Open-width continuous dyeing and finishing process method for knitted fabric

Abstract

The invention relates to the technical field of knitted fabric dyeing and finishing, in particular to a knitted fabric open-width continuous dyeing and finishing process method. The open-width continuous dyeing and finishing process method for the knitted fabric comprises the following treatment steps: (1) pretreatment of the knitted fabric: impregnating the knitted fabric with a degreaser to remove oil, and then pre-washing; dipping in a bleaching auxiliary agent, and then carrying out open-width washing; (2) tentering, drying and heat setting, wherein the water carrying rate of the bleached cloth is 40-50% after the bleached cloth passes through a drying machine; tentering drying is conducted in a tentering drying machine, and after the cloth is dried, the moisture content is controlled to be 8%-15%; (3) open-width unwinding and dyeing: operating a knitted fabric dyeing machine after stentering, drying and heat setting, heating the dyeing finishing liquid to 100-120 DEG C at a speed of 1-3 DEG C / min, keeping the temperature for 1-3 hours, cooling to 50-60 DEG C at a speed of 5-8 DEG C / min, discharging residual liquid of the dyeing finishing liquid, and storing the fabric for 45-60 minutes; (4) color fixation: carrying out padding, steaming and color fixation on the color fixation liquid at the temperature of 100-105 DEG C for 45-60 minutes; (5) washing and drying: after spray washing, carrying out three times of drying, namely infrared drying, roller drying and tentering drying; and packaging finished products. The open-width continuous dyeing and finishing process method for the knitted fabric has the advantages that the dyeing and finishing efficiency is high, the environment-friendly performance is good, the bleaching, dyeing and color fixing effects of the fabric are good, the fabric is flat, few creases exist, and marketization development can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of dyeing and finishing of knitted fabrics, and in particular to a method for open-width continuous dyeing and finishing of knitted fabrics. Background Art

[0002] Due to the particularity of knitted fabrics, knitted fabric printing and dyeing has always adopted the traditional dyeing vat dyeing production process, which mainly includes three stages: rinsing before dyeing, dyeing, and soaping after dyeing, all of which are completed in the dyeing vat. However, its production efficiency, energy consumption of water, electricity and gas, and the severity of pollution have not been fundamentally solved. It is still the industry with the highest pollution and energy consumption among all industries, which seriously hinders the development and progress of society, harms the survival and reproduction of mankind, increases additional costs and energy consumption, and the pollution caused by printing and dyeing can only be treated at a high cost.

[0003] In the current intermittent and rope-shaped knitted fabric bleaching and dyeing process, when the fabric passes through the bleaching machine, the fabric is in a free state and passes through the saturated steam bleaching box. Although this solution can meet the production requirements to a certain extent, this type of bleaching machine is not only inefficient, but also has poor bleaching quality and dyeing quality of the fabric, and the fabric is seriously damaged, wrinkled, scratched, etc. The improvement and reform of the intermittent and rope-shaped knitted fabric bleaching and dyeing process has become a must. Since water is the only medium for printing and dyeing at present, if you want to change the current situation of this industry, the only way is to reduce water use or not use water. Based on the principle of reducing water use, it is necessary to start with changing the processing method, thereby providing technical guarantee for the knitted fabric to achieve the goal of high-quality and low-consumption bleaching and dyeing process. The application of knitted fabric open-width continuous bleaching and dyeing process and process equipment has gradually become a trend. Summary of the invention

[0004] Aiming at the problems that the current intermittent and rope-shaped knitted fabric bleaching and dyeing processes are not only inefficient, energy-intensive and highly polluting, but also have poor bleaching and dyeing fixation effects, and the fabric is damaged and wrinkled, the present application provides a knitted fabric open-width continuous dyeing and finishing process method.

