Spinning assembly

Abstract

The utility model discloses a spinneret assembly which comprises a flow dividing piece and a flow guiding piece. After entering the inner cavity from the conveying channel, fibers are sprayed out to the flow guide face of the flow guide piece through the multiple spinneret orifices sequentially arranged along the straight line in the horizontal direction, and the uniform net laying effect is achieved. After being sprayed out from a group of spinneret orifices, fibers impact on the guide plate, change the flow direction and are vertically downward, and when reaching the lower end of the guide plate, the fibers are dragged by high-speed airflow sprayed out from the air outlet to fall down; the flow guide face plays a role in reversing the fibers, high-speed airflow sprayed out of the air outlet in the lower end of the flow guide face can also play a secondary traction and stretching role on the fibers, and the orientation and strength of the fibers are improved.

Description

Technical Field

[0001] This utility model relates to the field of nonwoven fabric technology, and more specifically, to a spinneret assembly. Background Technology

[0002] In the related technologies for the preparation of nonwoven fabric products, polymer resin is usually mixed with solvent and dissolved into a homogeneous solution in a high-temperature and high-pressure dissolving device. Then, it is sprayed out through a spinneret into a normal temperature and pressure environment. Due to the rapid drop in pressure, the solvent evaporates quickly, and the polymer is instantly stretched and solidified into extremely fine fibers. The fibers are collected through a mesh curtain, hot-pressed, and wound up to obtain the fiber nonwoven fabric product.

[0003] The existing spinning process involves conveying the dissolved spinning solution through a melt delivery pipe to a single spinneret, from which fiber bundles are extruded. The horizontally ejected fibers collide with a high-speed rotating splitter, changing direction and falling vertically downwards onto a collecting mesh belt, forming a fiber layer 150-400mm wide. This is then heat-pressed to obtain the final nonwoven fabric product. For wider products, a combination of multiple spinnerets and splitter discs is typically used, usually around 3-6 sets. This process uses the high-speed rotating splitter disc to cause the fiber bundles to change direction and oscillate laterally in a plane perpendicular to the collecting mesh belt, thus achieving a product of a certain width on the collecting mesh belt. To improve the uniformity of fiber spread on the mesh belt, static electricity is generated by a high-voltage electrostatic bar during the fiber bundle's descent, charging the fiber bundle to disperse each fiber as much as possible.

[0004] The existing spinning process has two main problems: (1) By rotating the filament splitter, the single bundle of filaments is made to swing left and right in the vertical plane to obtain a mesh of a certain width. Since the fiber bundle is relatively light, it is difficult to obtain a mesh with high uniformity due to the influence of airflow during the swing process; (2) The presence of static electricity poses a great safety hazard, especially in spinning systems where the solvent is flammable and explosive, the use of static electricity is greatly restricted. Utility Model Content

[0005] The purpose of this invention is to provide a spinneret assembly that can produce highly uniform mesh fabric without applying static electricity.

[0006] This utility model provides a spinneret assembly, including a flow divider, the flow divider including an inner cavity, a conveying channel communicating with the inner cavity and a plurality of spinnerets communicating with the inner cavity respectively, the plurality of spinnerets being arranged sequentially in a straight line in the horizontal direction;

[0007] The flow guide includes an air chamber and a flow guide surface. The flow guide surface is located at a predetermined distance in the spray direction of the spinneret orifice and is perpendicular to the straight line in the spray direction of the spinneret orifice. The air chamber is located on the side of the flow guide surface facing away from the flow divider. The air chamber includes an air inlet and an air outlet located at the bottom of the air chamber and extending downwards.

[0008] Optionally, the air outlet is a slit air outlet;

[0009] From a top-down perspective, the spray range of the spinneret falls within the air outlet range of the slit.

[0010] Optionally, the length of the spray range of the spinneret is 600mm-2500mm.

[0011] Optionally, the width of the slit outlet is 0.05mm-1mm;

[0012] And / or, the value of the height H of the lower end of the guide surface from the spinneret orifice is 100mm-300mm.

[0013] Optionally, the spinneret assembly also includes a collecting mesh belt located below the air outlet.

[0014] Optionally, an exhaust device is installed below the collection belt to provide a negative pressure environment for the collection belt.

[0015] Optionally, the spinneret assembly also includes a compressed air source connected to an air inlet.

