A steam-type cotton yarn processing dyeing device

Abstract

The invention discloses a steam-type dyeing device for processing cotton yarn, comprising a dyeing box, a conductor roller, a steam pipe and a suction pipe. The invention uses a suction pump to extract high-temperature steam generated by heating dye liquid in the dyeing box and spray it out through an upper outlet and a lower outlet. A suction pump 2 extracts the dye liquid in the dyeing box through the suction pipe and drives the dye liquid through a spray hole through an atomizing nozzle to form a mist, which is sprayed into a steam conveying pipe. At this time, the high-temperature steam carries the atomized dye liquid particles for transportation. The high-temperature steam carrying the dye liquid particles sprayed out of the lower outlet is directly blown toward the cotton yarn under the action of an air guide plate, and the high-temperature and high-pressure steam is used to accelerate the penetration and diffusion of dye liquid molecules into fabric fibers. The high-temperature steam carrying the dye liquid particles sprayed out of the upper outlet will be blown toward the dyed cotton yarn along the air guide plate for fumigation. The steam passes through the cotton yarn to promote the migration of dye liquid molecules from the fiber surface to the inside, and the cotton yarn is subjected to color fixation treatment, thereby improving the uniformity and consistency of dyeing.

Description

Technical Field

[0001] The invention relates to the technical field of cotton yarn processing, and more specifically to a steam-type dyeing device for cotton yarn processing. Background Art

[0002] Dyeing for cotton yarn processing is a comprehensive process involving chemical, mechanical and thermal treatments, which aims to give various colors to originally colorless or light-colored cotton yarns, enhance their aesthetics and applicability, and achieve high-quality, uniform and long-lasting cotton yarn dyeing to meet various needs of textile processing.

[0003] The existing dyeing device first cleans and pre-wet the cotton yarn, and then evenly applies the dye solution (a solution containing dyes and chemical additives) to the cotton yarn through a pump, or the cotton yarn is immersed in the dye solution for dyeing. After dyeing, the cotton yarn is sent to a closed steam chamber. The high-temperature steam directly acts on the yarn surface, accelerating the diffusion and fixation process of the dye molecules into the fiber.

[0004] In actual use of the prior art, cotton yarn needs to be immersed in dye solution for a long time to ensure the dyeing effect, which requires a lot of time waiting, and needs to be taken out separately for fumigation after dyeing, which is time-consuming and inefficient. Therefore, in view of the above technical problems, it is necessary to provide a steam-type cotton yarn processing dyeing device. Summary of the invention

[0005] The object of the present invention is to provide a steam-type cotton yarn processing dyeing device to solve the above-mentioned problems.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0007] A steam-type dyeing device for cotton yarn processing comprises a dyeing box, a conductor roller 1, a steam pipe and a suction pipe, wherein the lower surface of the dyeing box is fixedly connected to a support leg, the conductor roller 1 is located inside the dyeing box, the inner cavity of the dyeing box is rotatably connected to the conductor roller 2, the inner cavity of the dyeing box is rotatably connected to the conductor roller 3, the outer surfaces of the conductor rollers 1, 2 and 3 are sleeved with cotton yarn, the steam pipe is located inside the dyeing box, the inner cavity of the steam pipe is provided with a lower outlet, the inner cavity of the steam pipe is provided with an upper outlet, one side of the dyeing box is connected to a steam delivery pipe, one end of the steam delivery pipe is connected to two branch pipes, the inner cavity of the dyeing box is symmetrically fixedly connected to two air guide plates, the suction pipe is located between the dyeing box and the steam delivery pipe, and one end of the suction pipe is connected to an atomizing nozzle.

[0008] As a further improvement of the present invention, a cotton yarn inlet is provided on one side of the dyeing box, and a cotton yarn outlet is provided on one side of the dyeing box, the cotton yarn inlet is located below the cotton yarn outlet, the cotton yarn enters from the cotton yarn inlet, surrounds the outer surfaces of the first, second and third wire rollers and comes out from the cotton yarn outlet, the cotton yarn is in an inverted triangle shape in the dyeing box, and is used to place the cotton yarn and perform dyeing treatment through the internal space of the dyeing box, the cotton yarn inlet and the cotton yarn outlet are respectively used for the cotton yarn to enter and exit the dyeing box, to ensure continuous operation.

