Glass fiber fabric

Abstract

The utility model relates to the field of glass fiber products, in particular to a glass fiber fabric which comprises a warp yarn layer and a weft yarn layer. Wherein the warp yarn layer comprises warp yarns which are laid in parallel at a first density along the 0-degree direction; the weft yarn layer comprises weft yarns laid at a second density, and the weft yarn layer and the warp yarn layer are woven into the glass fiber fabric through knitting and sewing yarns; the ratio of the mass per unit area of the warp yarn layer to the mass per unit area of the weft yarn layer ranges from 80 to 99, and the ratio of the first density to the second density ranges from 0.6 to 0.9. By means of the design, it is guaranteed that the mass per unit area of the glass fiber fabric is concentrated in the 0-degree direction to the maximum extent, the mechanical property is greatly improved, and meanwhile the structural stability of the glass fiber fabric is improved.

Description

Technical Field

[0001] The present application relates to the field of glass fiber products, and in particular to a glass fiber fabric. Background Art

[0002] With the development and progress of wind power, wind turbine blades are gradually becoming larger. Wind turbine blades are made of glass fiber fabric impregnated with resin and then cured. As the main material for wind turbine blades, the requirements for its mechanical properties and structural stability are also increasing. However, the current mechanical properties of glass fiber fabric cannot meet the development needs of today's wind turbine blades. Utility Model Content

[0003] In order to solve the above technical problems, the present application provides a glass fiber fabric that improves mechanical properties while enhancing structural stability.

[0004] According to some embodiments, the present application provides a glass fiber fabric comprising:

[0005] a warp yarn layer, the warp yarn layer comprising warp yarns laid in parallel at a first density along a 0° direction;

[0006] a weft yarn layer, the weft yarn layer comprising weft yarns laid at a second density, the weft yarn layer and the warp yarn layer being woven into the glass fiber fabric through stitching yarns;

[0007] The ratio of the mass per unit area of ​​the warp yarn layer to the mass per unit area of ​​the weft yarn layer is in the range of 80-99, and the ratio of the first density to the second density is in the range of 0.6-0.9.

[0008] In some embodiments of the present application, the weft yarns include first weft yarns laid along a first direction and second weft yarns laid along a second direction, and the first direction is different from the second direction.

[0009] In some embodiments of the present application, the first direction and the second direction are opposite to each other, the first direction ranges from -89° to 0°, and the second direction ranges from 0° to +89°.

[0010] In some embodiments of the present application, the first density is 5-10 strands / inch, and the second density is 6-12 strands / inch.

[0011] In some embodiments of the present application, the braiding yarn adopts a double warp flat method to weave the weft yarn layer and the warp yarn layer into the glass fiber fabric.

[0012] In some embodiments of the present application, the tension of the warp yarn during the process of being introduced into the warp yarn layer is controlled by a warp yarn frame and a tension rod, and the tension range is 120 cN-200 cN.

[0013] In some embodiments of the present application, the mass per unit area of ​​the glass fiber fabric is in the range of 1700 g / m 2 -2000g / m 2 , wherein the mass per unit area of ​​the warp yarn is in the range of 1600 g / m 2 -1980g / m 2 .

[0014] In some embodiments of the present application, the linear density of the weft yarn is 50tex-70tex.

[0015] In some embodiments of the present application, the tensile strength of the glass fiber fabric is greater than or equal to 1550 MPa, and the compressive strength is greater than or equal to 950 MPa;

[0016] The tensile modulus of the glass fiber fabric is greater than or equal to 56 GPa, and the compression modulus is greater than or equal to 55 GPa.

[0017] In some embodiments of the present application, the warp yarn is a glass fiber yarn of E8DR17-2400-338 or E8DR24-4800-338; the braiding yarn is a polyester yarn, and the unit area mass of the braiding yarn is less than or equal to 13g / m 2 .

[0018] The glass fiber fabric provided by the present application can achieve the following beneficial technical effects:

[0019] The glass fiber fabric provided by the present application, by setting the ratio of the unit area mass of the warp yarn layer to the weft yarn layer in the range of 80-99, and setting the ratio of the laying density of the warp yarn and the weft yarn in the range of 0.6-0.9, ensures that the unit area mass of the glass fiber fabric is concentrated in the 0° direction to the greatest extent, greatly improves the mechanical properties, and also improves the structural stability of the glass fiber fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings herein are incorporated into the specification and constitute a part of the specification to illustrate embodiments of the present application and are used together with the description to explain the principles of the present application. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present application, rather than all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of a glass fiber fabric shown in an embodiment of the present application.

