A kind of raised yarn and its manufacturing method

Abstract

The present invention provides a method for producing a raised yarn, which comprises using a high-pressure airflow to introduce short fibers into a multifilament transport passage while transporting the multifilament at a constant speed, the short fibers being introduced at an angle of 85 to 90° with respect to the transport direction of the multifilament. The high-pressure airflow is 1 to 2 MPa, and the short fibers are introduced at an angle of 85 to 90° with respect to the transport direction of the multifilament. In the obtained raised yarn, the short fibers exposed from the surface of the outermost monofilament of the multifilament have an average length of 3.5 mm. All or a part of the raw material for the raised yarn is processed by a general-purpose processing step that does not include an electrostatic flocking or hair cutting step. This method allows the direct production of a raised yarn, and simplifies the manufacturing process of a raised fabric. In addition, the obtained raised yarn has a uniform distribution of fuzz and high fuzz fastness, and the raised fabric has excellent heat retention and breathability.

Description

Technical Field

[0001] The present invention belongs to the technical field of yarn products and yarn processing technologies, and particularly relates to a kind of raised yarn and its manufacturing method.

Background Art

[0002] The raised fabric is covered with fluffy hairiness, and is characterized by a fluffy touch, good smoothness and elasticity, a soft luster, and further excellent heat preservation. The general raising processing methods are electrostatic flocking and shearing.

[0003] Electrostatic flocking is to apply an adhesive to the fabric in advance and then charge the fabric with static electricity by a high-voltage electric field to implant the hairiness. Although it is a conventional manufacturing method in the industry, it has the disadvantages of environmental problems related to chemical treatment and high costs.

[0004] In the fabric of the shearing process, there are two types of weft yarns, that is, the weft yarn for forming the ground weave and the weft yarn for forming the pile. When the pile weft yarn is cut, hairiness is formed. The weaving process of this method is relatively complicated. Furthermore, the mechanical properties, appearance and touch of the fabric, the fastness of the hairiness and the implementation of shearing are directly related to the weaving quality of the ground weave.

[0005] Therefore, a simple technical solution in the raised yarn and its manufacturing and application is an important issue.

Summary of the Invention

Problems to be Solved by the Invention

[0006] In order to solve the problems related to the conventional electrostatic flocking and shearing and break through their limitations, the present invention provides a kind of raised yarn and its manufacturing method.

Means for Solving the Problems

[0007] For the above problems, the present invention selects the following solutions.

[0008] During the constant-speed transportation of a multifilament containing 30 to 50 monofilaments, a method for manufacturing a raised yarn by introducing short fibers into the transportation passage of the multifilament using a high-pressure air flow, wherein the high-pressure air flow is 1 to 2 MPa, and the introduction direction of the short fibers forms an angle of 85 to 90° with respect to the transportation direction of the multifilament Moreover, the short fibers have a total introduction amount of 80 - 130 fibers / s and an average length of 15 - 25 mm. In the multi-filament transport passage, n sets of short fiber introduction points are arranged at intervals along the longitudinal direction of the multi-filament transport passage, where n is 4 - 5. Each set contains 5 - 8 short fiber introduction points. The short fiber introduction points in the same set are uniformly distributed around the central axis of the multi-filament transport passage, and the distance between two adjacent sets of short fiber introduction points is 25 - 30 mm. 。

[0009] In the present invention, during the constant-speed transportation of a multifilament, short fibers are introduced into the transportation passage of the multifilament using a high-pressure air flow. The monofilaments in the transportation passage of the multifilament are entangled with each other under the action of the air flow and move. In the process of entanglement and movement, they combine with the short fibers to form a raised yarn. The key to the formation of the fluff lies in the action of the air flow. The high-pressure air flow in the transportation passage of the multifilament disperses the monofilaments in the multifilament and further entangles them with each other. At the same time, during the process of blowing and entangling the introduced short fibers with the monofilaments in the multifilament, the short fibers are scattered among the monofilaments, and the short fibers are rotated around the central axis of the multifilament, so that the short fibers and the multifilament are firmly combined to form a firm fluff. Therefore, the angle between the introduction direction of the short fibers, that is, the air flow direction and the transportation direction of the multifilament needs to be set under predetermined conditions. If the angle is too small, the insertion of the short fibers into the multifilament is insufficient, the bonding strength between them is insufficient, and the raised quality deteriorates. If the angle is too large, the movement direction of the short fibers is opposite to the movement direction of the multifilament, and the raising effect cannot be achieved well. In the present invention, the angle between the introduction direction of the short fibers and the movement direction of the multifilament is 85 to 90°. Similarly, the pressure of the high-pressure air flow also needs to meet certain conditions. If the pressure is too small, the air flow acting force on the monofilaments and short fibers in the multifilament is weak, their entanglement is insufficient, the firmness of the fluff is insufficient, and the raised quality deteriorates. If the pressure is too large, the energy consumption is high and the manufacturing cost increases.

