Off-center core-sheath colored fiber, method for preparing the same, and apparatus for preparing the same
By designing colored fibers with an eccentric core-shell structure, utilizing the eccentric hole design of the spinneret and the transparency of the polymer, the problem of the single color of existing colored fibers is solved, achieving multi-color mixing effects and simplifying the processing flow, thereby improving the color uniformity and richness of the fibers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINESE TEXTILE ACAD
- Filing Date
- 2019-12-23
- Publication Date
- 2026-05-22
AI Technical Summary
Existing colored fibers produce a single color effect during the spinning process, making it difficult to achieve multi-color mixing effects, and the processing procedures are cumbersome.
Colored fibers with an eccentric core-sheath structure are produced by extruding core and sheath melts of different colors through eccentric first and second spinnerets on a spinneret. This results in an eccentric distribution of the core layer within the sheath layer. By utilizing the transparency of the polymer and the color superposition effect, a rich color mixing effect can be achieved when viewed from different angles.
It achieves rich color mixing effects when colored fibers are viewed from different angles, simplifies the processing flow, reduces the blending or doubling process, and improves color uniformity and layer richness.
Smart Images
Figure CN111074377B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of chemical fiber technology, and in particular to an eccentric core-sheath type colored fiber, its preparation method and preparation apparatus. Background Technology
[0002] In existing technologies, apart from a few fibers made from polymers such as para-aramid and polyphenylene sulfide that are inherently colored, the vast majority of colored fibers are obtained by adding colorants such as masterbatches and color oils during the spinning process, and are often referred to as solution-dyed fibers. Typically, achieving multi-color mixing effects on a single yarn involves blending or doubling multiple fibers of different colors. Short fibers are primarily blended, with various mixing methods such as fiber-to-filament blending and sliver blending. Long filaments are mainly produced through doubling and twisting or texturing. The final textile product can exhibit a rich variety of color gradations. However, these colored fibers usually have a single color effect. Summary of the Invention
[0003] In view of this, the present invention provides an eccentric core-sheath type colored fiber, its preparation method and preparation apparatus. The eccentric core-sheath type colored fiber prepared by the preparation method and preparation apparatus can make the core layer eccentrically distributed in the sheath layer. As a result, the colored fiber appears in different colors when viewed from different angles, presenting a richer color mixing effect, and thus is more suitable for practical use.
[0004] To achieve the first objective mentioned above, the technical solution for eccentric core-sheath type colored fibers provided by the present invention is as follows:
[0005] The eccentric sheath-core type colored fiber provided by the present invention includes a sheath layer and a core layer, wherein the sheath layer covers the outer periphery of the core layer, wherein...
[0006] Viewed from the cross-section of the eccentric core-shell type colored fiber, the core layer is offset from the geometric center of the sheath layer;
[0007] The core layer and the skin layer have different colors.
[0008] The eccentric core-sheath type colored fiber provided by the present invention can be further realized by the following technical measures.
[0009] As a preferred option
[0010] The polymer used in the skin layer is selected from polyethylene terephthalate, polyethylene terephthalate, polyethylene terephthalate, polypropylene, polycaprolactam, polyhexamethylene adipamide, polylactic acid, and polyethylene terephthalate modified with sodium isophthalate-5-sulfonate or polyethylene glycol, phthalic anhydride, isophthalic acid, adipic acid, sebacic acid.
[0011] The polymer used in the core layer is selected from polyethylene terephthalate, polyethylene terephthalate, polyethylene butylene terephthalate, polypropylene, polycaprolactam, polyhexamethylene adipamide, polylactic acid, and polyethylene terephthalate modified with sodium isophthalate-5-sulfonate or polyethylene glycol, phthalic anhydride, isophthalic acid, adipic acid, sebacic acid.
[0012] As a preferred option
[0013] The radial cross-section of the core layer is circular;
[0014] The shape of the radial cross-section of the skin is selected from one of the following: circular, triangular, or linear.
[0015] As a preferred option
[0016] The percentage of the radial cross-sectional area of the core layer to the radial cross-sectional area of the skin layer ranges from 5% to 95%.
[0017] To achieve the second objective mentioned above, the technical solution for the preparation method of eccentric core-sheath type colored fibers provided by the present invention is as follows:
[0018] The method for preparing eccentric core-sheath type colored fibers provided by the present invention includes the following steps:
[0019] Prepare a core melt containing a first colorant;
[0020] Prepare a skin melt containing a second colorant;
[0021] A spinneret is selected that includes a first spinneret hole and a second spinneret hole, wherein the diameter of the first spinneret hole is smaller than the diameter of the second spinneret hole, and the first spinneret hole is offset from the geometric center of the second spinneret hole.
