Melt-blowing mold

Abstract

The melt-blowing mold comprises a feeding part, at least two discharging parts and at least two air blowing parts, the two discharging parts are both connected with the feeding part, the two discharging parts are connected to form a containing cavity communicating with the feeding part, and a material distributing plate is arranged in the containing cavity; a plurality of via holes facing the side far away from the feeding part are formed in the material distributing plate in the length direction of the material distributing plate, and the side, far away from the feeding part, of the material distributing plate abuts against the two discharging parts at the same time to form spinneret orifices; the at least two air blowing parts are arranged on the side, away from the feeding part, of each discharging part, a gap air cavity is formed between each air blowing part and the corresponding discharging part, and the spinneret orifices are located between the two gap air cavities. The spinneret orifice in the melt-blowing mold is of the sandwich structure formed by splicing the two discharging parts and the material distribution plate with the via holes, the spinneret orifice can be cleaned conveniently, and the cleaning efficiency of the spinneret orifice is improved.

Description

Technical Field

[0001] The present application relates to the technical field of meltblowing dies, and in particular to a meltblowing die. Background Art

[0002] The meltblown die uses the meltblown nonwoven process to produce meltblown cloth. The meltblown nonwoven process uses high-speed hot air to pull the polymer melt stream extruded from the die spinneret hole, thereby forming ultra-fine fibers and condensing them on the mesh curtain or roller, and relying on self-bonding to become nonwoven fabrics.

[0003] A traditional meltblown mold generally includes a V-shaped mold body and a pair of air plates assembled on both sides of the mold body. A melt storage cavity is formed in the mold body, and several injection holes with a diameter of 0.3 mm connected to the melt storage cavity are formed at the top of the melt storage cavity. The meltblown raw materials are ejected from the injection holes to form a non-woven fabric. However, the meltblown raw materials used in the meltblown mold have a low melting point (within 200°C), so the requirements for the injection holes in the mold are not high. However, for engineering plastics (such as PPS / PC / PP / PEEK / PEKK) with high melting point and viscosity, conventional meltblown molds are prone to carbonization and hole blocking, and post-blocking treatment is extremely difficult. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings, the purpose of the present application is to provide a meltblown die, in which the spinneret hole is a sandwich structure formed by splicing two discharge parts and a dividing plate with through holes. This design facilitates the cleaning of the spinneret hole and improves the cleaning efficiency of the spinneret hole.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] A melt-blowing die, comprising:

[0007] Feeding section;

[0008] At least two discharge parts are connected to the feed part, the two discharge parts are connected to form a cavity connected to the feed part, a dividing plate is arranged in the cavity, and the dividing plate is provided with a plurality of through holes along its length direction facing the side away from the feed part, and the side of the dividing plate away from the feed part abuts against the two discharge parts at the same time to form a spinneret hole;

[0009] At least two blowing parts are respectively arranged on a side of each discharge part away from the feed part, a gap air cavity is formed between each blowing part and the discharge part, and the spinneret hole is located between the two gap air cavities.

[0010] In one embodiment, the cavity has a first equal-width section, a gradual section, and a second equal-width section, the gradual section is connected to the first equal-width section and the second equal-width section, the first equal-width section is connected to the feeding portion,

[0011] The width of the first equal-width section is greater than that of the second equal-width section, and the width of the gradual section gradually decreases from the first equal-width section to the second equal-width section.

[0012] In one embodiment, the dividing plate has a fixed section, an extension section, and a bending section connecting the fixed section and the extension section;

[0013] The fixed section is located in the first equal-width section of the cavity, and the fixed section is connected to one of the discharge portions;

[0014] The bending section is located in the gradient section of the cavity, and the bending section and the fixed section are both in contact with the same discharge portion;

[0015] The extension section is located in the second equal-width section of the cavity, and the extension section abuts against the two discharge portions simultaneously.

[0016] In one embodiment, the via hole extends from the fixed section toward the extending section, wherein a plurality of the via holes on the extending section are spliced ​​with the two discharge portions to form a spinneret hole, and the diameter of the spinneret hole is 0.3 mm.

[0017] In one embodiment, a groove is formed on the connection surface between each of the discharge portions and the corresponding blowing portion, and the groove is communicated with the gap air cavity;

[0018] Each of the blowing parts is provided with a plurality of air outlet holes at a position corresponding to the groove, and the plurality of air outlet holes are evenly distributed along the length direction of the blowing part;

[0019] An air inlet chamber is provided in each of the discharge parts, and at least one air inlet hole is arranged on a side of each of the discharge parts away from the gap air cavity, and the air inlet chamber is communicated with the air outlet hole and the air inlet hole respectively.

