A process for the yarn-dyeing of polyamide yarns

Abstract

This invention discloses a nylon package yarn section dyeing process, comprising: first unloading of the package; first loading of the yarn: mounting the package yarn upright on the yarn rack; pretreatment: washing the package yarn twice with 1%-4% desizing agent at temperatures of 100℃*30 and 60℃*10 respectively; first dyeing: using a two-bath method, dyeing temperature of 100℃*30, the dye bath containing 0.5%-2% leveling agent, 0-1g / l glacial acetic acid, 0.5g / l-1.5g / l sodium acetate, and acidic... The dye concentration is 0-3%, and the dye liquor is sprayed from the upper end of the bobbin at this point; first dehydration; second loosening of the bobbin; second yarn loading: the yarn bobbin is installed in reverse on the yarn rack; second dyeing: a two-bath method is used, the dyeing temperature is 100℃*30, the dye liquor contains 0.5%-2% leveling agent, 0-1g / l glacial acetic acid, 0.5g / l-1.5g / l sodium acetate, and 0-3% acid dye, and the dye liquor is sprayed from the upper end of the bobbin at this point; second dehydration; bobbin tightening. This invention has the advantages of being able to dye bobbin sections in multiple colors, with high dyeing rate, good reproducibility, good color fastness, stable effect, and simple and easy-to-control operation.

Description

Technical Field

[0001] This application relates to the field of yarn dyeing, specifically to a nylon yarn section dyeing process. Background Technology

[0002] With rapid social development and a significant improvement in people's living standards, people's pursuit of clothing colors is becoming increasingly diversified. Color is an essential element of fashion textiles, serving as both the soul of textile patterns and styles, and symbolizing the regional culture and humanistic characteristics of textiles.

[0003] Existing yarn bobbin production methods, combined with traditional nylon dyeing processes, can only dye one color, resulting in a single solid color on the bobbin and preventing the creation of a regular color pattern. Therefore, the fabric patterns and colors currently available on the market can only be created by combining yarn bobbins of different colors. Fabrics woven according to the designed pattern and arrangement of colored yarns are neat and regular because each yarn has only one color from beginning to end. Even if different patterns and color styles are woven using warp and weft yarns of different colors, the fabric style remains monotonous and lacks color variety due to the neat and regular arrangement of the patterns. Summary of the Invention

[0004] Therefore, there is a need to provide a nylon yarn section dyeing process to solve the problem that existing technologies cannot perform section dyeing on yarn and lack the technology to achieve section dyeing.

[0005] To achieve the above objectives, the inventors provide a nylon yarn section dyeing process, comprising:

[0006] First loosening of the tube;

[0007] First yarn loading: Install the yarn cones onto the yarn rack with the yarn facing forward;

[0008] Pretreatment: Wash the yarn packages twice with 1%-4% desizing agent at temperatures of 100℃*30 and 60℃*10 respectively;

[0009] First dyeing: The two-bath method is used, the dyeing temperature is 100℃*30, and the dyeing solution contains 0.5%-2% leveling agent, 0-1g / l glacial acetic acid, 0.5g / l-1.5g / l sodium acetate, and 0-3% acid dye. The dyeing solution is sprayed out from the upper end of the tube at this time.

[0010] First dehydration;

[0011] Second loosening of the cylinder;

[0012] Second yarn loading: Install the yarn cones in reverse on the yarn frame;

[0013] Second dyeing: The two-bath method is adopted, the dyeing temperature is 100℃*30, and the dyeing solution contains 0.5%-2% leveling agent, 0-1g / l glacial acetic acid, 0.5g / l-1.5g / l sodium acetate, and 0-3% acid dye. The dyeing solution is sprayed out at the upper end of the tube at this time.

[0014] Second dehydration;

[0015] Tightening cylinder.

[0016] In some embodiments, between the steps of "first unloading the bobbin" and "first loading the yarn", the following is also included:

[0017] First beveling: beveling the shoulder of the yarn into an arc shape.