[0022] Reference numerals:

[0023] 100, warp yarn layer; 110, warp yarn;

[0024] 200, weft yarn layer; 210, weft yarn; 211, first weft yarn; 212, second weft yarn;

[0025] 300. Braiding yarn. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily.

[0027] Glass fiber is an inorganic non-metallic material with excellent performance. It is made of six kinds of minerals, namely pyrophyllite, quartz sand, limestone, dolomite, colemanite and magnesia borax, through high-temperature melting, wire drawing, winding and weaving. The diameter of its single filament is from several microns to more than 20 microns, which is equivalent to one twentieth to one fifth of a hair. Glass fiber fabric is woven from glass fiber and has the advantages of good insulation, strong heat resistance, good corrosion resistance and high mechanical strength. Therefore, it is widely used in the field of wind power generation and is often used as the main material of wind turbine blades.

[0028] In order to further improve the mechanical properties and structural stability of glass fiber fabrics, an embodiment of the present application provides a glass fiber fabric, by setting the ratio of the unit area mass of the warp yarn layer to the weft yarn layer to be in the range of 80-99, and setting the ratio of the laying density of the warp yarn and the weft yarn to be in the range of 0.6-0.9; since the glass fiber fabric is subjected to a greater tensile force in the 0° direction, the mechanical requirements in this direction are higher, which ensures that the unit area mass of the glass fiber fabric is concentrated in the 0° direction to the greatest extent, greatly improves the mechanical properties, and also improves the structural stability and infiltration speed of the glass fiber fabric.

[0029] The glass fiber fabric provided according to the present application is described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1 The x-axis direction shown in is the 0° direction.

[0031] An exemplary embodiment of the present application provides a glass fiber fabric, such as Figure 1As shown, the glass fiber fabric includes a warp yarn layer 100 and a weft yarn layer 200. The warp yarn layer 100 is composed of warp yarns 110 extending along the x-axis direction, and multiple warp yarns 110 are laid in parallel with a first density; the weft yarn layer 200 is composed of weft yarns 210 laid with a second density. The warp yarn layer 100 and the weft yarn layer 200 are woven into one by a stitching yarn 300 to form a glass fiber fabric.

[0032] In the glass fiber fabric of this embodiment, the ratio of the mass per unit area of ​​the warp yarn layer 100 to the weft yarn layer 200 is in the range of 80-99. The mass per unit area is the "gram weight" commonly used in textile products, that is, the weight of fabric per square meter, and the unit is "gram / square meter" (g / m 2 ). The ratio of the first density to the second density ranges from 0.6 to 0.9. The first density is the number of warp yarns 110 laid per inch. Similarly, the second density is the number of weft yarns 210 laid per inch. The unit is "roots / inch".

[0033] By setting the above parameters in this embodiment, the mass per unit area of ​​the warp yarn layer 100 is much greater than the mass per unit area of ​​the weft yarn layer 200, and the laying density of the weft yarn 210 in the weft yarn layer 200 is greater than the laying density of the warp yarn 110 in the warp yarn layer 100. By limiting the above two numerical ranges, more grid structures can be formed while ensuring that the mass per unit area of ​​the glass fiber fabric is concentrated in the 0° direction to the greatest extent and greatly improving the mechanical properties, thereby improving the structural stability of the glass fiber fabric. In addition, the glass fiber fabric only needs two yarn layers to achieve the target mechanical properties, simplifying the process.

[0034] The weaving method of the braiding yarn 300 can be, for example, weaving the warp yarn layer 100 and the weft yarn layer 200 together, heating and melting the braiding yarn 300, and then solidifying it to adhere the warp yarn layer 100 and the weft yarn layer 200 together. It can also be other weaving methods, which are not limited here.

[0035] It should be noted that the weft yarns 210 in this embodiment can extend in a 90° direction and be laid in parallel, or can be laid in parallel at other angles, as long as they are not parallel to the warp yarns 110 and can form a grid structure with the warp yarns 110 .