[0020] In one embodiment, each of the blowing parts has a first guiding slope, each of the blowing parts has a second guiding slope, and a running clearance air cavity is formed between each of the first guiding slope and the second guiding slope.

[0021] In one embodiment, each of the discharge portions has a through hole extending therethrough along its length direction, and a heating element is disposed in each of the through holes.

[0022] In one embodiment, the two discharge parts are connected by a first fastening screw;

[0023] The feeding part and the two discharging parts are connected by a plurality of second fastening screws;

[0024] Each of the blowing parts is connected to the discharging part via a plurality of third fastening screws.

[0025] In one embodiment, a feed port is disposed on a side of the feed portion away from the discharge portion, a channel structure connected to the feed port is disposed in the feed portion, and an end of the channel structure away from the feed port is connected to the cavity.

[0026] In one embodiment, the channel structure includes a first feed channel and a second feed channel, the first feed channel is connected to the feed port, and the first feed channel is not connected to the cavity, the first feed channel is connected to the second feed channel at both ends along its length direction, and the second feed channel is connected to the cavity.

[0027] Beneficial Effects

[0028] The spinneret in the present application is a sandwich structure formed by splicing two discharge parts and a dividing plate with through holes. After the spinneret is blocked, the dividing plate can be immediately removed from the discharge part to achieve rapid cleaning and unblocking of the dividing plate, thereby improving the maintenance efficiency of the meltblown mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure. The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions and are only intended to illustrate the content of the present application.

[0030] Figure 1 A schematic diagram of the meltblowing die structure provided in an embodiment of the present application;

[0031] Figure 2 A schematic cross-sectional view of a meltblowing die provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the structure of the material dividing plate provided in the embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of the discharging part provided in the embodiment of the present application;

[0034] Figure 5 A schematic cross-sectional view of a discharge portion provided in an embodiment of the present application;

[0035] Figure 6 A cross-sectional schematic diagram of a blowing portion provided in an embodiment of the present application;

[0036] Figure 7This is a schematic diagram of the structure of the feeding part provided in the embodiment of the present application. DETAILED DESCRIPTION

[0037] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted as the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in conventional experiments.

[0038] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connecting" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. In this article, "electrical connection" includes the situation where the constituent elements are connected together through an element with some electrical function. "Elements with some electrical function" are not particularly limited as long as they can transfer electrical signals between the connected constituent elements. "Elements with some electrical function" can be, for example, electrodes or wiring, or switching elements such as transistors, or other functional elements such as resistors, inductors or capacitors. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0039] In this application, the directions or positional relationships indicated by the terms "upper", "lower", "inner", "middle", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0040] The present application discloses a meltblowing die, which is suitable for spraying engineering plastics with high melting point and high viscosity to form nonwoven fabrics. The meltblowing die includes a feed part, at least two discharge parts, and at least two blowing parts. The two discharge parts are connected to the feed part, and the two discharge parts are connected to form a cavity connected to the feed part. A dividing plate is arranged in the cavity. The dividing plate is provided with a plurality of through holes facing the side away from the feed part along its length direction. The side of the dividing plate away from the feed part abuts against the two discharge parts at the same time to form a spinneret hole; at least two blowing parts are respectively arranged on the side of each discharge part away from the feed part, and a gap air cavity is formed between each blowing part and the discharge part, and the spinneret hole is located between the two gap air cavities. The spinneret hole in the present application is a sandwich structure formed by splicing two discharge parts and a dividing plate with through holes. After the spinneret hole is blocked, the dividing plate can be immediately removed from the discharge part to achieve rapid cleaning and dredging of the dividing plate, thereby improving the maintenance efficiency of the meltblowing die.

[0041] Next join Figure 1-Figure 7 , to describe the embodiment of the present application provides a melt-blowing mold, the melt-blowing raw material in the melt-blowing mold can be suitable for engineering plastics with high melting point and high viscosity, such as PPS, PC, PP, PEEK or PEKK, the melt-blowing mold includes a feed part 10, at least two discharge parts 20 and at least two air outlet parts 30,

[0042] At least two discharge parts 20 are connected to the feed part 10, and the two discharge parts 20 are connected to form a cavity 21 connected to the feed part, and a dividing plate 40 is arranged in the cavity. The dividing plate 40 is provided with a plurality of through holes 44 along its length direction facing the side away from the feed part, wherein the side of the dividing plate 40 away from the feed part abuts against the two discharge parts 20 at the same time to form a spinneret hole;

[0043] At least two blowing parts 30 are respectively arranged on one side of each discharge part 20 away from the feed part 10 . A gap air cavity 50 is formed between each blowing part 30 and the discharge part, and the spinneret hole is located between the two gap air cavities 50 .

