Continuous waterless dyeing apparatus for polyester fabric and dyeing method

Abstract

The present invention belongs to the technical field of dyeing facilities. Particularly disclosed is a continuous waterless dyeing apparatus for a polyester fabric, the apparatus comprising: a pretreatment module, which comprises a first feed channel, and a spraying mechanism and a first drying mechanism which are sequentially arranged in a direction of the length of the first feed channel; a dyeing module, which comprises a dyeing box, a drying box, a second spraying mechanism arranged in the dyeing box, and a heating mechanism arranged in the drying box; a post-treatment module, which comprises a second feed channel, and a third spraying mechanism and a second drying mechanism which are sequentially arranged in a direction of the length of the second feed channel; and a recovery system unit, which is configured for condensation recovery of a non-water cleaning solvent. In the apparatus, the non-water cleaning solvent can be recovered and reused by means of the recovery system unit. Compared with a transmission dyeing method in which water is used, the apparatus can save water and reduce the generation of waste water, which is conducive to environmental development and protection and achieves energy conservation and emission reduction.

Description

Continuous waterless dyeing equipment and dyeing method for polyester fabric Technical Field

[0001] The invention relates to the technical field of dyeing facilities, in particular to continuous waterless dyeing equipment and a dyeing method for polyester fabrics. Background Art

[0002] Polyester is a synthetic fiber widely used in textiles, boasting excellent overall performance. Before weaving, polyester filament fabrics must be sizing to coat the surface of the filaments with a smooth, flexible, and strong film. This enhances the cohesiveness and abrasion resistance of the polyester filaments, enabling them to withstand the various friction and tension forces encountered during the weaving process.

[0003] Polyester fiber is a hydrophobic fiber made from polyethylene terephthalate. Due to its compact molecular chain structure and lack of hydrophilic groups such as carboxyl and sulfonic acid groups, polyester cannot be dyed with direct dyes, acid dyes, or basic dyes. Currently, the dyeing and finishing process for polyester fabrics involves desizing with liquid alkali, then washing it several times with warm water, adjusting the pH of the slurry to 6-6.5, and then immersing it in a dye bath using simple disperse dyes. After dyeing, it undergoes a reduction wash followed by another neutralization wash.

[0004] Therefore, during the polyester fabric dyeing process, after desizing and cleaning, the pH value of the slurry needs to be adjusted to a range of 5 to 6. After desizing, the pH value of the polyester fabric surface and the inside of the fiber is in an alkaline environment of 9-10, and it needs to be adjusted to a weakly acidic environment with acid. The process of adjusting the pH value is cumbersome and increases the use of water, resulting in a long polyester fabric dyeing process and high water consumption. According to statistics, the industry discharges more than 4 million tons of sewage into rivers, lakes and seas every day. Moreover, the wastewater composition is complex and changeable, with high chroma and alkalinity, extremely high COD fluctuation range and BOD, making it very difficult to treat and not in line with the industry's environmental protection development trend. Technical issues

[0005] In response to the problems in the prior art, the purpose of the present invention is to provide a continuous waterless dyeing equipment for polyester fabrics, which can recycle the non-aqueous cleaning solvent through a recovery system unit. Compared with the transmission dyeing method that uses water, this device can save water, reduce the generation of wastewater, benefit environmental development and protection, and achieve energy conservation and emission reduction. Technical Solutions

[0006] In order to achieve the above object, the technical solution of the present invention is:

[0007] Design a continuous waterless dyeing equipment for polyester fabrics, including:

[0008] The pretreatment module includes a first material channel and a spraying mechanism and a first drying mechanism sequentially arranged along the length of the first material channel, wherein the spraying mechanism is used to spray a non-aqueous cleaning solvent onto the polyester fabric passing through the first material channel, and the first drying mechanism is used to dry the polyester fabric;

[0009] The dyeing module includes a dyeing box, a drying box, a second spraying mechanism disposed in the dyeing box, and a heating mechanism disposed in the drying box. The polyester fabric treated by the pretreatment module passes through the drying box and the dyeing box in sequence. The second spraying mechanism is used to spray dyeing liquid onto the polyester fabric entering the dyeing box.

