Loose fiber purple plant dyeing method

Abstract

The invention provides a loose fiber purple plant dyeing method, which belongs to the field of dyeing and finishing, and comprises the following steps: loading cellulose loose fibers into a cage, and carrying out pretreatment and inverse cylinder cation modification to obtain modified loose fibers; dehydrating the modified loose fibers, then carrying out inverted vat dyeing, then adding a mordant, soaping and drying to obtain purple loose fibers; in the step of vat-reversing dyeing, lithospermum dye liquor containing a leveling agent is adopted, so that the modified fibers which are recaged in a vat are colored. According to the method, the filling uniformity of the loose fibers is improved by mainly adopting a mode of adding inverted jars and reloading into the cage, so that the permeation uniformity of the working solution in each step in the dyeing process is improved, the problem of dyeing defects of the vegetable dye purple cheese loose fibers is solved, the dyeing quality of the loose fibers is improved, the difficulty of color spinning is reduced, and the cost is remarkably saved.

Description

Technical Field

[0001] The invention belongs to the technical field of dyeing and finishing, and particularly relates to a method for dyeing loose fiber purple plants. Background Art

[0002] In the dyeing and finishing industry, plant dyes in my country have been widely used in the design and production of high-end clothing. Their textile products are also popular all over the world and are deeply loved by the public. Plant dyeing, also known as "natural dyeing" and "plant dyeing", is a method of dyeing textile fibers using dyes extracted from herbs. The dyes extracted from plants contain their special pigments, and the fibers are colored through dyeing processes such as mordant dyeing and overdyeing, and the hue components are quite complex. Although there are many types of plant dyes, the color spectrum of dyes is still not comprehensive. Plant dyeing commonly uses red, yellow, blue and other colors, while green, purple and other tones are relatively rare, and some plant dyes cannot dye dark colors on fiber fabrics, especially purple dyes are relatively rare. Therefore, based on this type of situation, a comprehensive dyeing method is generally used to dye dark colors and enrich the hue.

[0003] The comprehensive dyeing techniques of plant dyes are generally four types: overdyeing, re-dyeing, mixed dyeing and multi-mordant dyeing. Among them, the overdyeing process usually involves dyeing one color first and then over-dyeing another color. The re-dyeing method is mainly to dye repeatedly, and each time it is dyed, dried and then dyed again. After repeated multiple times, a dark color can be obtained. Mixed dyeing mainly involves mixing two dyes in a dye bath for dyeing, which is often used in synthetic dye dyeing processes, and it requires that two dyes with the same dyeing speed can be mixed. The dyeing method of multi-mordant dyeing mainly increases the amount of mordant, or mixes multiple mordants for dyeing, which will obtain the intermediate color of each mordant. The pre-mordant dyeing method is involved in the multi-mordant dyeing method, which is a method of first treating the dyeing material with a mordant and then dyeing it with a plant dye. The advantage of this method is that it can control the color concentration in time, making it more convenient to imitate color, and is particularly suitable for dyeing light colors. These mordants can be divided into two categories: iron ion and aluminum ion mordants.

[0004] In traditional Chinese plant dyeing, lithospermum is a typical mordant plant dye for purple colors. Lithospermum contains a variety of chemical components, among which naphthoquinone compounds are the main source of lithospermum pigments. The pigment in fresh lithospermum root is easily soluble in water and can be extracted by beating and adding hot water, but after the lithospermum root is dried, the pigment is no longer soluble in water. Traditional plant dyes are used to color fabrics through tie-dyeing, batik and cross-stitching. However, the disadvantage of this method is that the dyeing process is complicated and takes a long time. In addition, during dyeing, the fabric cannot be spread out completely and evenly, which makes the pre-mordanted fabric easily affected and prone to uneven dyeing. For the dyeing of loose fiber cheese yarn, the caged loose fibers are also difficult to be completely evenly stacked, which makes the pre-mordanted loose fibers easily affected and prone to uneven dyeing. Therefore, ensuring uniform pre-mordant treatment is a prerequisite for ensuring uniform dyeing, but it is not controllable to a certain extent. Among them, the purple-gray dyeing of plant dye loose fibers has always had the problem of color flowers. Summary of the invention

[0005] Aiming at the color fringing problem in the existing package yarn dyeing technology of loose fiber with purple plant dye, the present invention provides a method for purple plant dyeing of loose fiber. The method of the present invention can improve the quality of purple plant dyeing of loose fiber, is simple and easy to operate, and has low cost.

