Hollow-structured tubular fabric

Abstract

The tubular fabric with a hollow structure provided by the present invention relates to the technical field of multi-layer fabrics. The tubular fabric with a hollow structure comprises an upper fabric and a lower fabric which are connected to each other. After the upper fabric and the lower fabric are connected, the whole is in a tubular shape. The upper fabric and the lower fabric respectively comprise an upper panel, a lower panel and binding warp yarns. The binding warp yarns are used for connecting the upper panel and the lower panel, and a hollow structure is formed between the upper panel and the lower panel. Through the fabric structure design, the upper and lower panels of the tubular fabric with a hollow structure are effectively connected to form an integrally formed tubular multi-layer fabric. Moreover, according to the material usage, the wall thickness and the tubular size of the fabric can be adjusted, eliminating the need for cutting and splicing. This can not only save raw materials, but also ensure the continuity and integrity of fibers in the component, improving the mechanical properties of the material.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-layer fabrics, and more specifically, to a tubular fabric with a hollow structure. Background Art

[0002] Currently, most of the hollow fabrics prepared on the market are flat hollow fabrics. When making a cylindrical fabric, the hollow fabric needs to be wrapped around the core material and then spliced at the joints to achieve the integrity of the material. This method is inefficient and has poor stability, greatly reducing the mechanical properties of the hollow composite material.

[0003] In view of this, designing and manufacturing a tubular fabric with a hollow structure, which is integrally formed by continuous fibers and does not require splicing joints, is an urgent technical problem to be improved in the current technical field of multi-layer fabrics. Summary of the Invention

[0004] The object of the present invention includes providing a tubular fabric with a hollow structure, which includes an upper fabric and a lower fabric connected to each other. The upper fabric and the lower fabric are integrally formed by continuous fibers and are in a tubular shape as a whole after connection, eliminating the steps of cutting and splicing the fabric, having a wide range of applications and good mechanical properties.

[0005] The present invention solves its technical problems by adopting the following technical solutions.

[0006] A tubular fabric with a hollow structure provided by the present invention includes an upper fabric and a lower fabric, and the upper fabric and the lower fabric are connected to each other to form a tubular shape.

[0007] The upper fabric includes a first binding warp, at least one first upper panel, and at least one first lower panel. The first binding warp passes through both the first upper panel and the first lower panel, connecting the first upper panel and the first lower panel together, and a hollow structure is formed between the first upper panel and the first lower panel.

[0008] The lower fabric includes a second binding warp, at least one second upper panel, and at least one second lower panel. The second binding warp passes through both the second upper panel and the second lower panel, connecting the second upper panel and the second lower panel together, and a hollow structure is formed between the second upper panel and the second lower panel.

[0009] Further, each first upper panel includes first upper warp and first upper weft, and the first upper warp and the first upper weft are interwoven together. The first lower panel includes first lower warp and first lower weft, and the first lower warp and the first lower weft are interwoven together.

[0010] Further, each of the second upper layer panels includes second upper layer warp yarns and second upper layer weft yarns, and the second upper layer warp yarns and the second upper layer weft yarns are interwoven together; the second lower layer panel includes second lower layer warp yarns and second lower layer weft yarns, and the second lower layer warp yarns and the second lower layer weft yarns are interwoven together.

[0011] Further, the first upper layer panel, the second upper layer panel, the first lower layer panel, and the second lower layer panel all adopt double warp beam let-off. The first upper layer warp yarns, the second upper layer warp yarns, the first lower layer warp yarns, and the second lower layer warp yarns all adopt constant tension let-off, and the first binding warp yarns and the second binding warp yarns all adopt fixed length let-off.

[0012] The let-off amount of the first binding warp yarns is respectively greater than the let-off amounts of the first upper layer warp yarns and the first lower layer warp yarns, and the let-off amount of the second binding warp yarns is respectively greater than the let-off amounts of the second upper layer warp yarns and the second lower layer warp yarns.

[0013] Further, the cross-section of the first binding warp yarns is in the shape of X, V, 8, or I, and the cross-section of the second binding warp yarns is in the shape of X, V, 8, or I.

[0014] Further, the end of the upper layer fabric is connected to the end of the lower layer fabric, and a multi-layer corner interlock structure is adopted for connection.

[0015] Further, the warp yarns of the upper layer fabric and the warp yarns of the lower layer fabric are interwoven into a multi-layer corner interlock structure.

[0016] Further, a first hollow distance is formed between the first upper layer panel and the first lower layer panel, and the first hollow distance is 3 mm to 20 mm.

