Waterless dyeing production line and process

Abstract

The invention discloses a waterless dyeing production line and a waterless dyeing process wherein the production line comprises a yarn releasing frame, a dye coating device, a tunnel drying oven, a rolling device and a high-temperature drying oven which are sequentially connected from front to back in a material flow mode. The dye coating device is used for coating disperse dye on the surface of the passing yarn, the tunnel drying oven is used for primarily drying the surface layer of the yarn, and the winding equipment is used for pulling the yarn at the rear end and completing winding; the high-temperature drying oven is used for performing high-temperature color development on the wire coil coated with the disperse dye. Yarn color development and dyeing are carried out in a high-temperature drying mode, a water bath mode is avoided, and the pollution discharge burden of an enterprise is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of yarn dyeing, and particularly to a waterless dyeing production line and process. Background Art

[0002] Polyester yarn is an industrial or household yarn made of polyester fiber, i.e., polyester. It can be twisted into multiple strands to make sewing thread, or used for weaving or knitting tapes. The sewing thread made of polyester fiber has high breaking strength and good wear resistance, suitable for high-speed sewing and long-term use, especially suitable for occasions that need to bear tension, such as luggage, shoes, etc.

[0003] The dyeing of polyester sewing thread is an important step in its production and manufacturing. At present, the dyeing of polyester sewing thread is carried out by using a high-temperature and high-pressure package dyeing machine to dye multiple reels of sewing thread in a water bath, and using disperse dyes to penetrate into the material of the polyester sewing thread in the high-temperature and high-pressure water flow to complete the coloring. This traditional dyeing process has relatively firm coloring, but inevitably produces a large amount of dyeing wastewater, and the dyeing wastewater needs to be specially and strictly treated before it can be discharged, which seriously increases the production burden of enterprises.

[0004] In order to overcome the above problems, a waterless dyeing production line is needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a waterless dyeing production line, which uses a high-temperature drying method for the hair coloring and dyeing of yarns, avoids the use of the water bath method, and reduces the sewage discharge burden of enterprises.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A waterless dyeing production line of the present invention includes a yarn unwinding rack, a dye coating device, a tunnel oven, a winding device, and a high-temperature oven that are connected in sequence from front to back in the material flow. The yarn unwinding rack unwinds the coiled blank of the yarn to be dyed. The dye coating device coats the surface of the passing yarn with disperse dyes. The tunnel oven preliminarily dries the surface layer of the yarn. The winding device pulls the yarn at the rear end and completes the winding. The high-temperature oven performs high-temperature hair coloring on the coiled yarn coated with disperse dyes.

[0008] Further, the yarn unwinding rack and the winding device are respectively multi-spindle synchronous unwinding and winding, and the dye coating device and the tunnel oven can coat and dry multiple yarns.

[0009] Furthermore, the dye coating device includes a coating frame, a dye tank, a wire guiding mechanism, and a scraping mechanism. The dye tank is arranged with an upward opening at the top of the coating frame, and the porridge-like disperse dye is placed in the dye tank; the wire guiding mechanism guides and conveys the yarn so that it passes through the bottom of the inner cavity of the dye tank to complete the coating; the scraping mechanism is arranged on one side of the coating frame close to the tunnel oven, and the scraping mechanism scrapes off the excess dye coated on the yarn.

[0010] Furthermore, the wire guiding mechanism includes a first wire guiding plate group, a guiding roller shaft, a bottom wire guiding frame group, and a second wire guiding plate group. The first wire guiding plate group is arranged at the feeding end of the dye coating device to guide multiple yarns in parallel at intervals. Two groups of the bottom wire guiding frame groups are arranged in parallel on the bottom plate of the inner cavity of the dye tank to guide multiple yarns in parallel at intervals. Two of the guiding roller shafts are respectively arranged between the first wire guiding plate group and the bottom wire guiding frame group, and between the bottom wire guiding frame group and the scraping mechanism; the second wire guiding plate group guides and conveys the multiple yarns output by the scraping mechanism to the tunnel oven.

[0011] Furthermore, the scraping mechanism includes a front scraper and a rear scraper. The wire guiding mechanism also includes two wire roller light cylinders. The front scraper is arranged between the rear guiding roller shaft and the front wire roller light cylinder. The front scraper is located below the yarn and the top edge can scrape the lower half of the yarn to remove the excess dye; the rear scraper is located between the front wire roller light cylinder and the rear wire roller light cylinder. The rear scraper is located above the yarn and the bottom edge can scrape the upper half of the yarn to remove the excess dye.

