A lyocell hemp denim fabric

Abstract

The utility model provides a kind of lyocell hemp jeans fabric, including perspiration wet layer, moisture-permeable layer and microchannel structure, perspiration wet layer is by cotton / lyocell blended warp and lyocell / hemp blended weft yarn alternative beating weft interwoven, moisture-permeable layer is by first warp and first weft yarn alternative beating weft interwoven, first warp uses cotton / lyocell blended yarn, first weft yarn uses lyocell / hemp blended yarn, microchannel structure is set between perspiration wet layer and moisture-permeable layer and is used to guide moisture from perspiration wet layer to moisture-permeable layer flow, perspiration wet layer, microchannel structure and moisture-permeable layer are sequentially arranged from inside to outside.The utility model sets up microchannel structure between perspiration wet layer and moisture-permeable layer, guides moisture from perspiration wet layer to moisture-permeable layer flow, not only increases the wet path of fabric, is favorable to improve wet efficiency, by setting microchannel structure also can enhance air permeability, with good practicability.

Description

Technical Field

[0001] This utility model relates to the field of textile materials technology, and more specifically, to a lyocell hemp denim fabric. Background Technology

[0002] Traditional denim primarily uses pure cotton. Cotton cultivation relies on limited arable land resources, requires large amounts of water, and is dependent on pesticides and fertilizers, easily leading to soil degradation and water pollution. Pure cotton denim fabric is highly absorbent but drains slowly; it's skin-friendly but prone to shrinkage and wrinkling. The production process also presents problems such as high pollution (dyeing / washing), lacking antibacterial and quick-drying properties, making it difficult to meet modern consumers' demands for functionality and environmental friendliness. Lyocell fiber production consumes only 1 / 20th the water of cotton, uses raw materials from sustainable forests, employs a closed-loop production process, and boasts a solvent (NMMO, sodium N-methylmorpholine-N-oxide) recovery rate of up to 99%, with virtually no pollution emissions. Hemp fiber requires only 1 / 3 the water of cotton, has a short growth cycle, requires less fertilizer and pesticides, and its extensive root system helps prevent soil erosion. Denim fabric made from a blend of lyocell and hemp fibers can reduce dependence on traditional cotton, lowering water consumption and carbon emissions.

[0003] Chinese utility model patent application number CN202120306016.0 provides a unidirectional moisture-wicking knitted composite denim fabric, including an outer fabric body, an intermediate connecting layer, and a hydrophobic fleece layer, which are sequentially overlapped and connected from the outside to the inside.

[0004] While the aforementioned denim fabrics achieve durable one-way moisture wicking through structural adjustments, the middle interlayer is a polyacrylic resin or polyurethane coating. If this coating is too thick or applied entirely, it can cover the fabric's surface pores, creating a "breathing barrier" and reducing breathability. Furthermore, the coating material itself has poor breathability; polyacrylic resin typically has a lower breathability than natural fiber fabrics, further contributing to overall reduced breathability. This can make users feel stuffy, especially in hot environments. Therefore, the aforementioned denim fabrics suffer from insufficient breathability. Utility Model Content

[0005] Therefore, in order to solve the problem of insufficient breathability of existing denim fabrics, this utility model provides a lyocell hemp denim fabric, the specific technical solution of which is as follows:

[0006] A lyocell-hemp denim fabric includes a moisture-wicking layer, a moisture-absorbing and breathable layer, and a microchannel structure. The moisture-wicking layer has a twill weave structure and is made of cotton / lyocell blended warp yarns and lyocell / hemp blended weft yarns interlaced. The moisture-absorbing and breathable layer is made of a first warp yarn and a first weft yarn interlaced. The first warp yarn is made of cotton / lyocell blended yarn, and the first weft yarn is made of lyocell / hemp blended yarn. The microchannel structure is disposed between the moisture-wicking layer and the moisture-absorbing and breathable layer and is used to guide moisture from the moisture-wicking layer to the moisture-absorbing and breathable layer. The moisture-wicking layer, the microchannel structure, and the moisture-absorbing and breathable layer are arranged sequentially from the inside to the outside.

