PILE YARN, PREPARATION METHOD AND APPLICATION THEREOF

Abstract

A pile yarn, preparation method and application thereof are provided. The method includes: in the process of uniform motion of multifilaments, using the high-pressure airflow to feed short fibers into the fiber transfer channel of multifilaments to prepare the pile yarn; the number of monofilaments in the multifilament is 30-50; the pressure of the high-pressure airflow is 1-2 MPa; the included angle of 85-90 is formed between the feeding direction of the short fibers and the transferring direction of the multifilaments; the average length of short fibers exposed from the outermost monofilament surface of the multifilament in the prepared pile yarn is 3-5 mm. The application includes: using the pile yarn as all or part of the raw material, processing according to the general processing technology to prepare the pile fabric; the general processing technology is a technology which does not contain an electrostatic flocking or pile cutting procedure.

Claims

1. A method for preparing a pile yarn, comprising: in a process of a uniform motion of multifilaments, using a high-pressure airflow to feed short fibers into a fiber transfer channel of the multifilaments to prepare the pile yarn; wherein a number of monofilaments in the multifilaments is 30-50; wherein a pressure of the high-pressure airflow is 1-2 MPa; and wherein an included angle of 85-90 is formed between a feeding direction of the short fibers and a transferring direction of the multifilaments.

2. The method according to claim 1, wherein the multifilaments are a draw textured yarn (DTY); wherein a specification of the draw textured yarn is 100-150_D/30-50_F.

3. The method according to claim 1, wherein a speed of the uniform motion is 20-40 m/min.

4. The method according to claim 1, wherein a total feeding amount of the short fibers is 80-130/s; wherein an average length of the short fibers is 15-25 mm.

5. The method according to claim 4, wherein each of the short fibers is a cotton fiber, a viscose fiber, a polyester fiber, or a wool fiber.

6. The method according to claim 4, wherein the fiber transfer channel of the multifilaments has a total of n groups of short fiber feeding points arranged at intervals along a length direction of the fiber transfer channel of the multifilaments, wherein n is 4-5, each of the n groups contains 5-8 short fiber feeding points, short fiber feeding points of a same group are evenly distributed around a central axis of a fiber transfer channel of internal multifilaments, and a distance between two adjacent groups of the short fiber feeding points is 25-30 mm.

7. The method according to claim 1, wherein a feeding of the short fibers is a continuous feeding or a discontinuous feeding.

8. A pile yarn prepared by the method according to claim 1, comprising the multifilaments and piles on a surface of the multifilaments; wherein each of the piles refers to a short fiber with a first end and a second end, the first end is a free end, and the second end is bonded to the multifilaments by a mutual interlacing, a wrapping, and/or a tangling; along a length direction of the multifilaments, a distribution density of the piles is 120-390/m.

9. The pile yarn according to claim 8, wherein an average length of short fibers exposed from an outermost monofilament surface of the multifilaments is 3-5 mm.

10. A method for preparing a pile fabric, comprising: using the pile yarn according to claim 8 as all or part of raw materials, processing according to a general processing technology to prepare the pile fabric; wherein the general processing technology is a technology not containing an electrostatic flocking procedure or a pile cutting procedure.

11. The pile yarn according to claim 8, wherein in the method, the multifilaments are a draw textured yarn (DTY); a specification of the draw textured yarn is 100-150 D/30-50F.

12. The pile yarn according to claim 8, wherein in the method, a speed of the uniform motion is 20-40 m/min.

13. The pile yarn according to claim 8, wherein in the method, a total feeding amount of the short fibers is 80-130/s; an average length of the short fibers is 15-25 mm.

14. The pile yarn according to claim 13, wherein each of the short fibers is a cotton fiber, a viscose fiber, a polyester fiber, or a wool fiber.

15. The pile yarn according to claim 13, wherein in the method, the fiber transfer channel of the multifilaments has a total of n groups of short fiber feeding points arranged at intervals along a length direction of the fiber transfer channel of the multifilaments, wherein n is 4-5, each of the n groups contains 5-8 short fiber feeding points, short fiber feeding points of a same group are evenly distributed around a central axis of a fiber transfer channel of internal multifilaments, and a distance between two adjacent groups of the short fiber feeding points is 25-30 mm.

16. The pile yarn according to claim 8, wherein in the method, a feeding of the short fibers is a continuous feeding or a discontinuous feeding.