[0012] Furthermore, the tunnel oven includes a plurality of tunnel oven units connected end to end. Wire guiding components for distributing the yarn are arranged on the outer sides of the front and rear tunnel oven units.

[0013] Furthermore, the wire guiding component distributes multiple yarns into three rows: upper, middle, and lower. Three corresponding through wire grooves, namely upper, middle, and lower, are formed on the side wall of the oven housing of the tunnel oven unit.

[0014] Furthermore, the tunnel oven unit also includes an oven support, a heating element, and a circulating air component. The oven support supports the oven housing in the shape of a square box, and both the heating element and the circulating air component are arranged in the cavity of the oven housing.

[0015] Further, the circulating air component includes a motor, a centrifugal fan, and a partition plate. The partition plate is horizontally and spacedly arranged at the upper part of the cavity of the oven housing and divides it into a wind pressure chamber in the upper part and a drying chamber in the lower part. An air inlet opening is formed in the middle of the partition plate, and a plurality of air outlet holes are evenly distributed around the air inlet opening. The motor is installed with its head facing downwards at the middle position of the top plate of the oven housing. The output shaft of the motor is connected to the centrifugal fan. The air inlet of the centrifugal fan faces the air inlet opening, and the air outlet faces the periphery.

[0016] The present invention also discloses a sewage-free yarn dyeing process, which includes the following steps:

[0017] S1. Yarn feeding: The polyester yarns to be dyed are output one by one, arranged at intervals in multiple strands and conveyed backward.

[0018] S2. Dye coating: The polyester yarns pass through a container filled with disperse dyes to complete adherent coating.

[0019] S3. Surface drying: The surface of the dyes on the polyester yarns is dried by using hot air or baking, and the temperature is controlled at 70°C - 80°C.

[0020] S4. Rewinding: The surface-dried yarns are wound onto bobbins.

[0021] S5. High-temperature color development: The yarn bobbins in the above steps are baked at a high temperature, the temperature is controlled at 145°C - 155°C, the color development time is 1h - 2h, and the discharged materials are cooled naturally.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0023] The sewage-free dyeing production line of the present invention avoids the use of water-bath dyeing by directly performing high-temperature color development after coating disperse dyes, does not generate dyeing sewage, and the dyes are fully absorbed and utilized without being dispersed into the waste water, saving dyes. The surface of the yarns is dried by a tunnel oven, reducing the dripping waste of dyes during winding and transfer to the high-temperature oven. The sewage-free dyeing production line of the present invention uses a high-temperature drying method for yarn color development and dyeing, avoiding the use of the water-bath method and reducing the sewage discharge burden of enterprises.

[0024] In addition, the use of multiple yarns for synchronous guiding, coating and drying further improves the efficiency of dyeing operations. The dye trough with the opening facing upward facilitates the use of the guide mechanism to guide the yarn through the bottom of the inner cavity of the dye trough to complete the adhesive coating; by adding the scraper mechanism, the excess dye adhering to the surface of the yarn can be removed, and at the same time, the disperse dye can be squeezed into the fiber filaments of the yarn, which is convenient for the later color development. By reasonably setting the first wire plate group, the guide roller, the bottom wire frame group and the second wire plate group, multiple parallel and spaced yarns transported backward can be stably guided without disorder, ensuring that each yarn is in uniform contact with the disperse dye and achieving a consistent coating effect. By setting the front scraper and the rear scraper, the excess dye on the entire outer peripheral surface of the yarn can be effectively removed, and the dye can be squeezed into the fiber filaments of the yarn. By setting the wire roller polishing cylinder, on the one hand, the support force for the yarn to approach the scraper is increased, so that the scraper and the yarn are fully squeezed and contacted, and on the other hand, the non-rotating smooth cylinder surface can squeeze the yarn so that it slightly opens the gap between the fiber lines, which is convenient for cooperating with the scraper to squeeze the disperse dye into the gap. The tunnel oven composed of multiple tunnel oven units connected end to end reduces the difficulty of processing a long tunnel oven; through the cooperation of the wire assembly and the wire groove, the height space of the inner cavity of the oven shell can be fully utilized, and the drying efficiency is improved. By reasonably setting the inner cavity of the oven shell as a drying chamber and a wind pressure chamber, the up and down circulation of hot air in the cavity is realized, and the hot air continuously passes over the transported yarn, improving the drying effect. By adding a window on the front side wall of the oven shell, it is convenient to observe the internal situation of the drying chamber on the one hand, and it is convenient for later maintenance and cleaning on the other hand.

