Fiber deposition method capable of improving uniformity

Abstract

The invention discloses a fiber deposition method capable of improving uniformity. The method comprises the following steps: applying a spinning electric field between a receiving device and a nozzle device; a concave-convex structure is arranged on the receiving device, electric field intensity differences are formed on the concave-convex structure, so that high electric field intensity positions and low electric field intensity positions are formed on the receiving device, and the multiple high electric field intensity positions and the multiple low electric field intensity positions are arranged in a staggered mode in the advancing direction and the width direction. The substrate advances in an advancing direction and passes through alternately changing high and low electric field intensity levels. The attraction force of the high-electric-field-intensity positions to the jet flow in the air is larger than that of the low-electric-field-intensity positions to the jet flow, so that the jet flow is subjected to the attraction force of deposited fibers on a base material, the attraction force brought by the high-electric-field-intensity positions is increased, the staggered high-electric-field-intensity positions form staggered attraction force to the jet flow formed by the multiple spray heads, and the jet flow is more attractive. And the fibers deposited on the base material are distributed more uniformly.

Description

Technical Field

[0001] The invention relates to the technical field of electrostatic spinning, and in particular to a fiber deposition method capable of improving uniformity. Background Art

[0002] In the nozzle-type electrospinning process, since there is a distance between the multiple nozzles that spray the polymer solution, and the jets formed by each nozzle will interfere and repel each other under the action of static electricity, the deposited fiber membrane will have uneven spacing streaks in the width direction.

[0003] Although multiple groups of nozzles are arranged in a staggered manner in the direction of movement of the substrate, and multiple nozzles in the front and rear groups are arranged in a staggered manner to partially compensate for the unevenness, the fiber film deposited first on the substrate will still have obvious unevenness because the fiber area deposited first on the substrate will attract the jet of the subsequent nozzle.

[0004] Reference Figure 1 , including a front nozzle 12 at the front side of the substrate in the advancing direction, and a rear nozzle 11 at the rear side of the front nozzle 12. The same position of the substrate is first deposited by the jet of the rear nozzle 11, and then by the jet of the front nozzle 12. The jet of the rear nozzle 11 is deposited at a certain position first, and the jets of the two adjacent rear nozzles 11 are spaced apart during deposition due to mutual repulsion; in order to make up for the interval between the deposited fibers of the two rear nozzles 11, the front nozzle 12 is currently arranged between the two rear nozzles 11 in the width direction of the substrate. However, when the substrate moves to the position of the front nozzle 12, the jet formed by the front nozzle 12 is attracted and deviated by the deposited fibers of the rear nozzle 11. Referring to the schematic diagram of the jet deposition distribution on the receiving device 14 and the substrate 15 at the lower side, a relatively obvious gap 13 still appears in the area of ​​the substrate below the front nozzle 12, and the fiber deposition is still not uniform.

[0005] Therefore, a new fiber deposition method for spray-type electrospinning is needed to improve the uniformity of fiber deposition. Summary of the invention

[0006] The main purpose of the present invention is to provide a fiber deposition method that can improve uniformity, aiming to solve the technical problem that the fiber deposition uniformity of nozzle-type electrospinning in the prior art is not high enough.

[0007] To achieve the above object, the present invention provides a fiber deposition method capable of improving uniformity, comprising:

[0008] Applying a spinning electric field between the receiving device and the nozzle device, wherein the nozzle device comprises a plurality of nozzle assemblies sequentially arranged along the advancing direction of the substrate, each of the nozzle assemblies comprises a plurality of nozzles sequentially arranged at intervals along the width direction of the substrate, and the jets formed by the nozzles are deposited on the substrate on the receiving device;

[0009] The receiving device is provided with a concave-convex structure, and under the action of the spinning electric field, the receiving device forms an electric field strength difference on the concave-convex structure, so that a high electric field strength position with relatively high electric field strength and a low electric field strength position with relatively low electric field strength are formed on the receiving device, and a plurality of the high electric field strength positions and a plurality of the low electric field strength positions are arranged alternately in the forward direction and the width direction;

[0010] The substrate advances along the advancing direction on the receiving device and passes through the alternating high electric field strength position and the low electric field strength position. The high electric field strength position generates an attraction for the jet located above, so that the jet in the air is directed toward the corresponding high electric field strength position and deposited on the advancing substrate.

