Nozzle mechanism and meltblown cloth mold

Abstract

The application provides a nozzle mechanism and a melt-blown cloth mold. The nozzle mechanism comprises a nozzle plate and two air knives. The nozzle plate is provided with a spinning orifice. The two air knives are connected with the nozzle plate. Each air knife and the nozzle plate jointly define an air jet channel. The spinning orifice is located between the two air jet channels. The sides of the two air jet channels are gathered to form a mixing channel which is communicated with the spinning orifice. Each air knife has an outer wall corresponding to the outlet side of the mixing channel. The outer wall is provided with a convex part. The two convex parts form a steady flow area. At least part of the outlet side is located in the steady flow area. The air flow interference is reduced, the uniformity of material distribution is improved, and the forming quality is improved.

Description

Technical Field

[0001] This invention relates to the field of mold manufacturing, and more specifically, to a nozzle mechanism and a meltblown fabric mold. Background Technology

[0002] Meltblown nonwoven fabric is primarily made of polypropylene (PP), which possesses excellent filtration, shielding, heat insulation, and oil absorption properties. It can be used in medical and hygiene applications such as surgical gowns, protective suits, sterilization wraps, masks, and diapers. It also performs well in industrial applications, serving as a filter material, insulation material, cement packaging bags, geotextiles, and covering fabrics. Meltblown nonwoven fabric is manufactured using a die-cutting process. The production process involves using high melt index raw materials (PP granules), heating and pressurizing them into a molten state through a screw extruder, then passing through a die. The melt is distributed through channels to the spinneret at the front of the nozzle, where it is extruded and then stretched by two converging high-speed, high-temperature airflows to refine the fibers. After passing through a certain height, the fibers are sprayed onto a splicing machine, where they cool and solidify onto a mesh screen to form the meltblown nonwoven fabric.

[0003] Research has revealed the following drawbacks of existing meltblown fabric molds:

[0004] The processing efficiency of molds for meltblown nonwoven fabrics is low. Summary of the Invention

[0005] The purpose of this invention is to provide a nozzle mechanism and a meltblown fabric mold that can improve processing efficiency.

[0006] The embodiments of the present invention are implemented as follows:

[0007] In a first aspect, embodiments of the present invention provide a nozzle mechanism, comprising:

[0008] The nozzle plate has a spinneret orifice, and the two air knives are connected to the nozzle plate. Each air knife and the nozzle plate together define an air jet channel. The spinneret orifice is located between the two air jet channels, and one side of the two air jet channels converges to form a mixing channel communicating with the spinneret orifice. Each air knife has an outer wall corresponding to the outlet side of the mixing channel. The outer wall has a protrusion, and a flow stabilization region is formed between the two protrusions. At least a portion of the outlet side is located in the flow stabilization region.

[0009] In an optional implementation, the protrusion extends along the extension direction of the mixing channel, and the length of the protrusion is not less than the length of the mixing channel, so that the outlet side is located in the steady flow region.

[0010] In an optional embodiment, the nozzle plate is provided with two first guide slopes, and the spinneret is located on the side of the two first guide slopes that are close to each other; each air knife is provided with a second guide slope, and the two second guide slopes correspond one-to-one with the two first guide slopes and are arranged at intervals to jointly define the air jet channel and the mixing channel.

[0011] In an optional embodiment, the side of the two protrusions that are close to each other is the guide side, and the guide side has a first included angle with the outer side.

[0012] In an optional implementation, the first included angle ranges from 130° to 140°.

[0013] In an optional embodiment, the first guide ramp has a second included angle with the outer side, and the first included angle and the second included angle are equal.

[0014] In an optional embodiment, the spinneret includes a plurality of spinneret holes spaced apart along the extension direction on the outlet side.

[0015] In an optional embodiment, the nozzle plate is further provided with a cavity having a constant width section and a variable width section, the variable width section being connected to the constant width section, the width of the variable width section gradually decreasing from one side closer to the constant width section to the other side, and the side of the variable width section away from the constant width section being connected to the spinneret.

[0016] In an optional embodiment, the air knife is provided with an air delivery channel and a connector. The connector is connected to the air delivery channel and is used to connect an external air delivery device. The air delivery channel is connected to the jet channel.

[0017] Secondly, embodiments of the present invention provide a meltblown fabric mold, the meltblown fabric mold comprising:

[0018] The nozzle mechanism of any of the foregoing embodiments.

