Melt-blowing spinneret plate with multiple rows of holes

Abstract

The invention relates to the field of spinneret plates, in particular to a multi-row-hole melt-blowing spinneret plate which is formed by sequentially stacking a feeding plate, a distributing plate and a spinneret plate body, and the spinneret plate body is formed by assembling and stacking an upper spinneret plate body, a middle spinneret plate body and a lower spinneret plate body; a melt cavity is formed in the top of the upper spinneret plate, a plurality of spinneret columns are arranged at the bottom of the melt cavity in a communicating mode and penetrate through the middle spinneret plate and the lower spinneret plate, and an upper pressure stabilizing cavity communicated with the air duct is formed in the bottom of the upper spinneret plate. According to the multi-row-hole melt-blowing mechanism composed of the feeding plate, the distribution plate and the spinneret plate, melt-blowing of non-woven fabric can be achieved, airflow can be evenly distributed through the pressure stabilizing flow channel so as to guarantee the uniformity of the airflow sprayed out of the air nozzles around the conical spray head, uniform distribution of melt can be achieved through the distribution plate, and the uniformity of the melt can be guaranteed. The device is simple in structure and good in control over the uniformity of melt and airflow, and the productivity is improved compared with a conventional melt-blowing technology.

Description

Technical Field

[0001] This invention relates to the field of spinneret technology, and more particularly to multi-row perforated melt-blown spinnerets. Background Technology

[0002] Meltblown nonwoven fabric technology is a process in which a high molecular polymer is heated, melted, and extruded through a screw extruder, and then extruded through the spinneret of a meltblown die to form a fine stream. The stream is then stretched, cooled, and solidified by high-speed, high-temperature airflows on both sides, and finally condensed into a web on a receiving device.

[0003] Currently, the industry commonly uses single-row spinnerets, where all spinnerets are arranged in a single straight line. This design is simple and the technology is mature. However, only a single row of holes can produce filament, limiting production capacity. To address this issue, multi-row spinnerets have emerged. By increasing the number of rows of spinnerets, the number of holes can be significantly increased within a limited plate length, thereby improving production capacity. However, the multi-row structure makes the internal melt distribution and external drafting airflow field of the spinneret extremely complex, resulting in significantly higher processing difficulty and making it difficult to control the uniformity of the melt and airflow fields. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-row perforated meltblown spinneret.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A multi-row perforated meltblown spinneret includes a feed plate, a distribution plate and a spinneret stacked in sequence. The spinneret is composed of an upper spinneret plate, a middle spinneret plate and a lower spinneret plate assembled and stacked. The top of the upper spinneret is provided with a melt chamber, and the bottom of the melt chamber is connected to multiple spinnerets. The spinnerets all pass through the middle spinneret and the lower spinneret, and the bottom of the upper spinneret is provided with an upper pressure stabilizing chamber connected to a ventilation channel. The spinneret has multiple vertically penetrating cavities, and a lower pressure stabilizing cavity communicating with the vertical cavities is opened at the bottom of the spinneret. The upper pressure stabilizing cavity, the vertical cavity and the lower pressure stabilizing cavity are adapted to be connected to form a pressure stabilizing flow channel. The bottom of each spinneret is provided with a conical nozzle, and a conical cavity is provided on the lower spinneret outside the conical nozzle. The conical cavity is adapted to and connected with the lower pressure stabilizing cavity, and multiple air jets are opened at the bottom of the conical cavity.

[0006] In addition, a preferred structure is that the feed plate has multiple feed chambers vertically penetrating through the middle, and multiple air ducts for air intake are vertically penetrating through both sides of the feed plate.

[0007] In addition, preferably, a distribution cavity is formed in the middle of the distribution plate below the feeding cavity, and a plurality of middle air channels are vertically formed on both sides of the distribution plate and communicate with the upper air channel.

[0008] In addition, preferably, a melt cavity is formed in the middle of the spinning upper plate and communicates with the distribution cavity, a plurality of lower air channels are formed on both sides of the spinning upper plate and communicate with the middle air channel, and the lower air channels communicate with the upper pressure stabilizing cavity.