[0011] A concave-convex structure is arranged on the receiving device, and the concave-convex structure forms staggered high electric field strength positions and low electric field strength positions in the spinning electric field. The attraction of the high electric field strength position to the jet in the air is greater than the attraction of the low electric field strength position to the jet, so that in addition to the attraction of the fibers deposited on the substrate, the jet is also attracted by the high electric field strength position, thereby weakening the attraction of the deposited fibers to the jet. The staggered high electric field strength positions form staggered attractions to the multiple jets formed by the multiple nozzles, so that the fibers deposited on the substrate are more evenly distributed.

[0012] Preferably, the receiving device is provided with a receiving plane in contact with the substrate, and the concave-convex structure is provided on the receiving plane. The substrate passes over the receiving plane, and the jet is deposited on the substrate.

[0013] Preferably, the concave-convex structure comprises a plurality of first concavities arranged in a staggered manner, and the high electric field strength is located at the edge of the first concavity;

[0014] Alternatively, the concave-convex structure includes a plurality of first protrusions arranged in a staggered manner, and the high electric field strength is located at the protruding tops of the first protrusions.

[0015] Under the effect of the edge effect in the electric field, charges are easily gathered at the edge of the first depression or the protruding top of the first protrusion, making the electric field intensity higher, and positions other than the high electric field intensity position are low electric field intensity positions.

[0016] Preferably, a plurality of first groups arranged along the advancing direction are provided on the receiving plane, the first group includes a plurality of first recesses or a plurality of first protrusions arranged at intervals along the width direction, and the first recesses or the first protrusions in two adjacent first groups are alternately staggered in the width direction.

[0017] The first depressions or first protrusions in adjacent first groups are alternately staggered in the width direction. Taking the first depression as an example, the first depression located on the front side of the forward direction is staggered with the first depression located on the rear side of the forward direction, so that the jet of the nozzle located on the front side will shift toward the first depression located on the front side, and break away from the attraction of the deposited fibers formed by the first depression located on the rear side, so that the later deposited fibers are staggered with the already deposited fibers, thereby improving the uniformity of the fiber deposition distribution on the substrate.

[0018] Preferably, the receiving device comprises a fixed receiving plate, and the receiving plane is arranged on the receiving plate.

[0019] The positions of the fixed receiving plate, i.e., the high electric field strength position and the low electric field strength position, are fixed relative to the nozzle assembly. The deposited fibers attracted by a high electric field strength position on the substrate are basically fixedly formed in a range in the width direction. Multiple high electric field strength positions staggered in the width direction can form multiple basically fixed and staggered deposition ranges, so that the fibers of the substrate are more evenly distributed as a whole in the width direction.

[0020] Preferably, the receiving device comprises a conveyor belt, a side of the conveyor belt close to the substrate is the receiving plane, and a linear speed of the conveyor belt is different from a conveying speed of the substrate.

[0021] When the conveyor belt rotates, the position of the high electric field strength point on the conveyor belt corresponding to the nozzle will change, that is, the direction of the attraction on the jet changes, the deposition direction will change, and the conveyor belt and the substrate will produce relative movement. The position of the jet deposited on the substrate will change in the width direction, so that the position of the jet deposited on the substrate changes, which can break away from the attraction of the deposited fibers and improve the uniformity of the overall deposition of the substrate.

[0022] Preferably, the receiving device comprises a plurality of conductive conveying rollers, the plurality of conductive conveying rollers are arranged in sequence along the advancing direction, the concave-convex structure is arranged on the outer surface of the conductive conveying roller, and the conductive conveying roller rotates during the advancing process of the substrate.

[0023] As the substrate moves forward, the conductive conveying roller rotates, and the surface height of the concave-convex structure on the conductive conveying roller close to the substrate keeps changing, that is, the position of the high electric field strength bit keeps changing, so that the position of the high electric field strength bit within the corresponding range of the jet emitted by the nozzle keeps changing, that is, the direction of the attraction exerted on the jet changes, and the deposition direction changes, so that the position of the jet deposited on the substrate changes in the width direction, which can break away from the attraction of the deposited fibers and improve the uniformity of the overall deposition of the substrate.

[0024] Preferably, a plurality of second depressions are provided on the outer surface of the conductive conveying roller, the high electric field strength position is located at the edge of the second depression, and the plurality of second depressions are arranged alternately along the outer surface of the conductive conveying roller, and when the substrate moves forward through the conductive conveying roller, the plurality of second depressions on the rotating conductive conveying roller form the high electric field strength position and the low electric field strength position that change alternately;

[0025] Alternatively, a plurality of second protrusions are provided on the outer surface of the conductive conveying roller, the high electric field strength position is located at the protruding top of the second protrusion, and the plurality of second protrusions are arranged alternately along the outer surface of the conductive conveying roller. When the substrate moves forward through the conductive conveying roller, the plurality of second protrusions on the rotating conductive conveying roller form alternating high electric field strength positions and low electric field strength positions.

