Cotton-like composite yarn and preparation method thereof

Abstract

The invention provides a cotton-like composite yarn and a preparation method thereof, and relates to the technical field of textile. The cotton-like composite yarn comprises a filament A and a filament B, the filament B is a core layer, and the filament A wraps the filament B; the elastic recovery rate of the filaments B is higher than that of the filaments A by 20% or above. Preferably, the filament B has a two-component parallel three-dimensional spiral elastic structure. The cotton-like composite yarn has a good cotton-like effect and can be used for preparing fabrics which are more comfortable to wear.

Description

Technical Field

[0001] The invention belongs to the technical field of textiles and relates to a cotton-like composite yarn and a preparation method thereof. Background Art

[0002] Polyester has excellent mechanical strength, heat resistance, and pilling resistance, while cotton fibers have excellent moisture absorption, softness, and warmth retention. The production of imitation cotton fabrics from polyester is of great significance. It can address the problem of insufficient cotton resources while simultaneously combining the excellent properties of both polyester and cotton fibers. The properties of polyester can be used to compensate for the shortcomings of cotton fabrics, such as improving durability and compensating for deficiencies such as wear resistance and easy deformation. Chinese patent CN109322043A discloses a production process for elastic, flame-retardant, and super-imitation cotton fabrics. The warp yarn is formed by combining a POY and an FDY yarn to form a composite yarn, and the weft yarn is two flame-retardant polyester super-imitation cotton filaments wrapped around the outside of a spandex filament. This technology uses spandex, not just polyester. Chinese patent CN111118623A discloses a cotton-like polyester fiber. PET is spun using the POY and FDY processes, then twisted and doubling. The fibers are then subjected to web lamination, winding, and a relaxation heat treatment. The spinneret for the POY process has circular spinnerets, while the spinneret for the FDY process has trilobal spinnerets. This technology requires the use of two special spinneret structures.

[0003] Therefore, a technology for preparing a cotton-like composite yarn with a more universal preparation method using polyester as the material is needed. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a cotton-like composite yarn and a preparation method thereof.

[0005] The technical solutions of the present invention are as follows:

[0006] A cotton-like composite yarn comprising filaments A and B, wherein the filaments B are a core layer and the filaments A cover the filaments B;

[0007] The elastic recovery rate of the filament B is higher than that of the filament A by 20% or more.

[0008] Preferably, the elastic recovery rate of the filament B is not less than 80%, and the elastic recovery rate of the filament A is 45-60%.

[0009] Preferably, the filament A and the filament B are individually single-component or bi-component;

[0010] The materials of the filaments A and B are independently selected from one or two or more of polyester, PBT and PTT.

[0011] More preferably, the filament B has a bicomponent structure;

[0012] Preferably, the double-component structure is a parallel three-dimensional spiral elastic structure.

[0013] Preferably, the thermal conductivity of the filament A is 0.15-0.3 W / (m·K).

[0014] A preparation method of a cotton-like composite yarn, comprising a filament A and a filament B, the filament B being a core layer, and the filament A wrapping the filament B;

[0015] The elastic recovery rate of the filament B is 20% higher than that of the filament A.

[0016] The preparation method comprises:

[0017] The filament A is fed into a first roller, and is subjected to first stretching through a first drafting roller to obtain a stretched filament A.

[0018] The filament B is fed into a second roller, and is subjected to second stretching through a second drafting roller to obtain a stretched filament B.

[0019] The stretched filament A and the stretched filament B are together introduced into a network nozzle for networking, and then pass through an auxiliary roller, and finally enter a winding mechanism to complete the shaping and winding to obtain the cotton-like composite yarn.

[0020] Preferably, the filament B has a double-component parallel three-dimensional spiral elastic structure.

[0021] The first drafting ratio of the first stretching is less than the second drafting ratio of the second stretching.

[0022] More preferably, the first drafting ratio is 0.99-1.03, and the second drafting ratio is 1.01-1.05.

[0023] Preferably, the weight ratio of the stretched filament A to the stretched filament B is 1:2-3:1.