[0017] A second hollow distance is formed between the second upper layer panel and the second lower layer panel, and the second hollow distance is 3 mm to 20 mm.

[0018] Further, the upper layer fabric and the lower layer fabric respectively adopt one or several of glass fiber, carbon fiber, basalt fiber, quartz fiber, silicon carbide fiber, aramid fiber, and ultra-high molecular weight polyethylene fiber.

[0019] The tubular fabric with a hollow structure provided by the present invention has the following beneficial effects:

[0020] The tubular fabric with a hollow structure provided by the present invention has an overall tubular shape after the upper fabric and the lower fabric are connected to each other. The upper fabric and the lower fabric respectively include an upper panel, a lower panel, and interlacing warp yarns. The interlacing warp yarns are used to connect the upper panel and the lower panel, and a hollow structure is formed between the upper panel and the lower panel. Through the fabric structure design, the upper and lower panels of the tubular fabric with a hollow structure are effectively connected to form an integrally formed tubular multi-layer fabric. Moreover, according to the material usage, the wall thickness and the tubular size of the fabric can be adjusted, eliminating the need for cutting and splicing. This can not only save raw materials but also ensure the continuity and integrity of the fibers within the component, avoiding the stress concentration phenomenon caused during the splicing of the fabric and the composite material, greatly improving the integrity of the material and enhancing the mechanical properties of the material. At the same time, it can be mass-produced, greatly improving the production efficiency and laying a foundation for the further application of the hollow fabric in the field of composite materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can be obtained based on these drawings.

[0022] Figure 1 FIG. is a schematic cross-sectional structure diagram of a tubular fabric with a hollow structure provided by a specific embodiment of the present invention;

[0023] Figure 2 FIG. is a schematic cross-sectional structure diagram in the warp direction of a tubular fabric with a hollow structure provided by a specific embodiment of the present invention when a multi-layer angle interlock structure is used for connection.

[0024] Reference numerals: 110 - upper fabric; 111 - first upper panel; 113 - first lower panel; 115 - first interlacing warp yarn; 116 - first upper warp yarn; 117 - first upper weft yarn; 118 - first lower weft yarn; 119 - first lower warp yarn; 130 - lower fabric; 131 - second upper panel; 133 - second lower panel; 135 - second interlacing warp yarn; 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 - warp yarns; 23 - weft yarn. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the products of the present invention are usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0028] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set" and "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] After the hollow fabric is resin - compounded, a three - dimensional integral composite sandwich structure is formed. Compared with honeycomb materials and foam materials, the hollow composite material has the advantages of being not easy to delaminate, having strong designability, being fillable, pre - embeddable, etc., and good heat - preservation, heat - insulation and sound - insulation effects. At present, it has been widely used in the preparation of double - wall storage tanks. However, most of the hollow fabrics prepared on the market at present are flat - type hollow fabrics. When a cylindrical hollow fabric is needed, the flat - type hollow fabric is wrapped outside the core material, and then spliced at the joint to achieve the integrity of the material. This method is inefficient and has poor stability, greatly reducing the mechanical properties of the hollow composite material. Through surface layer reinforcement, the connection strength of the hollow composite material can be achieved to a certain extent. However, the connection strength of this scheme is poor, and it is also difficult to achieve batch production for seamless cutting of the fabric.

[0030] In order to overcome the above - mentioned defects, the present application proposes a cylindrical fabric with a hollow structure, which can avoid the stress concentration phenomenon caused by splicing of the fabric and the composite material, greatly improve the integrity of the material, and at the same time can be batch - produced, greatly improving the production efficiency, laying a foundation for the further application of the hollow fabric in the field of composite materials.

[0031] Figure 1 For a cross - sectional structure schematic diagram of the cylindrical fabric with a hollow structure provided by a specific embodiment of the present invention, please refer to Figure 1。

[0032] The tubular fabric with a hollow structure includes an upper fabric 110 and a lower fabric 130. The upper fabric 110 and the lower fabric 130 are connected to each other to form a tubular shape. The upper fabric 110 and the lower fabric 130 respectively include binding warp yarns, at least one upper panel and at least one lower panel. The binding warp yarns pass through both the upper panel and the lower panel, connecting the upper panel and the lower panel together, and a hollow structure is formed between the upper panel and the lower panel.

[0033] It should be noted that the upper panel and the lower panel can also be connected by binding weft yarns. The binding weft yarns pass through both the upper panel and the lower panel, connecting the upper panel and the lower panel together.

