Knitted bed cap

Abstract

The application provides a knitted bed cap. The knitted bed cap comprises a cap surface and a surrounding edge connected with the periphery of the cap surface, and the cap surface and the surrounding edge are both knitted fabrics. The surrounding edge comprises supporting fibers and elastic fibers. In the direction from top to bottom, the surrounding edge is divided into an upper section, a middle section and a lower section. The mass percentage of the elastic fibers in the upper section, the middle section and the lower section is different. In the direction from the upper section to the lower section, the mass percentage of the elastic fibers in the surrounding edge gradually increases. In the application, in the direction from the upper section to the lower section, the mass percentage of the elastic fibers in the surrounding edge gradually increases, which can realize the matching between the distribution of the elastic fibers and the stress demand from the overall structure of the surrounding edge, and solve the problems of mismatched stress in the composite area, poor mattress adaptability, easy relaxation failure of the bottom and the like caused by the uniform and consistent elastic surrounding edge structure.

Description

Technical Field

[0001] This application relates to the field of textile technology, and more particularly to a knitted fitted sheet. Background Technology

[0002] Fitted sheets, as bedding items used to cover mattresses, are receiving increasing attention for their tactile comfort and functional adaptability. A fitted sheet typically consists of a fitted surface that covers the upper surface of the mattress and sidewalls that connect to the edges of the fitted surface and extend downwards to form the side walls. The bottom edge of the sidewalls usually has an elastic band, which secures the fitted sheet to the mattress by contraction. Fitted sheets are subjected to repeated putting on and taking off and stretching during use, and they bear alternating loads in everyday scenarios such as turning over and getting up. Therefore, the elasticity and structural reliability of the sidewalls directly affect the lifespan of the fitted sheet and the user experience.

[0003] In related technologies, fitted sheet edgings are generally made of single-knit or double-knit fabric. However, the composite area between the edging and the fitted sheet is prone to delamination, the middle section of the edging cannot fit mattresses of different thicknesses, and the bottom of the edging is prone to loosening and failure due to long-term high tension. Summary of the Invention

[0004] This application provides a knitted fitted sheet to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the technical solution of this application is as follows: This application provides a knitted fitted sheet, which includes a fitted sheet and a perimeter connected to the perimeter of the fitted sheet. Both the fitted sheet and the perimeter are knitted fabrics. The perimeter includes supporting fibers and elastic fibers. Along the direction from top to bottom, the perimeter is divided into an upper section, a middle section, and a lower section. The mass percentage of elastic fibers in the upper section, the middle section, and the lower section are all different, and along the direction from the upper section to the lower section, the mass percentage of elastic fibers in the perimeter gradually increases.

[0006] In one embodiment of this application, the supporting fiber includes at least one of polyester fiber, polyamide fiber, polypropylene fiber, and cotton fiber.

[0007] In one embodiment of this application, the elastic fiber includes polyurethane fiber and / or polyolefin elastic fiber.

[0008] In one embodiment of this application, the mass percentage of elastic fibers in the upper section of the edging is 7%-9%, preferably 7.5%-9%.

[0009] In one embodiment of this application, the longitudinal dimension of the upper segment is 3cm-5cm, preferably 3.5cm-5cm.

[0010] In one embodiment of this application, the mass percentage of elastic fibers in the edging located in the middle section is 10%-12%, preferably 10.5%-12%.

[0011] In one embodiment of this application, the longitudinal dimension of the middle section is 25cm-30cm, preferably 26cm-30cm.

[0012] In one embodiment of this application, the mass percentage of elastic fibers in the lower section of the edging is 14%-16%, preferably 14.5%-16%.

[0013] In one embodiment of this application, the longitudinal dimension of the lower segment is 4cm-6cm, preferably 4.5cm-6cm.

[0014] In one embodiment of this application, the knitted fitted sheet further includes arc-shaped reinforcing membranes disposed on the inner sides of the four corners, the top surface of each reinforcing membrane being connected to the inner side of the corner of the fitted sheet, and the bottom surface of the reinforcing membrane being connected to the top corner of the edging; except for the four corners, the edging is connected to the perimeter of the fitted sheet by hot melt adhesive.

[0015] In one embodiment of this application, the material of the reinforcing film is the same as the material of the hot melt adhesive.

[0016] In one embodiment of this application, the hot melt adhesive comprises thermoplastic polyurethane.

[0017] In one embodiment of this application, the sealing surface includes a skin-friendly moisture-absorbing surface layer and a moisture-wicking bottom layer. The skin-friendly moisture-absorbing surface layer and the moisture-wicking bottom layer are connected by a moisture-wicking connecting wire. A gap is left between the skin-friendly moisture-absorbing surface layer and the moisture-wicking bottom layer to form an air layer. The moisture-wicking connecting wire includes shaped fibers.

[0018] The technical solution provided in this application has at least the following beneficial effects: In this application, the edge is divided into upper, middle, and lower sections from top to bottom. By synergistically controlling the elastic fiber content, coil weave structure, and spandex feeding tension, the edge achieves differentiated elastic response capabilities at different heights. The upper section uses a lower elastic fiber content combined with a high-density plain weave to ensure the elongation of the edge and the fitted sheet is roughly matched, reducing shear stress in the composite area and mitigating issues like delamination caused by elasticity mismatch. The middle section uses a medium-to-high elastic fiber content combined with a mesh weft-knit structure and lower spandex feeding tension to provide sufficient elastic elongation to withstand the main tensile deformation during fitted sheet installation, allowing the fitted sheet to fit mattresses of varying thicknesses from 5cm to 35cm. The lower section uses the highest elastic fiber content combined with an inner fish-scale coil weave and higher spandex feeding tension to provide high rebound tension and tightening force, ensuring the fitted sheet tightly wraps around the mattress bottom edge and preventing slippage due to insufficient elasticity. The aforementioned technical features support and complement each other, achieving a match between elastic distribution and stress requirements at the overall edge structure level. This solves a series of problems existing in uniform elastic edge structures, such as mismatched stress in composite areas, poor mattress adaptability, and easy loosening and failure of the bottom.