[0010] A post-processing module includes a second material channel and a third spraying mechanism and a second drying mechanism sequentially arranged along the length of the second material channel, the third spraying mechanism being used to spray a first non-aqueous cleaning solvent onto the polyester fabric discharged from the drying box and passing through the second material channel, and the second drying mechanism being used to drain the first non-aqueous cleaning solvent from the polyester fabric;

[0011] and a recovery system unit for condensing and recovering the non-aqueous cleaning solvent;

[0012] Wherein, the non-aqueous cleaning solvent comprises one or a mixture of at least two of hydrofluoroether, liquid tetrafluoroethane, tetrachloroethylene, and liquid carbon dioxide;

[0013] The dyeing solution includes a mixture of a non-aqueous cleaning solvent and a dye.

[0014] Furthermore, the first spray mechanism and the third spray mechanism have the same structure and both include a plurality of cleaning nozzles;

[0015] The first drying mechanism and the second drying mechanism have the same structure, both comprising a pair of cloth guide rollers arranged in parallel and a hot air duct located downstream of the cloth guide roller. The polyester fabric is clamped between the pair of cloth guide rollers, and the polyester fabric passes through the hot air duct.

[0016] Furthermore, it also includes a first liquid storage tank for storing non-aqueous cleaning solvent, and the outlet of the first liquid storage tank is connected to the cleaning nozzle pipe through a suction pump.

[0017] Furthermore, the second spraying mechanism includes:

[0018] A mesh roller placed in the dyeing box and wound around the grey fabric;

[0019] and a first dyeing nozzle located on the inner side of the anilox roller and a second dyeing nozzle located on the outer side of the anilox roller.

[0020] Furthermore, it also includes a collecting tank arranged in the dyeing box, which is used to collect the dyeing liquid dripping from the grey cloth;

[0021] Wherein, the anilox roller, the first dyeing nozzle and the second dyeing nozzle are all located in the dyeing tank.

[0022] Furthermore, the main shaft of the screen roller is provided with an axial channel, which is communicated with a first spray head installed on the main shaft, and the axial channel and the second dyeing spray head are both connected to a second liquid storage tank pipe storing dyeing liquid through a suction pump.

[0023] Furthermore, the drying mechanism includes a heating roller around which the grey cloth is wound;

[0024] Wherein, the heating roller is an electromagnetic heating roller.

[0025] Furthermore, the first exhaust port of the dyeing box and the second exhaust port of the drying box are respectively connected to a first negative pressure exhaust fan and a second negative pressure exhaust fan; and the dyeing box and the drying box are respectively provided with a first return air port and a second return air port; wherein, the first negative pressure exhaust fan and the second negative pressure exhaust fan are both connected to the recovery system unit pipe;

[0026] The first return air outlet and the second return air outlet are both equipped with a heating device for adjusting the temperature of the inflowing air; and the heating device is a hot air blower.

[0027] Furthermore, the recovery system unit includes a cooler and a third liquid storage tank, the first negative pressure exhaust fan and the second negative pressure exhaust fan are both connected to the feed inlet pipe of the cooler, and the discharge port of the cooler is connected to the third liquid outlet tank pipe; wherein, the first material channel, the second material channel, and the hot air duct are all connected to the feed inlet pipe of the cooler through a suction pump.

[0028] In addition, a polyester fabric dyeing method is applied to any of the above-mentioned polyester fabric continuous waterless dyeing equipment, comprising the following steps:

[0029] Step 1: Use a non-aqueous cleaning solvent to spray and clean the polyester fabric, and then dry it;

[0030] Step 2: Spray the dried polyester fabric with a dyeing solution prepared from a non-aqueous cleaning solvent and dye, and dry it;

[0031] Step 3: The polyester fabric dried in step 2 is spray-cleaned with a non-aqueous cleaning solvent and then dried to obtain a finished polyester fabric. Beneficial effects

[0032] Compared with the prior art, the continuous waterless dyeing equipment for polyester fabric provided by the present invention has a unique structure. It can replace water with a non-aqueous cleaning solvent to clean and dry the polyester fabric through the first spraying mechanism and the first drying mechanism in the pre-treatment module. Then, the second spraying mechanism of the dyeing module sprays the dyeing liquid to dye the polyester fabric. The polyester fabric is dried by the heating mechanism in the drying box to fix the color. Finally, the third spraying mechanism and the second drying mechanism in the post-treatment module are used to rinse and dry the polyester fabric, thereby removing floating color and impurities on the polyester fabric, so that the polyester fabric achieves a certain color fastness and cleanliness.

