Weft-knitted double-sided knitted fabric with breathability and preparation method therefor

Abstract

A weft-knitted double-sided knitted fabric with breathability and a preparation method therefor. The weft-knitted double-sided knitted fabric comprises a fabric body comprising a front layer and a back layer, wherein the front layer of the fabric body is of a single-sided structure comprising at least one type of yarns Y1, and the back layer of the fabric body is of a single-sided structure comprising at least one type of yarns Y2; a plurality of front loops are formed by weaving on the front layer of the fabric body, and a plurality of back loops are formed by weaving on the back layer of the fabric body; sinker loops of the front loops extend from the front layer to the back layer and then return to the front layer, and sinker loops of the back loops extend from the back layer to the front layer and then return to the back layer; and the sinker loops of the front loops and the sinker loops of the back loops are interlooped with each other, such that the front layer and the back layer are combined and connected, so as to form a double-sided fabric with a pattern cycle structure.

Description

A kind of weft-knitted double-sided knitted fabric with breathability and preparation method thereof Technical Field

[0001] The invention belongs to the technical field of textile fabrics, in particular to a weft-knitted double-sided fabric with air permeability and a preparation method thereof. Background Art

[0002] Comfortable fabrics are attracting more and more attention. They are fluffy, comfortable against the skin, and breathable. By adjusting certain yarn types, they can achieve a certain functional structure. The fabrics woven from this structure will inevitably be sought after by the market.

[0003] Patent CN218026591U, a double-sided jacquard fabric, belongs to the field of knitting technology and provides a high-gauge jacquard fabric. The fabric includes a fabric body, which is knitted on a double-sided 40G high-gauge circular knitting machine, wherein the knitting machine draws out one needle every n needles. The fabric body is knitted horizontally using one or two yarns, and the fabric has straight lines vertically. The surface of the fabric body has a vertical stripe or rectangular pattern. The needle drawing method enables the formation of vertical stripes or rectangular patterns on the double-sided 40G high-gauge circular knitting machine, and avoids the problem of needle damage and syringe damage caused by excessive yarn intake. Although the high-gauge jacquard fabric provided by this patent has a novel style, a thin and impermeable fabric, and is sweat-wicking and quick-drying, making it suitable for sportswear and home leisure wear, the fabric structure is not much different from that of ordinary weft-knitted interlocking rib fabrics, and cannot effectively improve the fluffiness of interlocking rib fabrics. Moreover, it cannot achieve a single moisture-wicking function by replacing different yarns.

[0004] Patent CN102363901A discloses a double-sided fabric, comprising an upper weft yarn, a lower weft yarn, and a connecting weft yarn, wherein the connecting weft yarn is interwoven with the upper weft yarn and the lower weft yarn, wherein the upper weft yarn and the lower weft yarn are elastic long fiber yarns, and the connecting weft yarn is a water-absorbing short fiber yarn. The fabric of this invention has a double-layer, double-sided structure, is water-absorbing and cool, and has a soft hand feel and good texture. Although the fabric of this invention has a double-layer, double-sided structure, since both layers are plain weave, the fabric is not actually very soft and is not very comfortable against the skin. It is more suitable for use as a fabric for a non-conforming layer.

[0005] Based on the analysis of existing technologies, it is still difficult to improve the fluffiness and comfort of double-sided knitted fabrics through fabric structure while also providing them with certain functionality. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a weft-knitted double-sided fabric with air permeability and a preparation method thereof.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A breathable weft-knitted double-sided fabric comprises a fabric body, the fabric body comprising a front layer and a back layer, the front layer of the fabric body being a single-sided structure including at least one yarn Y1, and the back layer of the fabric body being a single-sided structure including at least one yarn Y2, the front layer of the fabric body being woven to form a plurality of front coils, and the back layer of the fabric body being woven to form a plurality of back coils, the sinking arcs of the front coils extending from the front layer to the back layer and then back to the front layer, the sinking arcs of the back coils extending from the back layer to the front layer and then back to the back layer, the sinking arcs of the front coils and the sinking arcs of the back coils being intertwined, so that the front layer and the back layer are combined and connected to form a double-sided fabric with a patterned loop structure; the patterned loop structure comprises a plurality of patterned units, in which the yarn Y1 and the yarn Y2 are looped sequentially in the same weaving system.