[0044] It should be noted that the deeper the axial depth of the spinneret hole, the faster the ejection speed of the material ejected from the spinneret hole, and the better the quality of the nonwoven fabric formed. The spinneret hole in this embodiment is formed by splicing a split plate with a through hole and two discharge parts. Compared with the traditional process of forming the spinneret hole by drilling process, the difficulty of forming the spinneret hole is further reduced, and the axial depth of the spinneret hole can also be better controlled. At the same time, after the spinneret hole is blocked, the split plate can be immediately removed from the discharge part to achieve rapid cleaning and dredging of the split plate, thereby improving the maintenance efficiency of the meltblown mold.

[0045] refer to Figure 1 and Figure 7In this embodiment, a feed port 11 is arranged on the side of the feed part 10 away from the discharge part, and a channel structure connected to the feed port 11 is arranged in the feed part 10, and one end of the channel structure away from the feed port 11 is connected to the cavity 21, preferably, the feed port 11 is located in the middle of the surface of the side of the feed part 10 away from the discharge part, wherein the feed port 11 is connected to the output port of the melt-blown raw material, and the melt-blown raw material can enter the cavity through the feed port and the channel structure, and further, the channel structure includes a first feed channel 12 and a second feed channel 13, wherein the first The feed channel 12 is connected with the feed port 11, and the first feed channel is not connected with the cavity. The first feed channel 12 is connected with the second feed channels 13 at both ends along its length direction, and the second feed channel 13 is connected with the cavity 21. Preferably, the length of the first feed channel is smaller than the length of the second feed channel. This design allows the meltblown raw material to pass through the feed port 11, first flow into the first feed channel 12, and then flow into the cavity 21 through the second channel 13, and then after being divided through the through hole 44 on the dividing plate 40, it is finally ejected through the spinneret hole.

[0046] In a specific embodiment, the two discharge parts 20 are connected by a first fastening screw (not shown in the drawings); the feed part 10 and the two discharge parts 20 are connected by a plurality of second fastening screws (not shown in the drawings); each blowing part 30 is connected to the discharge part 20 by a plurality of third fastening screws (not shown in the drawings). Specifically, the feed part, the discharge part and the blowing part are all detachably connected by fastening screws, and when the spinneret hole is blocked, the melt-blown mold can be disassembled immediately, saving time and cost.

[0047] refer to Figure 2 , Figure 5 and Figure 6 In a specific embodiment, each discharge portion 20 has a first guide slope 24 , each blowing portion 30 has a second guide slope 34 , and a gap air cavity 50 is formed between each first guide slope 24 and the second guide slope 34 .

[0048] refer to Figure 6 In this embodiment, the cavity 21 has a first equal-width section 211, a gradient section 212 and a second equal-width section 213. The gradient section 212 connects the first equal-width section 211 and the second equal-width section 213. The first equal-width section 211 is connected to the feed portion 10, specifically, connected to the feed channel 12 in the feed portion 10. The width of the first equal-width section 211 is greater than that of the second equal-width section 213. The width of the gradient section 212 gradually decreases from the first equal-width section 211 to the second equal-width section 213.

[0049] refer to Figure 3 and Figure 5In this embodiment, the dividing plate 40 has a fixed section 41, an extension section 43, and a bending section 42 connecting the fixed section 41 and the extension section 43; the fixed section 41 is located in the first equal-width section 211 of the cavity 21, and the fixed section 41 is connected to one of the discharge parts 20. Specifically, the fixed section 41 and the discharge part 20 are connected by a fourth fastening screw (not shown in the drawings); the bending section 41 is located in the gradient section 212 of the cavity 21, and the bending section and the fixed section are both in contact with the same discharge part; the extension section 43 is located in the second equal-width section 211 of the cavity 21. In section 213, the extension section 43 is respectively in contact with the two discharge parts 20 at the same time. Furthermore, the through hole extends from the fixed section 41 to the extension section 43, wherein a plurality of through holes 44 located on the extension section 43 are spliced ​​with the two discharge parts 20 to form a spinneret hole with a diameter of 0.3 mm. The fixed section 41, the extension section 43 and the bending section 42 of the dividing plate 40 all have through holes. This design allows the meltblown raw material in the cavity 21 to be pre-diverted in the first equal-width section 211 and the gradient section 212, so that the meltblown raw material can flow into the spinneret hole better.

[0050] refer to Figure 6 In the present embodiment, each discharge portion 20 has a through hole 23 extending along its length direction, and each through hole is provided with a heating element. The heating element in the present embodiment is specifically a heating rod. By arranging the heating rod in the through hole, the meltblown raw material flowing through is heated to prevent the meltblown raw material from solidifying at the spinneret hole position, causing the spinneret perforation to be blocked, thereby affecting the use of the entire meltblown mold.

