Aramid fiber sizing device and sizing method

Abstract

The invention relates to the technical field of fiber sizing treatment, and discloses an aramid fiber sizing device and method.The aramid fiber sizing device comprises a yarn unwinding device, a sizing tank, a yarn spreading and drying device and a winding device, the yarn spreading and drying device comprises a primary yarn spreading assembly, a drying roller and a secondary yarn spreading assembly, and the yarn spreading assembly comprises a first vibration roller, a conveying roller and a second vibration roller; the vibrating roller vibrates in the direction perpendicular to the fiber conveying direction. After being unreeled, fibers are sized through the sizing tank and fed into the yarn spreading and drying device to be subjected to wet broadening, mechanical damage to fiber bundles is reduced, and broken filaments are reduced. During primary yarn spreading, the vibrating roller vibrates at high frequency to enable fiber bundles to be dispersed and widened under the action of transverse friction force, extrusion mechanical damage of the fiber bundles is reduced, broken filaments are reduced, redundant size is removed, drying is facilitated, and adhesion between monofilaments is reduced. During secondary yarn spreading, fiber bundling force applied by surface tension of slurry does not need to be overcome, secondary spreading of fiber bundles is achieved under high-frequency vibration of the vibrating roller, and good monofilament dispersity is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of fiber sizing treatment, and in particular to an aramid fiber sizing device and a sizing method. Background Art

[0002] Aramid fiber is a high-performance organic fiber with a skin-core structure, a smooth surface and high chemical inertness. When aramid fiber is compounded with a resin matrix, it is easy to form interface defects, which limits its application in the field of reinforced resin-based composite materials.

[0003] In order to improve the interfacial interaction between aramid fiber and resin matrix, sizing treatment is usually used to modify the surface of aramid fiber. However, during the sizing process, aramid fiber is easily affected by the surface tension of the slurry, causing the fiber to re-aggregate into bundles, and the adjacent fibers to adhere to each other, resulting in serious fiber adhesion problems.

[0004] In order to solve the problem of fiber adhesion, a multi-group yarn spreading roller extrusion method is currently used. By adjusting the gap between the rollers, the fiber bundles with slurry on the surface are squeezed to resist the tension contraction of the slurry, thereby achieving uniform widening of the fiber bundles.

[0005] However, the applicant has found that in the process of using the yarn spreading roller to extrude the aramid fiber to widen, there are at least the following problems:

[0006] Compared with inorganic fibers such as carbon fiber, basalt fiber, and glass fiber, aramid fiber, which belongs to organic fiber, is more flexible. After sizing, the fiber bundle shrinks more obviously due to surface tension, which makes it difficult to use the yarn spreading roller to widen the fiber, resulting in a large adhesion problem for aramid fiber after sizing. In addition, the modulus of aramid fiber is generally lower than that of carbon fiber, and the squeezing effect of the yarn spreading roller can easily damage the aramid fiber, resulting in the generation of filaments. Summary of the invention

[0007] The invention provides an aramid fiber sizing device and a sizing method, so as to solve or improve the problem in the related art that the aramid fiber has a large adhesion and is easy to produce hair after sizing.

[0008] In a first aspect, the present invention provides an aramid fiber sizing device, comprising a yarn unwinding device, a sizing trough, a yarn spreading and drying device, and a winding device, wherein the yarn unwinding device, the sizing trough, the yarn spreading and drying device, and the winding device are sequentially arranged along the conveying direction of the fiber bundle;

[0009] The yarn spreading and drying device comprises a primary yarn spreading assembly, a drying roller and a secondary yarn spreading assembly, and the primary yarn spreading assembly, the drying roller and the secondary yarn spreading assembly are arranged in sequence along the conveying direction of the fiber bundle;

[0010] The primary yarn spreading assembly and the secondary yarn spreading assembly both include a first vibrating roller, a conveying roller and a second vibrating roller, and the first vibrating roller, the conveying roller and the second vibrating roller are sequentially arranged along the conveying direction of the fiber bundle; the first vibrating roller and the second vibrating roller vibrate along a first direction, and the first direction is perpendicular to the conveying direction of the fiber bundle; when the fiber bundle is conveyed, the conveying roller is fixed and does not rotate.