[0024] Preferably, the air pressure of the networking is 2-4 bar.

[0025] The present application has the following beneficial effects:

[0026] (1) The cotton-like composite yarn of the present application has a core-sheath structure, the inner core being a polyester filament B with relatively good elasticity, and the shell layer being a polyester filament A with relatively poor elasticity, the cotton-like composite yarn combining the characteristics of polyester and cotton materials, having good bulkiness and cotton feel, and having good cotton-like effect.

[0027] (2) The preparation method of the cotton-like composite yarn is relatively simple, the filaments with relatively good elasticity B have relatively obvious resilience and high draft ratio, the filaments with relatively poor elasticity A have less resilience and low draft ratio, so that the filament B is covered by the filament A after shrinkage, and the cotton-like composite yarn with the core filament B and the outer covering layer of the filament A is formed. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A schematic view of a cross-sectional structure of the cotton-like composite yarn of Example 1;

[0029] 1-filament A, 2-filament B. DETAILED DESCRIPTION

[0030] The technical solutions of the present application are further described and explained through specific embodiments.

[0031] In one aspect, the present application provides a cotton-like composite yarn, comprising a filament A and a filament B, the filament B being a core layer, and the filament A covering the filament B.

[0032] The elastic recovery rate of the filament B is 20% or more higher than that of the filament A.

[0033] The cotton-like composite yarn of the present application adopts two kinds of filaments with different elastic recovery rates, and has a core-sheath structure, the filament B with high elastic recovery rate as the core (i.e. the core layer) provides high elasticity and bulkiness, and the filament A with low elastic recovery rate as the shell layer provides cotton hand feeling. Therefore, the cotton-like composite yarn of the present application has good elasticity, excellent cotton hand feeling, and good cotton-like hand feeling.

[0034] In the present application, the elastic recovery rate of the filament A and the filament B can be tested by referring to the method of ISO 20932-1:2018. The filament A and the filament B can be directly obtained from the market or prepared according to the method of the prior art.

[0035] For the difference in elastic recovery rate between the filament A and the filament B, the elastic recovery rate of the filament B is 20%, 22%, 25%, 27%, 30%, 33%, 35%, 35%, 40% or any value or any value between any value higher than that of the filament A.

[0036] In some embodiments, the elastic recovery rate of the filament B is not less than 80%, and the elastic recovery rate of the filament A is 45-60%. For example, the elastic recovery rate of the filament B is any one of or any value between 80%, 82%, 85%, 87%, 90%, etc., and the elastic recovery rate of the filament A is any one of or any value between 45%, 47%, 50%, 52%, 55%, 57%, 60%, etc., such as the elastic recovery rate of the filament B is 80%, the elastic recovery rate of the filament A is 50%, the elastic recovery rate of the filament B is 85%, the elastic recovery rate of the filament A is 50%, the elastic recovery rate of the filament B is 90%, the elastic recovery rate of the filament A is 55%, the elastic recovery rate of the filament B is 90%, the elastic recovery rate of the filament A is 60%, etc.

[0037] In some embodiments, the filament A and the filament B are single-component or double-component respectively.

[0038] The material of the filament A and the filament B is selected from one or two or more of polyester, PBT and PTT respectively.

[0039] The composition and structure of the filament A and the filament B are not particularly limited in the present application, as long as the elastic recovery rate meets the above requirements: the elastic recovery rate of the filament B is not less than 80%, and the elastic recovery rate of the filament A is 45-60%. For example, the filament A can be single-component, and the material is polyester, and the filament B can be double-component, and the material is polyester / PBT; or, the filament A can be single-component, and the material is polyester, and the filament B can be single-component, and the material is PBT; or, the filament A can be double-component, and the material is polyester / PBT, and the filament B can be double-component, and the material is polyester / PTT, etc. For example, when the materials of the filament A and the filament B are both polyester, the filament A can be conventional polyester, and the filament B can be conventional polyester material with reduced crystallinity and improved elastic recovery rate through process adjustment.