[0019] The beneficial effects of the embodiments of the present invention are:

[0020] In summary, this embodiment provides a meltblown fabric mold. During operation, the raw material is heated and pressurized into a molten state by a screw extruder and then injected into the mold. It flows within the mold and reaches the spinneret on the nozzle plate. Simultaneously, high-pressure, high-temperature air is injected into two air jet channels. The raw material and air converge in the mixing channel. The raw material is stretched and refined by two converging high-speed, high-temperature airflows. After passing through a certain height, it is sprayed onto the mesh fabric splicing machine. The refined fibers cool and solidify to form meltblown fabric. Because the outer wall of the air knife corresponding to the outlet side of the mixing channel has protrusions, a stable flow zone is formed between the two protrusions. At least a portion of the outlet side is located within the stable flow zone. During raw material injection, the airflow in the stable flow zone is stable, and airflow outside the stable flow zone is less likely to enter. The raw material in the stable flow zone is less susceptible to interference from external airflow, allowing it to quickly reach the mesh fabric splicing machine, shortening the time for meltblown fabric to form on the machine and thus improving processing efficiency. Furthermore, the raw materials are less affected by external airflow when they are ejected, resulting in a more uniform distribution of raw materials on the mesh curtain splicing machine, thus improving the quality of meltblown fabric. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the nozzle mechanism according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A magnified view of the structure at point A in the diagram;

[0024] Figure 3 This is a schematic diagram of the nozzle plate according to an embodiment of the present invention;

[0025] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point B;

[0026] Figure 5 This is a schematic diagram of the air knife structure according to an embodiment of the present invention.

[0027] icon:

[0028] 100-Nozzle plate; 110-Main plate; 120-Conical section; 121-First guide slope; 130-Spinneret; 131-Spinneret hole; 140-Cavity; 141-Equal width section; 142-Variable width section; 150-Feed inlet; 200-Air knife; 201-Outer side; 202-Proximal side; 203-Inner side; 204-Far side; 210-Protrusion; 211-Guide side; 220-Air delivery channel; 230-Connector; 300-Air jet channel; 400-Mixing channel; 410-Outlet side; 500-Stable flow zone. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] During the operation of meltblown fabric molds, when material is ejected from the nozzle onto the splicing machine, the material cannot be evenly distributed, thus affecting the molding quality of the meltblown fabric product. The designers discovered during their research that the unstable airflow around the nozzle interfered with the material ejected from the nozzle, resulting in uneven material coating.

[0036] Please see Figures 1-5Therefore, this embodiment provides a meltblown fabric mold, which improves the uneven material spraying by improving the structure of the meltblown fabric mold, thereby improving the molding quality of the product and increasing the processing efficiency.

[0037] Please see Figure 1 and Figure 2 In this embodiment, the meltblown fabric mold includes a nozzle plate 100 and two air knives 200. The nozzle plate 100 is provided with a spinneret 130. Both air knives 200 are connected to the nozzle plate 100, and each air knife 200 and the nozzle plate 100 together define an air jet channel 300. The spinneret 130 is located between the two air jet channels 300, and one side of the two air jet channels 300 converges to form a mixing channel 400 communicating with the spinneret 130. Each air knife 200 has an outer wall corresponding to the outlet side 410 of the mixing channel 400. The outer wall is provided with a protrusion 210, and a flow stabilization region 500 is formed between the two protrusions 210. At least a portion of the outlet side 410 is located in the flow stabilization region 500.

[0038] In the meltblown fabric mold provided in this embodiment, during operation, the raw material is heated and pressurized into a molten state by a screw extruder and then injected into the mold. It flows in the mold and reaches the spinneret 130 on the nozzle plate 100. While being extruded from the spinneret 130, high-pressure and high-temperature air is injected into the two air jet channels 300. The raw material and air converge at the mixing channel 400. The raw material is stretched and refined by two converging high-speed, high-temperature airflows. After passing through a certain height, it is sprayed onto the mesh curtain splicing machine device. The refined fibers cool and solidify to form meltblown fabric. Because the air knife 200 has protrusions 210 on its outer wall corresponding to the outlet side 410 of the mixing channel 400, a stable flow region 500 is formed between the two protrusions 210. At least a portion of the outlet side 410 is located in the stable flow region 500. During raw material injection, the airflow in the stable flow region 500 is stable, and airflow outside the stable flow region 500 is unlikely to enter it. The raw material in the stable flow region 500 is less affected by external airflow, allowing it to quickly reach the mesh curtain splicing machine, shortening the time for forming meltblown fabric on the mesh curtain splicing machine, thereby improving processing efficiency. Furthermore, the raw material is less affected by external airflow during ejection, resulting in a more uniform distribution of raw material reaching the mesh curtain splicing machine, thus improving the quality of the meltblown fabric.