[0026] Under the effect of the edge effect in the electric field, charges are easily gathered at the edge of the second depression or the protruding top of the second protrusion, so that the electric field intensity is higher, and the positions other than the high electric field intensity positions are low electric field intensity positions.

[0027] Preferably, the outer surface of the conductive conveying roller is provided with an external thread, and the crest of the external thread close to the substrate is the position of high electric field strength.

[0028] The tooth top of the external thread close to the substrate is a high electric field strength position, and other positions such as the groove and tooth bottom of the thread are low electric field strength positions; the tooth top of the external thread is roughly in point contact with the substrate. During the advancement of the substrate, the contact point between the external thread and the substrate moves continuously in the width direction as the conductive conveying roller rotates, that is, the high electric field strength position moves continuously in the width direction, which can attract the jet to deposit at a variable position in the width direction of the substrate. There are multiple contact points on the external thread with the substrate, and multiple high electric field strength positions attract the jet in turn, so that the fiber can be deposited more evenly on the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of the effect of jet deposition in an electrospinning system of the prior art;

[0031] Figure 2 It is a schematic diagram of a top view structure of a receiving plane and a first recess according to Embodiment 1 and Embodiment 2 of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the forward direction of the first embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the effect of jet deposition of Example 1 and Example 2 of the present invention;

[0034] Figure 5 It is a schematic diagram of the top view of the structure of the third embodiment of the present invention;

[0035] Figure 6 It is a schematic diagram of a top view of the structure of the fourth embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the effect of jet deposition in Embodiment 3 and Embodiment 4 of the present invention.

[0037] In the accompanying drawings: 2-receiving device, 21-receiving plate, 22-first recess, 221-first group, 23-conductive conveying roller, 24-second recess, 25-external thread, 26-base, 3-nozzle device, 31-nozzle assembly, 311-nozzle, 4-substrate.

[0038] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] It should be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of technical personnel in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] like Figures 2 to 7 A fiber deposition method for improving uniformity is shown, comprising:

[0043] A spinning electric field is applied between the receiving device 2 and the nozzle device 3, wherein the nozzle device 3 includes a plurality of nozzle assemblies 31 sequentially arranged along the advancing direction of the substrate 4, each nozzle assembly 31 includes a plurality of nozzles 311 sequentially arranged at intervals along the width direction of the substrate 4, and the jets formed by the nozzles 311 are deposited on the substrate 4 on the receiving device 2; the nozzles 311 in adjacent nozzle assemblies 31 are staggered in the width direction. The nozzle device 3 is connected to the positive electrode, and the receiving device 2 is grounded or connected to the negative electrode, and a spinning electric field is formed after voltage is applied.

[0044] The receiving device 2 is provided with a concave-convex structure. Under the action of the spinning electric field, the receiving device 2 forms an electric field strength difference on the concave-convex structure, so that a high electric field strength position with relatively high electric field strength and a low electric field strength position with relatively low electric field strength are formed on the receiving device 2, and multiple high electric field strength positions and multiple low electric field strength positions are arranged alternately in the forward direction and the width direction;

[0045] The substrate 4 moves along the forward direction on the receiving device 2 and passes through alternating high electric field strength positions and low electric field strength positions. The high electric field strength position generates an attraction for the jet located above, causing the jet in the air to move toward the corresponding high electric field strength position and deposit on the moving substrate 4.

[0046] A concave-convex structure is arranged on the receiving device 2, and the concave-convex structure forms staggered high electric field strength positions and low electric field strength positions in the spinning electric field. The attraction of the high electric field strength position to the jet in the air is greater than the attraction of the low electric field strength position to the jet, so that in addition to the attraction of the fibers deposited on the substrate 4, the jet is also increased by the attraction brought by the high electric field strength position, thereby weakening the attraction of the deposited fibers to the jet. The staggered high electric field strength positions form staggered attractions to the multiple jets formed by the multiple nozzles 311, so that the fibers deposited on the substrate 4 are more evenly distributed.