[0010] Preferably, in the method for manufacturing the raised yarn, The monofilament is DTY (Draw Textured Yarn) with a size of 100~150D / 30~50F, The constant-speed transport speed is 20~40m / min (for the transport speed of multifilament, considering the hairiness density, uniformity and production volume of the raised yarn, when it is set to 20~40m / min, both the quality control of the raised yarn and the production volume can be balanced.). The total introduction amount of the staple fiber is 80~130 pieces / s (the introduction amount of the staple fiber directly affects the hairiness density of the raised yarn. With this setting, it is possible to avoid insufficient hairiness caused by too small an introduction amount and blockage of the passage caused by too large an introduction amount.), and the average length of the staple fiber is 15~25mm, The staple fiber is cotton yarn, rayon, polyester fiber or wool, In the multifilament transport passage, n sets of staple fiber introduction points are arranged at intervals along the longitudinal direction of the multifilament transport passage, n is 4~5, and each set includes 5~8 staple fiber introduction points. The staple fiber introduction points in the same set are evenly distributed around the central axis of the multifilament transport passage, and the distance between two adjacent sets of staple fiber introduction points is 25~30mm. The above-mentioned total introduction amount is the sum of the staple fiber introduction amounts of all the introduction points, The introduction of the staple fiber is continuous introduction or discontinuous introduction. When continuously introduced, the hairiness of the raised yarn is continuously distributed, and when discontinuously introduced, the hairiness of the raised yarn is discretely distributed.

[0011] The present invention also provides a raised yarn manufactured by the method according to any one of the above items. The raised yarn is mainly composed of a multifilament and the hairiness on its surface. The hairiness is a staple fiber with one end being a free end and the other end being combined with the multifilament in a manner of mutual insertion, winding and / or entanglement. The distribution density of the hairiness along the longitudinal direction of the multifilament is 120~390 pieces / m.

[0012] Preferably, the above-described raised yarn is measured by the image method, the raised yarn is photographed and processed, the length of the short fibers exposed from the surface of the outermost monofilament of the multifilament is analyzed, the average value thereof is measured, and the average length of the short fibers exposed from the surface of the outermost monofilament of the multifilament is 3.5 mm.

[0013] The present invention also provides a method for manufacturing a raised fabric for manufacturing a raised fabric, wherein all or part of the raw material of the raised yarn is processed by a general processing step that does not include an electrostatic flocking or hair cutting step.

[0014] Preferably, in the method for manufacturing the raised fabric, when the weaving technique is adopted, only the weft yarn is used for the raised yarn. If the raised yarn with hairiness on the surface is used as the warp yarn, the hairiness is likely to be intertwined with each other due to the action of the heddle and reed, resulting in poor shedding and a decrease in the weaving quality. Therefore, the raised yarn is generally used as the weft yarn.

