Novel method and device for efficiently removing DMF (Dimethyl Formamide) in PU (Polyurethane) leather product

Abstract

The invention is suitable for the field of leather treatment, and provides a novel method and device for efficiently removing DMF in a PU leather product, the device comprises a closed box, a sealing mechanism is arranged at the top end of the closed box, a water inlet valve and a pressure valve are arranged on the side wall of the sealing mechanism, an interlayer is arranged in the side wall of the closed box, and an electric heating wire is arranged in the interlayer; the left side wall and the right side wall of the closed box are each provided with a material penetrating opening, and a piece of leather penetrates through the interior of each material penetrating opening. When the device is used, leather to be treated is inserted into the device from the feeding port and then penetrates out of the device from the discharging port, the two extrusion plates are folded towards the middle at the same time to press the leather and seal the material penetrating port, then a closed space can be formed in the closed box and the closed cover plate, water is injected into the closed box through the water inlet valve, and the heating device is started; when the temperature is higher than 100 DEG C, water vapor can be generated, at the moment, the water vapor can replace DMF (dimethyl formamide) in the PU leather product, and meanwhile, the water vapor can also carry out the DMF in the product, so that the DMF escapes from the interior of the product. And if the temperature of the water vapor exceeds the boiling point (153 DEG C) of the DMF, the DMF can also be promoted to automatically escape from the interior of the PU leather product, so that the aim of efficiently removing the DMF from the PU leather product is fulfilled.

Description

Technical Field

[0001] The invention is applicable to the field of leather processing, and is a novel method and device for efficiently removing DMF from PU leather products. Background Art

[0002] With the continuous advancement of industrial modernization, the current leather processing technology system has been gradually improved. However, there will inevitably be DMF residues in PU leather products. Since DMF itself has a pungent smell, PU leather products will emit an unpleasant odor. If there are too many DMF residues in PU leather products, it will further affect the physical and mental health of the human body.

[0003] The boiling point of DMF is 153℃. When removing DMF, people usually use the traditional heating method. However, it is difficult for the general heating device to heat the PU leather product evenly, and it is easy to cause the local temperature of the product to be too high and damage the product.

[0004] In addition, since PU leather is a dense and porous material, it is difficult to make the residual DMF deep inside the product escape by heating. It is conceivable that there will inevitably be DMF left in PU leather products. The emergence of this phenomenon will reduce the quality of PU leather products and pose a potential threat to people's physical and mental health. Summary of the invention

[0005] The purpose of the present invention is to provide a novel method and device for removing DMF from PU leather products in view of the deficiencies of the prior art. When the device is used, the leather to be treated is inserted from two feeding ports, and the staff starts to rotate the two twisting handles, and the threaded rods under the twisting handles begin to push downward. When the bifurcated rods under the threaded rods touch the two extrusion rods, the two extrusion plates will simultaneously close to the middle to press the leather and seal the feeding port, and then the inside of the sealed box and the sealed cover plate will form a closed space, and water will be injected into the sealed box through the water inlet valve and heated. When the temperature is higher than 100°C, water vapor will be generated, and at this time, the water vapor will replace the DMF (dimethylformamide) in the PU leather product, and the water vapor can also carry out the DMF inside the product, so that DMF escapes from the inside of the product. If the water vapor temperature exceeds the boiling point of DMF (153°C), it can also promote DMF to escape from the inside of the PU leather product, thereby achieving the purpose of efficiently removing DMF from the PU leather product.

[0006] To solve the above problems, the present invention provides the following technical solution: a novel method for efficiently removing DMF from PU leather products, comprising the following steps: S1. Put the PU leather inside the heating box, and then install a cover to seal the heating box. The PU leather is in a closed space inside the heating box. Water is injected into the heating box through the water valve on the heating box. The heating box is pressurized to 11kPa, and then the water is heated to 160℃. S2. The water vapor heats the PU leather material, and the dimethylformamide inside the PU leather material is vaporized by heat and precipitated from the inside of the PU leather material. In addition, the water vapor will replace the DMF (dimethylformamide) in the PU leather product, and the water vapor can also carry out the DMF inside the product, so that the DMF / H2O mixed gas escapes from the inside of the product. The PU leather material is rubbed during the heating process; S3. The mixed vapor of water vapor and dimethylformamide is cooled and collected by condensing tiles, and the mixed solution of water and dimethylformamide is heated again, and the temperature is controlled in the range of 100°C to 153°C to allow the water to separate, and the dimethylformamide liquid remaining in the mixed solution can be recycled and reused.