[0034] Specifically, in this embodiment, the upper fabric 110 includes a first binding warp yarn 115, at least one first upper panel 111 and at least one first lower panel 113. The first binding warp yarn 115 passes through both the first upper panel 111 and the first lower panel 113, connecting the first upper panel 111 and the first lower panel 113 together, and a hollow structure is formed between the first upper panel 111 and the first lower panel 113.

[0035] The lower fabric 130 includes a second binding warp yarn 135, at least one second upper panel 131 and at least one second lower panel 133. The second binding warp yarn 135 passes through both the second upper panel 131 and the second lower panel 133, connecting the second upper panel 131 and the second lower panel 133 together, and a hollow structure is formed between the second upper panel 131 and the second lower panel 133.

[0036] Each first upper panel 111 includes first upper warp yarns 116 and first upper weft yarns 117, and the first upper warp yarns 116 and the first upper weft yarns 117 are interwoven. The first lower panel 113 includes first lower warp yarns 119 and first lower weft yarns 118, and the first lower warp yarns 119 and the first lower weft yarns 118 are interwoven.

[0037] Each second upper panel 131 includes second upper warp yarns and second upper weft yarns, and the second upper warp yarns and the second upper weft yarns are interwoven; the second lower panel 133 includes second lower warp yarns and second lower weft yarns, and the second lower warp yarns and the second lower weft yarns are interwoven.

[0038] The "first", "second", etc. in this article are only used for distinction in description and have no special meaning. For example, the structures of the first upper panel 111 and the second upper panel 131 are the same, and they can both be called upper panels. By analogy, this will not be elaborated one by one here.

[0039] The first upper layer panel 111, the second upper layer panel 131, the first lower layer panel 113 and the second lower layer panel 133 all adopt double beam let-off. The first upper layer warp yarn 116, the second upper layer warp yarn, the first lower layer warp yarn 119 and the second lower layer warp yarn all adopt constant tension let-off, and the first binding warp yarn 115 and the second binding warp yarn 135 both adopt fixed length let-off. The let-off amount of the first binding warp yarn 115 is respectively greater than that of the first upper layer warp yarn 116 and the first lower layer warp yarn 119, and the let-off amount of the second binding warp yarn 135 is respectively greater than that of the second upper layer warp yarn and the second lower layer warp yarn.

[0040] Optionally, the cross-section of the first binding warp yarn 115 is in the shape of X, V, 8 or I, and the cross-section of the second binding warp yarn 135 is in the shape of X, V, 8 or I. The upper layer fabric 110 and the lower layer fabric 130 respectively adopt one or several of glass fiber, carbon fiber, basalt fiber, quartz fiber, silicon carbide fiber, aramid fiber, ultra-high molecular weight polyethylene fiber, and can be manufactured singly or in combination, that is, the materials adopted by the upper layer fabric 110 and the lower layer fabric 130 can be the same or different.

[0041] In this embodiment, the end of the upper layer fabric 110 is connected to the end of the lower layer fabric 130, so that the upper layer fabric 110 and the lower layer fabric 130 are integrally formed, that is, to ensure the continuity and integrity of the fibers, so as to improve the mechanical properties of the fabric. The end is the Figure 1 regions indicated by a and b in, and is also called the edge yarn position. Specifically, there are various connection methods for integral forming. For example, the end of the upper layer fabric 110 and the end of the lower layer fabric 130 are connected by a multi-layer corner interlock structure.

[0042] When the multi-layer corner interlock structure connection method is adopted, the warp yarns of the upper layer fabric 110 and the warp yarns of the lower layer fabric 130 are interwoven to form a multi-layer corner interlock structure. This connection method is applicable to the case where the thickness of the hollow-structured tubular fabric is relatively large, that is, when the transition distance between the upper layer fabric 110 and the lower layer fabric 130 is relatively large, the multi-layer corner interlock structure can prevent the floating length between the upper layer fabric 110 and the lower layer fabric 130 from being too long. Of course, this connection method of the multi-layer corner interlock structure is also applicable to the case where the thickness of the hollow-structured tubular fabric is relatively small.

