Jacquard drag reduction fabric and its application

Abstract

This invention relates to a jacquard drag-reducing fabric and its application. The jacquard drag-reducing fabric includes a body area and a jacquard area. The jacquard area has multiple jacquard patterns protruding from the body area. The jacquard patterns are formed by splicing together n types of polygons with at least one side adjacent, where the number of side lengths of the polygons is i, and n≥2, i≥3. The jacquard drag-reducing fabric is used to prepare drag-reducing swimwear. Compared with the prior art, this invention provides a composite pattern jacquard drag-reducing fabric, which enhances the fabric surface's ability to control fluid eddy current behavior by enriching the jacquard and recessed structures, thereby better improving the drag-reducing effect of the fabric in real-world application scenarios.

Description

Technical Field

[0001] This invention relates to the field of functional fabric technology, and in particular to a jacquard drag-reducing fabric and its applications. Background Technology

[0002] With the continuous development of competitive sports, high-tech sports equipment is also constantly being updated, and drag reduction technology is one of them. Drag-reducing clothing can perfectly wrap around the body surface, reducing the frictional resistance between the body contours and external fluids during exercise, thus achieving drag reduction. The drag reduction effect largely depends on the fabric of the sportswear; the lower the coefficient of friction of the fabric, the better the drag reduction effect, and the less resistance encountered during exercise, thereby helping athletes improve their speed and performance.

[0003] Swimming has a long history and ranks second only to track and field in terms of medal count among major sporting events, effectively showcasing the competitive athletic level of a team or country. In the early days of swimming, swimsuits were made of cotton plain weave and rib knit fabric, which were loose and easily trapped water, creating significant resistance during swimming and greatly limiting the speed of athletes.

[0004] Currently, athletes reduce drag by standardizing gliding posture, adjusting breathing, controlling head position, and adjusting body shape. On the other hand, using drag-reducing fabrics in swimsuits can reduce fluid resistance by 5-10%, effectively improving athletic performance. High-tech drag-reducing fabrics from abroad employ unique texture structures that manage fluid vortex behavior to reduce underwater drag, significantly improving performance. However, this high-tech fabric market is currently largely monopolized by foreign companies. Chinese invention patent CN 114836893A discloses a warp-knitted jacquard fabric with drag-reducing pits. However, the jacquard pattern of this fabric is limited and cannot meet the drag-reduction needs of athletes at varying speeds. Athletes have different swimming speeds at different stages of a swimming race (e.g., start, steady pace, final sprint). If the athlete's speed or the surrounding water flow changes, the fabric surface's ability to regulate fluid vortices changes, affecting the theoretical drag-reduction effect and significantly impacting the athlete's performance. Summary of the Invention

[0005] The purpose of this invention is to provide a jacquard drag-reducing fabric and its application, so as to better improve the drag-reducing effect of the fabric in real application scenarios.

[0006] The objective of this invention can be achieved through the following technical solution: a jacquard drag-reducing fabric, comprising a body area and a jacquard area, wherein the jacquard area is provided with a plurality of jacquard patterns protruding from the body area, wherein the jacquard patterns are formed by splicing together n polygons with at least one side adjacent, wherein the number of side lengths of the polygons is i, where n≥2 and i≥3.

[0007] Preferably, the jacquard pattern is designed based on the development of Archimedes' polyhedron.

[0008] Preferably, the jacquard pattern is composed of regular pentagons and regular decagons.

[0009] More preferably, the jacquard pattern is formed by repeating ten regular pentagons with one side of each decagon being the side length of the pentagon.

[0010] Preferably, the jacquard pattern is composed of squares and regular octagons.

[0011] More preferably, the jacquard pattern repeats from two regular octagons joined together along their longitudinal sides and four squares joined together with the diagonal sides of the regular octagons.

[0012] Preferably, the jacquard pattern is composed of rhombuses and regular hexagons.

[0013] More preferably, six regular hexagons are bonded together in pairs to form a honeycomb pattern, and rhombuses fill the gaps formed by every two regular hexagons. The final repeating unit of the jacquard pattern is a complete regular hexagon with a side length three times that of the polygon.

