Multilayer dye box and dyeing device for supercritical waterless dyeing

Abstract

The invention relates to a multilayer dye box and a dyeing device for supercritical waterless dyeing, the dye box comprises a dye box body and a dye box inner cylinder, the dye box inner cylinder is arranged in the dye box body, the dye box inner cylinder comprises a plurality of cylinder sections, the cylinder sections are mutually matched in structure and can be detachably connected, and the dye box inner cylinder is arranged in the dye box body. An independent dye containing space is arranged in each shell ring, a circulation bottom plate is arranged on each shell ring and used for dividing the adjacent dye containing spaces, circulation holes used for circulation of supercritical gas are formed in the circulation bottom plates, a gas inlet is formed in the dye box body, one end of the gas inlet is connected with the supercritical gas, and the other end of the gas inlet is connected with the supercritical gas. And the other end of the cylinder section is positioned in the dye box inner cylinder and is used for guiding dye supercritical gas into the cylinder section. The problem that a large amount of undissolved dye is accumulated in the dyeing box and blocks the filter screen after carbonization is effectively avoided, and the problem of low-efficiency dyeing caused by dye accumulation is solved.

Description

Technical Field

[0001] The invention belongs to the field of supercritical waterless dyeing, and in particular relates to a multi-layer dye box and a dyeing device for supercritical waterless dyeing. Background Art

[0002] As a green and environmentally friendly dyeing method, supercritical waterless dyeing has a bright future in the textile dyeing and finishing industry and is gradually entering the stage of industrial production. In the industrialization process, the supercritical waterless dyeing fluid in the dyeing device needs to be in a supercritical state of high temperature and high pressure. Therefore, the dyeing environment has high design and process requirements for the dyeing device. The dye box is a storage device for the dye entering the dyeing system. Its design and installation must meet the needs of the dyeing process to achieve the desired dyeing effect on the fabric.

[0003] During the operation of the supercritical dyeing device, the dye in the dye box is easily stacked into blocks under the action of high-pressure fluid pressure. Combined with the high-temperature production environment, the agglomerated dye is easily carbonized under high-temperature conditions. The carbonization products will clog the filter at the air outlet of the dye box, causing a high pressure difference in the dye box, affecting the quality of dyeing.

[0004] Compared with the total volume of the dye box, the contact area between the dye and the dye box is very small, and the space utilization rate is low, resulting in limited contact between the dye and the supercritical fluid. The dye cannot be completely dissolved in the supercritical fluid, and the dye remains in the dye box. The dye box needs to be cleaned before color change and dyeing can be performed, which reduces the process production efficiency.

[0005] Therefore, most of the current supercritical waterless dyeing devices have problems such as low space utilization of the dye box and unsatisfactory dyeing effect. It is necessary to optimize the internal structure of the dye box and rationally plan the effective space in the dye box to meet customers' product needs. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention designs a multi-layer dye box for supercritical waterless dyeing, which can at least solve one of the following problems: reduce insufficient space utilization of the dye box, accumulation of dyes into blocks, and thus carbide clogging of the filter.

[0007] The present invention is achieved through the following technical solutions:

[0008] In the first aspect, the present invention provides a multilayer dye box for supercritical waterless dyeing, comprising a dye box body and a dye box inner cylinder, wherein the dye box inner cylinder is arranged inside the dye box body, and the dye box inner cylinder comprises a plurality of cylinder sections, and the cylinder section structures match each other and can be detachably connected, each cylinder section contains an independent dye accommodating space, and a flow bottom plate is provided on the cylinder section, and the flow bottom plate is used to divide adjacent dye accommodating spaces, and the flow bottom plate is provided with flow holes for supercritical gas circulation, and the dye box body is provided with an air inlet, one end of the air inlet is connected to the supercritical gas, and the other end is located in the dye box inner cylinder, and is used to introduce the dye supercritical gas into the cylinder section.

[0009] According to an embodiment of the present invention, the connection method between the cylinder segments is set according to actual needs, for example, connected by bolts, buckles, etc.

