An impregnation die, impregnation equipment and impregnation method

Abstract

This application provides an impregnation die head, impregnation equipment, and impregnation method. The impregnation die head includes a housing, a first partition, and a second partition. The housing has an inlet and an outlet, and a first chamber and a second chamber are formed inside the housing, communicating with each other. The first chamber communicates with the inlet, and the second chamber communicates with the outlet. The inlet includes a first sub-inlet and a second sub-inlet spaced apart. The first partition is located in the first chamber and is used to disperse fiber bundles located on both sides of the first partition. The first partition has a first feed inlet and a second feed inlet, which face both sides of the first partition, respectively. The second partition is located in the second chamber and is used to disperse fiber bundles located on both sides of the second partition. The housing has a third feed inlet and a fourth feed inlet, which face both sides of the second partition, respectively. This application improves the impregnation effect of fiber bundles.

Description

Technical Field

[0001] This application relates to the field of polymer material molding and processing technology, specifically to an impregnation die, impregnation equipment, and impregnation method. Background Technology

[0002] Long fiber reinforced thermoplastic composites, represented by LFT and prepreg composite strips, have received high attention in the automotive field due to their excellent mechanical properties and high cost performance, which helps to achieve automotive lightweighting. They are widely used in parts such as battery covers, power battery bottom protection plates, instrument panel frames, and door base plates.

[0003] Since the glass fiber and resin cannot be melt-impregnated by physical blending in a twin-screw extruder, the current process of pultrusion is used to achieve the impregnation of glass fiber and resin. However, the current pultrusion process cannot achieve complete impregnation of resin and glass fiber. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, this application provides an impregnation die head, an impregnation device, and an impregnation method.

[0005] The specific technical solution is as follows:

[0006] An impregnation die head includes a housing, a first separator, and a second separator; The housing is provided with an inlet and an outlet, and a first chamber and a second chamber are formed inside the housing. The first chamber is connected to the inlet, and the second chamber is connected to the outlet. The inlet includes a first sub-inlet and a second sub-inlet that are spaced apart. The first separator is located in the first chamber and is used to disperse the fiber bundles located on both sides of the first separator. The first separator is provided with a first inlet and a second inlet, which are respectively facing the two sides of the first separator. The second separator is located in the second chamber and is used to disperse the fiber bundles located on both sides of the second separator. The housing is provided with a third inlet and a fourth inlet, which are respectively oriented towards both sides of the second separator.

[0007] In one embodiment, the inner cavity of the housing has a first inner wall and a second inner wall, the first inner wall has a first convex surface, the second inner wall has a second convex surface, the first convex surface and the second convex surface are arranged opposite to each other to form a convex surface group, the convex surface group dividing the inner cavity into a first chamber and a second chamber.

[0008] In one embodiment, the first separator has a first end and a second end arranged sequentially along the direction of fiber bundle movement. The outer perimeter of the first end of the first separator is greater than the outer perimeter of the second end of the first separator, and in a cross section perpendicular to the horizontal plane, the angle between the common tangent of the first end and the second end of the first separator and the horizontal plane is between 20° and 40°. And / or, the second separator also has a first end and a second end arranged sequentially along the direction of fiber bundle movement, the outer perimeter length of the second end of the second separator is greater than the outer perimeter length of the first end of the second separator, and in a cross section perpendicular to the horizontal plane, the angle between the common tangent of the first end of the second separator and the second end of the second separator and the horizontal plane is between 20° and 40°.

[0009] In one embodiment, the outer perimeter length of the second end of the first separator is greater than the outer perimeter length of the second end of the second separator.

[0010] In one embodiment, the first sub-inlet and / or the second sub-inlet are provided with a guide, the guide having an arcuate surface for contacting the fiber bundle.

[0011] In one embodiment, the first inner wall has two or more first convex surfaces, and the second inner wall has two or more second convex surfaces to form two or more sets of said convex surfaces; The two or more convex surface groups divide the inner cavity into a first chamber, a second chamber, and one or more third chambers, which are arranged sequentially along the direction of fiber bundle movement.

[0012] In one embodiment, the first convex surface is arc-shaped, wavy, rectangular, or V-shaped in a cross-section perpendicular to the horizontal plane; And / or, the second convex surface is arc-shaped, wavy, rectangular, or V-shaped in a cross-section perpendicular to the horizontal plane.

