Spinneret for producing nylon 6 monofilament

Abstract

This invention proposes a spinneret for producing nylon 6 monofilament, comprising a nylon extrusion device and a cooling box. The extrusion die is positioned above the cooling box, which is filled with cooling water. A sealed sleeve is connected to the bottom of the extrusion die. A nitrogen generator is installed on one outer wall of the cooling box. The nitrogen generator is connected to an air inlet on the top side of the sealed sleeve via an air inlet pipe. An exhaust port on the middle side of the sealed sleeve is connected to the extraction end of the nitrogen generator via an exhaust pipe. Under the operation of the nitrogen generator, nitrogen is introduced into the air at the top of the sealed sleeve through the air inlet pipe, and then returned through the exhaust pipe, circulating nitrogen to maintain an oxygen-free environment inside the sealed sleeve. This effectively isolates the air from external oxygen, preventing the frequent generation of oligomers that could clog the extrusion die orifice. Simultaneously, the circulating airflow effectively cools the freshly extruded nylon filament, and the heat is dissipated with the airflow.

Description

Technical Field

[0001] This invention relates to the field of nylon filament production technology, and in particular to a spinneret for producing nylon 6 monofilament. Background Technology

[0002] The basic process of nylon monofilament production consists of several parts, including nylon chip raw materials, high-temperature melting and extrusion of nylon drawing host, cooling and shaping in cooling water tank, first drawing, heating in 100℃ hot water (or steam) box, second drawing, heating, winding monofilament, and finished product filament separation.

[0003] Application CN202120102268.1 discloses a protective device for a spinneret of horizontally spun nylon monofilament. This device involves fixing a protective cover to the bottom of the spinneret, sealing the top of the cover with a heated spinneret, and ensuring the bottom of the cover is submerged below the water surface. This effectively isolates the nylon monofilament from external oxygen, reducing the degree of reaction between the nylon monofilament and air, and preventing the frequent formation of oligomers. However, some fine oligomer fibers still mix into the water during the spinning process. These fibers are easily carried out by the nylon filament as it travels in the cooling water, affecting its quality. Furthermore, the cooling method for the nylon filament is singular, and the cooling water tends to heat up over prolonged use, thus failing to achieve a good cooling and molding effect. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a spinneret for producing nylon 6 monofilament, which more precisely solves the problems described above.

[0005] This invention is achieved through the following technical solution:

[0006] This invention proposes a spinneret for producing nylon 6 monofilament, comprising a nylon extrusion unit and a cooling box. The extrusion end of the nylon extrusion unit is connected to a preheating chamber, and an extrusion die is located at the bottom of the preheating chamber. The extrusion die is positioned above the cooling box, which is filled with cooling water. A sealing sleeve is connected to the bottom of the extrusion die, extending vertically downwards to the bottom of the cooling box. A first guide wheel for guiding the nylon filament along a horizontal feeding path is located at the bottom of the inner cavity of the sealing sleeve. A guide wheel for guiding the nylon filament is located on one side of the bottom of the inner cavity of the cooling box. The second guide wheel feeds the nylon filament upwards. The bottom of the closed sleeve and the side near the second guide wheel have an outlet for the nylon filament to pass through. The top of the cooling box has a third guide wheel for guiding the nylon filament out. A nitrogen generator is installed on one outer wall of the cooling box. The nitrogen output port of the nitrogen generator is connected to an air inlet pipe, and the other end of the air inlet pipe is connected to an air inlet port on the top side of the closed sleeve. An exhaust port is provided on one side of the middle of the closed sleeve, and the exhaust port is connected to the exhaust end of the nitrogen generator through an exhaust pipe.

[0007] Furthermore, the inner end of the air inlet of the sealing sleeve is connected to an air blowing ring pipe, and the bottom of the air blowing ring pipe is provided with multiple air blowing nozzles arranged in a ring array, and the air blowing direction of the air blowing nozzles is vertically downward.

[0008] Furthermore, the height of the exhaust port of the sealed sleeve is higher than the water level of the cooling water stored inside the sealed sleeve, and a filter cover is connected to the inner end of the exhaust port of the sealed sleeve.

