CN113235176B - Drafting roller and spinning assembly for spinning - Google Patents

Abstract

The invention discloses a drafting roller for spinning and a spinning assembly. The drafting roller for spinning includes a plurality of arc-shaped end face rotating blades, and the plurality of arc-shaped end face rotating blades are distributed along the circumferential direction of the drafting roller; The arc-shaped end faces of several arc-shaped end-face rotor blades jointly constitute the outer side of the circumferential surface of the drafting roller. In the drafting roller of the present invention, its circumferential surface in contact with the tow is jointly formed by the arc-shaped end faces of several arc-shaped end face rotor blades, therefore, the tow is actually in contact with the arc-shaped end faces of the arc-shaped end face rotor blades, so that the present invention The drafting roller can adjust the number and area of the contact point between the tow and the roller or the number and area of the line, while realizing the drafting effect on the tow, it can greatly reduce the adhesion of the drafting roller to the floating yarn, monofilament or broken yarn It highlights the entrainment effect of the tow itself on wool, floating and broken yarns, thereby eliminating the adhesion of wool and broken yarns to the roller.

Description

A drafting roller and spinning assembly for spinning

technical field

The invention belongs to the technical field of spinning equipment, and in particular relates to a drafting roller for spinning and a spinning component.

Background technique

The drafting roll is a common device in the fiber preparation and spinning process, and it plays a very important role in the fiber forming process. In the process of wet spinning and fine-denier yarn drawing, the drawing roller often encounters the problem of fluff winding. In order to solve this problem and maintain stable production operation, the industry adopts various channels and methods to deal with it.

A method in the prior art to solve the problem of fluff entanglement in drafting rollers is: from the perspective of production process management, by improving the uniformity of raw materials, improving the accuracy of production control, or using oil agents, etc., to reduce tow interruptions The number of filaments, uneven filaments or increase the cohesion of the tow to reduce the adhesion and entanglement of the broken filaments on the roller surface. The disadvantage of this method is: the implementation cost of this method is very large, but it has little effect.

Another method in the prior art to solve the problem of fluff entanglement in the drafting roller is: the enterprise obtains a relatively stable production process and product quality by reducing the drafting ratio and increasing the fiber fineness. The disadvantage of this method is that the performance of the fiber in terms of fineness and mechanics is sacrificed.

Another method in the prior art to solve the problem of wool yarn entanglement in the drafting roller is: from the perspective of the drafting roller itself, by improving the smoothness, hardness, and wear resistance of the drafting roller to reduce the number of broken yarns on the rollers Surface adhesion and entanglement. The disadvantages of this method are: the cost of manufacturing, operation and maintenance is high, the effect of improvement is limited, and it cannot meet the requirements of further improving fiber performance and spinning finer fibers.

In short, the current existing technology does not have a significant and direct solution to the problem of yarn entanglement in the drafting roller, which greatly hinders the development and application of high mechanical properties, fine denier and ultra-fine denier fiber products in the industry , which limits the upgrading and differentiation of conventional products, and the development and application of high-performance products.

In view of this, the present invention is proposed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a drafting roller for spinning to eliminate the adhesion phenomenon of fluff and broken filaments to the drafting roller.

Another object of the present invention is to provide a spinning assembly, comprising the above-mentioned drafting roll for spinning.

In order to solve the problems of the technologies described above, the present invention adopts the basic idea of technical solution to be:

A drafting roller for spinning, comprising a plurality of arc-shaped end face rotor blades, the plurality of arc-shaped end face rotor blades are distributed along the circumferential direction of the draft roller at intervals;

The arc-shaped end faces of the plurality of arc-shaped end-face turning blades jointly constitute the outer side of the circumferential surface of the drafting roller.

Further, the structural parameters of the arc-shaped end face rotor blades include the end face radian, the end face arc chord length, the rotor blade length, the distance between rotor blade ends and the number of rotor blades, and the various structural parameters of the arc-shaped end face rotor blades are related to the arc shape The arrangement rules of the rotor blades on the end surface correspond to the spinning requirements.

Further, the curvature of the end surface of the arc-shaped end surface rotor blade is ≤300°.

