A kind of short fiber / short fiber wrapped yarn with bio-based chinlon 56 short fiber as core yarn and its preparation method

Abstract

The application discloses a kind of short fiber / short fiber wrapped yarns with bio-based chinlon 56 short fiber as core yarn and a preparation method thereof. Without equipment modification on ordinary ring spinning frame, through spinning process design and fiber raw material selection, stable production of short fiber / short fiber wrapped yarns is realized. The application has the advantages of strong suitability of roving varieties, simple method, high short fiber wrapping rate and stable wrapping effect, and can provide new solutions for the preparation of short fiber / short fiber wrapped yarns of multiple fiber varieties and multifunctional yarns.

Description

Technical Field

[0001] This invention relates to the field of spinning technology, and in particular to a Sirospun spinning technology, specifically to a short fiber / short fiber wrapped yarn with bio-based nylon 56 short fiber as the core yarn and its preparation method. Background Technology

[0002] Wrapped yarn is a special composite yarn with a core-sheath structure. Its yarn raw materials have complementary advantages and excellent overall performance, largely meeting the demand for high-performance yarns. Since its inception, it has attracted the attention of many scholars. Based on the different fiber raw materials used in the core-sheath layer, it can generally be divided into three categories: staple fiber / filament wrapped yarn, staple fiber / staple fiber wrapped yarn, and filament / filament wrapped yarn. Currently, research on staple fiber / filament and filament / filament wrapped yarn technologies is relatively mature. However, research on staple fiber / staple fiber wrapped yarn is limited due to factors such as spinning tension and splicing difficulties.

[0003] Short fiber / short fiber wrapped yarn is a yarn whose core and outer layers are both composed of short fibers. This new type of yarn only began to attract attention in the 1990s. Because the inner and outer layers of the composite yarn have different fiber types, and the fibers are wrapped together in a bundled fiber form, short fiber / short fiber wrapped yarn is completely different from ordinary fiber blended yarn in terms of performance, offering several advantages in use. Currently, the methods for producing short fiber wrapped yarn mainly focus on the modification of roving frames and spinning frames. A Chinese journal article, "Production Practice of Combed Cotton / Vinylene Wrapped Yarn," discloses an integrated yarn-forming technology that modifies the roving frame by adding a cotton support plate at the front nip. By precisely adjusting the height and tilt angle of the cotton support plate, the outer fibers of the vinylon and cotton slivers are wrapped around the inner layer and twisted into yarn after being drafted by the roving. Chinese patent CN101126188A discloses an apparatus and method for spinning wrapped yarn. A roller rubber roller with circumferential grooves is mounted on the front roller, and the advance roller and advance rubber roller are modified into an advance nip. This special device, added to the spinning frame, successfully spins short fiber / short fiber interwoven yarn. The above examples show that although progress has been made in the production equipment and spinning process of wrapped yarn, some problems still need to be solved. The stability of the core fiber quantity and the wrapping stability of the core-spun roving during the spinning process need to be improved; especially in the preparation of short fiber / short fiber wrapped yarn, parallel fibers exiting from the front roller nip are subject to unexpected drafting due to differences in spinning tension, resulting in large changes in the quantity of inner and outer fiber layers. Therefore, controlling the yarn tension is of great significance for improving the wrapping effect. Summary of the Invention

[0004] To address the tension and splice control issues in existing short fiber / short fiber wrapped yarns, this invention provides a ring-spun short fiber / short fiber composite yarn with bio-based nylon (PA) 56 short fiber as the core yarn and its preparation method. Utilizing a conventional ring spinning machine, stable production of short fiber / short fiber wrapped yarn is achieved through spinning process design and fiber raw material selection. Specifically, this includes designing the position of the roving feed, the roving feed spacing, the length of the feed fiber, and the elongation of the feed fiber, thereby controlling tension changes and the twisting triangle morphology during spinning, resulting in a high-coverage short fiber / short fiber wrapped yarn with abrasion resistance.