[0006] The present invention provides a method for dyeing a loose fiber purple plant, comprising the following steps:

[0007] After the cellulose loose fibers are caged, they are pre-treated and subjected to cationic modification by inversion to obtain modified loose fibers;

[0008] The modified loose fibers are dehydrated and then dyed in an inverted vat, and then a mordant is added, followed by soap washing and drying to obtain purple loose fibers; the inverted vat dyeing uses lithospermum dye solution containing a leveling agent to color the modified fibers that are re-caged in the inverted vat.

[0009] In the embodiment of the present invention, the cellulose bulk fiber cage is filled with wet cellulose bulk fibers, and the density is controlled to be 0.11-0.15 g / cm 3 , the bath ratio is 1:(15~25), and the outflow pump speed is 40~50%.

[0010] In an embodiment of the present invention, the pretreatment is performed using a working solution containing 0.2-0.4 g / L of penetrant at a temperature of 94-96° C. After circulating for at least 30 minutes, the water is discharged and washed with cold water to obtain pretreated loose fibers.

[0011] In an embodiment of the present invention, the cationic modification of the inverted cylinder includes: dehydrating the pre-treated loose fibers, adding a cationic modifier solution after re-caging the inverted cylinder, performing a modification treatment at a temperature of 75 to 85°C, and washing with cold water to obtain modified loose fibers.

[0012] In an embodiment of the present invention, the inverted vat dyeing includes: re-caging the dehydrated modified loose fiber in an inverted vat, adding comfrey dye solution containing a leveling agent, the bath ratio is 1:(15-25), the outflow pump speed is 40-50%, and the dyeing temperature is 70-90°C.

[0013] In an embodiment of the present invention, after the inverted vat dyeing, a working solution containing a mordant is added at room temperature for medium treatment; the working solution containing a mordant comprises: 2-4 g / L ferrous sulfate and 0.5-1.5 g / L dyeing acid.

[0014] In the embodiment of the present invention, the soap washing is carried out with 1-5 g / L soaping agent solution at a temperature of 50-60° C. for 5-10 min, followed by cold water washing, dehydration and drying to obtain dry purple loose fibers.

[0015] In the embodiment of the present invention, a softener is added after the soap washing for treatment; the softener is 1-5 g / L, the treatment temperature is 40-50° C., and the treatment time is 20-30 min.

[0016] Compared with the existing loose fiber cheese dyeing process, the present invention pre-treats the caged cellulose loose fibers, performs cationic modification by inverting the cylinder, performs inverting dyeing and medium treatment after dehydration, uses lithospermum dye solution containing a leveling agent to color the modified fibers that are re-caged in the inverted cylinder, and finally soaps and dries to obtain purple loose fibers. The process of the present invention is improved on the basis of the existing process, adds the process of inverting the cylinder and re-caging, solves the technical difficulties of dyeing the loose fiber cheese yarn with plant dye purple dye, a special dye, and successfully develops a dyeing process for plant purple dyeing cheese yarn loose fibers. The present invention increases the uniformity of loose fiber filling by adding inverting the cylinder and re-caging, thereby increasing the uniformity of working liquid penetration in each step during the dyeing process, solves the problem of color flower of plant dye purple cheese yarn loose fiber dyeing, improves the quality of loose fiber dyeing, reduces the difficulty of color spinning, and significantly saves costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the process flow of the cheese loose fiber dyeing process in some embodiments of the present application;

[0019] Figure 2This is a photo of the purple bulk fiber sample of Example 1 of the present invention;

[0020] Figure 3 This is a photo of the purple bulk fiber sample of Comparative Example 1 of the present invention;

[0021] Figure 4 The following are photos of dyed fibers of other embodiments. DETAILED DESCRIPTION

[0022] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the technical scheme of the present invention is now described in detail below in conjunction with specific embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0023] The present invention provides a method for dyeing loose fiber purple plants, comprising the following steps:

[0024] After the cellulose loose fibers are caged, they are pre-treated and subjected to cationic modification by inversion to obtain modified loose fibers;

[0025] The modified loose fibers are dehydrated and then dyed in an inverted vat, and then a mordant is added, followed by soap washing and drying to obtain purple loose fibers; the inverted vat dyeing uses lithospermum dye solution containing a leveling agent to color the modified fibers that are re-caged in the inverted vat.