[0019] In this application, the arc-shaped reinforcing membrane can alleviate stress concentration in the corner areas of the fitted sheet. When the corners of the fitted sheet are stretched, the arc-shaped reinforcing membrane can disperse the local tensile stress over a larger area, reducing the stress level per unit area, thereby reducing the risk of delamination at the seams and yarn breakage in the corner areas of the fitted sheet, and improving the service life of the fitted sheet. By placing the reinforcing membrane on the inner side of the four corners of the fitted sheet, the structural strength can be improved while ensuring a smooth and seamless appearance on the front of the fitted sheet, improving aesthetics. The arc-shaped reinforcing membrane works in conjunction with the three-section gradient high-elastic edge banding: the former provides local reinforcement at stress concentration points, while the latter optimizes the tension distribution along the overall height of the edge banding; under their synergistic effect, the breaking strength of the corner seams is significantly improved compared to ordinary uniform elastic unreinforced structures, ensuring connection strength even under large tensile loads, and significantly improving the overall service life of the fitted sheet. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0021] In the attached diagram: Figure 1 This is a schematic diagram of the structure of the knitted fitted sheet of this application.

[0022] The attached figures are labeled as follows: Kasamen 1; Border 2, upper section 21, middle section 22, lower section 23; Reinforcing membrane 3; Smooth transition zone 4. Detailed Implementation

[0023] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that all directional indications (such as up, down, inside, outside, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In related technologies, fitted sheet edging is generally made of single-knit or double-knit fabric. However, the mechanical forces exerted by the edging vary considerably at different heights: the connection area between the upper end of the edging and the fitted sheet... This area is a stress concentration zone, experiencing high shear force during tension, making the adhesive layer prone to delamination and the concealed seams prone to breakage. The middle section of the edge covers the mattress sidewalls and bears the main tensile deformation during fitted sheet installation. The bottom of the edge is the sealing and fixing area, which should provide sustained tension to prevent the fitted sheet from slipping off during use. Existing edge designs use a uniformly elastic structure, which cannot accommodate the differentiated mechanical needs of the aforementioned areas. This results in a mismatch between the elasticity of the upper edge and the fitted sheet, leading to delamination of the adhesive layer in the composite area between them. The middle section of the edge cannot accommodate mattresses of different thicknesses, and the bottom of the edge, subjected to high tension over time, is prone to loosening and failure.

[0027] In view of the above-mentioned technical problems, one embodiment of this application provides a knitted fitted sheet, such as... Figure 1As shown, the knitted fitted sheet includes a fitted sheet 1 and a perimeter 2 connected to the perimeter of the fitted sheet 1. Both the fitted sheet 1 and the perimeter 2 are knitted fabrics. The perimeter 2 includes supporting fibers and elastic fibers. Along the direction from top to bottom, the perimeter 2 is divided into an upper section 21, a middle section 22 and a lower section 23. The mass percentage of elastic fibers in the upper section 21, the middle section 22 and the lower section 23 are different, and along the direction from the upper section 21 to the lower section 23, the mass percentage of elastic fibers in the perimeter 2 gradually increases. In this application, the edge is divided into upper, middle, and lower sections from top to bottom. By synergistically controlling the elastic fiber content, coil weave structure, and spandex feeding tension, the edge achieves differentiated elastic response capabilities at different heights. The upper section uses a lower elastic fiber content combined with a high-density plain weave to ensure the elongation of the edge and the fitted sheet is roughly matched, reducing shear stress in the composite area and mitigating issues like delamination caused by elasticity mismatch. The middle section uses a medium-to-high elastic fiber content combined with a mesh weft-knit structure and lower spandex feeding tension to provide sufficient elastic elongation to withstand the main tensile deformation during fitted sheet installation, allowing the fitted sheet to fit mattresses of varying thicknesses from 5cm to 35cm. The lower section uses the highest elastic fiber content combined with an inner fish-scale coil weave and higher spandex feeding tension to provide high rebound tension and tightening force, ensuring the fitted sheet tightly wraps around the mattress bottom edge and preventing slippage due to insufficient elasticity. The aforementioned technical features support and complement each other, achieving a match between elastic distribution and stress requirements at the overall edge structure level. This solves a series of problems existing in uniform elastic edge structures, such as mismatched stress in composite areas, poor mattress adaptability, and easy loosening and failure of the bottom.

[0028] In one embodiment of this application, the supporting fiber includes at least one selected from polyester fiber, polyamide fiber, polypropylene fiber, and cotton fiber. The elastic fiber includes polyurethane fiber (i.e., spandex) and / or polyolefin elastic fiber.