[0022] Under set temperature conditions, while the core layer melt flows through the first spinneret, the skin layer melt flows through the core layer melt, forming a first intermediate product at the outlet of the first spinneret and the outlet of the second spinneret.
[0023] After post-processing, the first intermediate product is used to obtain the filaments or staple fibers of the eccentric core-shell type colored fiber.
[0024] The color of the first colorant is different from the color of the second colorant.
[0025] The method for preparing eccentric core-shell type colored fibers provided by the present invention can be further realized by the following technical measures.
[0026] As a preferred option
[0027] The post-processing includes cooling, stretching, and winding steps in sequence, and the eccentric core-shell type colored fiber is an eccentric core-shell type colored fiber filament.
[0028] As a preferred option
[0029] The post-processing includes the steps of cooling, stretching, crimping and cutting, and the eccentric core-sheath type colored fiber is an eccentric core-sheath type colored fiber short fiber.
[0030] As a preferred option
[0031] The first spinneret is circular in shape;
[0032] The shape of the second spinneret is selected from one of the following: circular, triangular, or straight.
[0033] As a preferred option
[0034] The percentage of the radial cross-sectional area of the first spinneret to the radial cross-sectional area of the second spinneret ranges from 5% to 95%.
[0035] To achieve the third objective mentioned above, the technical solution of the apparatus for preparing eccentric core-sheath type colored fibers provided by the present invention is as follows:
[0036] The apparatus for preparing eccentric core-sheath type colored fibers provided by the present invention includes a spinneret.
[0037] The spinneret is provided with a first spinneret hole and a second spinneret hole, wherein the diameter of the first spinneret hole is smaller than the diameter of the second spinneret hole, and the first spinneret hole is offset from the geometric center of the second spinneret hole.
[0038] The apparatus for preparing eccentric core-sheath type colored fibers provided by the present invention can be further implemented by the following technical measures.
[0039] Preferably, the percentage of the radial cross-sectional area of the first spinneret to the radial cross-sectional area of the second spinneret is in the range of 5% to 95%.
[0040] Preferably, the spinneret includes a spinneret body, a receiving plate, and a guide column.
[0041] The receiving plate has a through hole in its center;
[0042] The diameter of the drainage column is the same as the diameter of the through hole, and the drainage column is fixedly connected to the edge of the through hole through its upper edge;
[0043] The lower edge of the guide column is submerged below the upper surface of the spinneret body, so that the lower edge of the guide column forms the first spinneret hole;
[0044] The receiving plate is positioned above the upper surface of the spinneret body.
[0045] The eccentric colored fiber, its preparation method, and preparation apparatus provided by this invention employ an eccentric core-sheath structure to obtain colored fibers through composite spinning of two different color components. Due to the transparency of the polymer and the color superposition effect, different colors are observed when viewed from different angles of the fiber. Furthermore, in the final textile product, the randomness of the fiber twist angle results in a mixed-color effect, enriching the types of solution-dyed fiber products. Compared to products produced by blending or doubling two different colored fibers, the fiber produced by this invention has richer color gradations, better uniformity, eliminates the need for blending or doubling processes, and has a shorter processing flow, offering significant advantages. Attached Figure Description
[0046] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0047] Figure 1 This is a schematic diagram of the radial cross-sectional structure of the eccentric core-shell type colored fiber involved in the first embodiment of the present invention, wherein the radial cross-section of the core layer 1 is circular and the radial cross-section of the sheath layer 2 is circular.
[0048] Figure 2 This is a schematic diagram of the radial cross-sectional structure of the eccentric core-shell type colored fiber involved in the second embodiment of the present invention, wherein the radial cross-section of the core layer 1 is circular and the radial cross-section of the sheath layer 2 is straight.
[0049] Figure 3 This is a schematic diagram of the spinneret configuration used in the preparation process of the eccentric core-shell type colored fiber involved in Embodiment 1 of the present invention.
[0050] Figure 4 This is a schematic diagram of the spinneret configuration used in the preparation process of the eccentric core-shell type colored fiber involved in Embodiment 2 of the present invention.
[0051] Figure 5 This is a flowchart illustrating the preparation method of eccentric core-shell type colored fiber according to Embodiment 1 or Embodiment 2 of the present invention. Detailed Implementation
[0052] To address the problems existing in the prior art, this invention provides an eccentric core-sheath type colored fiber and its preparation method, which enables the core layer to be eccentrically distributed in the sheath layer. As a result, the colored fiber appears in different colors when viewed from different angles, presenting a richer color mixing effect, and thus is more suitable for practical use.