[0016] Optionally, the compressed air source is a hot air source.

[0017] Optionally, the diameter of the spinneret orifice is 0.05mm-0.3mm, and the spacing between two adjacent spinneret orifices is 1 to 3 times the diameter of the spinneret orifice.

[0018] Optionally, the distance between the outlet of the spinneret and the guide surface is 50mm-150mm.

[0019] Based on the technical content disclosed in this utility model, the following beneficial effects are achieved:

[0020] The spinneret assembly provided by this utility model includes a flow divider and a flow guide. After the fiber enters the inner cavity from the conveying channel, it is ejected from the flow guide surface of the flow guide by multiple spinnerets arranged in a straight line in the horizontal direction, achieving a uniform web-laying effect. After the fiber is ejected from a set of spinnerets, it impacts the flow guide plate and changes its flow direction to vertically downward. When it reaches the lower end of the flow guide plate, it is pulled down by the high-speed airflow ejected from the air outlet. The flow guide surface not only plays a role in changing the direction of the fiber, but the high-speed airflow ejected from the air outlet at the lower end of the flow guide surface also has a secondary traction and stretching effect on the fiber, improving fiber orientation and strength.

[0021] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0023] Figure 1 This is a schematic diagram of the spinneret assembly structure of this utility model.

[0024] Figure 2 This is a front view of the spinneret assembly of this utility model.

[0025] Figure 3 for Figure 2 Sectional view along line AA.

[0026] Figure 4 This is a top view of the spinneret assembly of this utility model.

[0027] Figure 5 for Figure 4 Sectional view along the BB direction.

[0028] Explanation of reference numerals in the attached drawings: 101, spinning solution conveying pipe; 102, spinneret; 103, spinneret orifice; 201, compressed gas conveying pipe; 202, fiber guide plate; 203, air chamber; 204, air outlet; 301, collecting mesh belt; 401, fiber. Detailed Implementation

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] 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 discussed further in subsequent figures.

[0034] See Figure 1 This utility model discloses a spinneret assembly, including a flow divider and a flow guide.

[0035] The diverter includes a spinning solution conveying pipe 101 and a spinneret 102. The spinneret 102 is horizontally positioned and has a certain thickness. An inner cavity is formed inside the spinneret 102, one end of which is connected to the spinning solution conveying pipe 101. The spinning solution conveying pipe 101 includes a conveying channel for conveying fibers 401 into the inner cavity. A plurality of spinneret holes 103 are formed at the end of the inner cavity facing away from the spinning solution conveying pipe 101. The plurality of spinneret holes 103 are arranged sequentially in a straight line in the horizontal direction. The diameter D of the spinneret holes 103 is 0.05mm-0.3mm, preferably 0.05mm-0.2mm. The spacing between two adjacent spinneret holes 103 is 1 to 3 times the diameter of the spinneret hole 103.

[0036] Combination Figures 3 to 5 The flow guide includes a fiber guide plate 202 arranged vertically. A flat air chamber 203 is formed inside the fiber guide plate 202. The air chamber 203 includes an air inlet and an air outlet 204 located at the bottom of the air chamber 203 and extending downwards. The air outlet 204 is a slit air outlet 204 with a width W2 of 0.05mm-1mm. The airflow speed from the slit air outlet 204 can be adjusted according to process requirements. The air inlet of the air chamber 203 is located at the upper part of the air chamber 203 and is connected to a compressed gas delivery pipe 201. The compressed gas delivery pipe 201 is used to introduce compressed gas into the air chamber 203.

[0037] The height H of the lower end of the guide plate 202 (lower end of the guide surface) from the spinneret 103 is 100mm-300mm. The value of H affects the fiber stretching effect, and also affects the stability and uniformity of the fiber 401 on the collecting mesh belt 301. As the value of H increases, the stretching effect decreases, but the stability and uniformity of the web laying improve.

[0038] The fiber guide plate 202 is spaced apart from the flow divider in the spray direction of the spinneret 103. The fiber guide plate 202 includes a guide surface facing the side of the spinneret 103. The guide surface is located at a predetermined distance in the spray direction of the spinneret 103 and is perpendicular to the straight line of the spray direction of the spinneret 103. Preferably, the distance W1 between the outlet of the spinneret 103 and the guide surface is 50mm-150mm.

