An extrusion nozzle for meltblown cloth production

Abstract

The application provides an extrusion nozzle for melt-blown cloth production and belongs to the technical field of mask processing. The nozzle comprises a body, a molten liquid cavity in the body, a liquid inlet groove above the body and a discharge groove below the body. The liquid inlet groove and the discharge groove are respectively located on the upper and lower sides of the molten liquid cavity. The body further has two air blowing cavities respectively located on the two sides of the molten liquid cavity. The lower ends of the two air blowing cavities have air outlet grooves connected with the molten liquid cavity. A screw rod is rotatably connected between the two air outlet grooves on the body. The screw rod blocks the discharge groove, and the screw rod has a spiral-shaped material groove outside. The application has the advantages of low maintenance cost.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mask processing, and relates to an extrusion nozzle for melt-blown cloth production. BACKGROUND

[0002] The melt-blown cloth serving as a mask filter layer is formed by spraying polypropylene master batch after hot melting, and is formed into a micrometer-level filamentous fiber by spraying the high-pressure gas-liquid mixture formed by hot air and hot melt liquid from the mesh hole of the filament-forming filter screen. Generally, at least two sets of extrusion nozzles are required for a melt-blown cloth processing system to facilitate cleaning and replacement, because the filament-forming filter screen of the nozzle is prone to blockage, and the nozzle needs to be disassembled and cleaned with high-temperature cleaning liquid, which adversely affects the continuity and efficiency of processing. SUMMARY

[0003] The application aims to solve the above problems of the prior art, and provides an extrusion nozzle for melt-blown cloth production.

[0004] The application can be implemented by the following technical scheme: an extrusion nozzle for melt-blown cloth production, characterized by comprising a body, a melt cavity in the body, a liquid inlet groove above the body, and a discharge groove below the body, wherein the liquid inlet groove and the discharge groove are respectively located on the upper and lower sides of the melt cavity, the body further has two air blowing cavities respectively located on the two sides of the melt cavity, the lower ends of the two air blowing cavities have air outlet grooves communicating with the melt cavity, a lead screw is rotatably connected to the body between the two air outlet grooves, the lead screw blocks the discharge groove, and the lead screw has a spiral-shaped discharge groove outside.

[0005] Further, the end of the body has two air inlet connecting pipes corresponding to the air blowing cavities.

[0006] Further, the body has a mounting lug.

[0007] Further, the middle part of the lead screw has a heating wire.

[0008] Further, the two side walls of the discharge groove in contact with the outer wall of the lead screw form an inclination angle of 50-130°.

[0009] The present scheme uses a lead screw instead of the micro-hole screen plate in the prior art, and the material groove on the lead screw and the side plate in contact with the outer wall of the lead screw form a discharge micro-hole that limits the discharge space. This method has at least the following technical features superior to the prior art: 1. The entry position and the discharge position of the material groove on the lead screw are located on the upper and lower sides of the tangent position of the lead screw and the side plate, that is, the entry position is large and gradually decreases, while the discharge position is large and gradually increases. The space between the entry grooves can be used to accumulate and pressurize the material, and the micro-limit position formed after leaving the groove can quickly separate from the lead screw, reducing the contact between the lead screw and the extruded material and reducing the probability of material accumulation on the exposed part of the lead screw; 2. The lead screw is a rotating member driven by hydraulic force on both sides. The lead screw with a spiral groove has a random self-rotation. However, since the lead screw is a symmetrical structure on both sides, the torque generated by the force on the spiral groove of the lead screw is opposite and comparable in intensity. Therefore, the rotation of the lead screw cannot be fast. The present scheme utilizes the small differences and fluctuations in hydraulic force on both sides of the lead screw to achieve random self-rotation of the lead screw, and further enables the lead screw with a spiral discharge groove to clean the side wall of the discharge groove, preventing the still solidified material from causing blockage in the discharge area; 3. The spiral discharge groove on the lead screw can guide the liquid flow. Since the inclination directions of the discharge grooves on both sides of the lead screw are opposite, the filaments sprayed from both sides of the lead screw intersect each other, making the filaments after spraying present a woven shape rather than a parallel fiber shape; 4. The heating wire can prevent the solidification of the material accumulated in the discharge area, further extending the maintenance cycle. At the same time, the heating wire can melt the originally solidified material during start-up and shutdown without the need to disassemble and clean. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 Figure 1 is a structural schematic diagram of the present extrusion nozzle.

[0011] Figure 2 Figure 2 is a partial sectional view of the present extrusion nozzle.

[0012] Figure 3 Figure 3 is an enlarged view of part A in Figure 1. Figure 2

[0013] Figure 4 is an enlarged view of part B in Figure 1. Figure 4

[0014] Figure 5 is a structural schematic diagram of the lead screw. Figure 5 Figure 4 Figure 6 is an enlarged view of part B in Figure 5.

