A type of light-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure and its weaving process

Abstract

The present invention relates to the technical field of knitting, and specifically to a type of photothermal conversion spacer fabric with a surface light-trapping structure imitating butterfly wings and its weaving process, including several loop structures, each of which includes a surface layer, an inner layer, and a connecting layer connecting the surface layer and the inner layer. The surface layer and the inner layer are both woven with yarn mixed with hot-melt yarns in a plain weft stitch, and the connecting layer is woven with yarns. The weaving method of the connecting layer is to weave a 1+1 rib structure on the front and back needle beds to 1 / 2 of the required height, weave a single layer of rib to connect the two sections of fabric, and select needles every other time to weave back to the weaving point, which is a basic cycle. The fabric of the present invention is formed by flat knitting yarns and hot-melt yarns. The new bionic knitting developed in combination with the structural characteristics of butterfly scales in nature has a three-dimensional structure. The spacer fabric contains a large amount of static air, and the fabric has excellent thermal insulation performance. It also has the characteristics of moisture absorption and breathability, energy absorption and buffering, and can meet the needs of functional fabrics in different fields.

Description

Technical Field

[0001] The present invention relates to the technical field of knitting, and in particular to a type of light-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure and a weaving process thereof. Background Art

[0002] The light-trapping structure of butterfly wings and its principle of heat-conversion and insulation are applied to fabrics and combined with a three-dimensional spacer structure to create a three-dimensional tubular fabric. Compared to plain weave fabrics, tubular fabrics have larger interlayer gaps when flattened, allowing for more still air and a lower heat transfer coefficient, resulting in better insulation. In the inflated state, insulation is further enhanced. In-depth research into the fabric's heat transfer properties has led to the development of a highly insulating fabric.

[0003] Current research focuses on improving the thermal insulation properties of fabrics through physical or chemical modification of fibers, yarn blending or compounding, fabric structure coordination, and various finishing techniques. For example, patent application number CN201410396085.X discloses a polyurethane elastic fiber with thermal insulation properties and its preparation method, which are particularly suitable for use in fabrics such as winter underwear, knee pads, wrist guards, and belts. Nano-scale ceramic powder is mixed with the polyurethane fibers as a thermal insulation additive. The ceramic powder's ability to block and reflect thermal radiation reduces heat loss. The thermal insulation function relies on treating each layer of fabric with a functional additive, but the durability and washability of these additives are poor, and their thermal insulation performance decreases with age. Patent application number CN202111475090.6 discloses a heated, temperature-sensitive kneepad, comprising a kneepad body, an embedded functional bag, and a controller. The embedded functional bag is removably attached to the kneepad body and includes a heating device electrically connected to the controller. It has certain heating and warmth retention properties, but the multi-layer structure has low production efficiency, the design of the embedded functional bag lacks lightness, is not conducive to wearing comfort, is not conducive to long-term use, and the fabric cannot be formed in one go. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a type of photothermal conversion spacer fabric that imitates the light-trapping structure on the surface of butterfly wings. The new bionic knitted spacer fabric developed by combining the structural characteristics of butterfly scales in nature has a three-dimensional structure and contains a large amount of static air. The fabric has excellent heat storage performance and also has the characteristics of moisture absorption, breathability, energy absorption and buffering, which can meet the needs of functional fabrics in different fields.

[0005] The second purpose of the present invention is to provide a weaving process for a type of photothermal conversion spacer fabric with a light-trapping structure imitating butterfly wings. The process is simple, the one-time molding production efficiency is high, and it effectively overcomes the problems of traditional thermal insulation fabrics being thick, stuffy, and complex to weave, and is suitable for use in thermal insulation knitted products.

[0006] The solution adopted by the present invention to achieve one of the purposes is: a type of light-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure, including a plurality of cycle structures, each of which includes a surface layer, an inner layer and a connecting layer connecting the surface layer and the inner layer, the surface layer and the inner layer are both woven with yarn mixed with thermal fusible yarns, the connecting layer is woven with yarn, and the knitting method of the connecting layer is to knit a 1+1 rib structure with a desired height on the front and back needle beds. At the point where two sections of fabric are connected, a single layer of rib is knitted, and the needles are selected every other time to knit back to the knitting point, which is a basic cycle.

[0007] Preferably, the structure of the light-to-heat conversion spacer fabric imitating the butterfly wing surface light-trapping structure is at least one of a honeycomb concave structure, a striped groove structure, and a grid pit structure.