[0033] Therefore, this device can recycle the non-aqueous cleaning solvent through the recovery system unit. Compared with the transmission dyeing method that uses water, this device can save water, reduce the generation of wastewater, be beneficial to environmental development and protection, and achieve energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 is a schematic diagram of the main structure of the present application;

[0036] Figure 2 is a schematic structural diagram of the dyeing module.

[0037] In the figure: 1. First cloth inlet, 2. Dyeing box, 3. First return air outlet, 4. Polyester fabric, 5. Heating roller, 6. Second cloth outlet, 7. Collecting tank, 8. Net roller, 9. First exhaust port, 10. Drying box, 11. Second return air outlet, 12. First liquid storage tank, 13. First material channel, 14. First spray mechanism, 15. Cloth guide roller, 16. Hot air duct, 17. Second material channel, 18. Third spray mechanism. Modes for Carrying Out the Invention

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] As shown in Figures 1 and 2, as a preferred embodiment of the present invention, a continuous waterless dyeing device for polyester fabrics includes: a pretreatment module, including a first material channel 13 and a spraying mechanism and a first drying mechanism sequentially arranged along the length direction of the first material channel 13, the spraying mechanism is used to spray a non-aqueous cleaning solvent onto the polyester fabric 4 passing through the first material channel 13, and the first drying mechanism is used to dry the polyester fabric 4; a dyeing module, including a dyeing box 2, a drying box 10, and a second spraying mechanism arranged in the dyeing box 2 and a heating mechanism arranged in the drying box 10. The polyester fabric 4 treated by the pretreatment module passes through the drying box 10 and the dyeing box 2 in sequence, and the second spraying mechanism is used to spray a non-aqueous cleaning solvent onto the polyester fabric 4 passing through the first material channel 13. The mechanism is used to spray dyeing liquid onto the polyester fabric 4 entering the dyeing box 2; and the post-processing module includes a second material channel 17 and a third spraying mechanism 18 and a second drying mechanism arranged in sequence along the length direction of the second material channel 17, the third spraying mechanism 18 is used to spray the first non-aqueous cleaning solvent onto the polyester fabric 4 discharged from the drying box 10 and passing through the second material channel 17, and the second drying mechanism is used to discharge the first non-aqueous cleaning solvent in the polyester fabric 4; wherein the non-aqueous cleaning solvent includes one or a mixture of at least two of hydrofluoroether, liquid tetrafluoroethane, tetrachloroethylene, and liquid carbon dioxide; the dyeing liquid includes a mixture of a non-aqueous cleaning solvent and a dye.

[0040] The above-mentioned pretreatment module, dyeing module and post-treatment module are connected in sequence. Among them, the pre-treatment module is used to clean the lubricating oil and other pollutants in the polyester fabric 4 that are contaminated during the fabric manufacturing process, so as to avoid color spots during the dyeing process; the dyeing module is used to spray the polyester fabric 4 after cleaning and drying by the pre-treatment module with dyeing liquid and dry it to fix the color; the post-treatment module has the same structure as the pre-treatment module, but the difference is that the post-treatment module is used to clean off the floating color and impurities on the polyester fabric 4, so that the final polyester fabric 4 can achieve a certain color fastness and cleanliness.

[0041] Specifically, the polyester fabric 4 enters the first material channel 13 from the left, is dragged and driven by the traction mechanism, and enters the first spray mechanism 14. The solvent pump draws non-aqueous cleaning solvent from the first liquid storage tank 12 and sprays it onto the surface of the polyester fabric 4. Then, after being squeezed by the cloth guide roller 15, it enters the second second spray mechanism for spraying. After being squeezed again, it enters a hot air duct with hot air for drying and then enters the dyeing module.

[0042] The polyester fabric 4 enters the dyeing box 2 through the first fabric inlet 1, is sprayed with dyeing liquid by the second spray mechanism, and then passes through the second fabric guide roller 15 to squeeze out excess dyeing liquid before entering the drying box 10. The non-aqueous cleaning solvent in the polyester fabric 4 is evaporated by the high temperature of 180 degrees, and the dye is completely fixed on the polyester fabric 4. The gas generated by the evaporation of the non-aqueous cleaning solvent enters the recovery system unit for reuse;

[0043] The dyed polyester fabric 4 enters the second material channel 17 from the second fabric outlet 6 of the drying box and is sprayed with a non-aqueous cleaning solvent by the third spraying mechanism 18 to clean the floating color and impurities on the fabric, and then dried to ensure that the polyester fabric 4 has a certain color fastness and cleanliness.