[0043] Since it is very easy to adjust the distance between the upper panel and the lower panel during the weaving process, that is, the hollow distance of the hollow structure, also known as the wall thickness of the fabric. Therefore, the wall thickness of the tubular fabric with a hollow structure is easy to adjust, facilitating the weaving of fabrics with various wall thickness specifications. Similarly, the transition distance between the upper fabric 110 and the lower fabric 130 is also easy to adjust and control. Therefore, the tubular size of the tubular fabric with a hollow structure is also convenient to adjust, and fabrics of any size can be woven. For example, when the tubular fabric with a hollow structure is a cylindrical shape, both the diameter and the thickness of the cylinder can be determined according to actual needs to meet the requirements of different size specifications.

[0044] Optionally, the upper panel and the lower panel can be any one of plain weave, twill weave and their variant weaves. The thickness of the upper fabric 110 and the lower fabric 130 can be equal or unequal, and the number of layers of the upper fabric 110 and the lower fabric 130 can be single layer, or two layers or more. Moreover, in the upper fabric 110, the number of layers of the upper panel and the lower panel can be equal or unequal; in the lower fabric 130, the number of layers of the upper panel and the lower panel can be equal or unequal. In this embodiment, a first hollow distance is formed between the first upper panel 111 and the first lower panel 113, that is, the thickness of the upper fabric 110, and the first hollow distance is preferably 3 mm to 20 mm. A second hollow distance is formed between the second upper panel 131 and the second lower panel 133, that is, the thickness of the lower fabric 130, and the second hollow distance is preferably 3 mm to 20 mm. When the tubular fabric with a hollow structure is a cylindrical shape, the diameter of the cylinder is preferably 6 mm to 200 mm. Of course, it is not limited to this, the actual size of the fabric can be flexibly designed, and the cross-section of the tubular fabric with a hollow structure can be circular, or any other shape such as square, triangular, diamond-shaped, oval, polygonal, etc., which is not specifically limited here.

[0045] The weaving principle of the tubular fabric with a hollow structure provided by the present invention is as follows:

[0046] In order to prevent the direct transition from the upper fabric 110 to the lower fabric 130 from causing too long floating length and poor integrity of the fabric. In this embodiment, a multi-layer angular interlock structure is adopted at the edge yarn positions (the areas indicated by a and b in the figure), and warp yarns are used for knotting to knot the upper fabric 110 and the lower fabric 130 together to ensure the continuity and integrity of the fiber materials in the fabric.

[0047] Specifically, as Figure 2As shown, at the starting part, i.e., the edge yarn position a, the warp yarns 11, 12, 13, 14, 15, 16 in the upper fabric 110 are lifted upward, and the warp yarns 17, 18, 19, 20, 21, 22 in the lower fabric 130 sink downward, and the weft yarns 23 are introduced into the interlaced part of the warp yarns lifted upward and the warp yarns sunk downward, forming an angle interlocking structure. At the middle position c, the warp yarns 11, 12, 13, 14, 15, 16 lifted upward constitute the upper fabric 110 of the cylindrical fabric, wherein the warp yarns 11 and 13 constitute the upper panel of the upper fabric 110, the warp yarns 12 and 14 constitute the lower panel of the upper fabric 110, and the warp yarns 15 and 16 are used as the binding warp yarns to connect the upper panel with the lower panel, so that the upper fabric 110 is a hollow fabric structure. The downward warp yarns 17, 18, 19, 20, 21, and 22 constitute the lower fabric 130 of the cylindrical fabric, wherein the warp yarns 17 and 19 constitute the upper panel of the lower fabric 130, the warp yarns 18 and 20 constitute the lower panel of the lower fabric 130, and the warp yarns 21 and 22 are used as the binding warp yarns to connect the upper panel with the lower panel, so that the lower fabric 130 is a hollow structure. At the end, i.e., the edge yarn position b, the angle interlocking structure is still formed according to the initial part. Since the upper fabric 110 and the lower fabric 130 share the same set of warp yarns, they are cylindrical fabrics after being stretched out.

[0048] In summary, the hollow tubular fabric provided by the present invention has the following beneficial effects:

[0049] The hollow-structured cylindrical fabric provided by the present invention comprises an upper fabric 110 and a lower fabric 130, and is cylindrical in shape after being stretched out. The upper fabric 110 and the lower fabric 130 are both hollow structures at the middle position, and at the position of the side yarns, the warp yarns are mutually connected to connect the upper fabric 110 and the lower fabric 130 to form a whole. The wall thickness and overall size of the hollow-structured cylindrical fabric are adjustable. Preferably, the wall thickness ranges from 3 mm to 20 mm, and the diameter ranges from 6 mm to 200 mm. The upper fabric 110 and the lower fabric 130 can be designed as a single layer or multiple layers, and different thicknesses can be achieved to meet the use requirements of different components.

