A biaxial sheath-core structured brittle filament covered yarn and a one-step preparation method thereof

Abstract

The present invention proposes a double-axis sheath-core structured brittle-breaking filament covered yarn and a one-step preparation method thereof, belonging to the technical field of wrapped composite yarns. The covered yarn of the present invention comprises a double-core shaft system and a soft yarn wrapped on the double-core shaft system, the double-core shaft system comprises a first core shaft and a second core shaft, the first core shaft is formed by soft yarn covering brittle-breaking filaments, and the second core shaft is brittle-breaking filaments. The present invention can effectively protect and prevent brittle-breaking fiber filaments from being damaged during processing and use by regulating the feeding sequence and key process parameters of brittle-breaking filaments and soft yarns, thereby obtaining a wrapped and protective brittle-breaking filament-based covered yarn.

Description

Technical Field

[0001] The invention belongs to the technical field of wrapped composite yarns, and in particular relates to a biaxial sheath-core structured brittle-break filament covered yarn and a one-step preparation method thereof. Background Art

[0002] High-performance fibers are widely used in the industry due to their excellent mechanical properties. However, brittle carbon filaments and similar fibers, such as glass fiber and basalt fiber, are prone to bending, breaking, or fibrillation during processing and use, which limits their use and processing. Therefore, the need for effective protective measures (such as wrapping carbon fibers within the yarn body through spinning technology) to protect these fibers during processing and subsequent use is a technical difficulty that needs to be addressed in this field.

[0003] Currently, the spinning of the above-mentioned high-performance fibers is mostly short-staple fiber blends: for example, patent application number 200710041772.X proposes an aramid fiber blended yarn and a processing method thereof, which is spun by mixing raw materials, making sliver, drawing, and air-jet spinning; patent application number 201010131593.7 proposes an aramid fiber and carbon fiber blended yarn and a production method thereof, which is spun by mixing aramid fiber and carbon fiber in a 1:1 ratio. This shows that the current spinning of high-performance fibers is mostly short-staple fiber blends.

[0004] In addition, in recent years, there have been reports on a series of patented technologies for spinning using high-performance fiber filaments: for example, patent application number 201110242861.7 proposes a composite spinning device and spinning method for chemical fiber filaments coated with rigid fiber filaments. Based on the ring spinning machine, the rigid fiber filaments are sequentially passed through the unwinding roller and the positioning yarn guide, and then the two bundles of chemical fiber filaments unwound from the chemical fiber filament tube, fed into the front roller pair through the tension disk and the multi-position yarn guide, and then output from the front roller pair are converged at the convergence point. At the same time, under the rotation of the spindle of the ring spinning machine, the chemical fiber filaments are The filaments and rigid fiber filaments are twisted at the convergence point to form a composite yarn; the patent application number 201110242862.1 relates to a spinning method and a spinning device in which a short fiber bundle symmetrically covers the rigid fiber filament. Based on a ring spinning machine, the rigid fiber filaments on the filament tube are fed to the unwinding roller via a yarn guide, enter the slot of the slotted roller and are output along the slot. The two symmetrical short fiber bundles fed to the front roller pair via the rear roller pair and the middle roller pair and output by the front roller pair converge at the convergence point, and are twisted to form a composite yarn in which the short fiber bundles are coated on the outside of the rigid fiber filaments. It can be seen that the existing technology of using high-performance fiber filaments for spinning is based on the ring spinning system.

[0005] Up to now, there are few reports on biaxial sheath-core structured brittle-break filament covered yarn based on a hollow spindle wrapped spinning system and its preparation method at home and abroad. Therefore, the present invention proposes a biaxial sheath-core structured brittle-break filament covered yarn and its one-step preparation method. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention proposes a biaxial sheath-core structured brittle-break filament covered yarn and a one-step preparation method thereof. The spinning process is suitable for the smooth and unbending yarn formation of brittle-break fiber filaments, which can solve the technical difficulties currently faced by brittle-break fiber filaments during spinning.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] One of the technical solutions of the present invention:

[0009] A double-axis sheath-core structured brittle filament covered yarn comprises a double-core shaft system and a soft yarn wrapped around the double-core shaft system. The double-core shaft system comprises a first core shaft and a second core shaft. The first core shaft is formed by soft yarn covering a first brittle filament, and the second core shaft is a second brittle filament.