[0018] In some embodiments, between the steps of "second loosening of the bobbin" and "second loading of yarn", the following is also included:

[0019] Second beveling: beveling the shoulder of the yarn into an arc shape.

[0020] In some embodiments, the bobbin of the yarn package is a variegated bobbin, which includes an outer bobbin and an inner bobbin. The sidewall of the outer bobbin is provided with an upper spray hole group and a lower spray hole group, and both the upper spray hole group and the lower spray hole group are provided with a plurality of spray holes. The upper spray hole group is located above the outer bobbin, and the lower spray hole group is located below the outer bobbin, and the upper spray hole group and the lower spray hole group are staggered along the circumference of the outer bobbin. The inner bobbin is removably fitted inside the outer bobbin, and the sidewall of the inner bobbin is provided with an upper spray port and a lower spray port. The upper spray port and the lower spray port are respectively located above and below the inner bobbin. When the upper spray port coincides with the upper spray hole group, the lower spray port is staggered with the lower spray hole group, and when the lower spray port coincides with the lower spray hole group, the upper spray port is staggered with the upper spray hole group.

[0021] In the "first dyeing" step, the dye solution is sprayed from the upper spray hole group of the sectional dyeing tube, and in the "second dyeing" step, the dye solution is sprayed from the lower spray hole group of the sectional dyeing tube.

[0022] In some embodiments, the upper spray hole group is located on the front side of the outer tube, the lower spray hole group is located on the back side of the outer tube, and the upper spray port and the lower spray port are located on the same side of the inner tube.

[0023] In some embodiments, a positioning structure is provided between the inner tube and the outer tube, the positioning structure being used to limit the angle when the inner tube is fitted inside the outer tube.

[0024] In some embodiments, the positioning structure includes a positioning protrusion on the outer side wall of the inner tube and a positioning groove on the inner side wall of the outer tube. When the positioning protrusion is inserted into the positioning groove, the upper spray nozzle coincides with the upper spray hole group or the lower spray nozzle coincides with the lower spray hole group.

[0025] In some embodiments, both the upper spray hole group and the lower spray hole group are provided with two to five spray holes.

[0026] In some embodiments, the spray holes of the upper spray hole group are arranged in a regular T-shape, and the spray holes of the lower spray hole group are arranged in an inverted T-shape.

[0027] In some embodiments, the inner tube is made of plastic.

[0028] Unlike existing technologies, the nylon yarn section dyeing process described in the above technical solution uses a two-bath dyeing method. Before the second dyeing, the direction of the yarn is reversed, and the spray positions for both dyeing processes are limited to a localized area at the upper end of the yarn to achieve the section dyeing effect. Combined with mature loosening processes for each type of yarn, dyeing is completed entirely within the dyeing vat. The entire process is simple to operate, easy to control, has a high color uptake rate, excellent dyeing reproducibility, and stable results. It can dye two or more different colors on nylon yarn, producing section-dyed fabric products that are novel and unique. Careful combination of different colors can create fabrics with rich yet harmonious colors and a trendy style. This solves the problem that traditional nylon yarn can only be dyed in a single color in the dyeing vat, overcoming the technical bottleneck of the yarn dyeing industry that relies on solid colors.

[0029] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0030] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0031] In the accompanying drawings of the instruction manual:

[0032] Figure 1 A flowchart illustrating the nylon yarn section dyeing process described in the specific implementation method;

[0033] Figure 2 This is a front view of the dyeing tube described in the specific embodiment;

[0034] Figure 3This is a rear view of the dyeing tube described in the specific embodiment;

[0035] Figure 4 This is a cross-sectional view of the outer tube described in the specific embodiment;

[0036] Figure 5 This is a cross-sectional view of the inner tube described in the specific embodiment;

[0037] Figure 6 This is an end view of the outer tube as described in the specific embodiment;

[0038] Figure 7 This is an end view of the inner tube described in the specific embodiment;

[0039] The reference numerals used in the above figures are explained as follows:

[0040] 1. Outer bobbin;

[0041] 100. Upper spray nozzle assembly;