[0009] In addition, preferably, a plurality of rows of spinning columns are fixedly arranged on the bottom of the melt cavity, a spinning cavity is formed in each of the spinning columns and communicates with the melt cavity, and each row of the spinning columns comprises six spinning columns.

[0010] In addition, preferably, a plurality of vertical upper through holes and lower through holes are formed in the spinning middle plate and the spinning lower plate, respectively, and the spinning columns pass through the upper through holes and the lower through holes.

[0011] In addition, preferably, the conical nozzles are inserted into the lower through holes, a spinning groove is formed on the bottom of the spinning lower plate outside the lower through holes, and the conical nozzles extend out of the spinning groove.

[0012] In addition, preferably, the upper through holes are in sealing contact with the spinning columns, the lower through holes are conical and have a size larger than that of the conical nozzles, and when the conical nozzles are inserted into the lower through holes, a conical cavity is formed between the lower through holes and the conical nozzles.

[0013] In addition, preferably, the lower through holes communicate with the lower pressure stabilizing cavity, and when the conical cavity is formed, an annular air outlet is formed on the outside of the conical nozzles.

[0014] In addition, preferably, the feeding plate, the distribution plate, the spinning upper plate, the spinning middle plate and the spinning lower plate are sequentially connected and assembled by screws.

[0015] The present application has the following advantages: the multi-row hole melt blowing mechanism composed of the feeding plate, the distribution plate and the spinning plate can realize melt blowing non-woven fabric, the uniform distribution of airflow can be realized by the pressure stabilizing flow channel, the uniform distribution of melt can be realized by the distribution plate, the device has a simple structure and good control of the uniformity of melt and airflow, and the production capacity is improved compared with conventional melt blowing technology. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure of the multi-row hole melt blowing spinning plate according to the present application is shown in the figure; Figure 2 The structure of the multi-row hole melt blowing spinning plate according to the present application is shown in the figure; Figure 1 The structure of the multi-row hole melt blowing spinning plate according to the present application is shown in the figure; Figure 3 is an exploded structural schematic view of the device in Figure 1 ; Figure 4 is an exploded structural schematic view of the device in Figure 1 ; Figure 5 is an enlarged detail view of the spinneret in Figure 4 ; Figure 6 is an enlarged detail view of the pressure stabilizing flow channel and conical nozzle in Figure 5 .

[0017] In the figure: 1 is a feed plate, 11 is a feed cavity, 12 is an upper air channel, 2 is a distribution plate, 21 is a distribution cavity, 22 is a middle air channel, 3 is an upper spinneret plate, 31 is a melt cavity, 311 is a spinneret column, 312 is a conical nozzle, 313 is a spinneret cavity, 32 is a lower air channel, 33 is an upper pressure stabilizing cavity, 4 is a middle spinneret plate, 41 is an upper through hole, 42 is a vertical cavity, 43 is a lower pressure stabilizing cavity, 5 is a lower spinneret plate, 51 is a lower through hole, 52 is a spinneret groove, 53 is a conical cavity, 531 is a gas outlet. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0019] With reference to Figures 1-6 , the device comprises a feed plate 1, a distribution plate 2, and a spinneret plate stacked and spliced together, the spinneret plate further comprises an upper spinneret plate 3, a middle spinneret plate 4, and a lower spinneret plate 5 stacked and spliced together, and they are all spliced together by screws. After splicing is completed, various flow channels corresponding to each other are in communication, and sealing members are arranged at the communication positions to ensure sealing.

[0020] When the device is spinning, the melt is output by an extruder and then input into the feed cavity 11 through a pipeline in communication, and the drawing air is output by a high-pressure air pump and then input into the upper air channel 12 through a pipeline. In this way, the supply of the melt and the drawing air can be realized, which is a prior art and thus will not be described in detail.

[0021] Among them, a plurality of feed cavities 11 are vertically and longitudinally arranged in the middle of the feed plate 1, a distribution cavity 21 is arranged below the feed cavities 11 in the middle of the distribution plate 2, and a melt cavity 31 in communication with the distribution cavity 21 is arranged in the middle of the upper spinneret plate 3. In this way, after the melt enters the feed cavity 11, it flows into the distribution cavity 21 for distribution, and then flows evenly into the melt cavity 31 after the distribution is completed.