[0010] Furthermore, the soft yarn wrapped around the dual-core system is wrapped in a direction opposite to the direction in which the soft yarn in the first core is wrapped. Compared to wrapping in the same direction, this reversed arrangement results in a stable layered cross-wrapped structure. Furthermore, cross-wrapping significantly reduces the residual torque of the final spun covered yarn, resulting in a well-balanced twist in the covered yarn. The soft yarn wrapped around the dual-core system can be the same as or different from the soft yarn in the first core.

[0011] Furthermore, the brittle filaments include one or more of carbon fiber filaments, glass fiber filaments and basalt fiber filaments.

[0012] Furthermore, the soft yarn includes one or more blended yarns selected from the group consisting of cotton yarn, polyester spun yarn, wool yarn, silk yarn and viscose spun yarn.

[0013] The second technical solution of the present invention:

[0014] A method for preparing the biaxial sheath-core structured brittle filament covered yarn is prepared in a one-step process, comprising the following steps:

[0015] Feeding a first brittle filament through a first tension control disk into the hollow tube of the lower hollow spindle of the hollow spindle wrapping spinning machine, unwinding the lower soft yarn wound on the lower hollow spindle and wrapping it around the surface of the first brittle filament to form a first core shaft;

[0016] The second brittle filament passes through the second tension control disk and then passes through the center tube adjacent to the center tube of the lower hollow ingot, and then is fed together with the first mandrel into the center tube of the upper hollow ingot corresponding to the center tube of the lower hollow ingot to form a dual-mandrel system;

[0017] The upper soft yarn wound on the upper hollow spindle is unwound and covered on the surface of the double-core shaft system to obtain the double-core skin-structured brittle filament covered yarn.

[0018] Furthermore, the spindle speed of the spinning machine is 5000r / min-8000r / min.

[0019] Furthermore, the soft yarn is unwound and wrapped on the surface of the brittle filament with a wrapping density of 400 T / m-950 T / m.

[0020] Furthermore, when the soft yarn wound on the upper hollow spindle is unwound and covered on the surface of the double-core shaft system, the covering (second covering) density is 500 T / m-1500 T / m.

[0021] The linear density of the covering can be precisely adjusted according to the final use and requirements of the yarn product.

[0022] The third technical solution of the present invention:

[0023] The biaxial sheath-core structured brittle filament covered yarn is used in the preparation of special protective clothing and technical textiles.

[0024] Compared with the prior art, the present invention has the following advantages and technical effects:

[0025] (1) The process for producing a biaxial sheath-core structured brittle-break filament covered yarn proposed in the present invention is suitable for producing brittle-break filaments smoothly and without bending, and does not require disassembling or assembling original parts on an existing hollow spindle wrapping spinning machine. By implementing innovations from the perspectives of spinning raw material screening and yarn structure control, biaxial sheath-core structured brittle-break filament covered yarn can be successfully spun. The preparation method is simple, practical, and convenient for industrial mass production.

[0026] (2) The present invention can effectively protect and prevent the damage of brittle fiber filaments during processing and use by regulating the feeding timing and key process parameters of brittle filaments and soft yarns, thereby obtaining a wrapped and protective brittle filament-based coated yarn;

[0027] (3) The method of the present invention can arbitrarily select soft yarns for textile use to carry out biaxial sheath-core structure wrapped protective spinning to adapt to the enhancement of civilian comfort and the maintenance of high-strength characteristics for technical use, and the obtained covered yarn is suitable for special protective clothing and technical textiles for industrial use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0029] Figure 1 Schematic diagram of the process principle of a biaxial sheath-core structured brittle-break filament covered yarn according to Example 1 of the present invention, wherein: 1-first brittle-break filament; 2-second brittle-break filament; 31-first tension control disk; 32-second tension control disk; 40-lower hollow spindle; 41-center tube of lower hollow spindle; 51-center tube; 60-upper hollow spindle; 61-center tube of upper hollow spindle; 7-lower soft yarn; 8-first core shaft; 9-upper soft yarn; 10-biaxial sheath-core structured brittle-break filament covered yarn;

[0030] Figure 2 Schematic diagram of the yarn forming structure of the biaxial sheath-core structured brittle-break filament covered yarn prepared in Example 1 of the present invention;

[0031] Figure 3 This is a physical appearance diagram of the biaxial sheath-core structured brittle filament covered yarn prepared in Example 1 of the present invention;

[0032] Figure 4 This is a schematic diagram of the process principle of the biaxial skin-core structured brittle-break filament covered yarn of Example 2 of the present invention, wherein: 1-first brittle-break filament; 2′-second brittle-break filament; 31-first tension control disk; 32′-second tension control disk; 40-lower hollow spindle; 41-center tube of lower hollow spindle; 51′-center tube; 60-upper hollow spindle; 61-center tube of upper hollow spindle; 7′-lower soft yarn; 8-first core shaft; 9′-upper soft yarn; 10′-biaxial skin-core structured brittle-break filament covered yarn. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0034] It should be understood that the terms described herein are intended only to describe particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges herein, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any intermediate value within a stated value or stated range and any other stated value or intermediate value within the stated range is also encompassed by the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0035] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of any conflict with any incorporated document, the contents of this specification shall prevail.