[0009] The inlay longitudinal angle β1 of the yarn Y1 is greater than the inlay longitudinal angle β2 of the yarn Y2, and the inlay transverse angle α1 of the yarn Y1 is smaller than the inlay transverse angle α2 of the yarn Y2.

[0010] The number of needles used when knitting the yarn Y1 and the yarn Y2 is 8G-50G, preferably 18G-40G.

[0011] Both Y1 and yarn Y2 are long fibers with a denier of 10D-200D, preferably 20D-150D.

[0012] The yarn Y1 and the yarn Y2 are both short fibers with a count of 8S-200S, preferably 20S-100S.

[0013] The number of fibers of the yarn Y1 is greater than that of the yarn Y2, so that the capillary effect of the front layer is greater than that of the back layer, and moisture is conducted unidirectionally from the front layer to the back layer.

[0014] The fabric body is further added with hot-melt elastic polyurethane fibers.

[0015] A method for preparing a breathable weft-knitted double-sided fabric, characterized in that it comprises the following steps:

[0016] Knitting is done using a weft knitting double-sided machine;

[0017] A fabric body is knitted using at least two yarns including yarn Y1 and yarn Y2, the fabric body comprising a front layer and a back layer, the front layer being a single-face structure including at least yarn Y1, and the back layer being a single-face structure including yarn Y2;

[0018] The yarn Y1 is knitted from the front layer of the fabric body to form a front loop. When the yarn Y1 is routed, the yarn Y1 is led from the front layer to the back layer and then back to the front layer to form a loop. The yarn Y2 is woven from the back layer of the fabric body to form a back loop. When the yarn Y2 is routed, the yarn Y2 is led from the back layer to the front layer and then back to the back layer to form a loop. In this process, the sinking arcs of the front loop and the back loop are intertwined, so that the front layer and the back layer are connected to each other, forming a double-sided fabric with a patterned loop structure.

[0019] The pattern circulation structure includes several pattern units. In one pattern unit, at least one route is formed by adjusting the longitudinal angle and transverse angle of the yarn inlay of yarn Y1 and yarn Y2, so that yarn Y1 and yarn Y2 are fed into the same weaving system one after another and woven into loops in sequence.

[0020] The yarn Y1 bends ahead of the yarn Y2, so that the yarn Y1 falls on the needle bar of the upper knitting needle for bending, and at the same time the yarn Y2 is fed into the needle hook of the upper needle. When the yarn Y2 is bent and looped, the yarn Y1 is unlooped together with the old loop remaining on the needle bar of the upper needle, so that the yarn Y1 and the yarn Y2 are entangled together to form a mutual string connection.

[0021] When the front and back layers of the fabric body are coiled, specifically:

[0022] The lower needle of the weft knitting double-sided machine is ahead of the upper needle to start and withdraw the needle;

[0023] The lower needle pads the yarn. When the upper needle reaches the highest point, the lower needle begins to insert the yarn Y1, and then bends the yarn and forms a loop. The lower needle first descends, and the yarn Y1 is padded into the needle hook and closed. At this time, the yarn will be padded into the needle bar of the upper needle.

[0024] The lower needle bends the yarn, hooks the yarn Y1, and places it on the upper needle bar to bend the yarn to form an extended loop, and then the upper needle inserts the yarn Y2;

[0025] The upper needle hooks the yarn Y2 and moves toward the needle cylinder;

[0026] The upper needle bends the yarn and moves toward the needle cylinder to bend the yarn Y2 and remove the old loop and yarn Y1 on the original needle bar;

[0027] Knitting: After the upper needle and the lower needle bend the yarn into a loop, both the upper needle and the lower needle form the required loop length.