[0042] 101. Lower spray nozzle assembly;

[0043] 102. Spray nozzle;

[0044] 103. Positioning groove;

[0045] 2. Inner tube;

[0046] 200. Upper spray nozzle;

[0047] 201. Lower spray nozzle;

[0048] 202. Positioning protrusion;

[0049] 203. Grip section. Detailed Implementation

[0050] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0051] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0052] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0053] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0054] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0055] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0056] As understood in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0057] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0058] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0059] With rapid social development and a significant improvement in people's living standards, people's pursuit of clothing colors is becoming increasingly diversified. Color is an essential element of fashion textiles, serving as both the soul of textile patterns and styles, and symbolizing the regional culture and humanistic characteristics of textiles.

[0060] Existing yarn bobbin production methods, combined with traditional nylon dyeing processes, can only dye one color, resulting in a single solid color on the bobbin and preventing the creation of a regular color pattern. Therefore, the fabric patterns and colors currently available on the market can only be created by combining yarn bobbins of different colors. Fabrics woven according to the designed pattern and arrangement of colored yarns are neat and regular because each yarn has only one color from beginning to end. Even if different patterns and color styles are woven using warp and weft yarns of different colors, the fabric style remains monotonous and lacks color variety due to the neat and regular arrangement of the patterns.

[0061] This invention provides a nylon yarn section dyeing process for achieving section dyeing of yarn packages. It can dye two or more different colors on nylon yarn, thereby solving the problem that traditional nylon yarn can only be dyed in a single color in the dyeing vat and overcoming the technical bottleneck in the yarn dyeing industry for solid color samples.

[0062] Please see Figure 1 In a specific embodiment, the nylon yarn section dyeing process includes:

[0063] S101 First loosening of the can;

[0064] S102 First yarn loading: Install the yarn cones onto the yarn rack with the yarn facing forward;

[0065] S103 Pretreatment: Clean the yarn packages twice with 1%-4% desizing agent at temperatures of 100℃*30 and 60℃*10 respectively.

[0066] S104 First dyeing: Two-bath method is used, the dyeing temperature is 100℃*30, the dyeing solution contains 0.5%-2% leveling agent, 0-1g / l glacial acetic acid, 0.5g / l-1.5g / l sodium acetate, and 0-3% acid dye. The dyeing solution is sprayed out at the upper end of the tube at this time.

[0067] S105 undergoes its first dehydration;

[0068] S106 Second Loosening of the Cylinder;

[0069] S107 Second yarn loading: Install the yarn cones in reverse on the yarn frame;

[0070] S108 Second Dyeing: The two-bath method is adopted, the dyeing temperature is 100℃*30, the dyeing solution contains 0.5%-2% leveling agent, 0-1g / l glacial acetic acid, 0.5g / l-1.5g / l sodium acetate, and 0-3% acid dye. The dyeing solution is sprayed out at the upper end of the tube at this time.

[0071] S109 undergoes second dehydration;

[0072] S110 tightening cylinder.

[0073] Because the nylon yarn section dyeing process uses a two-bath dyeing method, and the direction of the yarn is reversed before the second dyeing, and the spray positions of the two dyeing processes are limited to a local area at the upper end of the yarn, the section dyeing effect is achieved. Combined with mature loosening processes for each type of yarn, the dyeing is completed entirely in the dyeing vat. The entire process is simple to operate, easy to control, has a high color uptake rate, excellent dyeing reproducibility, and stable results. It can dye two or more different colors on nylon yarn, producing section-dyed yarn fabrics that are novel and unique. Careful combination of different colors can make the fabric rich in color without being chaotic, with a trendy style. This solves the problem that traditional nylon yarn can only be dyed in a single color in the dyeing vat, overcoming the technical bottleneck of the yarn dyeing industry that relies on solid colors.

[0074] In step S102, the yarn loading step involves loading a predetermined weight of yarn onto the selected yarn rack, and then covering it with a cable cap.