[0005] In a first aspect, the present application provides a knitted fabric open-width continuous dyeing and finishing process method, which adopts the following technical solution: A knitted fabric open width continuous dyeing and finishing process method, comprising the following processing steps: (1) Pretreatment of knitted fabrics: The fabric is immersed in a degreasing agent to remove oil, then placed in a reaction box for reaction at 85-95°C for 2-4 minutes, and pre-washed; then immersed in a bleaching agent, placed in a steamer for reaction for 20-25 minutes; then placed in an open-width washing box; (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 40-50%; the fabric is tenter dried in the tenter dryer, and the moisture content of the fabric after drying is controlled at 8-15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100-120°C at a rate of 1-3°C / min, maintain the temperature for 1-3h, then lower the temperature to 50-60°C at a rate of 5-8°C / min, drain the residual liquid of the dyeing finishing liquid, and store the fabric for 45-60min; (4) Fixing: Padding with fixing solution, the liquid content of the fabric after extrusion by the fixing solution padding device is 75-95%; steaming fixing, temperature 100-105°C, steaming for 45-60 minutes; (5) Washing and drying: The spray flow rate is 2.0-3.0L / kg. After spray washing, the fabric enters three drying stages: infrared drying, with the moisture content of the fabric at 75-65%; roller drying, with the moisture content of the fabric at 40-50%; stenter drying, with the moisture content of the fabric controlled at 5-8%; and finished product packaging.

[0006] By adopting the above technical scheme, degreasing pretreatment is the first important step to improve the water absorption and whiteness of the knitted fabric. By degreasing, the spinning oil and impurities on the grey cloth will be thoroughly washed away. After pre-washing, the fabric will be impregnated with bleach, and then steamed in a knitted fabric steamer, and then continuously washed, and then the knitted fabric is flattened by spraying, and then heat-set by tenter drying, so that the knitted fabric can be better dyed and penetrated, and more penetrants are added to avoid damaging the fibers of the knitted fabric. Tenter drying has an important anti-wrinkle effect. Then, through dyeing, cloth storage and steaming fixation, the dyeing and fixing effect of the knitted fabric is guaranteed, high energy consumption and environmental pollution are avoided, and it has the effect of anti-wrinkle and anti-crease. Water vapor is used to increase the temperature of the fabric, the fiber swells, and the dye diffuses into the fiber and fixes to the fiber after reacting with the chemical. The whole process greatly improves the dyeing and fixing rate, and improves the energy utilization rate and the utilization rate of the dye.

[0007] In a specific embodiment, the bleaching aid is 0.5-0.8 g / L tetraacetylethylenediamine, 0-3 g / L sodium alkyl alcohol ether sulfate, and 3-6 g / L sodium carbonate.

[0008] By adding environmentally friendly tetraacetylethylenediamine to water, the fabric is bleached by reduction dyeing. The bleached fabric has bright color and is not easy to fade. It also removes the natural oil of knitted fabrics, improves the smoothness and bundling (cohesion) of the fabric, reduces the surface tension of the fiber, and enhances the softness of the fabric.

[0009] In a specific possible implementation manner, the open-width washing is to allow the knitted fabric to enter the squeezing roller in an open-width state, and to perform efficient water washing by a pump spray circulation.

[0010] The high-efficiency water washing is hot water washing at 60-70°C for 15-20 minutes, followed by cold water washing for 15-20 minutes and dehydration.

[0011] By making the knitted fabric enter the squeezing roller in a flat state, wrinkles are avoided, and the squeezing of the squeezing roller plays the role of dehydrating the bleaching liquid.

[0012] The dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, with water as the system and a bath ratio of 1:20-25.

[0013] By adding fatty alcohol polyoxyethylene ether into the dyeing and finishing liquid, it has good emulsifying and dispersing properties and a dyeing-promoting effect, preventing the dyeing and finishing liquid from being contaminated and discolored during dyeing, and helping to protect the color from damage; plant rose essence dye has the characteristics of high color development efficiency and good environmental performance. When sodium salt is added, sodium ions will form an electrolytic layer on the surface of the fiber, neutralizing the negative charge of the knitted fiber and reducing the repulsion between the dye and the fiber, thereby playing a role in promoting dyeing. Through a reasonable dyeing process, the quality of the dyed material is significantly improved and the performance is further optimized.

[0014] In a specific embodiment, the mass ratio of the fatty alcohol polyoxyethylene ether, the sodium salt solution and the plant rose essence dye is (2-4):1:(5-8).