[0007] A device for a novel and efficient method of removing DMF from PU leather products comprises a sealed box, a sealing mechanism is arranged at the top of the sealed box, a water inlet valve and a pressure valve are arranged on the side walls of the sealing mechanism, an interlayer is arranged in the side walls of the sealed box, and a heating wire is arranged inside the interlayer; a feeding port is arranged on the left and right side walls of the sealed box, a leather material passes through the feeding port, a locking component is arranged at the opening of the feeding port, and a kneading component is arranged inside the sealed box; the locking component comprises a slit channel on the left and right side walls of the sealed box, an extrusion plate is slidably inserted into the interior of the slit channel, two extrusion plates are clamped on the side walls of the leather material, and the extrusion plates are connected to the sealed pressure component.

[0008] Furthermore, the sealing mechanism includes a sealed cover plate, a sealing strip is arranged on the opening edge of the sealed box, a sealing groove matching the sealing strip is arranged at the bottom opening of the sealed cover plate, and an air compressor is arranged at the top end of the closed cover plate.

[0009] Furthermore, the closing pressure assembly includes an extrusion rod on the side wall of the extrusion plate, a pressure groove matching the extrusion rod is provided on the side wall of the slit channel, a forked rod is provided on one side of the feeding port, the forked rod is pressed on the side wall of the extrusion rod, an interlaced piece is provided on the top end of the forked rod, a wire groove matching the interlaced piece is provided on the side wall of the closed cover plate, and the forked rod is connected to the downward pressure assembly.

[0010] Furthermore, the pressing assembly includes a nut block on the side wall of the sealed cover plate, a threaded rod is rotatably arranged inside the nut block, a twist handle is arranged at the top of the threaded rod, a bearing is arranged at the bottom end of the threaded rod, the outer ring of the bearing is fixedly connected to the threaded rod, and the top of the forked rod is fixedly connected to the inner ring of the bearing.

[0011] Furthermore, sealing oil is applied on the side walls of the clamping channel and the extrusion plate.

[0012] Furthermore, the kneading component includes three pressure shafts rotatably arranged at the bottom of the sealed box, an expansion frame is arranged at the top of the pressure shaft, and an extrusion strip is arranged at the end of the expansion frame. The leather material bypasses the outer wall of the three groups of extrusion strips, and the pressure shaft is connected to the driving component.

[0013] Furthermore, the driving assembly includes a stepper motor fixedly arranged at the bottom of the sealed box, a wheel group is arranged at the output end of the stepper motor, driven wheels are rotatably arranged on both sides of the wheel group, the wheel group and the two driven wheels are connected by a belt, and three pressure shafts are respectively connected to the rotating shafts of the driven wheels and the wheel group.

[0014] Furthermore, the end of the expansion frame is provided with a threaded head, the end of the extrusion strip is provided with a threaded hole, and the threaded hole at the end of the pressure shaft is inserted into the threaded head.

[0015] Furthermore, the bottom of the sealed box is provided with an axial hole matching the three pressure shafts, a sealed bearing is provided inside the axial hole, the pressure shaft is inserted into the inner ring of the sealed bearing, and the outer ring of the sealed bearing is tightly connected to the axial hole.

[0016] Compared with the prior art, the embodiments of the present application have the following beneficial effects: First, when the device is in use, the leather to be processed is inserted from the two feeding ports, and the staff starts to rotate the two twisting handles. The threaded rods under the twisting handles start to push downward. When the bifurcated rods under the threaded rods touch the two extrusion rods, the two extrusion plates will simultaneously close to the middle to press the leather and seal the feeding ports, and then a closed space will be formed inside the sealed box and the sealed cover plate. Water is injected into the sealed box through the water inlet valve and heated. The water can be heated to 160°C in a closed and high-pressure environment. The water vapor will fill the entire space inside the sealed box to heat the leather in all directions, and the dimethylformamide inside the leather can be quickly evaporated and precipitated. In addition, the water vapor will replace the DMF (dimethylformamide) in the PU leather product, and the water vapor can also carry out the DMF inside the product, so that the DMF / H2O mixed gas escapes from the inside of the product. The effect of efficiently removing dimethylformamide is achieved.