[0007] The lyocell hemp denim fabric utilizes a microchannel structure between the moisture-wicking layer and the breathable layer to guide moisture flow from the moisture-wicking layer to the breathable layer. This not only increases the moisture-wicking path and improves wicking efficiency but also enhances breathability, solving the problem of insufficient breathability in existing denim fabrics and offering excellent practicality. Furthermore, the breathable layer is woven from alternating first warp and first weft yarns. The first warp yarn is a cotton / lyocell blended yarn, and the first weft yarn is a lyocell / hemp blended yarn. Utilizing the properties of lyocell and hemp fibers, the denim fabric also possesses antibacterial, sweat-wicking, and quick-drying functions.

[0008] Preferably, the microchannel structure is a nanoscale porous fiber column, which vertically penetrates the sweat-wicking and moisture-absorbing layer and the breathable layer.

[0009] Preferably, the microchannel structure is a hollow fiber tube, which is elastic and vertically embedded between the sweat-wicking layer and the moisture-absorbing and breathable layer.

[0010] Preferably, the moisture-absorbing and breathable layer is provided with a plurality of breathable micropores, and the edges of the breathable micropores are made of shape memory polymer material.

[0011] Preferably, the sweat-wicking and moisture-wicking layer has a breathable pore structure, which includes multiple breathable pores. The inner side of the breathable pores is hydrophobic, and the outer side of the breathable pores is hydrophilic.

[0012] Preferably, the lyocell hemp denim fabric further includes a lining layer disposed on the surface of the moisture-wicking layer away from the hollow fiber tube layer.

[0013] Preferably, the proportion of lyocell yarn in the first weft yarn is 70%, and the proportion of hemp yarn in the first weft yarn is 30%.

[0014] Preferably, the lining layer is made of lyocell and hemp fibers.

[0015] Preferably, the hemp fibers of the sweat-wicking layer contain silver ion nanoparticles.

[0016] Preferably, titanium dioxide nanoparticles are provided in the lyocell fibers of the first warp yarn and the lyocell fibers of the first weft yarn. Attached Figure Description

[0017] The present invention can be further understood from the following description taken in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale; rather, the focus is on illustrating the principles of the embodiments. In different views, the same reference numerals designate corresponding parts.

[0018] Figure 1 This is a schematic diagram of the overall structure of a lyocell hemp denim fabric according to one embodiment of this utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the overall structure of a lyocell hemp denim fabric according to one embodiment of this utility model. Figure 2 .

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Sweat-wicking layer; 2. Microchannel structure; 3. Moisture-absorbing and breathable layer. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with its embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit its scope of protection.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] In this utility model, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0026] Before describing the specific embodiments of this utility model, a brief introduction to the prior art will be given first.

[0027] Hemp fibers have a relatively large hollow structure and contain hydrophilic genes, making them highly absorbent. Lyocell fibers wick away moisture quickly; together, they achieve a "sweat-wicking-quick-drying" cycle, keeping the skin dry. The absorbency and quick-drying properties are superior, with breathability about twice that of cotton and moisture wicking three times faster. The blended fabric has excellent heat dissipation, making it suitable for summer. Lyocell's surface is light, silky, soft, and skin-friendly, neutralizing the roughness of hemp, resulting in a smooth feel. Lyocell has high wet strength (retaining 85%), while hemp fibers are strong; the blended fabric has 30% improved abrasion resistance and better wrinkle resistance than pure cotton. Hemp and lyocell are naturally mildew-proof and antibacterial, blocking over 95% of UV rays and providing an instant cooling sensation upon contact. Lyocell combines the comfort of cotton, the strength of polyester, the beauty of wool, and the feel of silk. Hemp contains cannabinoids, and the dense fiber structure of lyocell inhibits bacterial growth; the blended fabric has an antibacterial rate of ≥90% (e.g., against Escherichia coli and Staphylococcus aureus). Lyocell hemp denim combines the natural advantages of both while overcoming the shortcomings of traditional pure cotton denim. Through the synergistic effect of natural fibers and innovative green processes, it addresses the pain points of traditional denim in terms of environmental friendliness and functionality. It represents an important direction for the denim industry's future transformation towards sustainable development, possessing the dual advantages of "performance enhancement" and "eco-friendliness," and is expected to become a breakthrough product in the high-end denim market.