[0022] The reason for setting the distribution plate 2 is that the melt blowing process has very high requirements for the uniformity of the melt. Any slight inconsistency in temperature, pressure or flow rate will directly cause serious quality problems such as uneven thickness, strength difference, and fluctuation of filtration efficiency in the final produced melt-blown non-woven fabric. Therefore, through the setting of the distribution plate 2, the melt from the feed plate 1 can be evenly distributed to the entire melt cavity 31 without dead angle, no stagnation, equal pressure and equal speed, and then evenly distributed to the spinneret plate. It is worth noting that the specific distribution channel of the distribution plate 2 is prior art, so it is not described in detail. And a filter screen can be installed between the feed plate 1 and the distribution plate 2 to filter the incoming melt.

[0023] The bottom of the melt cavity 31 is fixedly provided with a plurality of rows of spinneret columns 311, the inside of each spinneret column 311 is provided with a spinneret cavity 313 communicating with the melt cavity 31, and the bottom of the spinneret column 311 is fixedly provided with a conical nozzle 312. In the melt blowing process, the melt in the melt cavity 31 can enter the spinneret cavity 313 through the spinneret column 311, and then the melt is sprayed out of the spinneret cavity 313 through the conical nozzle 312.

[0024] Each row of spinneret columns 311 is six, which has sufficient spinning efficiency and can ensure that the melt and airflow can be supplied in sufficient amount.

[0025] Among them, the two sides of the feed plate 1 are vertically through and provided with a plurality of upper air ducts 12 for air inlet, the two sides of the distribution plate 2 are vertically through and provided with a plurality of middle air ducts 22 communicating with the upper air ducts 12, and the two sides of the spinneret upper plate 3 are provided with a plurality of lower air ducts 32 communicating with the middle air ducts 22. Through the adaptive communication between the upper air ducts 12, the middle air ducts 22 and the lower air ducts 32, an air inlet channel is formed to supply air flow in the subsequent process.

[0026] Among them, the lower air duct 32 is in adaptive communication with the pressure stabilizing channel, and through the setting of the pressure stabilizing channel, the air flow supplied in the air duct can be stably distributed to ensure that the air flow output in the final melt blowing process can be evenly distributed to the outside of each conical nozzle 312.

[0027] The pressure stabilizing channel includes an upper pressure stabilizing cavity 33, a vertical cavity 42 and a lower pressure stabilizing cavity 43 in communication, and the upper pressure stabilizing cavity 33 is provided in the bottom of the spinneret upper plate 3 and communicates with the lower air duct 32. The vertical cavity 42 is vertically through and provided on the spinneret middle plate 4, and the bottom of the spinneret middle plate 4 is provided with a lower pressure stabilizing cavity 43 communicating with the vertical cavity 42.

[0028] In the process of gas supply, the gas flow enters into the upper pressure stabilization chamber 33 from the lower air duct 32, then the gas flow in the upper pressure stabilization chamber 33 enters into the lower pressure stabilization chamber 43 through the vertical chamber 42, and finally the gas flow in the lower pressure stabilization chamber 43 is sprayed out through the jet port 531 at the end of the conical chamber 53. Through this gas distribution mode, the gas flow in all jet ports 531 can be uniformly sprayed out.

[0029] The upper pressure stabilization chamber 33 has a relatively large volume. According to the principle of fluid mechanics, a large enough volume can produce significant damping and smoothing effect on the gas flow. By collecting and mixing the gas flow input in the air duct in the upper pressure stabilization chamber 33, the pressure of the gas flow in the upper pressure stabilization chamber 33 can be preliminarily balanced.

[0030] The vertical chambers 42 are vertically arranged chambers, and all the vertical chambers 42 are completely identical in geometric size (the same length, cross-sectional area and inner wall smoothness). This means that the flow resistance of each vertical chamber 42 to the gas flow is consistent. According to the principle of parallel pipeline flow distribution, when the resistances of multiple parallel channels are the same, the total flow upstream will be automatically evenly distributed to each channel. Therefore, through the arrangement of the vertical chamber 42, the gas flow in the upper pressure stabilization chamber 33 can be uniformly delivered to the lower pressure stabilization chamber 43.