[0026] The plant dyeing method for cheese yarn loose fibers provided by the invention can improve the quality of purple dyeing of the loose fibers, and is simple, easy to implement and low in cost.

[0027] See also Figure 1 In the embodiment of the present invention, the weighed cellulose loose fibers can be moistened and then evenly loaded into cages; then pre-treatment, inversion modification (first loading and cation modification), second inversion (second inversion) for dyeing and medium treatment are carried out in sequence, and then soaping, optional softening, dehydration and drying are carried out to obtain the product.

[0028] Cellulose yarn is usually dyed with reactive dyes. The basic operation process is to wind the cellulose yarn on a bobbin, and then put several bobbins into a dye vat. During the dyeing process, the yarn remains stationary in the dye vat, and the dye liquid is pumped by a pump to circulate between the fibers from the inner layer to the outer layer in the dye vat, so that the dye is evenly dyed and finally dried.

[0029] For dyeing of cellulose bulk fibers, which are looser than yarns, fiber cages are used for dyeing. In the embodiment of the present invention, wetted cellulose bulk fibers (mainly cotton bulk fibers, the length of the bulk fibers is not limited) are caged, and the cage density is preferably controlled to be 0.11-0.15 g / cm 3, cover the lid and prepare for pre-treatment. Among them, the bath ratio can be controlled at 1: (15~25) according to the different fiber weights, and the outflow pump speed is 40~50%. The bath ratio generally refers to the ratio of the weight of the fabric to be treated to the volume of the working liquid, such as 1g: 20L. Density control method: weighing volume method; according to the dye vat model, weigh the bulk fiber weight. For example, the 24kg dye vat model weighs the bulk fiber weight of 24*0.8kg. The empirical coefficient cannot exceed 0.8, otherwise it is easy to color. The worker's experience value is that the 24kg cylinder type generally weighs 8-15kg of cotton. It cannot be pressed below 8kg and it is too crowded above 15kg. After each cage is loaded, measure the diameter and height of the cotton cake to calculate the bulk fiber cake volume and density. The density is controlled at 0.11-0.15g / cm 3 , proceed to the next step after passing the test.

[0030] The embodiment of the present invention mainly increases the wettability of the loose fibers through pretreatment; preferably, a working solution containing 0.2-0.4g / L of penetrant is used for pretreatment, and the temperature is preferably 94-96°C; circulate for at least 30 minutes, drain, and wash with cold water to obtain the pretreated loose fibers. Wherein, the penetrant is a mixture of one or more anionic or non-ionic penetrants; specifically, fatty alcohol polyoxyethylene polyoxypropylene alkyl ether, and the concentration is preferably 0.3g / L. The cold water washing is generally 20-30°C water washing, and can be washed twice, each time for 10 minutes. For example, the working solution containing the penetrant includes: 0.2-0.4g / L of penetrant DT-J01 (Shandong Yellow River Delta Textile Science and Technology Research Institute Co., Ltd.); 0.3-1.5g / L of chelating dispersant LS-720 (Zhejiang Liansheng New Materials Co., Ltd.).

[0031] In order to dye evenly, the embodiment of the present invention dehydrates the pre-treated loose fibers, inverts the cylinder after dehydration and re-cages them, and then adds a cationic modifier solution. The embodiment of the present invention can accurately weigh 4-6% of the cationic modifier, add water and stir evenly to prepare the cationic modifier solution. The cationic modifier can be a weak cationic auxiliary agent, which is mainly used for color fixation and medium effect; cationic modifiers CM1, cationic modifier JL and other modifications make cellulose cationic, which can enable more dye molecules to overcome resistance and diffuse into the fiber. The present invention specifically uses cationic modifier CM1 to modify cellulose to make it cationic, promote anionic plant dyes to dye fibers, and enhance coloring performance.