[0029] In one embodiment of this application, the outer surface 1 is made of weft-knitted fabric. The edging 2 is made using an integrated weaving process; exemplarily, it can be woven using a 28-needle electronic selector single-sided circular knitting machine equipped with an electronic positive yarn feed system. The upper section 21 uses a plain weave structure, and the middle section 22 uses a weft-knitted structure with mesh openings, the mesh opening diameter being 0.8mm-1.2mm. The inner side of the lower section 23 has an anti-slip texture, such as a fish-scale texture. The mass percentage of elastic fiber in the edging 2 of the upper section 21 is 7%-9%, preferably 7.5%-9%. The longitudinal dimension of the upper section 21 (i.e., the width of the upper fabric section) is 3cm-5cm, preferably 3.5cm-5cm. The mass percentage of elastic fiber in the edging 2 of the middle section 22 is 10%-12%, preferably 10.5%-12%. The longitudinal dimension of the middle section 22 is 25cm-30cm, preferably 26cm-30cm. The elastic fiber content in the edging 2 of the lower section 23 is 14%-16% by mass, preferably 14.5%-16%. The longitudinal dimension of the lower section 23 is 4cm-6cm, preferably 4.5cm-6cm. A smooth transition zone 4 is provided between adjacent sections, with a longitudinal dimension of 1.5mm-2.5mm, and the smooth transition zone 4 has a multi-row structure. During the weaving process, the number of tuck stitches is gradually increased or decreased from top to bottom row by row, and the spandex feeding tension and ground yarn feed are simultaneously finely adjusted to achieve a smooth switch between the structure and elasticity, and the entire edging has no transverse splicing seams. For example, the smooth transition zone 4 (plain weave → mesh weft knit, 12 weaving rows) between the upper section 21 and the middle section 22 adopts a linear gradient method with the number of loop stitches increasing column by column: Columns 1-3 start from the plain weave state of the upper section with all loops, gradually increasing the proportion of loop warp rows according to the weave cycle of the middle section; Columns 4-9, according to the weave cycle of the middle section, gradually perfecting the loop arrangement to form regular mesh units; Columns 10-12 stabilize into the standard mesh structure of the middle section. Synchronous linkage control: the spandex feeding tension, loop length, and spandex yarn feed rate increase linearly from the parameters of the upper section to the parameters of the middle section, the ground yarn feed is synchronously compensated with the loop length, the fabric weight fluctuation in the transition zone is controlled within ±8g / ㎡, and there are no obvious horizontal stripe defects or stress abrupt changes. The transition zone between the middle and lower sections (mesh weft knitting → reverse fish scale texture, a total of 15 weaving rows) adopts a two-stage gradual change method of first closing the mesh and then raising the texture: in rows 1-6, the number of loop stitches on the front mesh is reduced row by row, gradually returning to a fully looped plain weave state, completing the smooth transition of the front of the structure; in rows 7-12, the number of loop stitches on the reverse side is increased row by row, and the fish scale-like micro-convex texture gradually appears; in rows 13-15, it stabilizes into the standard reverse fish scale texture of the lower section.Synchronous linkage control: the spandex feeding tension and spandex yarn feeding rate continue to increase linearly from the middle section parameters to the lower section parameters, the coil length decreases linearly from the middle section parameters to the lower section parameters, and the ground yarn feeding amount is compensated accordingly to ensure that the fabric surface inside and outside the transition zone is flat, without organizational jumps and abrupt changes in elasticity.

[0030] In this application, the edging 2 is made using an integrated weaving process. By dynamically adjusting the spandex yarn feeding rate in segments, and coordinating the control of the feeding tension and the coil structure, a gradient change in the elastic fiber content is achieved. There are no transverse splicing composite areas. While maintaining the overall seamless feel of the edging 2, problems such as protrusions, snagging, and breakage caused by splicing or composite are avoided.

[0031] In this application, the edge 2 located in the lower section 23 increases friction through anti-slip texture to prevent the fitted sheet from slipping during use.

[0032] In one embodiment of this application, the knitted fitted sheet further includes arc-shaped reinforcing films 3 disposed on the inner sides of the four corners. The top surface of each reinforcing film 3 is connected to the inner side of the corner of the fitted sheet, and the bottom surface of the reinforcing film 3 is connected to the top corner of the edging. Except for the four corners, the edging 2 is connected to the perimeter of the fitted sheet 1 by hot melt adhesive. The material of the reinforcing film is the same as the material of the hot melt adhesive. The hot melt adhesive includes thermoplastic polyurethane (TPU). Specifically, hot pressing is performed at a temperature of 120℃-150℃ and a pressure of 0.3MPa-0.5MPa. The hot melt adhesive melts and penetrates into the interior of the fitted sheet fabric and the edging fabric. After cooling, a seamless adhesive layer is formed, which can ensure the flatness of the fitted sheet surface and avoid the problem of pinhole leakage channels caused by the sewing technique used in the prior art, thereby enhancing the mite-proof barrier effect.

[0033] In this application, the arc-shaped reinforcing membrane 3 can alleviate the stress concentration problem in the corner areas of the fitted sheet. When the corners of the fitted sheet are stretched, the arc-shaped reinforcing membrane 3 can disperse the local tensile stress to a larger area, reducing the stress level per unit area, thereby reducing the risk of delamination and yarn breakage at the corners of the fitted sheet and improving the service life of the fitted sheet. By placing the reinforcing membrane 3 on the inner side of the four corners of the fitted sheet, the structural strength can be improved while ensuring a smooth and seamless appearance on the front of the fitted sheet, improving aesthetics. The arc-shaped reinforcing membrane works in conjunction with the three-section gradient high-elastic edge: the former provides local reinforcement at stress concentration points, while the latter optimizes the tension distribution along the overall height of the edge; under their synergistic effect, the breaking strength of the corner joint is significantly improved compared to ordinary uniform elastic unreinforced structures, ensuring connection strength even under large tensile loads and significantly improving the overall service life of the fitted sheet.

[0034] In this application, a reinforcing film 3 of the same material as the hot melt adhesive is selected, which can ensure that the two have good compatibility during the hot pressing process, form a continuous bonding interface, and improve the composite strength.

[0035] In one embodiment of this application, the outer shell 1 includes a skin-friendly, moisture-absorbing surface layer and a moisture-wicking bottom layer. The skin-friendly, moisture-absorbing surface layer and the moisture-wicking bottom layer are connected by a moisture-wicking connecting thread, with a gap between them to form an air layer. The moisture-wicking connecting thread includes shaped fibers. In other words, the skin-friendly, moisture-absorbing surface layer is located on the top surface of the outer shell 1, and the moisture-wicking bottom layer is located on the bottom surface of the outer shell 1. The skin-friendly, moisture-absorbing surface layer includes cellulose fibers, and the moisture-wicking bottom layer includes hydrophobic fibers with an irregular cross-section. The cellulose fibers include at least one of modal fibers, cotton fibers, viscose fibers, and lyocell fibers. The hydrophobic fibers include polyester fibers (i.e., polyester) and / or polyamide fibers. The shaped fibers include polyamide fibers (i.e., nylon) and / or polyester fibers with an irregular cross-section. Examples of irregular cross-sections include trefoil shapes, cross shapes, etc.

