Anti-blocking structure of a spinning nozzle plate for spinning polyamide POY

Abstract

The utility model relates to the technical field of chemical fiber spinning equipment, concretely is a kind of nylon POY spinning spinneret anti-blocking structure, including spinneret body, multiple spinneret holes in array distribution are equipped on the spinneret body, common flow guide cavity covering all spinneret hole area is opened in the upper end surface of the spinneret body, one recessed entrance cavity is respectively communicated with one in the position corresponding to each spinneret hole of the bottom of common flow guide cavity, horn-shaped transition section and straight hole section are sequentially communicated below the recessed entrance cavity, the straight hole section is downwardly penetrated spinneret body and is opened in its lower end surface.This nylon POY spinning spinneret anti-blocking structure can effectively reduce melt retention and impurity accumulation, significantly reduce the risk of blockage, improve spinning stability and spinneret service life.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical fiber spinning equipment, specifically to an anti-clogging structure for a nylon POY spinning spinneret. Background Technology

[0002] Nylon POY is a widely used basic raw material in the chemical fiber industry, and its production process typically employs melt spinning. In this process, high-temperature melt is extruded through micropores in a spinneret and then cooled and solidified to form nascent fibers. As a key component in the spinning process, the structure of the spinneret directly affects the stability of spinning and the quality of the product.

[0003] Currently, most common nylon POY spinning spinnerets adopt a planar micro-orifice array design, with the melt flowing directly into the spinneret orifice from the feed chamber. However, during long-term continuous spinning, due to localized temperature drops in the melt or impurity deposition, gel-like blockages can easily form at the spinneret orifice inlet. Especially in the area where the orifice meets the feed chamber, the abrupt structural change creates a significant flow channel bend, making it easy for the melt to stagnate, thus exacerbating the risk of blockage. Once blockage occurs, it not only affects the uniformity of yarn output from a single orifice but may also lead to the scrapping of the entire spinneret, increasing production costs and downtime. Utility Model Content

[0004] The purpose of this invention is to provide an anti-clogging structure for nylon POY spinning spinnerets, in order to solve the problem mentioned in the background art where the current spinnerets cause melt retention, easy formation of gel or impurity accumulation and clogging during the spinning process due to abrupt changes in the flow channel structure at the spinneret inlet.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a nylon POY spinning spinneret anti-clogging structure, comprising a spinneret body, wherein the spinneret body is provided with a plurality of spinneret holes arranged in an array, and a common flow guiding cavity covering the entire area of ​​the spinneret holes is opened on the upper end face of the spinneret body, wherein a concave inlet cavity is connected to the bottom of the common flow guiding cavity corresponding to the position of each spinneret hole, and a trumpet-shaped transition section and a straight hole section are connected in sequence below the concave inlet cavity, wherein the straight hole section penetrates downward through the spinneret body and opens at its lower end face.

[0006] Preferably, the common flow guiding cavity is a shallow cavity with a depth of 0.2 to 0.5 mm, whose planar contour matches the outer edge of the spinneret array, and the bottom of the common flow guiding cavity is slightly arc-shaped.

[0007] Preferably, the concave inlet cavity is a spherical or parabolic concave cavity with a maximum opening diameter greater than the diameter of the corresponding spinneret orifice, and the difference between the two is 0.02 to 0.08 mm, and the depth is 0.1 to 0.3 mm.

[0008] Preferably, the angle between the sidewall of the trumpet-shaped transition section and the axial centerline of the spinneret body is 15° to 30°, and the inner wall of the trumpet-shaped transition section smoothly transitions tangentially to the bottom of the concave inlet cavity.

[0009] Preferably, a micro-step flow divider is provided between the shared flow guide cavity and the concave inlet cavity. The micro-step flow divider is formed by two annular steps distributed sequentially along the axial direction, with a height difference of 0.01 to 0.03 mm between adjacent steps, forming a continuous descending channel.

[0010] Preferably, the concave inlet cavity has six radially extending guide microribs on its sidewall. The guide microribs are 5 to 15 μm high and 0.05 to 0.1 mm wide, with their ends pointing towards the central axis of the trumpet-shaped transition section.

[0011] Compared with existing technologies, the beneficial effects of this invention are: the anti-clogging structure of the nylon POY spinning spinneret can effectively reduce melt retention and impurity accumulation, significantly reduce the risk of clogging, and improve spinning stability and spinneret service life. This structure, by setting a common guiding cavity covering the entire spinneret orifice area on the spinneret body, and combining a concave inlet cavity, a trumpet-shaped transition section, and a straight orifice section to form a continuous and smooth flow channel, eliminates the abrupt angle between the feed chamber and the spinneret orifice in traditional structures, making the melt flow more uniform and smooth, and fundamentally inhibiting the deposition of gel and impurities in the orifice area. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the anti-clogging structure of the spinneret for nylon POY spinning according to this utility model; Figure 2 This is a top view of the internal structure of the common flow guiding cavity of the anti-clogging structure of the spinneret in nylon POY spinning according to this utility model; Figure 3 This is a schematic diagram of the connection structure between the guide microribs and the concave inlet cavity of the anti-clogging structure of the nylon POY spinning spinneret according to this utility model.