[0032] In the embodiment of the present invention, the cationic modifier solution can be added at room temperature (20-35°C), and the temperature can be raised to 75-85°C after 20-30 minutes, and the modification treatment can be maintained for 60 minutes, and then washed with cold water to obtain modified loose fibers. The cold water washing is generally 20-30°C water washing, and can be washed twice, each time for 10 minutes.

[0033] After obtaining the modified loose fibers, the embodiment of the present invention performs dehydration and inverted dyeing. In order to further uniformly dye, the modified loose fibers are dehydrated again and uniformly loaded into the cylinder, which is the second inverted cylinder or cage; the density is preferably 0.11-0.15 g / cm 3 . In the embodiment of the present invention, a comfrey dye solution containing a leveling agent is added to the modified loose fiber after dehydration; specifically, the leveling agent can be added at room temperature and circulated for 5 minutes, and then the dye can be added and circulated for 25 minutes, and the heating rate is 1°C / min, the temperature is raised to 80°C, and the temperature is kept for dyeing for 60 minutes. Wherein, according to the different fiber weights, the bath ratio is controlled at 1: (15-25), the outflow pump speed is 40-50%, and 0.3g / l of a chelating dispersant can also be added. The leveling agent is a water-soluble surfactant, which is a fiber-philic leveling agent here; the leveling agent occupies the dyeing seat on the fiber before the dye, and plays a role in inhibiting the absorption of the dye in the initial stage of dyeing. During the heating process, the leveling agent is desorbed and the dye molecules slowly go to the dyeing seat to achieve a uniform dyeing result. It is specifically a sodium salt of a higher alcohol sulfate.

[0034] After dyeing, the embodiment of the present invention can be washed twice with 20-30°C water, each time for 10 minutes; then, the prepared working solution containing mordant is added to the colored loose fiber at room temperature for (post) medium treatment to further fix the color and dye it darker; the working solution containing mordant preferably includes: 2-4g / L ferrous sulfate and 0.5-1.5g / L dyeing acid (generally acetic acid). Preferably, the working solution containing mordant contains 3g / L ferrous sulfate and 1g / L dyeing acid; it is added at room temperature, evenly pumped into the main cylinder for 2-3 minutes, circulated at 35°C for 30 minutes, and then washed with 50°C hot water for 10 minutes---washed with cold water for 10 minutes.

[0035] Next, the embodiment of the present invention can be soaped, softened, dehydrated, and dried to obtain dry purple loose fibers.

[0036] In an embodiment of the present invention, the soaping is carried out using a 1-5 g / L soaping agent solution, at a temperature of 50-60° C., for 5-10 min; 0.3 g / L chelating dispersant may also be added. After the soaping, a softener is also added for treatment; the softener concentration may be 1-5 g / L, further 2.5-5 g / L (e.g. 4.5 g / L), the treatment temperature is preferably 40-50° C., and the time is 20-30 min. In addition, the drying may be 80-105° C. hot air drying.

[0037] The color spots of loose fiber cheese dyeing are mainly related to various aspects such as dyeing method, penetration uniformity, tightness of loose fiber loading in the dyeing vat, flow rate of dyeing vat liquid, and heating rate during dyeing. The method of the embodiment of the present invention mainly adds a one-time inverting and re-caging process to the original cheese dyeing process. The loose fibers to be dyed are inverted twice, and the pre-treated and modified loose fibers can be re-loaded from cage No. 1 to cage No. 2 to ensure uniform penetration and modification of the loose fibers; the cage loading process is operated carefully to ensure uniform bulk density of the loose fibers, avoid liquid directly entering the inner layer of loose fibers through the stacking gaps, causing liquid short-circuiting and non-penetration, and causing color spots after the loose fibers are dyed. The embodiment of the present invention can also achieve the purpose of full penetration and reduce dyeing color spots by adjusting the bulk fiber filling density range.

[0038] In order to better illustrate the present invention, the following examples are further illustrated. In the examples, all the original reagents and materials are commercially available, and the experimental methods without specific experimental conditions are conventional methods and conditions known in the art. During the production process, unless otherwise specified, all outflows are controlled at a pump speed of 40-50%.