[0028] To address the issue of insufficient breathability in existing denim fabrics, such as Figure 1 as well as Figure 2 As shown, an embodiment of this utility model provides a lyocell hemp denim fabric, including a moisture-wicking layer 1, a moisture-absorbing and breathable layer 3, and a microchannel structure 2. The moisture-wicking layer 1 adopts a twill weave structure and is formed by alternating weft knitting of cotton / lyocell blended warp yarns and lyocell / hemp blended weft yarns. The moisture-absorbing and breathable layer 3 is formed by alternating weft knitting of first warp yarns and first weft yarns. The first warp yarns are cotton / lyocell blended yarns, and the first weft yarns are lyocell / hemp blended yarns. The microchannel structure 2 is disposed between the moisture-wicking layer 1 and the moisture-absorbing and breathable layer 3 and is used to guide moisture from the moisture-wicking layer 1 to the moisture-absorbing and breathable layer 3. The moisture-wicking layer 1, the microchannel structure 2, and the moisture-absorbing and breathable layer 3 are arranged sequentially from the inside to the outside.

[0029] The microchannel structure 2 can be a nanoscale porous fiber column that vertically penetrates the sweat-wicking and moisture-wicking layer 1 and the moisture-absorbing and breathable layer 3.

[0030] Here, the "porous" in the context of the porous fiber column refers to the number of pores inside the hemp fiber cross-section when observed under a high-powered microscope; common pore counts include four, seven, and nine pores. The more pores a fiber has, the better its air permeability and fluffiness. This is because the pores store a large amount of air, and the more abundant the air content under the insulating layer conditions, the better the air permeability. Simultaneously, the more air fills the pores, the more channels for compression and rebound, thus enhancing fluffiness and softness.

[0031] Because the porous fiber columns vertically penetrate both the moisture-wicking layer 1 and the breathable moisture-absorbing layer 3, they serve two purposes: firstly, as additional rapid moisture-wicking channels, accelerating the transfer of moisture from the inner layer to the surface; and secondly, their porous structure increases the surface area of ​​the breathable moisture-absorbing layer 3, promoting rapid diffusion of moisture on the surface. Specifically, the porous fiber columns can be made of nanoscale polyacrylonitrile fiber columns, which possess excellent moisture absorption and wicking properties.

[0032] Of course, the microchannel structure 2 can also be configured as a hollow fiber tube, which is elastic and vertically embedded between the moisture-wicking layer 1 and the moisture-wicking breathable layer 3. Specifically, one end of the hollow fiber tube is connected to the moisture-wicking layer 1, and the other end is connected to the moisture-wicking breathable layer 3, forming an airflow channel. In this way, the breathability of the denim fabric can be significantly improved, allowing air to flow freely between the two layers of fabric and alleviating the stuffiness. At the same time, the hollow fiber tube can also assist in the conduction of moisture, enhancing the one-way moisture wicking effect.

[0033] In addition, the microchannel structure 2 can also be made of hydrophilic polymer material to guide moisture to be transferred quickly from the perspiration-wicking layer 1 to the moisture-absorbing and breathable layer 3 more efficiently, greatly improving the moisture wicking efficiency.