[0010] According to an embodiment of the present invention, the height of the barrel section is 40 to 100 mm, and preferably the height of the barrel section is 50 to 80 mm.

[0011] According to an embodiment of the present invention, the number of the cylinder segments is less than or equal to 5, for example, 2, 3, 4, or 5. According to an embodiment of the present invention, the cylinder segment comprises a connecting outer wall and a flow bottom plate, and the flow bottom plate is arranged at the bottom of the connecting outer wall.

[0012] As an example, the connecting outer wall is cylindrical, the flow bottom plate protrudes from the bottom of the connecting outer wall, and the flow bottom plate can be inserted into the lower cylinder section, adjacent connecting outer walls are connected by bolts, and the flow bottom plate can be clamped with the connecting outer wall of the lower cylinder section.

[0013] As another example, the connecting outer wall is cylindrical, the bottom of the flow bottom plate is flush with the bottom of the connecting outer wall or located inside the connecting outer wall, and adjacent barrel sections are rotationally connected or pull-type connected. When the dye box is in a working state, there is no relative movement between adjacent barrel sections; when the dye box is in a non-working state, adjacent barrel sections can rotate or be pulled relative to each other.

[0014] According to the embodiment of the present invention, the number and size of the flow holes are not particularly limited and can be set according to actual needs.

[0015] According to an implementation plan of the present invention, the air inlet is located at the upper end of the inner cylinder of the dye box, and the distance between the air inlet and the top of the inner cylinder is 30 to 70 mm, preferably the distance between the air inlet and the top of the inner cylinder is 40 to 50 mm; the distance between the air inlet and the bottom plate of the lowest cylinder throttling flow is 200 to 600 nm, for example, 350 mm, 400 mm, 450 nm, 500 nm, to ensure that the supercritical fluid flows through the inner cylinder of the dye box from top to bottom, thereby dissolving and carrying the dye into the dyeing kettle.

[0016] According to an embodiment of the present invention, the portion where the connecting outer wall contacts the dye is coated with a non-stick coating to prevent the dye from adhering to the wall.

[0017] According to an implementation scheme of the present invention, the inner cylinder of the dye box is formed by overlapping multiple layers of cylinder segments, and the cylinder segments with a certain height are fixed by screws. The strength and toughness of the formed connector meet the requirements for use under specified process conditions. The number of cylinder segments is determined by comprehensive factors such as the volume of the dye box and the amount of feed. The maximum number of segments is designed as much as possible while ensuring safety in use, thereby improving the space utilization rate of the dye box.

[0018] According to an embodiment of the present invention, a filter plate is arranged on the top of the circulation bottom plate, and a filter net is arranged between the circulation bottom plate and the filter plate.

[0019] According to an embodiment of the present invention, an inner cylinder sealing top cover is provided on the top of the cylinder section located at the top.

[0020] According to an embodiment of the present invention, an inner cylinder handle is provided on the top of the inner cylinder sealing top cover.

[0021] According to an embodiment of the present invention, the inner cylinder sealing top cover is fixed to the inner cylinder by screws, and a polyurethane sealing ring is installed at the connection between the inner cylinder sealing top cover and the cylinder body, which is used to seal the gap between the inner wall of the dye box and the inner cylinder, and can effectively isolate the supercritical carbon dioxide fluid from flowing through the gap without passing through the inner cylinder to carry the dye.

[0022] According to an embodiment of the present invention, the inner cylinder sealing top cover is provided with a fixing thread of the inner cylinder handle for fixing the inner cylinder handle.

[0023] According to an embodiment of the present invention, a placement hole is provided on the connecting outer wall, and the placement hole is used to place a cylinder segment moving tool. The moving tool is for facilitating the placement of the dye box into the color matching kettle. The color matching kettle is installed vertically. The dye box has a certain weight, and a tool is needed to lift the dye box and place it into the color matching kettle at a certain height.