[0050] Through the fabric structure design, the upper and lower panels are effectively connected to form an integrated cylindrical multi-layer fabric. The wall thickness and diameter of the fabric can be adjusted according to the material application, eliminating the cutting and splicing steps, saving raw materials, ensuring that the fibers remain continuous and intact in the component, and improving the mechanical properties of the material. It can avoid the stress concentration caused by the splicing of fabrics and composite materials, greatly improve the integrity of the material, and can be mass-produced, greatly improving production efficiency, laying the foundation for the further application of hollow fabrics in the field of composite materials.

[0051] In addition, the composite material prepared using this fabric has the structural feature of precise profiling. On the one hand, it can meet the high specific strength and high specific stiffness requirements for load-bearing, and on the other hand, it can achieve multi-functional requirements such as heat insulation, energy absorption, noise reduction, and detection for the same structure. Moreover, the composite material made of the fabric reinforcement can be directly applied to the production of tubular fabrics with a hollow structure. The fibers have continuous integrity in the composite material, avoiding the decline in mechanical properties caused by fabric splicing, and it is an ideal method to achieve lightweight, high-strength, multi-functional, and integrated weaving and forming.

[0052] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes, combinations, and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A cylindrical fabric with a hollow structure, characterized in that, It includes an upper fabric and a lower fabric, and the upper fabric and the lower fabric are interconnected by a multi-layer corner interlock structure to form a tubular shape; The upper fabric includes first interlacing warp yarns, at least one first upper panel and at least one first lower panel. The first interlacing warp yarns pass through both the first upper panel and the first lower panel to connect the first upper panel and the first lower panel together, and a hollow structure is formed between the first upper panel and the first lower panel; The lower fabric includes second interlacing warp yarns, at least one second upper panel and at least one second lower panel. The second interlacing warp yarns pass through both the second upper panel and the second lower panel to connect the second upper panel and the second lower panel together, and a hollow structure is formed between the second upper panel and the second lower panel; Each first upper panel includes first upper warp yarns and first upper weft yarns, and the first upper warp yarns and the first upper weft yarns are interwoven; the first lower panel includes first lower warp yarns and first lower weft yarns, and the first lower warp yarns and the first lower weft yarns are interwoven; Each second upper panel includes second upper warp yarns and second upper weft yarns, and the second upper warp yarns and the second upper weft yarns are interwoven; the second lower panel includes second lower warp yarns and second lower weft yarns, and the second lower warp yarns and the second lower weft yarns are interwoven; The let-off amount of the first interlacing warp yarns is respectively greater than the let-off amounts of the first upper warp yarns and the first lower warp yarns, and the let-off amount of the second interlacing warp yarns is respectively greater than the let-off amounts of the second upper warp yarns and the second lower warp yarns. And the ends of the upper fabric and the lower fabric are connected by the multi-layer corner interlock structure, and the multi-layer corner interlock structure is formed by the interweaving of upper warp yarns and lower warp yarns.

2. The tubular fabric with a hollow structure according to claim 1, wherein The first upper panel, the second upper panel, the first lower panel and the second lower panel all adopt double beam let-off; the first upper warp yarns, the second upper warp yarns, the first lower warp yarns and the second lower warp yarns all adopt constant tension let-off, and the first interlacing warp yarns and the second interlacing warp yarns both adopt fixed length let-off; The let-off amount of the first interlacing warp yarns is respectively greater than the let-off amounts of the first upper warp yarns and the first lower warp yarns, and the let-off amount of the second interlacing warp yarns is respectively greater than the let-off amounts of the second upper warp yarns and the second lower warp yarns.

3. The tubular fabric with a hollow structure according to claim 1, characterized in that, The cross-section of the first interlacing warp yarns is in the shape of X, V, 8 or I, and the cross-section of the second interlacing warp yarns is in the shape of X, V, 8 or I.

4. The tubular fabric with a hollow structure according to claim 1, characterized in that, A first hollow distance is formed between the first upper panel and the first lower panel, and the first hollow distance is 3 mm to 20 mm; A second hollow distance is formed between the second upper panel and the second lower panel, and the second hollow distance is 3 mm to 20 mm.

5. The tubular fabric with a hollow structure according to claim 1, characterized in that, The upper fabric and the lower fabric are respectively made of one or several of glass fiber, carbon fiber, basalt fiber, quartz fiber, silicon carbide fiber, aramid fiber, ultra-high molecular weight polyethylene fiber.

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