A reverse c combination type spinneret

Abstract

The utility model relates to a spinning plate technical field discloses a reverse C combination type spinning plate, including spinning plate main part, a plurality of rectangular array's spinning hole is formed on spinning plate main part, the spinning hole includes two or more than C type department back leaning set combination constitutes. Through with the structure that the spinning hole is set to two or more than C type department back leaning set combination constitutes, utilize the feature that melt passes through the spinning hole and expands larger to C type opening direction, through the design of pre -concave of spinning hole to offset the uneven expansion of melt. For two back leaning set C type department, can make the even outward expansion of all -round of chemical fiber and form circular section, for more than three back leaning set C type department and the concave polygon that enclose, can make the chemical fiber section and form the regular polygon shape, thereby realized the accurate control to chemical fiber cross section shape, satisfied the diversified production demand.

Description

Technical Field

[0001] This utility model relates to the field of spinneret technology, and in particular to a reverse C-combination spinneret. Background Technology

[0002] In the field of chemical fiber production, profiled fibers have attracted much attention due to their unique properties. Profiled fibers are typically spun using spinnerets with non-circular orifices, which come in various shapes, such as triangles, squares, pentagons, and other polygons. However, in actual production, there are currently many problems with using these polygonal spinnerets. Chemical fibers extruded from triangular spinnerets do not have an ideal triangular cross-section; instead, they exhibit a Reuleaux triangle shape. This is because during extrusion, the melt is unevenly constrained by the orifice walls. In the straight-edge region, the melt shear stress is perpendicular to the straight edge, the molecular chains are oriented axially, and elastic potential energy is stored outside the straight edge. After extrusion, the straight edge expands outward into an arc. In the sharp-corner region, the melt is compressed by the corner, stress is concentrated, and the molecular chain orientation is disordered. After extrusion, the expansion rounds off the sharp corner, ultimately forming a Reuleaux triangle-like cross-section. Similarly, the cross-section of the chemical fiber extruded from the square spinneret is a convex quadrilateral shape. This is because when the melt flows in the square hole, the constraints on each side and corner are different. After demolding, the elastic recovery causes the original straight edges to convex outward, and the corners to be rounded, making it impossible to obtain a regular square cross-section.

[0003] For synthetic fibers composed of two materials, existing spinnerets often employ irregularly shaped spinnerets consisting of two C-shaped orifices with their openings facing each other. However, the cross-section of the synthetic fiber extruded from this irregularly shaped spinneret is figure-eight shaped, not circular. This is because in this orifice shape, the melt is strongly constrained circumferentially in the closed arc segment of each C-shape, resulting in uniform shear stress, axial orientation of the molecular chains, and storage of elastic potential energy on the outer side of the arc, leading to outward expansion after demolding. At the open end, the melt is less constrained, and in addition to radial expansion after demolding, it also exhibits an opening tendency along the opening direction due to stress release. When the two C-shaped orifices are arranged facing each other, their respective expansion effects are superimposed, forming a figure-eight cross-section, which is difficult to meet the requirement for a circular cross-section.

[0004] Current technologies, when using polygonal spinnerets and irregularly shaped spinnerets with specific C-shaped combinations, cannot accurately obtain the target cross-sectional shape of synthetic fibers. This severely limits the performance and application range of synthetic fiber products. There is an urgent need to develop new spinneret structures or technologies to solve these problems, achieve precise control of the cross-sectional shape of synthetic fibers, and meet diverse production needs. Utility Model Content

[0005] The purpose of this invention is to provide a reverse C-shaped spinneret to solve the problem that in the production of chemical fibers using polygonal spinnerets and specific C-shaped spinnerets, it is impossible to accurately obtain the target cross-sectional shape.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0007] A reverse C-shaped spinneret includes a spinneret body with a plurality of rectangular arrayed spinneret holes formed on the body. Each spinneret hole comprises two or more C-shaped sections arranged back-to-back. The melt is compressed within the spinneret. As the melt passes through the spinneret holes, it expands outward due to reduced pressure, with the expansion often greater towards the C-shaped openings than in other directions. The synthetic fiber extruded from two back-to-back C-shaped sections expands uniformly outward circumferentially, forming a complete circle in cross-section. The synthetic fiber extruded from a concave polygon formed by three back-to-back C-shaped sections forms a regular polygon in cross-section. This pre-concave design of the spinneret holes counteracts the uneven expansion of the melt after passing through them, resulting in a more uniform final synthetic fiber cross-section.