[0008] The honeycomb concave structure only extracts closely arranged rectangular geometric structures as the spacing structure, assuming that the honeycombs are of equal size and evenly spaced; the striped groove structure has a surface depression in the form of rectangular columns that are the linear ridges of butterfly scales, and the middle layer triangular prisms are spacing protrusions that run across the ridges. The tops of the triangular prism protrusions are flush with the tops of the striped columns, and the triangular prism protrusions are evenly arranged and all run across the spacing area; the grid pit structure has a striped rectangular column that is a longitudinal linear ridge, and a transverse spacing depression along the ridge direction. The striped rectangular column has a certain width and a height difference with the concave holes, so the spacing structure is simplified to a trapezoidal structure that is evenly arranged and runs across the middle layer.

[0009] Preferably, the geometric structures of the scales of three typical butterflies represented by Papilio leucopsis, Papilio viridis, and Papilio glaucopsis are 3D modeled using SolidWorks software, and the scales are simplified and extracted into the three structures.

[0010] Preferably, the yarns used for the surface layer, inner layer and connecting layer are any one of cotton, polyester, polyester-cotton blended yarn and cashmere yarn.

[0011] Preferably, the thermal fuse thread is a nylon thermal fuse thread or a polyester thermal fuse thread.

[0012] Preferably, the outer and inner layers are both made of double-strand 13 tex×2 cashmere yarn mixed with nylon hot-melt yarn woven plain weft stitch, and the connecting layer is woven only with cashmere yarn.

[0013] Preferably, the yarn density of the surface and inner layers is 13tex×2, 150D / 3 hot melt thread is inserted, and the yarn density of the connecting layer is 13tex×2.

[0014] The solution adopted by the present invention to achieve the second purpose is: a weaving process of the light-heat conversion spacer fabric with the butterfly wing-like surface light-trapping structure,

[0015] Weaving is done according to the specific structure, the specific method is as follows;

[0016] A. When it is a honeycomb concave structure, the weaving steps are:

[0017] A1, the first row of knitting, the front and rear needle beds knit the weft plain stitch respectively, reaching the height H1, at this time the front and rear needle beds are at points S1 and S2;

[0018] A2, the second row of fabric is knitted on the front and rear needle beds. Select needles 1 at a time and knit L1 and L2 alternately on the front and rear needle beds until the length reaches half of the connecting layer.

[0019] A3, row 3 at the connection layer height A single layer of rib is woven to connect L1 and L2;

[0020] A4, row 4, select needle 1 every other knit 3 turns L1', L2', return to S1, S2 points, this is a basic cycle;

[0021] A5, the 5th row is the starting knitting of the next cycle;

[0022] B. When it is a stripe groove structure, the weaving steps are:

[0023] B1, knit the plain surface layer R1 and the inner layer R2 on the front and back needle beds respectively, reaching the required height H1. At this time, the front and back needle beds are S1 and S2;

[0024] B2, knit only the front needle bed, row 1, and reach height H2. At this time, the front needle bed reaches point S3, and the rear needle bed is S2;

[0025] B3, row 2, knit a set of plain stitches on the front and back needle beds as the connecting stitches between the surface layer and the connecting layer;

[0026] B4, row 3, select needle 1 on the front and back needle beds and knit L1 and L2 alternately, until the length of the connecting layer reaches half;

[0027] B5, row 4, knit rib structure at the junction of L1 and L2 to connect the middle layer knitted on the front and back needle beds;

[0028] B6, row 5, select needle 1 on the front and rear needle beds and knit L1′ and L2′ alternately for 3 turns, so that they return to points S2 and S3;

[0029] B7, row 6, knit the lower surface layer R2 on the back needle bed, knitting length H2, so that the knitting point on the back needle bed reaches S4 from S2;

[0030] B8, row 7, knit plain stitches on the front and back needle beds as the connecting stitches between the surface layer and the connecting layer, repeat steps B3-B6, and finally return to S3 and S4;

[0031] The above steps are a basic cycle;

[0032] C. When it is a grid pit type structure, the weaving steps are:

[0033] C1, the front and rear needle beds knit the plain surface layers R1 and R2 respectively, reaching the required height H1. At this time, the front and rear needle beds are located at points S1 and S2;

[0034] C2, knitting the first row, the front needle bed knitting height reaches H2, at this time the front needle bed S1 reaches point S4;

[0035] C3, knitting the second row, the rear needle bed knits the surface layer of R2 to the height H3, at this time the rear needle bed reaches S3 from S2;