[0036] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from the description of the invention. The description and examples are intended to be illustrative only.

[0037] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0038] The technical solution of the present invention is further illustrated by the following examples.

[0039] Example 1

[0040] The schematic diagram of the process principle of the biaxial sheath-core structured brittle filament covered yarn of Example 1 of the present invention is shown in FIG. Figure 1 Among them, 1-first brittle filament; 2-second brittle filament; 31-first tension control disk; 32-second tension control disk; 40-lower hollow spindle; 41-center tube of lower hollow spindle; 51-center tube; 60-upper hollow spindle; 61-center tube of upper hollow spindle; 7-lower soft yarn; 8-first core shaft; 9-upper soft yarn; 10-double-axis skin-core structure brittle filament covered yarn.

[0041] A first brittle filament (glass fiber bundle filament) 1 is fed into the lower hollow spindle hollow tube 41 of the hollow spindle wrapping spinning machine through a first tension control disk 31. The lower soft yarn (purple pure cotton yarn) 7 wound on the lower hollow spindle 40 is unwound and wrapped around the surface of the first brittle filament (glass fiber bundle filament) 1 to form a first core shaft 8.

[0042] The second brittle filament (glass fiber bundle filament) 2 passes through the second tension control disk 32 and then passes through the center tube 51 adjacent to the center tube 41 of the lower hollow ingot. Then, it is fed together with the first mandrel 8 into the center tube 61 of the upper hollow ingot corresponding to the center tube 41 of the lower hollow ingot, forming a dual-mandrel system.

[0043] The upper soft yarn (pure polyester yarn) 9 wound on the upper hollow spindle 60 is unwound and coated on the surface of the double-core shaft system to obtain a double-core sheath structured brittle filament coated yarn 10.

[0044] It should be noted that in Example 1, the second brittle filament 2 is fed obliquely from the lower right side to the upper left side, and converges with the first core shaft 8 to form a dual-core shaft system, which is called left oblique.

[0045] The spinning process parameters for spinning biaxial sheath-core structured brittle filament covered yarn are shown in Table 1.

[0046] The yarn forming structure diagram of the biaxial sheath-core structured brittle-break filament covered yarn prepared in Example 1 of the present invention is shown in FIG. Figure 2 , see the actual appearance diagram Figure 3 .

[0047] Example 2

[0048] In the spinning process of this embodiment, the second brittle filament 2' is fed obliquely from the lower left side to the upper right side, and after converging with the first mandrel 8, a dual-mandrel system is formed, which is called right oblique. For a clearer description of this embodiment, some parts are renumbered in this embodiment.

[0049] The schematic diagram of the process principle of the biaxial sheath-core structured brittle-break filament covered yarn of Example 2 of the present invention is shown in FIG. Figure 4 , among which, 1-first brittle filament; 2′-second brittle filament; 31-first tension control disk; 32′-second tension control disk; 40-lower hollow spindle; 41-center tube of lower hollow spindle; 51′-center tube; 60-upper hollow spindle; 61-center tube of upper hollow spindle; 7′-lower soft yarn; 8-first core shaft; 9′-upper soft yarn; 10′-double-axis skin-core structure brittle filament covered yarn.

[0050] A first brittle filament (carbon fiber bundle filament) 1 is fed into the lower hollow spindle hollow tube 41 of the hollow spindle wrapping spinning machine through a first tension control disk 31. The lower soft yarn (pure polyester yarn) 7 wound on the lower hollow spindle 40 is unwound and wrapped around the surface of the first brittle filament (carbon fiber bundle filament) 1 to form a first core shaft 8.

[0051] The second brittle filament (carbon fiber bundle filament) 2′ passes through the second tension control disk 32′ and then passes through the center tube 51 adjacent to the center tube 41 of the lower hollow ingot. Then, it is fed together with the first mandrel 8 into the center tube 61 of the upper hollow ingot corresponding to the center tube 41 of the lower hollow ingot, forming a dual-mandrel system.

[0052] The upper soft yarn (polyester / cotton blended yarn) 9 wound on the upper hollow spindle 60 is unwound and coated on the surface of the double-core system to obtain a double-core sheath structured brittle filament coated yarn 10.

