Covered yarn and the flat, hollow fibers and hollow-structured fabrics produced therefrom

Abstract

The present invention provides covered yarn and flat hollow fibers and fabrics with flat hollow structures produced therefrom. [Solution] The covered yarn comprises a core biodegradable fiber 100 and an outer covering fiber 200, wherein the cross-sectional shape of the core biodegradable fiber is a flat strip. By employing a core biodegradable fiber with a hollow flat strip cross-section, the outer covering fiber is wound around a flat hollow cavity structure, significantly reducing the bending rigidity of the resulting flat hollow fiber, making the fabric softer and fluffier, and making it particularly suitable for products where high comfort is strictly required, such as baby underwear and loungewear.

Description

Technical Field

[0001] The present invention relates to the field of spinning technology. Specifically, it relates to covered yarn and flat hollow fibers and fabrics with a flat hollow structure produced therefrom. It is a flat hollow fiber and a fabric with a flat hollow structure.

Background Art

[0002] Threads and fabrics having a hollow structure are increasingly favored in the market due to their excellent softness, soft texture, moisture absorption and quick drying property , and good heat insulation and heat preservation performance. Currently, the main technical approach for manufacturing hollow yarn is to first spin a covered yarn with a biodegradable fiber as the core and a natural fiber or a regenerated fiber as the outer covering, and then selectively remove the core part by alkali treatment or hydrolysis treatment to form a hollow structure.

[0003] CN203782316U discloses a covered yarn, hollow yarn produced therefrom, a fabric with a hollow structure and a hollow towel. Since this hollow yarn adopts a design of core fibers having a circular cross-section, its dissolution process often shows the characteristic of proceeding from the outside to the inside, and it is easy for a locally non-uniform force to be applied to the outer covering fibers, which easily causes eccentricity, collapse, or <000,0019> <, closed holes of the hollow cavity. Even if the dissolution is successful and a hollow structure can be formed, the winding form of the remaining outer covering fibers is often relatively tight, and the bending rigidity of the whole yarn tends to increase.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The object of the present invention is to provide a covered yarn, flat hollow fibers produced therefrom, and a fabric with a flat hollow structure in order to solve the problems proposed in the above background art. [Means for solving the problem]

[0005] To achieve the above objective, this invention provides the following technical solution, and the covered yarn has a core Partially biodegradable fibers and core biodegradation by open-end spinning or non-open-end spinning method. The biodegradable core fiber includes an outer sheath fiber wrapped around the outer circumference, and the cross-sectional shape of the biodegradable core fiber is It has a hollow, flattened, band-like shape.

[0006] Preferably, the cross-section of the core biodegradable fiber is a flattened rounded rectangle or a flattened ellipse. Yes, the ratio of the width to the thickness of the core biodegradable fiber is 2:1 to 4:1.

[0007] Preferably, the core biodegradable fiber has a certain length extending along the fiber axis in the circumferential direction. Directional grooves are provided, and two of these longitudinal grooves are aligned with the centerlines of the upper and lower width surfaces, respectively. They are located in a position and face each other directly.

[0008] Preferably, the cross-sectional shape of the longitudinal groove is one of rectangular, V-shaped, or arc-shaped. There is one.

[0009] Preferably, the depth of the longitudinal groove is 10% to 20% of the wall thickness of the core biodegradable fiber. That is the case.

[0010] Preferably, the outer covering fibers are cotton fibers, hemp fibers, bamboo pulp fibers, or lyocell fibers. It is at least one of the following.

[0011] This invention further provides the following technical solution: The flattened hollow fiber is used with the covered yarn described above. Formed by dissolving and removing the core biodegradable fibers by treatment with an alkaline solution, The flat hollow fiber has a flat hollow channel corresponding to the above core biodegradable fiber.

[0012] The present invention further provides the following technical solution. The fabric with a flat hollow structure is formed by weaving the above-covered yarn and then treating it with an alkaline solution to dissolve and remove the core biodegradable fiber. The fibers in the fabric with the flat hollow structure have a flat hollow channel corresponding to the above core biodegradable fiber.

Advantages of the Invention

[0013] Compared with the prior art, the present invention has the following beneficial effects.

[0014] 1. By adopting a core biodegradable fiber with a cross-section呈 hollow flat strip shape, after treatment with an alkaline solution and dissolution and removal, a regular flat hollow cavity is formed, and it is realized that the outer covering fiber is wound around the flat hollow cavity structure, significantly reducing the bending rigidity of the obtained flat hollow fiber, making the texture of the fabric softer and more supple, enhancing the dynamic wearing comfort, and being particularly applicable to products with high comfort requirements, such as underwear for infants and room wear like lingerie.

