Variable thickness tricot interlining spacer fabric and method of knitting the same

Abstract

The application relates to a variable-thickness weft-knitted spacer fabric and a weaving method thereof, and relates to the field of knitted fabrics. The variable-thickness weft-knitted spacer fabric is formed by using a double-layer variable plain circular stitch of a face yarn A as a face stitch to form an upper surface layer and a lower surface layer of the variable-thickness weft-knitted spacer fabric; a weft yarn B is inserted into the face stitch through a guide; and a spacer yarn C is knitted into a double-face tuck in a V-shaped mode to intertwine the upper surface layer and the lower surface layer to form the spacer fabric. In this case, the double-layer variable plain circular stitch as the face stitch makes the surface layers of the fabric more thick and firm, and can fix the spacer yarn, so that the structural stability, thickness and compression performance of the existing weft-knitted spacer fabric can be improved; and when the stitch indexes of the knitting needles are different, the thickness of the fabric surface can be changed to form a concave-convex structure, and the visual effect of the fabric can be improved.

Description

Technical Field

[0001] This application relates to the field of knitted fabric technology, and in particular to a variable thickness horizontally knitted weft-inserted spacer fabric and its knitting method. Background Technology

[0002] Due to the limited spacing between the front and rear needle beds of the flat knitting machine, traditional horizontal knitting spacer fabrics are relatively thin. Moreover, most existing horizontal knitting spacer fabrics are made of conventional polyester, nylon and other chemical fiber filaments, which have average compression resistance and resilience, and the surface structure patterns are simple, mostly ordinary weft plain knitting. This results in fewer product types and a limited range of applications for horizontal knitting spacer fabrics.

[0003] In related technologies, patent CN105926144A discloses a knitting method for a flat knitting machine with interlocking weft yarns. Specifically, it includes inserting bulky yarns into an air layer, and then connecting the front and rear needle beds with elastic yarns in a looping manner to fix the bulky yarns vertically and prevent vertical movement. However, this technical solution uses all needles to knit the loops together without a method to fix them, making the loops prone to protruding from the fabric surface, affecting the fabric's visual appearance and feel. Furthermore, when starting stitches in a fabric structure, the loops easily detach from the needle hooks, forming floating threads, affecting knitting, and reducing the fabric's structural stability, thus impacting the fabric's compression performance and visual appearance. Summary of the Invention

[0004] The purpose of this application is to provide a variable thickness horizontally woven weft-inserted interlocking fabric and its weaving method to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, this application provides a variable thickness horizontal knitted weft-inserted spacer fabric, wherein the variable thickness horizontal knitted weft-inserted spacer fabric uses a double-layer variable plain knit cylindrical structure woven from face yarn A as the face structure to form the upper and lower face layers of the variable thickness horizontal knitted weft-inserted spacer fabric; the weft yarn B is inserted into the face structure through a yarn guide; the spacer yarn C is woven in a "V" shape with double-sided loops to interlock the upper and lower face layers to form the spacer fabric; The double-layer variable plain knit cylindrical structure is a composite structure woven with alternating plain knit and full plain knit according to a specific loop index ratio; due to the different loop indices on different needles on the same horizontal row, the upper and lower horizontal rows form concave-convex structures of different thicknesses. The spacer wire C is woven into a double-sided loop in a "V" shape, including: woven into loops with alternating needles on the front and back needle beds, and the spacer wire C is arranged in a "V" shape; When the yarn A is looped on the odd-numbered needles of the front and rear needle beds, the spacer yarn C is looped on the even-numbered needles of the front and rear needle beds; when the yarn A is looped on the even-numbered needles of the front and rear needle beds, the spacer yarn C is looped on the odd-numbered needles of the front and rear needle beds. The floating thread formed when the yarn A is looped on odd or even needles is pressed onto the loop woven on the corresponding needle to fix the spacer thread C.

[0006] In one possible implementation, the yarn A is T400, the yarn A has a fineness of 300D, and is woven from two strands.

[0007] In one possible implementation, the weft yarn B is an ultra-high molecular weight polyethylene multifilament, and the fineness of the weft yarn B is 300D.

[0008] In one possible implementation, the spacer wire C is a polyester monofilament with a diameter of 0.25 mm.