[0053] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of the eccentric core-sheath type colored fiber and its preparation method proposed according to the present invention. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, features, structures, or characteristics in one or more embodiments can be combined in any suitable form.
[0054] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships, such as A and / or B. Specifically, it can mean that A and B can be included at the same time, A can exist alone, or B can exist alone, and any of the above three situations can be met.
[0055] Eccentric core-shell type colored fiber
[0056] The eccentric core-sheath type colored fiber provided by this invention includes a sheath layer and a core layer, with the sheath layer covering the outer periphery of the core layer. Specifically, when viewed in cross-section, the core layer is offset from the geometric center of the sheath layer; the core layer and the sheath layer have different colors.
[0057] The eccentric colored fiber provided by this invention employs an eccentric core-sheath structure to produce colored fibers through composite spinning of two different color components. Due to the transparency of the polymer and the color superposition effect, different colors are observed when viewed from different angles of the fiber. Furthermore, in the final textile product, the randomness of the fiber twist angle results in a mixed-color effect, enriching the types of solution-dyed fiber products. Compared to products produced by blending or doubling two different colored fibers, the fiber produced by this invention has richer color gradations, better uniformity, eliminates the need for blending or doubling processes, and has a shorter processing flow, offering significant advantages.
[0058] The polymer used in the skin layer is selected from polyethylene terephthalate, polyethylene terephthalate, polyethylene butylene terephthalate, polypropylene, polycaprolactam, polyhexamethylene adipamide, polylactic acid, and a polymer-modified polyethylene terephthalate with sodium isophthalate-5-sulfonate or polyethylene glycol, phthalic anhydride, isophthalic acid, adipic acid, or sebacic acid. The polymer used in the core layer is selected from polyethylene terephthalate, polyethylene terephthalate, polyethylene butylene terephthalate, polypropylene, polycaprolactam, polyhexamethylene adipamide, polylactic acid, and a polymer-modified polyethylene terephthalate with sodium isophthalate-5-sulfonate or polyethylene glycol, phthalic anhydride, isophthalic acid, adipic acid, or sebacic acid. These polymers have heat-fusible properties, which facilitates the production of the eccentric colored fiber after passing through a spinneret.
[0059] The core layer has a circular radial cross-section, while the sheath layer has a radial cross-section selected from a circle, a triangle, or a straight line. In this case, the core layer is distributed unevenly / asymmetrically within the sheath layer, resulting in significant unevenness in the thickness of the sheath layer at different locations. This allows the eccentric core-sheath type colored fiber to exhibit a richer visual effect when viewed as a whole or from different angles.
[0060] The percentage of the radial cross-sectional area of the core layer to the radial cross-sectional area of the sheath layer ranges from 5% to 95%. A higher percentage of the radial cross-sectional area of the core layer to the radial cross-sectional area of the sheath layer results in a greater degree of color effect from the core layer in the eccentric core-sheath type colored fibers; conversely, a lower percentage of the radial cross-sectional area of the core layer to the radial cross-sectional area of the sheath layer results in a less pronounced color effect from the core layer in the eccentric core-sheath type colored fibers.
[0061] Preparation method of eccentric core-sheath type colored fiber
[0062] See appendix Figure 5 The method for preparing eccentric core-sheath type colored fibers provided by the present invention includes the following steps:
[0063] Prepare a core melt containing a first colorant;
[0064] Prepare a skin melt containing a second colorant;
[0065] A spinneret is selected that includes a first spinneret hole and a second spinneret hole, wherein the diameter of the first spinneret hole is smaller than the diameter of the second spinneret hole, and the first spinneret hole is offset from the geometric center of the second spinneret hole.
[0066] Under set temperature conditions, while the core layer melt flows through the first spinneret, the skin layer melt flows through the core layer melt, forming a first intermediate product at the outlet of the first spinneret and the outlet of the second spinneret.
[0067] After post-processing, the first intermediate product is used to obtain filaments or staple fibers of eccentric core-sheath type colored fiber.
[0068] The color of the first colorant is different from the color of the second colorant.
[0069] The method for preparing eccentric colored fibers provided by this invention employs an eccentric core-sheath structure to composite spin two different color components to obtain colored fibers. Due to the transparency of the polymer and the color superposition effect, different colors are observed when viewed from different angles of the fiber. Furthermore, in the final textile product, the randomness of the fiber twist angle results in a mixed-color effect, enriching the types of solution-dyed fiber products. Compared to products produced by blending or doubling two different colored fibers, the fibers produced by this invention have richer color gradations, better uniformity, and require no blending or doubling process, resulting in a shorter processing flow and significant advantages.