[0015] By adopting the above technical scheme, the fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye are mixed for dyeing, so that the penetration color development effect is good, the long chain of the fatty alcohol polyoxyethylene ether can penetrate into the plant fiber, get entangled and fixed, so that the movement of the knitted fabric fiber is restricted, the shrinkage resistance of the fabric is improved, and the breaking strength of the knitted fabric is improved. Too much sodium salt solution will reduce the skin-friendly comfort of the fabric.

[0016] In a specific embodiment, the tentering temperature of the tentering drying is 140-150° C., and the time is 36-45 seconds.

[0017] In a specific embodiment, the fixing solution comprises sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:(2-4).

[0018] By adopting the above technical scheme, the color fastness can be improved through the chelating and fixing effect of sodium ethylenediaminetetraacetic acid and the color retention effect of 2,4-dihydroxybenzophenone, without the need to use sodium sulfate or urea, reducing the pollution emissions of floating color and dyeing process, improving the stability of dyeing process control, improving the energy utilization rate and the utilization rate of dyes, and without the need for complex temperature and humidity control, thereby achieving greater energy-saving and consumption-reducing benefits.

[0019] In summary, this application has the following beneficial effects: 1. Degreasing pretreatment is an important first step to improve the water absorption and whiteness of knitted fabrics. Through degreasing, the spinning oil and impurities on the grey cloth will be thoroughly washed away. After pre-washing, the fabric will be impregnated with bleach, and then steamed in a knitted fabric steamer, and then continuously washed and sprayed to make the knitted fabric flat. Then, through tenter drying and heat setting, the knitted fabric can be better dyed and penetrated, avoiding adding more penetrants to damage the fibers of the knitted fabric. Tenter drying has an important anti-wrinkle effect. Then, through dyeing, cloth storage and steaming fixation, the dyeing and fixing effect of the knitted fabric is guaranteed, high energy consumption and environmental pollution are avoided, and it has the effect of anti-wrinkle and anti-crease. Water vapor is used to increase the temperature of the fabric, the fiber swells, and the dye diffuses into the fiber and fixes to the fiber after reacting with chemicals. The whole process greatly improves the dyeing and fixing rate, and improves the energy utilization rate and the utilization rate of dyes.

[0020] 2. By adding fatty alcohol polyoxyethylene ether into the dyeing and finishing liquid, it has good emulsifying and dispersing properties and promotes dyeing, preventing the dyeing and finishing liquid from being contaminated and discolored during dyeing, and helping to protect the color from damage; plant rose essence dye has the characteristics of high color development efficiency and good environmental performance. When sodium salt is added, sodium ions will form an electrolytic layer on the surface of the fiber, neutralizing the negative charge of the knitted fiber and reducing the repulsion between the dye and the fiber, thereby promoting dyeing. Through a reasonable dyeing process, the quality of the dyed material is significantly improved and the performance is further optimized.

[0021] 3. Through the chelating and fixing effect of sodium ethylenediaminetetraacetic acid and the color retention effect of 2,4-dihydroxybenzophenone, the color fastness can be improved without the use of sodium sulfate or urea, reducing the pollution emissions of floating color and dyeing process, improving the stability of dyeing process control, improving energy utilization and dye utilization, and no complicated temperature and humidity control is required, thus achieving greater energy saving and consumption reduction benefits. DETAILED DESCRIPTION

[0022] The present application is further described in detail below with reference to the embodiments.

[0023] raw material Some of the raw materials used in the preparation examples and embodiments: the degreasing agent is hydroxyethylidene diphosphonic acid: purchased from Shandong Longhui Chemical Co., Ltd.; alkyl alcohol ether sodium sulfate item number: Disponil FES 370; plant rose essence dye is purchased from: Shanghai Mengdihu Industrial Co., Ltd.; tetraacetylethylenediamine is purchased from Shandong Liuchuanfeng Environmental Protection Technology Co., Ltd.; the knitted fabric is knitted 32s cotton-mo blend, purchased from Zhangjiagang Baisijia Knitting Textile Co., Ltd.; the sodium salt solution is a mixture of 5% sodium carbonate solution and 10% sodium chloride solution in a ratio of 10:1, wherein the sodium carbonate solution is prepared by dissolving sodium carbonate in water, and the sodium chloride solution is prepared by dissolving sodium chloride in water.