[0075] In step S110, the specific tightening process depends on the intended use of the yarn. It is also necessary to determine whether other processes such as oiling or adding antistatic agents are required, and to control the splicing and formability of each yarn.

[0076] Following step S110 (tightening the cylinder), the following step is also included:

[0077] Packaging: Each yarn grain is packed in a bag and then stored in the warehouse.

[0078] Step S103 Pretreatment: Clean the yarn cones twice with 1%-4% desizing agent at temperatures of 100℃*30 and 60℃*10 respectively. This is used to remove oil and other substances from the yarn surface, which helps reduce dyeing abnormalities.

[0079] To prevent dye leakage from the shoulders of the yarn packages, in some embodiments, the process between the steps of "first loosening of the package" and "first loading of yarn" also includes:

[0080] First beveling: beveling the shoulder of the yarn into an arc shape.

[0081] This ensures that the dye reaches the shoulder of the dyeing drum during the staged dyeing process, thus guaranteeing product quality.

[0082] To prevent changes in the bobbin shoulder after the second bobbin loosening step, some embodiments include the following step between "second bobbin loosening" and "second yarn loading":

[0083] Second beveling: beveling the shoulder of the yarn into an arc shape.

[0084] This ensures that the shoulder of the yarn remains curved after the second loosening step, guaranteeing that the shoulder will be dyed during the space dyeing process and ensuring product quality.

[0085] In some embodiments, the bobbin of the yarn package is a sectional dyeing bobbin, which is used to wind the yarn to load the yarn onto the yarn rack for dyeing. It has the effect of controlling the flow rate and direction of the dye liquor and can be used in conjunction with the nylon yarn sectional dyeing process to dye the yarn in multiple colors, thereby solving the problem that traditional yarn dyeing processes can only dye solid colors.

[0086] The dyeing tube includes an outer tube and an inner tube. The side wall of the outer tube is provided with an upper spray hole group and a lower spray hole group, and each of the upper and lower spray hole groups is provided with a plurality of spray holes. The upper spray hole group is located above the outer tube, and the lower spray hole group is located below the outer tube, and the upper and lower spray hole groups are staggered along the circumference of the outer tube. The inner tube is removably fitted inside the outer tube, and the side wall of the inner tube is provided with an upper spray port and a lower spray port. The upper spray port and the lower spray port are respectively located above and below the inner tube. When the upper spray port coincides with the upper spray hole group, the lower spray port is staggered with the lower spray hole group, and when the lower spray port coincides with the lower spray hole group, the upper spray port is staggered with the upper spray hole group.

[0087] Meanwhile, in the "first dyeing" step, the dye solution is sprayed from the upper spray hole group of the segmented dye tube. At this time, the upper spray hole group of the segmented dye tube is at the top and is in the open state, while the lower spray hole group is in the closed state. In the "second dyeing" step, the dye solution is sprayed from the lower spray hole group of the segmented dye tube. At this time, the lower spray hole group of the segmented dye tube is at the top and is in the open state, while the upper spray hole group is in the closed state.

[0088] If the aforementioned section dyeing tube is used, then:

[0089] In step S101, the outer and inner tubes of the sectional dyeing yarn can be assembled so that the upper spray nozzle of the inner tube coincides with the upper spray hole group of the outer tube, so that the lower spray hole group of the outer tube is in a closed state, and the sectional dyeing yarn is sprayed with liquid from the upper end. The sectional dyeing yarn in this state is placed into the loosening machine for loosening.

[0090] In step S106, the outer and inner tubes of the sectional dyeing yarn can be assembled so that the lower spray nozzle of the inner tube coincides with the lower spray hole group of the outer tube, so that the upper spray hole group of the outer tube is in a closed state, so that the sectional dyeing yarn still relies on the upper spray after being installed in reverse. The sectional dyeing yarn in this state is placed into the loosening machine for loosening.

[0091] In both step S102 (first yarn loading) and step S107 (second yarn loading), a predetermined weight of yarn is loaded and placed on the selected yarn rack. The direction of each section dyeing tube is checked to be consistent. After loading, the cable cap is closed.