[0011] In an optional embodiment, the first vibrating roller, the conveying roller and the second vibrating roller can all be movably arranged, and the first vibrating roller, the conveying roller and the second vibrating roller can all be moved along the height direction of the yarn spreading and drying device.

[0012] In an optional embodiment, the yarn spreading and drying device further comprises:

[0013] A plurality of guide grooves extend along the height direction of the yarn spreading and drying device, and the plurality of guide grooves are respectively arranged corresponding to the first vibrating roller, the conveying roller and the second vibrating roller, and the first vibrating roller, the conveying roller and the second vibrating roller respectively move along the corresponding guide grooves.

[0014] In an optional embodiment, the primary yarn spreading assembly and the secondary yarn spreading assembly are symmetrically arranged on both sides of the drying roller.

[0015] In an optional embodiment, the distance between the primary yarn spreading assembly and the secondary yarn spreading assembly is equal to the diameter of the drying roller.

[0016] In an optional embodiment, the first vibration roller and the second vibration roller are symmetrically arranged on both sides of the conveying roller, and the central axes of the first vibration roller and the second vibration roller are located at the same height position, and the conveying roller is located below the first vibration roller and the second vibration roller.

[0017] In an optional implementation, the distance between the first vibrating roller and the second vibrating roller is equal to the diameter of the conveying roller.

[0018] In an optional embodiment, in the primary yarn spreading assembly, the first vibrating roller, the conveying roller and the second vibrating roller are all made of hard materials;

[0019] In the secondary yarn spreading assembly, the first vibrating roller, the conveying roller and the second vibrating roller are all made of soft materials.

[0020] In an optional embodiment, the radii of the first vibrating roller, the conveying roller and the second vibrating roller are all smaller than the radius of the drying roller.

[0021] In a second aspect, the present invention further provides an aramid fiber sizing method, based on the aramid fiber sizing device as described in any one of the above items, comprising:

[0022] After the fiber bundle is released from the yarn release device, it is sent to the sizing tank for sizing treatment;

[0023] The fiber bundle with the slurry on the surface is sent to the yarn spreading and drying device, and first passes through the primary yarn spreading assembly, and the fiber bundle is once widened under the reciprocating high-frequency vibration of the first vibration roller and the second vibration roller, and the excess slurry is removed; then passes through the drying roller to dry the widened fiber bundle; then passes through the secondary yarn spreading assembly, and the dried fiber bundle is secondarily widened under the reciprocating high-frequency vibration of the first vibration roller and the second vibration roller;

[0024] The fiber bundle passing through the yarn spreading and drying device is sent to the winding device for winding.

[0025] The aramid fiber sizing device provided by the present invention is used for sizing the fiber bundle released from the yarn unwinding device through the sizing tank, and then entering the yarn spreading and drying device for wet spreading. The sizing liquid can act as a lubricant to reduce the mechanical damage of the fiber bundle during the spreading process and reduce the generation of fuzz. During the first yarn spreading process, the vibrating roller performs reciprocating high-frequency vibration in the direction perpendicular to the routing direction of the fiber bundle, so that the fiber bundle is dispersed and spread under the action of the lateral friction force, reducing the mechanical damage of the fiber bundle by extrusion, reducing the formation of fiber fuzz, and the high-frequency vibration can remove excess sizing liquid, which is beneficial for the drying roller to dry and reduce the adhesion between the monofilaments. During the second yarn spreading process, there is no need to overcome the fiber bundling force exerted by the surface tension when the sizing liquid evaporates, and the fiber bundle can be further spread under the reciprocating high-frequency vibration of the vibrating roller, thereby effectively ensuring the good dispersion of the monofilaments and the fiber opening of the finished fiber, which lays a good foundation for the subsequent compounding with the resin matrix. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is a structural schematic diagram of an aramid fiber sizing device according to an embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram of a yarn spreading and drying device according to an embodiment of the present invention;

[0029] Figure 3This is a schematic structural diagram of the yarn spreading assembly in the first position according to an embodiment of the present invention;

[0030] Figure 4 This is a schematic structural diagram of the yarn spreading assembly in the second position according to an embodiment of the present invention;

[0031] Figure 5 is a schematic structural diagram of a yarn spreading assembly in a third position according to an embodiment of the present invention;

[0032] Figure 6 It is a schematic structural diagram of the vibration roller of an embodiment of the present invention when spreading yarn under the action of high-frequency vibration.