[0009] Secondly, this application provides a method for weaving a variable thickness horizontally knitted weft-inserted spacer fabric. The method is applicable to the variable thickness horizontally knitted weft-inserted spacer fabric described above. The method employs a multi-system, multi-needle bed computerized flat knitting machine with sinkers for weaving. The method includes: S1. Yarn A is knitted with full stitches for 1 row on each of the front and back needle beds, or with skipped stitches for n rows to form the upper and lower surface layers, where n is the stitch count and n>0; S2. Insert the weft yarn B into the fabric structure; S3. Spacer yarn C is woven in a "V" shape on the odd-numbered needles of the front and rear needle beds to connect the upper surface layer to the lower surface layer. S4. The yarn A is knitted in circles on the even number of needles of the front and rear needle beds; S5. Repeat steps S1 to S4 multiple times to obtain a variable thickness horizontally woven weft-inserted spacer fabric, the difference being that: the spacer yarn C is woven in a "V" shape on the even-numbered needles of the front and rear needle beds to connect the upper surface layer with the lower surface layer, and the face yarn A is looped on the odd-numbered needles of the front and rear needle beds.

[0010] In one possible implementation, the fineness of the weft yarn B is less than 2 / 3 of the spacing between the front and rear needle beds, and does not affect the weaving of the spacer yarn C.

[0011] In one possible implementation, the number of needles traversed by the spacer wire C is m, where m ≤ 10 needles.

[0012] In one possible implementation, during the knitting process: the needles of the front and rear needle beds are configured to match the needles.

[0013] The beneficial effects of the technical solution provided in this application include at least the following: 1. The variable thickness horizontal knitted weft-inserted spacer fabric provided in this application inserts high-performance weft yarn B between the spacer yarns C, filling the gaps between the upper and lower horizontal spacer yarns C, reducing the mechanical weak links of the fabric, and improving the overall compressibility of the fabric. 2. The surface of the variable thickness horizontally woven weft-inserted interlayer fabric provided in this application has a concave-convex structure with varying thickness, which improves the visual effect of the fabric. 3. The weaving method of the variable thickness horizontally knitted weft-inserted interlocking fabric provided in this application uses a double-layer variable plain knit cylindrical structure woven from yarn A as the face structure, which is a combination of full-needle and spaced-needle plain knit structures. When odd-numbered needles form loops, the floats formed by even-numbered needles can be pressed onto the tucked loops woven by even-numbered needles to play a fixing role; similarly, when even-numbered needles form loops, the floats formed by odd-numbered needles can be pressed onto the tucked loops woven by odd-numbered needles to play a fixing role. The tucked loops are not easy to protrude from the fabric surface. At the same time, when the face knit group starts knitting, the tucked loops are not easy to fall off the needle hooks to form floats, thereby affecting the knitting effect, thus improving the structural stability and compression performance of the fabric. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the embodiments of the present application to explain the application and do not constitute a limitation thereof. In the drawings: Figure 1 This illustration shows a structural schematic diagram of a weft section of a variable-thickness cross-knitted weft-interval fabric provided in an exemplary embodiment of this application; Figure 2 The diagram shows the process of weaving a variable thickness horizontally woven weft-inserted spacer fabric according to a specific embodiment of this application. Figure 3 This diagram illustrates the principle of fixing the spacer yarn C in the weaving method of the variable thickness horizontally woven weft-inserted spacer fabric provided in a specific embodiment of this application. Figure 4 A process weaving diagram of the weaving method of the variable thickness horizontally woven weft-inserted spacer fabric provided in the second specific embodiment of this application is shown; Figure 5 The diagram shows the compression strain-stress curve of the variable thickness weft-insulated interlocking fabric provided in a specific embodiment of this application. Figure 6 The force-displacement curve of the variable thickness weft-insulated interlocking fabric provided in a specific embodiment of this application is shown. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "multiple" means two or more.

[0017] First, a brief introduction to the terms used in the embodiments of this application: The loop index (a) indicates the number of times a loop remains continuous during knitting. A higher loop index generally indicates a larger loop. The greater the difference in loop index between different knitting needles, the better the yarn elasticity, the higher the fabric density, the more pronounced the thickness variation, and the more noticeable the unevenness effect. This knitting method can be used to improve the visual appeal and breathability of fabrics.

[0018] Row splitting: This method involves breaking down some or all of the loops according to a certain pattern and knitting or turning the stitches on different rows. This knitting method is often used in cable knit structures to reduce knitting tension. Breaking down plain knit structures into multiple rows results in a thicker fabric.