[0017] Secondly, the stepper motor drives the wheel group and two driven wheel discs to rotate at the same time through the belt. The three pressure shafts at the top of the wheel group and the two driven wheel discs will rotate inside the closed box, and the extrusion strips on the outside of the rotating shaft will crush and knead the leather. The dimethylformamide deep inside the leather can escape from the dense structure of the leather faster under the kneading conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the front view of the present invention.

[0019] Figure 2 It is a schematic diagram of a side view of the present invention.

[0020] Figure 3 It is a schematic diagram of the present invention when viewed from above.

[0021] Figure 4 Schematic diagram of a stepping motor of the present invention.

[0022] Figure 5 It is a schematic diagram of the leather material of the present invention.

[0023] Figure 6 It is a schematic diagram of a cross-section of the present invention.

[0024] Figure 7 It is a schematic diagram of the pressure axis of the present invention.

[0025] Figure 8 Schematic diagram of an extruded plate of the present invention.

[0026] Fig. 9 Schematic diagram of the extruded rod of the present invention.

[0027] Description of reference numerals: Sealed box 1, sealing strip 101, feeding port 102, slit channel 103, pressure groove 104, sealed cover plate 2, water inlet valve 201, pressure valve 202, wire groove 203, air compressor 204, leather material 3, nut block 4, twist handle 401, threaded rod 402, bearing 403, forked rod 404, inserted piece 405, stepping motor 5, driven wheel disc 501, wheel disc group 502, belt 503, extrusion plate 6, extrusion rod 601, pressure shaft 7, expansion frame 701, extrusion strip 702. DETAILED DESCRIPTION

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The present invention provides a novel method for removing DMF from PU leather products, comprising the following steps: S1. Put the PU leather inside the heating box, and then install a cover to seal the heating box. The PU leather is in the closed space inside the heating box. Water is injected into the heating box through the water valve on the heating box. The heating box is pressurized to 11kpa, and then the water is heated to 160℃. S2. The PU leather is heated with steam, and the dimethylformamide inside the PU leather is heated and vaporized and precipitated from the inside of the PU leather, and the PU leather is rubbed during the heating process; S3. The mixed vapor of water vapor and dimethylformamide is cooled and collected by condensing tiles, and the mixed solution of water and dimethylformamide is heated again, and the temperature is controlled in the range of 100°C to 153°C to allow the water to separate, and the dimethylformamide liquid remaining in the mixed solution can be recycled and reused.

[0031] A novel method and device for efficiently removing DMF from PU leather products, such as Figure 1-9 As shown, it includes a sealed box 1, a sealing mechanism is provided at the top of the sealed box 1, a water inlet valve 201 and a pressure valve 202 are provided on the side wall of the sealing mechanism, an interlayer is provided in the side wall of the sealed box 1, and a heating wire is provided inside the interlayer; a feeding port 102 is provided on the left and right side walls of the sealed box 1, a leather material 3 passes through the inside of the feeding port 102, a locking component is provided at the opening of the feeding port 102, and a kneading component is provided inside the sealed box 1; the locking component includes a slit channel 103 on the left and right side walls of the sealed box 1, an extrusion plate 6 is slidably inserted inside the slit channel 103, two extrusion plates 6 are clamped on the side wall of the leather material 3, and the extrusion plate 6 is connected to the sealed pressure component.

[0032] In this embodiment, the leather material 3 to be processed is inserted from the two feeding ports 102, and water is injected into the sealed box 1 through the water inlet valve 201 and heated. The water can be heated to 160°C in a closed and high-pressure environment, and the water vapor will fill the entire space inside the sealed box 1 to heat the leather material 3 in all directions. The dimethylformamide inside the leather material 3 can be quickly evaporated and precipitated, thereby achieving the effect of efficiently removing dimethylformamide. Compared with the dimethylformamide removal method of the prior art, direct heating is usually used to remove dimethylformamide from PU leather products, which can easily lead to local overheating and thus scald the product. The temperature of the water vapor of the present invention is easier to control.

[0033] In a further embodiment of the present invention, Figure 1-6 As shown, the sealing mechanism includes a sealed cover plate 2, a sealing strip 101 is arranged on the opening edge of the sealed box 1, a sealing groove matching the sealing strip 101 is arranged at the bottom opening of the sealed cover plate 2, and an air compressor 204 is arranged at the top of the closed cover plate 2.