[0014] Preferably, the jacquard pattern is composed of squares, rhombuses, and regular hexagons.

[0015] More preferably, the regular hexagons and squares are connected by one side in a random manner, and the remaining parts of the pattern are finally filled by rhombuses.

[0016] Preferably, the jacquard pattern consists of two rhombuses of different sizes and a rectangle.

[0017] More preferably, the large rhombuses and rectangles are connected with their long sides adjacent to each other, and the small rhombuses fill in the empty parts of the pattern.

[0018] Preferably, both the body area and the jacquard area are woven from nylon-over-spandex machine-knitted yarn.

[0019] More preferably, in the nylon-over-spandex machine-wrapped yarn, the linear density of nylon is 10-70D, the number of holes is 5-48F, the linear density of spandex is 5-70D, the elongation ratio of the covered yarn is 1.0-3.0, and the twist is 500-1200 twists / m.

[0020] More preferably, the nylon in the nylon-over-spandex machine-made covering yarn used in the body region has a linear density of 30D and a hole count of 24F, the spandex has a linear density of 20D, the covering yarn has an elongation ratio of 2.6, and a twist of 800 twists / m.

[0021] More preferably, the linear density of the nylon in the nylon-over-spandex machine-wrapped yarn used in the jacquard area is 40D, and the number of holes is 12F.

[0022] Preferably, the height of the jacquard pattern is 0.1-2.0 mm.

[0023] Preferably, the side length of the polygon is 0.5-2.0 cm.

[0024] Preferably, the jacquard width of each side of the polygon is 0.1-0.3cm.

[0025] Preferably, the body area adopts a plain weave structure, and the jacquard area is composed of a weft-knitted jacquard structure.

[0026] This invention utilizes a nylon-over-spandex weaving machine to provide the main structure for the fabric. Nylon yarn is then used in a weft-knitting jacquard process to construct a ridge-shaped raised jacquard structure, thereby forming a groove structure on the fabric body. This provides the spatial structural conditions for controlling the morphology of fluid vortices. Because the fabric body has ridge-shaped jacquard protrusions, it forms groove structures with different polygonal shapes, thus reducing drag. The specific drag-reduction principle is as follows: the continuous, regular, and unequal-sized combined jacquard pattern can use the grooves to lift the vortices, causing them to remain above the groove ridges. This reduces the lateral migration of the vortices, weakens the suddenness, entanglement, and turbulence outside the boundary layer, and reduces the velocity gradient and velocity pulsation within the grooves, thereby reducing the wall shear stress.

[0027] An application of the above-mentioned jacquard drag-reducing fabric is to use the jacquard drag-reducing fabric to prepare drag-reducing swimwear.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. This invention provides a composite patterned jacquard drag-reducing fabric, which enhances the fabric surface's ability to control fluid eddy current behavior by enriching the jacquard and recessed structure, thereby better improving the drag-reducing effect of the fabric in real application scenarios.

[0030] 2. Due to the variability in resistance caused by different body shapes or states of the external environment (air, water flow, etc.) encountered by the fabric, the regulation of fluid eddies on the fabric surface will change, affecting the theoretical drag reduction effect. Therefore, this invention designs a combination of jacquard patterns on the surface of the drag-reducing fabric, and introduces grooves with appropriate eddy structures of different scales to reduce eddy drag and achieve the drag reduction effect.

[0031] 3. This invention provides jacquard pattern designs based on different size ratios of the Archimedes polyhedron development diagram to reduce the different wall friction resistance generated by the interaction between the fabric surface and the fluid, thereby achieving the effect of drag reduction;

[0032] 4. The patterned jacquard involved in this invention enriches the control of fluid vortex behavior on the fabric surface by constructing surface pits and jacquard structures of different sizes and depths. Its structure can form multi-scale vortices on the fabric surface to adapt to drag reduction requirements under complex water flow conditions. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of a jacquard design composed of regular pentagons and regular decagons in this invention.

[0034] Figure 2 This is a schematic diagram of a jacquard design composed of regular squares and regular octagons in this invention.