[0070] The post-processing includes cooling, stretching, and winding steps, and the eccentric core-shell type colored fiber is an eccentric core-shell type colored fiber filament.
[0071] The post-processing includes cooling, stretching, crimping and cutting steps in sequence. The eccentric core-sheath type colored fiber is an eccentric core-sheath type colored fiber short fiber.
[0072] The first spinneret is circular; the second spinneret is selected from a shape that is circular, triangular, or linear. In this case, the core layer is distributed unevenly / asymmetrically within the cortex, resulting in significant unevenness in the thickness of the cortex at different locations. This allows the eccentric core-cortex colored fibers to exhibit a richer visual effect when viewed as a whole or from different angles.
[0073] The percentage of the radial cross-sectional area of the first spinneret to the radial cross-sectional area of the second spinneret ranges from 5% to 95%. Specifically, the higher the percentage of the radial cross-sectional area of the core layer to the radial cross-sectional area of the sheath layer, the more the eccentric core-sheath type colored fiber exhibits the color effect of the core layer; conversely, the lower the percentage of the radial cross-sectional area of the core layer to the radial cross-sectional area of the sheath layer, the less the eccentric core-sheath type colored fiber exhibits the color effect of the core layer.
[0074] Apparatus for preparing eccentric core-sheath type colored fibers
[0075] The apparatus for preparing eccentric core-sheath type colored fibers provided by the present invention includes a spinneret. The spinneret is provided with a first spinneret hole and a second spinneret hole, wherein the diameter of the first spinneret hole is smaller than the diameter of the second spinneret hole, and the first spinneret hole is offset from the geometric center of the second spinneret hole.
[0076] The apparatus for preparing eccentric colored fibers provided by this invention employs an eccentric core-sheath structure to composite spin two different color components to obtain colored fibers. Due to the transparency of the polymer and the color superposition effect, different colors are observed when viewing the fiber from different angles. Furthermore, in the final textile product, the randomness of the fiber twist angle results in a mixed-color effect, enriching the types of solution-dyed fiber products. Compared to products produced by blending or doubling two different colored fibers, the fibers produced by this invention have richer color gradations, better uniformity, and require no blending or doubling process, resulting in a shorter processing flow and significant advantages.
[0077] The percentage of the radial cross-sectional area of the first spinneret to the radial cross-sectional area of the second spinneret ranges from 5% to 95%. Specifically, the higher the percentage of the radial cross-sectional area of the core layer to the radial cross-sectional area of the sheath layer, the more the eccentric core-sheath type colored fiber exhibits the color effect of the core layer; conversely, the lower the percentage of the radial cross-sectional area of the core layer to the radial cross-sectional area of the sheath layer, the less the eccentric core-sheath type colored fiber exhibits the color effect of the core layer.
[0078] The spinneret includes a spinneret body 6, a receiving plate 3, and a guide column 4. The receiving plate 3 has a through hole at its center; the guide column 4 has the same diameter as the through hole, and its upper edge is fixedly connected to the edge of the through hole; the lower edge of the guide column 4 is submerged below the upper surface of the spinneret body 6, forming a first spinneret hole; the receiving plate 3 is positioned above the upper surface of the spinneret body 6. (See appendix) Figure 3 The second spinneret orifice 5a is circular. See appendix. Figure 2 The second spinneret 5b is a straight line. In this case, due to the larger area of the upper surface of the receiving plate 3, it can receive a larger amount of core melt. In application, the core melt flows out from the inside of the guide column 4, and the skin melt flows out from the outer wall of the guide column 4 and the gap between the second spinneret 5a or 5b. That is to say, with the isolation effect of the guide column 4, the core melt and skin melt can avoid mutual interference before forming, so that the core and skin of the finally formed eccentric core-skin colored fiber have a clear boundary line, and do not dissolve in each other during the spinning stage, affecting the final color effect of the eccentric core-skin colored fiber. Because once the core and skin of the eccentric core-skin colored fiber dissolve in each other during the spinning stage, they will form a uniform melt, and it will be impossible to present the technical effect of different colors when viewed as a whole or from different angles.
[0079] Example 1: Circular cross-section eccentric core-shell type colored fiber filament
[0080] Skin layer: polyethylene terephthalate; colorant: masterbatch containing red pigment; total red pigment content: 0.5%.
[0081] Core layer: polyethylene terephthalate; colorant is a masterbatch containing yellow pigment, with a total yellow pigment content of 0.6%.
[0082] The cross-sectional shape and arrangement of the spinneret holes are shown in the attached figure. Figure 1 As shown.