[0033] Description of reference numerals:

[0034] 1. Yarn unwinding device; 101. Tension yarn unwinding frame; 2. Sizing trough; 201. Sizing liquid; 202. Guide roller; 3. Yarn spreading and drying device; 301. Primary yarn spreading assembly; 302. Drying roller; 303. Secondary yarn spreading assembly; 311. First vibration roller; 312. Conveying roller; 313. Second vibration roller; 314. Guide trough; 4. Winding device; 5. Fiber bundle. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] Combine the following Figures 1 to 6 , describing the aramid fiber sizing device and sizing method of an embodiment of the present invention.

[0040] According to an embodiment of the present invention, on the one hand, an aramid fiber sizing device is provided, which is suitable for sizing aramid fibers. Specifically, Figure 1 As shown, the aramid fiber sizing device includes a yarn laying device 1, a sizing tank 2, a yarn spreading and drying device 3 and a winding device 4. And along the conveying direction of the fiber bundle 5, that is, Figure 1 In the direction indicated by the unidirectional arrow, the yarn unwinding device 1, the sizing tank 2, the yarn spreading and drying device 3 and the winding device 4 are arranged in sequence. Specifically, the yarn unwinding device 1, the sizing tank 2 and the winding device 4 can adopt common devices in the relevant technology. For example, the yarn unwinding device 1 adopts a tension yarn unwinding frame 101 to unwind the fiber bundle 5. The pre-prepared sizing liquid 201 is injected into the sizing tank 2, and a guide roller 202 is provided at the bottom of the sizing tank 2 to guide the fiber bundle 5 so that the fiber bundle 5 can be fully in contact with the sizing liquid 201. The winding device 4 adopts a winding roller to wind up the fiber bundle 5.

[0041] In this embodiment, if Figure 2 As shown, the yarn spreading and drying device 3 includes a primary yarn spreading assembly 301, a drying roller 302 and a secondary yarn spreading assembly 303. And along the conveying direction of the fiber bundle 5, that is, Figure 2In the direction indicated by the middle arrow, the primary yarn spreading assembly 301, the drying roller 302 and the secondary yarn spreading assembly 303 are sequentially arranged. Specifically, the drying roller 302 can adopt common devices in the relevant technology, for example, an electric heating drying roller, an infrared heating drying roller, etc., to dry the fiber bundle 5 after the primary widening, so that the fiber bundle 5 can be quickly dried in the widened state, the adhesion between the monofilaments is reduced, and the problem of fiber re-coiling due to the volatilization of the slurry between the traditional yarn spreading device and the drying device is eliminated.

[0042] Furthermore, if Figure 2 As shown, the primary yarn spreading assembly 301 and the secondary yarn spreading assembly 303 both include a first vibrating roller 311, a conveying roller 312 and a second vibrating roller 313. And along the conveying direction of the fiber bundle 5, that is, Figure 2 In the direction indicated by the middle arrow, the first vibration roller 311, the conveying roller 312 and the second vibration roller 313 are arranged in sequence. At the same time, the first vibration roller 311 and the second vibration roller 313 vibrate along the first direction, which is perpendicular to the conveying direction of the fiber bundle 5. And during the conveying process of the fiber bundle 5, the conveying roller 312 is fixed and does not rotate.

[0043] Taking the first vibration roller 311 as an example, Figure 6 As shown, the first vibration roller 311 vibrates along the first direction. Figure 6 The direction indicated by the double-headed arrow is the same as the conveying direction of the fiber bundle 5. Figure 6 In this way, the first vibration roller 311 and the second vibration roller 313 perform reciprocating high-frequency vibration in a direction perpendicular to the conveying direction of the fiber bundle 5, so that the fiber bundle 5 is dispersed under the action of the lateral friction force to achieve the effect of widening. In addition, during the conveying process of the fiber bundle 5, the conveying roller 312 is fixed and does not rotate, which can increase the friction between the fiber bundle 5 and the conveying roller 312 and improve the yarn spreading effect.