[0051] refer to Figure 6 In this embodiment, a groove 23 is formed on the connection surface between each discharge portion 20 and the corresponding blowing portion, and the groove 23 is communicated with the gap air cavity 50. A plurality of air outlet holes 33 are arranged at the corresponding groove 23 of each blowing portion 30, and the plurality of air outlet holes 33 are evenly distributed along the length direction of the blowing portion; an air inlet chamber 32 is arranged in each blowing portion, and at least one air inlet hole 31 is arranged on the side of each blowing portion 30 away from the gap air cavity, and the air inlet chamber 32 is respectively communicated with the air outlet hole 33 and the air inlet hole 31. Preferably, two air inlets 31 are arranged on the side of each blowing portion 30, and the two air inlets are respectively distributed at both ends of the length direction of the blowing portion 30 (such as Figure 1 Specifically, the air inlet chamber 32 is connected to an external air supply source through the air inlet hole 31. After the external high-pressure gas reaches the groove through the air outlet hole, it forms a high-pressure airflow from the groove to the spinneret hole through the gap air cavity.

[0052] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with the technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit of the present application shall be included in the protection scope of the present application.

Claims

1. A meltblown die, characterized in that: include: Feeding section; At least two discharge parts are connected to the feed part, the two discharge parts are connected to form a cavity connected to the feed part, a dividing plate is arranged in the cavity, and the dividing plate is provided with a plurality of through holes along its length direction facing the side away from the feed part, and the side of the dividing plate away from the feed part abuts against the two discharge parts at the same time to form a spinneret hole; At least two blowing parts are respectively arranged on a side of each discharge part away from the feed part, a gap air cavity is formed between each blowing part and the discharge part, and the spinneret hole is located between the two gap air cavities.

2. The meltblowing die according to claim 1, characterized in that: The cavity has a first equal width section, a gradual section, and a second equal width section, the gradual section is connected to the first equal width section and the second equal width section, the first equal width section is connected to the feeding portion, The width of the first equal-width section is greater than that of the second equal-width section, and the width of the gradual section gradually decreases from the first equal-width section to the second equal-width section.

3. The meltblowing die according to claim 2, characterized in that: The dividing plate comprises a fixed section, an extending section, and a bending section connecting the fixed section and the extending section; The fixed section is located in the first equal-width section of the cavity, and the fixed section is connected to one of the discharge portions; The bending section is located in the gradient section of the cavity, and the bending section and the fixed section are both in contact with the same discharge portion; The extension section is located in the second equal-width section of the cavity, and the extension section abuts against the two discharge portions simultaneously.

4. The meltblowing die according to claim 3, characterized in that: The through holes extend from the fixed section toward the extending section, wherein a plurality of the through holes on the extending section are spliced ​​with the two discharge portions to form a spinneret hole, and the diameter of the spinneret hole is 0.3 mm.

5. The meltblowing die according to claim 1, characterized in that: A groove is formed on the connection surface between each of the discharge parts and the corresponding blowing part, and the groove is communicated with the gap air cavity; Each of the blowing parts is provided with a plurality of air outlet holes at a position corresponding to the groove, and the plurality of air outlet holes are evenly distributed along the length direction of the blowing part; An air inlet chamber is provided in each of the discharge parts, and at least one air inlet hole is arranged on a side of each of the discharge parts away from the gap air cavity, and the air inlet chamber is communicated with the air outlet hole and the air inlet hole respectively.

6. The meltblowing die according to claim 1, characterized in that: Each of the blowing parts has a first guiding slope, each of the blowing parts has a second guiding slope, and a running clearance air cavity is formed between each of the first guiding slope and the second guiding slope.

7. The meltblowing die according to claim 1, characterized in that: Each of the discharge portions has a through hole extending therethrough along its length direction, and a heating element is disposed in each of the through holes.

8. The meltblowing die according to claim 1, characterized in that: The two discharging parts are connected by a first fastening screw; The feeding part and the two discharging parts are connected by a plurality of second fastening screws; Each of the blowing parts is connected to the discharging part via a plurality of third fastening screws.

9. The meltblowing die according to claim 1, characterized in that: The feeding part is provided with a feeding port on one side away from the discharging part, the feeding part is provided with a channel structure connected with the feeding port, and one end of the channel structure away from the feeding port is connected with the containing cavity.

10. The meltblowing die according to claim 9, characterized in that: The channel structure includes a first feed channel and a second feed channel, the first feed channel is connected to the feed port, and the first feed channel is not connected to the cavity, the first feed channel is connected to the second feed channel at both ends along its length direction, and the second feed channel is connected to the cavity.

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