[0024] According to an embodiment of the present invention, the dye box body comprises a hollow shell, the air inlet is arranged on the upper part of the outer side of the shell, an air outlet is opened on the lower part, the dye box inner tube is located inside the shell, and the air outlet is located below the dye box inner tube. According to an embodiment of the present invention, the shell comprises an outer shell and an inner shell, a heat preservation layer is arranged between the outer shell and the inner shell, the inner side of the inner shell is in close contact with the dye box inner tube, and the outer side is in contact with the heat preservation layer.

[0025] According to an embodiment of the present invention, a bucket-shaped air outlet is provided below the inner shell, which can effectively improve the problem of dye accumulation in the straight-tube dye box.

[0026] According to an embodiment of the present invention, a box cover is provided on the top of the dye box body, and the box cover is used to seal the top of the dye box inner cylinder in the dye box body.

[0027] According to an embodiment of the present invention, a sealing gasket is provided at the connection between the upper part of the dye box body and the box cover to ensure the sealing of the top of the dye box.

[0028] According to an implementation scheme of the present invention, the box cover is a quick-opening door clamp structure, and a starting handle is provided on the box cover. The starting handle is connected to the automatic control system, and the center of the starting handle is connected to the main screw rod, and there are three auxiliary screw rods to assist in closing the box cover. The pneumatic switch controls the opening and closing of the outer clamp of the box cover. When the quick-opening door clamp reaches the specified position, the safety interlocking device can be further used to lock it.

[0029] According to an embodiment of the present invention, a certain number of holes with a certain pore size are evenly distributed on the filter plate, and preferably the outer surface of the filter plate is coated with a non-stick coating to prevent the dye from sticking and accumulating.

[0030] According to an embodiment of the present invention, the filter plate is made of non-metallic material suitable for supercritical dyeing process conditions, such as Teflon.

[0031] According to an embodiment of the present invention, the distance between the filter plate and the flow bottom plate is 50-70 mm, ensuring that the thickness of the dye on each filter plate will not be blocked or carbonized under high pressure.

[0032] According to an embodiment of the present invention, the pore size of the filter needs to ensure that the dye particles dissolved in the supercritical carbon dioxide can pass through, and the undissolved dye cannot pass through the pores of the filter under supercritical process pressure conditions. Preferably, the mesh size of the filter is 600-1500 mesh. At the same time, at normal temperature and pressure, dissolved or undissolved dye particles cannot pass through the filter of this mesh size, which can improve the accuracy of product dyeing.

[0033] According to an embodiment of the present invention, the filter screen is made of 304 stainless steel screen.

[0034] In a second aspect, the present invention provides a supercritical dyeing device, comprising a dyeing kettle, wherein the dye box as described above is arranged in the dyeing kettle, and an air outlet of the dye box is connected to the dyeing kettle.

[0035] According to an embodiment of the present invention, the dyeing kettle is a vertical structure or a horizontal structure, for example, a horizontal structure.

[0036] According to the implementation scheme of the present invention, the inner cylinder of the dye box inside the dye box can play the role of placing the dye in layers. The fluid enters from the air inlet and passes through each cylinder section layer by layer. The supercritical fluid will contact the dye in each layer of the cylinder section. Under the action of high temperature and high pressure, the large molecular weight dye is fragmented, and the dye will dissolve and semi-dissolve in the supercritical fluid. The supercritical fluid carries the dissolved dye out of the dye box and into the dyeing kettle. The dyeing kettle is placed with a dyeing bracket wrapped with cloth. The dye in the dye bath is trapped in the dyeing kettle. Driven by the circulation of the supercritical fluid, the dye adheres to the fiber surface of the cloth and is further fixed inside the fiber. The dynamic process of the dye entering and exiting the fiber gradually reaches equilibrium, which can achieve rapid exhaustion of the dye on the cloth.

