A melt-blown cloth spinneret air supply device

Abstract

The application discloses a melt-blown cloth spinneret air supply device, which comprises a spinning component and an air supply component for supplying air to the spinning component, the spinning component comprises a flow channel plate for guiding melt flow, the flow channel plate is provided with a hot air channel, and the sidewall of the flow channel plate is provided with a plurality of hot air inlets communicated with the hot air channel; the air supply component comprises a hot air source and a mixing box for uniformly mixing air output by the hot air source, the mixing box is provided with air outlets, the air outlets correspond to the hot air inlets one by one, and the air outlets and the hot air inlets are communicated through conveying pipes. The melt-blown cloth spinneret air supply device has a reasonable structure, can avoid the phenomenon that the temperature of the end part of the hot air channel is high, the temperature of the middle part is low, the air pressure of the end part is high, and the air pressure of the middle part is low, ensures the consistency of the temperature and the air pressure in the spinneret, and thus ensures that the fibers sprayed from the spinneret are uniform, and improves the yield of the melt-blown cloth.

Description

Technical Field

[0001] This invention relates to the field of meltblown fabric production technology, and in particular to a meltblown fabric spinneret air supply device. Background Technology

[0002] Meltblown nonwoven fabric is a filter material made primarily of polypropylene. Its fiber diameter can reach 1-5 micrometers. These ultrafine fibers with unique capillary structures increase the number of fibers and surface area per unit area, giving meltblown nonwoven fabric excellent filtration, shielding, heat insulation, and oil absorption properties. It can be used in air and liquid filtration materials, isolation materials, absorbent materials, mask materials, thermal insulation materials, and wiping cloths. Meltblown nonwoven fabric is the core material for masks.

[0003] Manufacturing meltblown fabric requires a large amount of hot air. Air heated by an air heater enters the hot air channel of the spinneret air supply device through the mold inlet. In the common preparation process of meltblown fabric, the most crucial step is to use a high-temperature, high-speed hot air stream to disperse the molten material ejected from the spinneret into very fine fibers after obtaining the material in a high-temperature molten state. These fibers are collected and bonded together using their residual heat to form meltblown fabric. In this step, the hot air stream needs to be kept at a constant temperature and pressure within the optimal range (air pressure 0.045 MPa, air temperature between 200℃ and 250℃ depending on the specific requirements of the meltblown fabric) to produce qualified products. However, after the hot air stream enters the hot air channel, there is often a situation where the temperature is high at the ends and low in the middle, and the air pressure is high at the ends and low in the middle. This results in the temperature and air pressure inside the spinneret not meeting the standards, leading to inconsistent meltblown fabric quality and poor filtration effect.

[0004] Therefore, it is necessary to improve the existing air supply device for meltblown fabric spinnerets. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the prior art and provide a meltblown fabric spinneret air supply device that can avoid the phenomenon of high temperature at the end of the hot air channel and low temperature in the middle, and high air pressure at the end and low air pressure in the middle, so as to ensure that the temperature and air pressure inside the spinneret are consistent, thereby ensuring that the fibers sprayed from the spinneret are consistent and improving the yield of meltblown fabric.

[0006] To achieve the above technical effects, the technical solution of the present invention is as follows: a meltblown fabric spinneret air supply device, comprising a spinneret assembly and an air supply assembly for supplying air to the spinneret assembly, wherein the spinneret assembly includes a flow channel plate for guiding the flow of melt, the flow channel plate is provided with a hot air channel, and the side wall of the flow channel plate is provided with a plurality of hot air inlets communicating with the hot air channel; the air supply assembly includes a hot air source and a mixing box for uniformly mixing the air output from the hot air source, the mixing box is provided with an air outlet, the air outlet and the hot air inlet are corresponding one-to-one, and the air outlet and the hot air inlet are connected by a conveying pipe.

[0007] A preferred technical solution is that the mixing chamber is equipped with a stirrer, and there are several stirrers. The mixing chamber is fixedly equipped with a motor for driving the stirrer to rotate, and the mixing chamber is equipped with several air inlets.

[0008] A preferred technical solution further includes a control component for controlling the airflow through the delivery pipe.

[0009] A preferred technical solution is that the conveying pipe is a flexible pipe, and the control component includes an extrusion member for extruding the flexible pipe and changing its diameter.

[0010] A preferred technical solution is that the extrusion component includes a fixed clamping plate and a movable clamping plate disposed on both sides of the conveying pipe, the fixed clamping plate being fixedly connected to the mixing box; it also includes a driving component for driving the movable clamping plate to move closer to or away from the fixed clamping plate.

[0011] A preferred technical solution is that the driving component includes a cylinder fixedly connected to the mixing chamber; the control component further includes a wind pressure sensor disposed at the hot air inlet, and the wind pressure sensor is electrically connected to the controller of the cylinder.