[0015] 2. The longitudinal groove in the present invention serves as a high specific surface area region and stress concentration point on the surface of the core biodegradable fiber, rapidly adsorbing the alkaline solution and being preferentially hydrolyzed at the initial stage of dissolution. Thereby, a microchannel continuously penetrating along the fiber length direction is formed, effectively guiding the dissolution reaction to proceed simultaneously from the surface to the inside and along the axial direction, and significantly shortening the time until the core is completely dissolved and removed.

[0016] 3. The present invention increases the microscopic roughness of the surface of the core biodegradable fiber by means of longitudinal grooves, and increases the coefficient of static friction with the sheath fiber. In the spinning process, the sheath fiber is less likely to slip under the action of tension, and the winding structure is more compact and stable, which is beneficial to improving the quality of the covered yarn products and their subsequent processing performance.

[0017] 4. Since the core biodegradable fiber of the present invention adopts a hollow flat belt-shaped design, compared with the conventional solid core fiber, it itself has a lower bending elastic modulus and a larger specific surface area. In the spinning process, the hollow structure imparts higher flexibility to the core and enables it to adhere more closely to the sheath fiber. In the subsequent alkali treatment, the longitudinal grooves on the inner wall and outer surface of the hollow together constitute a multi-dimensional erosion channel, realizing the rapid and uniform disintegration of the core fiber, further avoiding the residue of the core material, ensuring the purity and regularity of the final flat hollow channel, and effectively improving the drapability and softness of the fabric.

Brief Description of the Drawings

[0018] [Figure 1] It is a schematic structural diagram of Example 1. [Figure 2] It is a schematic structural diagram of Example 2. [Figure 3] It is a schematic structural diagram of Example 3. [Figure 4] It is a schematic structural diagram of Example 4.

Modes for Carrying Out the Invention

[0019] Hereinafter, in connection with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only This does not represent all embodiments. Based on the embodiments of this invention, those skilled in the art can exert creative effort to... All other embodiments obtained under the premise that this does not apply are all within the scope of protection of the present invention.

[0020] This invention relates to covered yarn and the flat hollow fibers and flat hollow structure fabric produced from it. It provides. Covered yarn consists of a core biodegradable fiber 100 and a wrapped around its outer circumference. It includes outer sheath fibers 200. The cross-sectional shape of the core biodegradable fiber 100 is hollow and flattened into a strip shape. The ratio of width to thickness is controlled between 2:1 and 4:1. Dissolution efficiency and spinning stability are optimized. To achieve this, the core biodegradable fiber 100 has a slightly longer core in the circumferential direction, extending along the fiber axis. Directional grooves 101 are provided, and at least two longitudinal grooves 101 are located on top of each other. It is located on the center line of the width surface and the bottom width surface, and is directly opposite to each other. Cross-sectional shape of the longitudinal groove 101 The shape may be rectangular, V-shaped, or arc-shaped, and its depth is the core biodegradable fiber 100 wall thickness Strictly controlled within a range of 10% to 20%. The outer covering fiber 200 is made of cotton fiber, hemp fiber, and bamboo pulp. The fibers may be selected from at least one of the fibers or lyocell fibers, and open-end spinning The core is tightly covered by a spinning or non-open-end spinning process.

[0021] Example 1 Referring to Figure 1, this embodiment provides covered yarn.

[0022] The core biodegradable fiber 100 is made of polylactic acid material and manufactured by melt spinning, and its lateral The cross-section is a hollow, flattened ellipse. The outer fiber 200 is selected from fine cotton and ring spinning mill. Covered yarn was manufactured according to the instructions.

[0023] Example 2 Referring to Figure 2, this embodiment provides a covered yarn with a different cross-sectional shape.

[0024] The material of the core biodegradable fiber 100 is the same as in Example 1, but the cross-section is a hollow, flat corner It was adjusted to a rounded rectangle. One longitudinal groove 10 is placed directly opposite each other at the center line of the upper and lower width surfaces. Each of the 1s is provided. The cross-section of the longitudinal groove 101 is rectangular, and the depth is 1 of the wall thickness. The 0% density and relatively deep rectangular longitudinal grooves facilitate the rapid penetration of alkaline solutions. (Outer fiber) 200 selects lyocell fibers and manufactures covered yarn using an air-jet spinning process. Ta.

[0025] Example 3 Referring to Figure 3, this embodiment shows a covered yarn with a specific longitudinal groove shape.

[0026] The core biodegradable fiber 100 has a hollow, flattened ellipse cross-section, with a total of four circumferential directions. A longitudinal groove 101 is provided. Here, the two are the upper and lower width surfaces of the core biodegradable fiber 100. It is located in the center and directly opposite, and the remaining two are on the narrow surfaces on both sides of the core biodegradable fiber 100. It is located in the center. The cross-section of the longitudinal groove 101 is V-shaped, with an angle of 45°, and the depth is the wall thickness. It is 8% of that. The V-shaped tip acts as a stress concentration point, and the alkaline solution micro is released along the axial direction. It can be effectively guided to form channels. The outer fiber 200 is a hemp-cotton blend fiber. We selected this method and manufactured covered yarn using ring spinning.