[0044] With such arrangement, the fiber bundle 5 released from the yarn release device 1 is sized in the sizing tank 2 and then enters the yarn spreading and drying device 3 for wet spreading. The sizing liquid 201 can act as a lubricant to reduce the mechanical damage of the fiber bundle 5 during the spreading process and reduce the generation of filaments. During a yarn spreading process, the first vibration roller 311 and the second vibration roller 313 perform reciprocating high-frequency vibrations in a direction perpendicular to the routing direction of the fiber bundle 5, so that the fiber bundle 5 is dispersed and spread under the action of the lateral friction force, reducing the mechanical damage of the fiber bundle 5 by squeezing, reducing the formation of fiber filaments, and the high-frequency vibration can remove excess sizing liquid 201, which is beneficial for the drying roller 302 to perform rapid drying and reduce the adhesion between the monofilaments. During the secondary yarn spreading process, more than 95% of the moisture in the fiber bundles has been removed after drying, and there is no need to overcome the fiber bundling force exerted by the surface tension when the slurry evaporates. Under the reciprocating high-frequency vibration of the first vibration roller 311 and the second vibration roller 313, the fiber bundle 5 can be further widened, thereby effectively ensuring good dispersion of the single filaments and ensuring the fiber opening of the finished fiber, laying a good foundation for the subsequent composite with the resin matrix.

[0045] In some embodiments of the present invention, Figure 1 As shown, the first vibrating roller 311, the conveying roller 312 and the second vibrating roller 313 can be movably arranged, and the first vibrating roller 311, the conveying roller 312 and the second vibrating roller 313 can all move along the height direction of the yarn spreading and drying device 3, that is, along Figure 1 The first vibration roller 311, the conveying roller 312 and the second vibration roller 313 can move up and down in the direction indicated by the double-headed arrow. Specifically, the first vibration roller 311, the conveying roller 312 and the second vibration roller 313 can be driven by a lifting mechanism to realize the up and down movement of each roller. Optionally, the lifting mechanism includes a hydraulic lift and a fixed bracket. Taking the first vibration roller 311 as an example, the first vibration roller 311 is installed on the fixed bracket, and the driving end of the hydraulic lift is connected to the fixed bracket to drive the fixed bracket to move up and down, thereby driving the first vibration roller 311 to move up and down. The setting form of the conveying roller 312 and the second vibration roller 313 can refer to the above-mentioned structural design to realize the up and down movement of the conveying roller 312 and the second vibration roller 313.

[0046] Alternatively, if Figure 3 As shown, the first vibration roller 311, the conveying roller 312 and the second vibration roller 313 are arranged in a first position state.

[0047] like Figure 4 As shown, the first vibrating roller 311, the conveying roller 312 and the second vibrating roller 313 are arranged in the second position. In the second position, the first vibrating roller 311 and the second vibrating roller 313 move downward, and the conveying roller 312 moves upward, so that the first vibrating roller 311, the conveying roller 312 and the second vibrating roller 313 are close to each other, and the length of the fiber bundle 5 is shortened compared to the first position.

[0048] like Figure 5 As shown, the first vibrating roller 311, the conveying roller 312 and the second vibrating roller 313 are arranged in the third position. In the third position, the first vibrating roller 311 and the second vibrating roller 313 move upward, and the conveying roller 312 moves downward, so that the first vibrating roller 311, the conveying roller 312 and the second vibrating roller 313 are separated from each other, and the length of the fiber bundle 5 routing path becomes longer compared to the first position.

[0049] By configuring in this way, by adjusting the height positions of the first vibration roller 311, the conveying roller 312 and the second vibration roller 313 up and down, the distance between the vibration roller and the conveying roller 312 is changed, thereby changing the conveying length of the fiber bundle 5, thereby achieving the purpose of adjusting the widening effect of the fiber bundle 5 to meet different application requirements.