[0036] C4, row 3, knit a set of plain stitches on the front and back needle beds as the connecting stitches between the surface layer and the connecting layer;

[0037] C5, the 4th row of middle layer structure connection, select 1 needle every other needle on the front and back needle beds to knit L1 and L2 alternately, reaching half of the length of the connection layer;

[0038] C6, row 5: knit rib structure at the junction of L1 and L2 to connect the middle layer knitted on the front and back needle beds;

[0039] C7, row 6, select needles 1 at a time on the front and rear needle beds and knit L1′ and L2′ alternately for 3 turns, returning to points S3 and S4;

[0040] C8, the front needle bed knits rows 7-8, and the front needle bed moves from point S4 to point S5, so that the fabric height reaches H3;

[0041] C9, knit on the back needle bed, so that S3 reaches S6, knit rows 9-12, and finally the starting point of the second bevel of the connecting layer reaches S5 and S6;

[0042] The above steps are a basic cycle;

[0043] (2) After weaving, the two layers of surface fabric are reinforced with hot melt thread in the weft direction. The ironing effect is very good, and the thickness of the entire connecting layer is uniform and solid: the plain stitch is knitted alternately on the front and back needle beds. Secondly, hot melt thread is knitted on the front and back needle beds. In order to avoid the hot melt thread being too long, a certain interval is selected to make a tuck process on the knitting needle. Finally, step 1 and step 2 are knitted alternately to achieve the required height.

[0044] Preferably, a Cixing GE-52C fully computerized flat knitting machine is used for knitting, and the fabric uses a No. 7 needle, wherein the honeycomb concave structure and the grid pit structure are set to 50 counts and 66 turns, and the stripe groove structure is set to 49 counts and 39 turns.

[0045] The present invention has the following advantages and beneficial effects:

[0046] The photothermal conversion spacer fabric with a butterfly wing-like surface light-trapping structure of the present invention is formed by weaving yarn and thermo-fusible yarn horizontally. Since the fabric is a double-layer fabric, and the surface and inner layers are single-layer ribs, and the single-layer ribs are easy to bend and have no support, which will destroy the original spatial structure of the spacer, the two layers of surface fabric yarns are lined with thermo-fusible yarns in the latitude direction for reinforcement. The new bionic knitted fabric developed in combination with the structural characteristics of butterfly scales in nature has a three-dimensional structure and contains a large amount of static air. The fabric has excellent thermal insulation performance and also has the characteristics of moisture absorption, breathability, energy absorption and buffering, which can meet the needs of functional fabrics in different fields.

[0047] The present invention's light-heat conversion spacer fabric, featuring a butterfly-wing-like surface light-trapping structure, boasts a thermal insulation rate exceeding 45% and excellent breathability. Its one-step knitting process allows for diverse structures and simplified production. Furthermore, the fabric boasts a lightweight double-layer material and high production efficiency. This effectively overcomes the issues of traditional thermal insulation fabrics, such as their heaviness, heat retention, and complex weaving, making it suitable for use in thermal knitted products. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The following are scanning electron microscope images of three types of butterflies: a is the blue swallowtail butterfly, b is the green-banded swallowtail butterfly, and c is the glass butterfly;

[0049] Figure 2 The geometric modeling diagrams of three types of butterfly scales, among which a is a honeycomb concave structure, b is a striped groove structure, and c is a grid pit structure;

[0050] Figure 3 The three structures are formed and knitted in diagrams, where a is a honeycomb concave structure, b is a stripe groove structure, and c is a grid pit structure.

[0051] Figure 4 The weaving step of inserting thermal fuse into the surface layer. DETAILED DESCRIPTION

[0052] For a better understanding of the present invention, the following examples are provided to further illustrate the present invention, but the present invention is not limited to the following examples.

[0053] The fabrics of the present invention are based on three-dimensional modeling of the geometric structures of three types of butterfly scales using SolidWorks software. Based on the model characteristics, three types of knitted fabrics imitating butterfly scale structures were developed on a fully automatic computerized flat knitting machine using cashmere yarn blended with nylon thermo-fusible yarn (other yarn and thermo-fusible yarn types may also be used in other embodiments). The fabrics comprise several loops, each of which is divided into a face, back, and connecting layer. Both the face and back layers utilize a two-ply 13 tex x 2 cashmere yarn blended with nylon thermo-fusible yarn in a plain weft stitch. The connecting layer is knitted using only cashmere yarn. The connecting layer is knitted using a 1+1 rib stitch knitted on the front and back needle beds to the desired height. At the point where the two fabrics are connected, a single layer of rib is knitted; and the needles are selected every other time to knit back to the knitting point; this is a basic cycle.