Further, the distance between the two adjacent arc-shaped end face rotating blades is ≤ the radius of the drafting roller.

Further, the direction of the arc central axis of the arc-shaped end face rotor blades is parallel to the roller axis, and the arc-shaped end face rotor blades are distributed symmetrically or uniformly around the roller axis.

Further, there is an intersecting angle between the direction of the arc center axis of the arc-shaped end surface rotor blade and the roller axis direction of the drafting roller, and the intersection angle is ≤45°, and the arc-shaped end surface rotor blade is symmetrical or uniform around the roller axis distributed.

Further, the arc-shaped end face rotating blade includes a body and a coating covering the outside of the body;

The material of the body is metal, ceramic or composite material;

The material of the coating is composite functional material.

Further, the drafting roll for spinning is used in wet or dry-wet spinning process of regenerated cellulose fiber, seaweed fiber and chitosan fiber.

Further, the drafting roller for spinning is used in the drafting process of fine denier yarns and ultrafine denier yarns of regenerated cellulose fibers, nylon fibers, polyester fibers, polypropylene fibers, polyethylene fibers, etc.

Further, the drafting rolls for spinning are used alone, in combination, or in combination with other rolls.

A spinning assembly, comprising the above-mentioned drafting roll for spinning.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

In the drafting roller provided by the present invention, its circumferential surface in contact with the tow is jointly formed by the arc-shaped end surfaces of several arc-shaped end face rotor blades. The drafting roller of the present invention can greatly reduce the impact of the drafting roller on floating filaments, monofilaments or broken filaments while realizing the drafting effect on the filament bundle by regulating the number and area of contact points or lines between the filament bundle and the roller. Adhesive force highlights the entrainment effect of the tow itself on wool, floating and broken yarns, thereby eliminating the adhesion of wool and broken yarns to the roller. It can also eliminate the phenomenon of wool filament winding, improve production stability, and reduce labor; it can increase the drafting ratio of the process as much as possible, so that it can reach a higher draft level that could not be achieved due to a small amount of wool filament, thereby significantly improving the fiber quality. and mechanical properties of the tow.

The advantages of this drafting roller are more reflected in the stretching and refining process of fine denier and ultra-fine denier fibers, because as the fibers are further refined, they are more easily affected by the adhesion, friction, and microscopic forces on the surface of the drafting roller. Scraping and hanging wires are affected by the concave and convex parts, resulting in broken wires and roll wrapping, and slight broken wires and roll wrapping will significantly increase subsequent broken wires and roll wrapping, resulting in unstable or even interrupted production. However, the drafting roller adopting this design scheme can highlight the integrity and driveability of large and small tows, and significantly weaken the roller’s sticking, scraping and hanging effects, and even in the case of broken filaments, it is not easy to entangle the rollers. phenomenon, therefore, the drafting roller is more suitable for the stable production of fine and ultrafine denier fibers and tows, and makes it easy to further reduce the fineness and improve the comprehensive mechanical properties.

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Description of drawings

The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute improper limitations to the present invention. Apparently, the drawings in the following description are only some embodiments, and those skilled in the art can also obtain other drawings according to these drawings without creative efforts. In the attached picture:

Fig. 1 is a schematic structural diagram of a drafting roller provided by some embodiments of the present invention, d is the distance between adjacent arc-shaped end rotor vanes, and D is the diameter of the roller.

Fig. 2 is a schematic cross-sectional structure diagram of a drafting roller provided by some embodiments of the present invention.

Fig. 3 and Fig. 4 are drafting rollers with arc-shaped end surface rotor blades with relatively small arc length and draft rollers with arc-shaped end surface rotor blades with relatively large arc length in the embodiment of the present invention.

Fig. 5, Fig. 6 and Fig. 7 are schematic cross-sectional views of arc-shaped end face rotor blades with different arc-shaped end face arc radii, different arc-shaped end face radians, and arc-shaped end face arc chord lengths provided by the present invention; wherein, A is the arc-shaped end face radian , B is the center angle of the arc-shaped end face corresponding to the center of the roller, and C is the arc chord length of the arc-shaped end face.

