The drying temperature is controlled at 60℃ to 80℃; d. Softening treatment: Add environmentally friendly softener to the fabric after drying to improve the feel and comfort of the fabric; S7. Wastewater management: The wastewater from steps S1-S5 should be sent to the wastewater treatment system for classification, pretreatment, biological treatment, physical and chemical treatment, dye recovery and reuse, and energy reuse. a. Wastewater classification and collection: Different wastewater collection systems classify wastewater according to the source of cleaning, printing and dyeing, and color fixing. Different types of wastewater are initially separated before discharge to facilitate subsequent treatment. b. Wastewater pretreatment: Preliminary treatment of wastewater by using sedimentation, filtration, and chemical agent addition to remove large particles and some pollutants. c. Biological treatment: Establish a biological treatment system to degrade organic matter and pigments. d. Physical and chemical treatment: According to the composition of wastewater, flocculation, sedimentation, filtration, oxidation-reduction physical and chemical methods are used for treatment. e. Dye recovery and reuse: Dye residue recovery, f. Effluent testing: Before wastewater is discharged, water quality testing is carried out to ensure that it meets the standards for reuse. g. Energy recycling: recovery and reuse of heat energy in wastewater; S8. Product inspection and packaging: a. Color consistency detection: The colorimeter detects the color consistency, color uniformity and stability of printed and dyed products. b. Physical performance test: The abrasion resistance, tensile strength and shrinkage of the fabric meet the standards. c. Environmental testing: heavy metal content, pH value, volatile organic compound (VOC) testing, d. Finished product inspection: inspection of finished product appearance.

2. An environmentally friendly digital printing and dyeing process according to claim 1, characterized in that: When the fabric treated in steps S1-S3 is subjected to inkjet printing in step S4, the temperature of the inkjet dye is between 30°C and 60°C.

3. An environmentally friendly digital printing and dyeing process according to claim 1, characterized in that: When the fabric treated in steps S1-S4 is subjected to the setting treatment included in step S5, a steam setting machine is used to perform the fabric setting treatment. The fabric is restored to shape under the action of steam or hot air at a set temperature and time according to different fabrics. The specific temperature and time are as follows: Natural fibers: Temperature: between 100°C and 130°C, Time: 30 seconds to 2 minutes, Synthetic fiber: Temperature: between 150℃ and 180℃, Time: 20 seconds to 1 minute, Blended fabrics: Temperature: between 100℃ and 160℃, Time: from 30 seconds to 1 minute.

4. The environmentally friendly digital printing and dyeing process according to claim 1, characterized in that: When executing step S2, the fabric after component detection is cleaned, and the composition of the environmentally friendly cleaning liquid for fabric cleaning is as follows: Plant-based surfactant: 15-25%; Citric acid: 0.5-2%; Sodium bicarbonate: 1-3%; Essential oils: 0.2-1%; Enzyme ingredients: 0.5-2%; Phosphorus-free chelating agent: 0.5-1%; Biodegradable solvents: 3-7%; Natural thickener: 0.1-0.5%; Purified water / deionized water: balance.

5. The dryer according to claim 1 comprises a drying box (10), wherein a feed port (18) and a discharge port (14) are respectively provided on both sides of the drying box (10), wherein the feed port (18) is used for feeding fabrics, and the discharge port (14) is used for discharging fabrics, wherein a drying chamber (19) is provided in the drying box (10), wherein at least one hot air introduction structure (23) is fixedly mounted on the top of the drying box (10), wherein a first air duct (24) inserted into the drying chamber (19) is mounted on the hot air introduction structure (23), wherein the hot air introduction structure (23) has a heating component built therein, wherein an exhaust fan (25) is fixedly mounted on the side of the drying chamber (19), wherein a second air duct (26) is mounted on the exhaust fan (25), wherein: Two rows of guide roller mechanisms are fixed in the drying chamber (19), and the guide roller mechanisms include air delivery pipes (27) fixed on the two side walls of the drying chamber (19). The two air delivery pipes (27) are fixedly connected via a heating pipe (20), one of the air delivery pipes (27) is fixedly connected to the exhaust pipe (11), and the other of the air delivery pipes (27) is fixedly connected to the air inlet pipe (16). One side of the exhaust pipe (11) is opened to connect to the outside space, and the air inlet pipe (16) is fixedly connected to the exhaust fan (25) via the No. 3 air pipe (17); The exhaust pipe (11) is arranged on one side of the drying box (10) and there are two of them, and the two exhaust pipes (11) correspond to one of the guide roller mechanisms respectively; the air inlet pipe (16) is arranged on the other side of the air inlet pipe (16) and there are two of them, and the two air inlet pipes (16) correspond to one of the guide roller mechanisms respectively; A conveying wheel (28) is rotatably mounted on each of the air delivery pipes (27) via a bearing (29), and is used to support fabric on the heating pipe (20) and the conveying wheel (28). The two rows of guide roller mechanisms are arranged so that the fabric can be arranged in a wave-like manner in the drying chamber (19) to optimize the drying effect. After the exhaust fan (25) is started, the drying exhaust gas in the drying chamber (19) is input from the No. 3 air pipe (17) into the air inlet pipe (16) via the No. 2 air pipe (26). The drying exhaust gas input into the air inlet pipe (16) passes through one of the air delivery pipes (27), the heating pipe (20) and the other of the air delivery pipes (27) and is finally discharged from the exhaust pipe (11), wherein the drying exhaust gas passing through the heating pipe (20) heats the fabric wound on the heating pipe (20).

6. The dryer according to claim 5, characterized in that: A heat insulation structure (22) is fixedly installed in the heating pipe (20), and the heat insulation structure (22) divides the heating pipe (20) into two air inlet spaces (30) and a high-temperature chamber (21), wherein the two air inlet spaces (30) are respectively connected to one of the air supply pipes (27), and the high-temperature chamber (21) is between the two air inlet spaces (30).

7. The dryer according to claim 6, characterized in that: The heat insulation structure (22) is in a vacuum state.

8. The dryer according to claim 6, characterized in that: The high temperature chamber (21) in the upper row of the guide roller mechanisms is located at the top of the heating tube (20), and the high temperature chamber (21) in the lower row of the guide roller mechanisms is located at the bottom of the heating tube (20), so that the high temperature chambers (21) on both the upper and lower sides can directly fit the contact position between the fabric and the heating tube (20).

9. The dryer according to claim 5, characterized in that: A first sealing member (15) is installed between the air supply pipe (27) and the drying box (10) on one side, and a second sealing member (12) is installed between the air supply pipe (27) and the drying box (10) on the other side.

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