[0047] In some specific embodiments, referring to Figures 2 to 4 The receiving device 2 is provided with a receiving plane in contact with the substrate 4, and the concavo-convex structure is provided on the receiving plane. The substrate 4 passes over the receiving plane, and the jet is deposited on the substrate 4.

[0048] Furthermore, the concave-convex structure includes a plurality of staggered first concavities 22, the high electric field strength is located at the edge of the first concavity 22, and the interior of the first concavity 22 and the planar area of ​​the receiving plane are low and high electric field strength positions. The first concavity 22 can be in the form of a groove or a hole, and the shape of the first concavity 22 can be circular or rectangular, etc.

[0049] Alternatively, the concave-convex structure includes a plurality of first protrusions arranged in a staggered manner, the high electric field strength position is located at the protruding top of the first protrusion, and other positions lower than the protruding top of the first protrusion are low and high electric field strength positions.

[0050] Under the action of the edge effect in the electric field, charges are easily gathered at the edge of the first recess 22 or the protruding top of the first protrusion, making the electric field strength higher. As long as the electric field strength at this position is high, the jet is easily attracted to this position, which can be regarded as a high electric field strength position, and positions other than the high electric field strength position are low electric field strength positions.

[0051] Furthermore, a plurality of first groups 221 arranged along the forward direction are provided on the receiving plane, and the first group 221 includes a plurality of first recesses 22 or a plurality of first protrusions arranged at intervals along the width direction, and the first recesses 22 or first protrusions in two adjacent first groups 221 are alternately staggered in the width direction.

[0052] The first depressions 22 or first protrusions in the adjacent first groups 221 are alternately staggered in the width direction. Taking the first depression 22 as an example, the first depression 22 located at the front side of the advancing direction is staggered with the first depression 22 located at the rear side of the advancing direction, so that the jet of the nozzle 311 located at the front side will deviate toward the first depression 22 located at the front side, and break away from the attraction of the deposited fibers formed by the first depression 22 located at the rear side, so that the later deposited fibers are staggered with the deposited fibers, thereby improving the uniformity of the deposition distribution of the fibers on the substrate 4. Figure 1and Figure 4 , Figure 1 is the fiber deposition situation of the prior art. The jet formed by the front nozzle 12 is attracted and deflected by the deposited fibers of the rear nozzle 11. Referring to the schematic diagram of the jet deposition distribution on the receiving device 14 and the substrate 15 below, it causes obvious vacancies 13 to still appear in the area below the front nozzle 12 of the substrate 15, and still makes the fiber deposition uneven.

[0053] After adopting this solution, the fiber deposition effect is as Figure 4 , the jet formed by the nozzle 311 on the front side in the advancing direction can break away from the attraction of the deposited fibers formed by the nozzle 311 on the rear side in the advancing direction, so as to form a deposition area between two deposited areas, that is, reduce the occurrence of Figure 1 the vacancy 13 in, improve the overall uniformity of fiber deposition, and reduce the occurrence of streaks.

[0054] Furthermore, multiple first depressions 22 or first protrusions are evenly arranged in the width direction. Taking the first depression 22 as an example, in the width direction, the first depression 22 in the first group 221 on the front side is arranged in the middle of two adjacent first depressions 22 in the first group 221 on the rear side. The width of the first depression 22 in the length direction is D, and the distance between the centers of two adjacent first depressions 22 in the first group 221 is S, where D < S < 2D. The arrangement of the first protrusions is also like this. In this way, multiple first depressions 22 are evenly arranged in the width direction, and the first depression 22 is in the exact middle of two first depressions 22 in the front or rear side and has partial overlap, so as to avoid obvious streak situations and make the fiber deposition more uniform.

[0055] Example 1:

[0056] The receiving device 2 includes a fixed receiving plate 21. The receiving plate 21 is set to be conductive, and a receiving plane is arranged on the receiving plate 21. When the substrate 4 advances, it moves relative to the receiving plate 21.

[0057] The position of the fixed receiving plate 21, that is, the high electric field strength position and the low electric field strength position, is fixed relative to the nozzle assembly 31. The deposited fibers attracted by a high electric field strength position on the substrate 4 basically form a range in the width direction in a fixed manner. Multiple high electric field strength positions arranged staggered in the width direction can form multiple basically fixed and staggered deposition ranges, making the overall distribution of the fibers of the substrate 4 more uniform in the width direction.