[0037] According to the embodiment of the present invention, the dye distributed in the dye box is dissolved in supercritical carbon dioxide, and its solubility is related to the dye itself and the process conditions. At the process temperature T1 and the process pressure P1, the flow rate of carbon dioxide circulation is Q1, the density of carbon dioxide is ρ1, and the relative molecular mass of carbon dioxide is M1. During the cycle T1, the volume of carbon dioxide flowing through the dye box is V1=Q 1× T1, the solubility of a disperse dye at temperature T1 and pressure P1 is y1, and the relative molecular mass is M2. It can be known that the maximum amount of dye added under this condition When the amount of dye added Y2 exceeds Y1, theoretically, some dye Y3=Y2-Y1 will remain in the dye box, which is insoluble in supercritical carbon dioxide. For the single-layer internal structure of the traditional dye box, the actual amount of dye dissolved during dyeing will be far lower than the theoretical calculated amount due to the accumulation of dye during dyeing. The design of the multi-layer dye box will make great use of the internal space of the dye box, and the amount of dye dissolved will be very close to the theoretical amount, ensuring that the quality of the dyed product meets customer requirements.

[0038] Beneficial Effects

[0039] 1) The dye box of the present invention realizes dye distribution through layered design, can quantitatively analyze the dissolution of dye on each layer of filter plate, achieve the effect of accurate feeding, and effectively reduce the accumulation and agglomeration of dye in the bottom layer, can realize artificial distribution of dye, and efficiently utilize the internal space of the dye box, greatly improve the contact area between dye and fluid, and the dye can be effectively dissolved in the supercritical fluid and enter the dyeing kettle, avoiding the problem of low solubility caused by the difficulty of dye contacting with the supercritical fluid, thereby effectively avoiding a large amount of undissolved dye from accumulating in the dyeing box and clogging the filter screen after carbonization, reducing the problem of inefficient dyeing due to dye accumulation, and at the same time, it can also effectively reduce the amount of dye residue in the dyeing box. When the dye is the same color, the dye box does not need to be cleaned, and dyeing can be carried out after adding the dye, thereby improving production efficiency.

[0040] 2) The dye box of the present invention is provided with multiple layers of cylinder sections, and the number of layers can be reasonably controlled by the amount of feed and the amount of product. Through simulation analysis, it is ensured as much as possible that the thickness of the dye layer on each filter plate is roughly the same after the high-pressure fluid passes through, and the diameter and number of the filter holes of the selected filter are also the optimal number, which can not only ensure the maximum cross-sectional area of ​​the fluid flow, but also ensure that the pressure difference between the inlet and outlet of the dye box is at a reasonable value. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of a multi-layer dye box used for supercritical waterless dyeing in the present invention;

[0042] Figure 2 It is a cross-sectional view of the inner cylinder of the multilayer dye box used for supercritical waterless dyeing in the present invention.

[0043] In the figure: 1 is the dye box body, 2 is the dye box inner cylinder, 3 is the cylinder section, 31 is the connecting outer wall, 32 is the flow bottom plate, 33 is the flow hole, 34 is the filter plate, 35 is the filter screen, 4 is the starting handle, 5 is the air inlet, 6 is the inner cylinder sealing top cover, 7 is the shell, 71 is the outer shell, 72 is the inner shell, 73 is the insulation layer, 8 is the air outlet, and 9 is the box cover. DETAILED DESCRIPTION

[0044] The structure of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present invention, and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0045] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Example 1

[0048] A multilayer dye box for supercritical waterless dyeing comprises a dye box body 1 and a dye box inner cylinder 2. The dye box inner cylinder 2 is arranged inside the dye box body 1. The dye box inner cylinder 2 comprises a plurality of cylinder sections 3. The cylinder sections 3 have matching structures and can be assembled with each other. A space for accommodating dye is formed between adjacent cylinder sections 3. Channels for supercritical gas circulation are arranged on the cylinder sections 3. An air inlet 5 is arranged on the dye box body 1. One end of the air inlet 5 is connected to the supercritical gas, and the other end is located in the dye box inner cylinder 2. The air inlet 5 is used to introduce the dye supercritical gas into the cylinder section 3. The air inlet 5 is located at one end of the dye box inner cylinder 3 and is 400 mm away from the bottom of the corresponding cylinder section 3, so as to ensure that the supercritical fluid flows from top to bottom through the dye box inner cylinder, thereby dissolving and carrying the dye into the dyeing kettle. A non-stick coating is applied at the contact point between the wall of the dye box inner cylinder and the dye to prevent the dye from adhering to the wall.