[0083] The diameter of the cortex is twice that of the core, the outer edges of the cortex and the core overlap, the core accounts for 25%, the fiber specification is 160D / 72f, and the spinning temperature is 275-295℃.
[0084] The fiber has a circular cross-section and an overall orange-red appearance, but it is mixed with yellow and red.
[0085] Example 2: Flat cross-section eccentric colored fiber filament
[0086] Skin layer: polycaprolactam; colorant: masterbatch containing blue pigment; total blue pigment content: 1.2%.
[0087] Core layer: Polycaprolactam; colorant is a masterbatch containing yellow pigment, with a total yellow pigment content of 1.6%.
[0088] The cross-sectional shape and arrangement of the spinneret holes are shown in the attached figure. Figure 2 As shown.
[0089] The semi-circular diameter of the cortex is 1.5 times the diameter of the spinneret in the core layer, the core layer accounts for 19.5% of the total fiber, the fiber specification is 100D / 24f, and the spinning temperature is 255-275℃.
[0090] The fiber cross-section is elliptical, and the overall appearance is blue mixed with yellow, with a greenish sheen.
[0091] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.
[0092] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.
Claims
1. An eccentric core-sheath type colored fiber, characterized in that, It includes a skin layer and a core layer, wherein the skin layer covers the outer periphery of the core layer, wherein, Viewed from the cross-section of the eccentric core-shell type colored fiber, the core layer is offset from the geometric center of the sheath layer; The core layer and the outer layer have different colors. The transparency of the polymer and the superposition effect of the colors make the colors appear different when viewed from different angles of the eccentric core-and-outer-shell colored fibers. The polymer used in the outer layer is selected from polyethylene terephthalate, polyethylene terephthalate, polyethylene butylene terephthalate, polypropylene, polycaprolactam, polyhexamethylene adipamide, polylactic acid, and polyethylene terephthalate modified with sodium isophthalate-5-sulfonate or polyethylene glycol, phthalic anhydride, isophthalic acid, adipic acid, sebacic acid, etc. The polymer of the outer layer is transparent.
2. The eccentric core-sheath type colored fiber according to claim 1, characterized in that, The polymer used in the core layer is selected from polyethylene terephthalate, polyethylene terephthalate, polyethylene butylene terephthalate, polypropylene, polycaprolactam, polyhexamethylene adipamide, polylactic acid, and polyethylene terephthalate modified with sodium isophthalate-5-sulfonate or polyethylene glycol, phthalic anhydride, isophthalic acid, adipic acid, and sebacic acid.
3. The eccentric core-sheath type colored fiber according to claim 1, characterized in that, The radial cross-section of the core layer is circular; The shape of the radial cross-section of the skin is selected from one of the following: circular, triangular, or linear.
4. The eccentric core-sheath type colored fiber according to claim 1, characterized in that, The percentage of the radial cross-sectional area of the core layer to the radial cross-sectional area of the skin layer ranges from 5% to 95%.
5. The method for preparing eccentric core-sheath type colored fibers according to any one of claims 1-4, characterized in that, Includes the following steps: Prepare a core melt containing a first colorant; Prepare a skin melt containing a second colorant; A spinneret is selected that includes a first spinneret hole and a second spinneret hole, wherein the diameter of the first spinneret hole is smaller than the diameter of the second spinneret hole, and the first spinneret hole is offset from the geometric center of the second spinneret hole. Under set temperature conditions, while the core layer melt flows through the first spinneret, the skin layer melt flows through the core layer melt, forming a first intermediate product at the outlet of the first spinneret and the outlet of the second spinneret. After post-processing, the first intermediate product is used to obtain the filaments or staple fibers of the eccentric core-shell type colored fiber. The color of the first colorant is different from the color of the second colorant.
6. The method for preparing eccentric core-sheath type colored fibers according to claim 5, characterized in that, The post-processing includes cooling, stretching, and winding steps in sequence, and the eccentric core-shell type colored fiber is an eccentric core-shell type colored fiber filament.
7. The method for preparing eccentric core-sheath type colored fibers according to claim 5, characterized in that, The post-processing includes the steps of cooling, stretching, crimping and cutting, and the eccentric core-sheath type colored fiber is an eccentric core-sheath type colored fiber short fiber.
8. The method for preparing eccentric core-sheath type colored fibers according to claim 5, characterized in that, The first spinneret is circular in shape; The shape of the second spinneret is selected from one of the following: circular, triangular, or straight.
9. The method for preparing eccentric core-sheath type colored fibers according to claim 5, characterized in that, The percentage of the radial cross-sectional area of the first spinneret to the radial cross-sectional area of the second spinneret ranges from 5% to 95%.