[0050] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the yarn spreading and drying device 3 further includes a plurality of guide grooves 314, and the plurality of guide grooves 314 all extend along the height direction of the yarn spreading and drying device 3. The plurality of guide grooves 314 are respectively arranged corresponding to the first vibrating roller 311, the conveying roller 312, and the second vibrating roller 313, and the first vibrating roller 311, the conveying roller 312, and the second vibrating roller 313 move along the corresponding guide grooves 314. It should be noted that the lengths of the plurality of guide grooves 314 depend on the movement displacements of the corresponding first vibrating roller 311, the conveying roller 312, and the second vibrating roller 313.

[0051] By configuring in this way, by arranging a plurality of guide grooves 314, it can be ensured that the first vibrating roller 311, the conveying roller 312 and the second vibrating roller 313 have a clear path and direction during movement, thereby enhancing the movement stability and positioning accuracy of the entire yarn spreading and drying device 3, helping to ensure the widening effect of the yarn and improving work efficiency.

[0052] In some embodiments of the present invention, Figure 2 As shown, the primary yarn spreading assembly 301 and the secondary yarn spreading assembly 303 are symmetrically arranged on both sides of the drying roller 302. In this way, the overall structure is symmetrically arranged, which can make the yarn spreading and drying device 3 more compact and more reasonably laid out, and help the yarn to maintain uniform heating and drying effects during the drying process, thereby avoiding the problem of local over-drying or insufficient drying.

[0053] Further, in some embodiments of the present invention, see Figure 1 and Figure 2As shown, the distance L1 between the primary yarn spreading assembly 301 and the secondary yarn spreading assembly 303 is equal to the diameter of the drying roller 302. With such an arrangement, the direction of the fiber bundle 5 between the primary yarn spreading assembly 301 and the drying roller 302, and the direction of the fiber bundle 5 between the drying roller 302 and the secondary yarn spreading assembly 303 are both kept in a vertical direction, thereby increasing the contact area between the fiber bundle 5 and the second vibration roller 313, the drying roller 302 and the first vibration roller 311, so that the fiber bundle 5 is fully spread and dried, which is conducive to improving the yarn widening effect.

[0054] In some embodiments of the present invention, Figure 1 As shown, the first vibration roller 311 and the second vibration roller 313 are symmetrically arranged on both sides of the conveying roller 312, and the central axes of the first vibration roller 311 and the second vibration roller 313 are located at the same height position, and the conveying roller 312 is located below the first vibration roller 311 and the second vibration roller 313. Figure 1 As shown, the first vibration roller 311 and the second vibration roller 313 are located at the same horizontal height, and the first vibration roller 311, the conveying roller 312 and the second vibration roller 313 are distributed in a V shape as a whole to form a primary yarn spreading assembly 301 and a secondary yarn spreading assembly 303 respectively.

[0055] With this arrangement, the yarn spreading components on both sides are reasonably arranged and compactly structured, which is beneficial to enhancing the overall structural stability of the yarn spreading components, effectively utilizing the vertical space, and ensuring that the fiber bundle 5 is evenly stressed on both sides of the conveying roller 312, thereby avoiding affecting the widening effect due to uneven stress.

[0056] Further, in some embodiments of the present invention, Figure 1 As shown, the distance L2 between the first vibration roller 311 and the second vibration roller 313 is equal to the diameter of the conveying roller 312. With such an arrangement, the direction of the fiber bundle 5 between the first vibration roller 311 and the conveying roller 312, and the direction of the fiber bundle 5 between the conveying roller 312 and the second vibration roller 313 are both kept in a vertical direction, thereby increasing the contact area between the fiber bundle 5 and the first vibration roller 311, the conveying roller 312 and the second vibration roller 313, so that the fiber bundle 5 is fully spread, which helps to improve the yarn widening effect.

[0057] In some embodiments of the present invention, in the primary yarn spreading assembly 301, the first vibration roller 311, the conveying roller 312 and the second vibration roller 313 are all made of hard materials. Specifically, the first vibration roller 311, the conveying roller 312 and the second vibration roller 313 are all stainless steel rollers, for example, the surface roughness of the stainless steel roller is Ra=0.2μm.