[0005] A method for preparing Sirospun staple fiber / staple fiber wrapped yarn with bio-based nylon 56 staple fiber as the core yarn, such as... Figure 1 As shown, roving A and roving B are fed into a conventional ring spinning machine. Roving A is located at the center of the spindle at the front nip, and roving B is located to the left of roving A. The distance between roving A and roving B is S. Roving A is bio-based nylon 56 staple fiber (fiber A), and roving B is chemical fiber or natural fiber staple fiber (fiber B).

[0006] Furthermore, the length of the fed roving A fiber is 38mm-51mm, and the fineness is 1.4-2.0dtex; the length of the fed roving B fiber is 20-30mm, and the fineness is 1.1-2.0dtex; the breaking strength of fiber A is 1.2-3 times that of fiber B, and the breaking elongation of fiber A is 4-10 times that of fiber B.

[0007] Furthermore, the distance S between roving A and roving B is 2-5 mm.

[0008] Furthermore, roving A has a tex of 260-450 tex and a twist coefficient of 64-70, while roving B has a tex of 260-350 tex and a twist coefficient of 90-110.

[0009] Furthermore, the roller spacing of a typical ring spinning machine is: front zone × back zone, (40-55)mm × (45-70)mm; the yarn twist coefficient is 400-470.

[0010] Furthermore, in the composite yarn, nylon fiber A (bio-based nylon 56 staple fiber) is located in the yarn core, possessing twist and twist direction, while fiber B is located in the surface layer, also possessing twist and twist direction. The roving and yarn have the same twist direction, which is Z-twist.

[0011] Furthermore, fiber B is a short fiber of natural fibers such as cotton, kapok, linen, and wool, or a short fiber of chemical fibers such as polyester, vinylon, polypropylene, and nylon (e.g., bio-based nylon 56).

[0012] The present invention also provides a short fiber / short fiber wrapped yarn with bio-based nylon 56 short fiber as the core yarn prepared by the above method. The bio-based nylon 56 short fiber is located in the yarn core and is wrapped by chemical fiber or natural fiber short fiber. The coverage of bio-based nylon 56 short fiber (fiber A) is large, ranging from 50% to 90%.

[0013] The beneficial effects of this invention are:

[0014] 1. No equipment modification is required on a conventional ring spinning machine. By designing the position of the roving feed, the roving feed spacing, the length of the feed fiber, and the elongation of the feed fiber, spinning tension can be controlled to produce staple fiber / short fiber wrapped yarn. Spinning tension control is convenient, the roving variety is highly applicable, the method is simple, and various staple fiber / short fiber wrapped yarns can be produced.

[0015] 2. Nylon fiber has good abrasion resistance and high strength. Nylon yarn has serious fuzziness. Nylon / cotton, round cross-section / five-leaf cross-section nylon staple fiber / staple fiber wrapped yarn can solve the problems of fuzziness and pilling in nylon fabrics, while giving the fabric high abrasion resistance.

[0016] 3. Short fiber / short fiber wrapped yarn has a stable coating effect, providing a new solution for the preparation of high-performance, multi-functional yarns. Attached Figure Description

[0017] Figure 1 This is a diagram of the roving feeding of the present invention; where S is the roving feeding gap, A represents the core roving, and B represents the surface roving.

[0018] Figure 2 The image shows a cross-sectional SEM image of the wrapped yarn prepared in Example 1 of this invention; where A represents PA56 short fiber and B represents cotton fiber.

[0019] Figure 3 The image shows the appearance of the wrapped yarn prepared in Example 1 of this invention; where A represents PA56 short fiber and B represents cotton fiber.

[0020] Figure 4 This is a SEM image of the cross-section of the wrapped yarn prepared in Example 2 of the present invention.