17. The method according to claim 10, wherein in the pile yarn, an average length of short fibers exposed from an outermost monofilament surface of the multifilaments is 3-5 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0052] FIG. 1 is a schematic diagram of the positional relationship between the multifilament and single fiber stream feeding nozzles;

[0053] FIG. 2 is a schematic diagram of the structure of the nozzle used in the present invention;

[0054] FIG. 3 is a cross-sectional schematic diagram of through hole I of the nozzle used in the present invention;

[0055] FIG. 4 is a cross-sectional schematic diagram of one group of through holes IV of the nozzle used in the present invention;

[0056] FIG. 5 is a cross-sectional schematic diagram of through hole III of the nozzle used in the present invention;

[0057] wherein the numbers in the figures are respectively represented: 1multifilament, 2feeding roller, 3yarn drawing roller, 4nozzle, 5fiber transfer channel of multifilaments, 6air cavity, 7through hole IV, 8through hole I, 9through hole II, 10through hole III.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0058] Based on above mentioned method, the following embodiments are carried out for further demonstration in the present invention. It is to be understood that these embodiments are only intended to illustrate the invention and are not intended to limit the scope of the invention. In addition, it should be understood that after reading the contents described in the present invention, those technical personnel in this field can make various changes or modifications to the invention, and these equivalent forms also fall within the scope of the claims attached to the application.

Example 1

[0059] A method for preparing a pile yarn, the specific process is as follows: [0060] in the process of uniform motion at 20 m/min of multifilaments, using a high-pressure airflow to feed short fibers into a fiber transfer channel of multifilaments to prepare the pile yarn; [0061] the multifilament is a DTY filament, the specification of the DTY filament is 100D/30F; the pressure of the high-pressure airflow is 1 MPa; the included angle between the feeding direction of short fibers and the transferring direction of multifilaments is 85; [0062] the short fiber is a cotton fiber; the total feeding amount of short fibers is 80/s; the average length of short fibers is 15 mm; [0063] the fiber transfer channel of multifilaments has a total of n groups of short fiber feeding points arranged at intervals along the length direction of the fiber transfer channel of multifilaments, wherein n is 4, each group contains 5 short fiber feeding points, the short fiber feeding points of the same group are evenly distributed around the central axis of the fiber transfer channel of internal multifilaments, and the distance between two adjacent groups of short fiber feeding points is 25 mm; [0064] the prepared pile yarn mainly consists of the multifilament and piles on the surface of the multifilament; the pile refers to the short fiber with one free end and the other end bonded to the multifilament by mutual interlacing, wrapping and/or tangling; along the length direction of multifilaments, the distribution density of the pile is 240/m; the average length of short fibers exposed from the outermost monofilament surface of the multifilament is 3 mm.

[0065] Use the prepared pile yarn as the weft yarn and 325 cotton yarn as the warp yarn, process according to the weaving process to obtain the pile fabric; the pile fabric is a plain weave with a warp density of 120 pieces/10 cm, and a weft density of 150 pieces/10 cm.

Example 2

[0066] A method for preparing a pile yarn, the specific process is as follows: [0067] in the process of uniform motion at 25 m/min of multifilaments, using a high-pressure airflow to feed short fibers into a fiber transfer channel of multifilaments to prepare the pile yarn; [0068] the multifilament is a DTY filament, the specification of the DTY filament is 100D/30F; the pressure of the high-pressure airflow is 1 MPa; the included angle between the feeding direction of short fibers and the transferring direction of multifilaments is 86; [0069] the short fiber is a cotton fiber; the total feeding amount of short fibers is 85/s; the average length of short fibers is 18 mm; [0070] the fiber transfer channel of multifilaments has a total of n groups of short fiber feeding points arranged at intervals along the length direction of the fiber transfer channel of multifilaments, wherein n is 4, each group contains 6 short fiber feeding points, the short fiber feeding points of the same group are evenly distributed around the central axis of the fiber transfer channel of internal multifilaments, and the distance between two adjacent groups of short fiber feeding points is 26 mm; [0071] the prepared pile yarn mainly consists of the multifilament and piles on the surface of the multifilament; the pile refers to the short fiber with one free end and the other end bonded to the multifilament by mutual interlacing, wrapping and/or tangling; along the length direction of multifilaments, the distribution density of the pile is 204/m; the average length of short fibers exposed from the outermost monofilament surface of the multifilament is 3.5 mm.