[0058] In the secondary yarn spreading assembly 303, the first vibration roller 311, the conveying roller 312 and the second vibration roller 313 are all made of soft materials. Specifically, the first vibration roller 311, the conveying roller 312 and the second vibration roller 313 are all polyurethane rollers, for example, the surface roughness of the polyurethane roller is Ra=0.1μm.

[0059] With such an arrangement, during a yarn spreading process, since the surface of the fiber bundle 5 is soaked with slurry as a lubricant, the friction between the fiber bundle 5 and the roller can be reduced, and the generation of fuzz during the sizing process can be reduced. Therefore, a roller made of hard material can be selected to widen the fiber bundle 5.

[0060] In the secondary yarn spreading process, since most of the moisture is removed from the fiber bundle 5 after being dried, rollers made of soft materials are required to widen the fiber bundle 5. Soft material rollers can reduce fiber damage during dry yarn spreading and reduce the generation of lint, which is beneficial to the quality of the finished fiber.

[0061] In addition, in this embodiment, the drying roller 302 can be a stainless steel roller, for example, its surface roughness is Ra = 0.05μm, which can prevent the slurry from remaining on the roller surface and extend its service life. It should be noted that the material and surface roughness value of the first vibration roller 311, the conveying roller 312, the second vibration roller 313 and the drying roller 302 can be specifically determined according to actual design requirements, which is only an example and is not specifically limited.

[0062] In some embodiments of the present invention, the radius of the first vibration roller 311, the conveying roller 312, and the second vibration roller 313 are all smaller than the radius of the drying roller 302. Optionally, the radius of the first vibration roller 311, the conveying roller 312, and the second vibration roller 313 are all consistent, for example, 5 cm to 10 cm. The radius of the drying roller 302 is twice the radius of the first vibration roller 311, the conveying roller 312, and the second vibration roller 313.

[0063] Such an arrangement can ensure that the fiber bundle 5 with the slurry can be fully dried when passing through the drying roller 302, so that the moisture content of the fiber bundle 5 is controlled below 5%, and the secondary yarn spreading effect of the fiber bundle 5 is fully ensured. It should be noted that the radius sizes of the first vibrating roller 311, the conveying roller 312, the second vibrating roller 313 and the drying roller 302 can be specifically determined according to actual design requirements, which is only an example description here, and no specific limitation is made.

[0064] According to an embodiment of the present invention, on the other hand, a method for sizing aramid fibers is provided. Based on the aramid fiber sizing devices in the above embodiments, see Figure 1 As shown, the aramid fiber sizing method comprises the following steps:

[0065] After the fiber bundle 5 is released from the yarn release device 1, it is sent to the sizing tank 2 to perform sizing treatment on the fiber bundle 5;

[0066] The fiber bundle 5 with the slurry on the surface is sent to the yarn spreading and drying device 3, and first passes through the primary yarn spreading assembly 301, and the fiber bundle 5 is once widened under the reciprocating high-frequency vibration of the first vibration roller 311 and the second vibration roller 313, and the excess slurry is removed; then passes through the drying roller 302, and the widened fiber bundle 5 is dried; then passes through the secondary yarn spreading assembly 303, and the dried fiber bundle 5 is secondarily widened under the reciprocating high-frequency vibration of the first vibration roller 311 and the second vibration roller 313;

[0067] The fiber bundle 5 that has passed through the yarn spreading and drying device 3 is sent to the winding device 4 for winding.

[0068] Specifically, Figure 1 As shown, the yarn unwinding device 1 performs stable unwinding, for example, the fiber bundle 5 travels at a constant linear speed of 0 to 5 m / min.