[0025] The sewage-free yarn dyeing process of the present invention realizes reasonable and sufficient yarn slurrying and sufficient mixing of dyes by reasonably configuring the apparent state of disperse dyes; through high-temperature color development, the dyes can be reliably dyed and locked inside the fibers to ensure color fastness. By adding automatic color adjustment equipment and dye color adjustment procedures, disperse dye slurry with different color requirements can be automatically prepared, and in conjunction with the main production process of the present invention, the production of small batches of yarn samples with different colors can be flexibly met. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 It is a schematic diagram of the composition of the waterless dyeing production line of the present invention;

[0028] Figure 2 It is a schematic diagram of the front and cross-sectional structure of the dye coating device of the present invention;

[0029] Figure 3 It is a schematic diagram of the top view of the dye coating device of the present invention;

[0030] Figure 4 This is the schematic front sectional view of the tunnel oven unit of the present invention;

[0031] Figure 5 This is the schematic left view of the tunnel oven unit of the present invention;

[0032] Figure 6 This is the schematic process flow diagram of the sewage-free yarn dyeing of the present invention.

[0033] Explanation of reference numerals: 1. Yarn rack; 2. Dye coating device; 201. Coating frame; 202. Dye tank; 203. First wire board group; 204. Wire roller shaft; 205. Bottom wire frame group; 206. Front scraper; 207. Wire roller light cylinder; 208. Rear scraper; 209. Second wire board group; 210. Discharge pipe group; 3. Tunnel oven; 301. Wire assembly; 302. Oven support; 303. Oven shell; 3031. Through wire slot; 304. Heating element; 305. Window opening; 306. Motor; 307. Centrifugal fan; 308. Partition board; 309. Air inlet opening; 310. Air pressure chamber; 311. Drying chamber; 4. Rewinding equipment; 5. High-temperature oven. Detailed implementation manners

[0034] The core of the present invention is to provide a waterless dyeing production line, which uses high-temperature drying to carry out the color development and dyeing of yarns, avoids the use of water bath method, and reduces the sewage discharge burden of enterprises.

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0037] Referring to the accompanying drawings, Figure 1 This is the schematic diagram of the composition of the waterless dyeing production line of the present invention; Figure 2 This is the schematic front sectional view of the dye coating device of the present invention; Figure 3Schematic top view structure diagram of the dye coating device of the present invention; Figure 4 Schematic front sectional view structure diagram of the tunnel oven unit of the present invention; Figure 5 Schematic left view structure diagram of the tunnel oven unit of the present invention; Figure 6 Schematic process flow diagram of the sewage-free yarn dyeing of the present invention.

[0038] In a specific embodiment, as Figures 1 to 5 shown, the anhydrous dyeing production line of the present invention includes a yarn unwinding rack 1, a dye coating device 2, a tunnel oven 3, a winding device 4, and a high-temperature oven 5 that are connected in sequence from front to back in a material flow. The yarn unwinding rack 1 unwinds the coiled blank of the yarn to be dyed. The yarn is made of polyester material. The yarn unwinding rack 1 guides the single yarn output and conveys it backward. The dye coating device 2 coats the surface of the passing yarn with disperse dyes, and the disperse dyes used are porridge-like slurries. The tunnel oven 3 preliminarily dries the dyes on the surface of the yarn and heats and dries them by baking. The winding device 4 pulls the yarn at the rear end and completes winding, which is the reverse process of the yarn unwinding rack 1. The high-temperature oven 5 performs high-temperature color development on the wound coil coated with disperse dyes.

[0039] By directly performing high-temperature color development after coating with disperse dyes, the use of water bath dyeing is avoided, no dyeing sewage is generated, and the dyes are fully absorbed and utilized without being dispersed into the wastewater, saving dyes. By drying the surface of the yarn through the tunnel oven 3, the dripping waste of dyes during the winding and transfer to the high-temperature oven 5 is reduced. The anhydrous dyeing production line of the present invention uses a high-temperature drying method for yarn color development and dyeing, avoiding the use of a water bath method and reducing the enterprise's sewage discharge burden.