[0039] Please see Figure 3 and Figure 4In this embodiment, optionally, the nozzle plate 100 includes a main plate portion 110 and a conical portion 120. The main plate portion 110 may be cuboid in shape, and the conical portion 120 may be a trapezoidal cone. The conical portion 120 is disposed on a long side of the main plate portion 110, and the lower base of the conical portion 120 is connected to the main plate portion 110. The conical portion 120 extends along the length direction of the main plate portion 110, and the two opposite inclined surfaces of the conical portion 120 are designated as first guide inclined surfaces 121. The distance between the two first guide inclined surfaces 121 gradually decreases from the side closer to the main plate portion 110 to the side farther away from the main plate portion 110.

[0040] Furthermore, the tapered portion 120 is located at the middle position in the width direction of the main body plate portion 110.

[0041] In this embodiment, optionally, the main body plate 110 and the tapered part 120 are integrally formed, which has a compact structure, is easy to process and manufacture, and has high strength and long service life.

[0042] Optionally, a feed inlet 150 is provided on the side of the main plate portion 110 opposite to the conical portion 120, and a spinneret 130 is provided on the upper bottom of the conical portion 120, that is, on the side of the conical portion 120 opposite to the main plate portion 110. A cavity 140 for material flow is provided between the feed inlet 150 and the spinneret 130, and both the feed inlet 150 and the spinneret 130 are connected to the cylinder cavity; it should be noted that the cavity 140 extends from the main plate portion 110 all the way to the conical portion 120.

[0043] Please combine Figure 2 Furthermore, the cavity 140 is provided with a constant width section 141 and a variable width section 142. The variable width section 142 is connected to the constant width section 141. The width of the variable width section 142 gradually decreases from the side closest to the constant width section 141 to the other side. The side of the variable width section 142 away from the constant width section 141 is connected to the spinneret 130. The constant width section 141 is connected to the feed inlet 150.

[0044] Please see Figure 4 Furthermore, the spinneret 130 includes a plurality of spinneret holes 131, which may be, but are not limited to, cylindrical holes. The plurality of spinneret holes 131 are evenly spaced along the extension direction of the spinneret groove. The plurality of spinneret holes 131 are all connected to the side of the variable width section 142 of the cavity 140 away from the constant width section 141.

[0045] In other words, after the material fed into the cavity 140 from the feed inlet 150, it first flows into the widening section 142 from the equal width section 141 of the cavity 140, then enters the spinneret 131 from the widening section 142, and finally exits from the spinneret 131.

[0046] Please see Figure 5 and combination Figure 1In this embodiment, optionally, each air knife 200 is elongated, and the outer peripheral surface of each air knife 200 includes an outer side 201, a proximal side 202, an inner side 203, and a distal side 204 connected in sequence. The proximal side 202 and the distal side 204 are arranged opposite to each other and parallel to each other, and the distal side 204 is the outer side of the air duct. The inner side 203 is a slope, that is, the inner side 203 has an obtuse angle with the proximal side 202 or an acute angle with the distal side 204. This angle can be set as needed, and is not specifically limited in this embodiment. In addition, the inner side 203 can be referred to as the second guiding slope. The second guiding slope cooperates with the first guiding slope 121, and there is a gap between the two so that they jointly define the jet duct 300. Moreover, on both sides of the extension direction of the inner side 203, the inner side 203 is sealed with the nozzle plate 100, thereby preventing airflow leakage from both sides of the extension direction of the inner side 203.

[0047] Meanwhile, a protrusion 210 is provided on the distal side 204. The protrusion 210 is strip-shaped and extends along the intersection of the inner side 203 and the distal side 204. That is, the extension direction of the protrusion 210 is the length direction of the air knife 200. Optionally, the length of the protrusion 210 is not less than the length of the spinneret 130, so that the outlet side 410 of the mixing channel 400 is located in the flow stabilization region 500 defined by the two protrusions 210.

[0048] Optionally, the side of the protrusion 210 away from the distal side 204 is parallel to the distal side 204, and the side of the protrusion 210 near the inner side 203 is a guide side 211. The guide side 211 is a slope, and the guide side 211 has a first included angle α with the distal side 204. The range of the first included angle α is 130°-140°, for example, the first included angle α is 130°, 135° or 140°, etc.