[0069] When passing through the yarn spreading and drying device 3, the first vibration roller 311 and the second vibration roller 313 in the primary yarn spreading assembly 301 and the secondary yarn spreading assembly 303 perform reciprocating high-frequency vibration. In the primary yarn spreading, the vibration frequency of the roller is 400 times / minute to 650 times / minute, and the reciprocating amplitude is 0.5mm to 2.0mm. In the secondary yarn spreading, the vibration frequency of the roller is 350 times / minute to 500 times / minute, and the reciprocating amplitude is 0.5mm to 2.0mm. The drying roller 302 can be an electrically heated drying roller, and the temperature of the electrically heated drying roller is 120℃ to 280℃. In addition, the vibration rollers and conveying rollers of the primary yarn spreading assembly 301 and the secondary yarn spreading assembly 303 are made of different materials to adapt to different yarn spreading stages.

[0070] In this way, Figure 2 and Figure 6 As shown, the first vibration roller 311 and the second vibration roller 313 linearly extend and reciprocate at high frequency in the conveying direction perpendicular to the fiber bundle 5, so that the fiber bundle 5 is dispersed and widened under the action of the lateral friction force, reducing the extrusion mechanical damage of the fiber bundle 5 and reducing the formation of fiber filaments.

[0071] Moreover, during a yarn spreading process, when the fiber bundle 5 is wet-widened with the slurry on the telescopic reciprocating high-frequency vibration roller, the slurry 201 can act as a lubricant to further reduce the mechanical damage of the fiber bundle 5 during the widening process. High-frequency vibration can also remove excess slurry and eliminate the damage to the fiber caused by the traditional scraping roller. On the other hand, the telescopic reciprocating high-frequency vibration roller can also overcome the bundling force applied to the fiber bundle by the surface tension of the slurry, solve the problem of the adhesion of the fiber monofilaments after the slurry is impregnated due to the surface tension of the slurry, and achieve the widening of the fiber bundle.

[0072] In addition, the use of electrically heated drying rollers for drying enables the fiber bundle 5 to be dried quickly in a widened state, reduces adhesion between the monofilaments, and eliminates the problem of fiber re-coiling due to volatilization of the slurry between the traditional yarn spreading device and the drying device.

[0073] During the secondary yarn spreading process, more than 95% of the moisture in the fiber bundle has been removed by the electrically heated drying roller, and there is no need to overcome the fiber bundling force exerted by the surface tension when the slurry evaporates. The fiber bundle 5 can then be secondary widened by the telescopic reciprocating high-frequency vibration roller, laying a good foundation for the subsequent composite with the resin matrix.

[0074] With such arrangement, the fiber bundle 5 released from the yarn unwinding device 1 is sized by the sizing tank 2 and then enters the yarn spreading and drying device 3 for wet spreading. The sizing liquid 201 can act as a lubricant to reduce the mechanical damage of the fiber bundle 5 during the spreading process and reduce the generation of filaments. During the first yarn spreading process, the first vibration roller 311 and the second vibration roller 313 perform reciprocating high-frequency vibrations in a direction perpendicular to the routing direction of the fiber bundle 5, so that the fiber bundle 5 is dispersed and spread under the action of the lateral friction force, reducing the mechanical damage of the fiber bundle 5 by extrusion and the formation of fiber filaments. The high-frequency vibration can remove excess slurry, which is beneficial for the drying roller 302 to perform rapid drying and reduce the adhesion between the monofilaments. During the second yarn spreading process, more than 95% of the water in the fiber bundle after drying has been removed, and there is no need to overcome the fiber bundling force exerted by the surface tension when the slurry evaporates. Under the reciprocating high-frequency vibration of the first vibration roller 311 and the second vibration roller 313, the fiber bundle 5 can be further spread.

[0075] In summary, the aramid fiber obtained by the aramid fiber sizing method provided in this embodiment effectively ensures good monofilament dispersion and fiber opening of the finished fiber, laying a good foundation for subsequent compounding with the resin matrix. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the above-mentioned aramid fiber sizing device, so it will not be repeated here.