[0024] The raw materials used in the examples and comparative examples that are not otherwise specified are all conventional products that can be purchased from the market. Example

[0025] Example 1 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0026] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 2:1:8, and water is used as the system, and the bath ratio is 1:25.

[0027] (4) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:2, and the water bath ratio is 1:50. The liquid rate of the fabric after being squeezed by the fixing solution padding device is 75%; steaming fixing, temperature 105℃, steaming for 60 minutes; (5) Washing and drying: The spray flow rate is 2.0L / kg. After spray washing, the fabric enters three drying stages: infrared drying, with the moisture content of the fabric at 75%; roller drying, with the moisture content of the fabric at 40%; stenter drying, with the moisture content of the fabric controlled at 8%; and finished product packaging.

[0028] Example 2 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 95°C for 2 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.8 g / L tetraacetylethylenediamine, 1 g / L sodium alkyl alcohol ether sulfate, and 6 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steam box for reaction for 25 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0029] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 40-50%. The temperature in the tenter dryer is 150°C, and the tenter drying is performed for 36 seconds. After drying, the moisture content of the fabric is controlled at 8%. (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 120°C at a rate of 1°C / min, maintain for 1 hour, and then cool it to 50°C at a rate of 8°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 60 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 2:1:8 with water as the system, and the bath ratio is 1:25.

[0030] (4) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:2, and the water bath ratio is 1:50. The liquid rate of the fabric after being squeezed by the fixing solution padding device is 75-95%; steaming fixing, temperature 100℃, steaming for 45 minutes; (5) Washing and drying: The spray flow rate is 2.0L / kg. After spray washing, the fabric enters three drying stages: infrared drying, with the moisture content of the fabric at 75%; roller drying, with the moisture content of the fabric at 40%; stenter drying, with the moisture content of the fabric controlled at 8%; and finished product packaging.

[0031] (5) Washing and drying: The spray flow rate is 3.0L / kg. After spray washing, the fabric enters three drying stages: infrared drying, with the fabric moisture content at 65%; roller drying, with the fabric moisture content at 40%; stenter drying, with the fabric moisture content controlled at 5%; and finished product packaging.

[0032] Example 3 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0033] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 4:1:5, and water is used as the system, and the bath ratio is 1:25.

[0034] (4) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:2, and the water bath ratio is 1:50. The liquid rate of the fabric after being squeezed by the fixing solution padding device is 75%; steaming fixing, temperature 105℃, steaming for 60 minutes; (5) Washing and drying: The spray flow rate is 2.0L / kg. After spray washing, the fabric enters three drying stages: infrared drying, with the moisture content of the fabric at 75%; roller drying, with the moisture content of the fabric at 40%; stenter drying, with the moisture content of the fabric controlled at 8%; and finished product packaging.

[0035] Example 4 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0036] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 2:3:6, and water is used as the system, and the bath ratio is 1:25.

[0037] (4) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:2, and the water bath ratio is 1:50. The liquid rate of the fabric after being squeezed by the fixing solution padding device is 75%; steaming fixing, temperature 105℃, steaming for 60 minutes; (5) Washing and drying: The spray flow rate is 2.0L / kg. After spray washing, the fabric enters three drying stages: infrared drying, with the moisture content of the fabric at 75%; roller drying, with the moisture content of the fabric at 40%; stenter drying, with the moisture content of the fabric controlled at 8%; and finished product packaging.

[0038] Example 5 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0039] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid is: fatty alcohol polyoxyethylene ether and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether and plant rose essence dye is 2:9, water is used as the system, and the bath ratio is 1:25.

[0040] (4) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:2, and the water bath ratio is 1:50. The liquid rate of the fabric after being squeezed by the fixing solution padding device is 75%; steaming fixing, temperature 105℃, steaming for 60 minutes; (5) Washing and drying: spraying at a flow rate of 2.0L / kg, after spray washing, enter three drying stages: infrared drying, with the fabric moisture content at 75%; roller drying, with the fabric moisture content at 40%; tenter drying, with the fabric moisture content controlled at 8%; finished product roll packaging.