[0015] The present invention also provides raised yarn manufacturing equipment including a jet nozzle, a high-pressure air flow injection device, a short fiber transport device, and a multifilament transport device. Specifically, The nozzle is a cylindrical one including an inner cylinder, an outer cylinder, and two annular seal rings. Among them, the inner cylinder is coaxially and aligned at both ends and fitted into the outer cylinder, and further, their tops and bottoms are respectively connected via annular seal rings. The outer cylinder is provided with a through hole I and a through hole II. One end of the through hole I and the through hole II intersects with the outer wall of the outer cylinder at points a and b, and the other end intersects with the inner wall of the outer cylinder at points d and e. The through hole I and the through hole II are arranged at a certain interval from bottom to top along the height direction of the outer cylinder. The inner cylinder is provided with n (n = 4 to 5) sets of through holes. The number of through holes IV7 in any set is 5 to 8. One end of each through hole IV intersects with the outer wall of the inner cylinder at point p, and the other end intersects with the inner wall of the inner cylinder at point q. Along the height direction of the inner cylinder, point p is located below point q. The first to n sets of through holes IV are arranged at a certain interval from bottom to top along the height direction of the inner cylinder. The angle formed by the central axis of each through hole IV and the central axis of the inner cylinder is 85 to 90 degrees. The inlet of the through hole I, i.e., point a, and the inlet of the through hole II, i.e., point b, are both connected to a high-pressure air flow injection device that provides a high-pressure air flow. Through the cooperation of the air flow pressure and the jet nozzle dimensions, the pressure in the through hole IV becomes 1 to 2 MPa. The through hole I is an introduction passage for short fibers. The short fiber transport device that transports short fibers to the through hole I is located on the side of the through hole I. The cavity in the inner cylinder with the bottom as the inlet and the top as the outlet is a transport passage for multifilaments. The multifilament transport device transports multifilaments to the cavity in the inner cylinder. The number of monofilaments included in the multifilament is 30 to 50. The through hole II is a supply passage used to inject high-pressure air flow into the air chamber formed by the combination of the outer cylinder, the inner cylinder, and two annular seal rings to maintain a certain speed and pressure of the air flow in the chamber.

[0016] The settings for the through hole I and the through hole II ensure that the short fibers are introduced into the air chamber at a certain directional speed through the short fiber transport device by the air flow, then rotate and advance along the air chamber by the air flow, and enter the multifilament transport passage through the through hole IV. Moreover, the monofilaments of the multifilaments passing through the multifilament transport passage are intertwined and transferred with each other by the air flow, and combined with the short fibers to form a hairy yarn.

[0017] Also, the purpose of the setting that the through hole I in the jet nozzle is not directly connected to the multifilament transport passage but to the air chamber is that if the through hole I as the short fiber transport passage is directly connected to the multifilament transport passage, non-uniform dispersion of the fibers will occur and it will be difficult to control the uniformity of the hairiness distribution. Therefore, when the short fibers first enter the air chamber and then are dispersed by a plurality of through holes IV and enter the multifilament transport passage, on the one hand, the uniformity of the hairiness can be improved, and on the other hand, since the short fibers can obtain sufficient acceleration in the air chamber, the fastness of the hairiness can be improved.