[0009] Furthermore, the middle part of the air intake duct is spirally coiled and bent, and the nylon filament guided between the second guide wheel and the third guide wheel runs through the middle part of the first heat exchange tube.

[0010] Furthermore, the bottom of the sealing sleeve is a water inlet hole, and a fine filter screen is provided at the water inlet hole at the bottom of the sealing sleeve.

[0011] Furthermore, a cooling chamber is provided on one side of the cooling box, the bottom of which is connected to the interior of the cooling box. A water pump is provided at the bottom of the cooling chamber, and a drain port is provided on the side of the bottom of the sealing sleeve near the water pump. The drain port is connected to the water pump's pumping port. The water pump's drain port is connected to a water riser pipe, which extends upward to the top of the cooling chamber. A water spray nozzle is connected to the upper end of the water riser pipe, and a filter cotton layer is provided on the top of the cooling chamber.

[0012] Furthermore, a hydrophobic plate is provided at the bottom of the filter cotton layer, and heat dissipation grilles are provided on both sides of the cooling chamber. The height of the heat dissipation grilles is higher than the water level of the cooling water stored inside the cooling chamber.

[0013] Furthermore, a refrigeration equipment box is provided on the outer wall of the cooling box and on the outer side of the cooling chamber. The refrigeration equipment box is connected to a refrigeration pipe, which extends to the bottom of the inner cavity of the cooling chamber and is arranged in an "S"-shaped bend.

[0014] Furthermore, the exhaust duct has a second heat exchange tube section in the middle that is bent in an "S" shape. The second heat exchange tube section extends into the inner cavity of the cooling chamber and is positioned above the refrigeration tube.

[0015] The beneficial effects of this invention are:

[0016] 1. Under the operation of the nitrogen generator, nitrogen is introduced into the air at the top of the inner cavity of the sealed sleeve through the air inlet pipe, and then the nitrogen is supplied in a circulating manner through the exhaust pipe, so that the air inside the sealed sleeve is in an oxygen-free state, effectively isolating the external oxygen and avoiding the frequent generation of oligomers that would block the extrusion orifice of the extrusion mold. At the same time, under the airflow circulation, the freshly extruded nylon filaments can be effectively cooled and cooled down, and the heat is discharged with the airflow.

[0017] 2. Under the operation of the water pump, the cooling water mixed with fine oligomer filaments at the bottom of the inner cavity of the closed sleeve is extracted. The cooling water is sprayed down along the upper port of the cooling chamber by the water sprayer. The filter cotton layer at the top of the cooling chamber filters the fine oligomer filaments in the cooling water. At the same time, the water-repellent plate is used to make the cooling water drip down in droplets. The cooling water is naturally ventilated and cooled by the heat dissipation grille to maintain the water temperature inside the cooling box.

[0018] 3. In this invention, when the nylon filaments are discharged, the nylon filaments guided between the second and third guide wheels pass through the middle of the first heat exchange tube section. The water temperature inside the first heat exchange tube section is low, which can effectively cool and shape the nylon filaments. Under the periodic operation of the refrigeration equipment box, the refrigeration pipe cools the cooling water inside the cooling chamber. At the same time, when the airflow passes through the second heat exchange tube section, it can exchange heat with the cooling water at the bottom of the cooling chamber, thereby ensuring the temperature of the circulating return gas. Attached Figure Description

[0019] Figure 1 This is a three-dimensional half-sectional view of the present invention;

[0020] Figure 2 This is a three-dimensional structural view of the present invention;

[0021] Figure 3 This is a front sectional view of the structure of the present invention;

[0022] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 for Figure 3 Sectional view at point BB;

[0024] Figure 6 This is a schematic diagram of the water level inside the cooling tank in this invention.