FIG. 8 is a front view of the structure in FIG. 3 .

Fig. 9 is a schematic diagram of a spinning assembly provided by the present invention.

Fig. 10 is a schematic structural view of a drafting roll for spinning provided in some other embodiments of the present invention.

Figure 11 is the structure in Figure 10.

In the figure, 1. drafting roller; 11. roller shaft; 2. circumferential surface of drafting roller; 3. arc-shaped end surface rotating blade; 4. arc-shaped end surface; 5. tow.

It should be noted that these drawings and text descriptions are not intended to limit the concept scope of the present invention in any way, but illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention , but not to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The embodiment of the present invention aims at the actual needs of production, technology and product development, etc., overcomes the deficiencies of the existing technical solutions, and provides a spinning drafting roller 1 that can realize the drafting function and can prevent wool from sticking to the roller and entanglement at the same time. , the drafting roller 1 has the advantages of being practical, directly feasible, remarkable in effect and low in cost.

The present invention is based on the root cause of the generation and existence of wool filament wrapping phenomenon, and on the premise of not reducing the process performance, increasing the process links and the difficulty of production operation, starting from the equipment point of view, a new and operable equipment solution is proposed. By designing and controlling the contact point, contact line and contact surface of the tow 5 and the drafting roller 1 in terms of form and quantity, the stickiness of wool, weak and uneven filaments on the roller surface can be greatly reduced. The adhesion area and strength can be greatly reduced or eliminated, and the phenomenon of wool yarn sticking to the roller and entanglement can be greatly reduced, and at the same time, the necessary interaction between the tow 5 and the roller can be maintained, so as to meet the drafting demand and achieve the purpose of drafting.

The outside of the circumferential surface 2 of the drafting roller provided in the embodiment of the present invention is formed by the arc-shaped end face rotating blades 3 arranged at regular intervals, that is, the arc-shaped end faces 4 of the plurality of arc-shaped end face rotating blades 3 jointly form The outer side of the circumferential surface of the drafting roller 1 that is in contact with the tow 5 . The structural parameters of the arc-shaped end face rotor 3 include the end face radian, the end arc chord length, the length of the rotor blade, the distance between the ends of the rotor blades and the number of rotor blades, which can be flexibly designed according to the arrangement rules of the arc-shaped end face rotor 3 and the actual spinning needs, Various structural parameters of the above-mentioned arc-shaped end face rotor blade 3 are customized. The arc chord length of the above-mentioned end surface, the length of the rotor blades, the distance between the rotor blade ends and the number of rotor blades vary with the overall size of the roller, and various structural parameters need to meet the conditions that can be distributed and set on the circumference.

The curvature of the end surface of the above-mentioned arc-shaped end surface rotor blade 3 is ≤300°.

The distance between the above-mentioned two adjacent arc-shaped end face rotating blades 3 is ≤ the radius of the drafting roller 1 .

In some embodiments of the present invention, the direction of the central axis of the arc-shaped end blades 3 is parallel to the roller axis 11 , and the arc-shaped end blades 3 are distributed symmetrically or evenly around the roller axis 11 of the drafting roller 1 . In some other embodiments of the present invention, there is a crossing angle α between the direction of the central axis of the arc of the above-mentioned arc-shaped end surface rotor blade 3 and the direction of the roller axis 11 of the drafting roller 1, and the crossing angle α≤45°, and the arc The impellers 3 are symmetrically or uniformly distributed around the roller shaft 11.

The above-mentioned arc-shaped end face rotor blade 3 includes a body and a coating covering the outside of the body. Among them, the material of the body of the arc-shaped end face rotor 3 is metal, stainless steel, ceramics or composite materials; the coating surface of the arc-shaped end face rotor 3 is made of composite functional materials, such as quartz, rubber, alloy, etc. The friction performance between the tow 5 and the arc-shaped end face 4 may improve the anti-corrosion effect of the roll body.

The drafting roller 1 of the present invention can be used alone, in combination, or in combination with other rollers.

The drafting roll 1 of the present invention can be used in wet, dry and wet spinning processes of regenerated cellulose fiber, seaweed fiber, chitosan fiber and the like.

