A meltblown spinning cooling device

Abstract

This invention provides a meltblown spinning cooling device, relating to the field of meltblown fabric cooling technology. It includes a cooling mechanism positioned at the bottom of a spinneret where small spinneret orifices are opened. The cooling mechanism comprises a cooling ring positioned below the spinneret, a zoned cooling component mounted on the cooling ring, and a cooling circulation device connected to the zoned cooling component. The cooling ring is made of a thermally conductive material, and its inner ring is fitted onto the meltblown filament ejected from the spinneret orifices. The cooling circulation device controls the flow of coolant into the zoned cooling component, which sequentially and gradually cools the meltblown filament ejected from the spinneret orifices. This invention reduces internal stress and improves fiber quality by providing gradient cooling to the meltblown filament.

Description

Technical Field

[0001] This utility model relates to the field of meltblown fabric cooling technology, specifically a meltblown spinning cooling device. Background Technology

[0002] In the meltblown spinning process, molten polymer is extruded through small orifices on a spinneret to form filaments. These filaments need to be rapidly cooled and solidified after extrusion to form fibers with specific structures and properties. However, traditional cooling methods have many problems and are difficult to meet the production requirements of high-quality meltblown spinning.

[0003] 1. Uneven cooling: Traditional cooling methods typically use a single cooling environment or simple cooling device, which cannot perform zoned or gradient cooling of the meltblown fibers ejected from the spinneret orifices. This results in inconsistent cooling rates in different parts of the spinning process, which can easily generate internal stress, affecting the fiber structure and properties, and leading to problems such as uneven fiber diameter and reduced strength.

[0004] 2. Low cooling efficiency: Due to an unreasonable design of the cooling device, the heat exchange efficiency between the coolant and the spinning process is low, requiring a long time for the spinning process to completely cool and solidify. This not only reduces production efficiency but also increases energy consumption.

[0005] 3. Difficulty in meeting diverse production needs: As market demands for the performance and specifications of meltblown spun products increase, cooling devices capable of flexibly adjusting cooling processes are required. Because traditional cooling devices have fixed structures, it is difficult to adjust cooling parameters to suit different production needs, thus limiting product diversity and production flexibility. Utility Model Content

[0006] To address the aforementioned issues, this application provides a meltblown spinning cooling device.

[0007] To achieve the above objectives, this application provides the following technical solution: a meltblown spinning cooling device, comprising a cooling mechanism disposed at the bottom end of a spinneret where a small opening for the spinneret is formed. The cooling mechanism includes a cooling ring disposed below the spinneret, a partitioned cooling component disposed on the cooling ring, and a cooling circulation device connected to the partitioned cooling component. The cooling ring is made of a thermally conductive material, and its inner ring is fitted onto the meltblown filament ejected from the small opening. The cooling circulation device controls the coolant to enter the partitioned cooling component, thereby gradually cooling the meltblown filament ejected from the small opening through the partitioned cooling component in a gradient manner.

[0008] Preferably, the two cooling rings are stacked sequentially and detachably installed below the spinneret; the zoned cooling assembly includes cooling pipes respectively passing through the two cooling rings, and inlet and outlet pipes disposed on the side of each cooling ring and connected to the bottom and top of the cooling pipes respectively, the cooling pipes having a spiral structure; the cooling circulation equipment controls the coolant to flow back to the cooling circulation equipment sequentially along the inlet pipe, cooling pipe and outlet pipe; the temperature of the coolant flowing in the upper cooling pipe is higher than the temperature of the coolant in the lower cooling pipe.

[0009] Preferably, a heat insulation pad is provided between the two cooling rings, and the heat insulation pad has a ring-shaped structure.

[0010] Preferably, the zoned cooling assembly includes a first cooling pipe passing through the cooling ring and located on the upper part of the cooling ring, a second cooling pipe passing through the cooling ring and located below the first cooling pipe, and a connecting sleeve passing through the cooling ring and connecting the adjacent ends of the first cooling pipe and the second cooling pipe. The top end of the first cooling pipe is connected to an outlet pipe, and the bottom end of the second cooling pipe is connected to an inlet pipe. The cross-section of the first cooling pipe is larger than the cross-section of the second cooling pipe. The cooling circulation equipment controls the coolant to flow back to the cooling circulation equipment in sequence along the outlet pipe, the first cooling pipe, the second cooling pipe, and the inlet pipe.