[0025] In the diagram: 1. Nylon extrusion equipment; 101. Preheating box; 102. Extrusion die; 2. Cooling box; 201. Second guide wheel; 202. Third guide wheel; 203. Cooling chamber; 2031. Drainage plate; 2032. Filter cotton layer; 2033. Heat dissipation grid; 3. Sealing sleeve; 301. First guide wheel; 302. Outlet; 303. Fine filter screen; 304. Drainage interface; 4. Nitrogen generator; 401. Inlet duct; 4011. First heat exchange tube section; 402. Air blowing ring pipe; 4021. Air blowing nozzle; 403. Exhaust duct; 4031. Second heat exchange tube section; 4032. Filter hood; 5. Water pump; 501. Water supply pipe; 502. Sprayer; 6. Refrigeration equipment box; 601. Refrigeration pipe; 7. Nylon filament; 8. Water level line. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] Please refer to Figure 1 , Figure 2 and Figure 3 As shown, this invention proposes a spinneret for producing nylon 6 monofilament, including a nylon extrusion device 1 and a cooling box 2. The extrusion end of the nylon extrusion device 1 is connected to a preheating chamber 101. An extrusion die 102 is located at the bottom of the preheating chamber 101 to preheat the nylon raw material. The extrusion die 102 is positioned above the cooling box 2, which is filled with cooling water. A sealing sleeve 3 is connected to the bottom of the extrusion die 102, extending vertically downwards to the bottom of the cooling box 2. The cooling water inside the cooling box 2 fills the inner cavity at the bottom of the sealing sleeve 3, forming a closed inner cavity above the inside of the sealing sleeve 3. A first guide wheel 301 for guiding nylon filament 7 horizontally is located at the bottom of the inner cavity of the sealing sleeve 3. A second guide wheel 201 for guiding nylon filament 7 upwards is located on one side of the bottom of the inner cavity of the cooling box 2. The bottom of the sealing sleeve 3 is close to the second guide wheel. A nylon filament 7 is passed through an outlet 302 on one side of the wheel 201. A third guide wheel 202 is provided on the top of the cooling box 2 to guide the nylon filament 7 out of the material. A nitrogen generator 4 is provided on one side of the outer wall of the cooling box 2. The nitrogen output port of the nitrogen generator 4 is connected to an air inlet pipe 401, and the other end of the air inlet pipe 401 is connected to an air inlet port on one side of the top of the sealing sleeve 3. An exhaust port is provided on one side of the middle part of the sealing sleeve 3, and the exhaust port is connected to the suction end of the nitrogen generator 4 through an exhaust pipe 403. When the nitrogen generator 4 is working, nitrogen is injected into the air at the top of the inner cavity of the sealing sleeve 3 through the air inlet pipe 401, and then returned through the exhaust pipe 403. The nitrogen is circulated and supplied, so that the air inside the sealing sleeve 3 is in an oxygen-free state, effectively isolating the external oxygen and avoiding the frequent generation of oligomers that clog the extrusion orifice of the extrusion mold 102.

[0029] It is worth mentioning that the air inlet of the closed sleeve 3 is connected to an air blowing ring pipe 402. The bottom of the air blowing ring pipe 402 is provided with multiple air blowing nozzles 4021 arranged in a ring array. The air blowing direction of the air blowing nozzles 4021 is vertically downward, so that the nitrogen gas is blown downward steadily and evenly inside the closed sleeve 3, effectively reducing the disturbance of the nylon filaments 7 by the airflow. The height of the exhaust port of the closed sleeve 3 is higher than the water level line 8 of the cooling water stored inside the closed sleeve 3. The exhaust port of the closed sleeve 3 is connected to a filter cover 4032 to prevent the intake of fine oligomer filaments.

[0030] The technical solutions in the above embodiments of this application have at least the following technical effects or advantages: Under the operation of the nitrogen generator 4, nitrogen is introduced into the air at the top of the inner cavity of the sealed sleeve 3 through the air inlet pipe 401, and then the nitrogen is circulated back through the exhaust pipe 403, so that the air inside the sealed sleeve 3 is in an oxygen-free state, effectively isolating the external oxygen and avoiding the frequent generation of oligomers that block the extrusion orifice of the extrusion die 102. At the same time, under the airflow circulation, the freshly extruded nylon filament 7 can be effectively cooled and cooled down, and the heat is discharged with the airflow.