[0012] A preferred technical solution is that the spinneret assembly further includes a filter screen, a spinneret plate, an air duct plate, and a sealing plate. The air duct plate, filter screen, spinneret plate, and air duct plate are arranged sequentially along the flow direction of the melt. Two air duct plates cooperate to form a flow channel for the melt to pass through. The spinneret plate is provided with a plurality of spinneret holes at intervals. The two air duct plates are respectively arranged on both sides of the spinneret holes. The air guiding inclined surface of the air duct plate and the spinneret tip of the spinneret plate are provided with a drawing air duct at intervals. The sealing plate is fixedly arranged on both sides of the air duct plate, spinneret plate, and air duct plate.

[0013] A preferred technical solution is that the lower wall of the flow channel plate is provided with a plurality of hot air outlets communicating with the hot air channel, the spinneret is provided with a hot air channel, and the hot air channel is connected to the hot air outlets and the drawing air channel.

[0014] A preferred technical solution is that the diameter of the hot air outlet is smaller than the diameter of the hot air inlet.

[0015] A preferred technical solution is that the distance between the air-guiding inclined surface of the air duct plate and the spinneret tip of the spinneret plate is 0.8 mm.

[0016] The advantages and beneficial effects of this invention are as follows: The air supply device for the spinneret of meltblown fabric has a reasonable structure. By setting multiple hot air inlets on the side wall of the flow channel plate, the hot air before entering the hot air inlet is mixed evenly in the mixing box, so that the air temperature and air pressure are consistent at each point. Then, it enters the hot air inlet through the conveying pipe. Compared with the prior art, it can avoid the phenomenon of high temperature at the end of the hot air channel and low temperature in the middle, and high air pressure at the end and low air pressure in the middle. It ensures that the temperature and air pressure inside the spinneret are consistent, thereby ensuring that the fibers sprayed from the spinneret are consistent and improving the yield of meltblown fabric. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the meltblown fabric spinneret air supply device of the present invention;

[0018] Figure 2 yes Figure 1 An explosion diagram;

[0019] Figure 3 This is a structural diagram of the air supply component;

[0020] Figure 4 yes Figure 3 An explosion diagram;

[0021] Figure 5 This is a structural schematic diagram of the spinneret assembly;

[0022] Figure 6 yes Figure 5 An explosion diagram;

[0023] Figure 7 yes Figure 5 A sectional view;

[0024] Figure 8 yes Figure 6 A sectional view;

[0025] Figure 9 This is a schematic diagram of the flow channel plate.

[0026] Figure 10 yes Figure 9 A sectional view;

[0027] In the diagram: 1. Flow channel plate; 11. Hot air passage; 12. Hot air inlet; 13. Flow channel; 14. Hot air outlet; 2. Mixing box; 21. Air outlet; 22. Air inlet; 3. Conveying pipe; 4. Agitator; 41. Motor; 51. Fixed clamp plate; 52. Movable clamp plate; 53. Cylinder; 6. Filter screen; 7. Spinneret; 71. Spinneret orifice; 72. Spinneret tip; 73. Hot air duct; 8. Air duct plate; 81. Air intake slope; 82. Wire drawing air duct; 9. Sealing plate. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Example

[0031] like Figure 1-10 As shown, the meltblown fabric spinneret air supply device of the embodiment includes a spinneret assembly and an air supply assembly for supplying air to the spinneret assembly. The spinneret assembly includes a flow channel plate 1 for guiding the flow of melt. The flow channel plate 1 is provided with a hot air channel 11. The side wall of the flow channel plate 1 is provided with a plurality of hot air inlets 12 communicating with the hot air channel 11. The air supply assembly includes a hot air source and a mixing box 2 for mixing the air output from the hot air source evenly. The mixing box 2 is provided with an air outlet 21. The air outlet 21 corresponds one-to-one with the hot air inlet 12. The air outlet 21 and the hot air inlet 12 are connected by a conveying pipe 3.

[0032] Through this design, the flow channel plate 1 not only guides the flow of the melt but also transports high-temperature and high-pressure hot air. Multiple hot air inlets 12 are provided on the side wall of the flow channel plate 1 to increase the air intake channel, thereby ensuring that the hot air channel 11 is quickly filled with hot air. The mixing box 2 ensures that the temperature and pressure of the hot air before entering the hot air inlet 12 are consistent. Then, it is transported to the hot air inlet 12 through the conveying pipe 3, avoiding the phenomenon of high temperature at the end and low temperature and pressure in the middle of the hot air channel 11, and ensuring that the temperature and pressure inside the spinneret are consistent, thereby ensuring that the fibers sprayed from the spinneret are consistent and improving the yield of meltblown fabric.