[0009] As a further improvement of the present invention, one end of the wire roller one passes through the dyeing box and is fixedly connected to gear one, one end of the wire roller two passes through the dyeing box and is fixedly connected to a transmission sprocket one, and one end of the wire roller three passes through the dyeing box and is fixedly connected to gear two. Wire roller one, wire roller two and wire roller three are responsible for guiding the cotton yarn to move along a predetermined path in the dyeing box to ensure uniform dyeing.

[0010] As a further improvement of the present invention, gear one and gear two are meshingly connected, one side of gear one is fixedly connected to a transmission sprocket two through an axis, and a transmission chain is sleeved on the outer surfaces of the transmission sprocket one and the transmission sprocket two. A transmission system is formed by gear one and gear two in conjunction with the transmission sprocket one, the transmission sprocket two and the transmission chain to control the moving speed of the cotton yarn.

[0011] As a further improvement of the present invention, a motor is fixedly connected to one side of the dyeing box, and the output shaft end of the motor passes through the dyeing box and is fixedly connected to the wire roller three. The motor drives the wire roller three to rotate as an active source to drive the entire device to operate.

[0012] As a further improvement of the present invention, a pump is provided in the inner cavity of the steam pipe, the branch pipe is away from one end of the steam delivery pipe and passes through the dyeing box to be connected with the steam pipe, the air guide plate is L-shaped, the long side of the air guide plate is arranged obliquely downward, and the short side of the air guide plate is arranged obliquely upward, and the pump is responsible for transporting the steam into the dyeing box through the steam delivery pipe, and the air guide plate can guide the steam to flow along a specified path.

[0013] As a further improvement of the present invention, the wire roller one is rotatably connected to the dyeing box, and the wire roller one and the wire roller two are symmetrically arranged inside the dyeing box. The cotton yarn is guided to move along a specified path by the symmetrically arranged wire roller one and the wire roller two.

[0014] As a further improvement of the present invention, the outer surfaces of the steam delivery pipe and the branch pipe are wrapped with an insulation layer, and the bottom of the inner cavity of the dyeing box is provided with an electric heating rod. The steam delivery pipe and the branch pipe are insulated by the insulation layer to reduce heat loss.

[0015] As a further improvement of the present invention, the steam pipe is connected to the dyeing box, and the suction pipe is connected to the dyeing box. The dye liquid in the dyeing box is pumped by the suction pipe, and the steam in the dyeing box is transported through the steam pipe.

[0016] As a further improvement of the present invention, the atomizing nozzle is embedded in the inner cavity of the steam delivery pipe, and a second pump is provided in the inner cavity at one end of the suction pipe. The second pump pumps the dye liquid to move in the suction pipe and refines the dye liquid into mist particles through the atomizing nozzle.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] (1) In this scheme, the motor drives the guide roller three to rotate clockwise to drive the cotton yarn to be automatically transported inward, and the guide rollers two and three rotate counterclockwise to drive the cotton yarn to be automatically transported outward, thereby realizing automatic loading and unloading of cotton yarn during dyeing. During transportation, the cotton yarn is dyed in contact with the dye liquid at the bottom of the dyeing box that is heated by the electric heating rod. The dye molecules of the heated dye liquid can diffuse and penetrate into the cotton fiber faster, thereby accelerating the dyeing rate, improving the dyeing uniformity, and enhancing the dyeing fastness.