The drafting roller 1 described in the present invention can be used for drafting of fine denier, ultra-fine denier, high-performance fiber and the like, and has significant advantages.

The drafting roller 1 of the present invention is different from the drafting roller 1 that is directly grooved on the circular roller, and there are significant differences in shape, structure and use, and the specific differences are:

1) In terms of shape and structure, the outside of the peripheral surface 2 of the drafting roller of the embodiment of the present invention includes arc-shaped protrusions arranged at intervals, while the circular roller is directly grooved on the circular roller. The contact portion between the drafting roller 1 and the tow 5 in the embodiment of the present invention is the above-mentioned arc-shaped protrusion, the contact portion is generally a line, and the circular roller is a belt or surface.

2) In terms of function, the drafting roller 1 of the embodiment of the present invention has the effect of preventing the adhesion of wool and broken filaments, guiding the flow, and enhancing the torque to prevent slipping, while the circular roller mainly has the function of guiding the flow.

3) This structural difference minimizes the contact area between the drafting roller 1 and the tow 5 in the drafting direction of the embodiment of the present invention, and the broken filaments are difficult to be adhered by the rollers, thereby blocking the possibility of roller entanglement .

Example 1

Figure 1 is a schematic cross-sectional view of a drafting roller 1 provided by an embodiment of the present invention, d is the distance between two adjacent arc-shaped end surface rotor blades 3, and D is the diameter of the roller, which can also indicate that they are in the same radial direction The sum of the lengths of the two arc-shaped end face rotor blades 3, that is, the radius of the roller is equal to the length of the rotor blades. Fig. 2 shows a drafting roller 1 with more arc-shaped end face rotor blades 3 .

Fig. 3 and Fig. 4 respectively show the drafting roller 1 with the arc-shaped end surface rotor blade 3 with a small arc length and the drafting roller 1 with the arc-shaped end surface rotor blade 3 with a relatively large arc length in the embodiment of the present invention.

Fig. 5, Fig. 6 and Fig. 7 are respectively schematic diagrams showing the cross-sectional dimensions of the arc-shaped end surface rotor blade 3 provided by the embodiment of the present invention, which are different arc-shaped end faces 4 arc radii, different arc-shaped end faces 4 radians, and different arc-shaped end faces 4 Arc chord length of the rotor blade 3 cross section dimensions, wherein, A is the arc end face 4 radians, B is the center angle of the arc end face 4 corresponding to the center of the roller, and C is the arc chord length of the arc end face 4.

The structure in Fig. 5, Fig. 6 and Fig. 7 can be used as a schematic cross-sectional view of the arc-shaped end face rotor blade 3 of a drafting roller 1 provided by the embodiment of the present invention, specifically, the same rotor blade length, different arc-shaped end face 4 radians 1. Rotating blades 3 with arc-shaped end faces with different arc chord lengths of the arc-shaped end faces 4 .

FIG. 8 shows a situation where the arc central axis direction of the arc-shaped end surface rotor blades 3 is parallel to the roller axis 11 , and the arc-shaped end surface rotor blades 3 are symmetrically or evenly distributed around the roller axis 11 .

Fig. 9 is a schematic diagram of a combined application of drafting rollers 1 provided by the embodiment of the present invention. The front traction is arranged and combined according to the diagram to form five rollers. The tow 5 goes around in turn along the circumference of the rollers. The five rollers actively rotate to drive the tow 5 forward.

As shown in Figures 1 to 9, a drafting roll 1 for spinning is formed. The outer circumference of the roll is arranged by arc-shaped end face rotor blades 3. The end face radian and end face of the arc-shaped end face rotor blades Arc chord length, rotor blade length, distance between rotor blade ends, number of rotor blades and arrangement can be customized according to actual spinning needs.

Fig. 10 is a perspective view of an arc-shaped end rotor blade 3 in which the direction of the arc central axis is parallel to the roller axis 11 and the arc-shaped end rotor blades 3 are distributed symmetrically or uniformly around the roller axis 11 provided by the embodiment of the present invention. As shown in Fig. 3 and Fig. 8, the arc angle of the rotating blade 3 on the arc-shaped end surface of the drafting roller 1 is 180°. The arc-shaped end face rotating blade 3 of the drafting roller 1 divides the circumferential surface 2 of the drafting roller into 12 parts, and the distance between the arc-shaped end faces 4 of two adjacent arc-shaped end face rotating blades 3 is 2*(sin15°)* Radius of drafting roll 1.