[0018] Preferably, in the above-mentioned hairy yarn manufacturing equipment, The central axis of the through hole I is parallel to the central axis of the through hole II (so that the directions of the airflows introduced by the through hole I and the through hole II are the same, and the airflow acceleration of the short fibers becomes more significant.), and does not intersect with the central axis of the outer cylinder (that is, the extension line of the through hole I does not face the central axis of the outer cylinder, so that good acceleration of the short fibers can be obtained.). The straight line passing through points a and d is located in the same plane perpendicular to the central axis of the outer cylinder at an angle of 5 to 10° with the straight line passing through points a and g (located on the central axis of the outer cylinder). The outer cylinder is also provided with a through hole III to prevent the short fibers from blocking the through hole IV. One end of the through hole III intersects with the outer wall of the outer cylinder at point c, and the other end intersects with the inner wall of the outer cylinder at point f. The through hole I, the through hole II, and the through hole III are arranged at regular intervals from bottom to top along the height direction of the outer cylinder. The inlet of the through hole III, that is, point c, is connected to a high-pressure airflow injection device that provides airflows of 1 to 2 MPa, 0.5 to 0.8 MPa, and 0.2 to 0.3 MPa to the through hole I, the through hole II, and the through hole III, respectively. The inner diameter of the outer cylinder is 0.2 to 0.5L, the wall thickness is 1.2 to 2L, and the height is 4 to 6L (where L is the average length of the short fibers). The through hole I, the through hole II, and the through hole III are all circular. The diameter of the through hole I is 3 to 5 mm, the diameter of the through hole II is 3 to 5 mm, and the diameter of the through hole III is 1 to 3 mm. The distances from the centers of points d, e, and f to the bottom of the outer cylinder are 6 to 10 mm, 46 to 50 mm, and 86 to 106 mm, respectively. The inner diameter of the inner cylinder is 0.2 to 0.5L, and the wall thickness is 1.2 to 2L. All n groups of through holes IV are circular and their diameters are all 1 to 2 mm. The distance between the central points of two adjacent groups of through holes IV is 20 to 30 mm. The distance from the central point of the first group of through holes IV to the bottom of the inner cylinder is 10 to 15 mm. Due to the cooperation of the through hole I, the through hole II, the through hole III, the airflow pressure in the through hole III, the diameters of the through holes I to III, and the inner diameter of the inner cylinder, the airflow pressure in the through hole IV becomes 1 to 2 MPa. The through-hole III is equal in number and coaxial with the nth group of through-holes IV (the short fibers introduced into the air chamber will mostly transfer to the multi-filament transport passage through the through-holes IV of each group before the nth group. However, by doing so, the remaining short fibers can enter the through-holes IV more smoothly due to the air flow pressure in the through-holes III, and the congestion in the air chamber can be prevented.). The through-holes IV of the same group are uniformly distributed along the circumference of the central axis of the inner cylinder, To facilitate the transfer of the short fibers introduced through the through-hole I to the through-holes IV, along the height direction of the inner cylinder and the outer cylinder, the first group of through-holes IV is located above the through-hole I, The short fiber transport device is composed of three rollers named rear, middle, and front along the movement direction of the fibers and three rubber rollers corresponding to them respectively, which give a total elongation ratio of 5 - 30 times and a transport volume of 5 - 8 g / 10 m to the short fiber yarn. Additionally, a high-pressure air flow injection device is provided between the delivery side of the front roller with a linear velocity of 8 - 15 m / min and the through-hole I. Therefore, the short fibers coming from the delivery side of the front roller of the short fiber transport device immediately enter the through-hole I under the action of the air flow of the high-pressure air flow injection device, The multi-filament transport device includes a feed roller located below the inner cylinder and a guide roller located above the inner cylinder. Furthermore, the linear velocity ratio between the feed roller and the guide roller is set to 1.01 - 1.05 (so that when the multi-filament hits the air flow, not only do the monofilaments in it intertwine with each other, but the multi-filament itself also rolls and sways, thus improving the entanglement fastness between the multi-filament and the short fiber and obtaining a good raising effect). The linear velocity of the feed roller is set to 20 - 40 m / min (the linear velocity of the feed roller affects the hairiness density of the raised yarn regarding the short fiber transport volume).

[0019] The principle of the present invention is as follows. The multifilament moving through the transport passage hits the airflow, causing the monofilaments therein to entangle with each other. At this time, short fibers are also introduced through the through-hole IV. Then, the short fibers with a certain initial velocity move together with the multifilament by the airflow. Among them, the short fibers intersect with the multifilament, that is, the short fibers wind around the multifilament, or one end entangles with the monofilaments in the multifilament and the other end is exposed on the surface of the multifilament, forming a raised yarn. Different from the prior arts such as electrostatic flocking for implanting fluff on the surface of the fabric by static electricity and fluff cutting for cutting the pile weft of the fabric, the present invention is to make a raised yarn and use the raised yarn as a weft to weave a raised fabric.

Advantages of the Invention

[0020] The advantages of the present invention are as follows: 1. The raised yarn is directly spun from the multifilament and short fibers, which is simple and has a wide application range; 2. The raised yarn, as a weft, directly gives the fabric a fluffing effect and no post-treatment is required; 3. The fluff fastness of the raised fabric is improved and the processing flow is shortened; 4. The manufacturing method is simpler than the prior art, longer fluff can be obtained compared with the raised fabric by fluff cutting, and better air permeability and environmental friendliness can be achieved compared with the raised fabric by electrostatic flocking (the air permeability of the raised fabric by electrostatic flocking is not very good because an adhesive is used to fix the fluffing).

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0022] Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples as long as the gist thereof is not exceeded. Even if those skilled in the art who have read the content of the present invention are allowed to modify various aspects of the present invention, it is also limited within the scope of the claims of the present invention as an equivalent form of the present invention.