[0036] In this application, the molecular chains of cellulose fibers such as Modal contain a large number of hydroxyl groups, which can quickly bind liquid water molecules through hydrogen bonds, promptly removing sweat from the skin surface and preventing the formation of a continuous water film that causes a sticky feeling. However, the diffusion rate of water inside cellulose fibers such as Modal is much lower than the transport rate on the fiber surface. If sweat is not promptly removed, it will accumulate in the surface yarns, causing a damp feeling. Liquid water cannot be continuously transported through the air; the connecting filaments are the only solid moisture-wicking path and also the bottleneck of the entire system. Ordinary fibers have smooth surfaces, weak capillary effects, and low moisture flux, so sweat can only be slowly transferred point-to-point, resulting in a large amount remaining in the surface fabric and causing a damp feeling. Shaped fibers with irregular cross-sections (such as trefoil or cross-shaped) have continuous microgrooves on their surfaces, which can generate strong capillary attraction, quickly conducting surface sweat to the underlying layers. Meanwhile, the microgroove structure allows sweat to spread laterally along the fiber surface, dispersing locally concentrated sweat to a larger area of ​​the bottom layer and preventing rapid saturation at a single point. Ordinary polyester fibers are hydrophobic, meaning water molecules cannot penetrate the fiber interior and can only spread and flow on the fiber surface. With the addition of an irregular cross-section, the fiber's specific surface area is significantly increased, allowing sweat transported through connecting fibers to spread into an extremely thin water film, increasing the contact area between water molecules and air, and accelerating the sweat evaporation rate. The sweat changes from a liquid to a gaseous state and diffuses into the environment, completing the moisture removal process. Simultaneously, it continuously consumes the liquid water in the bottom layer, keeping the bottom layer in a perpetually unsaturated state, providing a continuous driving force for the forward transport of sweat.

[0037] Furthermore, the use of terms such as "first," "second," and "third" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" in this application merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0038] Example 1 This embodiment provides a method for producing a fitted sheet, such as... Figure 1 As shown, the fitted sheet includes a fitted sheet 1, a reinforcing membrane 3, and a edging 2 connected to the fitted sheet 1 around its perimeter. The fitted sheet 1 is made of weft-knitted fabric. The edging 2 is made of polyester and spandex. Along the top-to-bottom direction, the edging 2 is divided into an upper section 21, a middle section 22, and a lower section 23. The upper section 21 is made of polyester and spandex in a mass ratio of 91:9, and uses a plain weave structure. The longitudinal dimension of the upper section (i.e., the width of the upper fabric section) is 3 cm. The middle section 22 is made of polyester and spandex in a mass ratio of 90:10, and uses a weft-knitted structure with a mesh opening diameter of 0.8 mm. The longitudinal dimension of the middle section 22 is 28 cm. The lower section 23 is made of polyester and spandex in a mass ratio of 86:14, and the inner side of the lower section 23 has a fish-scale anti-slip texture. The longitudinal dimension of the lower section 23 is 6 cm. The outer shell 1 comprises a skin-friendly, moisture-absorbing surface layer and a moisture-wicking bottom layer, which are connected by moisture-wicking connecting threads. A gap exists between the two layers to form an air layer. The skin-friendly, moisture-absorbing surface layer is made of modal fiber, and the moisture-wicking bottom layer is made of polyester fiber with a cross-shaped cross-section. The moisture-wicking connecting threads are made of nylon with a cross-shaped cross-section. The top and bottom surfaces of the reinforcing membrane 3 are connected to the inner sides of the four corners of the outer shell 1 and the four corners of the top edge 2, respectively. Except for the four corners, the edge 2 is connected to the perimeter of the outer shell 1 by hot melt adhesive. The material of the reinforcing membrane 3 is the same as that of the hot melt adhesive, both being thermoplastic polyurethane (TPU).

[0039] The specific steps for manufacturing this fitted sheet are as follows: S1. Weaving of the edging fabric: The edging fabric is woven in three sections using an integrated weaving process (specifically, using a 28-needle electronic needle selection single-sided circular knitting machine equipped with an electronic positive yarn feeding system) to obtain the edging fabric. In the first section (upper section 21), the spandex feed tension is 10cN, the loop length is 3.0mm / needle, and all needles perform loop-forming actions to weave a high-density plain weave padding structure. In the second section (middle section 22), the spandex feed tension is 14cN, and the loop length is 3.4mm / needle. The mesh structure is achieved through an electronic needle selection and tucking process: the needles are controlled to perform a combination of loop-forming and tucking actions row by row. Some needles form loops normally, while others tuck without slipping. The tucking arc arches the loops to form a uniform mesh. By matching the tucking ratio with the loop length, the finished mesh aperture is stabilized at 0.8mm. In the third section (lower section 23), the spandex feed tension is 12cN, and the loop length is 3.2mm. / Needle; The fish-scale anti-slip texture is achieved through the reverse gathering process: the entire gathering arc is retained on the inside of the fabric, the front side remains flat, and the inside side forms a fish-scale micro-convex texture. The friction coefficient is increased by the concave and convex structure, and no additional anti-slip coating is required. Between two adjacent sections, there is a smooth transition zone 4 with a longitudinal dimension of 2mm, consisting of multiple horizontal rows. The number of tuck stitches is gradually increased or decreased in each horizontal row, and the spandex feeding tension and ground yarn feeding amount are simultaneously finely adjusted to achieve a smooth switch between the structure and elasticity. The entire edging has no horizontal splicing seams. Specifically: The smooth transition zone 4 (plain weave → mesh weft knit, 12 weaving rows) between the upper section 21 and the middle section 22 adopts a linear gradient with a progressively increasing number of loop stitches: Rows 1-3 start from the plain weave state of the upper section with all loops, gradually increasing the proportion of loops in the warp rows, and gradually perfecting the loop arrangement according to the weave cycle of the middle section; Rows 4-9, according to the weave cycle of the middle section, perfecting the loop arrangement column by column, forming regular mesh units; Rows 10-12 stabilize into the standard mesh structure of the middle section. Synchronous linkage control: the spandex feeding tension, loop length, and spandex yarn feed rate increase linearly from the parameters of the upper section to the parameters of the middle section, and the ground yarn feed is synchronously compensated with the loop length. The fabric weight fluctuation in the transition zone is controlled within ±8g / ㎡, with no obvious horizontal stripe defects or stress abrupt changes.