[0011] Preferably, the cross-sectional area of ​​the first cooling pipe is twice the cross-sectional area of ​​the second cooling pipe.

[0012] The beneficial effects of this invention are as follows: by using a zoned cooling component to perform gradient cooling on meltblown spinning, the spinning yarn can gradually adapt to temperature changes during the cooling process, reducing the generation of internal stress, ensuring the uniformity of fiber diameter, and improving the quality of meltblown spinning. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a simplified structural diagram of the meltblown spinning cooling device proposed in this utility model.

[0015] Figure 2 This is a schematic diagram of the unfolded structure of the meltblown spinning cooling device proposed in this utility model.

[0016] Figure 3 This is a schematic diagram of the cooling ring and cooling pipe structure of this utility model.

[0017] Figure 4 This is a schematic diagram of the cooling ring, the first cooling pipe, and the second cooling pipe of this utility model.

[0018] In the diagram: 1. Spinneret; 2. Cooling ring; 3. Liquid inlet pipe; 4. Liquid outlet pipe; 5. Heat insulation pad; 6. Spinneret orifice; 7. Cooling pipe; 8. First cooling pipe; 9. Second cooling pipe; 10. Connecting sleeve. Detailed Implementation

[0019] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the embodiments without creative effort are all within the protection scope of this utility model.

[0020] Example 1: Reference Figures 1-4 The meltblown spinning cooling device shown includes a cooling mechanism located at the bottom end of a spinneret 1 where a spinneret hole 6 is opened. The cooling mechanism includes a cooling ring 2 located below the spinneret 1, a partitioned cooling component located on the cooling ring 2, and a cooling circulation device connected to the partitioned cooling component. The cooling ring 2 is made of a thermally conductive material, and its inner ring is fitted onto the meltblown filament ejected from the spinneret hole 6. The cooling circulation device controls the coolant to enter the partitioned cooling component, and the partitioned cooling component sequentially cools the meltblown filament ejected from the spinneret hole 6 in a gradient manner.

[0021] In this embodiment, when meltblown filament is ejected from the spinneret 6, it passes through the inner ring of the cooling ring 2. The cooling ring 2 is equipped with a partitioned cooling component. The cooling circulation equipment controls the coolant to enter the partitioned cooling component and cools the meltblown filament in a gradient from top to bottom. This facilitates the meltblown filament's adaptation to temperature changes, reduces the generation of internal stress, ensures the uniformity of fiber diameter, and improves the quality of meltblown filament.

[0022] In this embodiment, compared to traditional cooling methods (such as air cooling or water baths), which can easily lead to inconsistent cooling rates between the spinning surface and the interior, causing fiber deformation or breakage, the metal tube cooling device uses non-contact thermal radiation cooling to avoid direct contact with the cooling medium and ensure uniform cooling of the spinning process. Traditional cooling methods (such as water baths) are prone to causing oxidation of the spinning surface, resulting in darkened and dull fibers.

[0023] The cooling circulation device includes a connecting pipe, a cooling pool, and a water pump. The cooling pool is connected to the inlet pipe 3 and the outlet pipe 4 through the connecting pipe, and the water pump controls the cooling liquid to circulate.

[0024] The coolant used includes ethylene glycol-based coolant, alcohol-based coolant, and anhydrous coolant.

[0025] like Figure 1 and Figure 2As shown, two cooling rings 2 are stacked sequentially and detachably installed below the spinneret 1; the partitioned cooling assembly includes cooling pipes 7 respectively passing through the two cooling rings 2, and inlet pipes 3 and outlet pipes 4 set on the side of each cooling ring 2 and connecting the bottom and top of the cooling pipes 7 respectively. The cooling pipes 7 have a spiral structure; the cooling circulation equipment controls the coolant to flow back to the cooling circulation equipment sequentially along the inlet pipe 3, cooling pipes 7 and outlet pipes 4; the temperature of the coolant flowing in the upper cooling pipe 7 is higher than the temperature of the coolant in the lower cooling pipe 7.