[0039] In the following embodiments of the present invention, the plant dyes are all purchased from China Textile Science Research Institute Co., Ltd., and other reagents are all purchased from McLean's official website. The instrument used to test the color fastness of fabrics was developed by Shandong Textile Science Research Institute, model LFY-302; the sun exposure climate test machine was developed by Wenzhou Textile Instrument Factory, model YG(B)611-6. The penetrant DT-J01 comes from Shandong Yellow River Delta Textile Science and Technology Research Institute Co., Ltd.; the dyeing acid refers to acetic acid. The chelating dispersant LS-720 comes from Zhejiang Liansheng New Materials Co., Ltd.; the leveling agent is a sodium salt of a higher alcohol sulfate, and the cationic modifier JL and the leveling agent Sn258 are all purchased from McLean's official website.

[0040] Example 1

[0041] 1. Fiber cage:

[0042] 1. Wet the weighed cotton loose fibers (any specifications) and pack them evenly. The density of the packing should be controlled at 0.13±0.02g / cm 3 , cover the lid and prepare for pre-processing.

[0043] 2. Bath ratio: According to the different fiber weights, it is controlled at 1:20±5, and the outflow pump speed is 40-50%.

[0044] 1. Penetration: Accurately weigh 0.3g / l of penetrant and 0.3g / l of chelating dispersant LS-720, at 95±1℃, circulate for 30min--discharge.

[0045] 2. Wash with cold water: Wash with cold water for 10 minutes*2 times.

[0046] 3. Reverse cylinder:

[0047] The pre-treated loose fibers are dehydrated again, evenly loaded into a cylinder, and then the cationic modifier is added.

[0048] 4. Modification:

[0049] 1. Cationic modifier 5%, chelating dispersant LS-720 0.3g / l, add at room temperature, 35℃*20min, heat up to 80℃ at a heating rate of 1℃ / min and keep warm for 60min.

[0050] 2. Wash with cold water: 10min*2 times.

[0051] 5. Second time pouring the cylinder:

[0052] The modified loose fibers are dehydrated again, evenly loaded into the cylinder and then added to the dye solution.

[0053] 6. Dyeing:

[0054] Dye solution formula: purple-gray plant dye 3%; leveling agent Sn258 3%, chelating dispersant LS-7200.3g / l.

[0055] 1. Bath ratio: controlled at 1:(20±5) according to the fiber weight, outflow pump speed 40-50%;

[0056] 2. Add leveling agent at room temperature and circulate for 5 minutes, then add dye and circulate for 25 minutes, 1℃ / min, raise the temperature to 80℃ and keep it warm for dyeing for 60 minutes;

[0057] 3. Wash with cold water: Wash with cold water for 10 minutes, wash twice.

[0058] 7. Media:

[0059] Ferrous sulfate 3g / l; dyeing acid 1g / l.

[0060] Add at room temperature, circulate for 3 minutes to ensure uniformity, then pump into the main cylinder, circulate 35℃*30min--hot water wash 50℃*10min---cold water wash 10min.

[0061] 8. Soap washing:

[0062] Soap detergent 5g / l, chelating dispersant LS-720 0.3g / l; 60℃*10min---wash with cold water for 10min.

[0063] 9. Softening:

[0064] Softener 4.5g / l; 45℃*25min. The type and amount of softener are determined according to the customer's hand feel requirements and color spinning requirements. The softener is generally a polyethylene wax smooth softener, which is conducive to color spinning.

[0065] 10. Drying:

[0066] The dehydrated dyed fiber cake is hung to the entrance of the dryer, and the fiber is dried with hot air at 100±5℃ to control the moisture content at 8±2%. It is then quality inspected, packaged, labeled, and shipped.

[0067] Notice:

[0068] ①The actual process parameters can be adjusted according to the actual color, style and indicators after washing and drying.

[0069] ② The dyeing prescription and process parameters shall be based on the prescription issued by the laboratory based on the actual proofing.

[0070] ③Dissolve the dye in 80℃ hot water, stir thoroughly for 20 minutes, then filter through a 200-mesh screen and set aside.