[0041] Example 6 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0042] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid is: sodium salt solution and plant rose essence dye, the mass ratio of the sodium salt solution and the plant rose essence dye is 1:10, and the bath ratio is 1:25 with water as the system.

[0043] (4) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:2, and the water bath ratio is 1:50. The liquid rate of the fabric after being squeezed by the fixing solution padding device is 75%; steaming fixing, temperature 105℃, steaming for 60 minutes; (5) Washing and drying: spraying at a flow rate of 2.0L / kg, after spray washing, enter three drying stages: infrared drying, with the fabric moisture content at 75%; roller drying, with the fabric moisture content at 40%; tenter drying, with the fabric moisture content controlled at 8%; finished product roll packaging.

[0044] Example 7 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0045] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 2:1:8, and water is used as the system, and the bath ratio is 1:25.

[0046] (4) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid, with water as the system, the water bath ratio is 1:50, and the cloth liquid rate after extrusion by the fixing solution padding device is 75%; steaming fixing, temperature 105℃, steaming for 60min; (5) Washing and drying: spraying at a flow rate of 2.0L / kg, after spray washing, enter three drying stages: infrared drying, with the fabric moisture content at 75%; roller drying, with the fabric moisture content at 40%; tenter drying, with the fabric moisture content controlled at 8%; finished product roll packaging.

[0047] Example 8 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0048] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 2:1:8, and water is used as the system, and the bath ratio is 1:25.

[0049] (4) Fixing: Padding with fixing liquid, the fixing liquid is 2,4-dihydroxybenzophenone, with water as the system, the water bath ratio is 1:50, and the cloth after being squeezed by the fixing liquid padding device has a liquid content of 75%; steaming fixing, temperature 105°C, steaming for 60 minutes; (5) Washing and drying: spraying at a flow rate of 2.0L / kg, after spray washing, enter three drying stages, infrared drying, the cloth water content is 75%; roller drying, the cloth water content is 40%; tenter drying, the cloth moisture content is controlled at 8%; finished product packaging.

[0050] Comparative Example Comparative Example 1 A method for continuous dyeing and finishing of knitted fabrics, comprising: (1) pre-treatment of the knitted fabric: the fabric is immersed in a degreasing agent to remove oil, then placed in a reaction box to react at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then immersed in a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, and the water bath ratio is 1:15.

[0051] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 2:1:8, and water is used as the system, and the bath ratio is 1:25.

[0052] (4) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:2, and the water bath ratio is 1:50. The liquid rate of the fabric after being squeezed by the fixing solution padding device is 75%; steaming fixing, temperature 105℃, steaming for 60 minutes; (5) Washing and drying: The spray flow rate is 2.0L / kg. After spray washing, the fabric enters three drying stages: infrared drying, with the moisture content of the fabric at 75%; roller drying, with the moisture content of the fabric at 40%; stenter drying, with the moisture content of the fabric controlled at 8%; and finished product packaging.

[0053] Comparative Example 2 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0054] (2) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 2:1:8, and water is used as the system, and the bath ratio is 1:25.

[0055] (3) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:2, and the water bath ratio is 1:50. The liquid rate of the fabric after being squeezed by the fixing solution padding device is 75%; steaming fixing, temperature 105℃, steaming for 60 minutes; (4) Washing and drying: The spray flow rate is 2.0L / kg. After spray washing, the fabric enters three drying stages: infrared drying, with the moisture content of the fabric at 75%; roller drying, with the moisture content of the fabric at 40%; stenter drying, with the moisture content of the fabric controlled at 8%; and finished product packaging.

[0056] Comparative Example 3 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0057] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 2:1:8, and water is used as the system, and the bath ratio is 1:25.

[0058] (4) Washing and drying: The spray flow rate is 2.0L / kg. After spray washing, the fabric enters three drying stages: infrared drying, with the moisture content of the fabric at 75%; roller drying, with the moisture content of the fabric at 40%; stenter drying, with the moisture content of the fabric controlled at 8%; and finished product packaging.