[0015] DETAILED DESCRIPTION

[0016] The following is a specific embodiment of the present invention and further describes the technical scheme of the present invention in conjunction with the drawings, but the present invention is not limited to these embodiments.​​

[0017] As Figures 1-5 shown, the melt-blowing cloth production extrusion nozzle includes a body 1, a melt cavity 2 in the body 1, a liquid inlet groove 3 above the body 1 and a discharge groove 4 below the body 1, the liquid inlet groove 3 and the discharge groove 4 are respectively located on the upper and lower sides of the melt cavity 2, the body 1 also has two air blowing cavities 5 respectively located on both sides of the melt cavity 2, the lower ends of the two air blowing cavities 5 have air outlet grooves 6 communicating with the melt cavity 2, between the two air outlet grooves 6 there is a screw rod 7 rotatingly connected to the body 1, the screw rod 7 blocks the discharge groove 4, and the screw rod 7 has a spiral-shaped material groove 8 outside.

[0018] The end of the body 1 has two air inlet connecting pipes 9 respectively corresponding to the air blowing cavities 5 to introduce hot air flow, the hot air flow extrudes the liquid material from the air outlet grooves 6, so that it is extruded from the tangent position of the screw rod 7 and the side wall of the body 1, it can be seen that the air blowing cavities 5 almost surround the melt cavity 2, which has a heat preservation effect on the material in the melt cavity 2.

[0019] The body 1 has a mounting lug 10 for mounting the nozzle.

[0020] The middle part of the screw rod 7 has a heating wire 11, the temperature of the heating wire 11 is adjustable and controllable.

[0021] The two side walls of the discharge groove 4 in contact with the outer wall of the screw rod 7 form an inclination angle of 50-130°.

[0022] The scheme uses a lead screw 7 to replace the micro-hole screen plate in the prior art. The material groove 8 on the lead screw 7 and the side plate in contact with the outer wall of the lead screw 7 form a limited discharge micro-hole. This method has at least the following technical features superior to the prior art: 1. The entry position and discharge position of the material groove 8 on the lead screw 7 are respectively located on the upper and lower sides of the tangent position of the lead screw 7 and the side plate, that is, the entry position is large and gradually decreases, while the discharge position is large and gradually increases. The space between the entry material grooves 8 can be used to accumulate and pressurize the material, and the micro-limit position formed after leaving the material groove 8 can quickly separate from the lead screw 7, reducing the contact between the lead screw 7 and the extruded material and reducing the probability of material accumulation on the exposed part of the lead screw 7; 2. The lead screw 7 is a rotating member driven by hydraulic force on both sides. The lead screw 7 with spiral grooves 8 has random self-rotation. Of course, since the lead screw 7 is symmetrical on both sides, the torque formed by the force on the spiral grooves 8 on the lead screw 7 is opposite and comparable in intensity. Therefore, the rotation of the lead screw 7 cannot be fast. The scheme uses the small difference and fluctuation of the hydraulic force on both sides of the lead screw 7 to realize the random self-rotation of the lead screw 7, and further enables the lead screw 7 with spiral discharge grooves 4 to clean the side wall of the discharge groove 4, preventing the still solidified material from causing blockage in the discharge area; 3. The spiral discharge grooves 4 on the lead screw 7 can guide the flow. Since the inclined directions of the discharge grooves 4 on both sides of the lead screw 7 are opposite, the filaments sprayed from both sides of the lead screw 7 are interlaced, making the filaments after spraying present a woven shape rather than a parallel fiber shape; 4. The heating wire 11 can prevent the solidification of the material accumulated in the discharge area, further extending the maintenance cycle, and can also melt the originally solidified material during start and stop without the need to disassemble and clean.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. An extrusion nozzle for meltblown fabric production, characterized in that, The device includes a body (1), a molten liquid chamber (2) located inside the body (1), an inlet groove (3) located above the body (1), and an outlet groove (4) located below the body (1). The inlet groove (3) and the outlet groove (4) are located on the upper and lower sides of the molten liquid chamber (2), respectively. The body (1) also has two blower chambers (5) located on both sides of the molten liquid chamber (2). The lower ends of the two blower chambers (5) have an outlet groove (6) that connects to the molten liquid chamber (2). A screw (7) is rotatably connected to the body (1) between the two outlet grooves (6). The screw (7) blocks the outlet groove (4). The screw (7) has a spiral material groove (8) outside. The material groove (8) on the screw (7) and the side plate that contacts the outer wall of the screw (7) form a discharge micro-hole that restricts the discharge space; the entry position and discharge position of the material groove (8) on the screw (7) are located on the upper and lower sides of the position where the screw (7) is tangent to the side plate, respectively; the screw (7) is subject to the slight difference and fluctuation of the hydraulic force on both sides to achieve random self-rotation.

2. The extrusion nozzle for meltblown fabric production according to claim 1, characterized in that, The end of the body (1) has two air inlet pipes (9) that correspond to the blower cavity (5) respectively.

3. The extrusion nozzle for meltblown fabric production according to claim 1, characterized in that, The main body (1) has mounting lugs (10).

4. An extrusion nozzle for meltblown fabric production according to claim 1, 2, or 3, characterized in that, The lead screw (7) has a heating wire (11) in the middle.

5. An extrusion nozzle for meltblown fabric production according to claim 1, 2, or 3, characterized in that, The two side walls of the discharge trough (4) that are in contact with the outer wall of the screw (7) are inclined at an angle of 50 to 130°.

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