[0049] Correspondingly, the angle between the first guide slope 121 and the distal side 204 is the second included angle β, which ranges from 130° to 140°. For example, the first included angle α is 130°, 135°, or 140°. Optionally, the first included angle α and the second included angle β can be designed to be equal to enhance the stability of the airflow in the steady flow region 500.

[0050] Furthermore, the air knife 200 is provided with an air supply channel 220 and a connector 230. One end of the air supply channel 220 is located on the outer side 201, and the other end is located on the proximal side 202 and communicates with the jet channel 300. The connector 230 is located on the outer side 201 and communicates with the air supply channel 220. The connector 230 is used to connect high-temperature and high-pressure gas.

[0051] In the nozzle mechanism provided in this embodiment, both air knives 200 are connected to the nozzle plate 100. During assembly, the two air knives 200 are respectively connected to the main body plate 110 and located on both sides of the conical portion 120. When the air knives 200 are connected to the main body plate 110, the proximal side 202 of the air knives 200 fits against the longitudinal plate surface of the main body plate 110 and achieves a sealed connection. The width of the air jet channel 300 gradually decreases from the proximal side 202 to the distal side 204. A flow stabilization region 500 is defined between the two protrusions 210. The mixing channels 400 are all located in the flow stabilization region 500. That is, the mixed material sprayed from the mixing channels 400 is within the protection range of the flow stabilization region 500, thereby making the material sprayed on the fabric splicer more evenly distributed and the product forming quality higher.

[0052] It should be noted that the air knife 200 and the main body plate 110 can be fixedly connected by screws. Obviously, in other embodiments, the air knife 200 and the main body plate 110 can be fixedly connected by other methods.

[0053] The nozzle mechanism provided in this embodiment has minimal interference from the surrounding airflow when the material is sprayed out from the outlet side 410 of the mixing channel 400, resulting in uniform material distribution on the splicing machine and high product molding quality.

[0054] This embodiment also provides a meltblown fabric mold, including the nozzle mechanism described in the above embodiment. The meltblown fabric mold is reasonably designed, and the processed products have high quality and high processing efficiency.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A nozzle mechanism, characterized in that, It includes: The nozzle plate includes a nozzle plate with a spinneret orifice. Both air knives are connected to the nozzle plate, and each air knife and the nozzle plate together define an air jet path. The spinneret orifice is located between the two air jet paths, and one side of each air jet path converges to form a mixing channel communicating with the spinneret orifice. Each air knife has an outer wall corresponding to the outlet side of the mixing channel, and the outer wall has a protrusion. A flow stabilization region is formed between two protrusions, and at least a portion of the outlet side is located within the flow stabilization region. The nozzle plate is provided with two first guide slopes, and the spinneret is located on the side of the two first guide slopes that are close to each other; each air knife is provided with a second guide slope, and the two second guide slopes correspond one-to-one with the two first guide slopes and are arranged at intervals to jointly define the air jet channel and the mixing channel; The side where the two protrusions are close to each other is the guide side; Each of the air blades has an outer peripheral surface comprising an outer side, a proximal side, an inner side, and a distal side connected in sequence. The proximal side and the distal side are arranged opposite to each other and parallel to each other. The inner side has an obtuse angle with the proximal side or an acute angle with the distal side. The guide side has a first included angle with the distal side, the first included angle being in the range of 130°-140°. The first guide slope has a second included angle with the distal side, the second included angle being in the range of 130°-140°. The first included angle and the second included angle are equal.

2. The nozzle mechanism according to claim 1, characterized in that: The protrusion extends along the extension direction of the mixing channel, and the length of the protrusion is not less than the length of the mixing channel, so that the outlet side is located in the steady flow region.

3. The nozzle mechanism according to claim 1, characterized in that: The spinneret includes a plurality of spinneret holes spaced apart along the extension direction of the outlet side.

4. The nozzle mechanism according to claim 1, characterized in that: The nozzle plate is also provided with a cavity, which has a constant width section and a variable width section. The variable width section is connected to the constant width section. The width of the variable width section gradually decreases from one side closer to the constant width section to the other side. The side of the variable width section away from the constant width section is connected to the spinneret.

5. The nozzle mechanism according to claim 1, characterized in that: The air knife is equipped with an air delivery channel and a connector. The connector is connected to the air delivery channel and is used to connect to external air delivery equipment. The air delivery channel is connected to the jet channel.

6. A meltblown fabric mold, characterized in that, The meltblown fabric mold includes: The nozzle mechanism according to any one of claims 1-5.

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