[0040] In a specific embodiment of the present invention, as Figures 1 to 5 shown, the yarn unwinding rack 1 and the winding device 4 are respectively multi-spindle synchronous unwinding and winding, and the dye coating device 2 and the tunnel oven 3 can coat and dry multiple yarns.

[0041] Adopting synchronous guiding, coating, and drying of multiple yarns further improves the dyeing operation efficiency.

[0042] In a specific embodiment of the present invention, as Figures 1 to 3As shown, the dye coating device 2 includes a coating frame 201, a dye tank 202, a wire guiding mechanism, and a scraping mechanism. The coating frame 201 is a frame structure welded by square tubes. The dye tank 202 is arranged on the top of the coating frame 201 with an upward opening, and the porridge-like disperse dye is placed in the cavity of the dye tank 202. The wire guiding mechanism guides and conveys the yarn so that it passes through the bottom of the inner cavity of the dye tank 202 to complete the adhesion coating. The scraping mechanism is arranged on one side of the coating frame 201 close to the tunnel oven 3, and the scraping mechanism is also located above the dye tank 202. The scraping mechanism scrapes off the excess dye coated on the yarn and makes it fall back into the dye tank 202 again.

[0043] Specifically, as Figure 2 and Figure 3 shown, a discharge pipe assembly 210 is installed under the bottom plate of the dye tank 202. The top end of the discharge pipe assembly 210 is communicated with the cavity of the dye tank 202, and a ball valve is installed on the discharge pipe of the discharge pipe assembly 210.

[0044] By arranging the dye tank 202 with an upward opening, it is convenient to use the wire guiding mechanism to guide the yarn to pass through the bottom of the inner cavity of the dye tank 202 to complete the adhesion coating; by adding the scraping mechanism, the excess dye adhered to the surface of the yarn can be removed, and at the same time, the disperse dye is extruded into the fine fiber lines of the yarn, which is convenient for later color development.

[0045] Specifically, as Figure 2 and Figure 3 shown, the wire guiding mechanism includes a first wire guiding plate group 203, a guiding roller shaft 204, a bottom wire guiding frame group 205, and a second wire guiding plate group 209. The first wire guiding plate group 203 is arranged at the feeding end of the dye coating device 2 to guide multiple yarns in parallel at intervals. Two groups of bottom wire guiding frame groups 205 are arranged in parallel on the bottom plate of the inner cavity of the dye tank 202 to guide multiple yarns in parallel at intervals. Two guiding roller shafts 204 are respectively arranged between the first wire guiding plate group 203 and the bottom wire guiding frame group 205 and between the bottom wire guiding frame group 205 and the scraping mechanism. The second wire guiding plate group 209 guides and conveys the multiple yarns output by the scraping mechanism to the tunnel oven 3.

[0046] Specifically, as Figure 2 and Figure 3 shown, the first wire guiding plate group 203 includes an angle steel body and a wire clamping sleeve. Both ends of the angle steel body are fixedly connected to the top of the coating frame 201. A plurality of U-shaped grooves are equally spaced along the length direction on the vertical wall of the angle steel body, and each U-shaped groove is provided with a wire clamping sleeve, and the yarn passes through the wire clamping sleeve. Specifically, the wire clamping sleeve is made of a plastic ring sleeve or a rubber ring sleeve. The structure of the second wire guiding plate group 209 is the same as that of the first wire guiding plate group 203.

[0047] Specifically, asFigure 2 and Figure 3 As shown in Figure 3 , the guiding roller shaft 204 is a shaft cylinder that can rotate around the core shaft. Both ends of the core shaft are fixedly connected to the side walls of the dye tank 202. A plurality of annular grooves are arranged at equal intervals along the length direction on the outer wall of the shaft cylinder, and the yarn is guided and conveyed through the annular grooves.

[0048] Specifically, as Figure 2 and Figure 3 shown, the bottom wire guide frame group 205 includes support angle steels and wire frame bars. Both ends of the support angle steels are fixedly connected to the side walls at the bottom of the dye tank 202. The bottom ends of the wire frame bars are fixedly connected to the vertical walls of the support angle steels, and a plurality of the wire frame bars are arranged at equal intervals along the length direction of the support angle steels. The top ends of the bottom ends of the wire frame bars are bent into loop shapes, and the yarn passes through the loops here and is conveyed backward. Wear-resistant materials are compounded at the loop parts at the top ends of the wire frame bars.