[0044] It should be noted that the recovery system unit is used to condense and recover the non-aqueous cleaning solvent brought out by the hot air in the pre-treatment module, dyeing module, and post-treatment module, and repeatedly recycle it, replacing the traditional method of using water as a solvent, which can save water and has low recycling costs;

[0045] When the continuous waterless dyeing equipment for polyester fabrics provided by the present invention is used, a non-aqueous cleaning solvent can be used instead of water to clean and dry the polyester fabric 4 through the first spraying mechanism 14 and the first drying mechanism in the pre-treatment module. Then, the dyeing liquid is sprayed through the second spraying mechanism of the dyeing module to dye the polyester fabric 4, and the polyester fabric 4 is dried by the heating mechanism in the drying box 10 to fix the color. Finally, the third spraying mechanism 18 and the second drying mechanism in the post-treatment module are used to rinse and dry, thereby removing floating color and impurities on the polyester fabric 4, so that the polyester fabric 4 achieves a certain color fastness and cleanliness.

[0046] Therefore, this device can recycle the non-aqueous cleaning solvent through the recovery system unit. Compared with the transmission dyeing method that uses water, this device can save water, reduce the generation of wastewater, be beneficial to environmental development and protection, and achieve energy conservation and emission reduction.

[0047] Preferably, the bottoms of the first material channel 13 and the second material channel 17 are recessed downward to form a receiving tank to collect dripping non-aqueous cleaning solvent, and the bottom of the receiving tank is connected to the upper end of the first liquid storage pipe below it, so that collection and recycling can be achieved.

[0048] On the basis of the above embodiment, the first spray mechanism 14 and the third spray mechanism 18 have the same structure and both include a plurality of cleaning nozzles;

[0049] That is, the first spray mechanism 14 includes a plurality of cleaning nozzles sequentially arranged along the circumference of the first material channel 13. The polyester fabric 4 moving along the first material channel 13 passes through the channel surrounded by the cleaning nozzles, and the non-aqueous cleaning solvent can be evenly sprayed on the polyester fabric 4.

[0050] Obviously, since the third spray mechanism 18 has the same structure as the first spray mechanism 14, the third spray mechanism 18 includes a plurality of cleaning nozzles sequentially arranged along the circumference of the second material channel 17. The polyester fabric 4 moving along the second material channel 17 passes through the channel surrounded by the cleaning nozzles, and the non-aqueous cleaning solvent can be evenly sprayed on the polyester fabric 4.

[0051] The first drying mechanism and the second drying mechanism have the same structure, both comprising a pair of parallel cloth guide rollers 15 and a hot air duct 16 located downstream of the cloth guide rollers. The polyester fabric 4 is clamped between the pair of cloth guide rollers 15 and passes through the hot air duct 16.

[0052] The polyester fabric 4 sprayed with the non-aqueous cleaning solvent is squeezed by a pair of cloth guide rollers 15, and then the excess non-aqueous cleaning solvent is discharged to cooperate with the subsequent hot air duct 16 to improve the drying efficiency; it should be noted that the hot air can evaporate the non-aqueous cleaning solvent. The non-aqueous cleaning solvent is a volatile medium, and the non-aqueous cleaning solvent can be recovered by condensing the hot air.

[0053] On the basis of the above embodiment, it further includes a first liquid storage tank 12 for storing non-aqueous cleaning solvent, and the outlet of the first liquid storage tank 12 is connected to the cleaning nozzle pipe through a suction pump;

[0054] The wastewater cleaning solvent can be pumped to the cleaning nozzle through a suction pump and pressure is provided so that it can be sprayed out from the cleaning nozzle.

[0055] Based on the above embodiment, the second spray mechanism includes: a mesh roller 8 arranged in the dyeing box 2 and around which the grey cloth is wound; a first dyeing nozzle located inside the mesh roller 8 and a second dyeing nozzle located outside the mesh roller 8 .

[0056] During operation, the polyester fabric 4 is introduced onto the anilox roller 8 , and a plurality of first dyeing nozzles and second dyeing nozzles are provided inside and outside the anilox roller 8 to spray dyeing liquid, including the front and back sides of the polyester fabric 4 , so as to dye the polyester fabric 4 .