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

[0029] By using the sinking arcs on the coils of the front layer and the back layer to string together, the front layer and the back layer are firmly connected to form a double-sided patterned circular fabric. The resulting fabric also has fluffy and soft properties. In order to increase air permeability, mesh holes can be set in the front layer and / or the back layer. By selecting yarns with different capillary effects, the moisture conductivity of the front layer and the back layer is made different, especially the moisture conductivity of the front layer is made greater than that of the back layer, so that water is transferred unidirectionally from the front layer to the back layer, and the purpose of the liquid water unidirectional transfer index OWTC ≥ 100% can be achieved. In addition, by adding hot-melt elastic polyurethane fibers, the fabric can be cut in any direction without affecting the integrity of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a schematic diagram of the connection structure of the front coil and the back coil of the present invention;

[0031] FIG2 is a schematic diagram of a woven inlay yarn structure according to the present invention;

[0032] FIG3 is a second schematic diagram of a woven inlay yarn structure according to the present invention;

[0033] FIG4 is a schematic diagram of the yarn inlay angle of the present invention;

[0034] FIG5 is a schematic diagram of the yarn laying arrangement of the present invention;

[0035] Figure 6 is a schematic diagram of the lower needle bending yarn of the present invention;

[0036] FIG7 is a schematic diagram of the upper needle bending yarn of the present invention. Modes for Carrying Out the Invention

[0037] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like are used to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0040] Example 1

[0041] As shown in Figures 1-3, a breathable weft-knitted double-sided fabric includes a fabric body, the fabric body includes a front layer and a back layer, the front layer of the fabric body is a single-sided structure including at least one yarn Y1, and the back layer of the fabric body is a single-sided structure including at least one yarn Y2. The front layer of the fabric body is woven to form a plurality of front loops, and the back layer of the fabric body is woven to form a plurality of back loops. The sinking arc of the front loop extends from the front layer to the back layer and then back to the front layer. The sinking arc of the back loop Extending from the back layer to the front layer and then back to the back layer, the sinking arc of the front coil and the sinking arc of the back coil are intertwined with each other through the mutually extended and returned routing, so that the front layer and the back layer are combined and connected to form a double-sided fabric with a pattern loop structure; the pattern loop structure includes a plurality of pattern units, and in a pattern unit, there is at least one route in which yarn Y1 and yarn Y2 are fed into the same weaving system in succession by adjusting their longitudinal yarn angle β and transverse yarn angle α, and are woven into loops in sequence.

[0042] The longitudinal inlay angle β1 of yarn Y1 is greater than the longitudinal inlay angle β2 of yarn Y2, and the transverse inlay angle α1 of yarn Y1 is less than the transverse inlay angle α2 of yarn Y2. For the definitions of the longitudinal and transverse inlay angles, refer to Figure 4 : the longitudinal inlay angle β is the angle between the projection 3 of the yarn 1 drawn out from the yarn guide on the needle plane and the jaw line 2 of the sinker; the longitudinal inlay angle α is the angle between the projection 4 of the yarn 1 drawn out from the yarn guide on the horizontal plane and the jaw line 2.

[0043] Furthermore, the yarns Y1 and Y2 are knitted using a needle count of 8G-50G, preferably 18G-40G. Both yarns Y1 and Y2 are long-staple yarns with a denier of 10D-200D, preferably 20D-150D. Both yarns Y1 and Y2 are short-staple yarns with a count of 8S-200S, preferably 20S-100S. This selection of yarns allows for a softer feel.

[0044] The number of fibers of the yarn Y1 is greater than that of the yarn Y2, so that the capillary effect of the front layer is greater than the capillary effect of the back layer, so that moisture is conducted unidirectionally from the front layer to the back layer. By selecting yarns with different performances, the liquid water unidirectional transmission index OWTC of the fabric body can be made ≥100%, thereby ensuring that the skin-contacting layer remains dry.