[0040] The transition zone between the middle and lower sections (mesh weft knitting → reverse fish scale texture, 15 weaving rows in total) adopts a two-stage gradual transition method: first, the mesh is closed, then the texture is established. In rows 1-6, the number of loop stitches on the front mesh is reduced row by row, gradually returning to a fully looped plain weave, completing the smooth transition of the front side of the structure. In rows 7-12, the number of loop stitches on the reverse side is increased row by row, and the slightly raised fish scale texture gradually appears. In rows 13-15, the structure stabilizes into the standard reverse fish scale texture of the lower section. Synchronous linkage control: the spandex feed tension and spandex yarn feed rate continue to increase linearly from the middle section parameters to the lower section parameters, the loop length decreases linearly from the middle section parameters to the lower section parameters, and the ground yarn feed amount is compensated accordingly to ensure that the fabric surface inside and outside the transition zone is flat, without abrupt changes in structure or elasticity.

[0041] S2. Weaving of the outer fabric: The air layer fabric is formed by integrated weaving on a large circular knitting machine. The air layer fabric has a modal fiber fabric as the outer layer, a polyester fiber fabric with a cross-shaped cross section as the bottom layer, and nylon with a cross-shaped cross section as the connecting yarn to obtain the outer fabric. S3. Preparation of fitted sheet: Place TPU film on the inside of the four corners of the fitted sheet fabric, and coat the four sides of the fitted sheet fabric with TPU adhesive except for the four corners. Then, bond the four sides of the edge fabric with the four sides of the fitted sheet fabric by hot pressing at a temperature of 135℃ and a pressure of 0.4MPa to obtain the fitted sheet.

[0042] Example 2 This embodiment provides a method for producing a fitted sheet, such as... Figure 1 As shown, the fitted sheet includes a fitted sheet 1, a reinforcing membrane, and a edging 2 connected to the four sides of the fitted sheet 1. The fitted sheet 1 is made of weft-knitted fabric. The edging 2 is made of polyester and spandex. Along the top-to-bottom direction, the edging 2 is divided into an upper section 21, a middle section 22, and a lower section 23. The upper section 21 is made of polyester and spandex in a mass ratio of 92:8, and has a plain weave structure. The longitudinal dimension of the upper section 21 is 4 cm. The middle section 22 is made of polyester and spandex in a mass ratio of 89:11, and has a weft-knitted structure with a mesh opening diameter of 1.0 mm. The longitudinal dimension of the middle section 22 is 25 cm. The lower section 23 is made of polyester and spandex in a mass ratio of 85:15, and has a fish-scale anti-slip texture on the inner side. The longitudinal dimension of the lower section 23 is 5 cm. The outer shell 1 comprises a skin-friendly, moisture-absorbing surface layer and a moisture-wicking bottom layer, which are connected by moisture-wicking connecting threads. A gap exists between the two layers to form an air layer. The skin-friendly, moisture-absorbing surface layer is made of modal fiber, and the moisture-wicking bottom layer is made of polyester fiber with a cross-shaped cross-section. The moisture-wicking connecting threads are made of nylon with a cross-shaped cross-section. The top and bottom surfaces of the reinforcing membrane are connected to the inner sides of the four corners of the outer shell 1 and the top four corners of the edge 2, respectively. Except for the four corners, the edge 2 is connected to the perimeter of the outer shell 1 using hot melt adhesive. The material of the reinforcing membrane is the same as that of the hot melt adhesive, both being thermoplastic polyurethane (TPU).

[0043] The specific steps for manufacturing this fitted sheet are as follows: S1. Weaving of the edging fabric: The edging fabric is woven in three sections using an integrated weaving process to obtain the edging fabric. In the first section (upper section 21), the spandex feed tension is 9 cN, the loop length is 2.9 mm / needle, and all needles perform loop-forming actions to weave a high-density plain weave padding structure. In the second section (middle section 22), the spandex feed tension is 15 cN, and the loop length is 3.5 mm / needle. The mesh structure is achieved through an electronic needle selection and tucking process: the needles are controlled to perform a combination of loop-forming and tucking actions row by row. Some needles form loops normally, while others tuck without slipping. The tucking arc arches the loops to form a uniform mesh. By matching the tucking ratio with the loop length, the finished mesh diameter is stabilized at 1.0 mm. In the third section (lower section 23), the spandex feed tension is 13 cN, and the loop length is 3.1 mm. / Needle; The fish-scale anti-slip texture is achieved through the reverse gathering process: the entire gathering arc is retained on the inside of the fabric, the front side remains flat, and the inside side forms a fish-scale micro-convex texture. The friction coefficient is increased by the concave and convex structure, and no additional anti-slip coating is required. Between two adjacent sections, there is a multi-column smooth transition zone 4 with a longitudinal dimension of 2mm. The number of tuck stitches is gradually increased or decreased in each column, and the spandex feeding tension and ground yarn feeding amount are simultaneously finely adjusted to achieve a smooth switch between the structure and elasticity. The entire edging has no transverse splicing seams. Specifically: The smooth transition zone 4 (plain weave → mesh weft knit, 12 weaving rows) between the upper section 21 and the middle section 22 adopts a linear gradient with a progressively increasing number of loop stitches: Rows 1-3 start from the plain weave state of the upper section with all loops, gradually increasing the proportion of loops in the warp rows, and gradually perfecting the loop arrangement according to the weave cycle of the middle section; Rows 4-9, according to the weave cycle of the middle section, gradually perfecting the loop arrangement to form regular mesh units; Rows 10-12 stabilize into the standard mesh structure of the middle section. Synchronous linkage control: the spandex feeding tension, loop length, and spandex yarn feed rate increase linearly from the parameters of the upper section to the parameters of the middle section, and the ground yarn feed amount is synchronously compensated with the loop length. The fabric weight fluctuation in the transition zone is controlled within ±8g / ㎡, with no obvious horizontal stripe defects or stress abrupt changes.

[0044] The transition zone between the middle and lower sections (mesh weft knitting → reverse fish scale texture, 15 weaving rows in total) adopts a two-stage gradual transition method: first, the mesh is closed, then the texture is established. In rows 1-6, the number of loop stitches on the front mesh is reduced row by row, gradually returning to a fully looped plain weave, completing the smooth transition of the front side of the structure. In rows 7-12, the number of loop stitches on the reverse side is increased row by row, and the slightly raised fish scale texture gradually appears. In rows 13-15, the structure stabilizes into the standard reverse fish scale texture of the lower section. Synchronous linkage control: the spandex feed tension and spandex yarn feed rate continue to increase linearly from the middle section parameters to the lower section parameters, the loop length decreases linearly from the middle section parameters to the lower section parameters, and the ground yarn feed amount is compensated accordingly to ensure that the fabric surface inside and outside the transition zone is flat, without abrupt changes in structure or elasticity.