[0031] Through the arrangement of the lower pressure stabilization chamber 43, the uniformity of the gas pressure in the chamber can be further compensated to ensure the uniformity of the gas pressure everywhere.

[0032] Among them, the upper middle plate 4 and the lower middle plate 5 are respectively provided with a plurality of vertical through holes 41 and 51, and the jet columns 311 are adapted to pass through the upper through holes 41 and the lower through holes 51. The upper through holes 41 are in sealing contact with the jet columns 311, the conical nozzles 312 are adapted to be inserted and installed in the lower through holes 51, the lower through holes 51 are conical and larger than the conical nozzles 312, and the lower through holes 51 are adapted to communicate with the lower pressure stabilization chamber 43. When the conical nozzles 312 are inserted into the lower through holes 51, the lower through holes 51 and the conical nozzles 312 form a conical chamber 53, and the bottom of the conical chamber 53 is located outside the conical nozzles 312 to form an annular jet port 531. At this time, the gas flow in the lower pressure stabilization chamber 43 can be sprayed out from the jet port 531 after passing through the conical chamber 53.

[0033] Among them, the bottom of the lower middle plate 5 is provided with a jet recess 52 outside the lower through hole 51, and the conical nozzles 312 are adapted to extend out of the jet recess 52.

[0034] In this embodiment, the feeding plate 1, the distribution plate 2, the upper jet plate 3, the middle jet plate 4 and the lower jet plate 5 are stacked and spliced by screws. When the device is jetting, the melt is output from the extruder and input into the feeding chamber 11 through the pipeline, and the drawing air is output by the high-pressure air pump and input into the upper air duct 12 through the pipeline.

[0035] The melt in the feeding cavity 11 passes through the distribution cavity 21 and enters into the melt cavity 31, so that the melt can be evenly fed into the melt cavity 31 through the distribution cavity 21. Then the melt in the melt cavity 31 enters into the spinning cavity 313 in the spinning column 311, and finally the melt is sprayed out through the conical nozzle 312.

[0036] Further, the air flow entering from the upper air duct 12 enters into the upper pressure stabilizing cavity 33 through the middle air duct 22 and the lower air duct 32 in sequence, and then the air flow is stabilized and balanced in the upper pressure stabilizing cavity 33. Then the air flow enters into the lower pressure stabilizing cavity 43 through the vertical cavity 42 to further stabilize and balance, and finally the air flow enters into the conical cavity 53 and is sprayed out through the air outlet 531, so that the air flow sprayed out can cause traction and stretching force to the melt sprayed out from the conical nozzle 312, so as to instantaneously stretch and thin the fiber by tens or even hundreds of times, so as to achieve micron level and realize melt blowing.

[0037] Further, the lower through hole 51 is in adaptive communication with the lower pressure stabilizing cavity 43, and the lower through hole 51 is conical and has a size larger than the conical nozzle 312. This makes the upper through hole 41 be blocked by the spinning column 311 when the spinning column 311 is inserted into the upper through hole 41 and the lower through hole 51, and the conical nozzle 312 is inserted into the lower through hole 51, so that the conical cavity 53 is formed between the conical nozzle 312 and the lower through hole 51. This makes the air flow in the lower pressure stabilizing cavity 43 enter into the conical cavity 53, and finally be evenly sprayed out from the air outlet 531 at the bottom thereof.

[0038] In the present application, the melt blowing non-woven fabric can be realized through the multi-row hole melt blowing mechanism composed of the feeding plate 1, the distribution plate 2 and the spinning plate, the air flow can be evenly distributed through the pressure stabilizing flow channel to ensure the uniformity of the air flow sprayed out from the air outlets 531 around the conical nozzle 312, and the melt can be evenly distributed through the distribution plate 2. The device has a relatively simple structure, and the uniformity of the melt and the air flow is well controlled, and the production capacity is improved compared with the conventional melt blowing technology.