[0023] Example 1 Specifically, the method for manufacturing a raised yarn is to introduce short fibers into the transport passage of multifilaments moving at a speed of 30 m / min by means of a high-pressure air flow to manufacture a raised yarn. Among them, the multifilament is 100D / 30F DTY; the pressure of the high-pressure air flow is 1 MPa; the angle between the introduction direction of the short fibers and the transport direction of the multifilament is 87°; the short fibers are rayon, the total transport amount thereof is 95 pieces / s, and the average length thereof is 18 mm; four sets of introduction positions are provided along the longitudinal direction of the multifilament yarn guide tube at intervals of 27 mm, and any one of the introduction positions is composed of seven introduction points uniformly distributed along the circumference of the central axis of the yarn guide tube. The obtained raised yarn is mainly composed of multifilaments and the hairs on its surface. The hairs are short fibers with one end being a free end and the other end being combined with the multifilaments in a manner of mutual insertion, winding and / or entanglement. The hair density is 190 pieces / m, and the average length of the short fibers exposed from the surface of the multifilament is 3.5 mm. Using the obtained raised yarn as the weft yarn and 32 S cotton yarns as the warp yarns, a plain-woven raised fabric with a warp density of 120 pieces / 10 cm and a weft density of 150 pieces / 10 cm is manufactured through a weaving process.

[0024] Example 2 Specifically, the method for manufacturing the napped yarn is to introduce staple fibers into the transport passage of multifilaments moving at a speed of 25 m / min by means of a high-pressure air flow to manufacture the napped yarn. Among them, the multifilament is 100D / 30F DTY; the pressure of the high-pressure air flow is 1 MPa; the angle between the introduction direction of the staple fibers and the transport direction of the multifilament is 86°; the staple fibers are cotton, the total transport amount thereof is 85 pieces / s, and the average length thereof is 18 mm; four sets of introduction positions are provided along the longitudinal direction of the multifilament yarn guide tube at intervals of 26 mm, and any one of the introduction positions is composed of six introduction points uniformly distributed along the circumference of the central axis of the yarn guide tube. The obtained napped yarn is mainly composed of multifilaments and the hairs on its surface. The hairs are staple fibers with one end being a free end and the other end being combined with the multifilaments in a manner of mutual insertion, winding and / or entanglement. The hair density is 204 pieces / m, and the average length of the staple fibers exposed from the surface of the multifilament is 3.5 mm. Using the obtained napped yarn as the weft yarn and 28 S of cotton yarn as the warp yarn, a plain woven napped fabric with a warp density of 110 pieces / 10 cm and a weft density of 150 pieces / 10 cm is manufactured by a weaving process.

[0025] Example 3 Specifically, the method for manufacturing the napped yarn is to introduce staple fibers into the transport passage of multifilaments moving at a speed of 30 m / min by means of a high-pressure air flow to manufacture the napped yarn. Among them, the multifilament is 100D / 30F DTY; the pressure of the high-pressure air flow is 1 MPa; the angle between the introduction direction of the staple fibers and the transport direction of the multifilament is 87°; the staple fibers are rayon, the total transport amount thereof is 95 pieces / s, and the average length thereof is 18 mm; four sets of introduction positions are provided along the longitudinal direction of the multifilament yarn guide tube at intervals of 27 mm, and any one of the introduction positions is composed of seven introduction points uniformly distributed along the circumference of the central axis of the yarn guide tube. The obtained hairy yarn is mainly composed of multifilaments and the hairs on its surface. The hairs are short fibers with one end being a free end and the other end being joined to the multifilaments in a manner of mutual insertion, winding, and / or entanglement. The hair density is 190 pieces / m, and the average length of the short fibers exposed from the surface of the multifilaments is 3.5 mm. Using the obtained hairy yarn as the weft yarn and 32 S cotton yarns as the warp yarns, a plain woven hairy fabric with a warp density of 120 pieces / 10 cm and a weft density of 150 pieces / 10 cm is manufactured through a weaving process.

[0026] Example 4 The method for manufacturing the hairy yarn is specifically to introduce short fibers into the transport passage of the multifilaments moving at a speed of 35 m / min by means of a high-pressure air flow to manufacture the hairy yarn. Among them, the multifilaments are 100D / 30F DTY; the pressure of the high-pressure air flow is 2 MPa; the angle between the introduction direction of the short fibers and the transport direction of the multifilaments is 88°; the short fibers are polyester, the total transport amount is 100 pieces / s, and the average length is 20 mm; 5 sets of introduction positions are provided along the longitudinal direction of the multifilament yarn guide tube at intervals of 28 mm, and any one of the introduction positions is composed of 8 introduction points evenly distributed along the circumference of the central axis of the yarn guide tube. The obtained hairy yarn is mainly composed of multifilaments and the hairs on its surface. The hairs are short fibers with one end being a free end and the other end being joined to the multifilaments in a manner of mutual insertion, winding, and / or entanglement. The hair density is 171 pieces / m, and the average length of the short fibers exposed from the surface of the multifilaments is 4 mm. Using the obtained hairy yarn as the raw material, a plain knitted hairy fabric with a horizontal density of 15 pieces / 5 cm and a vertical density of 8 pieces / 5 cm is manufactured through a weft knitting process.