[0054] The specific weaving process of the fabric comprises the following steps:

[0055] (1) If Figure 1 As shown in the figure, three typical butterfly scales represented by Papilio leucopsis, Papilio emeraldus, and Papilio glaucopsis were selected for research:

[0056] The wing veins of Type I Papilio phasmoides scales have multiple rows of sunken hole-like micro-vein structures. The wing vein structure between the ridges on the shell of this type of scales is composed of micro-veins that look like multiple closely arranged honeycomb-like uneven holes. The Type I structure is called a honeycomb sunken type structure.

[0057] The bright scale veins of the forewings of the Type II Green-banded Swallowtail Butterfly have concave-convex micro-vein structures, and the free edges of the scales are regularly shaped, mostly with two-tooth structures, and the scales are distributed with longitudinal ridges parallel to each other. The Type II structure is called a striped groove structure.

[0058] The scales of Type III Gladiola are distributed with parallel longitudinal ridges and transverse ribs, and the layout of the ridges is relatively dense. A single scale of Gladiola has a groove vertically connecting two ridges. The Type III structure is called a grid pit type structure.

[0059] (2) If Figure 2 As shown, to simplify fabric development, SolidWorks software was used to 3D model the geometric structures of three types of butterfly scales:

[0060] For the type I honeycomb concave structure 3D model, only closely packed rectangular geometric structures are extracted for modeling, assuming that the honeycombs are of equal size and evenly spaced;

[0061] Three-dimensional model of type II striped groove structure, in which the strip rectangular columns are the linear ridges of the butterfly scales, and the triangular prisms are the interval protrusions that run across the ridges. The top of the triangular prism protrusion is flush with the top of the strip rectangular column. To simplify the model, it is assumed that the triangular prism protrusions are evenly arranged and all run across the interval area.

[0062] The three-dimensional model of the Class III grid pit-type structure, in which the strip-shaped rectangular columns are longitudinal linear ridges, and the transverse intervals along the ridge direction are concave. The strip-shaped rectangular columns have a certain width and a height difference with the concave holes. Therefore, the model is simplified to trapezoidal parts that are evenly arranged and all transverse the interval area.

[0063] (3) If Figure 3 As shown, the weaving process

[0064] Type I honeycomb recessed structure:

[0065] First, knit 7 turns of double-layer weft plain needles to avoid curling and unraveling. In the first row, the front and rear needle beds knit 7 turns of weft plain needles respectively to reach the height H1. At this time, the front and rear needle beds are at S1 and S2 points. In the second row, the front and rear needle beds knit L1 and L2 in turn with 1 needle selected at the front and rear needle beds, reaching half of the length of the connecting layer, that is, the front and rear needle beds knit 3 turns. In the third row, at the height of the connecting layer, At point Q, knit a single layer of ribbing to connect L1 and L2; in row (4), select needle 1 every other time and knit L1′ and L2′ three times in turn, and return to points S1 and S2; this is a basic cycle, and row (5) is the starting point of the next cycle.

[0066] The fabric width is fixed;

[0067] H1: The length of the surface and inner layers of the fabric knitted by the front and back needle beds;

[0068] S1: the starting point of the front needle bed knitting connection layer;

[0069] S2: starting point of the back needle bed knitting connection layer;

[0070] L1: front needle bed knitting connection layer length = L1′: front needle bed knitting length after connection at point Q;

[0071] L2: Length of the back needle bed knitting connection layer = L2′: Length of the back needle bed knitting after connection at point Q;

[0072] (L1=L2=1 / 2 the height of the middle layer);

[0073] Point Q: Connect L1 and L2.

[0074] Type II stripe groove structure:

[0075] 1) Knit the plain surface layer R1 and the inner layer R2 on the front and back needle beds respectively to the required height H1. At this time, the front and back needle beds are S1 and S2;

[0076] 2) Only knit the front needle bed, row (1), and the length of the surface layer can be adjusted by adjusting the number of rows of R1. The current needle bed knits 10 turns, and the height H2 reaches 2.5 cm. At this time, the front needle bed reaches point S3, and the rear needle bed is S2;

[0077] 3) In row (2), knit a set of plain stitches on the front and back needle beds as the connecting stitches between the surface layer and the connecting layer;

[0078] 4) In row (3), select needle 1 on the front and rear needle beds and knit L1 and L2 alternately until the length of the connecting layer reaches half, i.e., the front and rear needle beds knit 3 turns;

[0079] 5) In row (4), knit a rib at point Q to connect the middle layers knitted on the front and back needle beds;

[0080] 6) In row (5), select needles 1 at a time on the front and rear needle beds and knit L1′ and L2′ 3 turns in turn, returning to points S2 and S3;

[0081] 7) In row (6), weave the lower surface layer R2 on the back needle bed with a weaving length of H2, so that the weaving point of the back needle bed reaches S4 from S2.