[0021] Figure 5 The image shows the friction effect of the wrapped yarn prepared in Example 3 of the present invention; where 5-1 is the initial friction state and 5-2 is the state of the yarn after 300 friction cycles.

[0022] Figure 6 This is a SEM image of the cross-section of the wrapped yarn prepared in Example 3 of the present invention. Detailed Implementation

[0023] The following non-limiting embodiments are intended to enable those skilled in the art to more fully understand the invention, but do not limit the invention in any way.

[0024] The following embodiments of the present invention describe the testing methods and equipment.

[0025] The following fiber materials are selected in the embodiments of the present invention:

[0026] PA56 short fiber, round shape, 38mm in length, fineness 1.67dtex; elongation at break 81.1%, breaking strength 3.53cN / dtex -1 .

[0027] PA56 short fiber, five-lobed type, 38mm long, fineness 3.0dtex; elongation at break 46.4%, tensile strength 3.59cN / dtex -1 .

[0028] The cotton fiber is 28 mm long and 1.21 dtex fine; its breaking elongation is 11.5% and its breaking strength is 2.74 cN / dtex. -1 .

[0029] The YG061 electronic single yarn strength tester (Laizhou Electronic Instruments Co., Ltd.) is used to measure the breaking strength and elongation at break of yarn, in accordance with the measurement standard GB / T 3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles".

[0030] The LFY-109 computerized yarn abrasion tester (Shandong Textile Science Research Institute) is used to test the abrasion resistance of yarn, and the measurement standard is FZ / T 01058-1999 "Test Method for Yarn Abrasion Resistance - Reciprocating Roller Method".

[0031] DSSp-01 Digital Sample Yarn Testing Machine (Tianjin Jiacheng Electromechanical Equipment Co., Ltd.)

[0032] The JSM-7800F field emission scanning electron microscope (Nippon Electron Ltd.) is used to observe the cross-section of yarn.

[0033] Example 1

[0034] In this embodiment, roving A (PA56 staple fiber round shape, 38mm) and roving B (cotton, 28mm) are fed into a spinning machine to prepare staple fiber / short fiber wrapped yarn. The basis weight of roving A is 2.6g / 10m and the twist coefficient is 64; the basis weight of roving B is 5.0g / 10m and the twist coefficient is 90.

[0035] The spinning process has the following parameters: the feed spacing between roving A and roving B is 2mm, the yarn draft ratio is 26.3, the roller spacing is: front zone × back zone, 40mm × 50mm, the yarn twist coefficient is 420, the ring is PG 2, the traveler is 6903-6#, the twist shrinkage is 4.2%, and the spindle speed is 12000r / min.

[0036] The properties of the resulting wrapped yarn are as follows: the tensile strength is 22.5 cN / tex.

[0037] The cross-section of the resulting wrapped yarn is as follows Figure 2 As shown, the circular cross-section PA56 fibers are distributed within the yarn cross-section, almost entirely covered by the elliptical cross-section cotton fibers. The resulting wrapped yarn appears as follows. Figure 3 As shown, the white PA56 fiber A is basically covered by the black cotton fiber B, with only a few PA56 fibers showing, indicating that the process has basically achieved a stable coverage of about 90%.

[0038] Example 2

[0039] In this embodiment, roving A (PA56 staple fiber circular shape, 38mm) and roving B (PA56 staple fiber five-leaf shape, 38mm) are fed into a spinning machine to prepare staple fiber / short fiber wrapped yarn. The basis weight of roving A is 2.2g / 10m and the twist coefficient is 64; the basis weight of roving B is 4.4g / 10m and the twist coefficient is 90.

[0040] The spinning process has the following parameters: the feed spacing between roving A and roving B is 4mm, the yarn draft ratio is 17.8, the roller spacing is: front zone × back zone, 40mm × 50mm, the yarn twist coefficient is 400, the ring is PG 2, the traveler is 6903-6#, the twist shrinkage is 4.9%, and the spindle speed is 12000r / min.