[0035] Figure 3 This is a schematic diagram of a jacquard design composed of regular rhombuses and regular hexagons in this invention.

[0036] Figure 4 This is a schematic diagram of a jacquard design composed of regular squares, rhombuses, and regular hexagons in this invention.

[0037] Figure 5 This is a schematic diagram of a jacquard design in this invention, consisting of two types of regular rhombuses and rectangles of different sizes.

[0038] In the diagram: A, body area; B, jacquard area. Detailed Implementation

[0039] A weft-knitted single-sided jacquard fabric with drag-reducing recesses; the specific production steps of the fabric are as follows:

[0040] S1 Warping: First, pre-humidification treatment is carried out. The raw materials are first stored in a constant temperature and humidity environment of 24℃±2℃ and 55-70% for 48 hours. Then, a certain number of yarn packages are wound parallel on the warp beam or weaving beam with appropriate and uniform tension according to the length, width and arrangement order specified in the process design, for use in the sizing or warping process. The environmental conditions require the following indoor temperature: spring and summer: 24℃±2℃, autumn and winter: 23℃±2℃, relative humidity: 55-70%, to ensure the quality of the fabric.

[0041] S2: The raw material after segmented warping is first woven into plain weave on an HKS 2-SE PLUS warp knitting machine, while the jacquard part is woven on an S8-41200 single-sided computer-selected needle jacquard loom with a cylinder diameter of 30”-38” and a diameter of E20-E28 HK-SJK.

[0042] S3: Finish the woven fabric by washing and desizing, drying, impregnation with a hydrophobic agent, and high-temperature setting.

[0043] The specific operation of warping in step S1 is as follows: the nylon-over-spandex machine-wrapped FDY raw material is warped in sections on the warping machine according to 8 warping heads per set. The warping tension is controlled at 7-15cN and the warping draft ratio is 60-80%. The yarn length is 14.3-17.6cm / 100 stitches.

[0044] In step S2, during weaving, the fabric density is (250-340)×(270-380) threads / 10cm, the crimp density is 32-46 / CM, the machine speed is 1500-2000rpm, and the fabric roll width is 120-160cm.

[0045] As mentioned above, the drag-reducing performance of the drag-reducing fabric was measured through a water tunnel experiment. Specifically, a drag-reducing fabric was wrapped around the surface of a cylindrical waterproof sandbag (simulating human muscle, which can deform under the impact of water flow). The waterproof sandbag was connected to a data acquisition system and a pressure sensor. The drag resistance of the drag-reducing fabric was tested under a water flow speed of 100 m / min (referencing the men's 1500m freestyle world record), and the corresponding drag test value was obtained. Compared with the drag test value of the cylindrical waterproof sandbag without fabric wrapping under the same water flow speed, the drag-reducing performance of the swimsuit fabric was calculated using formula (1).

[0046]

[0047] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0048] Example 1

[0049] like Figure 1 As shown, this invention discloses a patterned jacquard design for a jacquard drag-reducing fabric based on the Archimedes polyhedron unfolding diagram. The jacquard pattern of the fabric consists of regular pentagons and regular decagons. Specifically, ten regular pentagons are used as repeating units, with one side of each decagon fitting to the side length of the decagon. The side lengths of the pentagons and decagons are both 1.0 cm, the jacquard width is 0.2 cm, and the jacquard height is 0.5 mm.

[0050] The fabric consists of a main fabric area A and a jacquard area B. The main fabric area adopts a plain weave structure, while the jacquard area is composed of a weft-knitted jacquard structure. The jacquard area has multiple ridge-shaped raised areas B. The main fabric area consists of two yarns, warp and weft, interwoven by a plain weave process. Both yarns are nylon-over-spandex machine-covered yarns of specific specifications. The jacquard area consists of nylon yarns woven by a weft knitting process.

[0051] The nylon yarn used in the main body section has a linear density of 30D / 24F and a linear density of 20D. The elongation ratio of the covering yarn is 2.6, and the twist is 800 twists / m. The linear density of the nylon yarn used in the jacquard section is 40D / 12F.