[0013] In one embodiment, a middle portion of the first partition is formed between a first end and a second end of the first partition, and the outer perimeter length of the middle portion of the first partition is between the outer perimeter length of the first end and the outer perimeter length of the second end of the first partition. And / or, a middle portion of the second partition is formed between the first end and the second end of the second partition, and the outer perimeter length of the middle portion of the second partition is between the outer perimeter length of the first end and the outer perimeter length of the second end of the second partition.

[0014] An impregnation apparatus, comprising the aforementioned impregnation die head.

[0015] An impregnation method, applied to the impregnation equipment, the impregnation method comprising: The fiber bundle includes a first part and a second part. The first part is sent into the first chamber through the first sub-inlet, and the second part is sent into the first chamber through the second sub-inlet. The first part is located on the first side of the first partition, and the second part is located on the second side of the first partition, with the first partition dispersing both the first part and the second part. Melt is fed into the first chamber through the first inlet and the second inlet. Melt output through the first inlet impregnates the first side of the first part, and melt output through the second inlet impregnates the first side of the second part. After the above impregnation is completed, the first part and the second part are moved from the first chamber to the second chamber, and the first part and the second part are dispersed by the second separator; Melt is fed into the second chamber through the third feed port and the fourth feed port. Melt output through the third feed port impregnates the second side of the first part, and melt output through the fourth feed port impregnates the second side of the second part. After the above impregnation is completed, the first part and the second part are exported through the outlet.

[0016] This application has at least the following beneficial effects: This application provides an impregnation die head, impregnation equipment, and impregnation method. The impregnation die head includes a housing, a first partition, and a second partition. The housing is provided with an inlet and an outlet. A first chamber and a second chamber are formed inside the housing and communicate with each other. The first chamber communicates with the inlet, and the second chamber communicates with the outlet. The inlet includes a first sub-inlet and a second sub-inlet that are spaced apart. The first partition is located in the first chamber and is used to disperse fiber bundles located on both sides of the first partition. The first partition is provided with a first feed inlet and a second feed inlet, which face the two sides of the first partition, respectively. The second partition is located in the second chamber and is used to disperse fiber bundles located on both sides of the second partition. The housing is provided with a third feed inlet and a fourth feed inlet, which face the two sides of the second partition, respectively.

[0017] This application disperses fiber bundles located on both sides of a first separator and a second separator. By distributing the first and third feed ports on both sides of a portion of the fiber bundles, omnidirectional impregnation of that portion of the fiber bundles is achieved. Furthermore, by distributing the second and fourth feed ports on both sides of another portion of the fiber bundles, omnidirectional impregnation of that other portion of the fiber bundles is achieved. This increases the impregnation rate and improves the impregnation effect of the fiber bundles, thus contributing to the complete impregnation of the fiber bundles.

[0018] Meanwhile, by providing a first partition in the first chamber and a second partition in the second chamber, this application provides varying impregnation pressure in the first and second chambers, thereby further improving the impregnation rate of the fiber bundle and helping to prevent fiber breakage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 Schematic cross-sectional structure of the impregnation die head provided in Example 1 Figure 1 ; Figure 2 Schematic cross-sectional structure of the impregnation die head provided in Example 1 Figure 2 ; Figure 3 The flowchart is for the impregnation method provided in Example 3.

[0021] Figure label: 1-Shell; 2-First partition; 3-Second partition; 4-First feed inlet; 5-Second feed inlet; 6-Third feed inlet; 7-Fourth feed inlet; 8-Guide; 9-Fiber bundle; 11-Inner cavity; 12-First chamber; 13-Second chamber; 15-Outlet; 16-First inner wall; 17-Second inner wall; 18-Third chamber; 21-First end of the first partition; 22-Second end of the first partition; 23-Middle part of the first partition; 31-First end of the second partition; 32-Second end of the second partition; 33-Middle part of the second partition; 81-Arc-shaped surface; 91-First part; 92-Second part; 141-First sub-inlet; 142-Second sub-inlet; 161-First convex surface; 171-Second convex surface; α-First included angle; β-Second included angle. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] In the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides an immersion die head, including a housing 1, a first separator 2, and a second separator 3; The housing 1 is provided with an inlet and an outlet 15. The housing 1 has a first chamber 12 and a second chamber 13 that are interconnected. The first chamber 12 is connected to the inlet, and the second chamber 13 is connected to the outlet 15. The inlet includes a first sub-inlet 141 and a second sub-inlet 142 that are spaced apart. The first partition 2 is located in the first chamber 12 and is used to disperse the fiber bundles located on both sides of the first partition 2. The first partition 2 is provided with a first feed inlet 4 and a second feed inlet 5, which are respectively facing the two sides of the first partition 2. The second partition 3 is located in the second chamber 13 and is used to disperse the fiber bundles located on both sides of the second partition 3. The housing 1 is provided with a third feed port 6 and a fourth feed port 7, which are respectively oriented towards the two sides of the second partition 3.