[0027] Example 5 The method for manufacturing the raised yarn specifically involves introducing short fibers into the transport passage of multifilaments moving at a speed of 40 m / min by means of a high-pressure air flow to produce the raised yarn. Among them, the multifilaments are 100D / 30F DTY; the pressure of the high-pressure air flow is 2 MPa; the angle between the introduction direction of the short fibers and the transport direction of the multifilaments is 89°; the short fibers are wool, the total transport amount is 115 pieces / s, and the average length is 25 mm; 5 sets of introduction positions are provided along the longitudinal direction of the multifilament yarn guiding tube at intervals of 29 mm, and any one of the introduction positions is composed of 7 introduction points evenly distributed along the circumference of the central axis of the yarn guiding tube. The obtained raised yarn is mainly composed of multifilaments and the fiber hairs on its surface. The fiber hairs are short fibers with one end being a free end and the other end being combined with the multifilaments in a manner of mutual insertion, winding, and / or entanglement. The fiber hair density is 173 pieces / m, and the average length of the short fibers exposed from the surface of the multifilaments is 5 mm. Using the obtained raised yarn as the raw material, a plain knitted raised fabric with a horizontal density of 20 pieces / 5 cm and a vertical density of 16 pieces / 5 cm is manufactured through the weft knitting process.

[0028] Example 6 The method for manufacturing the raised yarn specifically involves introducing short fibers into the transport passage of multifilaments moving at a speed of 40 m / min by means of a high-pressure air flow to produce the raised yarn. Among them, the multifilaments are 100D / 30F DTY; the pressure of the high-pressure air flow is 2 MPa; the angle between the introduction direction of the short fibers and the transport direction of the multifilaments is 90°; the short fibers are wool, the total transport amount is 130 pieces / s, and the average length is 25 mm; 6 sets of introduction positions are provided along the longitudinal direction of the multifilament yarn guiding tube at intervals of 30 mm, and any one of the introduction positions is composed of 6 introduction points evenly distributed along the circumference of the central axis of the yarn guiding tube. The obtained napped yarn is mainly composed of multifilaments and the fiber hairs on its surface. The fiber hairs are short fibers with one end being a free end and the other end being joined to the multifilaments in a manner of mutual insertion, winding, and / or entanglement. The fiber hair density is 195 fibers / m, and the average length of the short fibers exposed from the surface of the multifilaments is 5 mm. Using the obtained napped yarn as the raw material, a warp-knitted napped fabric with a horizontal density of 18 per 5 cm and a vertical density of 14 per 5 cm is manufactured through a warp knitting process.

[0029] Example 7 The method for manufacturing the napped yarn is almost the same as that in Example 1, and the difference is only that the short fibers are transported to the transport passage of the multifilaments in a discontinuous rather than continuous manner. Among them, the same total introduced amount of short fibers as in Example 1 is transported once per second. The obtained napped yarn includes hairless parts and hairy parts arranged alternately in the longitudinal direction. Among them, the hairless parts are mainly composed of multifilaments, and the hairy parts are mainly composed of multifilaments and the fiber hairs on their surface; the fiber hairs are short fibers with one end being a free end and the other end being joined to the multifilaments in a manner of mutual insertion, winding, and / or entanglement; in the longitudinal direction, the fiber hair density of the hairy parts is 240 fibers / m, and the average length of the short fibers exposed from the surface of the multifilaments is 3 mm. Using the obtained napped yarn as the weft yarn and 32 S cotton yarns as the warp yarns, a plain-woven napped fabric with a warp density of 120 per 10 cm and a weft density of 150 per 10 cm is manufactured through a weaving process.