[0049] By reasonably arranging the first wire guide plate group 203, the guiding roller shaft 204, the bottom wire guide frame group 205 and the second wire guide plate group 209, the yarns that are conveyed backward in parallel at intervals can be stably guided, without chaos, ensuring that each yarn is in uniform contact with the disperse dye and achieving a consistent coating effect.

[0050] In a specific embodiment of the present invention, as Figure 2 and Figure 3 shown, the scraping mechanism includes a front scraper 206 and a rear scraper 208. The wire guiding mechanism further includes two wire guiding roller cylinders 207. The wire guiding roller cylinders 207 are used in cooperation with the scraping mechanism, and both ends of the wire guiding roller cylinders 207 are fixed to the top of the coating frame 201. The front scraper 206 is arranged between the rear guiding roller shaft 204 and the front wire guiding roller cylinder 207. The front scraper 206 is located below the yarn and the top edge can scrape the lower half of the yarn to remove excess dye. The rear scraper 208 is located between the front wire guiding roller cylinder 207 and the rear wire guiding roller cylinder 207. The rear scraper 208 is located above the yarn and the bottom edge can scrape the upper half of the yarn to remove excess dye.

[0051] Specifically, the front scraper 206 and the rear scraper 208 are specifically made of polytetrafluoroethylene plates, which have good lubricity and good wear resistance. Both the front scraper 206 and the rear scraper 208 are installed in the way of combining angle steels with clamping plates.

[0052] Through the settings of the front squeegee 206 and the rear squeegee 208, the excess dye on the entire outer peripheral surface of the yarn can be effectively removed, while squeezing the dye into the gaps between the fiber filaments of the yarn. Through the setting of the wire roller polishing cylinder 207, on the one hand, the support force for the yarn close to the squeegee is increased, so that the squeegee and the yarn are fully squeezed and contacted, and on the other hand, the smooth surface of the non-rotating cylinder can squeeze the yarn to slightly open the gaps between the fiber lines, facilitating the cooperation with the squeegee to squeeze the disperse dye into the gaps.

[0053] In a specific embodiment of the present invention, as Figure 1 、 Figure 4 and Figure 5 shown, the tunnel oven 3 includes a plurality of tunnel oven units connected end to end, and wire guiding assemblies 301 for distributing yarns are arranged on the outer sides of the front end and the rear end of the tunnel oven units. The wire guiding assembly 301 includes an angle steel bracket and a equipped wire clamping sleeve, which is similar in structure to the first wire guiding plate group 203.

[0054] Specifically, as Figure 1 、 Figure 4 and Figure 5 shown, the wire guiding assembly 301 distributes a plurality of yarns into three rows: upper, middle and lower, and three corresponding upper, middle and lower through wire grooves 3031 are opened on the side wall of the oven housing 303 of the tunnel oven unit.

[0055] The tunnel oven 3 composed of a plurality of the tunnel oven units connected end to end reduces the processing difficulty of the tunnel oven 3 with a longer length; through the cooperation of the wire guiding assembly 301 and the through wire grooves 3031, the height space inside the oven housing 303 can be fully utilized, improving the drying efficiency.

[0056] In a specific embodiment of the present invention, as Figure 4 and Figure 5 shown, the tunnel oven unit further includes an oven bracket 302, a heating element 304 and a circulating air assembly. The oven bracket 302 supports the oven housing 303 in the shape of a square box, and both the heating element 304 and the circulating air assembly are arranged inside the oven housing 303. Specifically, the heating element 304 can be an electric heating rod or an infrared halogen lamp tube for heating.

[0057] Specifically, as Figure 4 and Figure 5As shown in the figure, the circulating air component includes a motor 306, a centrifugal fan 307, and a partition 308. The partition 308 is horizontally and spacedly arranged at the upper part of the cavity of the oven housing 303 and divides it into a wind pressure cavity 310 in the upper part and a drying cavity 311 in the lower part. The yarn passes through the drying cavity 311, and the heating element 304 is also arranged at the bottom of the drying cavity 311. An air inlet opening 309 is formed in the middle of the partition 308, and a plurality of air outlet holes are evenly arranged around the air inlet opening 309. The motor 306 is installed head-down at the middle position of the top plate of the oven housing 303. The output shaft of the motor 306 is connected to the centrifugal fan 307. The air inlet of the centrifugal fan 307 faces the air inlet opening 309, and the air outlet faces the periphery.