[0034] More specifically, the denim fabric has a weight range of 4-13 oz / yd. 2The corresponding weaving equipment is a rapier loom. The first warp yarn is a cotton / lyocell blend, which, through dyeing and sizing processes, has a bright color and high color yield. The first weft yarn is a lyocell / hemp blend prepared by air-jet spinning, with 70% lyocell yarn and 30% hemp yarn in the first weft yarn. The weaving process involves rapier weft insertion, with 4-14 heald frames, a weft density of 36-56 threads per inch, a reed number of 20#-68# per 2 inches, and a reed insertion count of 2 / 3 / 4 / 5. Traditional denim twill weave is used, with a 3 / 1 right-hand twill or 2 / 1 right-hand twill (the first warp yarn floats on 3 first weft yarns or the first warp yarn floats on 2 first weft yarns). The warp and weft are interwoven, and after weaving, the fabric undergoes finishing treatment. The finishing process includes singeing, desizing, and shrinking. Singing is used to remove the fuzz from the fabric surface, desizing is used to remove the sizing from the warp yarns during dyeing, and shrinking is used to give the fabric a stable shrinkage and width.

[0035] The moisture wicking (i.e., quick-drying) of the Lyocell hemp denim fabric described in this embodiment was evaluated, with the judgment based on GB / T 21655.2-2019 "Evaluation of moisture wicking and quick-drying properties of textiles - Part 2: Dynamic moisture transfer method". The final test report is shown in the table below:

[0036]

[0037] As can be seen from the table above, the moisture wicking properties of the Lyocell hemp denim fabric before and after washing both comply with GB / T 21655.2-2019.

[0038] The Lyocell hemp denim fabric was tested and evaluated for its instantaneous cooling sensation upon contact, water absorption rate at the penetration surface, and wetting time. The final test report is shown in the table below:

[0039]

[0040] As can be seen from the table above, the Lyocell hemp denim fabric passed the tests for several items, including pre-wash soaking time, post-wash soaking time, pre-wash water absorption rate, post-wash water absorption rate, pre-wash unidirectional transfer index, and pre-wash instantaneous cooling performance. All of these tests met the corresponding judgment criteria.

[0041] The lyocell hemp denim fabric incorporates a microchannel structure 2 between the moisture-wicking layer 1 and the moisture-wicking breathable layer 3. This microchannel structure guides moisture from the moisture-wicking layer 1 to the moisture-wicking breathable layer 3, increasing the moisture-wicking path and improving efficiency. Furthermore, the microchannel structure 2 enhances breathability, addressing the issue of insufficient breathability in existing denim fabrics and demonstrating excellent practicality. Additionally, the moisture-wicking breathable layer 3 is woven from alternating first warp and first weft yarns. The first warp yarn is a cotton / lyocell blended yarn, and the first weft yarn is a lyocell / hemp blended yarn. Utilizing the properties of lyocell and hemp fibers, the denim fabric also possesses antibacterial, sweat-wicking, and quick-drying functions.

[0042] As a preferred technical solution, the moisture-absorbing and breathable layer 3 is provided with a plurality of breathable micropores, and the edges of the breathable micropores are made of shape memory polymer materials (such as polyurethane, polylactone, fluorinated polymers and polynorbornene, etc.).

[0043] When humidity or temperature changes, the shape memory polymer material deforms, thereby controlling the opening, closing and size of the breathable micropores, optimizing breathability and better balancing warmth and breathability.

[0044] As a preferred technical solution, the perspiration-wicking layer 1 is provided with a breathable hole structure, the breathable hole structure includes multiple breathable holes, the inner side of the breathable hole is hydrophobic, and the outer side of the breathable hole is hydrophilic.

[0045] The ventilation holes can be created in the moisture-wicking layer 1 through laser perforation or mechanical perforation to promote air circulation between the inner layer and the outside, improve the fabric's breathability, and reduce stuffiness. Simultaneously, by making the inner side of the ventilation holes hydrophobic and the outer side hydrophilic, it also prevents moisture from seeping back through the ventilation holes.

[0046] To enhance fabric comfort, as a preferred technical solution, the lyocell hemp denim fabric further includes a lining layer disposed on the surface of the hollow fiber tube layer away from the moisture-wicking layer 1. The lining layer is made of lyocell / hemp fibers.

[0047] On the one hand, this lining layer can improve the comfort of contact with the skin and reduce the direct irritation of the skin by hemp fibers; on the other hand, its good moisture absorption can help the sweat-wicking layer 1 absorb sweat on the skin surface and transfer the sweat to the moisture-wicking and breathable layer 3 more quickly, further improving the one-way moisture-wicking performance.