[0019] (2) In this scheme, the high-temperature steam generated by heating the dye liquid in the dyeing box is extracted by pump 1 and transported to the steam pipe through the steam conveying pipe and the branch pipe, and then sprayed out through the upper outlet and the lower outlet respectively. At the same time, pump 2 is started to extract the dye liquid in the dyeing box through the suction pipe and drive the dye liquid through the spray hole through the atomizing nozzle to form a mist, and then spray it into the steam conveying pipe. At this time, the high-temperature steam carries the atomized dye liquid particles together, and under the action of the air guide plate, the high-temperature steam carrying the dye liquid particles sprayed out of the lower outlet is guided to blow directly toward the cotton yarn. The high-temperature and high-pressure steam is used to accelerate the penetration and diffusion of the dye liquid molecules into the fabric fibers, thereby enhancing the dyeing effect. The high-temperature steam carrying the dye liquid particles sprayed out of the upper outlet will blow along the air guide plate toward the already dyed cotton yarn for fumigation. The steam will pass through the cotton yarn to cause the dye liquid molecules to migrate from the fiber surface to the inside, perform color fixation on the cotton yarn, and improve the uniformity and consistency of dyeing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a side view schematic diagram of the overall structure of the present invention;

[0022] Figure 3 A half-section schematic diagram of the internal structure of the present invention;

[0023] Figure 4 It is a side-section schematic diagram of the internal structure of the present invention;

[0024] Figure 5For the present invention Figure 4 -A is an enlarged schematic diagram of the structure.

[0025] Description of the numbers in the figure:

[0026] 1. Dyeing box; 101. Support legs; 102. Cotton yarn inlet; 103. Cotton yarn outlet; 2. Wire roller one; 201. Wire roller two; 202. Wire roller three; 203. Drive sprocket one; 204. Gear one; 205. Gear two; 206. Drive sprocket two; 207. Drive chain; 208. Motor; 209. Cotton yarn; 3. Steam pipe; 301. Lower outlet; 302. Upper outlet; 303. Air guide plate; 304. Steam delivery pipe; 305. Pump one; 306. Insulation layer; 307. Branch pipe; 308. Electric heating rod; 4. Pumping pipe; 401. Pump two; 402. Atomizing nozzle. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0028] Embodiment 1:

[0029] See also Figure 1-2 A steam-type cotton yarn processing dyeing device comprises a dyeing box 1, a wire roller 2, a steam pipe 3 and a suction pipe 4, and the lower surface of the dyeing box 1 is fixedly connected with a supporting leg 101;

[0030] Specifically, a cotton yarn inlet 102 is opened on one side of the dyeing box 1, and a cotton yarn outlet 103 is opened on one side of the dyeing box 1. The cotton yarn inlet 102 is located below the cotton yarn outlet 103. The cotton yarn 209 enters from the cotton yarn inlet 102, surrounds the outer surfaces of the wire roller 1 2, the wire roller 2 201 and the wire roller 3 202, and comes out from the cotton yarn outlet 103. The cotton yarn 209 is in an inverted triangle shape in the dyeing box 1;

[0031] Furthermore, the dyeing box 1 is the main structure, the internal space is used to place cotton yarn and dye it, the support legs 101 are used to support the entire dyeing device to ensure stability, the cotton yarn inlet 102 and the cotton yarn outlet 103 are respectively used for the cotton yarn to enter and exit the dyeing box to ensure continuous operation.

[0032] Embodiment 2:

[0033] See also Figure 1-4, the conductor roller 1 2 is located inside the dyeing box 1, the inner cavity of the dyeing box 1 is rotatably connected to the conductor roller 2 201, the inner cavity of the dyeing box 1 is rotatably connected to the conductor roller 3 202, and the outer surfaces of the conductor roller 1 2, the conductor roller 201 and the conductor roller 3 202 are covered with cotton yarn 209;

[0034] Specifically, one end of the wire roller 2 passes through the dyeing box 1 and is fixedly connected to a gear 204, one end of the wire roller 201 passes through the dyeing box 1 and is fixedly connected to a transmission sprocket 203, one end of the wire roller 3 202 passes through the dyeing box 1 and is fixedly connected to a gear 205, the gear 204 and the gear 2 205 are meshed and connected, one side of the gear 204 is fixedly connected to a transmission sprocket 206 through an axis, and the outer surfaces of the transmission sprocket 1 203 and the transmission sprocket 2 206 are sleeved with a transmission chain 207, one side of the dyeing box 1 is fixedly connected to a motor 208, the output shaft end of the motor 208 passes through the dyeing box 1 and is fixedly connected to the wire roller 3 202, the wire roller 2 is rotatably connected to the dyeing box 1, and the wire roller 2 and the wire roller 2 201 are symmetrically arranged inside the dyeing box 1;