[0026] In this embodiment, the coolant temperature in the cooling pipe 7 of the upper cooling ring 2 is higher, while the coolant temperature in the cooling pipe 7 of the lower cooling ring 2 is lower. After the melt-spun yarn is extruded from the spinneret 6, it first passes through the upper cooling ring 2, where the higher-temperature coolant comes into contact with the yarn, providing gentle initial cooling and slowing down the cooling rate to avoid excessive internal stress caused by rapid cooling. Subsequently, the yarn enters the lower cooling ring 2, where it undergoes thorough heat exchange with the lower-temperature coolant, resulting in rapid cooling and solidification. This gradient cooling method makes the internal structure of the fiber more uniform, reduces internal defects, and improves the fiber's strength, toughness, and dimensional stability. The two cooling rings 2 work in tandem, with the upper ring 2 performing initial cooling and the lower ring 2 performing deep cooling; this segmented cooling method improves the efficiency of the cooling process. Simultaneously, the spiral cooling pipe increases the heat exchange area, allowing the coolant to remove the heat from the yarn more quickly. This enables the yarn to cool and solidify faster, shortening the production cycle and improving production efficiency. More melt-blown spun products can be produced in the same amount of time, meeting the needs of large-scale production and reducing production costs.

[0027] The spiral cooling pipe 7 increases the flow path and residence time of the coolant within the cooling ring 2, allowing the coolant to make more thorough contact with the spinning process and ensuring uniform cooling in all directions. Simultaneously, the two cooling rings 2 cool different stages of the spinning process separately, further improving cooling uniformity. This avoids problems such as uneven fiber diameter and inconsistent crystallinity caused by uneven cooling, resulting in meltblown spun products with more consistent performance and quality.

[0028] In this embodiment, the cooling circulation equipment can precisely control the temperature and flow rate of the coolant entering the two cooling rings 2. By adjusting the temperature and flow rate of the coolant, the cooling process parameters can be flexibly adjusted according to different product requirements, such as fiber diameter, crystallinity, and strength. This enables the production of meltblown spun products with different properties and specifications, meeting diverse market demands.

[0029] like Figure 1 and Figure 2As shown, in this embodiment, a heat insulation pad 5 is provided between the two cooling rings 2, and the heat insulation pad 5 has a ring-shaped structure.

[0030] In this embodiment, the heat insulation pad 5 prevents ineffective heat transfer between the two cooling rings 2, allowing the coolant in each cooling ring 2 to focus more on cooling the corresponding stage of spinning. Heat from the upper cooling ring 2 is not additionally lost to the lower cooling ring 2, and the lower cooling ring 2 is not interfered with by heat from the upper ring, enabling more efficient heat exchange between the coolant and the spinning process. This accelerates the cooling speed of spinning, shortens the production cycle, and improves overall production efficiency. Simultaneously, due to the improved cooling efficiency, the frequency of coolant recycling and energy consumption can be appropriately reduced, saving production costs.

[0031] like Figure 4 As shown, the zoned cooling assembly includes a first cooling pipe 8 passing through the cooling ring 2 and located on the upper part of the cooling ring 2, a second cooling pipe 9 passing through the cooling ring 2 and located below the first cooling pipe 8, and a connecting sleeve 10 passing through the cooling ring 2 and connecting the adjacent ends of the first cooling pipe 8 and the second cooling pipe 9. The top end of the first cooling pipe 8 is connected to the liquid outlet pipe 4, and the bottom end of the second cooling pipe 9 is connected to the liquid inlet pipe 3. The cross-section of the first cooling pipe 8 is larger than the cross-section of the second cooling pipe 9. The cooling circulation equipment controls the coolant to flow back to the cooling circulation equipment in sequence along the liquid outlet pipe 4, the first cooling pipe 8, the second cooling pipe 9 and the liquid inlet pipe 3.

[0032] In this embodiment, the coolant sequentially passes through a first cooling pipe 8 with a larger cross-section, a connecting sleeve 10, and a second cooling pipe 9 with a smaller cross-section. Because the first cooling pipe 8 has a large cross-section, the coolant flow rate within it is relatively slow, resulting in a longer contact time between the coolant and the spinning process. This allows for gentler initial cooling, slowing down the cooling rate of the spinning process and reducing internal stress. Conversely, the second cooling pipe 9 has a smaller cross-section, allowing for a faster coolant flow rate and rapid removal of heat from the spinning process, achieving deep cooling. This gradient cooling method makes the internal structure of the fiber more uniform, improving the fiber's strength and toughness.