[0036] In some embodiments, Figure 1 As shown, the weft yarn 210 may include a first weft yarn 211 and a second weft yarn 212 that are laid crosswise, wherein the first weft yarn 211 is laid along a first direction, and the second weft yarn 212 is laid along a second direction. The crosswise laid first weft yarn 211 and second weft yarn 212 may further increase the grid structure, improve the structural strength of the weft yarn layer 200, and thereby increase the structural strength of the glass fiber fabric.

[0037] In some embodiments, the first direction and the second direction are opposite to each other, the first direction of the first weft yarn 211 is -89° to 0°, and the second direction of the second weft yarn 212 is 0° to +89°. For example, the first weft yarn 211 is laid in the -60° direction, and the second weft yarn 212 is laid in the +60° direction; for another example, the first weft yarn 211 is laid in the -35° direction, and the second weft yarn 212 is laid in the +35° direction.

[0038] In some embodiments, continue to refer to Figure 1 Under the premise of ensuring that the second density is greater than the first density, the first density range of the warp yarn layer 100 is 5-10 strands / inch, and the second density range of the weft yarn layer 200 is 6-12 strands / inch. Since the unit mass area of ​​the weft yarn layer 200 is much smaller than the unit mass area of ​​the warp yarn layer 100, setting the laying density of the weft yarn layer 200 within the above range can increase the grid structure when the weight is concentrated in the 0° direction, thereby increasing the structural stability of the glass fiber fabric.

[0039] In some embodiments, the stitching yarn 300 is woven into the warp yarn layer 100 and the weft yarn layer 200 using a double warp flat method, which forms a dense and firm structure between the warp yarn layer 100 and the weft yarn layer 200, so as to make the overall structure of the glass fiber fabric more stable.

[0040] In some embodiments, the yarn needs to be kept at a certain tension when it is introduced into the yarn layer. The warp yarn frame cooperates with the tension rod to introduce the warp yarn 110 into the warp yarn layer 100, and the tension range is 120cN-200cN. "cN" in this embodiment is the mechanical unit "centinewton", 1 centinewton = 0.01 Newton. The warp yarn 110 under this tension can obtain a warp yarn layer 100 with higher structural strength.

[0041] In some embodiments, the mass per unit area of ​​the glass fiber fabric is in the range of 1700 g / m 2 -2000g / m 2 , wherein the mass per unit area of ​​the warp yarn 110 is in the range of 1600 g / m 2 -1980g / m 2 This design reduces the gram weight in the 90° direction, so that the gram weight of the glass fiber fabric is concentrated to the 0° direction to the greatest extent, further improving the performance of the glass fiber fabric.

[0042] In some embodiments, the linear density of the weft yarn 210 is 50tex-70tex, for example, 68tex. The linear density refers to the mass per unit length of fiber, single yarn, mesh wire, etc., and is an indicator that describes the thickness of the yarn.

[0043] In some embodiments, the mechanical properties of the manufactured glass fiber fabric are as follows: tensile strength is greater than or equal to 1550 MPa, compression strength is greater than or equal to 950 MPa, tensile modulus is greater than or equal to 56 GPa, compression modulus is greater than or equal to 55 GPa, shear strength is greater than or equal to 54.5 MPa, and shear modulus is greater than or equal to 3.89 MPa. Compared with existing glass fiber fabrics, the performance is improved.

[0044] In some embodiments, the warp yarn 110 is made of glass fiber yarn with a specification of E8DR17-2400-338 or E8DR24-4800-338, and the weft yarn 210 is made of glass fiber yarn with a specification of EC9-68*766.

[0045] In other embodiments, the first weft yarn 211 and the second weft yarn 212 are made of different materials, for example, the first weft yarn 211 is made of glass fiber, and the second weft yarn 212 is made of carbon fiber; carbon fiber has the advantages of high temperature resistance, friction resistance, heat conduction and corrosion resistance, and because its graphite microcrystalline structure is preferentially oriented along the fiber axis, the carbon fiber has high strength and modulus along the fiber axis. With such a design, the weft yarn layer 200 woven from the first weft yarn 211 and the second weft yarn 212 can combine the advantages of the two materials, which is more conducive to strengthening the structural stability of the glass fiber fabric.