[0008] This utility model is further configured such that the C-shaped portion has two parts;

[0009] The C-shaped section is a C-shaped seam, and the C-shaped seams of the two C-shaped sections are connected.

[0010] The C-shaped seam has a vertical seam on the side furthest from the opening, and the two C-shaped seams share a single vertical seam. The back-to-back C-shaped seams can be considered as a "closed area in the middle + open areas on both sides." In the closed arc section in the middle (the inner side of the two Cs): the melt is most constrained by the side walls, shear stress is concentrated and symmetrically distributed, molecular chains are uniformly oriented along the axial direction, and elastic potential energy is mainly stored radially outward (away from the bonding surface). In the open areas on both sides (the gaps between the two Cs): the melt is less constrained, shear stress is low, molecular chain orientation is disordered, and elastic potential energy is mainly stored radially outward (towards both sides). After the melt exits the mold, the elastic recovery exhibits a superimposed effect of "omnidirectional uniform expansion." In the melt in the middle bonding area: the elastic recovery direction expands outward to both sides (perpendicular to the bonding surface), and due to the symmetry of both sides, the expansion force is balanced; in the melt in the open areas on both sides: the elastic recovery direction expands outward (away from the center), but due to the symmetrical distribution of the two Cs, the expansion forces on both sides complement each other radially (in the 360° direction).

[0011] The present invention is further configured such that: the spinneret body has an inner cavity formed therein, and the spinneret hole penetrates the inner cavity in the vertical direction;

[0012] A flow divider plate is fixed inside the cavity, and a single C-shaped hole is formed on the flow divider plate. The single C-shaped hole is aligned with one of the C-shaped parts.

[0013] The inner cavity and the flow divider plate form a second melt cavity, which is connected to another C-shaped section at the bottom of the spinneret body. Positioning pins are fitted onto the flow divider plate and the spinneret body.

[0014] The first melt chamber is located above the spinneret, while the upper surface of the diverter plate blocks one side of the C-shaped section of the spinneret hole at the top of the spinneret. Therefore, the melt in the first melt chamber can only pass through one C-shaped section and enter the single C-shaped hole. The first melt in the single C-shaped hole enters one of the C-shaped sections of the spinneret hole at the bottom of the spinneret. At the same time, the melt in the second melt chamber also enters the other C-shaped section at the bottom of the spinneret. Since the two C-shaped sections are connected, the two melts are bonded together to form a chemical fiber containing two materials.

[0015] This invention is further configured such that: the number of C-shaped portions of the spinneret is three or more; the C-shaped portion is a C-shaped edge; the joint of two adjacent C-shaped edges is connected by rounded corners. Three or more C-shaped edges form a concave polygonal shape, from which the melt is extruded from the concave polygonal spinneret. In the middle recess of each concave edge: the hole wall is closer to the center of the cross-section, and the melt experiences stronger shearing action from the hole wall when flowing through it (similar to being "compressed"). The orientation of the molecular chains along the flow direction is more pronounced, and the elastic potential energy is mainly stored on the outside of the recess—compared to ordinary straight edges, the elastic potential energy density here is higher, and the expansion driving force is stronger; in the polygonal corner area: because the hole design retains sharp corners (or relatively sharp transitions), the shear stress is concentrated on the inside of the sharp corner when the melt flows through it, and the elastic potential energy is mainly stored on the outside of the sharp corner. However, due to the balancing effect of the concave edges, the potential energy distribution at the sharp corner is more concentrated. The design of the concave edge complements the outward expansion trend of the melt. In the middle of the concave edge, after the melt exits the mold, the elastic recovery direction is outward (perpendicular to the tangent direction of the concave edge), and its expansion amount fills the "concave gap" of the original hole shape, so that the originally concave edge becomes a straight line after expansion (the concavity is completely compensated). In the corner area, because the potential energy is concentrated on the outside of the sharp corner, the expansion direction after exiting the mold is directionally diffused along the outside of the sharp corner. And because of the constraint balance of the concave edge, the expansion amount is controlled within the range of "not blunting the sharp corner", and the sharp corner shape is ultimately preserved.