[0058] By reasonably setting the inner cavity of the oven housing 303 as the drying cavity 311 and the wind pressure cavity 310, the up-and-down circulation of hot air in the cavity is realized. The hot air continuously passes over the conveyed yarn, improving the drying effect.

[0059] Specifically, as Figure 1 and Figure 4 shown in the figure, an openable window 305 is further arranged on the front side wall of the oven housing 303. The bottom of the window 305 is connected to the front outer side wall of the oven housing 303 through a hinge, and the top of the window 305 can be locked by a locking pin. Two side-by-side windows 305 are arranged on each of the tunnel oven units, and a transparent glass plate is also arranged on the window 305 as a viewing window.

[0060] By adding the window 305 on the front side wall of the oven housing 303, on the one hand, it is convenient to observe the internal situation of the drying cavity 311, and on the other hand, it is convenient for later maintenance and cleaning.

[0061] Working principle of the anhydrous dyeing production line of the present invention: The winding device 4 winds and reels multiple yarns, and continuously conveys the yarns led out from the yarn unwinding rack 1 backward. The multiple yarns led out from the yarn unwinding rack 1 first enter the dye coating device 2, are arranged in a parallel row at the first wire guide plate group 203, and sequentially pass through the front guide roller shaft 204, two groups of bottom wire guide frames 205 and the rear guide roller shaft 204 downward, and complete the fully immersed passing through the inner cavity of the dye tank 202. During the passing through process here, the surface is coated with porridge-like disperse dyes. During the continuous backward conveying of the yarns, they sequentially pass through the front scraper 206, the front wire guide roller light cylinder 207, the rear scraper 208 and the rear wire guide roller light cylinder 207. The two scrapers effectively remove the excess dyes on the entire outer peripheral surface of the yarns, and at the same time squeeze the dyes into the fiber filaments of the yarns. The second wire guide plate group 209 guides and conveys the multiple yarns output by the dye coating device 2 to the wire assembly 301 of the tunnel oven 3. The wire assembly 301 distributes the multiple yarns into three rows: upper, middle and lower, and the number of yarns in the three rows is roughly equal. The yarns sequentially pass through the drying chambers 311 of multiple tunnel oven units from front to back. The centrifugal fan 307 in the drying chamber 311 extracts the air at the middle position of the drying chamber 311 from the air inlet opening 309 and conveys it to the air pressure chamber 310. The air in the air pressure chamber 310 is conveyed downward through the air outlet holes, and the hot air circulation flow in the drying chamber 311 is completed. The flowing hot air continuously passes over the conveyed yarns, providing the drying efficiency. The winding device 4 completes the winding operation of multiple surface-dried yarns. The yarn reels are unloaded from the winding device 4 and transported into the baking chamber of the high-temperature oven 5, and high-temperature color development is carried out according to the set temperature. After reaching the set time, they are taken out and cooled naturally or by air cooling to complete the dyeing.

[0062] In summary, for the anhydrous dyeing production line of the present invention, by directly heating and coloring after coating with disperse dyes, the use of water bath dyeing is avoided, no dyeing wastewater is generated, and the dyes are fully absorbed and utilized without being dispersed into the wastewater, saving dyes. The surface of the yarn is dried by the tunnel oven 3, reducing the dripping waste of dyes during winding and transfer to the high-temperature oven 5. The anhydrous dyeing production line of the present invention uses a high-temperature drying method for the coloring and dyeing of yarns, avoiding the use of a water bath method and reducing the enterprise's sewage discharge burden. In addition, the synchronous feeding, coating, and drying of multiple yarns further improve the efficiency of the dyeing operation. The dye tank 202 with an upward opening facilitates the use of the wire guiding mechanism to guide the yarn through the bottom of the inner cavity of the dye tank 202 to complete adhesive coating; by adding the scraping mechanism, the excess dyes adhered to the surface of the yarn can be removed, and at the same time, the disperse dyes are extruded into the fine fiber lines of the yarn, facilitating subsequent coloring. By reasonably setting the first wire guiding plate group 203, the guide roller shaft 204, the bottom wire guiding frame group 205, and the second wire guiding plate group 209, multiple parallel and spaced yarns can be stably guided backward without chaos, ensuring uniform contact between each yarn and the disperse dyes and achieving a consistent coating effect. By setting the front scraper 206 and the rear scraper 208, the excess dyes on the entire outer peripheral surface of the yarn can be effectively removed, and at the same time, the dyes are extruded into the fine fiber lines of the yarn. By setting the wire guiding roller smooth cylinder 207, on the one hand, the supporting force on the yarn near the scraper is increased, enabling the scraper to fully squeeze and contact the yarn, and on the other hand, the smooth surface of the non-rotating cylinder can squeeze the yarn to slightly open the gaps between the fiber lines, facilitating the extrusion of the disperse dyes into the gaps by the scraper. The tunnel oven 3 composed of multiple tunnel oven units connected end to end reduces the processing difficulty of the tunnel oven 3 with a longer length; through the cooperation of the wire guiding component 301 and the through-line slot 3031, the height space inside the oven housing 303 can be fully utilized, improving the drying efficiency. By reasonably setting the inner cavity of the oven housing 303 as the drying chamber 311 and the air pressure chamber 310, the up-and-down circulation of hot air in the cavity is realized, and the hot air continuously passes over the conveyed yarns, improving the drying effect. By adding a window 305 on the front side wall of the oven housing 303, on the one hand, it is convenient to observe the internal situation of the drying chamber 311, and on the other hand, it is convenient for subsequent maintenance and cleaning.