[0048] As a preferred technical solution, the hemp fibers of the moisture-wicking layer 1 contain silver ion nanoparticles, which endow the moisture-wicking layer 1 with antibacterial function and prevent odor caused by the growth of bacteria due to moisture.

[0049] Titanium dioxide nanoparticles are provided in the Lyocell fibers of the first warp yarn and the Lyocell fibers of the first weft yarn to enhance the UV protection function of the moisture-wicking and breathable layer 3, expand the functionality of the fabric, and meet the diverse needs of consumers.

[0050] As a preferred technical solution, functional materials can also be added to the moisture-wicking layer 1. Specifically, temperature-sensitive or humidity-sensitive polymeric materials (such as poly(N-isopropylacrylamide), PNIPAM) can be compounded or coated with the lyocell / hemp fibers of the moisture-wicking layer 1. When the humidity is low, the polymeric material shrinks, reducing the breathability and moisture-wicking properties of the moisture-wicking layer 1, and maintaining moderate moisture on the skin surface; when the humidity increases or the body sweats, the polymeric material absorbs water and expands, opening more moisture-wicking channels, enhancing the moisture-wicking performance of the denim fabric, and achieving adaptive adjustment.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A lyocell hemp denim fabric, characterized in that, The lyocell hemp denim fabric includes a moisture-wicking layer, a moisture-wicking and breathable layer, and a microchannel structure. The moisture-wicking layer has a twill weave structure and is made of alternating cotton / lyocell warp yarns and lyocell / hemp weft yarns. The moisture-wicking and breathable layer is made of alternating first warp yarns and first weft yarns. The first warp yarn is a cotton / lyocell blended yarn, and the first weft yarn is a lyocell / hemp blended yarn. The microchannel structure is located between the moisture-wicking layer and the moisture-wicking and breathable layer and is used to guide moisture from the moisture-wicking layer to the moisture-wicking and breathable layer. The moisture-wicking layer, the microchannel structure, and the moisture-wicking and breathable layer are arranged sequentially from the inside out.

2. The Lyocell hemp denim fabric as described in claim 1, characterized in that, The microchannel structure is a nanoscale porous fiber column, which vertically penetrates the sweat-wicking and moisture-absorbing layer and the breathable layer.

3. The Lyocell hemp denim fabric as described in claim 1, characterized in that, The microchannel structure is a hollow fiber tube, which is elastic and vertically embedded between the sweat-wicking and moisture-absorbing layer and the moisture-wicking and breathable layer.

4. A lyocell hemp denim fabric as described in claim 2 or 3, characterized in that, The moisture-absorbing and breathable layer is provided with multiple breathable micropores, and the edges of the breathable micropores are made of shape memory polymer material.

5. The Lyocell hemp denim fabric as described in claim 4, characterized in that, The sweat-wicking and moisture-wicking layer has a breathable pore structure, which includes multiple breathable pores. The inner side of the breathable pores is hydrophobic, and the outer side of the breathable pores is hydrophilic.

6. The Lyocell hemp denim fabric as described in claim 5, characterized in that, The Lyocell hemp denim fabric also includes a lining layer disposed on the surface of the moisture-wicking layer away from the hollow fiber tube layer.

7. The Lyocell hemp denim fabric as described in claim 6, characterized in that, The first weft yarn contains 70% lyocell yarn and 30% hemp yarn.

8. The Lyocell hemp denim fabric as described in claim 7, characterized in that, The lining layer is made of lyocell and hemp fibers.

9. A lyocell hemp denim fabric as described in claim 8, characterized in that, The hemp fibers of the sweat-wicking and moisture-wicking layer contain silver ion nanoparticles.

10. A lyocell hemp denim fabric as described in claim 9, characterized in that, Titanium dioxide nanoparticles are contained in the Lyocell fibers of the first warp yarn and the Lyocell fibers of the first weft yarn.

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