[0034] In this embodiment, the sealed cover 2 is removed when the sealed box 1 is maintained, and the cooperation of the sealing strip 101 and the sealing groove between the sealed box 1 and the sealed cover 2 increases the airtightness, which can prevent the loss of internal pressure of the sealed box 1. The air compressor 204 can pressurize the internal pressure of the sealed box 1 to allow the water vapor to reach a higher temperature.

[0035] In a further embodiment of the present invention, Figure 1-5 As shown, the closing pressure assembly includes an extrusion rod 601 on the side wall of the extrusion plate 6, a pressure groove 104 matching the extrusion rod 601 is provided on the side wall of the slit channel 103, a forked rod 404 is provided on one side of the feeding port 102, the forked rod 404 is pressed on the side wall of the extrusion rod 601, an interlaced piece 405 is provided at the top end of the forked rod 404, a wire groove 203 matching the interlaced piece 405 is provided on the side wall of the closed cover plate 2, and the forked rod 404 is connected to the downward pressure assembly.

[0036] In this embodiment, when the bifurcated rod 404 is pushed downward and touches the two extrusion rods 601, the two extrusion plates 6 will simultaneously close together to press the leather 3 and seal the threading port. After each section of the leather 3 is processed, the two extrusion plates 6 will open to allow the next section of the leather 3 to pass into the sealed box 1 and merge again.

[0037] In a further embodiment of the present invention, Figure 1-5As shown, the pressing assembly includes a nut block 4 on the side wall of the closed cover plate 2, a threaded rod 402 is rotatably arranged inside the nut block 4, a twist handle 401 is arranged at the top end of the threaded rod 402, a bearing 403 is arranged at the bottom end of the threaded rod 402, the outer ring of the bearing 403 is fixedly connected to the threaded rod 402, and the top end of the forked rod 404 is fixedly connected to the inner ring of the bearing 403.

[0038] In this embodiment, the staff starts to rotate the two twist handles 401, and the threaded rod 402 below the twist handles 401 starts to move downward. During the process of the threaded rod 402 spirally moving downward, the bifurcated rod 404 does not twist due to the cooperation between the insertion piece 405 and the wire groove 203.

[0039] In a further embodiment of the present invention, Figure 1-5 As shown, sealing oil is applied on the side walls of the slot channel 103 and the extrusion plate 6 .

[0040] In this embodiment, the sealing oil between the gap channel 103 and the extrusion plate 6 increases the sealing performance of the inner chamber of the sealed box 1 .

[0041] In a further embodiment of the present invention, Figure 1-7 As shown, the kneading component includes three pressure shafts 7 rotatably arranged at the bottom of the sealed box 1, an expansion frame 701 is arranged at the top of the pressure shaft 7, and an extrusion strip 702 is arranged at the end of the expansion frame 701. The leather material 3 bypasses the outer wall of the three groups of extrusion strips 702, and the pressure shaft 7 is connected to the driving component.

[0042] In this embodiment, when the three pressure shafts 7 and the extrusion strips 702 on their outer sides are attached to the leather 3 and twisted, the extrusion strips 702 will crush and knead the leather 3. The dimethylformamide deep inside the leather 3 can escape from the dense structure of the leather more quickly under the kneading condition.

[0043] In a further embodiment of the present invention, Figure 3-7 As shown, the driving assembly includes a stepper motor 5 fixedly arranged at the bottom of the sealed box 1, and a wheel group 502 is arranged at the output end of the stepper motor 5. Driven wheels 501 are rotatably arranged on both sides of the wheel group 502. The wheel group 502 and the two driven wheel groups 501 are connected by a belt 503, and three pressure shafts 7 are respectively connected to the rotating shafts of the driven wheel 501 and the wheel group 502.

[0044] In this embodiment, the stepper motor 5 drives the wheel set 502 and the two driven wheel sets 501 to rotate simultaneously through the belt 503 , and the three pressure shafts 7 at the top of the rotating ends of the wheel set 502 and the two driven wheel sets 501 rotate inside the sealed box 1 .

[0045] In a further embodiment of the present invention, Figure 3-7 As shown, the end of the expansion frame 701 is provided with a threaded head, the end of the extrusion strip 702 is provided with a threaded hole, and the threaded hole at the end of the pressure shaft 7 is inserted into the threaded head.

[0046] In this embodiment, the extrusion strip 702 can be rotated and removed from the expansion frame 701, and the staff can replace different diameter models according to the processing requirements. The smaller the diameter of the extrusion strip 702, the stronger the kneading effect will be.