[0082] 8) In row (7), knit a plain stitch on the front and back needle beds as the connecting stitch between the surface layer and the connecting layer, repeat steps 3-6, and finally return to S3 and S4;

[0083] The above steps are a basic cycle.

[0084] The fabric width is fixed;

[0085] R1: surface fabric, R2: inner fabric,

[0086] H1: pre-knitting height, the length of the surface and inner layers of the fabric knitted by the front and rear needle beds;

[0087] H2: the length of knitting on the front needle bed only;

[0088] S1: end point of pre-knitting length of front needle bed;

[0089] S2: end point of the pre-knitting length of the rear needle bed; starting point of the knitting connection layer of the rear needle bed;

[0090] S1 and S2 are woven for the hypotenuse 1 of the triangular connecting layer;

[0091] S3: starting point of the front needle bed knitting connection layer;

[0092] S4: starting point of the back needle bed knitting connection layer;

[0093] S3 and S4 are woven for the hypotenuse 2 of the triangular connecting layer;

[0094] L1: front needle bed knitting connection layer length = L1′: front needle bed knitting length after connection at point Q;

[0095] L2: Length of the back needle bed knitting connection layer = L2′: Length of the back needle bed knitting after connection at point Q;

[0096] (L1=L2=1 / 2 the height of the middle layer)

[0097] Point Q: Connect L1 and L2.

[0098] Type III grid pit structure:

[0099] 1) The front and rear needle beds knit the plain surface layers R1 and R2 respectively to the required height H1, and the front and rear needle beds are located at points S1 and S2;

[0100] 2) At this time, weaving row (1), the front needle bed adjusts the length of the upper surface layer by adjusting the number of rows of R1. The current needle bed knitting height reaches H2 (10 turns, 2.5 cm). At this time, the front needle bed S1 reaches point S4;

[0101] 3) Knitting row (2), the rear needle bed knits the surface layer of R2 to a height of H3 (2 turns, 0.5 cm). At this time, the rear needle bed reaches point S3 from S2;

[0102] 4) At this time, the front and back needle beds knit the plain stitches for the surface layer, the inner layer, and the connecting layer, starting at S3 and S4 respectively; in the third row, knit a set of plain stitches on the front and back needle beds as the connecting stitches for the surface layer and the connecting layer;

[0103] 5) The fourth row of the middle layer structure is connected by knitting L1 and L2 alternately on the front and rear needle beds, with 1 needle selected every other needle, until the length reaches half of the connecting layer, i.e., the front and rear needle beds knit 3 turns;

[0104] 6) In row (5), knit a rib structure at point Q to connect the middle layer knitted on the front and back needle beds;

[0105] 7) In row (6), select needles 1 at a time on the front and rear needle beds and knit L1′ and L2′ alternately for 3 turns, returning to points S3 and S4;

[0106] 8) After completion, the front needle bed knits rows (7)-(8), and the front needle bed moves from point S4 to point S5, so that the fabric height reaches H3 (2 turns, 0.5 cm);

[0107] 9) The back needle bed knits 10 turns, S3 reaches S6, and knits rows (9) to (12). Finally, the starting point of the second bevel of the connecting layer reaches S5 and S6;

[0108] The above is a basic cycle.

[0109] Fabric width fixed

[0110] R1: surface fabric, R2: inner fabric;

[0111] H1: pre-knitting height, the length of the surface and inner layers of the fabric knitted by the front and rear needle beds;

[0112] H2: the length of the front needle bed knitted only (the bottom edge of the trapezoidal structure);

[0113] H3: knitting length of the back needle bed only (the upper bottom edge of the trapezoidal structure);

[0114] S1: end point of pre-knitting length of front needle bed; S2: end point of pre-knitting length of rear needle bed;

[0115] S3: starting point of the back needle bed knitting connection layer; S4: starting point of the front needle bed knitting connection layer (bevel 1 of the trapezoidal connection layer);

[0116] S5: starting point of the front needle bed knitting connection layer; S6: starting point of the back needle bed knitting connection layer (bevel 2 of the trapezoidal connection layer);

[0117] L1: front needle bed knitting connection layer length = L1′: front needle bed knitting length after connection at point Q;

[0118] L2: Length of the back needle bed knitting connection layer = L2′: Length of the back needle bed knitting after connection at point Q;

[0119] (L1=L2=1 / 2 the height of the middle layer)

[0120] Point Q: Connect L1 and L2.