[0019] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1This illustration shows a schematic diagram of a variable-thickness horizontally knitted weft-inserted spacer fabric provided in an exemplary embodiment of this application. The variable-thickness horizontally knitted weft-inserted spacer fabric uses a double-layer variable plain knit cylindrical structure woven from face yarn A100 as the face structure to form the upper and lower face layers. The weft yarn B200 is inserted into the face structure through a yarn guide. The spacer yarn C300 is woven in a "V" shape with double-sided loops, interlocking the upper and lower face layers to form the spacer fabric. This double-layer variable plain knit cylindrical structure is a composite structure woven from spaced-needle plain knit and full-needle plain knit according to a specific loop index ratio. Due to the different loop indices on different needles in the same horizontal row, the same horizontal row of the upper and lower face layers forms a concave-convex structure of different thicknesses. Needles with non-loose loops form thinner raised portions, while ordinary knitted loop portions are thicker. The thicker raised portion 400 and the thinner portion 500 are arranged with odd and even number needles interlaced.

[0021] Specifically, the spacer yarn C300 is woven into double-sided loops in a "V" shape, including: woven into loops with alternating needles on the front and back needle beds, and the spacer yarn C300 is arranged in a "V" shape.

[0022] Specifically, the yarn A100 is T400, with a fineness of 300D, woven from two strands. T400 composite fiber is a new type of elastic composite fiber that does not contain spandex but has good elasticity. It solves many problems associated with spandex, such as difficulty in dyeing, excessive elasticity, complex weaving, unstable fabric dimensions, and spandex aging during use.

[0023] Specifically, the weft yarn B200 is ultra-high molecular weight polyethylene multifilament, and the fineness of the weft yarn B is 300D.

[0024] Specifically, the spacer yarn C300 is a polyester monofilament with a diameter of 0.25 mm.

[0025] Next, a knitting method for a variable thickness horizontal knitted weft-inserted spacer fabric provided in this application will be described. This method is applicable to the variable thickness horizontal knitted weft-inserted spacer fabric as described above. The method uses a computerized flat knitting machine with a gauge of E=14, a multi-system multi-needle bed, and sinkers. This computerized flat knitting machine includes at least a front needle bed, a rear needle bed, an S1 system, and an S2 system, and uses three yarn guides to operate in different knitting systems. The method includes: Step S1: Knit one full row or n rows with skipped stitches on both the front and back needle beds to form the upper and lower surface layers, where n is the stitch count and n>0. Step S2: Insert the weft yarn B into the fabric structure; Step S3: Spacer yarn C is woven in a "V" shape on the odd-numbered needles of the front and back needle beds to connect the upper and lower layers. Step S4: Knit the yarn A in circles on the even-numbered needles of the front and back needle beds; Step S5: Repeat steps S1 to S4 multiple times to obtain a variable thickness horizontally woven weft-inserted spacer fabric. The difference is that the spacer yarn C is woven in a "V" shape on the even-numbered needles of the front and rear needle beds to connect the upper and lower surface layers, and the face yarn A is woven in loops on the odd-numbered needles of the front and rear needle beds.

[0026] It is worth mentioning that the fineness of the weft yarn B is less than 2 / 3 of the spacing between the front and rear needle beds, and it does not affect the weaving of the spacer yarn C; the number of needles that the spacer yarn C crosses is m, where m ≤ 10. In addition, during the weaving process: the needles of the front and rear needle beds are configured to match the needles.