[0057] For better technical effects, on the basis of the above embodiment, it also includes a collection tank 7 arranged in the dyeing box 2, which is used to collect the dyeing liquid dripping from the grey cloth; wherein the anilox roller 8, the first dyeing nozzle and the first dyeing nozzle are all located in the dyeing tank.

[0058] The dyeing liquid can be collected through the collecting tank 7, so that the dyeing liquid can be recycled; preferably, the collecting tank 7 is connected to the first dyeing nozzle and the second dyeing nozzle pipe through a suction pump.

[0059] On the basis of the above embodiment, the main shaft of the screen roller 8 is provided with an axial channel, which is connected to the first spray head installed on the main shaft, and the axial channel and the second dyeing nozzle are both connected to the second liquid storage tank pipe for storing the dyeing liquid through a suction pump; wherein the dyeing liquid can be pre-configured and stored in the second liquid storage tank.

[0060] On the basis of the above embodiment, the drying mechanism includes a heating roller 5 around which the grey cloth is wound; wherein the heating roller 5 is an electromagnetic heating roller 5 .

[0061] The polyester fabric 4 in the dyeing box 2 passes through at least one heating roller 5, which fully heats the non-aqueous cleaning solvent in the dyeing box into gas and evaporates it completely, thereby achieving drying.

[0062] On the basis of the above embodiment, the first exhaust port 9 of the dyeing box 2 and the second exhaust port of the drying box 10 are respectively connected to the first negative pressure exhaust fan and the second negative pressure exhaust fan; and the dyeing box 2 and the drying box 10 are respectively provided with a first return air port 3 and a second return air port 11; wherein, the first negative pressure exhaust fan and the second negative pressure exhaust fan are both connected to the recovery system unit pipe; the first return air port 3 and the second return air port 11 are both equipped with a heating device for adjusting the temperature of the incoming air; and the heating device is a hot air blower.

[0063] The gas generated by the volatilization of the non-aqueous cleaning solvent is collected and harmlessly treated; the gas generated by the volatilization of the non-aqueous cleaning solvent is collected and converted into liquid for reuse; the recovery system unit is an existing technology and will not be described in detail.

[0064] Specifically, the recovery system unit includes a cooler and a third liquid storage tank. The first negative pressure exhaust fan and the second negative pressure exhaust fan are both connected to the feed inlet pipe of the cooler, and the discharge port of the cooler is connected to the third liquid outlet tank pipe. The first material channel 13, the second material channel 17, and the hot air duct 16 are all connected to the feed inlet pipe of the cooler through a suction pump. The cooler can be a heat exchanger.

[0065] The temperature of the gas entering the dyeing box 2 and the drying box 10 can be adjusted to ensure that the gas temperature in the dyeing box 2 is between 10 and 25° C., thereby reducing the volatilization rate of the non-aqueous cleaning solvent in the dyeing box 2 and enabling the reuse of the non-aqueous cleaning solvent falling into the dyeing tank.

[0066] It is necessary to ensure that the air temperature in the drying box 10 is between 40° C. and 70° C. so that the solvent in the fabric can be completely evaporated.

[0067] In addition, a polyester fabric dyeing method is applied to the continuous waterless dyeing device for polyester fabric 4 described in any one of the above items, comprising the following steps:

[0068] Step 1: spraying and cleaning the polyester fabric 4 with a non-aqueous cleaning solvent and drying it;

[0069] Step 2: spraying the dried polyester fabric 4 with a dyeing solution prepared from a non-aqueous cleaning solvent and a dye, and drying;

[0070] Step 3: The polyester fabric 4 dried in step 2 is spray-cleaned with a non-aqueous cleaning solvent and then dried to obtain a finished polyester fabric 4.