[0053] The spinning process parameters for spinning biaxial sheath-core structured brittle filament covered yarn are shown in Table 1.

[0054] A fabric was woven using 29.5tex 65 / 35 polyester-cotton blended yarn as the warp and the biaxial sheath-core, brittle filament covered yarn prepared in this example as the weft, in a two-up, two-down right-hand twill weave with a warp and weft density of 40 strands / inch x 40 strands / inch. The resulting fabric achieved an electromagnetic shielding effectiveness of 28.5dB within the 8.2-12.4GHz frequency range. The fabric's antistatic properties were tested using GB / T 12703-2010, "Evaluation of Electrostatic Properties of Textiles - Part 1: Electrostatic Voltage Half-Life." The fabric was cut to 45mm x 45mm, discharged at a voltage of 10kV, and rotated at a speed of 1500r / min. The half-life was 11.2s, indicating reasonable antistatic properties.

[0055] Example 3

[0056] The hollow spindle wrapped spinning machine equipment used is the same as that in Example 1 and is prepared according to the following method:

[0057] A first brittle filament (basalt fiber bundle filament) is fed into the hollow tube of the lower hollow spindle of the hollow spindle wrapping spinning machine through a first tension control disk, and the lower soft yarn (pure polyester yarn) wound on the lower hollow spindle is unwound and wrapped around the surface of the first brittle filament (basalt fiber bundle filament) to form a first core shaft;

[0058] The second brittle filament (basalt fiber bundle filament) passes through the second tension control disk and then passes through the center tube adjacent to the center tube of the lower hollow ingot. Then, it is fed together with the first mandrel into the center tube of the upper hollow ingot corresponding to the center tube of the lower hollow ingot to form a dual-mandrel system.

[0059] The upper soft yarn (wool / viscose blended yarn) wound on the upper hollow spindle is unwound and coated on the surface of the double-core system to obtain a double-core sheath structured brittle filament coated yarn.

[0060] The spinning process parameters for spinning biaxial sheath-core structured brittle filament covered yarn are shown in Table 1.

[0061] Example 4

[0062] The hollow spindle wrapped spinning machine equipment used is the same as that in Example 1 and is prepared according to the following method:

[0063] A first brittle-breaking filament (carbon fiber bundle filament) is fed into the hollow tube of the lower hollow spindle of the hollow spindle wrapping spinning machine through a first tension control disk, and the lower soft yarn (pure polyester yarn) wound on the lower hollow spindle is unwound and wrapped around the surface of the first brittle-breaking filament (carbon fiber bundle filament) to form a first core shaft;

[0064] The other second brittle filament (carbon fiber bundle filament) passes through the second tension control disk and then passes through the center tube adjacent to the center tube of the lower hollow ingot, and then is fed together with the first mandrel into the center tube of the upper hollow ingot corresponding to the center tube of the lower hollow ingot to form a dual-mandrel system;

[0065] The upper soft yarn (pure silk yarn) wound on the upper hollow spindle is unwound and coated on the surface of the double-core system to obtain a double-core sheath-structured brittle filament coated yarn.

[0066] The spinning process parameters for spinning biaxial sheath-core structured brittle filament covered yarn are shown in Table 1.

[0067] The fabric was woven using pure polyester yarn 16.4tex as the warp yarn and the biaxial sheath-core structured brittle filament covered yarn prepared in this embodiment as the weft yarn, with a one-up three-down right twill weave and a warp and weft density of 40 strands / inch x 50 strands / inch. The electromagnetic shielding effectiveness of the prepared fabric reached 33.6dB in the 8.2-12.4GHz frequency band. The antistatic performance of the fabric was tested using GB / T12703-2010 "Evaluation of Electrostatic Properties of Textiles Part 1: Half-Life of Static Voltage". The cutting size was 45mm x 45mm, the discharge voltage was 10kV, and the rotation speed was 1500r / min. The obtained half-life was 6.8s, indicating that it has good antistatic properties.

[0068] Example 5

[0069] The hollow spindle wrapped spinning machine equipment used is the same as that in Example 1 and is prepared according to the following method:

[0070] A first brittle filament (glass fiber bundle filament) is fed into the hollow tube of the lower hollow spindle of the hollow spindle wrapping spinning machine through a first tension control disk, and the lower soft yarn (polyester / cotton blended yarn) wound on the lower hollow spindle is unwound and wrapped around the surface of the first brittle filament (glass fiber bundle filament) to form a first core shaft;

[0071] The other second brittle filament (glass fiber bundle filament) passes through the second tension control disk and then passes through the center tube adjacent to the center tube of the lower hollow ingot, and then is fed together with the first mandrel into the center tube of the upper hollow ingot corresponding to the center tube of the lower hollow ingot to form a dual-mandrel system;

[0072] The upper soft yarn (pure wool yarn) wound on the upper hollow spindle is unwound and coated on the surface of the double-core shaft system to obtain a double-core skin-structured brittle filament coated yarn.