[0059] Comparative Example 4 A method for continuous dyeing and finishing of knitted fabrics in open width, comprising: (1) pre-treatment of the knitted fabric: the fabric is impregnated with a degreasing agent to remove oil, then placed in a reaction box for reaction at 85°C for 4 minutes, and pre-washed with water for 15 minutes; then impregnated with a bleaching agent, wherein the bleaching agent is a mixture of 0.5 g / L tetraacetylethylenediamine, 3 g / L sodium alkyl alcohol ether sulfate, and 3 g / L sodium carbonate, with a water bath ratio of 1:15, and then placed in a steamer for reaction for 20 minutes; then the knitted fabric is placed in an open width state into a squeezing roller, and is subjected to high-efficiency water washing by a pump spray circulation, washed with hot water at 70°C for 15 minutes, and then washed with cold water for 15 minutes and dehydrated.

[0060] (2) Tenter drying heat setting: The moisture content of the bleached fabric after passing through the dryer is 50%; the temperature in the tenter drying machine is 140°C, and the tenter drying is performed for 45 seconds. After drying, the moisture content of the fabric is controlled at 15%; (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100°C at a rate of 3°C / min, maintain it for 3 hours, and then cool it to 60°C at a rate of 5°C / min, drain the residual liquid of the dyeing finishing liquid, and store the cloth for 45 minutes; wherein the dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, the mass ratio of fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye is 2:1:8, and water is used as the system, and the bath ratio is 1:25.

[0061] (4) Fixing: Padding with fixing solution, the fixing solution is sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:2, and the water bath ratio is 1:50. The liquid rate of the fabric after being squeezed by the fixing solution padding device is 75%; steaming fixing, temperature 105℃, steaming for 60 minutes; (5) Washing and drying: spray at a flow rate of 2.0 L / kg, spray washing, and roller drying; the finished product is rolled.

[0062] Performance Testing Examples 1-8 and Comparative Examples 1-4 are based on a knitted fabric open width continuous dyeing and finishing process, and the knitted fabrics obtained by dyeing and finishing are tested for performance using the following method: a. Color fastness: Tested in accordance with ISO 105E04-2008 Textiles - Color fastness to perspiration; b. Breaking strength: Tested according to ISO13934-1-1999 Textile Breaking Strength Test Method; c. Appearance comparison: Dyeing effect, fabric creases, crease ratio is calculated as the percentage of crease area to total area in 10m*10m fabric; performance is shown in Table 1: Table 1 Performance test results The embodiment of the present application is based on a method for continuous dyeing and finishing of knitted fabrics in open width. The dyeing stability of the knitted fabrics obtained by dyeing and finishing is all qualified, with high dyeing and finishing efficiency and good environmental protection performance. In addition, the bleaching and dyeing fixation effects of the fabric are good, the fabric is flat, and there are few creases, which can achieve market development.

[0063] As can be seen from Table 1, compared with Example 1 and Comparative Examples 1-4, the knitted fabric obtained by dyeing and finishing in Example 1 has better performance indicators such as appearance contrast, color fastness and breaking strength than Comparative Examples 1-4, indicating that after the fabric is impregnated and bleached, it is steamed in a knitted fabric steamer to achieve a better bleaching effect, and the water vapor increases the temperature of the fabric, the fiber swells, and the dye diffuses into the fiber and fixes the fiber after reacting with the chemical. After continuous washing, the knitted fabric is flattened by spraying, and then heat-set by tenter drying, so that the knitted fabric has better dye penetration, avoiding adding more penetrants to damage the fibers of the knitted fabric, and the tenter drying has an important anti-wrinkle effect; and then through dyeing, cloth storage and steaming fixation, the breaking strength of the fiber is greatly improved, and the dyeing and fixing effect of the knitted fabric is guaranteed, avoiding high energy consumption and environmental pollution, and playing an anti-wrinkle and anti-crease effect. The whole process greatly improves the dyeing and fixing rate, and improves the energy utilization rate and the utilization rate of the dye.

[0064] Compared with Example 1 and Examples 4-6, it can be seen that the knitted fabric obtained by dyeing and finishing in Example 1 has better performance indicators such as appearance contrast, color fastness and breaking strength than Examples 4-6. The applicant found that within the mass ratio range of the fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye disclosed in the present application, the fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye are mixed for dyeing, so that the penetration and color development effect is good, the long chain of the fatty alcohol polyoxyethylene ether can penetrate into the plant fiber, entangle and fix, so that the activity of the knitted fabric fiber is restricted, the shrinkage resistance of the fabric can be improved, and the breaking strength of the knitted fabric is improved. Too much sodium salt solution will affect the breaking strength of the fabric and reduce the skin-friendly comfort of the fabric.