[0076] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A sizing device for aramid fibers, characterized in that: The invention comprises a yarn unwinding device (1), a sizing trough (2), a yarn unwinding and drying device (3) and a winding device (4), wherein the yarn unwinding device (1), the sizing trough (2), the yarn unwinding and drying device (3) and the winding device (4) are arranged in sequence along the conveying direction of the fiber bundle (5); The yarn spreading and drying device (3) comprises a primary yarn spreading assembly (301), a drying roller (302) and a secondary yarn spreading assembly (303), wherein the primary yarn spreading assembly (301), the drying roller (302) and the secondary yarn spreading assembly (303) are arranged in sequence along the conveying direction of the fiber bundle (5); The primary yarn spreading assembly (301) and the secondary yarn spreading assembly (303) both comprise a first vibrating roller (311), a conveying roller (312) and a second vibrating roller (313), wherein the first vibrating roller (311), the conveying roller (312) and the second vibrating roller (313) are arranged in sequence along the conveying direction of the fiber bundle (5); the first vibrating roller (311) and the second vibrating roller (313) vibrate along a first direction, wherein the first direction is perpendicular to the conveying direction of the fiber bundle (5); and when the fiber bundle (5) is conveyed, the conveying roller (312) is fixed and does not rotate.

2. The aramid fiber sizing device according to claim 1, characterized in that: The first vibrating roller (311), the conveying roller (312) and the second vibrating roller (313) can all be movably arranged, and the first vibrating roller (311), the conveying roller (312) and the second vibrating roller (313) can all be moved along the height direction of the yarn spreading and drying device (3).

3. The aramid fiber sizing device according to claim 2, characterized in that: The yarn spreading and drying device (3) further comprises: A plurality of guide grooves (314) extend along the height direction of the yarn spreading and drying device (3); the plurality of guide grooves (314) are respectively arranged corresponding to the first vibrating roller (311), the conveying roller (312) and the second vibrating roller (313); the first vibrating roller (311), the conveying roller (312) and the second vibrating roller (313) respectively move along the corresponding guide grooves (314).

4. The aramid fiber sizing device according to any one of claims 1 to 3, characterized in that: The primary yarn spreading assembly (301) and the secondary yarn spreading assembly (303) are symmetrically arranged on both sides of the drying roller (302).

5. The aramid fiber sizing device according to claim 4, characterized in that: The distance between the primary yarn spreading assembly (301) and the secondary yarn spreading assembly (303) is equal to the diameter of the drying roller (302).

6. The aramid fiber sizing device according to any one of claims 1 to 3, characterized in that: The first vibration roller (311) and the second vibration roller (313) are symmetrically arranged on both sides of the conveying roller (312), and the central axes of the first vibration roller (311) and the second vibration roller (313) are located at the same height position, and the conveying roller (312) is located below the first vibration roller (311) and the second vibration roller (313).

7. The aramid fiber sizing device according to claim 6, characterized in that: The distance between the first vibrating roller (311) and the second vibrating roller (313) is equal to the diameter of the conveying roller (312).

8. The aramid fiber sizing device according to any one of claims 1 to 3, characterized in that: In the primary yarn spreading assembly (301), the first vibrating roller (311), the conveying roller (312) and the second vibrating roller (313) are all made of hard materials; In the secondary yarn spreading assembly (303), the first vibrating roller (311), the conveying roller (312) and the second vibrating roller (313) are all made of soft materials.

9. The aramid fiber sizing device according to any one of claims 1 to 3, characterized in that: The radii of the first vibrating roller (311), the conveying roller (312) and the second vibrating roller (313) are all smaller than the radius of the drying roller (302).

10. A method for sizing aramid fibers, characterized in that: The aramid fiber sizing device according to any one of claims 1 to 9 comprises: After the fiber bundle (5) is released from the yarn release device (1), it is sent into the sizing tank (2) to perform sizing treatment on the fiber bundle (5); The fiber bundle (5) with the slurry on the surface is sent to the yarn spreading and drying device (3), and first passes through the primary yarn spreading assembly (301), and the fiber bundle (5) is once widened under the reciprocating high-frequency vibration of the first vibration roller (311) and the second vibration roller (313), and the excess slurry is removed; then passes through the drying roller (302), and the widened fiber bundle (5) is dried; then passes through the secondary yarn spreading assembly (303), and the dried fiber bundle (5) is secondarily widened under the reciprocating high-frequency vibration of the first vibration roller (311) and the second vibration roller (313); The fiber bundle (5) that has passed through the yarn spreading and drying device (3) is sent to the winding device (4) for winding.

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