[0047] In a further embodiment of the present invention, Figure 3-7 As shown, the bottom of the sealed box 1 is provided with an axial hole matching the three pressure shafts 7, a sealed bearing is provided inside the axial hole, the pressure shaft 7 is inserted into the inner ring of the sealed bearing, and the outer ring of the sealed bearing is tightly connected to the axial hole.

[0048] In this embodiment, the sealed bearing on the outside of the pressure shaft 7 reduces the leakage of the sealed box 1. After the sealed box 1 loses a certain amount of gas from the shaft hole, the sealed box 1 will continue to heat the water to replenish the air pressure lost from the shaft hole.

[0049] Working principle: insert the leather material 3 to be treated from the two feeding ports 102, inject water into the sealed box 1 through the water inlet valve 201 and heat it. The water can be heated to 160°C in a closed and high-pressure environment. The water vapor will fill the entire space inside the sealed box 1 to heat the leather material 3 in all directions. The dimethylformamide in the leather material 3 can evaporate and precipitate quickly, achieving the effect of efficient removal of dimethylformamide. Compared with the dimethylformamide removal method of the prior art, the direct heating method was used to remove dimethylformamide from PU leather products. This can easily lead to local overheating and thus scald the product. The temperature of the water vapor of the present invention is better controlled. When the sealed box 1 is maintained, the sealed cover plate 2 is removed. The cooperation of the sealing strip 101 and the sealing groove between the sealed box 1 and the sealed cover plate 2 increases the airtightness and can prevent the loss of pressure inside the sealed box 1. When the bifurcated rod 404 is pushed downward, when the bifurcated rod 404 touches the two extrusion rods 601, the two extrusion plates 6 will simultaneously close to the middle to press the leather material 3 and seal the feeding port. After each section of the leather material 3 is processed, the two extrusion plates 6 will open to allow The next section of leather 3 penetrates into the sealed box 1 and merges again. The staff starts to rotate the two twisting handles 401, and the threaded rod 402 under the twisting handle 401 starts to push downward. During the process of the threaded rod 402 spirally pushing downward, the bifurcated rod 404 does not twist due to the cooperation of the inserted sheet 405 and the wire groove 203. The sealing oil between the gap channel 103 and the extrusion plate 6 increases the sealing of the internal chamber of the sealed box 1. When the three pressure shafts 7 and the extrusion strips 702 on the outside thereof are attached to the leather 3 and twisted, the extrusion strips 702 will crush and rub the leather 3. , the dimethylformamide deep inside the leather 3 can escape through the dense structure of the leather more quickly under the condition of rubbing, the stepper motor 5 drives the wheel group 502 and the two driven wheel disks 501 to rotate through the belt 503 at the same time, and the three pressure shafts 7 at the top of the rotating wheel group 502 and the two driven wheel disks 502 will rotate inside the closed box 1, and the extrusion strip 702 can be rotated and disassembled from the expansion frame 701. The staff can replace different diameter models according to the processing requirements. The smaller the diameter of the extrusion strip 702, the stronger the rubbing effect will be.

[0050] In this embodiment, the sealed bearing on the outside of the pressure shaft 7 reduces the leakage of the sealed box 1. After the sealed box 1 loses a certain amount of gas from the shaft hole, the sealed box 1 will continue to heat the water to replenish the air pressure lost from the shaft hole.

[0051] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0052] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of the above-mentioned units. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.

[0053] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.

Claims

1. A novel method for removing DMF from PU leather products, characterized in that, The following steps are involved: S1. Place the PU leather inside the heating box, and then install a cover to seal the heating box. The PU leather is in a closed space inside the heating box. Water is injected into the heating box through the water valve on the heating box to pressurize the heating box, and then the water is heated to 160°C. S2. The PU leather is heated by steam, and the dimethylformamide inside the PU leather is vaporized by the heat and precipitated from the inside of the PU leather. In addition, water vapor will replace DMF (dimethylformamide) in PU leather products, and water vapor can also carry out DMF inside the product, so that the DMF / H2O mixed gas escapes from the inside of the product. PU leather is rubbed during the heating process; S3. The mixed vapor of water vapor and dimethylformamide is cooled and collected by condensing tiles, and the mixed solution of water and dimethylformamide is heated again, and the temperature is controlled in the range of 100°C to 153°C to allow the water to separate, and the dimethylformamide liquid remaining in the mixed solution can be recycled and reused.