[0121] Example 1:

[0122] Combine Figure 3 As shown in a, the weaving process of the honeycomb concave structure includes the following steps: selecting 13tex×2 cashmere yarn, using the Cixing GE-52C fully computerized flat knitting machine for trial weaving, selecting the fabric with a No. 7 needle, and setting 49 count and 39 turns.

[0123] First, weave 7 turns of double-layer weft plain needle to avoid curling and unraveling;

[0124] In the first row, the front and rear needle beds are respectively lined with hot melt yarn weft plain needle tissue for 7 turns, reaching the height H1. At this time, the front and rear needle beds are at points S1 and S2;

[0125] The second row of fabric has no hot melt on the front and back needle beds, knitting 1+1 rib structure for 3 turns;

[0126] The third row is at the required height A single layer of rib is woven at Q to connect the middle layer of three-dimensional flat knitted spacer fabric;

[0127] In row (4), select needle 1 every other row and knit 3 times, then return to points S1 and S2. This is a basic cycle.

[0128] Row (5) is the starting knitting of the next loop.

[0129] Example 2:

[0130] Combine Figure 3 As shown in (b), the weaving process of the striped groove structure includes the following steps: selecting 13tex×2 cashmere yarn and using the Cixing GE-52C fully computerized flat knitting machine for trial weaving. The fabric is selected with a No. 7 needle and a setting of 50 count and 66 revolutions. The No. 1 and No. 2 yarn mouths drive the cashmere yarn and the hot melt yarn to weave the surface plain weave respectively; the No. 3 and No. 4 yarn mouths drive the cashmere yarn to weave the connecting layer 1-alternate-1 rib weave; the No. 5 and No. 6 yarn mouths drive the cashmere yarn and the hot melt yarn to weave the inner layer plain weave respectively;

[0131] First, the machine head with yarn feeders No. 1 and No. 2 knits, first moving to the right on the front bed to knit, and the machine head with yarn feeders No. 5 and 6 moves to the left on the rear bed to knit, turning back left and right, and knitting 7 turns of double-layer weft plain stitches to avoid curling and unraveling; when knitting the surface and lining layers, the front and rear needle beds are lined with hot melt yarn to knit weft plain stitches for 7 turns to form the surface layers R1 and R2, respectively, and the machine head moves to the right edge of the fabric, turns back and moves left to knit the first row of the back lining layer on the rear bed, and the machine head goes back and forth to the left edge of the fabric to reach the height H;

[0132] In row (1), the machine head with yarn feeders No. 1 and No. 2 only knits the front needle bed. The width of the upper surface layer can be adjusted by adjusting the number of rows of R1. The current needle bed knits 10 turns and the height reaches 2.5 cm. At this time, it reaches points S1 and S2.

[0133] In the second row, a set of plain stitches is knitted on the front and back needle beds as the connecting stitches between the surface layer and the connecting layer;

[0134] In row (3), the machine head with yarn feeders No. 3 and No. 4 knits on the odd-numbered needles between the front and rear needle beds, and alternately knits L1 and L2 every other needle until the length reaches half of the connecting layer, that is, the front and rear needle beds knit 3 turns.

[0135] In row (4), the rib structure is knitted at point Q to connect the middle layer knitted by the front and back needle beds;

[0136] In row (5), select needles 1 at a time on the front and rear needle beds and knit 3 turns of L1′ and L2′ in turn, so that they return to points S1 and S2. The above two rows together complete the one-by-one connecting layer structure, and the machine head with yarn feeders No. 3 and No. 4 moves to the left and out of the knitting area.

[0137] In row (6), the machine head with yarn feeders No. 5 and No. 6 enters the knitting area, knits the lower surface layer R2 on the rear needle bed, knits 10 turns, and adjusts the length to S3;

[0138] In row (7), weave a plain stitch on the front and back needle beds as the connecting stitch between the surface layer and the connecting layer. Repeat rows 2-5, and finally return to S2 and S3. The machine head with yarn feeders No. 4 and No. 5 moves to the left and out of the knitting area. The above steps constitute a basic cycle.