[0026] Specifically, the fiber bundle includes a first part 91 and a second part 92.

[0027] Specifically, the first part 91 includes two or more fiber filaments. The first part 91 enters the first chamber 12 through the first sub-inlet 141. The first part 91 is located on the first side of the first partition 2, and the first side of the first partition 2 is used to disperse the first part 91. The second part 92 includes two or more fiber filaments. The second part 92 enters the first chamber 12 through the second sub-inlet. The second part 92 is located on the second side of the first partition 2, and the second side of the first partition 2 is used to disperse the second part 92.

[0028] Specifically, when the first part 91 and the second part 92 move from the first chamber 12 into the second chamber 13, the first part 91 is located on the first side of the second partition 3, and the first side of the second partition 3 is used to disperse the first part 91; the second part 92 is located on the second side of the second partition 3, and the second side of the second partition 3 is used to disperse the second part 92.

[0029] In this embodiment, the fiber bundle 9 is divided into a first part 91 and a second part 92 through the first sub-inlet 141 and the second sub-inlet 142. The first part 91 and the second part 92 located on both sides of the first separator 2 are dispersed through the first separator 2. The portion of the first part 91 near the first separator 2 is impregnated through the first feed inlet 4, and the portion of the second part 92 near the first separator 2 is impregnated through the second feed inlet 5.

[0030] At the same time, the first part 91 and the second part 92 located on both sides of the second partition 3 are dispersed by the second partition 3, and the first part 91 and the second part 92 are kept separated by the second partition 2. The part of the first part 91 away from the second partition 3 is impregnated by the third feed port 6, and the part of the second part 92 away from the second partition 3 is impregnated by the fourth feed port 7.

[0031] This embodiment cleverly positions the four feed ports, with the first feed port 4 and the third feed port 6 distributed on both sides of the first part 91, achieving omnidirectional impregnation of the first part 91; and the second feed port 5 and the fourth feed port 7 distributed on both sides of the second part 92, achieving omnidirectional impregnation of the second part 92. This embodiment improves the impregnation rate of the fiber bundle 9, enhances the impregnation effect of the fiber bundle 9, and helps to achieve complete impregnation of the fiber bundle 9.

[0032] Meanwhile, this embodiment provides varying impregnation pressures in the first chamber 12 and the second chamber 13 by providing a first partition 2 in the first chamber 12 and a second partition 3 in the second chamber 13. Providing varying impregnation pressures further improves the impregnation rate of the fiber bundle 9 and helps prevent fiber breakage.

[0033] In one embodiment, the first sub-inlet 141 and the second sub-inlet 142 are arranged vertically relative to the horizontal plane, so that the first part 91 and the second part 92 are located on the upper and lower sides of the first partition 2 and on the upper and lower sides of the second partition 3, respectively.

[0034] In one embodiment, there are multiple first sub-inlet ports 141, which are spaced apart from each other; there are also multiple second sub-inlet ports 142, which are spaced apart from each other.

[0035] like Figure 1 and Figure 2 As shown, in one embodiment, the first sub-inlet 141 and / or the second sub-inlet 142 are provided with guide members 8. The guide members 8 are provided with arc-shaped surfaces 81, which are used to contact the fiber bundle 9. In this embodiment, the fiber bundle 9 enters the first chamber 12 through the guide members 8. The guide members 8 are used to provide guiding assistance for the fiber bundle 9. At the same time, the guide members 8 provide tension through the arc-shaped surfaces 81 to pre-disperse the fiber bundle 9 when it enters the first chamber 12, thereby reducing the dispersion intensity of the first separator 2.

[0036] In one embodiment, the guide 8 is cylindrical, and the sidewalls of the cylindrical guide 8 form an arcuate surface 81.