[0039] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. Multi-row hole melt-blowing spinneret comprising a feed plate (1), a distribution plate (2) and a spinneret stacked in this order, characterized in that, The spinneret comprises a spinneret upper plate (3), a spinneret middle plate (4) and a spinneret lower plate (5) assembled and stacked; The top of the spinneret upper plate (3) is provided with a melt cavity (31), the bottom of the melt cavity (31) is provided with a plurality of spinneret columns (311) in communication, the spinneret columns (311) all pass through the spinneret middle plate (4) and the spinneret lower plate (5), and the bottom of the spinneret upper plate (3) is provided with an upper pressure stabilizing cavity (33) in communication with the air channel; The spinneret middle plate (4) is provided with a plurality of vertical through-standing cavities (42), the bottom of the spinneret middle plate (4) is provided with a lower pressure stabilizing cavity (43) in communication with the standing cavities (42), and the upper pressure stabilizing cavity (33), the standing cavities (42) and the lower pressure stabilizing cavity (43) are adapted to communicate to form a pressure stabilizing flow channel; The bottom of the spinneret column (311) is provided with a conical nozzle (312), the outer side of the conical nozzle (312) on the spinneret lower plate (5) is provided with a conical cavity (53), the conical cavity (53) and the lower pressure stabilizing cavity (43) are adapted to communicate, and the bottom of the conical cavity (53) is provided with a plurality of air outlets (531).

2. The multirow orifice meltblown die of claim 1 wherein, The middle of the feeding plate (1) is vertically provided with a plurality of feeding cavities (11), and the two sides of the feeding plate (1) are vertically provided with a plurality of upper air channels (12) for air inlet.

3. The multirow orifice meltblown die of claim 2 wherein, The middle of the distribution plate (2) is provided with a distribution cavity (21) below the feeding cavity (11), and the two sides of the distribution plate (2) are vertically provided with a plurality of middle air channels (22) in communication with the upper air channels (12).

4. The multirow orifice meltblown die of claim 3 wherein, The middle of the spinneret upper plate (3) is provided with a melt cavity (31) in communication with the distribution cavity (21), the two sides of the spinneret upper plate (3) are provided with a plurality of lower air channels (32) in communication with the middle air channels (22), and the lower air channels (32) are adapted to communicate with the upper pressure stabilizing cavity (33).

5. The multirow orifice meltblown die of claim 1 wherein, The bottom of the melt cavity (31) is fixedly provided with a plurality of rows of spinneret columns (311) downward, the inside of the spinneret column (311) is provided with a spinneret cavity (313) in communication with the melt cavity (31), and each row of spinneret columns (311) is six.

6. The multirow orifice meltblown die of claim 1 wherein, The spinneret middle plate (4) and the spinneret lower plate (5) are respectively provided with a plurality of vertical through upper through holes (41) and lower through holes (51), and the spinneret columns (311) all pass through the upper through holes (41) and the lower through holes (51).

7. The multirow orifice meltblown die of claim 6 wherein, The conical nozzles (312) are all adapted to be inserted and installed in the lower through holes (51), the bottom of the spinneret lower plate (5) is provided with a spinneret groove (52) outside the lower through holes (51), and the conical nozzles (312) all extend out of the spinneret groove (52).

8. The multirow orifice meltblown die of claim 7 wherein, The upper through holes (41) are in sealing contact with the spinneret columns (311), the lower through holes (51) are conical and larger in size than the conical nozzles (312), when the conical nozzles (312) are inserted into the lower through holes (51), the lower through holes (51) and the conical nozzles (312) form the conical cavities (53).

9. The multirow orifice meltblown spinneret of claim 8 wherein, The lower through hole (51) is in fit communication with the lower pressure maintaining cavity (43), and when the conical cavity (53) is formed, the bottom of the conical cavity (53) is located outside the conical nozzle (312) to form a ring-shaped air outlet (531).

10. The multirow orifice meltblown die of claim 1 wherein, The feeding plate (1), the distribution plate (2), the upper spinning plate (3), the middle spinning plate (4) and the lower spinning plate (5) are sequentially connected and assembled through screw stacking.

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