[0071] Take samples from the inner, outer and middle layers of the dyeing cage respectively, and check the color samples. The colors inside, middle and outside are consistent. For example, Figure 2 As shown in the actual picture. It meets the needs of color spinning; it does not need to be re-sampled and repaired, and can be directly taken out of the tank to complete the dyeing, and the fiber dyeing is successful at one time.

[0072] Comparative Example

[0073] During the production process, there is no special description of the dyeing vat process parameters, all outflow, pump speed is controlled at 55%, 1. Fiber cage:

[0074] 1. Weigh the loose fibers to be dyed according to the cylinder type as shown in the table below, and evenly pack them into the cage after wetting. The density of the cage should be controlled at 0.13±0.02g / cm 3 , cover the lid and prepare for pre-treatment.

[0075] The weight of loose fibers measured on different types of tanks is shown in Table 1. After filling, measure the height. After hanging into the dye tank, use water to press the inside and outside flow twice until it can no longer be pressed.

[0076] Table 1 Weight of loose fibers weighed by different cylinder types

[0077] Cylinder type Weighing cotton 24kg 8-15kg 54kg 20-35kg 144kg. 90-100kg 325 210-250kg

[0078] 2. Bath ratio: According to the different fiber weights, it is controlled at 1:20±5, and the outflow pump speed is 40-50%.

[0079] 1. Penetration: Accurately weigh 0.3g / l of penetrant DT-J01 and 0.3g / l of chelating dispersant LS-720, at 95±1℃, circulate for 30min--discharge.

[0080] 2. Cold water washing: cold water washing 10min*2 times

[0081] 3. Modification:

[0082] 1. After dehydration, add the modifier (modifier 5%) directly, add the material at room temperature of 35℃ for about 20 minutes, heat up to 80℃ at a heating rate of 1℃ / min, and keep the temperature for modification for 60 minutes.

[0083] 2. Wash with cold water for 10 minutes, twice

[0084] 4. Add dye solution after dehydration.

[0085] 5. Dyeing:

[0086] Dye solution prescription: purple-gray plant dye 3%; leveling agent 3%, chelating dispersant LS-720 0.3g / l.

[0087] 1. Bath ratio: According to the different fiber weight, it is controlled at 1:(20±5), and the outflow pump speed is 40-50%.

[0088] 2. Add 3% leveling agent working solution at room temperature of 35℃ and circulate for 5 minutes, then add dye solution and circulate for 25 minutes, raise the temperature to 80℃ at 1℃ / min and keep it warm for 60 minutes.

[0089] 3. Wash with cold water: Wash in cold water for 10 minutes, twice.

[0090] 6. Media:

[0091] Ferrous sulfate 3g / l; dyeing acid 1g / l.

[0092] Add at room temperature and circulate for 3 minutes to ensure uniform chemical reaction. Then the working fluid is pumped into the main cylinder and circulated at room temperature of 35℃*30min--hot water wash at 50℃*10min---cold water wash for 10min.

[0093] 7. Soap washing:

[0094] Soap detergent 5g / l; 60℃*10min---wash with cold water for 10min.

[0095] 8. Softening:

[0096] Softener 2.5——5g / l; 45℃*25min.

[0097] 9. Drying:

[0098] The dehydrated dyed fiber cake is hung to the entrance of the dryer, dried with hot air at 100±5℃, and then quality inspected.

[0099] Take samples from the inner, outer and middle layers of the dyeing cage for comparison. If the colors inside, middle and outside are inconsistent, grade the samples 1 to 2. Figure 3 As shown; it does not meet the color spinning requirements and needs to be re-sampled and repaired.

[0100] In addition, dyeing was performed according to the method of Example 1, except that 10 kg of the weighed loose fibers were moistened and evenly packed in a 24 kg dyeing vat, and the density test was 0.133 g / cm 3 The dyed fiber samples are as follows: Figure 4 As shown, slight color fringing is visible.

[0101] The embodiment of the present invention saves the cost of repairs; the actual cost of repairs (excluding labor costs and time loss) is calculated as follows: the water, electricity and steam energy consumption required for each repair is 2,360 yuan, which generates a large amount of low-quality costs. At the same time, repairs also delay time, delay delivery, waste labor, and cause delays in other orders.