[0063] As Figure 6 shown, corresponding to the anhydrous dyeing production line in the above embodiment, the present invention also discloses a sewage-free yarn dyeing process, including the following steps:

[0064] S1. Yarn feeding: The polyester yarns to be dyed are output one by one, arranged at intervals in multiple rows and conveyed backward.

[0065] S2, dye coating, the polyester yarn passes through the container of disperse dye to complete the adhesive coating; the disperse dye is a porridge-like slurry, where the slurry includes the dye body, dispersant and a small amount of water, so that the yarn that passes through by immersion can be smoothly coated with the paddle.

[0066] S3, surface drying, using hot air or baking to dry the surface of the polyester yarn, the temperature is controlled at 70℃~80℃. The moisture on the surface flows out with the hot air, and the surface of the yarn is dried first.

[0067] S4. Winding: Wind the surface-dried yarn in the bobbin, control the winding speed and winding tension, and prevent the yarn from breaking.

[0068] S5, high temperature color development, the yarn reel in the above step is baked at high temperature, the temperature is controlled at 145℃~155℃, the color development time is 1h~2h, and the material is cooled naturally. At this temperature, the fiber molecular chain segment movement of polyester is intensified, the micro-gap between the molecular chain segments is enlarged, and the dye body of the disperse dye diffuses from the fiber surface to the enlarged micro-gap. After cooling, the fiber micro-gap shrinks, and the dye body is locked inside the fiber, ensuring the color fastness.

[0069] Specifically, in step S2, a process of scraping off excess dye adhered thereto by using a scraper is also included.

[0070] By rationally configuring the apparent state of disperse dyes, the yarn can be rationally and fully coated with slurry, and the dye ratio can be fully mixed; through high-temperature color development, the dye can be reliably dyed and locked inside the fiber, ensuring the color fastness.

[0071] In a specific embodiment of the present invention, a dye coloring process is also included, in which an automatic coloring device is used to mix disperse dye slurries of multiple different basic colors to automatically adjust the disperse dye slurry that meets the color requirements, and then output it to the container in step S2.

[0072] By adding automatic color matching equipment and dye color matching procedures, the disperse dye slurry with different color requirements can be automatically prepared. In combination with the main production process of the present invention, the production of small batches of yarn sample orders with different colors can be flexibly met.

[0073] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0074] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the spirit of the design of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An anhydrous dyeing production line, characterized in that: It includes a yarn unwinding rack (1), a dye coating device (2), a tunnel oven (3), a winding equipment (4) and a high-temperature oven (5) which are connected in sequence in the material flow direction from front to back. The yarn unwinding rack (1) unwinds the coiled blanks of the yarns to be dyed. The dye coating device (2) coats the surface of the passing yarns with disperse dyes. The tunnel oven (3) preliminarily dries the surface layer of the yarns. The winding equipment (4) pulls the yarns at the rear end and completes the winding. The high-temperature oven (5) performs high-temperature color development on the wound coils coated with disperse dyes.

2. The waterless dyeing production line according to claim 1, characterized in that: The yarn unwinding rack (1) and the winding equipment (4) perform multi-spindle synchronous unwinding and winding respectively. The dye coating device (2) and the tunnel oven (3) can coat and dry multiple yarns.