[0045] The fabric body is also added with hot-melt elastic polyurethane fiber, which makes the fabric as a whole have good elasticity. No matter which angle it is cut from, there will be no hindrance, and the fabric will not completely fall apart after cutting. The front layer and the back layer coils are intertwined to ensure the stability of the connection, and at the same time support each other to keep the fabric fluffiness good.

[0046] The front layer and / or back layer of the fabric body has mesh holes to improve air permeability.

[0047] Example 2

[0048] The present application also discloses a method for preparing a breathable weft-knitted double-sided fabric, comprising the following steps:

[0049] Knitting is done using a weft knitting double-sided machine;

[0050] A fabric body is knitted using at least two yarns including yarn Y1 and yarn Y2, the fabric body comprising a front layer and a back layer, the front layer being a single-face structure including at least yarn Y1, and the back layer being a single-face structure including yarn Y2;

[0051] The yarn Y1 is knitted from the front layer of the fabric body to form a front loop. When the yarn Y1 is routed, the yarn Y1 is led from the front layer to the back layer and then back to the front layer to form a loop. The yarn Y2 is woven from the back layer of the fabric body to form a back loop. When the yarn Y2 is routed, the yarn Y2 is led from the back layer to the front layer and then back to the back layer to form a loop. In this process, the sinking arcs of the front loop and the back loop are intertwined, so that the front layer and the back layer are connected to each other, forming a double-sided fabric with a patterned loop structure.

[0052] The pattern circulation structure includes several pattern units. In one pattern unit, at least one route is formed by adjusting the longitudinal angle and transverse angle of the yarn inlay of yarn Y1 and yarn Y2, so that yarn Y1 and yarn Y2 are fed into the same weaving system one after another and woven into loops in sequence.

[0053] For specific knitting, as shown in Figure 5, yarn Y1 bends ahead of yarn Y2, so that yarn Y1 falls on the needle bar of the upper knitting needle for bending. At the same time, yarn Y2 is fed into the needle hook of the upper needle. When yarn Y2 bends and forms a loop, yarn Y1 and the old loop on the upper needle bar are unhooked together, so that yarn Y1 and yarn Y2 are entangled together, that is, yarn Y1 forms a "needle-containing" on side B. This "needle-containing" formation can be formed only through the process of upper needle unhooking, without going through the process of upper needle unhooking-yarn padding-yarn bending-looping, saving knitting technology and improving weaving efficiency.

[0054] The loop forming process for the front and back layers is as follows:

[0055] A. Withdraw: The lower needle is ahead of the upper needle to withdraw the needle.

[0056] B. Yarn Pad on the Lower Needle: As the upper needle reaches its highest point, the lower needle begins to insert yarn Y1, followed by yarn bending and looping. As shown in Figure 5, the lower needle descends first, yarn Y1 is inserted into the hook and closed, and the yarn is about to be inserted into the upper needle bar.

[0057] C. Bend the yarn with the lower needle: The lower needle hooks the yarn Y1 and places it on the upper needle bar to bend the yarn to form an extended loop, and then the upper needle cushions the yarn Y2 as shown in Figure 6.

[0058] D. Upper needle yarn pad: The upper needle hooks the yarn Y2 and moves toward the needle cylinder.

[0059] E. Upper needle bends yarn: The upper needle moves toward the needle cylinder, bends yarn Y2, and removes the old coil 2 and yarn Y1 on the original needle bar, as shown in Figure 7.

[0060] F. Looping: After the upper and lower needles bend the yarn into a loop, both the upper and lower needles form the required loop length.

[0061] Production Example

[0062] The design required an underwear fabric with a woven front material of nylon and a woven back material of nylon. The fabric should be fluffy, soft, comfortable, and have moisture absorption and quick-drying properties. Under the AATCC 195 test method, the differential moisture transport capacity (OWTC) of the liquid water fabric on both sides of the fabric should be ≥100%. Under the LTD03 7.5lbf tensile test method, the warp openness should be greater than 100%, and the weft openness should be greater than 180%.