[0058] Example 2:

[0059] The receiving device 2 includes a conveyor belt, and the side of the conveyor belt close to the substrate 4 is a receiving plane, and the linear speed of the conveyor belt is different from the conveying speed of the substrate 4. The conveyor belt can be conductive or insulating. When an insulating conveyor belt is used, a conductive plate can be set on the lower side of the conveyor belt. The conductive plate and the nozzle assembly 31 form a spinning electric field, and the electric field strength difference can also be formed on the concave and convex structure of the insulating conveyor belt. Preferably, the rotation speed of the conveyor belt is slower than the conveying speed of the substrate 4.

[0060] When the conveyor belt rotates, the position of the high electric field strength point on the conveyor belt corresponding to the nozzle 311 will change, that is, the direction of the attraction exerted on the jet will change, the deposition direction will change, and the conveyor belt and the substrate 4 will produce relative movement. The position of the jet deposited on the substrate 4 will change in the width direction, so that the position of the jet deposited on the substrate 4 changes, which can break away from the attraction of the deposited fibers and improve the uniformity of the overall deposition of the substrate 4.

[0061] In some specific embodiments, referring to Figures 5 to 7 The receiving device 2 includes a plurality of conductive conveying rollers 23, which are rotatably connected to a base 26. The plurality of conductive conveying rollers 23 are arranged in sequence along the forward direction, and a concave-convex structure is provided on the outer surface of the conductive conveying roller 23. The conductive conveying roller 23 rotates during the forward movement of the substrate 4.

[0062] During the process of substrate 4 advancing, the conductive conveying roller 23 rotates, and the surface height of the concave-convex structure on the conductive conveying roller 23 near the substrate 4 keeps changing, that is, the position of the high electric field strength position keeps changing, so that the position of the high electric field strength position in the corresponding range of the jet emitted by the nozzle 311 keeps changing, that is, the direction of the attraction of the jet changes, and the deposition direction changes, so that the position of the jet deposited on the substrate 4 changes in the width direction, which can break away from the attraction of the deposited fibers and improve the uniformity of the overall deposition of the substrate 4. The conductive conveying roller 23 can be driven by the substrate 4 to rotate passively by contact with the substrate 4, or it can be actively rotated by connecting a driving motor (not shown in the drawings). The rotation speed of different conductive conveying rollers 23 can be obtained by actively rotating the driving motor, and the rotation speeds of different conductive conveying rollers 23 can also be different, so that the deposition uniformity can be controlled more flexibly and the deposition effect can be adjusted.

[0063] Embodiment three:

[0064] Reference Figure 5A plurality of second depressions 24 are provided on the outer surface of the conductive conveying roller 23, and the high electric field strength position is located at the edge of the second depression 24, and the inside of the second depression 24 and the surface between the second depression 24 are low and high electric field strength positions. The plurality of second depressions 24 are arranged alternately along the outer surface of the conductive conveying roller 23. When the substrate 4 moves forward through the conductive conveying roller 23, the plurality of second depressions 24 on the rotating conductive conveying roller 23 form alternating high electric field strength positions and low electric field strength positions.

[0065] Alternatively, a plurality of second protrusions are provided on the outer surface of the conductive conveying roller 23, the high electric field strength position is located at the protruding top of the second protrusion, and other positions lower than the protruding top of the second protrusion are low and high electric field strength positions. The plurality of second protrusions are arranged alternately along the outer surface of the conductive conveying roller 23. When the substrate 4 moves forward through the conductive conveying roller 23, the plurality of second protrusions on the rotating conductive conveying roller 23 form alternating high electric field strength positions and low electric field strength positions.

[0066] Under the effect of the edge effect in the electric field, the charges are easily gathered at the edge of the second depression 24 or the protruding top of the second protrusion, so that the electric field strength is relatively high, and the positions other than the high electric field strength positions are low electric field strength positions. When the conductive conveying roller 23 is passively rotated, the multiple high electric field strength positions in the multiple conductive conveying rollers 23 can be staggered in the width direction.

[0067] Embodiment 4:

[0068] Reference Figure 6 The outer surface of the conductive conveying roller 23 is provided with an external thread 25, and the tooth top of the external thread 25 close to the substrate 4 is a position with high electric field strength.

[0069] The tooth top of the external thread 25 close to the substrate 4 is a high electric field strength position, and other positions such as the groove and the root of the thread are low electric field strength positions. The tooth top of the external thread 25 is roughly in point contact with the substrate 4. During the advancement of the substrate 4, the contact point between the external thread 25 and the substrate 4 moves continuously in the width direction as the conductive conveying roller 23 rotates, that is, the high electric field strength position moves continuously in the width direction, which can attract the jet to deposit at a variable position in the width direction of the substrate 4. There are multiple contact points on the external thread 25 with the substrate 4, and multiple high electric field strength positions attract the jet in turn, so that the fiber can be deposited more evenly on the substrate 4.