[0045] S2. Weaving of the outer fabric: The air layer fabric is formed by integrated weaving on a large circular knitting machine. The air layer fabric has a modal fiber fabric as the outer layer, a polyester fiber fabric with a cross-shaped cross section as the bottom layer, and nylon with a cross-shaped cross section as the connecting yarn to obtain the outer fabric. S3. Preparation of fitted sheet: Place TPU film on the inside of the four corners of the fitted sheet fabric, and coat the four sides of the fitted sheet fabric with TPU adhesive except for the four corners. Then, bond the four sides of the edge fabric with the four sides of the fitted sheet fabric by hot pressing at a temperature of 150℃ and a pressure of 0.3MPa to obtain the fitted sheet.

[0046] Example 3 This embodiment provides a method for producing a fitted sheet, such as... Figure 1 As shown, the fitted sheet includes a fitted sheet 1, a reinforcing membrane, and a edging 2 connected to the fitted sheet 1 around its perimeter. The fitted sheet 1 is made of weft-knitted fabric. The edging 2 is made of polyester and spandex. Along the top-to-bottom direction, the edging 2 is divided into an upper section 21, a middle section 22, and a lower section 23. The upper section 21 is made of polyester and spandex in a mass ratio of 93:7, and uses a plain weave structure. The longitudinal dimension of the upper section 21 is 5cm. The middle section 22 is made of polyester and spandex in a mass ratio of 88:12, and uses a weft-knitted structure with a mesh opening diameter of 1.2mm. The longitudinal dimension of the middle section 22 is 30cm. The lower section 23 is made of polyester and spandex in a mass ratio of 84:16, and the inner side of the lower section 23 has a fish-scale anti-slip texture. The longitudinal dimension of the lower section 23 is 4cm. The outer shell 1 comprises a skin-friendly, moisture-absorbing surface layer and a moisture-wicking bottom layer, which are connected by moisture-wicking connecting threads. A gap exists between the two layers to form an air layer. The skin-friendly, moisture-absorbing surface layer is made of modal fiber, and the moisture-wicking bottom layer is made of polyester fiber with a cross-shaped cross-section. The moisture-wicking connecting threads are made of nylon with a cross-shaped cross-section. The top and bottom surfaces of the reinforcing membrane are connected to the inner sides of the four corners of the outer shell 1 and the four corners of the top edge 2, respectively. Except for the four corners, the edge 2 is connected to the perimeter of the outer shell 1 using hot melt adhesive. The reinforcing membrane and the hot melt adhesive are made of the same material, thermoplastic polyurethane.

[0047] The specific steps for manufacturing this fitted sheet are as follows: S1. Weaving of the edging fabric: The edging fabric is woven in three sections using an integrated weaving process to obtain the edging fabric. In the first section (upper section 21), the spandex feed tension is 10cN, the loop length is 2.8mm / needle, and all needles perform loop-forming actions to weave a high-density plain weave padding structure. In the second section (middle section 22), the spandex feed tension is 16cN, and the loop length is 3.6mm / needle. The mesh structure is achieved through an electronic needle selection and tucking process: the needles are controlled to perform a combination of loop-forming and tucking actions row by row. Some needles form loops normally, while others tuck without slipping. The tucking arc arches the loops to form a uniform mesh. By matching the tucking ratio with the loop length, the finished mesh aperture is stabilized at 1.2mm. In the third section (lower section 23), the spandex feed tension is 14cN, and the loop length is 3.0mm. / Needle; The fish-scale anti-slip texture is achieved through a reverse tucking process: all the tucking loops are retained on the inside of the fabric, the front remains flat, and the inside forms a fish-scale micro-convex texture. The friction coefficient is increased by the concave and convex structure, and no additional anti-slip coating is required; There is a smooth transition zone with a longitudinal dimension of 2mm between two adjacent sections. The number of tucking stitches is gradually increased or decreased in each horizontal row, and the spandex feeding tension and the amount of ground yarn are simultaneously finely adjusted to achieve a smooth switch between the structure and elasticity. There are no transverse seams on the overall edge; Specifically: The smooth transition zone 4 (plain weave → mesh weft knit, 12 weaving rows) between the upper section 21 and the middle section 22 adopts a linear gradient with a progressively increasing number of loop stitches: Rows 1-3 start from the plain weave state of the upper section with all loops, gradually increasing the proportion of loops in the warp rows, and gradually perfecting the loop arrangement according to the weave cycle of the middle section; Rows 4-9, according to the weave cycle of the middle section, gradually perfecting the loop arrangement to form regular mesh units; Rows 10-12 stabilize into the standard mesh structure of the middle section. Synchronous linkage control: the spandex feeding tension, loop length, and spandex yarn feed rate increase linearly from the parameters of the upper section to the parameters of the middle section, and the ground yarn feed amount is synchronously compensated with the loop length. The fabric weight fluctuation in the transition zone is controlled within ±8g / ㎡, with no obvious horizontal stripe defects or stress abrupt changes.

[0048] The transition zone between the middle and lower sections (mesh weft knitting → reverse fish scale texture, 15 weaving rows in total) adopts a two-stage gradual transition method: first, the mesh is closed, then the texture is established. In rows 1-6, the number of loop stitches on the front mesh is reduced row by row, gradually returning to a fully looped plain weave, completing the smooth transition of the front side of the structure. In rows 7-12, the number of loop stitches on the reverse side is increased row by row, and the slightly raised fish scale texture gradually appears. In rows 13-15, the structure stabilizes into the standard reverse fish scale texture of the lower section. Synchronous linkage control: the spandex feed tension and spandex yarn feed rate continue to increase linearly from the middle section parameters to the lower section parameters, the loop length decreases linearly from the middle section parameters to the lower section parameters, and the ground yarn feed amount is compensated accordingly to ensure that the fabric surface inside and outside the transition zone is flat, without abrupt changes in structure or elasticity.