[0072] Use the prepared pile yarn as the weft yarn and 285 cotton yarn as the warp yarn, process according to the weaving process to obtain the pile fabric; the pile fabric is a plain weave with a warp density of 110 pieces/10 cm, and a weft density of 150 pieces/10 cm.

Example 3

[0073] A method for preparing a pile yarn, the specific process is as follows: [0074] in the process of uniform motion at 30 m/min of multifilaments, using a high-pressure airflow to feed short fibers into a fiber transfer channel of multifilaments to prepare the pile yarn; [0075] the multifilament is a DTY filament, the specification of the DTY filament is 100D/30F; the pressure of the high-pressure airflow is 1 MPa; the included angle between the feeding direction of short fibers and the transferring direction of multifilaments is 87; [0076] the short fiber is a viscose fiber; the total feeding amount of short fibers is 95/s; the average length of short fibers is 18 mm; [0077] the fiber transfer channel of multifilaments has a total of n groups of short fiber feeding points arranged at intervals along the length direction of the fiber transfer channel of multifilaments, wherein n is 4, each group contains 7 short fiber feeding points, the short fiber feeding points of the same group are evenly distributed around the central axis of the fiber transfer channel of internal multifilaments, and the distance between two adjacent groups of short fiber feeding points is 27 mm; [0078] the prepared pile yarn mainly consists of the multifilament and piles on the surface of the multifilament; the pile refers to the short fiber with one free end and the other end bonded to the multifilament by mutual interlacing, wrapping and/or tangling; along the length direction of multifilaments, the distribution density of the pile is 190/m; the average length of short fibers exposed from the outermost monofilament surface of the multifilament is 3.5 mm.

[0079] Use the prepared pile yarn as the weft yarn and 325 cotton yarn as the warp yarn, process according to the weaving process to obtain the pile fabric; the pile fabric is a plain weave with a warp density of 120 pieces/10 cm, and a weft density of 150 pieces/10 cm.

Example 4

[0080] A method for preparing a pile yarn, the specific process is as follows: [0081] in the process of uniform motion at 35 m/min of multifilaments, using a high-pressure airflow to feed short fibers into a fiber transfer channel of multifilaments to prepare the pile yarn; [0082] the multifilament is a DTY filament, the specification of the DTY filament is 100D/30F; the pressure of the high-pressure airflow is 2 MPa; the included angle between the feeding direction of short fibers and the transferring direction of multifilaments is 88; [0083] the short fiber is a polyester fiber; the total feeding amount of short fibers is 100/s; the average length of short fibers is 20 mm; [0084] the fiber transfer channel of multifilaments has a total of n groups of short fiber feeding points arranged at intervals along the length direction of the fiber transfer channel of multifilaments, wherein n is 5, each group contains 8 short fiber feeding points, the short fiber feeding points of the same group are evenly distributed around the central axis of the fiber transfer channel of internal multifilaments, and the distance between two adjacent groups of short fiber feeding points is 28 mm; [0085] the prepared pile yarn mainly consists of the multifilament and piles on the surface of the multifilament; the pile refers to the short fiber with one free end and the other end bonded to the multifilament by mutual interlacing, wrapping and/or tangling; along the length direction of multifilaments, the distribution density of the pile is 171/m; the average length of short fibers exposed from the outermost monofilament surface of the multifilament is 4 mm.

[0086] Use the prepared pile yarn as the raw material, process according to the weft knitting process to obtain a weft knitted fabric with a plain weft needle structure, that is, the pile fabric; the transverse stitch density of the fabric is 15 wales/5 cm, and the longitudinal stitch density of the fabric is 15 courses/5 cm.