[0040] In some embodiments, the filament B has a double-component structure; the double-component structure of the filament B can exhibit the characteristics of the two components, thereby having a higher elastic recovery rate.

[0041] Further, the double-component structure is a parallel three-dimensional spiral elastic structure. That is, the filament B is composed of double components, the double components have a parallel structure and a three-dimensional spiral elastic structure, and the filament B has a good elastic recovery rate, and the elastic recovery rate is not less than 80%.

[0042] In some embodiments, the material of the filament A is polyester, and the material of the filament B is a bicomponent fiber composed of polyester and PBT or PBT. Compared with PET polyester, polybutylene terephthalate (PBT) and polytrimethylene terephthalate (PTT) have better elasticity. The bicomponent parallel composite fiber composed of PET and PBT or PET and PTT will produce three-dimensional spiral curling in the longitudinal direction when heated and form higher and more durable elasticity and fluffiness. There is no particular limitation on the composition of the filament B. Taking the composition of PET and PBT as an example, the weight ratio of PET and PBT can be 1:9-9:1, or further, the weight ratio can be 3:7-7:3.

[0043] In some embodiments, the thermal conductivity of the filament A is 0.15-0.3 W / (m·K), which has better thermal conductivity, so that the cotton-like composite yarn of the application has better cool feeling and good wearing feeling. The thermal conductivity of the filament A can be obtained by adding a filler with high thermal conductivity (such as jade powder, mica, etc.) in the filament A. The type and amount of the filler are different, and the thermal conductivity of the filament A is different. The selection and addition method of the filler with high thermal conductivity in the filament A are well known to those skilled in the art.

[0044] On the other hand, the application also provides a preparation method of a cotton-like composite yarn, which comprises a filament A and a filament B, and the filament B is a core layer, and the filament A covers the filament B.

[0045] The elastic recovery rate of the filament B is 20% higher than that of the filament A.

[0046] The preparation method comprises:

[0047] The filament A is fed into a first roller, stretched by a first drafting roller to obtain a stretched filament A;

[0048] The filament B is fed into a second roller, stretched by a second drafting roller to obtain a stretched filament B;

[0049] The stretched filament A and the stretched filament B enter a network nozzle for networking, then pass through an auxiliary roller, and finally enter a winding mechanism to complete the molding and winding to obtain the cotton-like composite yarn.

[0050] When the preparation of the above-mentioned composite spinning yarn with a core-sheath structure is completed, the stretched filament A and the stretched filament B obtained after the filament A and the filament B are stretched are networked and pass through the auxiliary roller. When relaxed, the filament B with high elastic recovery rate shrinks greatly, and the filament A with low elastic recovery rate shrinks slightly. The filament B with great shrinkage is covered by the filament A with small shrinkage, and thus the composite spinning yarn with a core-sheath structure is formed, in which the filament B is the core layer and the filament A is the shell layer. The functions of the auxiliary roller include auxiliary drafting, guiding and positioning, compaction and setting, tension adjustment, etc.

[0051] In some embodiments, the filament B has a bicomponent side-by-side three-dimensional spiral elastic structure.

[0052] The first draft ratio of the first stretching is less than the second draft ratio of the second stretching.

[0053] The filament B has a bicomponent side-by-side three-dimensional spiral elastic structure, and the filament B has higher elasticity. The first draft ratio of the first stretching is less than the second draft ratio of the second stretching, that is, the draft ratio of the stretched filament A is lower than that of the stretched filament B. The greater the draft ratio of the stretched filament B with high elasticity, the higher the degree of contraction when relaxed, and the more easily it is covered by the filament A and forms a core-sheath structure. There is no particular restriction on the composition of the filament B. Taking PET and PBT as an example, the weight ratio of PET and PBT can be 1:9-9:1, or further, the weight ratio can be 3:7-7:3.