[0035] Furthermore, the wire roller 1 2, the wire roller 2 201 and the wire roller 3 202 are responsible for guiding the cotton yarn 209 to move along a predetermined inverted triangle path in the dyeing box 1 to ensure uniform dyeing. At the same time, the motor 208 is started to drive the wire roller 3 202 to rotate clockwise to drive the cotton yarn 209 to be automatically transported inward, and the wire roller 2 201 is driven to rotate counterclockwise through the cooperation of the meshing gear 205 and the gear 1 204. The wire roller 201, with the cooperation of the transmission sprocket 1 203, the transmission sprocket 2 206 and the transmission chain 207, synchronously drives the wire roller 3 202 to rotate counterclockwise to drive the cotton yarn 209 to be automatically transported outward to form a transmission system to control the movement speed of the cotton yarn.

[0036] Embodiment 3:

[0037] See also Figure 1-4 The steam pipe 3 is located inside the dyeing box 1, and the inner cavity of the steam pipe 3 is provided with a lower outlet 301, and the inner cavity of the steam pipe 3 is provided with an upper outlet 302. One side of the dyeing box 1 is connected with a steam delivery pipe 304, and one end of the steam delivery pipe 304 is connected with two branch pipes 307. The inner cavity of the dyeing box 1 is symmetrically fixedly connected with two air guide plates 303;

[0038] Specifically, a pump 305 is provided in the inner cavity of the steam pipe 3, a branch pipe 307 is far away from one end of the steam delivery pipe 304 and penetrates the dyeing box 1 and is connected with the steam pipe 3, the outer surfaces of the steam delivery pipe 304 and the branch pipe 307 are wrapped with a heat preservation layer 306, an electric heating rod 308 is provided at the bottom of the inner cavity of the dyeing box 1, the steam pipe 3 is connected with the dyeing box 1, and the air guide plate 303 is L-shaped, the long side of the air guide plate 303 is obliquely arranged downward, and the short side of the air guide plate 303 is obliquely arranged upward;

[0039] Furthermore, the electric heating rod 309 heats the dye solution to provide the high-temperature steam required for dyeing. The electric heating rod 309 can be powered by its own power supply. The specific startup method can be controlled by wireless signals, which is specifically selected by technical personnel in this field according to actual conditions. The steam delivery pipe 304 is responsible for delivering steam from the steam to the dyeing box 1 under the action of the pump 305, and reduces heat loss through the insulation layer 306 to improve energy utilization. The high-temperature steam is output through the lower outlet 301 and the upper outlet 302 through the branch pipe 307 to form a circulating steam environment. The air guide plate 303 guides the high-temperature steam mixed with dye solution particles sprayed from the lower outlet 301 to blow directly to the cotton yarn 209, and the two streams of high-temperature steam will be on the cotton yarn Convection is formed above the yarn 209 and they are fully mixed together. The high-temperature steam will blow the cotton yarn and the dye particles to cause shaking and dynamic mixing, further strengthening the contact and exchange between the dye and the yarn, and using high-temperature and high-pressure steam to accelerate the penetration and diffusion of dye molecules into the fabric fibers. The dye will be activated by the high temperature and humidity generated by the steam and more effectively combine with the cotton yarn, thereby enhancing the dyeing effect. The high-temperature steam mixed with dye particles sprayed out from the upper outlet 302 will be blown along the air guide plate 303 toward the dyed cotton yarn 209 for fumigation. The steam will pass through the cotton yarn to prompt the dye molecules to migrate from the fiber surface to the inside, perform color fixation on the cotton yarn 209, and improve the uniformity and consistency of dyeing.