[0016] The number of C-shaped sections of the spinneret is three, and the spinneret is in the shape of a concave triangle.

[0017] The number of C-shaped sections of the spinneret is 4, and the spinneret is in the shape of a concave quadrilateral.

[0018] The number of C-shaped sections of the spinneret is 5, and the spinneret is in the shape of a concave pentagon.

[0019] The outstanding effect of this utility model is:

[0020] Compared to existing technologies, this method utilizes a structure consisting of two or more C-shaped sections arranged back-to-back. It leverages the characteristic that the melt expands more significantly towards the C-shaped opening after passing through the spinneret, and the pre-concave design of the spinneret counteracts uneven melt expansion. For two back-to-back C-shaped sections, the synthetic fiber expands uniformly outward in all directions to form a circular cross-section. For three or more back-to-back C-shaped sections forming a concave polygon, the synthetic fiber cross-section forms a regular polygon, thus achieving precise control over the cross-sectional shape of the synthetic fiber and meeting diverse production needs. Furthermore, by incorporating structures such as a flow divider and a second melt chamber, it is possible to produce synthetic fibers composed of two different materials while ensuring that their cross-sectional shape meets requirements. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the spinneret structure;

[0022] Figure 2 for Figure 1 A magnified view of a specific area (A);

[0023] Figure 3 for Figure 1 A sectional view of BB;

[0024] Figure 4 for Figure 3 A magnified view of a portion of C;

[0025] Figure 5 for Figure 3 A sectional view of DD;

[0026] Figure 6 This is a schematic diagram of Example 2 when the number of C-shaped parts is 3;

[0027] Figure 7 This is a schematic diagram of Example 2 when the number of C-shaped parts is 4;

[0028] Figure 8 This is a schematic diagram of Example 2 when the number of C-shaped parts is 5.

[0029] Reference numerals: 1. Spinneret body; 11. Inner cavity; 12. Diverter plate; 13. Single C-shaped hole; 14. Second melt cavity; 15. Positioning pin; 2. Spinneret hole; 21. C-shaped section; 211. C-shaped slit; 212. Vertical slit; 214. C-shaped edge; 215. Rounded corner. Detailed Implementation

[0030] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0031] The following is for reference Figures 1 to 8The present invention will be described as follows:

[0032] A type of reverse C-combination spinneret, such as Figure 1 As shown, it includes a spinneret body 1, on which a plurality of rectangular arrays of spinneret holes 2 are formed, and the spinneret holes 2 are composed of two or more C-shaped parts 21 arranged back to back. Example 1

[0033] When there are two C-shaped parts 21, such as Figure 2 As shown, the C-shaped part 21 is a C-shaped seam 211. The C-shaped seams 211 of the two C-shaped parts 21 are connected. The side of the C-shaped seam 211 away from the opening is a vertical seam 212. The C-shaped seams 211 of the two C-shaped parts 21 share a vertical seam 212.

[0034] like Figure 3 , Figure 4 , Figure 5 As shown, the spinneret body 1 has an inner cavity 11 formed inside, and the spinneret hole 2 passes through the inner cavity 11 in the vertical direction. A flow divider plate 12 is fixed inside the inner cavity 11. A single C-shaped hole 13 is formed on the flow divider plate 12. The single C-shaped hole 13 is aligned with one of the C-shaped parts 21. The inner cavity 11 and the flow divider plate 12 form a second melt cavity 14. The second melt cavity 14 is connected to another C-shaped part 21 at the lower part of the spinneret body 1. A positioning pin 15 is sleeved on the flow divider plate 12 and the spinneret body 1.