[0037] like Figure 1 and Figure 2 As shown, in one embodiment, the inner cavity 11 of the housing 1 has a first inner wall 16 and a second inner wall 17. The first inner wall 16 has a first convex surface 161, and the second inner wall 17 has a second convex surface 171. The first convex surface 161 and the second convex surface 171 are arranged opposite to each other to form a convex surface group, which divides the inner cavity 11 into a first chamber 12 and a second chamber 13. The first convex surface 161 and the second convex surface 171 are arranged opposite to each other and spaced apart from each other, so that the first chamber 12 and the second chamber 13 are in communication with each other.

[0038] In this embodiment, the inner cavity 11 is divided into a first chamber 12 and a second chamber 13 by the cooperation of the first convex surface 161 and the second convex surface 171. At the same time, the first chamber 12 and the second chamber 13 are interconnected to realize the rectification function, which is beneficial to stabilize the melt pressure in the chamber. It can also replenish the melt during the impregnation of the fiber bundle 9 and make the melt flow stably on the surface of the fiber bundle 9.

[0039] Specifically, the first convex surface 161 is arc-shaped, wavy, rectangular, or V-shaped in a cross-section perpendicular to the horizontal plane, which helps to stabilize the melt pressure in the chamber and improve the rectification effect.

[0040] Specifically, the second convex surface 171 is arc-shaped, wavy, rectangular, or V-shaped in a cross-section perpendicular to the horizontal plane, which helps to stabilize the melt pressure in the chamber and improve the rectification effect.

[0041] like Figure 1 and Figure 2 As shown, in one embodiment, the first inner wall 16 has two or more first convex surfaces 161, and the second inner wall 17 has two or more second convex surfaces 171 to form two or more convex surface groups. The two or more convex surface groups divide the inner cavity into a first chamber 12, a second chamber 13, and one or more third chambers 18. The first chamber 12, the second chamber 13, and one or more third chambers 18 are arranged sequentially along the direction of movement of the fiber bundle 9. The third chamber 18, which is located last in the sequence, is connected to the outlet 15.

[0042] This embodiment increases the number of the first convex surface 161 and the second convex surface 171, and adds one or more third chambers 18 to further stabilize the melt pressure in the chambers, and to allow the fiber bundles 9 to re-enter the third chamber 18 for supplementary impregnation after being impregnated at the second separator 3, thereby improving the impregnation effect of the fiber bundles 9.

[0043] like Figure 1 and Figure 2 As shown, in one embodiment, the first separator 2 has a first end 21 and a second end 22 arranged sequentially along the direction of fiber bundle movement. The outer perimeter length of the first end 21 is greater than the outer perimeter length of the second end 22. In a cross section perpendicular to the horizontal plane, the angle between the common tangent of the first end 21 and the second end 22 of the first separator 2 and the horizontal plane is a first angle α, where 20°≤α≤40°.

[0044] This embodiment provides inconsistent impregnation pressure by setting a first separator 2 at both ends, thereby providing a variable impregnation pressure, which helps to improve the impregnation effect of the fiber bundle 9, and the variable impregnation pressure helps to prevent fiber breakage.

[0045] Meanwhile, this embodiment also limits the size of both ends of the first separator 2 so that the first separator 2 can cause a sufficiently varied impregnation pressure in the first chamber 12, thereby achieving the impregnation of the fiber bundle 9, while ensuring that the varied impregnation pressure does not have an adverse effect on the fiber bundle.

[0046] Specifically, the first end 21 and the second end 22 of the first separator are spherical, but not limited to this.

[0047] like Figure 1 and Figure 2As shown, in one embodiment, the second separator 3 also has a first end 31 and a second end 32 arranged sequentially along the direction of fiber bundle movement, and the outer perimeter length of the second end 32 is greater than the outer perimeter length of the first end 31. Furthermore, in a cross-section perpendicular to the horizontal plane, the angle between the common tangent of the first end 31 and the second end 32 of the second separator 3 and the horizontal plane is a second angle β, where 20° ≤ β ≤ 40°.

[0048] This embodiment provides inconsistent impregnation pressure by setting a second separator 3 at both ends, thereby providing a variable impregnation pressure, which helps to improve the impregnation effect of the fiber bundle 9, and the variable impregnation pressure helps to prevent fiber breakage.

[0049] Meanwhile, this embodiment also limits the size of both ends of the second separator 3 so that the second separator 3 can cause a sufficiently varied impregnation pressure in the second chamber 13, thereby achieving the impregnation of the fiber bundle 9, while ensuring that the varied impregnation pressure does not have an adverse effect on the fiber bundle.