[0049] The cylinder section 3 includes a connecting outer wall 31 and a circulation bottom plate 32. The structure of the circulation bottom plate 32 matches the connecting outer wall 31 and can be assembled with each other. For example, (structure A), the circulation bottom plate 32 protrudes from the bottom of the connecting outer wall 31, and the circulation bottom plate 32 can be inserted into the lower cylinder section 3. Adjacent connecting outer walls 31 are connected by bolts, and the circulation bottom plate 32 can be clamped with the connecting outer wall 31 of the lower cylinder section 3.

[0050] For another example (structure B), the connecting outer wall 31 is cylindrical, the bottom of the flow bottom plate 32 is flush with the bottom of the connecting outer wall 31 or is located inside the connecting outer wall 31, and the adjacent barrel segments 3 are rotationally connected or pull-type connected. When the dye box is in a working state, there is no relative movement between the adjacent barrel segments 3; when the dye box is in a non-working state, the adjacent barrel segments 3 can rotate or be pulled relative to each other.

[0051] A placement hole is provided on the connecting outer wall 31, and the placement hole is used to place the moving tool of the cylinder segment 3. A plurality of flow holes 33 (channels for the circulation of supercritical gas) are provided on the circulation bottom plate 32. The number and size of the flow holes 33 are set according to actual needs. Different cylinder segments 3 are fixedly connected or detachably connected, for example, by bolt connection. The height of the cylinder segment 3 is 70 mm (can be set to 40-100 mm according to actual needs), and the maximum number of cylinder segments 3 is 5 (can be 2, 3, 4 or 5).

[0052] A filter plate 34 is arranged on the top of the circulation bottom plate 32, a filter screen 35 is arranged between the circulation bottom plate 32 and the filter plate 34, an inner cylinder sealing top cover 6 is arranged on the top of the cylinder segment 3 located at the top, an inner cylinder handle is arranged on the top of the inner cylinder sealing top cover 6, and the inner cylinder sealing top cover 6 is fixed to the cylinder segment 3 by screws (the inner cylinders are stacked and connected, the uppermost layer is connected with the inner cylinder sealing top cover 6, the inner cylinder sealing top cover 6 has a connection port for the inner cylinder handle, and the handle can be rotatably connected and taken out), a polyurethane sealing ring is installed at the connection between the inner cylinder sealing top cover 6 and the cylinder segment 3, which is used to seal the gap between the inner wall of the dye box 1 and the cylinder segment 3, and can effectively isolate the supercritical carbon dioxide fluid from flowing through the gap without passing through the inner cylinder to carry the dye, and when the dye cylinder segment 3 is pulled, a fixing thread of the inner cylinder handle is arranged on the inner cylinder sealing top cover 6, which can be used to move the cylinder segment 3.

[0053] A certain number of holes with a certain aperture are evenly distributed on the filter plate 34. The outer surface of the filter plate 34 is coated with a non-stick coating to prevent the dye from sticking and accumulating. The filter plate 34 is made of non-metallic materials suitable for supercritical dyeing process conditions, such as Teflon.

[0054] The distance between the filter plate 34 and the flow bottom plate 32 is set according to actual needs to ensure that the thickness of the dye on each filter plate will not be blocked or carbonized under high pressure.

[0055] The pore size of the filter 35 must be guaranteed to be able to pass through the dye particles dissolved in the supercritical carbon dioxide, and the undissolved dye cannot pass through the pores of the filter 35 under the supercritical process pressure conditions. The preferred mesh size of the filter 35 is 600-1500 mesh. At the same time, at normal temperature and pressure, dissolved or undissolved dye particles cannot pass through the filter of this mesh size, which can improve the accuracy of product dyeing. The filter 35 uses a 304 stainless steel screen.