[0052] The drag-reducing fabric in this embodiment has a drag-reducing performance that is 12.5% ​​higher than that of professional drag-reducing fabrics from abroad.

[0053] Example 2

[0054] like Figure 2 As shown, this invention discloses a surface patterned jacquard design for a jacquard drag-reducing fabric based on the Archimedes polyhedron unfolding diagram. The jacquard pattern of the fabric consists of squares and regular octagons. Specifically, two regular octagons are joined together along their longitudinal edges, and four squares are joined together with the diagonal edges of the regular octagons as repeating units. The side lengths of the regular octagons and squares are both 0.6 cm, the jacquard width is 0.2 cm, and the jacquard height is 0.8 mm.

[0055] The fabric consists of a main fabric area A and a jacquard area B. The main fabric area adopts a plain weave structure, while the jacquard area is composed of a weft-knitted jacquard structure. The jacquard area has multiple ridge-shaped raised areas B. The main fabric area consists of two yarns, warp and weft, interwoven by a plain weave process. Both yarns are nylon-over-spandex machine-covered yarns of specific specifications. The jacquard area consists of nylon yarns woven by a weft knitting process.

[0056] The nylon yarn used in the main body section has a linear density of 30D / 24F and a linear density of 20D. The elongation ratio of the covering yarn is 2.6, and the twist is 800 twists / m. The linear density of the nylon yarn used in the jacquard section is 40D / 12F.

[0057] The drag-reducing fabric in this embodiment has a drag-reducing performance that is 12% higher than that of professional drag-reducing fabrics from abroad.

[0058] Example 3

[0059] like Figure 3As shown, this invention discloses a surface patterned jacquard design for a jacquard drag-reducing fabric based on the Archimedes polyhedron unfolding diagram. The jacquard pattern of the fabric consists of rhombuses and regular hexagons. Specifically, six regular hexagons are bonded together in pairs to form a honeycomb pattern. Rhombuses fill the gaps formed by every two regular hexagons, and the final repeating unit is a complete regular hexagon with sides three times the length of the polygon. The side lengths of the rhombuses and regular hexagons are both 0.8 cm, the jacquard width is 0.2 cm, and the jacquard height is 1.0 mm.

[0060] The fabric consists of a main fabric area A and a jacquard area B. The main fabric area adopts a plain weave structure, while the jacquard area is composed of a weft-knitted jacquard structure. The jacquard area has multiple ridge-shaped raised areas B. The main fabric area consists of two yarns, warp and weft, interwoven by a plain weave process. Both yarns are nylon-over-spandex machine-covered yarns of specific specifications. The jacquard area consists of nylon yarns woven by a weft knitting process.

[0061] The nylon yarn used in the main body section has a linear density of 30D / 24F and a linear density of 20D. The elongation ratio of the covering yarn is 2.6, and the twist is 800 twists / m. The linear density of the nylon yarn used in the jacquard section is 40D / 12F.

[0062] Example 4

[0063] like Figure 4 As shown, this invention discloses a surface patterned jacquard design for a jacquard drag-reducing fabric based on the Archimedes polyhedron unfolding diagram. The jacquard pattern of the fabric consists of squares, rhombuses, and regular hexagons. Specifically, the regular hexagons and squares are connected by a single side in a random manner, and the remaining parts of the pattern are filled with rhombuses. The side length of the squares, rhombuses, and regular hexagons is 1.0 cm, the jacquard width is 0.3 cm, and the jacquard height is 1.5 mm.

[0064] The fabric consists of a main fabric area A and a jacquard area B. The main fabric area adopts a plain weave structure, while the jacquard area is composed of a weft-knitted jacquard structure. The jacquard area has multiple ridge-shaped raised areas B. The main fabric area consists of two yarns, warp and weft, interwoven by a plain weave process. Both yarns are nylon-over-spandex machine-covered yarns of specific specifications. The jacquard area consists of nylon yarns woven by a weft knitting process.

[0065] The nylon-over-spandex machine-wrapped yarn used in the main body area has a linear density of 30D / 24F for nylon and 20D for spandex. The elongation ratio of the covered yarn is 2.6, and the twist is 800 twists / m. The linear density of the nylon yarn used in the jacquard section is 40D / 12F.