3. The anhydrous dyeing production line according to claim 1, characterized in that: The dye coating device (2) includes a coating rack (201), a dye tank (202), a wire guiding mechanism and a scraping mechanism. The dye tank (202) is arranged on the top of the coating rack (201) with an upward opening, and the porridge-like disperse dyes are placed in the dye tank (202). The wire guiding mechanism guides and conveys the yarns so that they pass through the bottom cavity of the dye tank (202) to complete the coating. The scraping mechanism is arranged on one side of the coating rack (201) close to the tunnel oven (3), and the scraping mechanism scrapes off the excess dyes coated on the yarns.

4. The anhydrous dyeing production line according to claim 3, characterized in that: The wire guiding mechanism includes a first wire guiding plate group (203), a guiding roller shaft (204), a bottom wire guiding frame group (205) and a second wire guiding plate group (209). The first wire guiding plate group (203) is arranged at the feeding end of the dye coating device (2) to guide multiple yarns in parallel at intervals. The two bottom wire guiding frame groups (205) are arranged in parallel on the bottom plate of the inner cavity of the dye tank (202) to guide multiple yarns in parallel at intervals. The two guiding roller shafts (204) are respectively arranged between the first wire guiding plate group (203) and the bottom wire guiding frame group (205) and between the bottom wire guiding frame group (205) and the scraping mechanism. The second wire guiding plate group (209) guides and conveys the multiple yarns output by the scraping mechanism to the tunnel oven (3).

5. The waterless dyeing production line according to claim 4, wherein: The scraping mechanism includes a front scraper (206) and a rear scraper (208). The wire guiding mechanism also includes two wire guiding roller cylinders (207). The front scraper (206) is arranged between the rear guiding roller shaft (204) at the rear side and the front wire guiding roller cylinder (207). The front scraper (206) is located below the yarn, and the top edge can scrape the lower half of the yarn to remove the excess dyes. The rear scraper (208) is located between the front wire guiding roller cylinder (207) at the front and the rear wire guiding roller cylinder (207). The rear scraper (208) is located above the yarn, and the bottom edge can scrape the upper half of the yarn to remove the excess dyes.

6. The anhydrous dyeing production line according to claim 1, characterized in that: The tunnel oven (3) includes a plurality of tunnel oven units connected end to end. Wire guiding components (301) for distributing yarns are arranged on the outer sides of the front and rear tunnel oven units.

7. The anhydrous dyeing production line according to claim 6, wherein, The wire assembly (301) distributes multiple yarns into three rows, namely upper, middle and lower rows, and three corresponding through-line slots (3031) of upper, middle and lower are provided on the side wall of the oven housing (303) of the tunnel oven unit.

8. The waterless dyeing production line according to claim 7, characterized in that: The tunnel oven unit further includes an oven bracket (302), a heating element (304) and a circulating air assembly. The oven bracket (302) supports the oven housing (303) in the shape of a rectangular box, and the heating element (304) and the circulating air assembly are both arranged in the cavity of the oven housing (303).

9. The anhydrous dyeing production line according to claim 8, wherein, The circulating air assembly includes a motor (306), a centrifugal fan (307) and a partition plate (308). The partition plate (308) is horizontally and spacedly arranged in the upper part of the cavity of the oven housing (303) and divides it into a wind pressure chamber (310) in the upper part and a drying chamber (311) in the lower part. An air inlet opening (309) is provided in the middle of the partition plate (308), and a plurality of air outlet holes are evenly arranged around the air inlet opening (309); the motor (306) is installed head-down at the middle position of the top plate of the oven housing (303), the output shaft of the motor (306) is connected to the centrifugal fan (307), the air inlet of the centrifugal fan (307) faces the air inlet opening (309) and the air outlet faces the periphery.

10. A sewage-free yarn dyeing process, characterized in that, It includes the following steps: S1. Yarn feeding: The polyester yarns to be dyed are output one by one, arranged at intervals in multiple strands and conveyed backward. S2. Dye coating: The polyester yarns pass through the container filled with disperse dyes to complete adhesive coating. S3. Surface drying: The surface of the dyes on the polyester yarns is dried by hot air or baking, and the temperature is controlled at 70°C to 80°C. S4. Rewinding: The surface-dried yarns are wound onto bobbins. S5. High-temperature color development: The yarn bobbins in the above steps are baked at a high temperature, the temperature is controlled at 145°C to 155°C, the color development time is 1h to 2h, and the discharged materials are naturally cooled.

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