[0039] Specifically, in combination Figure 2 and Figure 3The air chamber 203 is located on the side of the guide surface facing away from the flow divider. The number of spinnerets 103 is determined by the width of the finished nonwoven fabric, ensuring that, from a top-view perspective, the spray range of the spinnerets 103 falls within the air outlet range of the slit outlet 204. In this embodiment, the length of the spray range L1 of the spinnerets is 600mm-2500mm. The length L2 of the slit outlet 204 is L1+200mm.

[0040] The spinneret also includes a compressed air source connected to the air inlet of the air chamber 203. After entering the air chamber 203, the compressed air is discharged from the slit outlet 204 at the bottom of the air chamber 203 to guide and stretch the fibers 401. Preferably, the compressed air source is a hot air source.

[0041] The spinneret assembly also includes a collecting mesh belt 301, which is located below the air outlet 204. An exhaust device is installed below the collecting mesh belt 301 to provide a negative pressure environment for the collecting mesh belt 301, which is used to adsorb the fibers 401 that fall on the mesh belt.

[0042] In summary, the spinneret assembly provided by this invention replaces the original single-hole spinneret process (the original process had a spinneret diameter of 0.6mm-2mm, while this invention has a spinneret diameter of 0.05mm-0.2mm) with a set of smaller spinneret holes 103. The fiber bundles emerging from each hole are finer, thus achieving a uniform web-forming effect without electrostatic splitting. Simultaneously, this invention replaces the original splitting disc with a guide plate. After the fibers 401 are ejected from the set of spinneret holes 103, they impact the guide plate, changing their flow direction to vertically downwards. Upon reaching the lower end of the guide plate, they are drawn down by the high-speed airflow ejected from the slit outlet 204 and fall onto the collection mesh belt 3. The guide plate not only changes the direction of the fibers 401, but the high-speed airflow ejected from the slit outlet 204 at the lower end of the guide plate also provides secondary traction and stretching to the fibers 401, improving their orientation and strength. This invention also heats the compressed gas. The hot air helps the residual solvent in fiber 401 that has not flashed to continue to evaporate, reducing solvent residue in the fiber and improving solvent recovery efficiency.

[0043] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A spinneret assembly, characterized in that, include: The diverter includes an inner cavity, a conveying channel communicating with the inner cavity, and a plurality of spinnerets communicating with the inner cavity, wherein the plurality of spinnerets are arranged sequentially in a straight line in the horizontal direction. A flow guide includes an air chamber and a flow guide surface. The flow guide surface is located at a predetermined distance in the spray direction of the spinneret orifice and is perpendicular to the straight line in the spray direction of the spinneret orifice. The air chamber is located on the side of the flow guide surface facing away from the flow divider. The air chamber includes an air inlet and an air outlet located at the bottom of the air chamber and extending downwards.

2. The spinneret assembly according to claim 1, characterized in that: The air outlet is a slit air outlet; From a top-down perspective, the spray range of the spinneret falls within the air outlet range of the slit.

3. The spinneret assembly according to claim 2, characterized in that: The length of the spray range of the spinneret is 600mm-2500mm.

4. The spinneret assembly according to claim 2, characterized in that: The width of the slit outlet is 0.05mm-1mm; And / or, the height H of the lower end of the guide surface from the spinneret orifice is 100mm-300mm.

5. The spinneret assembly according to any one of claims 1 to 4, characterized in that: The spinneret assembly also includes a collecting mesh belt located below the air outlet.

6. The spinneret assembly according to claim 5, characterized in that: A ventilation device is installed below the collection mesh belt, which provides a negative pressure environment for the collection mesh belt.

7. The spinneret assembly according to any one of claims 1 to 4, characterized in that: The spinneret assembly also includes a compressed air source, which is connected to the air inlet.

8. The spinneret assembly according to claim 7, characterized in that: The compressed air source is a hot air source.

9. The spinneret assembly according to any one of claims 1 to 4, characterized in that: The diameter of the spinneret is 0.05mm-0.3mm, and the distance between two adjacent spinnerets is 1 to 3 times the diameter of the spinneret.

10. The spinneret assembly according to any one of claims 1 to 4, characterized in that: The distance between the outlet of the spinneret and the guide surface is 50mm-150mm.

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