[0035] During operation, the area above the spinneret is the first melt chamber. The upper surface of the flow divider 12 blocks one side of the C-shaped portion 21 of the spinneret hole 2 at the top of the spinneret. The melt in the first melt chamber can only pass through one C-shaped portion 21 and enter the single C-shaped hole 13. The first melt in the single C-shaped hole 13 enters one of the C-shaped portions 21 of the spinneret hole 2 at the bottom of the spinneret. At the same time, the melt in the second melt chamber 14 also enters the other C-shaped portion 21 at the bottom of the spinneret. Since the two C-shaped portions 21 are connected, the two melts are bonded together to form a chemical fiber containing two materials. Furthermore, since the two C-shaped portions 21 are back-to-back, after the melt exits the mold, the elastic recovery direction of the melt in the middle bonding area expands outward to both sides, symmetrically, and with balanced expansion force. The elastic recovery direction of the melt in the opening areas on both sides expands outward. The expansion forces on both sides complement each other in the radial direction (360° direction), achieving uniform expansion in the entire circumference, so that the cross-section of the chemical fiber forms a complete circle. Example 2

[0036] When the number of C-shaped portions 21 of the spinneret 2 is 3 or more, such as Figure 6As shown, the C-shaped section 21 consists of C-shaped edges 214, and the joints of two adjacent C-shaped edges 214 are connected by rounded corners 215. Three or more C-shaped edges 214 form a concave polygonal shape. When the melt is extruded from the concave polygonal spinneret 2, the melt at the middle recess of each concave edge elastically recovers outward after exiting the mold, and the expansion fills the "concave gap" of the original hole shape, so that the originally concave edge becomes a straight line after expansion; the melt at the corner expands in a directional diffusion along the outside of the sharp corner, retaining the sharp corner shape, thereby forming a regular polygonal shape in the cross-section of the chemical fiber.

[0037] When the number of C-shaped portions 21 of the spinneret 2 is 3, the spinneret is in a concave triangular shape, such as... Figure 6 As shown; when the number of C-shaped portions of the spinneret is 4, the spinneret has a concave quadrilateral shape, such as... Figure 7 As shown; when the number of C-shaped portions of the spinneret is 5, the spinneret is in the shape of a concave pentagon, as shown. Figure 8 As shown.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model. These improvements and modifications assumed above should also be considered within the protection scope of the present utility model.

Claims

1. A reverse C-type spinneret, comprising a spinneret body (1), characterized in that: The spinneret body (1) has a plurality of rectangular arrays of spinneret holes (2), and the spinneret holes (2) are composed of two or more C-shaped parts (21) arranged back to back.

2. The reverse C-combination spinneret according to claim 1, characterized in that: There are two C-shaped parts (21); The C-shaped part (21) is a C-shaped seam (211), and the C-shaped seams (211) of the two C-shaped parts (21) are connected.

3. A reverse C-type spinneret according to claim 2, characterized in that: The C-shaped seam (211) is a vertical seam (212) on the side away from the opening, and the C-shaped seams (211) of the two C-shaped parts (21) share a vertical seam (212).

4. A reverse C-type spinneret according to claim 3, characterized in that: The spinneret body (1) has an inner cavity (11) formed inside, and the spinneret hole (2) penetrates the inner cavity (11) in the vertical direction. A flow divider plate (12) is fixed inside the inner cavity (11). A single C-shaped hole (13) is formed on the flow divider plate (12). The single C-shaped hole (13) is aligned with one of the C-shaped parts (21). The inner cavity (11) and the flow divider (12) form a second melt cavity (14), which is connected to another C-shaped part (21) at the bottom of the spinneret body (1).

5. A reverse C-type spinneret according to claim 4, characterized in that: Positioning pins (15) are fitted onto the diverter plate (12) and the spinneret body (1).

6. A reverse C-combination spinneret according to claim 1, characterized in that: The number of C-shaped portions (21) of the spinneret (2) is three or more; The C-shaped part (21) is a C-shaped edge (214); The junctions of two adjacent C-shaped edges (214) are connected by fillets (215).

7. A reverse C-type spinneret according to claim 6, characterized in that: The number of C-shaped parts (21) of the spinneret (2) is 3, and the spinneret (2) is in the shape of a concave triangle.

8. A reverse C-type spinneret according to claim 6, characterized in that: The number of C-shaped parts (21) of the spinneret (2) is 4, and the spinneret (2) is a concave quadrilateral shape.

9. A reverse C-type spinneret according to claim 6, characterized in that: The number of C-shaped parts (21) of the spinneret (2) is 5, and the spinneret (2) is in the shape of a concave pentagon.

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