[0073] The spinning process parameters for spinning biaxial sheath-core structured brittle filament covered yarn are shown in Table 1.

[0074] Example 6

[0075] The hollow spindle wrapped spinning machine equipment used is the same as that in Example 1 and is prepared according to the following method:

[0076] A first brittle filament (basalt fiber bundle filament) is fed into the hollow tube of the lower hollow spindle of the hollow spindle wrapping spinning machine through a first tension control disk, and the lower soft yarn (viscose staple yarn) wound on the lower hollow spindle is unwound and wrapped around the surface of the first brittle filament (basalt fiber bundle filament) to form a first core shaft;

[0077] The second brittle filament (basalt fiber bundle filament) passes through the second tension control disk and then passes through the center tube adjacent to the center tube of the lower hollow ingot. Then, it is fed together with the first mandrel into the center tube of the upper hollow ingot corresponding to the center tube of the lower hollow ingot to form a dual-mandrel system.

[0078] The upper soft yarn (polyester / cotton blended yarn) wound on the upper hollow spindle is unwound and coated on the surface of the double-core system to obtain a double-core sheath-structured brittle filament coated yarn.

[0079] The spinning process parameters for spinning biaxial sheath-core structured brittle filament covered yarn are shown in Table 1.

[0080] Table 1 Spinning process parameters of biaxial sheath-core structured brittle filament covered yarn

[0081]

[0082] In Examples 1-6 of the present invention, soft yarns are used for biaxial sheath-core structure wrapped protective spinning, which can effectively protect and prevent the brittle fiber filaments from being damaged during the processing.

[0083] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A biaxial sheath-core structured brittle filament covered yarn, characterized in that: The invention comprises a double-core system and a soft yarn wrapped on the double-core system, wherein the double-core system comprises a first core and a second core, wherein the first core is formed by the soft yarn covering a first brittle filament, and the second core is a second brittle filament; The wrapping direction of the soft yarn wrapped on the double-core system is opposite to the wrapping direction of the soft yarn in the first core; the soft yarn wrapped on the double-core system is the same as or different from the soft yarn in the first core; The brittle filaments include one or more of carbon fiber filaments, glass fiber filaments and basalt fiber filaments; The soft yarn comprises one or more blended yarns selected from the group consisting of cotton yarn, polyester spun yarn, wool yarn, silk yarn and viscose spun yarn; The method for preparing the biaxial sheath-core structured brittle filament covered yarn is prepared in a one-step process, comprising the following steps: A first brittle filament (1) is fed into a hollow spindle wrapping center tube (41) of a lower hollow spindle of a spinning machine through a first tension control disk (31), and a lower soft yarn (7) wound on the lower hollow spindle (40) is unwound and wrapped around the surface of the first brittle filament (1) to form a first core shaft (8); The second brittle filament (2) passes through the second tension control disk (32) and then passes through the center tube (51) adjacent to the center tube (41) of the lower hollow ingot, and then is fed together with the first core shaft (8) into the center tube (61) of the upper hollow ingot corresponding to the center tube (41) of the lower hollow ingot to form a dual-core shaft system; The upper soft yarn (9) wound on the upper hollow spindle (60) is unwound and coated on the surface of the double-core shaft system to obtain the double-core skin-structured brittle filament coated yarn (10).

2. The biaxial sheath-core structured brittle filament covered yarn according to claim 1, characterized in that: The spindle speed of the spinning machine is 5000r / min-8000r / min.

3. The biaxial sheath-core structured brittle filament covered yarn according to claim 1, characterized in that: The soft yarn (7) is unwound and wrapped around the surface of the brittle filament (1) at a wrapping density of 400 T / m-950 T / m.

4. The biaxial sheath-core structured brittle filament covered yarn according to claim 1, characterized in that: The soft yarn (9) wound on the upper hollow spindle (60) is unwound and wrapped on the surface of the double-core shaft system at a wrapping density of 500 T / m-1500 T / m.

5. Use of the biaxial sheath-core structured brittle filament covered yarn according to any one of claims 1 to 4 in the preparation of special protective clothing and technical textiles.

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