[0040] Embodiment 4:

[0041] See also Figure 1-5 The extraction pipe 4 is located between the dyeing box 1 and the steam delivery pipe 304, and one end of the extraction pipe 4 is connected to an atomizing nozzle 402;

[0042] Specifically, the steam pipe 3 is connected to the dyeing box 1, the atomizing nozzle 402 is embedded in the inner cavity of the steam delivery pipe 304, and a second pump 401 is provided in the inner cavity of one end of the pumping pipe 4;

[0043] Furthermore, the dye liquid is extracted by the pump 2 401 and atomized by the atomizing nozzle 402 and then directly sprayed into the steam delivery pipe 304. The dye liquid particles refined by the atomizing nozzle 402 become smaller and can be carried by the high-temperature steam. The high-temperature steam and the dye liquid particles are transported together to the periphery of the cotton yarn, thereby increasing the permeability and distribution uniformity of the dye liquid.

[0044] Working principle: During the use of the device, the operator brings the cotton yarn 209 to be dyed into the dyeing box 1 through the cotton yarn inlet 102 and winds it around the outer surfaces of the wire roller 1 2, the wire roller 2 201 and the wire roller 3 202. The cotton yarn entering the dyeing box 1 will fall and be released from the dyeing liquid at the bottom of the dyeing box 1. At this time, the starting motor 208 drives the wire roller 3 202 to rotate clockwise to drive the cotton yarn 209 to be automatically transported inward, and drives the wire roller 2 201 to rotate counterclockwise through the cooperation of the gear 2 205 and the gear 1 204. The wire roller 201 drives the wire roller 3 202 to rotate counterclockwise in the cooperation of the transmission sprocket 1 203, the transmission sprocket 2 206 and the transmission chain 207, and drives the cotton yarn 209 to be automatically transported outward, thereby realizing the automatic loading and unloading of the cotton yarn 209. The cotton yarn 209 contacts the dyeing liquid at the bottom of the dyeing box 1 during transportation for dyeing.

[0045] At the same time, the operator starts the electric heating rod 309 to heat the dye liquid at the bottom of the inner cavity of the dye box 1. The dye molecules of the heated dye liquid can diffuse and penetrate into the cotton fiber faster, thereby accelerating the dyeing rate, improving the dyeing uniformity, and enhancing the dyeing fastness. When the dye liquid is heated at high temperature, the water temperature will reach above the boiling point (the dye liquid can be used normally at high temperature), thereby generating high-temperature steam. At this time, the pump 305 is started to extract the high-temperature steam in the dye box 1 and transport it to the steam pipe 3 through the steam delivery pipe 304 and the branch pipe 307, and spray it out through the upper outlet 302 and the lower outlet 301 respectively;

[0046] Then, the second pump 401 is started to extract the dyeing liquid in the dyeing box 1 through the suction pipe 4 and drive the dyeing liquid through the spray hole through the atomizing nozzle 402 to form a mist, which is then sprayed into the steam delivery pipe 304. The atomized dyeing liquid particles are transported together by the high-temperature steam. At this time, under the action of the air guide plate 303, the high-temperature steam mixed with the dyeing liquid particles sprayed through the lower outlet 301 will blow directly toward the cotton yarn 209. The two streams of high-temperature steam will form convection above the cotton yarn 209 and be fully mixed together. The high-temperature steam will blow the cotton yarn and the dyeing liquid particles to cause shaking, and perform dynamic mixing, further strengthening the contact and exchange between the dyeing liquid and the yarn, and utilizing the high-temperature and high-pressure steam to accelerate the penetration and diffusion of the dyeing liquid molecules into the fabric fibers. The dyeing liquid will be activated by the high temperature and humidity generated by the steam and more effectively combined with the cotton yarn, thereby enhancing the dyeing effect.

[0047] The high-temperature steam mixed with dye particles sprayed out through the upper outlet 302 will be blown along the air guide plate 303 toward the dyed cotton yarn 209 for fumigation. The steam will pass through the cotton yarn to promote the migration of dye molecules from the fiber surface to the inside, fix the color of the cotton yarn 209, and improve the uniformity and consistency of dyeing.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that those skilled in the art can understand.