[0139] Example 3:

[0140] Combine Figure 3 As shown in Figure c, the weaving process of the grid pit structure includes the following steps: 13tex×2 cashmere yarn is selected and trial knitted using a Cixing GE-52C fully computerized flat knitting machine. The fabric is selected with a No. 7 needle and a setting of 50 count and 66 revolutions. Yarn mouths No. 1 and No. 2 drive the cashmere yarn and the thermal melt yarn to knit the surface plain weave; yarn mouths No. 3 and No. 4 drive the cashmere yarn to knit the connecting layer 1-alternate-1 rib weave; yarn mouths No. 5 and No. 6 drive the cashmere yarn and the thermal melt yarn to knit the inner layer plain weave respectively.

[0141] First, the machine head with yarn feeders No. 1 and No. 2 knits, first moving to the right on the front bed to knit, and the machine head with yarn feeders No. 5 and 6 moves to the left on the rear bed to knit, turning back left and right, and knitting 7 turns of double-layer weft plain stitches to avoid curling and unraveling; the front and rear needle beds are lined with hot melt yarn to knit weft plain stitches for 7 turns to form surface layers R1 and R2, respectively, and the machine head moves to the right edge of the fabric, turns back and moves left to knit the first row of the back lining layer on the rear bed, and knits to the left edge of the fabric. The machine head goes back and forth to reach the height H; at this time, the front and rear needle beds are located at points S1 and S2;

[0142] In row (1), the machine head with yarn feeders No. 1 and No. 2 enters the knitting area and knits the surface plain weave from left to right. The front needle bed adjusts the width of the upper surface layer by adjusting the number of rows of R1. The current needle bed knitting height reaches H2 (10 turns, 2.5 cm). At this time, the front needle bed reaches S4 from S1.

[0143] In row (2), the machine head with yarn feeders No. 5 and No. 6 moves to the left on the rear bed to weave, and the rear needle bed weaves plain weave R2, so that the surface layer reaches the height H3 (2 turns, 0.5 cm). At this time, the rear needle bed S2 reaches point S3;

[0144] Rows (3) to (6); the machine head with yarn mouths No. 3 and No. 4 enters the knitting process, and the connecting structure of the plain needle surface layer and the connecting layer are knitted on the front and rear needle beds; the connecting layer structure is connected in the same way as the fabric structure in Example 2;

[0145] In rows (7)-(8), the machine head with yarn feeders No. 1 and No. 2 moves to the right on the front needle bed, and the front needle bed moves from point S4 to point S5, so that the fabric height reaches H3 (2 turns, 0.5 cm). The machine head with yarn feeders No. 5 and No. 6 moves to the left on the rear bed, and the rear needle bed knits 10 turns, from S3 to S6.

[0146] In rows (9) to (12), the front and rear needle beds finally reach S5 and S6. The above is a basic cycle.

[0147] The above description is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and changes can be made without departing from the principles of the present invention. These improvements and changes are also considered to be within the scope of protection of the present invention.

Claims

1. A type of light-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure, characterized by: The fabric comprises a plurality of loop structures, each of which comprises a surface layer, an inner layer and a connecting layer connecting the surface layer and the inner layer. The surface layer and the inner layer are both knitted with a plain weft stitch made of yarn mixed with thermal fusible yarns. The connecting layer is knitted with yarns. The knitting method of the connecting layer is to knit a 1+1 rib structure on the front and back needle beds to the required height, knit a single layer of rib to connect the two sections of fabric, and select needles every other time to knit back to the knitting point. This constitutes a basic cycle. The structure of the light-heat conversion spacer fabric imitating the butterfly wing surface light-trapping structure is at least one of a honeycomb concave structure, a stripe groove structure, and a grid pit structure; SolidWorks software was used to perform three-dimensional modeling of the geometric structures of the scales of three typical butterfly species, represented by the blue swallowtail butterfly, the green-banded swallowtail butterfly, and the glass butterfly. After simplification, they were extracted into the aforementioned honeycomb concave structure, striped groove structure, and grid pit structure, respectively.

2. The light-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure according to claim 1 is characterized by: The yarns used in the surface layer, the inner layer and the connecting layer are any one of cotton, polyester, polyester-cotton blended yarn and cashmere yarn.

3. The light-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure according to claim 1 is characterized in that: The thermal melt thread is a nylon thermal melt thread or a polyester thermal melt thread.

4. The light-to-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure according to claim 1, characterized in that: The outer and inner layers are both woven with double-strand 13 tex×2 cashmere yarns mixed with nylon hot-melt yarns in a plain weft stitch structure, and the connecting layer is woven with only cashmere yarns.