[0013] In the figure: 1. Spinneret body; 2. Spinneret orifice; 3. Common guide cavity; 4. Concave inlet cavity; 5. Trumpet-shaped transition section; 6. Straight hole section; 7. Micro-step flow divider; 8. Guide micro-ribs. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-3This utility model provides a technical solution: a nylon POY spinning spinneret anti-clogging structure, including a spinneret body 1, a plurality of spinneret holes 2 arranged in an array on the spinneret body 1, a common flow guiding cavity 3 covering the area of ​​all spinneret holes 2 on the upper end face of the spinneret body 1, the common flow guiding cavity 3 and the spinneret body 1 are integrally formed, and a concave inlet cavity 4 is connected to the bottom of the common flow guiding cavity 3 corresponding to the position of each spinneret hole 2, the concave inlet cavity 4 is directly formed by milling or etching the bottom face of the common flow guiding cavity 3 downwards, and a horn is connected to the bottom of the concave inlet cavity 4 in sequence. The flared transition section 5 and the straight hole section 6 are integrally machined using a curved tangential method. The conical sidewall of the flared transition section 5 extends continuously along the axial direction to the starting end of the straight hole section 6, which is a cylindrical hole of equal diameter. It penetrates vertically downward from the end of the flared transition section 5 through the spinneret body 1 and opens at its lower end face. The three of them form a complete single-hole flow channel from the inlet to the outlet. The straight hole section 6 penetrates downward through the spinneret body 1 and opens at its lower end face. In this structure, the high-temperature melt first enters the common guide cavity 3 covering the entire area of ​​the spinneret holes 2, and achieves initial flow through its uniformly distributed cavity structure. After pressure stabilization and flow diversion, the melt flows from the bottom of the common guide cavity 3 into the concave inlet cavity 4, corresponding to the positions of each spinneret orifice 2. The concave inlet cavity 4 effectively eliminates traditional right-angle inflection points through a curved transition, allowing the melt flow direction to change smoothly. It then smoothly enters the lower trumpet-shaped transition section 5. The trumpet-shaped transition section 5, with its gradually narrowing conical channel, further guides the melt to accelerate and concentrate its flow towards the central axis, finally smoothly transitioning to the straight orifice section 6 for spinning. Throughout the entire process, the spinneret body 1 acts as the overall support carrier, ensuring the smooth operation of the common guide cavity 3, the concave inlet cavity 4, and the trumpet-shaped transition section 5. A continuous, seamless, and dead-angle-free flow channel system is formed between the spinneret section 6 and the straight-hole section 2. This significantly reduces the stagnation of melt in the inlet area of ​​the spinneret orifice 2 caused by abrupt changes in the flow channel structure, and avoids the formation of gel-like blockages caused by local temperature drops or impurity deposition. This effectively solves the frequent clogging problem caused by obvious bends and numerous flow dead zones at the spinneret orifice inlet in existing technologies, ensuring the uniformity and continuity of wire output from a single orifice, extending the service life of the spinneret body 1, and reducing downtime for replacement and increased production costs due to clogging. The shared guide cavity 3 has a depth of 0.2–0.5 mm. The shallow cavity of mm has a planar profile that matches the outer edge of the spinneret array 2, and the bottom of the common flow guide cavity 3 is slightly arc-shaped. This structure enables the melt to achieve uniform distribution and pressure balance before entering each spinneret 2. The slightly arc-shaped cavity bottom further promotes smooth melt flow and avoids the formation of stagnation areas at the edges or corners of the common flow guide cavity 3, thereby reducing the accumulation of impurities and gel formation caused by local temperature drop or flow dead zones. The concave inlet cavity 4 is a spherical or parabolic concave cavity with a maximum opening diameter larger than the diameter of the corresponding spinneret 2, and the difference between the two is 0.02 to 0.08 mm, and the depth is 0.1 to 0.The 3 mm diameter structure, through curved transition and moderate flaring design, effectively mitigates the abrupt change in flow direction of the melt as it enters the spinneret orifice 2 from the common guide cavity 3, reducing shear stress concentration and eddy formation at the inlet. This reduces melt retention and impurity adhesion, preventing gel blockage. The sidewall of the trumpet-shaped transition section 5 forms an angle of 15° to 30° with the axial centerline of the spinneret body 1, and the inner wall of the trumpet-shaped transition section 5 smoothly transitions tangentially to the bottom of the concave inlet cavity 4. This structure allows the melt to achieve smooth acceleration and flow convergence before entering the straight orifice section 6 from the concave inlet cavity 4, avoiding backflow or dead zones caused by abrupt changes in cross-section, effectively suppressing local retention and impurity deposition, and improving the uniformity and stability of the filament output. A micro-step flow divider 7 is provided between the common guide cavity 3 and the concave inlet cavity 4. The micro-step flow divider 7 consists of two annular steps distributed sequentially along the axial direction, with a height difference of 0.01 to 0.03 mm between adjacent steps. The micro-step flow channel 7, with its multi-stage micro-steps, gradually releases melt pressure and buffers flow velocity, preventing turbulence or localized accumulation caused by sudden pressure changes when the melt enters the concave inlet 4. This further eliminates dead zones and enhances the anti-clogging effect. Six radially extending guide microribs 8, 5–15 μm high and 0.05–0.1 mm wide, are located on the sidewall of the concave inlet 4, with their ends pointing towards the central axis of the trumpet-shaped transition section 5. This structure uses the guide microribs 8 to directionally manage the melt flow boundary layer, causing the melt to converge radially towards the central axis, reducing the stagnation area near the sidewall of the concave inlet 4, effectively inhibiting impurity adhesion and gel formation, and improving the self-cleaning ability of the flow channel.