Claims

1. A steam-type cotton yarn processing dyeing device, characterized in that: include: A dyeing box (1), wherein the lower surface of the dyeing box (1) is fixedly connected to support legs (101); A conductor roller one (2), the conductor roller one (2) being located inside a dyeing box (1), the inner cavity of the dyeing box (1) being rotatably connected to a conductor roller two (201), the inner cavity of the dyeing box (1) being rotatably connected to a conductor roller three (202), the outer surfaces of the conductor roller one (2), the conductor roller two (201) and the conductor roller three (202) being sheathed with cotton yarn (209); A steam pipe (3), the steam pipe (3) being located inside the dyeing box (1), the inner cavity of the steam pipe (3) being provided with a lower outlet (301), the inner cavity of the steam pipe (3) being provided with an upper outlet (302), one side of the dyeing box (1) being connected to a steam delivery pipe (304), one end of the steam delivery pipe (304) being connected to two branch pipes (307), and the inner cavity of the dyeing box (1) being symmetrically fixedly connected to two air guide plates (303); A suction pipe (4), the suction pipe (4) being located between the dyeing box (1) and the steam delivery pipe (304), and one end of the suction pipe (4) being connected to an atomizing nozzle (402); The inner cavity of the steam pipe (3) is provided with a pump (305); the branch pipe (307) is remote from the end of the steam delivery pipe (304) and penetrates the dyeing box (1) to be connected with the steam pipe (3); the air guide plate (303) is L-shaped, the long side of the air guide plate (303) is arranged obliquely downward, and the short side of the air guide plate (303) is arranged obliquely upward; The steam pipe (3) is connected to the dyeing box (1), and the suction pipe (4) is connected to the dyeing box (1); The atomizing nozzle (402) is embedded in the inner cavity of the steam delivery pipe (304), and a second pump (401) is provided in the inner cavity at one end of the pumping pipe (4).

2. A steam-type cotton yarn processing dyeing device according to claim 1, characterized in that: A cotton yarn inlet (102) is provided on one side of the dyeing box (1), and a cotton yarn outlet (103) is provided on one side of the dyeing box (1); the cotton yarn inlet (102) is located below the cotton yarn outlet (103); the cotton yarn (209) enters from the cotton yarn inlet (102), surrounds the outer surfaces of the first conductor roller (2), the second conductor roller (201) and the third conductor roller (202), and exits from the cotton yarn outlet (103); the cotton yarn (209) is in the shape of an inverted triangle in the dyeing box (1).

3. A steam-type cotton yarn processing dyeing device according to claim 1, characterized in that: One end of the wire roller 1 (2) passes through the dyeing box (1) and is fixedly connected to a gear 1 (204); one end of the wire roller 2 (201) passes through the dyeing box (1) and is fixedly connected to a transmission sprocket 1 (203); and one end of the wire roller 3 (202) passes through the dyeing box (1) and is fixedly connected to a gear 2 (205).

4. A steam-type cotton yarn processing dyeing device according to claim 3, characterized in that: The gear one (204) and the gear two (205) are meshingly connected, one side of the gear one (204) is fixedly connected to a transmission sprocket two (206) via a shaft, and the outer surfaces of the transmission sprocket one (203) and the transmission sprocket two (206) are sleeved with a transmission chain (207).

5. The steam-type cotton yarn processing dyeing device according to claim 1, characterized in that: A motor (208) is fixedly connected to one side of the dyeing box (1), and an output shaft end of the motor (208) passes through the dyeing box (1) and is fixedly connected to the conductor roller three (202).

6. A steam-type cotton yarn processing dyeing device according to claim 1, characterized in that: The conductor roller one (2) is rotatably connected to the dyeing box (1), and the conductor roller one (2) and the conductor roller two (201) are symmetrically arranged inside the dyeing box (1).

7. A steam-type cotton yarn processing dyeing device according to claim 1, characterized in that: The outer surfaces of the steam delivery pipe (304) and the branch pipe (307) are both wrapped with a heat-insulating layer (306), and the bottom of the inner cavity of the dyeing box (1) is provided with an electric heating rod (308).

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