[0070] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for fiber deposition with improved uniformity, characterized in that: include: A spinning electric field is applied between the receiving device (2) and the nozzle device (3), wherein the nozzle device (3) comprises a plurality of nozzle assemblies (31) arranged in sequence along the advancing direction of the substrate (4), each of the nozzle assemblies (31) comprises a plurality of nozzles (311) arranged in sequence and spaced apart along the width direction of the substrate (4), and the jets formed by the nozzles (311) are deposited on the substrate (4) on the receiving device (2); The receiving device (2) is provided with a concave-convex structure, and under the action of the spinning electric field, the receiving device (2) forms an electric field strength difference on the concave-convex structure, so that a high electric field strength position with a relatively high electric field strength and a low electric field strength position with a relatively low electric field strength are formed on the receiving device (2), and a plurality of the high electric field strength positions and a plurality of the low electric field strength positions are arranged alternately in the forward direction and the width direction; The substrate (4) moves along the forward direction on the receiving device (2) and passes through the alternating high electric field strength position and the low electric field strength position. The high electric field strength position generates an attractive force on the jet located above, so that the jet in the air moves toward the corresponding high electric field strength position and is deposited on the moving substrate (4).

2. The fiber deposition method for improving uniformity according to claim 1, characterized in that: The receiving device (2) is provided with a receiving plane in contact with the substrate (4), and the concave-convex structure is provided on the receiving plane.

3. The fiber deposition method for improving uniformity according to claim 2, characterized in that: The concavo-convex structure comprises a plurality of first concavities (22) arranged in a staggered manner, and the high electric field strength is located at the edge of the first concavity (22); Alternatively, the concave-convex structure includes a plurality of first protrusions arranged in a staggered manner, and the high electric field strength is located at the protruding tops of the first protrusions.

4. The fiber deposition method for improving uniformity according to claim 3, characterized in that: The receiving plane is provided with a plurality of first groups (221) arranged along the advancing direction, the first groups (221) comprising a plurality of first recesses (22) or a plurality of first protrusions arranged at intervals along the width direction, and the first recesses (22) or the first protrusions in two adjacent first groups (221) are alternately staggered in the width direction.

5. The fiber deposition method for improving uniformity according to claim 2, characterized in that: The receiving device (2) comprises a fixed receiving plate (21), and the receiving plane is arranged on the receiving plate (21).

6. The fiber deposition method for improving uniformity according to claim 2, wherein: The receiving device (2) comprises a conveyor belt, the side of the conveyor belt close to the substrate (4) is the receiving plane, and the linear speed of the conveyor belt is different from the conveying speed of the substrate (4).

7. The fiber deposition method for improving uniformity according to claim 1, characterized in that: The receiving device (2) comprises a plurality of conductive conveying rollers (23), wherein the plurality of conductive conveying rollers (23) are arranged in sequence along the advancing direction, the concave-convex structure is arranged on the outer surface of the conductive conveying roller (23), and the conductive conveying roller (23) rotates during the advancing process of the substrate (4).

8. The fiber deposition method for improving uniformity according to claim 7, characterized in that: A plurality of second depressions (24) are provided on the outer surface of the conductive conveying roller (23), the high electric field strength position is located at the edge of the second depression (24), and the plurality of second depressions (24) are arranged in a staggered manner along the outer surface of the conductive conveying roller (23), and when the substrate (4) moves forward and passes through the conductive conveying roller (23), the plurality of second depressions (24) on the rotating conductive conveying roller (23) form the high electric field strength position and the low electric field strength position that change alternately; Alternatively, a plurality of second protrusions are provided on the outer surface of the conductive conveying roller (23), the high electric field strength position is located at the protruding top of the second protrusion, and the plurality of second protrusions are arranged in a staggered manner along the outer surface of the conductive conveying roller (23); when the substrate (4) moves forward and passes through the conductive conveying roller (23), the plurality of second protrusions on the rotating conductive conveying roller (23) form the high electric field strength position and the low electric field strength position that change alternately.

9. The fiber deposition method for improving uniformity according to claim 7, characterized in that: The outer surface of the conductive transmission roller (23) is provided with an external thread (25), and the crest of the external thread (25) close to the substrate (4) is the position of high electric field strength.

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