[0056] See also Figure 2 As shown, the circulation bottom plate 32 can be inserted into the connecting outer wall 31 to form a clamping structure. Bolts are provided on the top of the connecting outer wall 31 to lock the circulation bottom plate 32. Specifically, the inner cylinder 2 of the dye box is formed by overlapping multiple layers of cylinder sections 3. The cylinder sections 3 with a certain height are fixed by screws. The strength and toughness of the formed connection body meet the requirements for use under specified process conditions. The number of cylinder sections 3 is determined by comprehensive factors such as the volume of the dye box 1 and the amount of feed. The maximum number of sections is designed as much as possible while ensuring safety in use, so as to improve the space utilization rate of the dye box 1.

[0057] See also Figure 1As shown, the dye box body 1 includes a hollow shell 7, an air inlet 5 is provided on the upper outer side of the shell 7, and an air outlet 8 is opened on the lower part. The dye box inner tube 2 is located inside the shell 7, and the air outlet 8 is located below the dye box inner tube 2. The shell 7 includes an outer shell 71 and an inner shell 72, and an insulation layer 73 is provided between the outer shell 71 and the inner shell 72. The inner side of the inner shell 72 is in close contact with the dye box inner tube 2, and the outer side is in contact with the insulation layer 73. A bucket-shaped air outlet 8 is provided below the inner shell 72, which can effectively improve the problem of dye accumulation in the straight-cylinder dye box.

[0058] A box cover 9 is provided on the top of the dye box body 1, and the box cover 9 is used to seal the top of the dye box inner tube 2 in the dye box body 1. A sealing gasket is provided at the connection between the top of the dye box body 1 and the box cover 9 to ensure the sealing of the top of the dye box body 1. The box cover 9 is a quick-opening door clamp structure. A starting handle 4 is provided on the box cover 9, and the starting handle 4 is connected to the automatic control system. The center of the starting handle 4 is connected to the main screw rod, and there are three auxiliary screw rods to assist, which are used to close the box cover. The pneumatic switch controls the opening and closing of the outer clamp of the box cover. When the quick-opening door clamp reaches the specified position, the safety interlocking device can be further used to lock it.

[0059] In the multi-layer dye box used in the following Examples 2-4, the barrel section 3 is of the structure of mode A, the height of the barrel section 3 is 70 mm, the number of the barrel sections 3 is set according to specific needs, and the other structures are the same as those in Example 1.

[0060] Example 2

[0061] See also Figure 1 As shown, 1kg PET (Polyethylene terephthalate) cloth is wrapped on a bracket and placed in a dyeing kettle. The dye dosage is 0.2% owf. A dyeing box inner cylinder 2 with 3 layers of cylinder sections 3 is selected. A filter screen 35 with 800 mesh is used. 1g, 0.75g, and 0.25g of disperse blue 291 are placed on the filter plate 34 of each layer of cylinder section 3 in order from top to bottom. The inner cylinder sealing top cover 6 on the dye box inner cylinder 2 is fixed with the top cover bolts, and then the dye box inner cylinder 2 is installed into the dye box body 1, the box cover 9 is covered, the start handle 4 is rotated, and the auxiliary spiral rod cooperates with the main spiral rod to completely close the box cover 9. The outer clamp locking device of the box cover 9 controls the outer clamp of the box cover 9 to wrap the box cover 9. The dye box is filled with materials, and then the dyeing operation can be carried out.

[0062] At the beginning of dyeing, carbon dioxide is transported to the storage tank by the delivery pump. The carbon dioxide in the storage tank is heated by the heat exchanger and pressurized by the pressure pump. After reaching the stable pressure required by the process, the circulation pump is turned on for the dyeing cycle. The supercritical CO2 passes through the color matching kettle and carries the dye in the dye box into the dyeing kettle and dyes the fabric. During a certain insulation time, the dyeing process continues until the dyeing is completed.

[0063] After dyeing is finished, wait for the temperature of the dyeing system to drop to room temperature, and after the pressure drops to normal pressure, open the quick-opening safety interlocking device of the dye box, rotate the start handle 4, and the main screw rod and the auxiliary screw rod cooperate with each other to open the box cover 9, and take out the dye box inner cylinder 2. Disassemble the inner cylinder sealing top cover 6 of the dye box inner cylinder 2, remove the cylinder section 3 layer by layer and the filter plate 34 and filter screen 35 on each layer of the cylinder section 3, and then further clean the dye box inner cylinder 2.