[0031] Example 2

[0032] A cooling chamber 203 is provided on one side of the cooling box 2. The bottom of the cooling chamber 203 is connected to the interior of the cooling box 2. A water pump 5 is provided at the bottom of the cooling chamber 203. A drain port 304 is provided on the bottom side of the sealing sleeve 3 near the water pump 5, and the drain port 304 is connected to the water pump 5's water intake port. The drain port of the water pump 5 is connected to a riser pipe 501, and the riser pipe 501 extends upward to the top of the cooling chamber 203. A water spray nozzle 502 is connected to the upper end of the riser pipe 501. The bottom of the closed sleeve 3 is a water inlet hole, and a fine filter screen 303 is provided at the water inlet hole at the bottom of the closed sleeve 3. Under the pumping operation of the water pump 5, the cooling water mixed with oligomer fine filaments at the bottom of the inner cavity of the closed sleeve 3 is extracted, and the cooling water is sprayed down along the upper port of the cooling chamber 203 by the water sprayer 502. The top of the cooling chamber 203 is provided with a filter cotton layer 2032, which can filter the oligomer fine filaments in the cooling water, and then it flows back into the cooling box 2 for use.

[0033] It is worth mentioning that a water-draining plate 2031 is provided at the bottom of the filter cotton layer 2032, and heat dissipation grilles 2033 are provided on both sides of the cooling chamber 203. The height of the heat dissipation grilles 2033 is higher than the water level line 8 of the cooling water stored inside the cooling chamber 203. The water-draining plate 2031 is used to make the cooling water drip down, and the cooling water is naturally ventilated and cooled through the heat dissipation grilles 2033 to maintain the water temperature inside the cooling box 2.

[0034] The technical solutions in the above embodiments of this application have at least the following technical effects or advantages: Under the pumping operation of the water pump 5, the cooling water mixed with oligomer fine filaments at the bottom of the inner cavity of the closed sleeve 3 is extracted, and the cooling water is sprayed down along the upper port of the cooling chamber 203 by the water sprayer 502. Then, the filter cotton layer 2032 at the top of the cooling chamber 203 filters the oligomer fine filaments in the cooling water. At the same time, the water-draining plate 2031 is used to make the cooling water drip down in droplets, and the cooling water is naturally ventilated and cooled down by the heat dissipation grille 2033 to maintain the water temperature inside the cooling box 2.

[0035] Example 3

[0036] The middle part of the air inlet duct 401 is spirally coiled and bent. Since the gas temperature entering the air inlet duct 401 is low, the gas can exchange heat with the cooling water inside the cooling box 2 when it passes through the first heat exchange tube section 4011, thereby maintaining the temperature of the cooling water inside the cooling box 2. When the nylon filament 7 is discharged, the nylon filament 7 guided between the second guide wheel 201 and the third guide wheel 202 passes through the middle part of the first heat exchange tube section 4011. The water temperature inside the first heat exchange tube section 4011 is low, which can effectively cool and shape the nylon filament 7.

[0037] A refrigeration equipment box 6 is provided on the outer wall of the cooling box 2 and on the outer side of the cooling chamber 203. The refrigeration equipment box 6 is connected to a refrigeration pipe 601, which extends to the bottom of the inner cavity of the cooling chamber 203 and is arranged in an "S" shape. During the periodic operation of the refrigeration equipment box 6, the refrigeration pipe 601 cools the cooling water inside the cooling chamber 203. The middle part of the exhaust pipe 403 is provided with a second heat exchange pipe section 4031 that is bent in an "S" shape. The second heat exchange pipe section 4031 extends into the inner cavity of the cooling chamber 203 and is located above the refrigeration pipe 601. Since the exhaust pipe 403 is used to discharge nitrogen gas carrying heat, when the airflow passes through the second heat exchange pipe section 4031, it can exchange heat with the cooling water at the bottom of the cooling chamber 203, thereby ensuring the temperature of the circulating return gas.

[0038] The technical solutions in the above embodiments of this application have at least the following technical effects or advantages: When the nylon filament 7 is discharged, the nylon filament 7 guided between the second guide wheel 201 and the third guide wheel 202 passes through the middle of the first heat exchange tube section 4011. The water temperature inside the first heat exchange tube section 4011 is low, which can effectively cool and shape the nylon filament 7. Under the periodic operation of the refrigeration equipment box 6, the refrigeration pipe 601 cools and lowers the cooling water inside the cooling chamber 203. At the same time, when the airflow passes through the second heat exchange tube section 4031, it can exchange heat with the cooling water at the bottom of the cooling chamber 203, thereby ensuring the temperature of the circulating return gas.