The draft roller 1 is made of stainless steel as the main body of the rotating vane 3 with an arc-shaped end face. Further, the outer surface of the coating of the arc-shaped end rotor blade 3 is made of composite functional materials, such as quartz, rubber, alloy, etc., to regulate the friction performance between the tow 5 and the solid end surface or to improve the corrosion resistance of the roller body.

The drafting roller 1 described in this embodiment can be used alone, in combination, or in combination with other rollers.

The drafting roll 1 described in this embodiment can be used in wet, dry and wet spinning processes of regenerated cellulose fibers, seaweed fibers, chitosan fibers, and the like. The tow 5 and a small amount of broken filaments, endless filaments, and floating filaments on it can smoothly go around and pass through the roller circumference without sticking and wrapping, the spinning process is stable, and the draft ratio does not need to be affected by broken filaments. Discount or callback, the overall mechanical properties of tow 5 are significantly improved.

The drafting roller 1 described in this embodiment can be used for drafting of varieties such as fine denier, ultra-fine denier, and high-performance fiber, such as fine denier silk and The drawing process of ultra-fine denier yarn has significant advantages. The tow 5 and a small amount of broken filaments, endless filaments, and floating filaments on it can smoothly go around and pass through the roller circumference without sticking and entanglement. The spinning process is stable and the draft ratio can be maximized. If the wire breaks and is discounted or retracted, the overall mechanical properties of the tow 5 are significantly improved.

Example 2

As shown in Fig. 10 and Fig. 11, a drafting roller 1 for spinning is formed. The outside of the roller's peripheral surface is arranged by arc-shaped end face rotor blades 3. The end face radian and end face arc chord of the arc-shaped end face rotor blades 3 are Length, rotor length, distance between rotor blade ends, number of rotor blades and arrangement can be customized according to actual spinning needs.

The difference between the drafting roll 1 for spinning provided in this embodiment and the above embodiment is that there is an intersection angle α between the direction of the central axis of the arc of the arc-shaped end surface 4 and the direction of the roll axis 11 . FIG. 10 is a perspective view of the drafting roller 1 , and FIG. 11 is a front view of the drafting roller 1 . In the case where the above-mentioned intersection angle α≤45°, and the arc-shaped end face rotor blades 3 are distributed symmetrically or evenly around the roller shaft 11, as shown in Figure 11, the arc of the arc-shaped end face 4 of the arc-shaped end face rotor blade 3 of the drafting roller 1 The shape angle is 180°, and the arc-shaped end surface of the drafting roller 1 is divided into 12 obliquely equal parts by the rotating blade 3 of the arc-shaped end face of the drafting roller. On the plane where the section circumference of the drafting roller 1 is located, the distance between the adjacent arc-shaped end faces 4 = 2* (sin15°)*Drawing roller 1 radius. The material of the main body of the rotating vane 3 with the arc-shaped end face of the drafting roller 1 is ceramics. Further, the outer surface of the coating of the arc-shaped end rotor blade 3 is made of composite functional materials, such as quartz, rubber, alloy, etc., to regulate the friction performance between the tow 5 and the solid end surface or to improve the corrosion resistance of the roller body.

The drafting roller 1 described in this embodiment can be used alone, in combination, or in combination with other rollers.

In summary, the drafting roller 1 of the embodiment of the present invention can greatly reduce the number and area of the contact points or lines between the tow 5 and the roller while realizing the drafting effect on the tow 5 . The adhesion to floating filaments, single filaments or broken filaments highlights the entrainment effect of the tow 5 itself on wool filaments, floating filaments and broken filaments, thereby eliminating the adhesion phenomenon of wool filaments and broken filaments to the roller. It can eliminate the phenomenon of yarn winding, improve production stability and reduce labor. The drafting ratio of the process can be increased as much as possible, so that it can reach a higher drafting level that cannot be achieved because of a small amount of fluff, thereby significantly improving the mechanical properties of the fiber and the tow 5 . It can be used for the stable production of fine and ultrafine denier fibers and tows 5 and makes it easy to further reduce the denier.