[0033] Specifically, the mixing chamber 2 is equipped with a stirrer 4, and there are several stirrers 4. The mixing chamber 2 is fixedly equipped with a motor 41 for driving the stirrer 4 to rotate, and the mixing chamber 2 is equipped with several air inlets 22.

[0034] With this design, the stirrer 4 mixes the hot air flow in the mixing box 2, making the air pressure and temperature in the mixing box 2 consistent, so that the air temperature and air pressure of the hot air entering each delivery pipe 3 are consistent.

[0035] Furthermore, it also includes a control component for controlling the airflow through the delivery pipe 3.

[0036] With this design, when the air pressure at a certain hot air inlet 12 is too high, the hot air flow rate of the corresponding delivery pipe 3 can be appropriately reduced, thereby reducing the amount of hot air entering this hot air inlet 12.

[0037] Specifically, the conveying pipe 3 is a flexible pipe, and the control component includes an extruder for squeezing the flexible pipe and changing its diameter.

[0038] With this design, the conveying pipe 3 can be deformed, and the extruder can squeeze the conveying pipe 3 to reduce its diameter, thereby reducing the flow rate of hot air through the conveying pipe 3.

[0039] Specifically, the extrusion component includes a fixed clamping plate 51 and a movable clamping plate 52 disposed on both sides of the conveying pipe 3, wherein the fixed clamping plate 51 is fixedly connected to the mixing box 2; it also includes a driving component for driving the movable clamping plate 52 to move closer to or away from the fixed clamping plate 51.

[0040] With this design, the drive unit controls the position of the movable clamp 52, which works in conjunction with the fixed clamp 51 to change the diameter of the delivery pipe 3.

[0041] Specifically, the driving component includes a cylinder 53 fixedly connected to the mixing chamber 2; the control component also includes a wind pressure sensor disposed at the hot air inlet 12, and the wind pressure sensor is electrically connected to the controller of the cylinder 53.

[0042] With this design, the wind pressure sensor can detect whether the wind pressure at the hot air inlet 12 exceeds the standard. When the standard is exceeded, the controller controls the piston rod of the cylinder 53 to extend, driving the movable clamp 52 to move closer to the fixed clamp 51, squeezing the delivery pipe 3. The wind pressure sensor can be a common sensor on the market, preferably the Hedi HDP862 model.

[0043] Specifically, the spinneret assembly further includes a filter screen 6, a spinneret plate 7, an air duct plate 8, and a sealing plate 9. The air duct plate 1, filter screen 6, spinneret plate 7, and air duct plate 8 are arranged sequentially along the flow direction of the melt. Two air duct plates 1 cooperate to form a flow channel 13 for the melt to pass through. The spinneret plate 7 is provided with a plurality of spinneret holes 71 at intervals. The two air duct plates 8 are respectively arranged on both sides of the spinneret holes 71. The air guiding inclined surface 81 of the air duct plate 8 and the spinneret tip 72 of the spinneret plate 7 are provided with a drawing air duct 82 at intervals. The sealing plate 9 is fixedly arranged on both sides of the air duct plate 1, the spinneret plate 7, and the air duct plate 8.

[0044] This design ensures the proper operation of the spinneret assembly.

[0045] Specifically, the lower wall of the flow channel plate 1 is provided with a plurality of hot air outlets 14 that communicate with the hot air channel 11, and the spinneret 7 is provided with a hot air channel 73, which is connected to the hot air outlets 14 and the drawing air channel 82.

[0046] With this design, the hot air entering the hot air channel 11 from the hot air inlet 12 is discharged from the hot air outlet 14, and guided into the drawing air channel 82 through the hot air channel 73 of the spinneret 7. The high-temperature and high-pressure hot air discharged from the drawing air channel 82 draws the fibers extruded from the spinneret 72.

[0047] Furthermore, the diameter of the hot air outlet 14 is smaller than the diameter of the hot air inlet 12.

[0048] This design increases the pressure of the hot air entering the hot air duct 73.

[0049] Furthermore, the distance between the air-guiding inclined surface 81 of the air duct plate 8 and the spinneret 72 of the spinneret plate 7 is 0.8 mm.

[0050] Compared to the fact that the distance between the air-guiding inclined surface 81 and the spinneret 72 is outside the aforementioned range, this design can ensure that sufficient pressure is applied to the fiber without being too high, thus ensuring the fiber formation.

[0051] Furthermore, the hot air outlet 14 is equipped with a wind temperature sensor that is electrically connected to the hot air source.

[0052] With this design, the temperature of the hot air coming out of the hot air source is controlled by a wind temperature sensor to ensure that the temperature of the hot air in the hot air channel 11 meets the standard; the wind temperature sensor can be a common temperature sensor on the market, preferably Heraeus PT100 model.