[0066] The drag-reducing fabric in this embodiment has a drag-reducing performance that is 15% higher than that of professional drag-reducing fabrics from abroad.

[0067] Example 5

[0068] like Figure 5 As shown, this invention discloses a surface patterned jacquard design for a jacquard drag-reducing fabric based on the Archimedes polyhedron unfolded diagram. The jacquard pattern of the fabric consists of two rhombuses of different sizes and a rectangle. Specifically, the large rhombuses and the rectangle are connected with their long sides adjacent to each other, and the small rhombuses fill in the empty parts of the pattern. The large rhombuses have a side length of 2.0 cm, the small rhombuses have a side length of 1.0 cm, the rectangle has a long side of 2.0 cm and a short side of 1.0 cm, the jacquard width is 0.2 cm, and the jacquard height is 1.2 mm.

[0069] The fabric consists of a main fabric area A and a jacquard area B. The main fabric area adopts a plain weave structure, while the jacquard area is composed of a weft-knitted jacquard structure. The jacquard area has multiple ridge-shaped raised areas B. The main fabric area consists of two yarns, warp and weft, interwoven by a plain weave process. Both yarns are nylon-over-spandex machine-covered yarns of specific specifications. The jacquard area consists of nylon yarns woven by a weft knitting process.

[0070] The nylon-over-spandex machine-wrapped yarn used in the main body area has a linear density of 30D / 24F for nylon and 20D for spandex. The elongation ratio of the covered yarn is 2.6, and the twist is 800 twists / m. The linear density of the nylon yarn used in the jacquard section is 40D / 12F.

[0071] The drag-reducing fabric in this embodiment has a drag-reducing performance that is 14.5% higher than that of professional drag-reducing fabrics from abroad.

[0072] CN114836893A discloses a warp-knitted jacquard fabric with drag-reducing pits. The pit pattern, used to control turbulent water behavior and achieve drag reduction, is a single, regular quadrilateral. The final drag-reduction performance of this fabric is only 10% higher than that of professional drag-reducing fabrics from abroad. Compared to CN114836893A, the present invention, in terms of jacquard pattern design, uses a pit pattern composed of multiple polygons to meet the drag-reduction needs of athletes under varying speeds. The final drag-reduction performance of the fabric designed in this invention is 12%-15% higher than that of professional drag-reducing fabrics from abroad.

[0073] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A jacquard drag reduction fabric, characterized in that, It includes a body area and a jacquard area. The jacquard area is the edge of a polygon. The jacquard area has multiple jacquard patterns protruding from the body area. The jacquard patterns are spliced ​​together based on n polygons with at least one side adjacent. The number of side lengths of the polygons is i, where n≥2 and i≥3. The jacquard width of each side of the polygon is 0.1-0.3cm. Both the body area and the jacquard area are woven from nylon-over-spandex machine-wrapped yarn; the linear density of nylon in the nylon-over-spandex machine-wrapped yarn is 10-70D, the number of holes ranges from 5-48F, the linear density of spandex is 5-70D, the elongation ratio of the covering yarn is 1.0-3.0, and the twist is 500-1200 twists / m; The height of the jacquard pattern is 0.1-2.0 mm; the side length of the polygon is 0.5-2.0 cm; The main body area adopts a weft-knitted plain knit structure, while the jacquard area is composed of a weft-knitted jacquard structure.

2. The jacquard drag reduction fabric of claim 1, wherein, The nylon in the nylon-over-spandex machine-made covering yarn used in the main body area has a linear density of 30D and a hole count of 24F, while the spandex has a linear density of 20D. The elongation ratio of the covering yarn is 2.6, and the twist is 800 twists / m.

3. The jacquard drag reduction fabric of claim 1, wherein, The linear density of nylon in the nylon-over-spandex machine-wrapped yarn used in the jacquard area is 40D, and the number of holes is 12F.

4. Use of a jacquard drag reducing fabric according to any one of claims 1 to 3, characterized in that, The jacquard drag-reducing fabric is used to prepare drag-reducing swimwear.

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