[0050] Specifically, the first end 31 of the second separator and the second end 32 of the second separator are spherical, but not limited to this.

[0051] In one embodiment, the outer periphery length of the second end 22 of the first separator is greater than the outer periphery length of the second end 32 of the second separator, so as to provide different melt pressures in the first chamber 12 and the second chamber 13, which is conducive to promoting melt flow between the first chamber 12 and the second chamber 13.

[0052] like Figure 1 and Figure 2 As shown, in one embodiment, a middle portion 23 of the first separator is formed between the first end 21 and the second end 22 of the first separator. The outer perimeter length of the middle portion 23 of the first separator is between the outer perimeter length of the first end 21 and the outer perimeter length of the second end 22 of the first separator. In this embodiment, by giving the first end 21, the second end 22 and the middle portion 23 of the first separator different outer perimeter lengths, the frequency of impregnation pressure variation is increased, which helps to improve the impregnation effect of the fiber bundle 9.

[0053] like Figure 1 and Figure 2As shown, in one embodiment, a middle portion 33 of the second separator is formed between the first end 31 and the second end 32 of the second separator. The outer perimeter length of the middle portion 33 of the second separator is between the outer perimeter length of the first end 21 and the outer perimeter length of the second end 32 of the second separator. In this embodiment, by giving the first end 31, the second end 32 and the middle portion 33 of the second separator different outer perimeter lengths, the frequency of impregnation pressure variation is increased, which helps to improve the impregnation effect of the fiber bundle 9.

[0054] Example 2 This embodiment provides an impregnation device, including the impregnation die head described in Embodiment 1.

[0055] In this embodiment, the fiber bundle is divided into a first part and a second part through the first sub-inlet and the second sub-inlet. The first part and the second part located on both sides of the first separator are dispersed through the first separator. The portion of the first part near the first separator is impregnated through the first feed inlet, and the portion of the second part near the first separator is impregnated through the second feed inlet.

[0056] Simultaneously, the first part and the second part located on both sides of the second separator are dispersed by the second separator, and the first part and the second part are kept separated by the second separator. The first part is impregnated on the side away from the second separator through the third feed port, and the second part is impregnated on the side away from the second separator through the fourth feed port.

[0057] This embodiment cleverly positions the four feed inlets, with the first and third feed inlets distributed on both sides of the first part, achieving omnidirectional impregnation of the first part; and the second and fourth feed inlets distributed on both sides of the second part, achieving omnidirectional impregnation of the second part. This embodiment improves the impregnation rate of the fiber bundle, enhances the impregnation effect of the fiber bundle, and helps to achieve complete impregnation of the fiber bundle.

[0058] Meanwhile, this embodiment provides varying impregnation pressure in the first and second chambers by providing a first partition in the first chamber and a second partition in the second chamber, thereby further improving the impregnation rate of the fiber bundle and helping to prevent fiber breakage.

[0059] Example 3 like Figure 3 As shown, this embodiment provides an impregnation method applied to the impregnation equipment of Embodiment 2. The impregnation method includes: S1. The fiber bundle includes a first part and a second part. The first part is sent into the first chamber through the first sub-inlet, and the second part is sent into the first chamber through the second sub-inlet. S2. The first part is located on the first side of the first partition, and the second part is located on the second side of the first partition. The first partition disperses the first part and the second part. S3. Melt is fed into the first chamber through the first feed port and the second feed port. The melt output through the first feed port impregnates the first side of the first part, and the melt output through the second feed port impregnates the first side of the second part. S4. After the above impregnation is completed, the first part and the second part are moved from the first chamber to the second chamber, and the first part and the second part are dispersed by the second separator. S5. Melt is fed into the second chamber through the third feed port and the fourth feed port. The melt output through the third feed port impregnates the second side of the first part, and the melt output through the fourth feed port impregnates the second side of the second part. S6. After completing the above impregnation, export the first part and the second part through the outlet.

[0060] This embodiment improves the impregnation rate and effect of the fiber bundle by dispersing the fiber bundle into a first part and a second part, and by impregnating the first part in all directions through the first feed port and the third feed port distributed on both sides of the first part, and by impregnating the second part in all directions through the second feed port and the fourth feed port distributed on both sides of the second part, which helps to achieve complete impregnation of the fiber bundle.

[0061] Meanwhile, this embodiment uses a first separator and a second separator to provide varying impregnation pressure in the first chamber and the second chamber, which further improves the impregnation rate of the fiber bundle and helps prevent fiber breakage.