[0092] In a specific embodiment, the outer tube 1 is used for winding the yarn, and the inner tube 2 is used for restricting the flow rate and direction of the dye liquor. Please refer to [link / reference]. Figure 2 , Figure 3 and Figure 4 The outer tube 1 has an upper spray hole group 100 and a lower spray hole group 101 on its side wall, and both the upper spray hole group 100 and the lower spray hole group 101 have a plurality of spray holes 102; the upper spray hole group 100 is located above the outer tube 1, and the lower spray holes are located below the outer tube 1, and the upper spray hole group 100 and the lower spray hole group 101 are staggered along the circumference of the outer tube 1; please refer to Figure 5 The inner tube 2 is removably fitted inside the outer tube 1, and the side wall of the inner tube 2 is provided with an upper spray port 200 and a lower spray port 201; the upper spray port 200 and the lower spray port 201 are respectively located above and below the inner tube.

[0093] The upper spray nozzle 200 is used to allow the dye liquid to flow through the upper spray hole group 100 to the outside of the outer tube 1. At the same time, the lower spray hole group 101 needs to be sealed by the side wall of the inner tube 2. The lower spray nozzle 201 is used to allow the dye liquid to flow through the lower spray hole group 101 to the outside of the outer tube 1. Similarly, at the same time, the upper spray hole group 100 needs to be sealed by the side wall of the inner tube 2. That is, with this arrangement of the inner tube 2, the upper spray hole group 100 and the lower spray hole group 101 are not connected at the same time.

[0094] Since the upper spray hole group 100 is located above the outer cylinder tube 1, and the lower spray hole is located below the outer cylinder tube 1, and the upper spray hole group 100 and the lower spray hole group 101 are staggered along the circumference of the outer cylinder tube 1, and the upper spray port 200 and the lower spray port 201 are respectively located above and below the inner cylinder tube, when the upper spray port 200 coincides with the upper spray hole group 100, the lower spray port 201 is staggered with the lower spray hole group 101, and when the lower spray port 201 coincides with the lower spray hole group 101, the upper spray port 200 is staggered with the upper spray hole group 101. Therefore, this achieves the following: there is flow passing through the upper part of the dyeing cylinder tube, and the spray holes below the dyeing cylinder tube... The group is in a closed state; similarly, the group of spray holes above the section dyeing tube is in a closed state, and the group of spray holes below the section dyeing tube has flow. This allows the flow direction of different dye liquors after passing through the outer tube 1 to be adjusted according to actual needs, so that the yarn can be dyed in multiple colors to achieve the effect of section dyeing. In addition, since the entire side wall of the outer tube 1 is not covered with spray holes, but only a few spray holes are set in specific areas, the purpose of adjusting the spray flow rate is achieved. During the flow of the dye liquor, the color of the yarn has a gradient effect, which provides a basis for dyeing multiple colors. Moreover, the actual operation process is simple, easy to control, and can be reused, effectively controlling costs.

[0095] Therefore, the segmented dyeing tube can control the flow rate and direction of the dye liquor, and can be used to dye multiple colors from a single segmented dyeing tube, thus solving the industry bottleneck that traditional yarn dyeing processes can only dye one color (plain color) and cannot dye multiple colors at the same time.

[0096] To ensure the dye liquor evenly covers the yarn circumferentially in the dyeing bobbin, please refer to [link to instructions]. Figure 4 In some embodiments, the upper spray hole group 100 is located on the front side of the outer tube 1, and the lower spray hole group 101 is located on the back side of the outer tube 1. This arrangement allows the dye liquor to evenly cover the yarn wound on the front side of the outer tube 1 and the yarn wound on the back side of the outer tube 1, so that the dye liquor evenly covers the yarn in the circumference of the dyeing tube. In addition, this arrangement allows the dye liquor coverage to be predictable, enabling the reproduction of yarn color matching, which is reproducible, meets the requirements of mass production, and ensures stable quality.