[0064] Example 3

[0065] See also Figure 1 As shown, 1kg PET cloth is wrapped on a bracket and put into a dyeing kettle, and the dye dosage is 0.8% owf. A dyeing box inner cylinder 2 with 5 layers of cylinder sections 3 is selected, and a 1000-mesh filter screen 35 is used. 4g, 2g, 1g, 0.75g, and 0.25g of disperse blue 291 are placed on the filter plate 34 of each layer of cylinder section 3 in order from top to bottom. The inner cylinder sealing top cover 6 on the dye box inner cylinder 2 is fixed with the top cover bolts, and then the dye box inner cylinder 2 is installed into the dye box body 1, the box cover 9 is covered, and the start handle 4 is rotated. The auxiliary spiral rod cooperates with the main spiral rod to completely close the box cover 9, and the outer clamp locking device of the box cover 9 controls the outer clamp of the dye box cover to wrap the box cover 9. The dye box is filled with materials, and then the dyeing operation can be carried out.

[0066] At the beginning of dyeing, carbon dioxide is transported to the storage tank by the delivery pump. The carbon dioxide in the storage tank is heated by the heat exchanger and pressurized by the pressure pump. After reaching the stable pressure required by the process, the circulation pump is turned on for the dyeing cycle. The supercritical CO2 passes through the color matching kettle and carries the dye in the dye box into the dyeing kettle and dyes the fabric. During a certain insulation time, the dyeing process continues until the dyeing is completed.

[0067] After dyeing is finished, wait for the temperature of the dyeing system to drop to room temperature, and after the pressure drops to normal pressure, open the quick-opening safety interlocking device of the dye box, rotate the start handle 4, and the main screw rod and the auxiliary screw rod cooperate with each other to open the box cover 9, and take out the dye box inner cylinder 2. Disassemble the inner cylinder sealing top cover 6 of the dye box inner cylinder 2, remove the cylinder section 3 layer by layer and the filter plate 34 and filter screen 35 on each layer of the cylinder section 3, and then further clean the dye box inner cylinder 2.

[0068] Example 4

[0069] See also Figure 1As shown, 1 kg of PET cloth is wrapped on a bracket and put into a dyeing kettle with a feed amount of 0.8% owf, that is, 8 g of dye with a particle size of 3-4 mm is added to a single-layer dye box. After the dye box is filled, the dyeing cycle is carried out at a dyeing temperature of 90°C and a dyeing pressure of 23 MPa for 1 hour. After the dyeing is completed, 1.06 g of dye remains in the single-layer dye box.

[0070] Under the same dyeing state, a dye box with 4 layers of barrel segments is used (barrel segment 3 is the structure of method A, the height of barrel segment 3 is 70 mm, and other structures are the same as those in Example 1), and the dye is evenly distributed in each layer. Under the same feed ratio and process conditions, after the dyeing is completed, the residual dye in each barrel segment is significantly reduced, and the amount of dye gradually decreases from the lower layer to the upper layer. There is no residual dye in the top barrel segment, and the total amount of residual dye in the 4-layer dye box is 0.3g.

[0071] The above examples are used to illustrate the specific implementation of the present invention. However, the protection scope of the present invention is not limited to the above exemplary implementation. Any modification, equivalent substitution, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A multi-layer dye box for supercritical waterless dyeing, characterized in that: The dye box includes a dye box body and a dye box inner cylinder, the dye box inner cylinder is arranged inside the dye box body, the dye box inner cylinder includes a plurality of cylinder sections, the cylinder section structures match each other and can be detachably connected, each cylinder section has an independent dye accommodating space, a flow bottom plate is arranged on the cylinder section, the flow bottom plate is used to divide adjacent dye accommodating spaces, the flow bottom plate is provided with flow holes for supercritical gas circulation, the dye box body is provided with an air inlet, one end of the air inlet is connected to the supercritical gas, and the other end is located in the dye box inner cylinder, which is used to introduce the dye supercritical gas into the cylinder section.