[0071] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0072] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0073] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A continuous waterless dyeing device for polyester fabrics, characterized in that: include: The pretreatment module comprises a first material channel and a spraying mechanism and a first drying mechanism sequentially arranged along the length direction of the first material channel, wherein the spraying mechanism is used to spray a non-aqueous cleaning solvent onto the polyester fabric passing through the first material channel, and the first drying mechanism is used to dry the polyester fabric; The dyeing module comprises a dyeing box, a drying box, a second spraying mechanism arranged in the dyeing box, and a heating mechanism arranged in the drying box. The polyester fabric treated by the pretreatment module passes through the drying box and the dyeing box in sequence. The second spraying mechanism is used to spray dyeing liquid on the polyester fabric entering the dyeing box. A post-processing module, comprising a second material channel and a third spraying mechanism and a second drying mechanism sequentially arranged along the length direction of the second material channel, wherein the third spraying mechanism is used to spray a first non-aqueous cleaning solvent onto the polyester fabric discharged from the drying box and passing through the second material channel, and the second drying mechanism is used to discharge the first non-aqueous cleaning solvent in the polyester fabric; and a recovery system unit for condensing and recovering the non-aqueous cleaning solvent; Wherein, the non-aqueous cleaning solvent comprises one or a mixture of at least two of hydrofluoroether, liquid tetrafluoroethane, tetrachloroethylene, and liquid carbon dioxide; The dyeing solution includes a mixture of a non-aqueous cleaning solvent and a dye.

2. The continuous waterless dyeing equipment for polyester fabric according to claim 1, characterized in that: The first spray mechanism and the third spray mechanism have the same structure and both include a plurality of cleaning nozzles; The first drying mechanism and the second drying mechanism have the same structure, both comprising a pair of cloth guide rollers arranged in parallel and a hot air duct located downstream of the cloth guide roller. The polyester fabric is clamped between the pair of cloth guide rollers, and the polyester fabric passes through the hot air duct.

3. The continuous waterless dyeing equipment for polyester fabric according to claim 2, characterized in that: It also includes a first liquid storage tank for storing non-aqueous cleaning solvent, and the outlet of the first liquid storage tank is connected to the cleaning nozzle pipe through a suction pump.

4. The continuous waterless dyeing equipment for polyester fabric according to claim 3, characterized in that: The second spray mechanism comprises: A mesh roller arranged in the dyeing box and for the grey cloth to be wound around; And a first dyeing nozzle located on the inner side of the screen roller and a second dyeing nozzle located on the outer side of the screen roller.

5. The continuous waterless dyeing equipment for polyester fabric according to claim 4, characterized in that: It also includes a collecting tank arranged in the dyeing box, which is used to collect the dyeing liquid dripping from the grey cloth; Wherein, the screen roller, the first dyeing nozzle and the second dyeing nozzle are all located in the dyeing tank.

6. The continuous waterless dyeing equipment for polyester fabric according to claim 5, characterized in that: The main shaft of the screen roller is provided with an axial channel, the axial channel is communicated with a first spray head installed on the main shaft, and the axial channel and the second dyeing spray head are both connected to a second liquid storage tank pipe storing dyeing liquid through a suction pump.

7. The continuous waterless dyeing equipment for polyester fabric according to claim 6, characterized in that: The drying mechanism comprises a heating roller around which the grey cloth is wound; Wherein, the heating roller is an electromagnetic heating roller.

8. The continuous waterless dyeing equipment for polyester fabric according to claim 7, characterized in that: The first exhaust port of the dyeing box and the second exhaust port of the drying box are respectively connected to the first negative pressure exhaust fan and the second negative pressure exhaust fan; and the dyeing box and the drying box are respectively provided with a first return air port and a second return air port; wherein the first negative pressure exhaust fan and the second negative pressure exhaust fan are both connected to the recovery system unit pipe; The first return air outlet and the second return air outlet are both equipped with a heating device for adjusting the temperature of the inflowing air; and the heating device is a hot air blower.

9. The continuous waterless dyeing equipment for polyester fabric according to claim 8, characterized in that: The recovery system unit includes a cooler and a third liquid storage tank. The first negative pressure exhaust fan and the second negative pressure exhaust fan are both connected to the feed inlet pipe of the cooler, and the discharge port of the cooler is connected to the third liquid outlet tank pipe; wherein the first material channel, the second material channel, and the hot air duct are all connected to the feed inlet pipe of the cooler through a suction pump.

10. A method for dyeing polyester fabric, applied to the continuous waterless dyeing equipment for polyester fabric according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Use a non-aqueous cleaning solvent to spray and clean the polyester fabric, and then dry it; Step 2: spraying the dried polyester fabric with a dyeing solution prepared from a non-aqueous cleaning solvent and a dye, and drying; Step 3: The polyester fabric dried in step 2 is spray-cleaned with a non-aqueous cleaning solvent, and then dried to obtain a finished polyester fabric.

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