Example 5

[0087] A method for preparing a pile yarn, the specific process is as follows: [0088] in the process of uniform motion at 40 m/min of multifilaments, using a high-pressure airflow to feed short fibers into a fiber transfer channel of multifilaments to prepare the pile yarn; [0089] the multifilament is a DTY filament, the specification of the DTY filament is 100D/30F; the pressure of the high-pressure airflow is 2 MPa; the included angle between the feeding direction of short fibers and the transferring direction of multifilaments is 89; [0090] the short fiber is a wool fiber; the total feeding amount of short fibers is 115/s; the average length of short fibers is 25 mm; [0091] the fiber transfer channel of multifilaments has a total of n groups of short fiber feeding points arranged at intervals along the length direction of the fiber transfer channel of multifilaments, wherein n is 5, each group contains 7 short fiber feeding points, the short fiber feeding points of the same group are evenly distributed around the central axis of the fiber transfer channel of internal multifilaments, and the distance between two adjacent groups of short fiber feeding points is 29 mm; [0092] the prepared pile yarn mainly consists of the multifilament and piles on the surface of the multifilament; the pile refers to the short fiber with one free end and the other end bonded to the multifilament by mutual interlacing, wrapping and/or tangling; along the length direction of multifilaments, the distribution density of the pile is 173/m; the average length of short fibers exposed from the outermost monofilament surface of the multifilament is 5 mm.

[0093] Use the prepared pile yarn as the raw material, process according to the weft knitting process to obtain a weft knitted fabric with a rib structure, that is, the pile fabric; the transverse stitch density of the fabric is 20 wales/5 cm, and the longitudinal stitch density of the fabric is 16 courses/5 cm.

Example 6

[0094] A method for preparing a pile yarn, the specific process is as follows: [0095] in the process of uniform motion at 40 m/min of multifilaments, using a high-pressure airflow to feed short fibers into a fiber transfer channel of multifilaments to prepare the pile yarn; [0096] the multifilament is a DTY filament, the specification of the DTY filament is 100D/30F; the pressure of the high-pressure airflow is 2 MPa; the included angle between the feeding direction of short fibers and the transferring direction of multifilaments is 90; [0097] the short fiber is a wool fiber; the total feeding amount of short fibers is 130/s; the average length of short fibers is 25 mm; [0098] the fiber transfer channel of multifilaments has a total of n groups of short fiber feeding points arranged at intervals along the length direction of the fiber transfer channel of multifilaments, wherein n is 5, each group contains 6 short fiber feeding points, the short fiber feeding points of the same group are evenly distributed around the central axis of the fiber transfer channel of internal multifilaments, and the distance between two adjacent groups of short fiber feeding points is 30 mm; [0099] the prepared pile yarn mainly consists of the multifilament and piles on the surface of the multifilament; the pile refers to the short fiber with one free end and the other end bonded to the multifilament by mutual interlacing, wrapping and/or tangling; along the length direction of multifilaments, the distribution density of the pile is 195/m; the average length of short fibers exposed from the outermost monofilament surface of the multifilament is 5 mm.

[0100] Use the prepared pile yarn as the raw material, process according to the warp knitting process to obtain a warp knitted fabric with a warp plain structure, that is, the pile fabric; the transverse stitch density of the fabric is 18 wales/5 cm, and the longitudinal stitch density of the fabric is 14 courses/5 cm.

Example 7

[0101] A method for preparing a pile yarn, basically the same as Example 1, except for that: the short fibers are not continuously fed into the fiber transfer channel of multifilaments, but are discontinuously fed into the fiber transfer channel of multifilaments; the discontinuous feeding is 1 second at 1 second interval; when feeding, the total feeding amount of short fibers is the same as that in Example 1.

[0102] The prepared pile yarn consists of non-pile segments and pile segments arranged alternately along the length direction; the non-pile segment only consists of multifilaments; the pile segment mainly consists of multifilaments and piles on the surface of the multifilament, the pile refers to the short fiber with one free end and the other end bonded to the multifilament by mutual interlacing, wrapping and/or tangling, along the length direction, the distribution density of the pile of the pile segment is 240/m; the average length of short fibers exposed from the outermost monofilament surface of the multifilament is 3 mm.

[0103] Use the prepared pile yarn as the weft yarn and 325 cotton yarn as the warp yarn, process according to the weaving process to obtain the pile fabric; the pile fabric is a plain weave with a warp density of 120 pieces/10 cm, and a weft density of 150 pieces/10 cm.