5. The light-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure according to claim 1 is characterized in that: The yarn density of the surface and inner layers is 13tex×2, and 150D / 3 hot melt thread is inserted. The yarn density of the connecting layer is 13tex×2.

6. A weaving process for a light-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure according to any one of claims 1 to 5, characterized in that: (1) Weaving according to the specific structure, the specific method is as follows; A. When it is a honeycomb concave structure, the weaving steps are: A1, the first row of knitting, the front and rear needle beds knit the weft plain stitch respectively, reaching the height H1, at this time the front and rear needle beds are at points S1 and S2; A2, the second row of fabric is knitted on the front and rear needle beds. Select needles 1 at a time and knit L1 and L2 alternately on the front and rear needle beds until the length reaches half of the connecting layer. A3, the third row weaves a single layer of rib to connect L1 and L2 at the height of the connecting layer; A4, row 4, select needle 1 every other knit 3 turns L1', L2', return to S1, S2 points, this is a basic cycle; A5, the 5th row is the starting knitting of the next cycle; B. When it is a stripe groove structure, the weaving steps are: B1, knit the plain surface layer R1 and the inner layer R2 on the front and back needle beds respectively, reaching the required height H1. At this time, the front and back needle beds are S1 and S2; B2, knit only the front needle bed, row 1, and reach height H2. At this time, the front needle bed reaches point S3, and the rear needle bed is S2; B3, row 2, knit a set of plain stitches on the front and back needle beds as the connecting stitches between the surface layer and the connecting layer; B4, row 3, select needle 1 on the front and back needle beds and knit L1 and L2 alternately, until the length of the connecting layer reaches half; B5, row 4, knit rib structure at the junction of L1 and L2 to connect the middle layer knitted on the front and back needle beds; B6, row 5, select needle 1 on the front and rear needle beds and knit L1′ and L2′ alternately for 3 turns, so that they return to points S2 and S3; B7, row 6, knit the lower surface layer R2 on the back needle bed, knitting length H2, so that the knitting point on the back needle bed reaches S4 from S2; B8, row 7, knit plain stitches on the front and back needle beds as the connecting stitches between the surface layer and the connecting layer, repeat steps B3-B6, and finally return to S3 and S4; The above steps B1-B8 are a basic cycle; C. When it is a grid pit type structure, the weaving steps are: C1, the front and rear needle beds knit the plain surface layers R1 and R2 respectively, reaching the required height H1. At this time, the front and rear needle beds are located at points S1 and S2; C2, knitting the first row, the front needle bed knitting height reaches H2, at this time the front needle bed S1 reaches point S4; C3, knitting the second row, the rear needle bed knits the surface layer of R2 to the height H3, at this time the rear needle bed reaches S3 from S2; C4, row 3, knit a set of plain stitches on the front and back needle beds as the connecting stitches between the surface layer and the connecting layer; C5, the 4th row of middle layer structure connection, select 1 needle every other needle on the front and back needle beds to knit L1 and L2 alternately, reaching half of the length of the connection layer; C6, row 5: knit rib structure at the junction of L1 and L2 to connect the middle layer knitted on the front and back needle beds; C7, row 6, select needles 1 at a time on the front and rear needle beds and knit L1′ and L2′ alternately for 3 turns, returning to points S3 and S4; C8, the front needle bed knits rows 7-8, and the front needle bed moves from point S4 to point S5, so that the fabric height reaches H3; C9, knit on the back needle bed, so that S3 reaches S6, knit rows 9-12, and finally the starting point of the second bevel of the connecting layer reaches S5 and S6; The above steps C1-C9 are a basic cycle; (2) After weaving, the two layers of surface fabric are lined with hot melt wire in the latitude direction for reinforcement. The ironing effect is very good, and the thickness of the entire connecting layer is uniform and solid: the plain stitch is knitted alternately on the front and back needle beds. Secondly, the hot melt thread is woven into the front and back needle beds. In order to avoid the hot melt thread being too long, a certain interval is selected to do the tuck process on the knitting needle; (3) Finally, weave step (1) and step (2) alternately to reach the required height.

7. The weaving process of the light-heat conversion spacer fabric with a butterfly wing-like surface light-trapping structure according to claim 6 is characterized by: The knitting is done on a Cixing GE-52C fully computerized flat knitting machine with a No. 7 needle. The honeycomb concave structure and the grid pit structure are set at 50 counts and 66 turns, and the stripe groove structure is set at 49 counts and 39 turns.

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