[0041] The resulting wrapped yarn exhibits the following properties: an actual fineness of 37.3 tex and a breaking strength of 21.02 cN / tex. Under a 20g weight, the yarn achieved an average of 274.6 abrasion cycles, demonstrating good abrasion resistance. The cross-section of the resulting wrapped yarn is shown below. Figure 4 As shown, it can be seen that, calculated based on the circumference ratio of the circular fiber region to the pentagonal fiber, the coverage rate is approximately 52%, indicating that the pentagonal fiber has a certain wrapping effect on the circular fiber.

[0042] Example 3

[0043] In this embodiment, roving A (PA56 staple fiber, round shape, 38mm) and roving B (PA56 staple fiber, five-lobed shape, 38mm) are fed into the spinning frame. Roving A has a basis weight of 2.2g / 10m and a twist coefficient of 64; roving B has a basis weight of 6.6g / 10m and a twist coefficient of 90.

[0044] The spinning process has the following parameters: the feed spacing between roving A and roving B is 4mm, the yarn draft ratio is 20.6, the roller spacing is: front zone × back zone, 40mm × 50mm, the yarn twist coefficient is 400, the ring is PG 2, the traveler is 6903-6#, the twist shrinkage is 4.1%, and the spindle speed is 12000r / min.

[0045] The resulting wrapped yarn exhibits an actual fineness of 42.6 tex and a breaking strength of 23.75 cN / tex. Under a 20g weight, the yarn achieved an average of 387.1 abrasion cycles, demonstrating excellent abrasion resistance. Figure 5 As shown, after 300 cycles of friction, only 30% of the yarn broke, with most yarn retaining a certain strength. The cross-section of the resulting wrapped yarn is shown below. Figure 6 As shown, the coverage rate of the circular fibers is approximately 73%.

Claims

1. A method for preparing a staple fiber / staple fiber wrapped yarn with bio-based nylon 56 staple fiber as the core yarn, characterized in that: Rovings A and B are fed into a conventional ring spinning machine that does not require equipment modification. Roving A is located at the center of the spindle at the front nip, and roving B is located to the left of roving A. The distance between rovings A and roving B is S. Roving A is bio-based nylon 56 staple fiber, and roving B is chemical fiber or natural fiber staple fiber. The length of the roving A fiber fed in is 38mm-51mm, and the fineness is 1.4-2.0dtex; the length of the roving B fiber fed in is 20-30mm, and the fineness is 1.1-2.0dtex; the breaking strength of the roving A fiber is 1.2-3 times that of the roving B fiber, and the breaking elongation of the roving A fiber is 4-10 times that of the roving B fiber; The distance S between roving A and roving B is 2-5 mm; Roving A has a tex count of 200-350 tex and a twist coefficient of 64-70; roving B has a tex count of 260-700 tex and a twist coefficient of 90-110.

2. The preparation method according to claim 1, characterized in that: The roller spacing of a typical ring spinning machine is: front zone × back zone, (40-55) mm × (45-70) mm; the yarn twist coefficient is 400-470; the twist direction of the roving and the yarn is the same, which is Z twist.

3. The preparation method according to claim 1, characterized in that, Natural fiber staple fibers are cotton, linen, or wool staple fibers, while chemical fiber staple fibers are polyester, vinylon, or polypropylene staple fibers.

4. The staple fiber / staple fiber wrapped yarn prepared by the method according to any one of claims 1-3, with bio-based nylon 56 staple fiber as the core yarn.

5. The staple fiber / staple fiber wrapped yarn according to claim 4, characterized in that, Bio-based nylon 56 staple fiber is located in the yarn core and is wrapped by chemical or natural fiber staple fibers.

6. The staple fiber / staple fiber wrapped yarn according to claim 4 or 5, characterized in that, The coverage rate of bio-based nylon 56 staple fiber is 50-90%.

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