[0097] Since the inner tube 2 is used to adjust the spray direction of the dye liquor, the settings of the upper spray port 200 and the lower spray port 201 must also correspond to the settings of the upper spray hole group 100 and the lower spray hole group 101. Please refer to [link / reference needed]. Figure 5 If the upper spray nozzle 200 and the lower spray nozzle 201 are located on the same side of the inner tube, it will ensure that when the upper spray nozzle 200 coincides with the upper spray hole group 100, the lower spray nozzle 201 is misaligned with the lower spray hole group 101, and when the lower spray nozzle 201 coincides with the lower spray hole group 101, the upper spray nozzle 200 is misaligned with the upper spray hole group 101.

[0098] In order to accurately and quickly assemble the outer tube 1 and the inner tube 2, and to ensure that the inner tube 2 does not rotate arbitrarily after assembly, in some embodiments, a positioning structure is provided between the inner tube 2 and the outer tube 1. The positioning structure is used to limit the angle when the inner tube 2 is fitted into the outer tube 1. When the inner tube 2 is fitted into the outer tube 1 and the inner tube 2 is constrained by the positioning structure, the upper spray nozzle 200 coincides with the upper spray hole group 100 and the lower spray nozzle 201 is misaligned with the lower spray hole group 101, or the lower spray nozzle 201 coincides with the lower spray hole group 101 and the upper spray nozzle 200 is misaligned with the upper spray hole group 101.

[0099] Please see Figure 6 and Figure 7 In some embodiments, the positioning structure includes a positioning protrusion 202 on the outer side wall of the inner tube 2 and a positioning groove 103 on the inner side wall of the outer tube 1. When the positioning protrusion 202 is inserted into the positioning groove 103, the upper spray nozzle 200 coincides with the upper spray hole group 100 or the lower spray nozzle 201 coincides with the lower spray hole group 101. Alternatively, the positioning structure may include a positioning groove on the outer side wall of the inner tube 2 and a positioning protrusion on the inner side wall of the outer tube 1. When the positioning protrusion is inserted into the positioning groove, the upper spray nozzle 200 coincides with the upper spray hole group 100 or the lower spray nozzle 201 coincides with the lower spray hole group 101.

[0100] In some embodiments, four positioning protrusions are provided, and they are arranged in a cross shape, facing each other in pairs; four positioning grooves are provided, and they are arranged in a cross shape, facing each other in pairs.

[0101] In some embodiments, both the upper spray hole group 100 and the lower spray hole group 101 are provided with two to five spray holes.

[0102] In some embodiments, both the upper spray hole group 100 and the lower spray hole group 101 are provided with four spray holes 102. This number of spray holes 102 can achieve the best dyeing effect.

[0103] In some embodiments, the spray holes of the upper spray hole group 100 are arranged in a regular T-shape, and the spray holes of the lower spray hole group 101 are arranged in an inverted T-shape. If the upper spray hole group 100 has four spray holes 102, three of the four spray holes 102 are arranged sequentially along the circumference of the outer tube 1, and the fourth spray hole 102 is located below the central spray hole 102 of the three spray holes 102; if the lower spray hole group 101 has four spray holes 102, three of the four spray holes 102 are arranged sequentially along the circumference of the outer tube 1, and the fourth spray hole 102 is located above the central spray hole 102 of the three spray holes 102.

[0104] To improve the sealing between the inner tube 2 and the outer tube 1, preventing dye from flowing between them, and to ensure the inner tube 2 can be easily pulled out from the outer tube 1, in some embodiments, the inner tube 2 is made of plastic. Plastic is a heat-sensitive material that expands when heated and contracts when cooled, exhibiting thermal expansion and contraction characteristics. During the dyeing process, the temperature rises, causing the inner tube 2 to expand and come into close contact with the outer tube 1, thus preventing dye from flowing between them. After dyeing, the temperature drops, allowing the inner tube 2 to shrink and be easily pulled out from the outer tube 1, adjusting the direction of dye flow for the next dyeing cycle.