[0102] Water fee: The water consumption is based on 7 processes, 10 tanks of water, and 4.5 hours of operation. The water fee is calculated at 22 yuan / t. 6400L of water is added each time. The total water consumption = 6400*10 = 64 tons. The unit price of water is 22 yuan / ton, and the total water cost is 64*22 = 1408 yuan.

[0103] Steam: The total heating process requires 6500 liters of water to be heated from 30°C to 95°C, 80°C, 50°C, etc. Raising the temperature of 1L of water by 10 degrees consumes 0.014 kg of steam. The entire process requires a total water temperature difference of 210°C. The amount of steam consumed = 6400*210*0.014 = 1881.6 kg. The unit price of steam is 200 yuan / ton, and the total cost is 1.8816×200 = 373.32 yuan.

[0104] The cost of dye varies according to the type of color and color depth.

[0105] Electricity cost: The power of the cooking tank equipment is 128.75kw, the processing time is close to 270min, equivalent to 4.5h, the electricity cost is 1 yuan / kWh, and the total cost is: 128.75×4.5×1=579.375 yuan.

[0106] The above water, electricity and energy consumption costs total: 2,360.695 yuan.

[0107] It can be seen from the above embodiments that the embodiments of the present invention adopt the method of adding inverted cylinders and reloading cages to increase the uniformity of bulk fiber filling, thereby increasing the uniformity of working liquid penetration in each step of the dyeing process, solving the problem of color spots in the dyeing of purple cheese yarn bulk fibers with plant dyes, improving the quality of bulk fiber dyeing, reducing the difficulty of color spinning, significantly saving costs, and having unpredictable advantages.

[0108] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A method for dyeing loose fiber purple plants, characterized in that: The following steps are involved: After the cellulose loose fibers are caged, they are pre-treated and subjected to cationic modification by inversion to obtain modified loose fibers; The modified loose fibers are dehydrated and then dyed in an inverted vat, and then a mordant is added, followed by soap washing and drying to obtain purple loose fibers; the inverted vat dyeing uses lithospermum dye solution containing a leveling agent to color the modified fibers that are re-caged in the inverted vat.

2. The method for purple plant dyeing of loose fibers according to claim 1, wherein: The cellulose bulk fiber cage is filled with wet cellulose bulk fibers, and the density is controlled to be 0.11-0.15 g / cm 3 , the bath ratio is 1:(15~25), and the outflow pump speed is 40~50%.

3. The method for bulk fiber purple plant dyeing according to claim 2, characterized in that, The pretreatment is carried out using a working solution containing 0.2-0.4 g / L of a penetrant at a temperature of 94-96° C. After circulating for at least 30 minutes, the water is discharged and washed with cold water to obtain pretreated loose fibers.

4. The method for purple plant dyeing of loose fibers according to claim 3, characterized in that: The cationic modification by inverting the cylinder comprises: dehydrating the pre-treated loose fibers, re-caging the inverted cylinder, adding a cationic modifier solution, performing a modification treatment at a temperature of 75 to 85° C., and washing with cold water to obtain modified loose fibers.

5. The method for purple plant dyeing of loose fibers according to claim 4, characterized in that: The inverted vat dyeing comprises: re-caging the dehydrated modified loose fiber in an inverted vat, adding lithospermum dye solution containing a leveling agent, with a bath ratio of 1:(15-25), an outflow pump speed of 40-50%, and a dyeing temperature of 70-90°C.

6. The method for purple plant dyeing of loose fibers according to claim 5, characterized in that: After the inverted dyeing, a working solution containing a mordant is added at room temperature for medium treatment; the working solution containing a mordant comprises: 2-4 g / L ferrous sulfate and 0.5-1.5 g / L dyeing acid.

7. The method for purple plant dyeing of loose fibers according to claim 6, characterized in that: The soap washing is carried out with 1-5 g / L soaping agent solution at a temperature of 50-60° C. for 5-10 minutes, followed by cold water washing, dehydration and drying to obtain dry purple loose fibers.

8. The method for purple plant dyeing of loose fibers according to any one of claims 1 to 7, characterized in that: After the soap washing, a softener is added for treatment; the softener is 1-5 g / L, the treatment temperature is 40-50° C., and the treatment time is 20-30 min.

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