[0030] For the manufacture of the napped yarns in the above Examples 1 to 7, multiple types of equipment can be employed, but the present invention provides only one type of manufacturing equipment as an example. Referring to FIGS. 1 to 7, the manufacturing equipment of the present invention includes a jet nozzle 4, a high-pressure air flow injection device, a short fiber transport device, and a multifilament transport device; The short fiber conveying device is composed of three rollers named rear, middle, and front along the movement direction of the fiber and three rubber rollers corresponding to them respectively. The linear velocity of the front roller is set to 8 - 15 m / min to give a total elongation ratio of 5 - 30 times and a conveying volume of 5 - 8 g / 10 m to the short fiber yarn; The multifilament conveying device includes a feed roller 2 located below the inner cylinder and a guide roller 3 located above the inner cylinder. Furthermore, the linear velocity ratio of the feed roller 2 to the guide roller 3 is 1.01 - 1.05, and the linear velocity of the feed roller 2 is 20 - 40 m / min; The jet nozzle 4 is a cylindrical one including an inner cylinder, an outer cylinder, and two annular seal rings. Furthermore, the inner cylinder is coaxially and aligned at both ends and fitted into the outer cylinder, and the inner cylinder and the outer cylinder are connected through annular seal rings at both the top and the bottom to form an air chamber; The outer cylinder is provided with a through hole I8, a through hole II9, and a through hole III10. One end of the through hole I8, the through hole II9, and the through hole III10 intersects with the outer wall of the outer cylinder at points a, b, and c respectively, and the other end intersects with the inner wall of the outer cylinder at points d, e, and f respectively. The through hole I8, the through hole II9, and the through hole III10 are arranged at regular intervals from bottom to top along the height direction of the outer cylinder; The inner cylinder is provided with n (n = 4 - 5) sets of through holes IV7. The number of through holes IV7 in any set is 5 - 8. One end of each through hole IV7 intersects with the outer wall of the inner cylinder at point p, and the other end intersects with the inner wall of the inner cylinder at point q. Along the height direction of the inner cylinder, point p is located below point q. The 1st - nth sets of through holes IV7 are arranged at regular intervals from bottom to top along the height direction of the inner cylinder, and the angle formed by the central axis of each through hole IV7 and the central axis of the inner cylinder is 85 - 90 degrees; The through hole I8 is an introduction passage for short fibers. The short fiber conveying device that transports short fibers to the through hole I8 is located on the side of the through hole I8. The cavity in the inner cylinder with the bottom as the inlet and the top as the outlet is the multifilament conveying passage 5. The multifilament conveying device transports multifilaments into the cavity in the inner cylinder. The number of monofilaments included in the multifilament is 30 - 50; The central axis of the through hole I8 is parallel to the central axis of the through hole II9 and does not intersect the central axis of the outer cylinder. The straight line passing through points a and d is located in the same plane perpendicular to the central axis of the outer cylinder at an angle of 5 to 10° with the straight line passing through points a and g (located on the central axis of the outer cylinder); The through hole III10 is equal in number and coaxial with the nth group of through holes IV7. The through holes IV7 in the same group are uniformly distributed along the circumference of the central axis of the inner cylinder. The inner diameter of the outer cylinder is 2.5 - 4L, the wall thickness is 1.2 - 2L, and the height is 4 - 6L (where L is the average length of the short fibers). The through holes I8, II9, and III10 are all circular with diameters of 3 - 5 mm, 3 - 5 mm, and 1 - 3 mm respectively. The distances from the centers of points d, e, and f to the bottom of the outer cylinder are 6 - 10 mm, 46 - 50 mm, and 86 - 106 mm respectively; The inner diameter of the inner cylinder is 0.2 - 0.5L, and the wall thickness is 1.2 - 2L. The n groups of through holes IV7 are all circular and their diameters are all 1 - 2 mm. The distance between the center points of two adjacent groups of through holes IV7 is 20 - 30 mm, and the distance from the center point of the first group of through holes IV to the bottom of the inner cylinder is 10 - 15 mm; Along the height direction of the inner cylinder and the outer cylinder, the first group of through holes IV7 is located above the through hole I8; The inlet of the through hole I8, that is, point a, the inlet of the through hole II, that is, point b, and the inlet of the through hole III10, that is, point c, are all connected to a high - pressure air - flow injection device that provides high - pressure air flow. Therefore, they receive air flows of 1 - 2 MPa, 0.5 - 0.8 MPa, and 0.2 - 0.3 MPa respectively. Furthermore, due to the cooperation of the air - flow pressure and the dimensions of the jet nozzle 4, the pressure in the through hole IV7 becomes 1 - 2 MPa. Hereinafter, Example 1 will be given to explain in more detail the production of the raised yarn with the said equipment. The process parameters in this equipment are as follows. The linear velocity of the front roller is set at 15 m / min, the total elongation ratio of the staple fiber yarn is 10 times, the total transport volume is 8 g / 10 min, the linear velocity ratio between the feed roller 2 and the guide roller 3 is 1.01, and the linear velocity of the feed roller 2 is 20 m / min; for the through-hole IV7, the number of sets n is 4, the number of holes in one set is 5, and the central axis forms an 85° angle with the central axis of the inner cylinder; the straight line passing through points a and d is located in the same plane perpendicular to the central axis of the outer cylinder at a 5° angle with the straight line passing through points a and g; The inner diameter of the outer cylinder is 2.5L, the wall thickness is 2L, and the height is 6L (L is 15 mm, the average length of the staple fiber); the through-holes I8, II9, and III10 are all circular with diameters of 5 mm, 5 mm, and 3 mm respectively; the distances from the centers of points d, e, and f to the bottom of the outer cylinder are 10 mm, 50 mm, and 106 mm respectively; The inner diameter of the inner cylinder is 0.5L and the wall thickness is 2L; all n sets of through-holes IV7 are circular with a diameter of 2 mm; the distance between the center points of two adjacent sets of through-holes IV7 is 25 mm, and the distance from the center point of the first set of through-holes IV to the bottom of the inner cylinder is 12 mm; the inlets of the through-holes I8, i.e., point a, the inlet of the through-hole II, i.e., point b, and the inlet of the through-hole III10, i.e., point c, are all connected to a high-pressure air flow injection device that provides high-pressure air flow and receive air flows of 2 MPa, 0.8 MPa, and 0.3 MPa respectively. Furthermore, due to the cooperation of the air flow pressure and the dimensions of the jet nozzle 4, the pressure inside the through-hole IV7 becomes 1 MPa. The manufacturing process of the raised yarn is to transport the multifilament into the cavity inside the inner cylinder (i.e., the multifilament transport passage 5) by a multifilament transport device, transport the staple fiber to the through-hole I8 by a staple fiber transport device, and further continuously introduce the staple fiber into the multifilament transport passage 5 by the high-pressure air flow provided by the high-pressure air flow injection device to obtain the raised yarn. Among them, the multifilament is 100D / 30F DTY, the staple fiber is cotton yarn, and the total transport volume to the multifilament transport passage 5 is 80 pieces / s. The obtained hairy yarn is mainly composed of multifilaments and the hairy fibers on its surface. The hairy fibers are short fibers with one end being a free end and the other end being combined with the multifilaments in a manner of mutual insertion, winding and / or entanglement. The hairy fiber density is 240 fibers / m, and the average length of the short fibers exposed from the surface of the multifilaments is 3 mm.