[0105] For easier insertion and removal of inner tube 2, please refer to [link / reference]. Figure 5 In some embodiments, the end of the inner tube 2 extends outward to the outside of the outer tube 1 to form a gripping portion 203.

[0106] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A nylon yarn section dyeing process, characterized in that, include: First loosening of the tube; First yarn loading: Install the yarn cones onto the yarn rack with the yarn facing forward; Pretreatment: Wash the yarn packages twice with 1%-4% desizing agent at temperatures of 100℃*30 and 60℃*10 respectively; First dyeing: Two-bath method is used, the dyeing temperature is 100℃*30, the dyeing solution contains 0.5%-2% leveling agent, 0-1g / l glacial acetic acid, 0.5g / l-1.5g / l sodium acetate, and 0-3% acid dye. The amount of acid dye is not zero. The dyeing solution is sprayed out at the upper end of the tube at this time. First dehydration; Second loosening of the cylinder; Second yarn loading: Install the yarn cones in reverse on the yarn frame; Second dyeing: The two-bath method is adopted, the dyeing temperature is 100℃*30, the dyeing solution contains 0.5%-2% leveling agent, 0-1g / l glacial acetic acid, 0.5g / l-1.5g / l sodium acetate, and 0-3% acid dye. The amount of acid dye is not zero. The dyeing solution is sprayed out at the upper end of the tube at this time. Second dehydration; Tightening cylinder; The yarn bobbin is a space-dyed bobbin, which includes an outer bobbin and an inner bobbin. The outer bobbin has an upper spray hole group and a lower spray hole group on its side wall, each group having several spray holes. The upper spray hole group is located above the outer bobbin, and the lower spray hole group is located below it, with the two groups staggered along the circumference of the outer bobbin. The inner bobbin is removably fitted inside the outer bobbin, and its side wall has an upper spray port and a lower spray port. The liquid inlet and the lower spray inlet are respectively located above and below the inner tube. When the upper spray inlet coincides with the upper spray hole group, the lower spray inlet is misaligned with the lower spray hole group. When the lower spray inlet coincides with the lower spray hole group, the upper spray inlet is misaligned with the upper spray hole group. The inner tube is made of plastic, which is a heat-sensitive material. In the "first dyeing" step, the dye liquid is sprayed from the upper spray hole group of the sectional dyeing tube, and in the "second dyeing" step, the dye liquid is sprayed from the lower spray hole group of the sectional dyeing tube.

2. The nylon yarn section dyeing process according to claim 1, characterized in that, Between the steps "first unwinding of the bobbin" and "first loading of yarn", the following is also included: First beveling: beveling the shoulder of the yarn into an arc shape.

3. The nylon yarn section dyeing process according to claim 1, characterized in that, Between the steps "second loosening of the bobbin" and "second loading of yarn", the following is also included: Second beveling: beveling the shoulder of the yarn into an arc shape.

4. The nylon yarn section dyeing process according to claim 1, characterized in that, The upper spray hole group is located on the front of the outer cylinder, the lower spray hole group is located on the back of the outer cylinder, and the upper spray port and the lower spray port are located on the same side of the inner cylinder.

5. The nylon yarn section dyeing process according to claim 1, characterized in that, A positioning structure is provided between the inner tube and the outer tube, which is used to limit the angle when the inner tube is fitted inside the outer tube.

6. The nylon yarn section dyeing process according to claim 5, characterized in that, The positioning structure includes a positioning protrusion on the outer side wall of the inner tube and a positioning groove on the inner side wall of the outer tube. When the positioning protrusion is inserted into the positioning groove, the upper spray nozzle coincides with the upper spray hole group or the lower spray nozzle coincides with the lower spray hole group.

7. The nylon yarn section dyeing process according to claim 1, characterized in that, Both the upper and lower spray hole groups are provided with two to five spray holes.

8. The nylon yarn section dyeing process according to claim 1, characterized in that, The spray holes of the upper spray hole group are arranged in a regular T-shape, while the spray holes of the lower spray hole group are arranged in an inverted T-shape.

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