[0065] Compared with Example 1 and Example 7-8, it can be seen that the knitted fabric obtained by dyeing and finishing in Example 1 has better performance indicators such as appearance contrast, color fastness and breaking strength than Examples 7-8. The applicant found that the ratio range of sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone disclosed in the present application can achieve the effect of improving color fastness through the chelating and fixing effect of sodium salt of ethylenediaminetetraacetic acid and the color retention effect of 2,4-dihydroxybenzophenone, and there is no need to use sodium sulfate or urea, which reduces floating color and pollution emissions in the dyeing process, improves the stability of dyeing process control, and improves energy utilization and dye utilization.

[0066] 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. A knitted fabric open width continuous dyeing and finishing process, characterized in that: The processing steps include: (1) Pretreatment of knitted fabrics: The fabric is immersed in a degreasing agent to remove oil, then placed in a reaction box and reacted at 85-95°C for 2-4 minutes for pre-washing; Then soak in bleaching aid, put into steam box to react for 20-25 minutes; then enter open width water washing; (2) Tenter drying and heat setting: The moisture content of the bleached fabric after passing through the dryer is 40-50%. Tenter drying is carried out in the tenter dryer. After drying, the moisture content of the fabric is controlled at 8-15%. (3) Open-width unwinding dyeing: The knitted fabric dyeing machine after the tentering, drying and heat setting is operated to raise the temperature of the dyeing finishing liquid to 100-120°C at a rate of 1-3°C / min, maintain the temperature for 1-3h, then cool the temperature to 50-60°C at a rate of 5-8°C / min, drain the residual liquid of the dyeing finishing liquid, and store the fabric for 45-60min; (4) Fixing: Padding with fixing liquid, the liquid rate of the fabric after extrusion by the fixing liquid padding device is 75-95%; steam fixing, temperature 100-105℃, steaming for 45-60min; (5) Washing and drying: spray at a flow rate of 2.0-3.0L / kg, after spray washing, enter the third drying process, infrared drying, the water content of the fabric is 75-65%; Roller drying, the moisture content of the fabric is 40-50%; Tenter drying, the moisture content of the fabric is controlled at 5-8%; the finished product is rolled.

2. The open width continuous dyeing and finishing process of knitted fabric according to claim 1, characterized in that: The bleaching aids are 0.5-0.8 g / L of tetraacetylethylenediamine, 0-3 g / L of sodium alkyl alcohol ether sulfate, and 3-6 g / L of sodium carbonate.

3. The open-width continuous dyeing and finishing process for knitted fabric according to claim 1, characterized in that: The open-width washing is to make the knitted fabric enter the squeezing roller in an open-width state, and the pump sprays and circulates the water for efficient washing.

4. The open-width continuous dyeing and finishing process for knitted fabrics according to claim 3, characterized in that: The high-efficiency water washing is hot water washing at 60-70°C for 15-20 minutes, followed by cold water washing for 15-20 minutes and dehydration.

5. The open width continuous dyeing and finishing process of knitted fabric according to claim 1, characterized in that: The dyeing finishing liquid comprises: fatty alcohol polyoxyethylene ether, sodium salt solution and plant rose essence dye, with water as the system and a bath ratio of 1:20-25.

6. The open width continuous dyeing and finishing process of knitted fabric according to claim 5, characterized in that: The mass ratio of the fatty alcohol polyoxyethylene ether, the sodium salt solution and the plant rose essence dye is (2-4):1:(5-8).

7. The open width continuous dyeing and finishing process of knitted fabric according to claim 1, characterized in that: The tentering temperature of the tentering drying is 140-150° C., and the time is 36-45 seconds.

8. The open width continuous dyeing and finishing process of knitted fabric according to claim 1, characterized in that: The color fixing solution comprises sodium salt of ethylenediaminetetraacetic acid and 2,4-dihydroxybenzophenone in a mass ratio of 1:(2-4).

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