[0054] In some embodiments, the first draft ratio is 0.99-1.03, and the second draft ratio is 1.01-1.05. For example, the first draft ratio can be any value or any value between 0.99, 1, 1.01, 1.02, 1.03, etc., and the second draft ratio can be any value or any value between 1.01, 1.02, 1.03, 1.04, 1.05, etc., such as the first draft ratio is 1 and the second draft ratio is 1.02, the first draft ratio is 1 and the second draft ratio is 1.03, the first draft ratio is 1 and the second draft ratio is 1.05, the first draft ratio is 1.02 and the second draft ratio is 1.04, the first draft ratio is 1.02 and the second draft ratio is 1.05, the first draft ratio is 1.03 and the second draft ratio is 1.05, etc.

[0055] In some embodiments, the weight ratio of the stretched filament A and the stretched filament B is 1:2-3:1. For example, the weight ratio of the stretched filament A and the stretched filament B can be any value or any value between 1:2, 2:3, 1:1, 3:2, 2:1, 5:2, 3:1, etc.

[0056] In some embodiments, the air pressure of the interlacing is 2-4bar. The air pressure of the conventional polyester interlacing generally does not exceed 2bar. The present application adopts a higher interlacing air pressure, which is more conducive to the formation of the core-sheath structure of the filament A and the filament B. For the air pressure of the interlacing, for example, it can be any value or any value between 2bar, 2.5bar, 3bar, 3bar, 3.5bar, 4bar, etc.

[0057] The technical solutions of the present application are further described and explained according to the embodiments below. Unless otherwise specified, the parts in the following embodiments are parts by weight.

[0058] Example 1

[0059] The filament A is polyester, and the elastic recovery rate is 55%; the filament B is PET / PBT bicomponent parallel three-dimensional spiral elastic structure, and the elastic recovery rate is 80%.

[0060] The filament A is fed into the first roller, and the first stretching is performed through the first drafting roller, the first drafting ratio of the first stretching is 1.01, and the stretched filament A is obtained.

[0061] The filament B is fed into the second roller, and the second stretching is performed through the second drafting roller, the second drafting ratio of the second stretching is 1.03, and the stretched filament B is obtained.

[0062] The stretched filament A and the stretched filament B are together into the network nozzle according to the weight ratio 1:2, the air pressure of the network is 2.5 bar, and then the auxiliary roller is passed, finally into the winding mechanism to complete the forming and winding, and the cotton-like composite yarn is obtained.

[0063] The cross-sectional structure of the cotton-like composite yarn obtained in the embodiment is shown in the attached Figure 1 The filament A is the sheath layer, and the filament B is the core layer.

[0064] Example 2

[0065] The difference between the embodiment and example 1 is that the polyester of the filament A has an elastic recovery rate of 60%. The remaining steps remain unchanged.

[0066] Example 3

[0067] The difference between the embodiment and example 1 is that the second drafting ratio of the second stretching in example 1 is adjusted from 1.03 to 1. The remaining steps remain unchanged.

[0068] Example 4

[0069] The difference between the embodiment and example 1 is that the second drafting ratio of the second stretching in example 1 is adjusted from 1.03 to 1.01. The remaining steps remain unchanged.

[0070] Comparative Example 1

[0071] The difference between the comparative example and example 1 is that the elastic recovery rate of the filament B in example 1 is 72%. The remaining steps remain unchanged.

[0072] Example 5

[0073] The filament A is polyester, and the elastic recovery rate is 50%; the filament B is PET / PTT bicomponent parallel three-dimensional spiral elastic structure, and the elastic recovery rate is 85%.

[0074] The filament A is fed into the first roller, and the first stretching is performed through the first drafting roller, the first drafting ratio of the first stretching is 1, and the stretched filament A is obtained.

[0075] The filament B is fed into the second roller, and the second stretching is performed by the second drafting roller, the second drafting ratio of the second stretching is 1.01, and the stretched filament B is obtained.

[0076] The stretched filament A and the stretched filament B are combined together in the network nozzle at a weight ratio of 1:1, the air pressure of the combination is 3.0 bar, and then the auxiliary roller is passed, finally the winding mechanism is entered to complete the forming winding, and the cotton-like composite yarn is obtained.