[0053] The specific usage of the embodiment is as follows:

[0054] The Z-1800 type polypropylene raw material is fed into the screw extruder to form a molten state. After filtration, it is metered by the metering pump and enters the spinneret assembly through the flow channel 13. In the spinneret assembly, the melt is guided by the flow channel 13, filtered by the filter screen 6, and enters the spinneret plate 7, and is ejected from the spinneret hole 71.

[0055] Hot air is delivered from the hot air source into the mixing box 2 through the air inlet 22. The motor 41 drives the stirrer 4 to rotate, mixing the hot air in the mixing box 2 evenly, so that the temperature and air pressure of the hot air in the mixing box 2 are consistent. Then, the hot air in the mixing box 2 enters the hot air channel 11 through the hot air inlet 12 through the delivery pipe 3. The hot air in the hot air channel 11 is discharged from the hot air outlet 14 into the hot air duct 73, and then enters the drawing air duct 82. The fibers blown out from the drawing air duct 82 apply force to the fibers ejected from the spinneret 71.

[0056] When the wind pressure sensor detects that the wind pressure at a certain hot air inlet 12 exceeds the standard, the controller of the corresponding cylinder 53 controls the piston rod of the cylinder 53 to extend, driving the movable clamp 52 to move closer to the fixed clamp 51, thereby squeezing the delivery pipe 3, reducing the air volume through the delivery pipe 3, and reducing the amount of air volume exiting through the hot air inlet 12.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A meltblown fabric spinneret air supply device, characterized in that, The device includes a spinneret assembly and an air supply assembly for supplying air to the spinneret assembly. The spinneret assembly includes a flow channel plate (1) for guiding the flow of melt. The flow channel plate (1) is provided with a hot air channel (11). The side wall of the flow channel plate (1) is provided with a plurality of hot air inlets (12) communicating with the hot air channel (11). The air supply assembly includes a hot air source and a mixing box (2) for mixing the air output from the hot air source evenly. The mixing box (2) is provided with an air outlet (21). The air outlet (21) corresponds one-to-one with the hot air inlet (12). The air outlet (21) and the hot air inlet (12) are connected by a delivery pipe (3). The mixing chamber (2) is equipped with a stirrer (4), and there are several stirrers (4). The mixing chamber (2) is fixedly equipped with a motor (41) for driving the stirrer (4) to rotate. The mixing chamber (2) is equipped with several air inlets (22). It also includes a control component for controlling the airflow through the delivery pipe (3); The delivery pipe (3) is a flexible pipe, and the control component includes an extruder for extruding the flexible pipe and changing its diameter. The extrusion component includes a fixed clamping plate (51) and a movable clamping plate (52) disposed on both sides of the conveying pipe (3), wherein the fixed clamping plate (51) is fixedly connected to the mixing box (2); it also includes a driving component for driving the movable clamping plate (52) to move closer to or away from the fixed clamping plate (51); The drive unit includes a cylinder (53) fixedly connected to the mixing box (2); the control component also includes a wind pressure sensor disposed at the hot air inlet (12), the wind pressure sensor being electrically connected to the controller of the cylinder (53); The side-by-side direction of the stirrer (4) is consistent with the side-by-side direction of the plurality of air outlets (21), and the axial direction of the stirring shaft of the stirrer (4) is consistent with the extension direction of the air outlets (21).

2. The air supply device for the meltblown fabric spinneret according to claim 1, characterized in that, The spinneret assembly also includes a filter screen (6), a spinneret plate (7), an air duct plate (8), and a sealing plate (9). The air duct plate (1), filter screen (6), spinneret plate (7), and air duct plate (8) are arranged sequentially along the flow direction of the melt. Two air duct plates (1) cooperate to form a flow channel (13) for the melt to pass through. The spinneret plate (7) is provided with a number of spinneret holes (71) at intervals. Two air duct plates (8) are respectively arranged on both sides of the spinneret holes (71). The air duct plate (8) and the spinneret tip (72) of the spinneret plate (7) are provided with a wire drawing air duct (82) at intervals. The sealing plate (9) is fixedly arranged on both sides of the air duct plate (1), spinneret plate (7), and air duct plate (8).

3. The air supply device for the meltblown fabric spinneret according to claim 2, characterized in that, The lower wall of the flow channel plate (1) is provided with a plurality of hot air outlets (14) that communicate with the hot air channel (11). The spinneret (7) is provided with a hot air channel (73), which is connected to the hot air outlets (14) and the drawing air channel (82).

4. The air supply device for the meltblown fabric spinneret according to claim 3, characterized in that, The diameter of the hot air outlet (14) is smaller than the diameter of the hot air inlet (12).

5. The air supply device for the meltblown fabric spinneret according to claim 2, characterized in that, The distance between the air-guiding inclined surface (81) of the air duct plate (8) and the spinneret (72) of the spinneret plate (7) is 0.8 mm.

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