[0049] S2. Weaving of the outer fabric: The air layer fabric is formed by integrated weaving on a large circular knitting machine. The air layer fabric has a modal fiber fabric as the outer layer, a polyester fiber fabric with a cross-shaped cross section as the bottom layer, and nylon with a cross-shaped cross section as the connecting yarn to obtain the outer fabric. S3. Preparation of fitted sheet: Place TPU film on the inside of the four corners of the fitted sheet fabric, and coat the four sides of the fitted sheet fabric with TPU adhesive except for the four corners. Then, bond the four sides of the edging fabric with the four sides of the fitted sheet fabric together by hot pressing at a temperature of 120℃ and a pressure of 0.5MPa to obtain the fitted sheet.

[0050] Comparative Example 1 The difference between this comparative example and Example 2 is that the edging fabric is not a three-section fabric, but a plain weave fabric made of polyester fiber and spandex in a mass ratio of 92:8.

[0051] Comparative Example 2 The difference between this comparative example and Example 2 is that the edging fabric is not a three-section fabric, but a two-section fabric. The upper section is a plain weave fabric made of polyester fiber and spandex in a mass ratio of 92:8. The longitudinal dimension of both the upper and lower sections is 17cm. The lower section is a fabric made of polyester fiber and spandex in a mass ratio of 85:15, and the inner side of the lower section is evenly distributed with fish scale-like anti-slip texture. A multi-column transition zone with a longitudinal dimension of 2mm is set between the upper and lower sections, consisting of 5 weaving columns. The transition is achieved by a direct abrupt change in weave: the first and second columns maintain the plain weave of the upper section; the third column directly switches to the weaving parameters of the tucked weave of the lower section; and the fourth and fifth columns stabilize at the standard fish-scale texture of the lower section. There is no gradual change in tucked weave across columns during the transition. The spandex feed tension, loop length, spandex yarn feed rate, and ground yarn feed amount are not linearly compensated; the parameters jump directly from the upper section to the lower section. The fabric weight fluctuation in the transition zone exceeds ±20g / ㎡, resulting in significant stress concentration and horizontal stripe defects. Under long-term alternating tension, fatigue fracture is likely to occur at the transition position.

[0052] Comparative Example 3 The difference between this comparative example and Example 2 is that TPU film was not placed on the inside of the four corners of the cover fabric. Instead, TPU adhesive was coated around the cover fabric, and the edges of the edging fabric were bonded together with the edges of the cover fabric by hot pressing at a temperature of 150°C and a pressure of 0.3 MPa.

[0053] In this comparative example, the four corners of the roof were not heat-pressed to the surrounding edges using TPU film, but rather heat-pressed using TPU adhesive.

[0054] Comparative Example 4 The difference between this comparative example and Example 2 is that the edging is not made using an integrated weaving process, but rather using TPU adhesive. The first, second, and third sections of fabric are sequentially bonded together along the axial direction by hot pressing to form two transverse hot-pressed seams. The bonding temperature is 150°C and the pressure is 0.3 MPa.

[0055] Comparative Example 5 The difference between this comparative example and Example 2 is that ordinary circular cross-section nylon is used instead of cross-shaped nylon.

[0056] test According to GB / T 3923.1-2013 Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break (Strip Method), the breaking strength (i.e., the breaking strength of the straight composite area) of fitted sheets made in Examples 1-3 and Comparative Examples 1-4 was tested. The straight composite area refers to the edge of the fitted sheet, not the corner. The sides of the samples were sealed to prevent loop slippage. The results are shown in Table 1. All samples for breaking strength testing were sealed on both sides to prevent knitted loop slippage and ensure stable and reproducible test results. Referring to FZ / T 70006-2022 Test Method for Tensile Elastic Recovery of Knitted Fabrics, a custom accelerated durability test of 1000 cycles of 50% constant elongation was used. The breaking strength at the same sampling point was tested again using the above method. The formula for breaking strength retention after 1000 cycles is: Breaking Strength after 1000 cycles = Breaking Strength after 1000 cycles / Breaking Strength before 1000 cycles. The fracture strength retention rate after 1000 cycles (i.e., the fracture strength retention rate of the straight composite region after 1000 cycles) was calculated at 100%, and the results are shown in Table 1. The breaking strength (i.e., corner breaking strength) of the fitted sheets made in Examples 1-3 and Comparative Examples 1-4 was tested according to GB / T 3923.1-2013 Textiles - Tensile Properties of Fabrics - Part 1: Determination of Breaking Strength and Elongation at Break (Strip Method). The results are shown in Table 1. Following the above method, 1000 cycles of 50% elongation (longitudinal stretching) were performed. The breaking strength of the corner areas of the fitted sheets was then tested again using the same sampling points. The corner breaking strength retention rate was calculated using the formula: Corner breaking strength retention rate after 1000 cycles = Corner breaking strength after 1000 cycles / Corner breaking strength before 1000 cycles. The fracture strength retention rate of the corner region was calculated with 100% accuracy after 1000 cycles, and the results are shown in Table 1. According to GB / T 21655.2-2009 Evaluation of the moisture absorption and quick-drying properties of textiles - Part 2: Dynamic moisture transfer method, the top surface wetting time, bottom surface wetting time, maximum top surface wetting radius, and liquid water diffusion rate of the fitted sheets made in Example 2 and Comparative Example 5 were tested, and the results are shown in Table 2.

[0057] Table 1 Mechanical Performance Test Results

[0058] Table 2 Test results of liquid water diffusion performance

[0059] As shown in Table 1, the straight composite region breaking strength, corner region breaking strength, and cyclic strength retention rate of Examples 1-3 are significantly better than those of Comparative Example 1. This result indicates that the three-segment gradient edge structure in this application can stably improve the bonding strength and fatigue resistance of the fitted sheet composite interface. Among them, all performance indicators of Example 2 are optimal values, indicating that the elastic fiber ratio, mesh size, and structural parameters of Example 2 are the optimal ratio in this application range, resulting in the best overall performance. Examples 1 and 3 correspond to differentiated specifications with low and high elastic gradients, respectively. Although the absolute strength varies slightly due to differences in mesh size and elastic orientation, they still maintain excellent interfacial reliability and can adapt to the needs of mattresses of different thicknesses.