[0077] Example 6

[0078] The filament A is polyester, and the elastic recovery rate is 55%; the filament B is a PET / PTT bicomponent parallel three-dimensional spiral elastic structure, and the elastic recovery rate is 80%.

[0079] The filament A is fed into the first roller, and the first stretching is performed by the first drafting roller, the first drafting ratio of the first stretching is 1.01, and the stretched filament A is obtained.

[0080] The filament B is fed into the second roller, and the second stretching is performed by the second drafting roller, the second drafting ratio of the second stretching is 1.05, and the stretched filament B is obtained.

[0081] The stretched filament A and the stretched filament B are combined together in the network nozzle at a weight ratio of 3:2, the air pressure of the combination is 3.0 bar, and then the auxiliary roller is passed, finally the winding mechanism is entered to complete the forming winding, and the cotton-like composite yarn is obtained.

[0082] Example 7

[0083] The filament A is polyester, and the elastic recovery rate is 55%; the filament B is a PET / PTT bicomponent parallel three-dimensional spiral elastic structure, and the elastic recovery rate is 90%.

[0084] The filament A is fed into the first roller, and the first stretching is performed by the first drafting roller, the first drafting ratio of the first stretching is 1.03, and the stretched filament A is obtained.

[0085] The filament B is fed into the second roller, and the second stretching is performed by the second drafting roller, the second drafting ratio of the second stretching is 1.05, and the stretched filament B is obtained.

[0086] The stretched filament A and the stretched filament B are combined together in the network nozzle at a weight ratio of 2:1, the air pressure of the combination is 3.5 bar, and then the auxiliary roller is passed, finally the winding mechanism is entered to complete the forming winding, and the cotton-like composite yarn is obtained.

[0087] Example 8

[0088] The filament A is polyester, and the elastic recovery rate is 60%; the filament B is a PET / PBT bicomponent parallel three-dimensional spiral elastic structure, and the elastic recovery rate is 80%.

[0089] The filament A is fed into the first roller, and the first stretching is performed by the first draft roller, and the first draft ratio of the first stretching is 1.01, to obtain the stretched filament A.

[0090] The filament B is fed into the second roller, and the second stretching is performed by the second draft roller, and the second draft ratio of the second stretching is 1.04, to obtain the stretched filament B.

[0091] The stretched filament A and the stretched filament B are together fed into the network nozzle according to the weight ratio of 1:1 for networking, the air pressure of the networking is 4.0 bar, and then the auxiliary roller is passed, and finally the winding mechanism is entered to complete the forming winding, to obtain the cotton-like composite yarn.

[0092] Example 9

[0093] The filament A is polyester, and the elastic recovery rate is 60%; the filament B is PET / PBT bicomponent parallel three-dimensional spiral elastic structure, and the elastic recovery rate is 88%.

[0094] The filament A is fed into the first roller, and the first stretching is performed by the first draft roller, and the first draft ratio of the first stretching is 0.99, to obtain the stretched filament A.

[0095] The filament B is fed into the second roller, and the second stretching is performed by the second draft roller, and the second draft ratio of the second stretching is 1.02, to obtain the stretched filament B.

[0096] The stretched filament A and the stretched filament B are together fed into the network nozzle according to the weight ratio of 3:1 for networking, the air pressure of the networking is 4.0 bar, and then the auxiliary roller is passed, and finally the winding mechanism is entered to complete the forming winding, to obtain the cotton-like composite yarn.

[0097] Comparative Example 2

[0098] The difference between the present comparative example and Example 9 is that in Example 9, the elastic recovery rate of the filament B is adjusted from 88% to 75%. The remaining steps remain unchanged.

[0099] Example 10

[0100] The filament A is polyester, and the elastic recovery rate is 60%; the filament B is polyester, and the elastic recovery rate is 83%.

[0101] The filament A is fed into the first roller, and the first stretching is performed by the first draft roller, and the first draft ratio of the first stretching is 1.01, to obtain the stretched filament A.