[0104] The preparation process of the pile yarn according to examples 1-7 can be realized by various devices, and the present invention only exemplarily provides a preparation device of the pile yarn, as shown in FIGS. 1-5, including a nozzle 4, a high-pressure airflow jetting device, a short fiber transferring device and a multifilament transferring device;

[0105] the short fiber transferring device is a three-roller drafting device, consisting of back, middle and front of three rollers arranged sequentially along the fiber running direction and the corresponding back, middle and front of leather rollers; the linear speed of the front roller is 8-15 m/min, the total drafting multiple of the three-roller drafting device is 5-30 times, and the quantitative amount of short fiber strips is 5-8 g/10 m; [0106] the multifilament transferring device includes a feeding roller 2 and a yarn drawing roller 3, the feeding roller 2 is located in the lower part of the inner cylindrical tube, and the yarn drawing roller 3 is located in the upper part of the inner cylindrical tube; the linear speed ratio of the feeding roller 2 to the yarn drawing roller 3 is 1.01-1.05, the linear speed of the feeding roller 2 is 20-40 m/min; [0107] the nozzle 4 is cylindrical in shape as a whole, and includes an inner cylindrical tube, an outer cylindrical tube and two annular sealing rings, the inner cylindrical tube is sleeved in the outer cylindrical tube and the two are coaxial; the top ends of the inner cylindrical tube and the outer cylindrical tube are flush and connected by an annular sealing ring, and the bottom ends are flush and connected by an annular sealing ring, wherein the portion surrounded by the outer cylindrical tube, the inner cylindrical tube and two annular sealing rings is the air cavity 6; [0108] the outer cylindrical tube is provided with a through hole I 8, a through hole II 9, and a through hole III 10, one end of through holes I, II and III intersects with the outer wall of the outer cylindrical tube, and the intersection points are respectively recorded as point a, b and c; the other end of through holes I, II and III intersects with the inner wall of the outer cylindrical tube, and the intersection points are respectively recorded as point d, e and f; through holes I, II and III are arranged in intervals from bottom to top along the height direction of the outer cylindrical tube; [0109] the inner cylindrical tube is provided with n groups of through holes IV 7, n is 4-5, each group contains 5-8 through holes IV 7, one end of each through hole IV 7 intersects with the outer wall of the inner cylindrical tube, and the intersection point is recorded as point p; the other end of each through hole IV 7 intersects with the inner wall of the inner cylindrical tube, the intersection point is recorded as point q, and point p is located below point q along the height direction of the inner cylindrical tube; the first to n-th groups of through holes IV 7 are arranged in intervals from bottom to top along the height direction of the inner cylindrical tube; the angle between the central axis of each through hole IV 7 and the central axis of the inner cylindrical tube is 85-90; [0110] the through hole I 8 serves as the fiber transfer channel of short fibers, the short fiber transferring device is located on the side of the through hole I 8 and is used to transfer short fibers to the through hole I 8; the hollow portion of the inner cylindrical tube serves as the fiber transfer channel of multifilaments 5, with its bottom end being an inlet and its top end being an outlet, and the multifilament transferring device is used to transfer multifilaments to the hollow portion of the inner cylindrical tube, and the number of monofilaments in the multifilaments 1 is 30-50; [0111] the central axes of through hole I 8 and through hole II 9 are parallel to each other, and do not intersect with the central axis of the outer cylindrical tube; there is a point g on the central axis of the outer cylindrical tube, the line connecting point a and point d and the line connecting point a and point g are located on the same plane perpendicular to the central axis of the outer cylindrical tube and form an angle of 5-10; [0112] the number of through holes III 10 is the same as the number of through holes IV 7 in the n-th group of through holes IV 7, each through hole III 10 corresponds to each through hole IV 7 in the n-th group of through holes IV 7 one by one, and the central axes coincide with each other; the same group of through holes IV 7 are evenly distributed around the central axis of the inner cylindrical tube; [0113] the inner radius of the outer cylindrical tube is 2.5-4 L, the wall thickness is 1.2-2 L, the height is 4-6 L, and L is the average length of the short fibers; wherein through hole I 8, through hole II 9, and through hole III 10 are all circular through holes, the diameter of through hole I 8 is 3-5 mm, the diameter of through hole II 9 is 3-5 mm, and the diameter of through hole III 10 is 1-3 mm; wherein the distances between the centers of point d, point e, and point f and the bottom end of the outer cylindrical tube are respectively 6-10 mm, 46-50 mm, and 86-106 mm; [0114] the inner diameter of the inner cylindrical tube is 0.2-0.5 L, and the wall thickness is 1.2-2 L; n groups of through holes IV 7 are all circular through holes, and the diameters are all 1-2 mm; the distance between the centers of two adjacent groups of through holes IV 7 in the first to n-th groups of through holes IV is 25-30 mm, and the distance between the center of the first group of through holes IV 7 and the bottom end of the inner cylindrical tube is 10-15 mm; [0115] the first group of through holes IV 7 are located above through holes I 8 along the height direction of the inner cylindrical tube and the outer cylindrical tube; [0116] the inlet of through hole I 8 (i.e. point a), the inlet of through hole II 9 (i.e. point b) and the inlet of through hole III 10 (i.e. point c) are all connected to the high-pressure airflow jetting device, the high-pressure airflow jetting device respectively provides airflows of 1-2 MPa, 0.5-0.8 MPa, and 0.2-0.3 MPa to through hole I 8, through hole II 9, and through hole III 10; the pressure of the high-pressure airflow and the size of the nozzle 4 cooperate with each other so that the pressure in through holes IV 7 is 1-2 MPa.