[0027] Example 4 Referring to Figure 4, this embodiment shows a different longitudinal groove shape.

[0028] The core structure is such that the cross-section of the core biodegradable fiber 100 is a hollow, flattened ellipse. Two opposing longitudinal grooves 101 are provided only at the center of the upper and lower width surfaces, and the longitudinal grooves 101 The cross-section is arc-shaped, and the design of the shallow, rounded longitudinal groove 101 is primarily focused on surface roughness. Increasing this increases the bonding strength with the outer fibers, but at the same time, excessive stress can cause the fibers to break during spinning. This is to avoid cutting. The outer covering fiber 200 is selected from bamboo pulp fibers, and Covered yarn was manufactured using the Ajet spinning process.

[0029] Example 5 This embodiment provides a flattened hollow fiber, and the covered yarn produced in Example 3 is subjected to hydroxylation. When treated by immersion in a thorium solution, the core biodegradable fiber 100 is completely hydrolyzed. Although it can be dissolved and removed, the outer sheath fibers 200 remain intact.

[0030] Example 6 This embodiment provides a flattened hollow structure fabric, and the covered yarn produced in Example 2 is flattened After weaving the fabric into a raw material, it is treated with an alkaline solution to dissolve the core biodegradable fiber 100. Remove. The fibers in the fabric with a flattened hollow structure have flattened hollow channels.

[0031] In summary, this invention provides a core biodegradable fiber 100 with a specific depth and shape in its longitudinal section. By providing the facing groove 101 and combining it with a flat width-to-thickness ratio of 2:1 to 4:1, The technical challenges of hollow fibers include slow dissolution, susceptibility to collapse due to eccentricity, and instability in yarn production. We succeeded in solving the problem. Specific parameters such as the ratio of width, thickness, and depth in the above embodiment The example shown is merely an illustration, and equivalent modifications within the scope defined in the claims of this invention are not valid. All of these fall within the scope of protection of this invention.

[0032] The above has been a description of embodiments of the present invention, but those skilled in the art will understand the attached claims. Without departing from the principles and spirit of the present invention as defined by and its equivalents, It should be understood that various changes, modifications, substitutions, and variations can be made to these embodiments. cormorant. [Explanation of Symbols]

[0033] 100, core biodegradable fiber; 101, longitudinal grooves; 200, outer covering fiber.

Claims

1. A core biodegradable fiber (100) and an open-end spinning or non-open-end spinning method A core biodegradable fiber (100) with an outer covering fiber (200) wrapped around its outer circumference. Bird yarn, wherein the cross-sectional shape of the core biodegradable fiber (100) is a hollow, flat strip. A covered yarn characterized by exhibiting the following properties.

2. The cross-section of the core biodegradable fiber (100) is a flat, rounded rectangle or a flat, elliptical shape. Furthermore, the ratio of the width to the thickness of the core biodegradable fiber (100) is 2:1 to 4:

1. The covered yarn according to claim 1, characterized by the following:

3. In the circumferential direction of the core biodegradable fiber (100), there are some longitudinal sections extending along the fiber axis. Directional grooves (101) are provided, and two of the longitudinal directional grooves (101) are, each with an upper width The features described in 1, which are located on the center line of the surface and the lower width surface and are directly opposite each other. Covered yarn.

4. The cross-sectional shape of the longitudinal groove (101) is one of the following: rectangular, V-shaped, or arc-shaped. The covered yarn according to claim 3, characterized in that it is one of the following.

5. The depth of the longitudinal groove (101) is 10% of the wall thickness of the core biodegradable fiber (100). The covered yarn according to claim 3, characterized in that it is ~20%.

6. The outer covering fiber (200) is one of the following: cotton fiber, hemp fiber, bamboo pulp fiber, or lyocell fiber. The covered yarn according to claim 1, wherein there is at least one.

7. A flattened hollow fiber, the covered yarn according to any one of claims 1 to 6 Formed by dissolving and removing the core biodegradable fiber (100) by treatment with a potassium solution. Furthermore, the flattened hollow fiber corresponds to the flattened hollow fiber of the core biodegradable fiber described in claim 1. A flattened hollow fiber characterized by having flannel.

8. A fabric having a flattened hollow structure, the covered yarn according to any one of claims 1 to 6. After weaving, the core biodegradable fiber (100) is dissolved and removed by treating it with an alkaline solution. The fibers in the flattened hollow structure of the fabric are formed by the process described in claim 1. A fabric with a flattened hollow structure, characterized by having flattened hollow channels corresponding to biodegradable fibers. 。

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