[0027] To better understand this application, the following description, in conjunction with the accompanying drawings and two specific embodiments, provides a further explanation. It should be noted that the embodiments described herein are merely some examples of this application and do not limit the scope of protection of this application. Specific Implementation Example 1: Figure 2 This illustration shows a process diagram of the weaving method for a variable thickness horizontally woven weft-inserted spacer fabric provided in a specific embodiment of this application. In this example, the face yarn A is T400, the weft yarn B is ultra-high molecular weight polyethylene multifilament, and the spacer yarn C is polyester monofilament. The method specifically includes: The face yarn A is knitted in full stitches on the front needle bed for the first row, and in full stitches on the back needle bed for the second row. In the third row, the weft yarn B is inserted. The spacer yarn C is placed on the odd-numbered needles in rows 4 to 7 with a space of 1 (a is 3). The face yarn is knitted in a V-shape on the front and back needle beds. After the knitting is completed, the odd-numbered needles on both the front and back needle beds will have tufted loops. Yarn A is knitted in rounds on the even-numbered needles of the front needle bed for the 8th row, and then in rounds on the even-numbered needles of the back needle bed for the 9th row. At this point, the floats formed by the odd-numbered needles are pressed onto the rounds formed by the odd-numbered needles in rows 4 to 7, serving a securing function (see [link]). Figure 3 This diagram illustrates the fixing principle of the spacer yarn C in the weaving method of the variable thickness horizontally woven weft-inserted spacer fabric provided in a specific embodiment of this application. Simultaneously, in rows 8 and 9, the loop ratio of odd-numbered needles to even-numbered needles is 1:0. Figure 1 As shown in the dashed circle, the odd-numbered needles form elongated loops, which tighten the even-numbered needle loops, causing them to protrude from the fabric surface and create a thickness difference with the fabric surface. Repeat the knitting action of rows 1 to 3 in rows 10 to 12. The spacer yarn C is knitted in a V-shape on the even-numbered needles of rows 13 to 16 with a spacing of 3 stitches between the front and back needle beds. After the knitting is completed, there are tufts on the even-numbered needles of both needle beds. Yarn A is knitted in rounds on the odd-numbered needles of the front needle bed for the 17th row and on the odd-numbered needles of the back needle bed for the 18th row. The float yarn of the even-numbered needles is pressed on the even-numbered needle loops of rows 13 to 16 to fix them. At the same time, in rows 17 to 18, the loop ratio of odd-numbered needles to even-numbered needles is 0:1. The even-numbered needles form elongated loops. These elongated loops tighten the weft plain knit loops of the odd-numbered needles, making them thicker than the elongated loops and protruding from the fabric surface. Therefore, a regular alternating staggered structure of odd and even-numbered needle loops with varying thickness is formed on the upper and lower layers of the fabric. Specific Implementation Example 2: Figure 4 This illustration shows a process weaving diagram of the weaving method for a variable thickness horizontally woven weft-inserted spacer fabric provided in a specific embodiment of this application. In this example, the face yarn A is made of T400, the weft yarn B is made of ultra-high molecular weight polyethylene multifilament, and the spacer yarn C is made of polyester monofilament. Specifically, it includes: The front and back needle beds of veil A are split and knitted in rows n (where n=2). Specifically, the first row is knitted in circles on the odd-numbered needles of the front needle bed, and the second row is knitted in circles on the even-numbered needles of the back needle bed. The third row is knitted in circles on the even-numbered needles of the front needle bed, and the fourth row is knitted in circles on the odd-numbered needles of the back needle bed. The two full rows of the front and back needle beds are split into four rows of knitting. Under the same knitting parameters, the fabric structure of this specific embodiment is thicker and denser than that of Specific Embodiment 1. In row 5, insert the weft yarn B. The spacer yarn C is then knitted in the same manner as in Example 1 above on the odd-numbered needles of rows 6 to 9 as a double-sided loop. The face yarn A is knitted in loops on the even-numbered needles of the front needle bed for rows 10 and 12, and on the even-numbered needles of the back needle bed for rows 11 and 13. At this time, the floating yarn formed by the odd-numbered needles presses onto the loops of the odd-numbered needles in rows 6 to 9, serving a fixing function. Simultaneously, the loop ratio of the odd-numbered needles to the even-numbered needles in rows 10 to 13 is 2:0. Figure 3 As shown in the section circled in dashed lines, the unevenness effect of the thickness variation is more obvious; Repeat the knitting action of rows 1 to 5 in rows 14 to 18. Use spacer C to knit double-sided loops in the same way as before on even-numbered stitches in rows 19 to 22, skipping three stitches. Yarn A is woven into rounds 23 and 24 on the odd-numbered needles of the front needle bed, and into rounds 25 and 26 on the odd-numbered needles of the back needle bed. The floats formed on the even-numbered needles are pressed onto the even-numbered needle loops in rows 16 to 19 to fix them in place. At the same time, in rows 23 to 26, the loop ratio of odd-numbered needles to even-numbered needles on the front and back needle beds is 0:2, resulting in a greater difference in thickness and a more obvious uneven structure on the surface of the fabric.

[0030] Performance testing: The following section presents performance tests on a specific variable-thickness weft-inserted interlocking fabric woven using Example 1, including compression performance and tensile breaking mechanics tests. The compression performance test was conducted according to national standard GB / T24442.2-2009, using a MARK-10 tensile testing machine with a 5cm diameter pressure plate and a fabric sample area of ​​7*7cm. 2 The fabric was compressed to 70% thickness, then the pressure plate returned to its initial position. The compression speed was 12 mm / min. Based on the test results, a compression strain-stress curve was plotted, and the compression work and recovery work were calculated (see [reference]). Figure 5 According to GB / T 3923.2-2013, a tensile fracture test was performed using a MARK-10 tensile tester with a clamp distance of 10 cm. A force-displacement curve was plotted based on the test results, and the maximum force at which the fabric broke was recorded (see [link to relevant documentation]). Figure 6 ).