[0063] 1. Yarn selection:

[0064] Y1 uses Cotton 100S / 1 compact Z-twist filament yarn, Y2 elastic yarn uses PA6 30D / 36F / 1 SD DTY, and Y3 elastic polyurethane yarn uses Lycra 30D.

[0065] 2. Model used:

[0066] Weft knitting double-sided machine, 32G, 34 inches.

[0067] 3. Weaving process:

[0068] Through the weaving method disclosed in this patent, yarn Y1 and yarn Y2 are woven simultaneously in a loop-forming system. Yarn Y1 is fed to the lower needle, and yarn Y2 is fed to the upper needle. The lower needle yarn Y1 is bent into a loop before yarn Y2. During the bending process, the yarn falls on the upper needle bar, and then the upper needle with yarn Y2 is bent and yarn Y1 is unhooked from the old loop on the upper needle bar. Two elastic polyurethane yarns Y3 are fed simultaneously with yarn Y1 and yarn Y2 to form a plating structure, thereby forming the fabric of this application.

[0069] Yarn Denier / Count Fiber Count Gloss Yarn Type Thread Length (CM / 100G) Yarn Ratio % Y1 Cotton 100S1 Compact Spinning 3620 48.3% Y2 PA 630D 36FS DD TY 3622 30% Y3 PU 30D SD 728 21.8%

[0070] 4. Referring to Figures 2 and 3, there are schematic diagrams of specific weaving inlay yarns, which can form a diamond-shaped pattern on the fabric.

[0071] 5. Pin arrangement

[0072] 2 1 2 1

[0073] 1 2 1 2.

[0074] 6. Actual finished product data

[0075] Width: 145cm Weight: 185g Horizontal WPC density: 22 pieces / cm Vertical WPC density: 28 pieces / cm

[0076] 7. Test Data

[0077] a) Moisture absorption and quick drying are tested according to JS L1907 standard:

[0078]

[0079] b) Differential One-Way Transport Capability (OWTC) of the fabric: Tested according to AATCC 195, "Liquid Moisture Management Properties of Textile Fabrics," the fabric's OWTC was 113%.

[0080] c)FTT fabric feel tester test

[0081] The thickness T=0.67mm under standard pressure (0.41N / cm2).

[0082] d) Elongation and Recovery Based on the LTD03 7.5lbf tensile test method:

[0083] Direction Elongation Recovery Warp 109% 94% Weft 194% 91%

[0084] According to the comprehensive test results, the weft-knitted double-sided fabric obtained in the present application has a fluffy and soft hand feel, has good moisture absorption and quick-drying functions, and very good moisture conductivity, and has good openness and recovery, which makes the weft-knitted fabric of the present invention have a very good wearing feel.

[0085] It should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A weft-knitted double-sided fabric with air permeability, comprising a fabric body, characterized in that: The fabric body includes a front layer and a back layer, the front layer of the fabric body is a single-sided structure including at least one yarn Y1, and the back layer of the fabric body is a single-sided structure including at least one yarn Y2. The front layer of the fabric body is woven to form a plurality of front coils, and the back layer of the fabric body is woven to form a plurality of back coils. The sinking arc of the front coil extends from the front layer to the back layer and then returns to the front layer, and the sinking arc of the back coil extends from the back layer to the front layer and then returns to the back layer. The sinking arc of the front coil and the sinking arc of the back coil are mutually intertwined, so that the front layer and the back layer are combined and connected to form a double-sided fabric with a pattern circulation structure; the pattern circulation structure includes a plurality of pattern units, and in a pattern unit, the yarn Y1 and the yarn Y2 are sequentially looped in the same weaving system.

2. The breathable weft-knitted double-sided fabric according to claim 1, characterized in that: The inlay longitudinal angle β1 of the yarn Y1 is greater than the inlay longitudinal angle β2 of the yarn Y2, and the inlay transverse angle α1 of the yarn Y1 is smaller than the inlay transverse angle α2 of the yarn Y2.