Claims

1. 1. A method for producing a raised yarn, comprising the steps of: introducing short fibers into a transport passage of a multifilament containing 30 to 50 monofilaments at a constant speed using a high-pressure air flow to produce a raised yarn, The high pressure airflow is 1 to 2 MPa, The introduction direction of the short fibers forms an angle of 85 to 90° with respect to the transport direction of the multifilament, The short fibers have a total introduction rate of 80 to 130 fibers / s and an average length of 15 to 25 mm; In the multifilament transport passage, n sets of short fiber introduction points are arranged at intervals along the longitudinal direction of the multifilament transport passage, the n being 4 to 5, each set including 5 to 8 short fiber introduction points, the short fiber introduction points of the same set are uniformly distributed around the central axis of the multifilament transport passage, and the distance between two adjacent sets of short fiber introduction points is 25 to 30 mm. A method for manufacturing brushed yarn.

2. The method for producing brushed yarn according to claim 1, characterized in that the multifilament is a DTY (Drawn Textured Yarn) having a standard of 100 to 150D / 30 to 50F.

3. 2. The method for producing brushed yarn according to claim 1, wherein the constant speed transport is performed at a speed of 20 to 40 m / min.

4. The method for producing brushed yarn according to claim 1, wherein the staple fibers are cotton yarn, rayon, polyester fiber or wool.

5. The method for producing brushed yarn according to claim 1, characterized in that the introduction is continuous introduction or discontinuous introduction.

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