2. The multi-layer dye box for supercritical waterless dyeing according to claim 1, characterized in that: The height of the barrel section is 40-100 mm, and the number of the barrel sections is less than or equal to 5.

3. The multi-layer dye box for supercritical waterless dyeing according to claim 1 or 2, characterized in that: The cylinder section comprises a connecting outer wall and a flow bottom plate, and the flow bottom plate is arranged at the bottom of the connecting outer wall. Preferably, the connecting outer wall is cylindrical, the flow bottom plate protrudes from the bottom of the connecting outer wall, and the flow bottom plate can be inserted into the lower cylinder section, adjacent connecting outer walls are connected by bolts, and the flow bottom plate can be clamped with the connecting outer wall of the lower cylinder section. Preferably, the connecting outer wall is cylindrical, the bottom of the circulation bottom plate is flush with the bottom of the connecting outer wall or located inside the connecting outer wall, and the adjacent cylinder sections are rotationally connected or pull-type connected. When the dye box is in a working state, there is no relative movement between the adjacent cylinder sections; when the dye box is in a non-working state, the adjacent cylinder sections can rotate or be pulled relative to each other.

4. The multi-layer dye box for supercritical waterless dyeing according to claim 3, characterized in that: The air inlet is located at the upper end of the inner cylinder of the dye box, the distance between the air inlet and the top of the inner cylinder is 30-70 mm, and the distance between the air inlet and the bottom plate of the lowest cylinder throttling flow is 200-600 mm.

5. The multi-layer dye box for supercritical waterless dyeing according to claim 3, characterized in that: A filter plate is arranged on the top of the circulation bottom plate, and a filter net is arranged between the circulation bottom plate and the filter plate.

6. The multi-layer dye box for supercritical waterless dyeing according to claim 1 or 2, characterized in that: An inner cylinder sealing top cover is arranged on the top of the cylinder section located at the top. Preferably, an inner cylinder handle is provided on the top of the inner cylinder sealing top cover. Preferably, a placement hole is provided on the connecting outer wall, and the placement hole is used to place the cylinder segment moving tool. The moving tool is to facilitate placing the dye box into the color matching kettle. The color matching kettle is installed vertically. The dye box has a certain weight, and a tool is needed to lift the dye box and place it into the color matching kettle at a certain height.

7. The multi-layer dye box for supercritical waterless dyeing according to claim 1 or 2, characterized in that: The dye box body comprises a hollow shell, the air inlet is arranged on the upper part of the outer side of the shell, and the air outlet is opened on the lower part. The dye box inner tube is located inside the shell, and the air outlet is located below the dye box inner tube. According to an embodiment of the present invention, the shell comprises an outer shell and an inner shell, a heat preservation layer is arranged between the outer shell and the inner shell, the inner side of the inner shell is in close contact with the inner cylinder of the dye box, and the outer side is in contact with the heat preservation layer. Preferably, a bucket-shaped air outlet is provided below the inner shell. Preferably, a box cover is provided on the top of the dye box body, and the box cover is used to seal the top of the dye box inner cylinder inside the dye box body.

8. The multi-layer dye box for supercritical waterless dyeing according to claim 1 or 2, characterized in that: The filter plate is provided with holes evenly distributed thereon, and preferably the outer surface of the filter plate is coated with a non-stick coating to prevent the dye from sticking and accumulating.

9. The multi-layer dye box for supercritical waterless dyeing according to claim 1 or 2, characterized in that: The mesh number of the filter is 600-1500 meshes. Under normal temperature and pressure, dissolved or undissolved dye particles cannot pass through the filter with this mesh number, which can improve the accuracy of product dyeing.

10. A supercritical dyeing device, comprising a dyeing kettle, wherein the dye box according to any one of claims 1 to 9 is arranged in the dyeing kettle, and the air outlet of the dye box is connected to the dyeing kettle.

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