[0060] As shown in Table 1, compared with Comparative Example 1, the breaking strength of the straight composite region in Example 2 increased by approximately 38.2%, and the breaking strength of the corner region increased by approximately 65.4%. After 1000 cycles, the strength retention rates of the straight and corner regions increased by 23 percentage points and 19 percentage points, respectively. These results indicate that by dividing the edge along the longitudinal direction into upper, middle, and lower sections, and by adjusting the elastic fiber content and weave structure in a gradient manner, the elasticity of each section can be precisely matched to the stress requirements of the corresponding region. This significantly reduces the shear stress at the interface between the edge and the fitted sheet, reduces the risk of delamination of the adhesive layer under repeated stretching, and comprehensively improves the structural reliability and service life of the fitted sheet.

[0061] As shown in Table 1, compared with Comparative Example 2, the fracture strength of the straight composite region in Example 2 increased by approximately 17.5%, the fracture strength of the corner region increased by approximately 28.4%, and the fracture strength retention rate of the straight composite region after 1000 cycles increased by 13 percentage points. This result indicates that, compared to the two-section structure, the added middle mesh transition section of the three-section structure in this application achieves a smooth transition between elasticity and structure, avoids abrupt stress changes at the junction of the two sections, further disperses the interface stress under alternating loads, improves the overall fatigue resistance of the edge, and extends the service life of the fitted sheet.

[0062] As shown in Table 1, compared with Comparative Example 3, the corner fracture strength of Example 2 increased by approximately 34.4%, and the corner fracture strength retention rate after 1000 cycles increased by 9 percentage points; while the fracture strength and retention rate of the straight composite region were basically the same for both. These results indicate that the arc-shaped reinforcing membrane can specifically disperse the concentrated stress in the corner region of the sheet, strengthen the composite interface strength at the corners, and has no negative impact on the straight region. It is an effective supplement to improve the reliability of weak points in the corners of the sheet and extend its overall service life.

[0063] As shown in Table 1, compared with Comparative Example 4, the breaking strength of the straight composite area in Example 2 increased by approximately 60.6%, and the breaking strength of the corner area increased by approximately 91.1%. After 1000 cycles, the strength retention rates of the two aspects increased by 31 percentage points and 11 percentage points, respectively. This result indicates that the three-section edge weaving using electronic needle selection eliminates the structural weakness of the transverse splicing seam, resulting in good overall fabric continuity and uniform stress distribution. Therefore, the composite interface strength and fatigue resistance are significantly superior to the segmented hot-pressing splicing scheme, effectively avoiding failure problems such as delamination, snagging, and breakage at the splicing points.

[0064] As shown in Table 2, compared with Comparative Example 5, the top surface wetting time of Example 2 was shortened by approximately 57.1%, the bottom surface wetting time was shortened by approximately 51.35%, the maximum wetting radius of the top surface was increased by 137.5%, and the liquid water diffusion rate was increased by approximately 128.6%. These results indicate that using nylon with a cross-shaped cross-section as the air-layer moisture-wicking connecting yarn can utilize the grooves on the fiber surface to generate a capillary wicking effect, accelerating the conduction rate of liquid water from the surface to the bottom layer and expanding the area for sweat spreading, thereby increasing the evaporation rate of sweat and improving the close-fitting dryness of the fitted sheet.

[0065] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A knitted fitted sheet, the fitted sheet comprising a fitted surface and a perimeter border connected to the perimeter of the fitted surface, wherein both the fitted surface and the perimeter border are knitted fabrics, characterized in that, The edging includes supporting fibers and elastic fibers. Along the top-to-bottom direction, the edging is divided into an upper section, a middle section, and a lower section. The mass percentage of elastic fibers in the upper section, middle section, and lower section are all different, and the mass percentage of elastic fibers in the edging gradually increases along the top-to-bottom direction.

2. The knitted fitted sheet as described in claim 1, characterized in that, The supporting fiber includes at least one of polyester fiber, polyamide fiber, polypropylene fiber, and cotton fiber.

3. The knitted fitted sheet as described in claim 1, characterized in that, The elastic fibers include polyurethane fibers and / or polyolefin elastic fibers.

4. The knitted fitted sheet as described in claim 1, characterized in that, The elastic fiber content in the upper section of the edging is 7%-9% by mass; And / or, the longitudinal dimension of the upper segment is 3cm-5cm.

5. The knitted fitted sheet as described in claim 1 or 4, characterized in that, The elastic fiber content in the edging located in the middle section is 10%-12% by mass; And / or, the longitudinal dimension of the middle section is 25cm-30cm.

6. The knitted fitted sheet as described in claim 5, characterized in that, The mass percentage of elastic fibers in the lower section of the edging is 14%-16%; And / or, the lower segment has a longitudinal dimension of 4cm-6cm.

7. The knitted fitted sheet as described in claim 1, characterized in that, The knitted fitted sheet also includes arc-shaped reinforcing membranes disposed on the inner sides of the four corners. The top surface of each reinforcing membrane is connected to the inner side of the corner of the fitted sheet, and the bottom surface of the reinforcing membrane is connected to the top corner of the edging. Except for the four corners, the edging is connected to the perimeter of the fitted sheet by hot melt adhesive.

8. The knitted fitted sheet as described in claim 7, characterized in that, The reinforcing film is made of the same material as the hot melt adhesive.

9. The knitted fitted sheet as described in claim 8, characterized in that, The hot melt adhesive includes thermoplastic polyurethane.

10. The knitted fitted sheet as claimed in claim 1, characterized in that, The outer shell includes a skin-friendly moisture-absorbing surface layer and a moisture-wicking bottom layer. The skin-friendly moisture-absorbing surface layer and the moisture-wicking bottom layer are connected by moisture-wicking connecting wires. A gap is left between the skin-friendly moisture-absorbing surface layer and the moisture-wicking bottom layer to form an air layer. The moisture-wicking connecting wires include irregularly shaped fibers.

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