2. A novel method and device for efficiently removing DMF from PU leather products, characterized in that: It comprises a sealed box (1), the top of the sealed box (1) being provided with a sealing mechanism, the side wall of the sealing mechanism being provided with a water inlet valve (201) and a pressure valve (202), the side wall of the sealed box (1) being provided with an interlayer, and an electric heating wire being provided inside the interlayer; The left and right side walls of the sealed box (1) are both provided with a material passage opening (102), a leather material (3) passes through the material passage opening (102), a locking component is provided at the opening of the material passage opening (102), and a kneading component is provided inside the sealed box (1); The locking assembly comprises a slot channel (103) on the left and right side walls of the sealed box (1), an extrusion plate (6) slidably inserted into the interior of the slot channel (103), two extrusion plates (6) are clamped on the side walls of the leather material (3), and the extrusion plates (6) are connected to the sealed pressure assembly.

3. A novel method and device for efficiently removing DMF from PU leather products according to claim 2, characterized in that: The sealing mechanism comprises a sealed cover plate (2), a sealing strip (101) is arranged on the opening edge of the sealed box (1), a sealing groove matching the sealing strip (101) is arranged at the bottom opening of the sealed cover plate (2), and an air compressor (204) is arranged at the top end of the sealed cover plate (2).

4. A novel method and device for efficiently removing DMF from PU leather products according to claim 2, characterized in that: The closing pressure component comprises an extrusion rod (601) on the side wall of the extrusion plate (6); a pressure groove (104) matching the extrusion rod (601) is arranged on the side wall of the slit channel (103); a bifurcated rod (404) is arranged on one side of the feeding port (102); the bifurcated rod (404) is pressed onto the side wall of the extrusion rod (601); a penetration sheet (405) is arranged at the top end of the bifurcated rod (404); a wire groove (203) matching the penetration sheet (405) is arranged on the side wall of the closed cover plate (2); and the bifurcated rod (404) is connected to the downward pressure component.

5. A device for a novel method of removing DMF from PU leather products according to claim 4, characterized in that: The pressing assembly comprises a nut block (4) on the side wall of the sealed cover plate (2), a threaded rod (402) being rotatably arranged inside the nut block (4), a twisting handle (401) being arranged at the top end of the threaded rod (402), a bearing (403) being arranged at the bottom end of the threaded rod (402), an outer ring of the bearing (403) being fixedly connected to the threaded rod (402), and a top end of the bifurcated rod (404) being fixedly connected to an inner ring of the bearing (403).

6. A novel method and device for efficiently removing DMF from PU leather products according to claim 2, characterized in that: Sealing oil is applied to the side walls of the clamping channel (103) and the extrusion plate (6).

7. A novel method and device for removing DMF from PU leather products according to claim 2, characterized in that: The kneading component comprises three pressure shafts (7) rotatably arranged at the bottom of the sealed box (1); an expansion frame (701) is arranged at the top of the pressure shaft (7); an extrusion strip (702) is arranged at the end of the expansion frame (701); the leather material (3) passes around the outer side walls of the three groups of extrusion strips (702); and the pressure shaft (7) is connected to the driving component.

8. A novel method and device for removing DMF from PU leather products according to claim 7, characterized in that: The driving assembly comprises a stepper motor (5) fixedly arranged at the bottom of the sealed box (1); a wheel group (502) is arranged at the output end of the stepper motor (5); driven wheels (501) are rotatably arranged on both sides of the wheel group (502); the wheel group (502) and the two driven wheels (501) are connected via a belt (503); and three pressure shafts (7) are respectively connected to the driven wheels (501) and the rotating shafts of the wheel group (502).

9. A novel method and device for removing DMF from PU leather products according to claim 7, characterized in that: The end of the expansion frame (701) is provided with a threaded head, the end of the extrusion strip (702) is provided with a threaded hole, and the threaded hole at the end of the pressure shaft (7) is inserted into the threaded head.

10. A novel method and device for removing DMF from PU leather products according to claim 7, characterized in that: The bottom of the sealed box (1) is provided with an axial hole matching the three pressure shafts (7), a sealed bearing is provided inside the axial hole, the pressure shaft (7) is inserted into the inner ring of the sealed bearing, and the outer ring of the sealed bearing is sealedly connected to the axial hole.

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