[0016] Working principle: When using the anti-clogging structure of the nylon POY spinning spinneret, the high-temperature melt first enters the common guide cavity 3 on the upper end face of the spinneret body 1 from the external feeding system. Under the action of the micro-arc bottom of the cavity and the matching array contour, it achieves initial uniform distribution. Then, the melt flows into each concave inlet cavity 4 through the micro-step flow channel 7 between the common guide cavity 3 and the concave inlet cavity 4. During the flow, it is radially constrained by the 6 guiding micro-ribs 8 on the side wall and converges towards the central axis. Then, the melt smoothly transitions from the concave inlet cavity 4 to the trumpet-shaped transition section 5 and accelerates downward along its inclined conical channel. Finally, the melt is stably extruded from the spinneret hole 2 on the lower end face of the spinneret body 1 through the straight hole section 6, forming continuous and uniform nascent fibers, thus completing the spinning process.

[0017] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nylon POY spinning spinneret anti-clogging structure, comprising a spinneret body (1), wherein the spinneret body (1) is provided with a plurality of spinneret holes (2) arranged in an array, characterized in that: The upper end face of the spinneret body (1) is provided with a common flow guide cavity (3) covering the area of ​​all spinneret holes (2). The bottom of the common flow guide cavity (3) is connected to a concave inlet cavity (4) corresponding to the position of each spinneret hole (2). The concave inlet cavity (4) is connected to a trumpet-shaped transition section (5) and a straight hole section (6) in sequence below it. The straight hole section (6) penetrates the spinneret body (1) downward and opens at its lower end face.

2. The anti-clogging structure for a nylon POY spinning spinneret according to claim 1, characterized in that: The common flow guide cavity (3) is a shallow cavity with a depth of 0.2 to 0.5 mm. Its planar profile matches the outer edge of the spinneret array (2), and the bottom of the common flow guide cavity (3) is slightly arc-shaped.

3. The anti-clogging structure for a nylon POY spinning spinneret according to claim 1, characterized in that: The concave inlet cavity (4) is a spherical or parabolic concave cavity with a maximum opening diameter greater than the diameter of the corresponding spinneret (2) and a difference of 0.02 to 0.08 mm, and a depth of 0.1 to 0.3 mm.

4. The anti-clogging structure for a nylon POY spinning spinneret according to claim 1, characterized in that: The sidewall of the trumpet-shaped transition section (5) has an angle of 15° to 30° with the axial center line of the spinneret body (1), and the inner wall of the trumpet-shaped transition section (5) smoothly transitions tangentially with the bottom of the concave inlet cavity (4).

5. The anti-clogging structure for a nylon POY spinning spinneret according to claim 1, characterized in that: A micro-step flow divider (7) is provided between the shared flow guide cavity (3) and the concave inlet cavity (4). The micro-step flow divider (7) is composed of two annular steps distributed sequentially along the axial direction. The height difference between adjacent steps is 0.01 to 0.03 mm, forming a continuous descending channel.

6. The anti-clogging structure for a nylon POY spinning spinneret according to claim 1, characterized in that: The concave inlet cavity (4) has 6 radially extending guide microribs (8) on its sidewall. The guide microribs (8) are 5 to 15 μm high and 0.05 to 0.1 mm wide, and their ends point to the central axis of the trumpet-shaped transition section (5).

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