[0033] The connecting sleeve 10 connects the first cooling pipe 8 and the second cooling pipe 9, creating a continuous flow path for the coolant within the cooling ring 2. As the coolant flows through the first and second cooling pipes 8 and 9, it effectively covers all areas within the cooling ring, ensuring uniform cooling of all parts of the filament during the spinning process. This avoids problems such as uneven fiber diameter and inconsistent crystallinity caused by uneven cooling, thus improving the quality and consistency of meltblown spun products.

[0034] like Figure 4 As shown, the cross-sectional area of ​​the first cooling pipe 8 is twice the cross-sectional area of ​​the second cooling pipe 9.

[0035] In this embodiment, the cross-sectional area of ​​the first cooling pipe 8 is twice that of the second cooling pipe 9. When the coolant flows in the first cooling pipe 8, the flow rate is relatively slow due to the wider channel. This allows the coolant more time for heat exchange with the spinning process, gently lowering the spinning temperature and providing initial cooling, effectively reducing the internal stress caused by rapid cooling. Upon entering the smaller cross-section of the second cooling pipe 9, the coolant's flow rate increases, quickly carrying away the heat from the spinning process and achieving deep cooling. This refined gradient cooling method makes the internal structure of the fiber more uniform, improving the fiber's strength and toughness.

[0036] The larger cross-sectional area of ​​the first cooling pipe 8 allows for a more uniform distribution of the coolant upon entering the cooling ring, covering a larger spinning area. The smaller cross-sectional area of ​​the second cooling pipe 9 promotes stronger flow of the coolant in localized areas, further enhancing the cooling effect on specific parts of the spinning process. The combination of these two features ensures uniform cooling throughout the spinning process, avoiding problems such as fiber diameter differences and uneven crystallinity caused by uneven cooling, thus improving the quality and consistency of meltblown spun products. In the production of precision filter materials, the uniform fiber structure significantly improves filtration efficiency and precision.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A melt-blowing spinning cooling device, comprising a cooling mechanism arranged at the bottom end of a spinneret (1) to open the opening position of a spinning orifice (6), characterized in that, The cooling mechanism includes a cooling ring (2) located below the spinneret (1), a partitioned cooling component located on the cooling ring (2), and a cooling circulation device connected to the partitioned cooling component; the cooling ring (2) is made of thermally conductive material, and the inner ring is fitted onto the meltblown filament ejected from the spinneret orifice (6); The cooling circulation equipment controls the coolant to enter the partitioned cooling component, and the meltblown filaments sprayed from the spinneret (6) are cooled in a gradient manner through the partitioned cooling component.

2. The meltblown spinning cooling device according to claim 1, characterized in that: Two cooling rings (2) are stacked in sequence and detachably installed below the spinneret (1); the partitioned cooling assembly includes cooling pipes (7) that pass through the two cooling rings (2) respectively, and liquid inlet pipes (3) and liquid outlet pipes (4) that are set on the side of each cooling ring (2) and connect the bottom and top of the cooling pipes (7) in a spiral structure; The cooling circulation equipment controls the coolant to flow back into the cooling circulation equipment in sequence along the inlet pipe (3), the cooling pipe (7) and the outlet pipe (4); The temperature of the coolant flowing through the upper cooling pipe (7) is higher than the temperature of the coolant flowing through the lower cooling pipe (7).

3. A meltspun quenching device according to claim 2, wherein: A heat insulation pad (5) is provided between the two cooling rings (2), and the heat insulation pad (5) has a ring structure.

4. A meltspun quenching device according to claim 1 wherein: The partitioned cooling assembly includes a first cooling pipe (8) passing through the cooling ring (2) and located on the upper part of the cooling ring (2), a second cooling pipe (9) passing through the cooling ring (2) and located below the first cooling pipe (8), and a connecting sleeve (10) passing through the cooling ring (2) and connecting the adjacent ends of the first cooling pipe (8) and the second cooling pipe (9). The top end of the first cooling pipe (8) is connected to the liquid outlet pipe (4), and the bottom end of the second cooling pipe (9) is connected to the liquid inlet pipe (3). The cross-section of the first cooling pipe (8) is larger than the cross-section of the second cooling pipe (9). The cooling circulation equipment controls the coolant to flow back into the cooling circulation equipment in sequence along the outlet pipe (4), the first cooling pipe (8), the second cooling pipe (9) and the inlet pipe (3).

5. A meltspun quenching device according to claim 4 wherein: The cross-sectional area of ​​the first cooling pipe (8) is twice the cross-sectional area of ​​the second cooling pipe (9).

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