[0039] Of course, the present invention may have many other embodiments. Based on this embodiment, other embodiments obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention.

Claims

1. A spinneret for producing nylon 6 monofilament, comprising a nylon extrusion device (1) and a cooling box (2), characterized in that, The extrusion end of the nylon extrusion equipment (1) is connected to a preheating box (101). The bottom of the preheating box (101) is provided with an extrusion die (102). The extrusion die (102) is located above the cooling box (2). The cooling box (2) is filled with cooling water. The bottom of the extrusion die (102) is connected to a sealing sleeve (3). The sealing sleeve (3) extends vertically downward to the bottom of the cooling box (2). The bottom of the inner cavity of the sealing sleeve (3) is provided with a first guide wheel (301) for guiding the nylon filament (7) to feed horizontally. The bottom side of the inner cavity of the cooling box (2) is provided with a second guide wheel (201) for guiding the nylon filament (7) to feed upward. The bottom of the closed sleeve (3) and the side near the second guide wheel (201) are provided with an outlet (302) for the nylon filament (7) to pass through. The top of the cooling box (2) is provided with a third guide wheel (202) for guiding the nylon filament (7) to be discharged. A nitrogen generator (4) is provided on one side of the outer wall of the cooling box (2). The nitrogen output interface of the nitrogen generator (4) is connected to an air inlet pipe (401), and the other end of the air inlet pipe (401) is connected to an air inlet provided on one side of the top of the closed sleeve (3). An exhaust port is provided on one side of the middle part of the closed sleeve (3), and the exhaust port is connected to the exhaust end of the nitrogen generator (4) through an exhaust pipe (403). The inner end of the air inlet of the closed sleeve (3) is connected to an air blowing ring pipe (402). The bottom of the air blowing ring pipe (402) is provided with multiple air blowing nozzles (4021) arranged in a ring array, and the air blowing direction of the air blowing nozzles (4021) is vertically downward. The height of the exhaust port of the closed sleeve (3) is higher than the water level of the cooling water stored inside the closed sleeve (3), and the inner end of the exhaust port of the closed sleeve (3) is connected to a filter cover (4032). The middle part of the air inlet duct (401) is spirally coiled and bent, and the nylon filament (7) guided between the second guide wheel (201) and the third guide wheel (202) runs through the middle part of the first heat exchange tube (4011); The bottom of the sealing sleeve (3) is a water inlet hole, and a fine filter screen (303) is provided at the water inlet hole at the bottom of the sealing sleeve (3). The cooling box (2) has a cooling chamber (203) on one side. The bottom of the cooling chamber (203) is connected to the interior of the cooling box (2). A water pump (5) is provided at the bottom of the cooling chamber (203). A drain port (304) is provided on the side of the bottom of the sealing sleeve (3) near the water pump (5). The drain port (304) is connected to the water pump (5) pumping port. The drain port of the water pump (5) is connected to a water riser pipe (501). The water riser pipe (501) extends upward to the top of the cooling chamber (203). A water sprayer (502) is connected to the upper end of the water riser pipe (501). A filter cotton layer (2032) is provided on the top of the cooling chamber (203). A hydrophobic plate (2031) is provided at the bottom of the filter cotton layer (2032), and heat dissipation grilles (2033) are provided on both sides of the cooling chamber (203). The height of the heat dissipation grilles (2033) is higher than the water level of the cooling water stored inside the cooling chamber (203). The cooling box (2) has a refrigeration equipment box (6) on its outer side wall and on the outer side of the cooling chamber (203). The refrigeration equipment box (6) is connected to a refrigeration pipe (601). The refrigeration pipe (601) extends to the bottom of the inner cavity of the cooling chamber (203) and is arranged in an "S" shaped bend.

2. The spinneret for producing nylon 6 monofilament according to claim 1, characterized in that, The exhaust duct (403) has a second heat exchange tube section (4031) with an "S" bend in the middle. The second heat exchange tube section (4031) extends into the inner cavity of the cooling chamber (203) and is located above the refrigeration tube (601).

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