3. The breathable weft-knitted double-sided fabric according to claim 1, characterized in that: The number of needles used when knitting the yarn Y1 and the yarn Y2 is 8G-50G, preferably 18G-40G.

4. The breathable weft-knitted double-sided fabric according to claim 1, characterized in that: The yarn Y1 and the yarn Y2 are both long fibers with a denier of 10D-200D, preferably 20D-150D.

5. The breathable weft-knitted double-sided fabric according to claim 1, characterized in that: The yarn Y1 and the yarn Y2 are both short fibers with a count of 8S-200S, preferably 20S-100S.

6. The breathable weft-knitted double-sided fabric according to claim 1, characterized in that The number of fibers of the yarn Y1 is greater than that of the yarn Y2, so that the capillary effect of the front layer is greater than the capillary effect of the back layer, so that moisture is unidirectionally conducted from the front layer to the back layer.

7. The breathable weft-knitted double-sided fabric according to claim 1, characterized in that: The fabric body is also added with hot-melt elastic polyurethane fibers.

8. A method for preparing a breathable weft-knitted double-sided fabric according to any one of claims 1 to 7, characterized in that: The following steps are involved: Knitting is done using a weft knitting double-sided machine; A fabric body is obtained by weaving at least two kinds of yarns including yarn Y1 and yarn Y2, wherein the fabric body has a front layer and a back layer, wherein the front layer is a single-face structure including at least yarn Y1, and the back layer is a single-face structure including yarn Y2; The yarn Y1 is knitted from the front layer of the fabric body to form a front coil. When the yarn Y1 is routed, the yarn Y1 is led from the front layer to the back layer and then returned to the front layer to form a coil; the yarn Y2 is woven from the back layer of the fabric body to form a back coil. When the yarn Y2 is routed, the yarn Y2 is led from the back layer to the front layer and then returned to the back layer to form a coil. In this process, the sinking arcs of the front coil and the back coil are mutually intertwined, so that the front layer and the back layer are connected to each other, forming a double-sided fabric with a patterned loop structure; The pattern circulation structure includes a plurality of pattern units. In one pattern unit, at least one route is formed by adjusting the longitudinal angle and the transverse angle of the inlay yarn of yarn Y1 and yarn Y2, so that yarn Y1 and yarn Y2 are fed into the same weaving system successively and woven into loops in sequence.

9. The method for preparing a breathable weft-knitted double-sided fabric according to claim 8, characterized in that: The yarn Y1 bends ahead of the yarn Y2, so that the yarn Y1 falls on the needle bar of the upper knitting needle for bending, and at the same time the yarn Y2 is fed into the needle hook of the upper needle. When the yarn Y2 is bent and looped, the yarn Y1 is unlooped together with the old loop remaining on the needle bar of the upper needle, so that the yarn Y1 and the yarn Y2 are entangled together to form a mutual string connection.

10. The method for preparing a breathable weft-knitted double-sided fabric according to claim 8, characterized in that: When the front and back layers of the fabric body are looped, specifically: The lower needle of the weft knitting double-sided machine is ahead of the upper needle to start the needle and withdraw the loop; The lower needle pads the yarn. When the upper needle starts to needle to the highest point, the lower needle begins to weigh the yarn Y1, and then bends the yarn and forms a loop. The lower needle first descends, and the yarn Y1 is padded into the needle hook and closed. At this time, the yarn will be padded into the needle bar of the upper needle. The lower needle bends the yarn, hooks the yarn Y1, and places it on the upper needle bar to bend the yarn, forming an extended loop, and then the upper needle inserts the yarn Y2; The upper needle places the yarn, hooks the yarn Y2, and moves toward the needle cylinder; The upper needle bends the yarn, and the upper needle moves toward the needle cylinder to bend the yarn Y2, and remove the old coil and yarn Y1 on the original needle bar; Knitting: After the upper and lower needles bend the yarn into a loop, both the upper and lower needles form the required loop length.

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