[0031] Compression work Wc refers to the work done on the sample during the downward uniform compression process by the pressure plate. It represents the ease with which the fabric is compressed. The greater the compression work, the less easily it is compressed. The calculation formula is: ; The recovery work Wr refers to the energy released when a sample recovers to its original state after compression. It represents the resilience of the fabric. The greater the recovery work, the better the resilience. The calculation formula is: ; Where hm represents the thickness loss produced when the fabric is compressed to the maximum pressure, P1 is the force-displacement curve of the fabric at its maximum, and P2 is the compression-recovery curve.

[0032] The test results calculated using the above formula are shown in Table 1 below: Table 1:

[0033] Therefore, the test curves and data show that the fabric has high stiffness, good compression resistance, support, and good compression resilience.

[0034] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A variable thickness transversely woven weft-inserted interlocking fabric, characterized in that, The variable thickness horizontal knitted weft-inserted spacer fabric uses a double-layer variable plain knit cylindrical structure woven from face yarn A as the face structure to form the upper and lower face layers of the variable thickness horizontal knitted weft-inserted spacer fabric; the weft yarn B is inserted into the face structure through a yarn guide; the spacer yarn C is woven in a "V" shape with double-sided loops to interlock the upper and lower face layers to form the spacer fabric. The double-layer variable plain knit cylindrical structure is a composite structure woven with alternating plain knit and full plain knit according to a specific loop index ratio; due to the different loop indices on different needles on the same horizontal row, the same horizontal row of the upper and lower surface layers forms a concave-convex structure of different thicknesses. The spacer yarn C is woven into a double-sided loop in a "V" shape, including: woven into loops with alternating needles on the front and back needle beds, and the spacer yarn C is arranged in a "V" shape; When the yarn A is looped on the odd-numbered needles of the front and rear needle beds, the spacer yarn C is looped on the even-numbered needles of the front and rear needle beds; when the yarn A is looped on the even-numbered needles of the front and rear needle beds, the spacer yarn C is looped on the odd-numbered needles of the front and rear needle beds. The floating thread formed when the yarn A is looped on odd or even needles is pressed onto the loop woven on the corresponding needle to fix the spacer thread C.

2. The variable thickness weft-knitted spacer fabric according to claim 1, characterized in that, The yarn A is T400, the fineness of the yarn A is 300D, and it is woven from two strands.

3. The variable thickness cross-knitted weft-inserted spacer fabric according to claim 1, characterized in that, The weft yarn B is ultra-high molecular weight polyethylene multifilament, and the fineness of the weft yarn B is 300D.

4. The variable thickness weft-knitted spacer fabric according to claim 1, characterized in that, The spacer wire C is a polyester monofilament, and the diameter of the spacer wire C is 0.25 mm.

5. A method for weaving a variable thickness cross-knitted weft-inserted spacer fabric, the method being applicable to the variable thickness cross-knitted weft-inserted spacer fabric as described in any one of claims 1 to 4, characterized in that, The method employs a multi-system, multi-needle bed computerized flat knitting machine with sinkers for knitting, and the method includes: S1. Yarn A is knitted with full stitches for 1 row on each of the front and back needle beds, or with skipped stitches for n rows to form the upper and lower surface layers, where n is the stitch count and n>0; S2. Insert the weft yarn B into the fabric structure; S3. Spacer yarn C is woven in a "V" shape on the odd-numbered needles of the front and rear needle beds to connect the upper surface layer to the lower surface layer. S4. The yarn A is knitted in circles on the even number of needles of the front and rear needle beds; S5. Repeat steps S1 to S4 multiple times to obtain a variable thickness horizontally woven weft-inserted spacer fabric, the difference being that: the spacer yarn C is woven in a "V" shape on the even-numbered needles of the front and rear needle beds to connect the upper surface layer with the lower surface layer, and the face yarn A is looped on the odd-numbered needles of the front and rear needle beds.

6. The weaving method for a variable thickness horizontally woven weft-inserted interlocking fabric according to claim 5, characterized in that, The fineness of the weft yarn B is less than 2 / 3 of the spacing between the front and rear needle beds, and it does not affect the weaving of the spacer yarn C.

7. The weaving method for a variable thickness horizontally woven weft-inserted interlocking fabric according to claim 5, characterized in that, The number of needles that the spacer wire C crosses is m, where m ≤ 10 needles.

8. The weaving method for a variable thickness horizontally woven weft-inserted interlocking fabric according to claim 5, characterized in that, During the knitting process: the needles on the front and rear needle beds are configured to match the needles.

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