[0102] The filament B is fed into the second roller, and the second stretching is performed by the second draft roller, and the second draft ratio of the second stretching is 1.05, to obtain the stretched filament B.

[0103] The stretch yarn A and the stretch yarn B are mixed together in the network nozzle at a weight ratio of 2:1, and the air pressure of the mixing is 3.5 bar, then the yarns pass through an auxiliary roller, and finally the yarns enter a winding mechanism to complete the winding to obtain the cotton-like composite yarn.

[0104] The properties of the cotton-like composite yarns obtained in Examples 1-10 and Comparative Examples 1-2 are shown in Table 1.

[0105] Table 1

[0106] Breaking strength / cN / dtex Crimp shrinkage / % Boiling water shrinkage / % Bulk factor / cm 3 / g Example 1 3.56 34.1 8.82 2.7 Example 2 3.42 31.7 8.53 2.4 Example 3 2.83 19.6 6.61 1.6 Example 4 3.06 22.5 7.14 1.8 Comparative Example 1 2.70 13.8 5.65 1.2 Example 5 3.74 37.2 9.05 3.5 Example 6 3.78 36.4 9.16 3.3 Example 7 3.80 35.9 9.01 4.0 Example 8 3.68 36.0 8.97 3.4 Example 9 3.52 35.8 9.06 3.8 Comparative Example 2 2.54 13.3 5.87 1.4 Example 10 3.35 20.1 7.58 2.0

[0107] Therefore, the cotton-like composite yarn of the present application has good properties and good cotton-like hand feeling.

[0108] The basic principles, main features and advantages of the present application have been shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples are only the preferred embodiments of the present application, and cannot limit the scope of the present application. Equivalent changes and modifications made in accordance with the scope and content of the present application should still be within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A cotton-like composite yarn, characterized in that: It comprises filament A and filament B, wherein the filament B is a core layer and the filament A covers the filament B; The elastic recovery rate of the filament B is higher than that of the filament A by 20% or more.

2. The cotton-like composite yarn according to claim 1, characterized in that: The elastic recovery rate of the filament B is not less than 80%, and the elastic recovery rate of the filament A is 45-60%.

3. The cotton-like composite yarn according to claim 1, characterized in that: The filament A and the filament B are individually single-component or bi-component; The materials of the filaments A and B are independently selected from one or two or more of polyester, PBT and PTT.

4. The cotton-like composite yarn according to claim 3, characterized in that: The filament B has a two-component structure; Preferably, the two-component structure is a parallel three-dimensional helical elastic structure.

5. The cotton-like composite yarn according to claim 1, characterized in that: The thermal conductivity of the filament A is 0.15-0.3 W / (m·K).

6. A method for preparing a cotton-like composite yarn, characterized in that: It comprises filament A and filament B, wherein the filament B is a core layer and the filament A covers the filament B; The elastic recovery rate of the filament B is 20% higher than the elastic recovery rate of the filament A; The preparation method comprises: The filament A is fed into the first roller and is first stretched by the first drafting roller to obtain stretched filament A; The filament B is fed into the second roller and subjected to a second stretching by the second drafting roller to obtain a stretched filament B; The drawn yarn A and the drawn yarn B enter the network nozzle together for meshing, then pass through the auxiliary roller, and finally enter the winding mechanism to complete forming and winding, thereby obtaining the cotton-like composite yarn.

7. The method for preparing the cotton-like composite yarn according to claim 6, wherein: A first draw ratio of the first drawing is smaller than a second draw ratio of the second drawing.

8. The method for preparing the cotton-like composite yarn according to claim 7, characterized in that: The filament B has a two-component parallel three-dimensional spiral elastic structure; The first draft ratio is 0.99-1.03, and the second draft ratio is 1.01-1.

05.

9. The method for preparing the cotton-like composite yarn according to claim 6, wherein: The weight ratio of the drawn yarn A to the drawn yarn B is 1:2-3:

1.

10. The method for preparing the cotton-like composite yarn according to claim 6, wherein: The grid-connected gas pressure is 2-4 bar.

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