The drafting roller 1 of the embodiment of the present invention can solve the problems of production stability and feasibility on the one hand, and on the other hand, can effectively improve product performance, enrich product types, and expand product application fields, which is in line with the current quality improvement and consumption reduction of products. , Differentiation, and high-performance requirements.

The drafting roll 1 described in this embodiment can be used for the wet method of regenerated cellulose fiber, seaweed fiber, chitosan fiber etc., dry-wet spinning drafting process, tow 5 and a small amount of broken filaments thereon, without The filaments and floating filaments can smoothly go around and pass through the roller circumference without sticking or entanglement, the spinning process is stable, the draft ratio does not need to be discounted or retracted due to broken filaments, and the overall mechanical properties of the tow 5 are significantly improved .

The drafting roller 1 described in this embodiment can be used for drafting of varieties such as fine denier, ultra-fine denier, and high-performance fiber, such as fine denier silk and The drawing process of ultra-fine denier yarn has significant advantages. The tow 5 and a small amount of broken filaments, endless filaments, and floating filaments on it can smoothly go around and pass through the roller circumference without sticking and entanglement. The spinning process is stable and the draft ratio can be maximized. If the wire breaks and is discounted or retracted, the overall mechanical properties of the tow 5 are significantly improved.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology of this patent Without departing from the scope of the technical solution of the present invention, when the technical content of the above hints can be used to make some changes or modifications to equivalent embodiments with equivalent changes, the implementations in the above examples can also be further combined or replaced. Without departing from the content of the technical solution of the present invention, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims (9)

1. A drafting roller for spinning is characterized by comprising a plurality of arc-shaped end surface rotating blades which are distributed at intervals along the circumferential direction of the drafting roller;

the arc end surfaces of the arc end surface rotating blades jointly form the outer side of the circumferential surface of the drawing roller;

the distance between the arc end faces of the two adjacent arc end face rotating vanes is 2 (sin 15) degrees.

2. The draft roller for spinning according to claim 1,

the drafting roller structure parameters comprise the end face radian of the arc end face rotating blades, the end face arc chord length, the length of the rotating blades, the distance between every two adjacent arc end face rotating blades, the number of the rotating blades and the diameter of the roller, and the drafting roller structure parameters correspond to the arrangement rules and the spinning requirements of the arc end face rotating blades.

3. The draft roller for spinning according to claim 2, wherein an end surface radian of the arc-shaped end surface rotating blade is not more than 300 °.

4. The drawing roller for spinning according to any one of claims 1 to 3 wherein the arc central axis direction of the arc end surface rotating blades is parallel to the roller axis, and the arc end surface rotating blades are symmetrically or uniformly distributed around the roller axis.

5. The drawing roll for spinning according to any one of claims 1 to 3, wherein the arc center axis direction of the arc end surface rotating blades and the roll axis direction of the drawing roll have a cross angle, the cross angle is less than or equal to 45 degrees, and the arc end surface rotating blades are symmetrically or uniformly distributed around the roll axis.

6. The draft roller for spinning according to any one of claims 1 to 3, wherein said curved end surface rotating blade comprises a body and a coating layer coated outside said body;

the body is made of metal, ceramic or composite material;

the coating is made of a composite functional material.

7. The drawing roll for spinning according to any one of claims 1 to 3,

the drafting roller for spinning is used for the wet spinning process or the dry spinning process of regenerated cellulose fibers, alginate fibers and chitosan fibers, or is used for the drafting process of fine denier yarns and ultra-fine denier yarns of regenerated cellulose fibers, chinlon, polyester yarns, polypropylene fibers and polyethylene fibers.

8. The drawing roll for spinning according to any one of claims 1 to 3, wherein the drawing roll for spinning is used alone, in combination of a plurality of the drawing rolls, or in combination with other rolls.

9. A spinning pack comprising the drawing roll for spinning according to any one of claims 1 to 8.

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