[0117] Taking Example 1 as an example, how to use the device to process a pile yarn is illustrated: [0118] The parameters of the device of the present invention are set as follows: the linear speed of the front roller is 15 m/min, the total drafting multiple of the three-roller drafting device is 10 times, and the quantitative amount of short fiber strips is 8 g/10 m; the linear speed ratio of the feeding roller 2 to the yarn drawing roller 3 is 1.01, the linear speed of the feeding roller 2 is 20 m/min; n is 4, each group contains 5 through holes IV 7; the angle between the central axis of each through hole IV 7 and the central axis of the inner cylindrical tube is 85; the line connecting point a and point d and the line connecting point a and point g are located on the same plane perpendicular to the central axis of the outer cylindrical tube and form an angle of 5; [0119] the inner radius of the outer cylindrical tube is 2.5 L, the wall thickness is 2 L, the height is 6 L, and L is the average length of the short fibers, which is 15 mm; wherein through hole I 8, through hole II 9, and through hole III 10 are all circular through holes, the diameter of through hole I 8 is 5 mm, the diameter of through hole II 9 is 5 mm, and the diameter of through hole III 10 is 3 mm; wherein the distances between the centers of point d, point e, and point f and the bottom end of the outer cylindrical tube are respectively 10 mm, 50 mm, and 106 mm; [0120] the inner diameter of the inner cylindrical tube is 0.5 L, and the wall thickness is 2 L; n groups of through holes IV 7 are all circular through holes, and the diameters are all 2 mm; the distance between the centers of two adjacent groups of through holes IV 7 in the first to n-th groups of through holes IV is 25 mm, and the distance between the center of the first group of through holes IV 7 and the bottom end of the inner cylindrical tube is 12 mm; the inlet of through hole I 8 (i.e. point a), the inlet of through hole II 9 (i.e. point b) and the inlet of through hole III 10 (i.e. point c) are all connected to the high-pressure airflow jetting device, the high-pressure airflow jetting device respectively provides airflows of 2 MPa, 0.8 MPa, and 0.3 MPa to through hole I 8, through hole II 9, and through hole III 10; the pressure of the high-pressure airflow and the size of the nozzle 4 cooperate with each other so that the pressure in through holes IV 7 is 1 MPa; [0121] The preparation process of the pile yarn is as follows: use the multifilament transferring device to transfer multifilaments to the hollow portion of the inner cylindrical tube (that is, the fiber transfer channel of multifilaments 5), use the short fiber transferring device to transfer short fibers to the through hole I 8, and use the high-pressure airflow provided by the high-pressure airflow jetting device to continuously feed short fibers into the fiber transfer channel of multifilaments 5 to prepare the pile yarn; [0122] wherein the multifilament is a DTY filament, the specification of the DTY filament is 100D/30F; [0123] the short fiber is a cotton fiber; the total feeding amount of short fibers feeding into the fiber transfer channel of multifilaments 5 is 80/s.

[0124] The prepared pile yarn mainly consists of the multifilament and piles on the surface of the multifilament; the pile refers to the short fiber with one free end and the other end bonded to the multifilament by mutual interlacing, wrapping and/or tangling; along the length direction of multifilaments, the distribution density of the pile is 240/m; the average length of short fibers exposed from the outermost monofilament surface of the multifilament is 3 mm.