[0062] Note that the above description is merely a preferred embodiment and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of this application, and the scope of this application is determined by the scope of the appended claims.

[0063] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An impregnation die head, characterized in that, Includes a housing, a first partition, and a second partition; The housing is provided with an inlet and an outlet, and a first chamber and a second chamber are formed inside the housing. The first chamber is connected to the inlet, and the second chamber is connected to the outlet. The inlet includes a first sub-inlet and a second sub-inlet that are spaced apart. The first separator is located in the first chamber and is used to disperse the fiber bundles located on both sides of the first separator. The first separator is provided with a first inlet and a second inlet, which are respectively facing the two sides of the first separator. The second separator is located in the second chamber and is used to disperse the fiber bundles located on both sides of the second separator. The housing is provided with a third inlet and a fourth inlet, which are respectively oriented towards both sides of the second separator. The inner cavity of the shell has a first inner wall and a second inner wall. The first inner wall has a first convex surface and the second inner wall has a second convex surface. The first convex surface and the second convex surface are arranged opposite to each other to form a convex surface group. The convex surface group is used to gather the dispersed fiber filaments of the first separator. The convex surface group divides the inner cavity into the first chamber and the second chamber. The first separator has a first end and a second end arranged sequentially along the direction of fiber bundle movement. The outer perimeter of the first end of the first separator is greater than the outer perimeter of the second end of the first separator, and in a cross section perpendicular to the horizontal plane, the angle between the common tangent of the first end and the second end of the first separator and the horizontal plane is between 20° and 40°; and / or, the second separator also has a first end and a second end arranged sequentially along the direction of fiber bundle movement. The outer perimeter of the second end of the second separator is greater than the outer perimeter of the first end of the second separator, and in a cross section perpendicular to the horizontal plane, the angle between the common tangent of the first end and the second end of the second separator and the horizontal plane is between 20° and 40°; The middle portion of the first separator is formed between the first end and the second end of the first separator, and the outer perimeter length of the middle portion of the first separator is between the outer perimeter length of the first end and the outer perimeter length of the second end of the first separator; and / or, the middle portion of the second separator is formed between the first end and the second end of the second separator, and the outer perimeter length of the middle portion of the second separator is between the outer perimeter length of the first end and the outer perimeter length of the second end of the second separator.

2. The impregnation die head according to claim 1, characterized in that, The outer perimeter of the second end of the first separator is greater than the outer perimeter of the second end of the second separator.

3. The impregnation die head according to claim 1, characterized in that, The first sub-inlet and / or the second sub-inlet are provided with guide members, the guide members being provided with arc-shaped surfaces, the arc-shaped surfaces being used to contact the fiber bundles.

4. The impregnation die head according to claim 1, characterized in that, The first inner wall has two or more first convex surfaces, and the second inner wall has two or more second convex surfaces, to form two or more sets of said convex surfaces; The two or more convex surface groups divide the inner cavity into a first chamber, a second chamber, and one or more third chambers, which are arranged sequentially along the direction of fiber bundle movement.

5. The impregnation die head according to claim 1 or 4, characterized in that, The first convex surface is arc-shaped, wavy, rectangular, or V-shaped in a cross-section perpendicular to the horizontal plane; And / or, the second convex surface is arc-shaped, wavy, rectangular, or V-shaped in a cross-section perpendicular to the horizontal plane.

6. An impregnation apparatus, characterized in that, Includes the immersion die head as described in any one of claims 1-5.

7. An impregnation method, characterized in that, The impregnation method, applied to the impregnation apparatus of claim 6, comprises: The fiber bundle includes a first part and a second part. The first part is sent into the first chamber through the first sub-inlet, and the second part is sent into the first chamber through the second sub-inlet. The first part is located on the first side of the first partition, and the second part is located on the second side of the first partition, with the first partition dispersing both the first part and the second part. Melt is fed into the first chamber through the first inlet and the second inlet. Melt output through the first inlet impregnates the first side of the first part, and melt output through the second inlet impregnates the first side of the second part. After the above impregnation is completed, the first part and the second part are moved from the first chamber to the second chamber, and the first part and the second part are dispersed by the second separator; Melt is fed into the second chamber through the third feed port and the fourth feed port. Melt output through the third feed port impregnates the second side of the first part, and melt output through the fourth feed port impregnates the second side of the second part. After the above impregnation is completed, the first part and the second part are exported through the outlet.

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