[0046] The braiding yarn 300 can be made of low-elastic polyester yarn with a specification of (75-100)D. The density of the braiding yarn 300 is 7ends / inch, the stitch length is 5mm, and the unit area mass is no more than 13g / m 2 , the roll length does not exceed 300m. Low-elastic polyester yarn has higher breaking strength, higher elastic modulus, excellent heat setting, better resilience, stronger heat resistance, stronger light resistance, and stronger corrosion resistance, which increases the structural stability of glass fiber fabrics.

[0047] In some embodiments, the glass fiber fabric may be composed of three yarn layers, which are warp yarn layer 100, weft yarn layer 200, and warp yarn layer 100 in sequence, that is, weft yarn layer 200 is located between two warp yarn layers 100, and the three yarn layers are woven together by stitching yarn 300 to form a glass fiber fabric. Among them, the warp yarn 110 extends along the x-axis direction, and multiple warp yarns 110 are laid in parallel at a first density; the weft yarn layer 200 is composed of weft yarns 210 laid at a second density, and the second density is greater than the first density. Such a design further increases the gram weight proportion of the warp yarn layer 100 in the glass fiber fabric, so that the unit area mass of the glass fiber fabric is concentrated in the 0° direction to the greatest extent.

[0048] The glass fiber fabric provided by the present application ensures that the mass per unit area of ​​the glass fiber fabric is concentrated in the 0° direction to the greatest extent, greatly improving the mechanical properties, and also increases the grid structure composed of the warp yarn 110 and the weft yarn 210, thereby improving the structural stability and infiltration speed of the glass fiber fabric, and can be applied to wind turbine blades greater than or equal to 90 meters in length. The glass fiber fabric provided by the present application is used to manufacture wind turbine blades, which can reduce the number of ply layers of the wind turbine blades while improving the mechanical properties and structural stability of the wind turbine blades, meeting the demand for the development of wind turbine blades towards large-scale development.

[0049] The contents described above may be implemented individually or in combination in various ways, and these variations are all within the protection scope of this application.

[0050] It should be noted that, in the description of the present application, the terms "upper", "lower", "front", "back", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, without contradiction.

[0055] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A glass fiber fabric, characterized in that: include: a warp yarn layer, the warp yarn layer comprising warp yarns laid in parallel at a first density along a 0° direction; a weft yarn layer, the weft yarn layer comprising weft yarns laid at a second density, the weft yarn layer and the warp yarn layer being woven into the glass fiber fabric through stitching yarns; Wherein, the ratio of the unit area mass of the warp yarn layer to the unit area mass of the weft yarn layer is in the range of 80-99, and the ratio of the first density to the second density is in the range of 0.6-0.9; The weft yarns include first weft yarns and second weft yarns that are cross-laid, the first weft yarns are glass fibers, and the second weft yarns are carbon fibers.

2. The glass fiber fabric according to claim 1, characterized in that: The weft yarns include first weft yarns laid along a first direction and second weft yarns laid along a second direction, the first direction being different from the second direction.

3. The glass fiber fabric according to claim 2, characterized in that: The first direction and the second direction are opposite to each other, the first direction ranges from -89° to 0°, and the second direction ranges from 0° to +89°.

4. The glass fiber fabric according to claim 1, characterized in that: The first density is 5-10 strands / inch, and the second density is 6-12 strands / inch.

5. The glass fiber fabric according to claim 1, characterized in that: The braiding yarn adopts a double warp flat method to weave the weft yarn layer and the warp yarn layer into the glass fiber fabric.

6. The glass fiber fabric according to claim 1, characterized in that: The tension of the warp yarn during the process of being introduced into the warp yarn layer is controlled by a warp yarn frame and a tension rod, and the tension range is 120 cN-200 cN.

7. The glass fiber fabric according to claim 1, characterized in that: The mass per unit area of ​​the glass fiber fabric is in the range of 1700 g / m 2 -2000g / m 2 , wherein the mass per unit area of ​​the warp yarn is in the range of 1600 g / m 2 -1980g / m 2 .

8. The glass fiber fabric according to claim 1, characterized in that: The linear density of the weft yarn is 50tex-70tex.

9. The glass fiber fabric according to claim 1, characterized in that: The tensile strength of the glass fiber fabric is greater than or equal to 1550 MPa, and the compressive strength is greater than or equal to 950 MPa; The tensile modulus of the glass fiber fabric is greater than or equal to 56 GPa, and the compression modulus is greater than or equal to 55 GPa.

10. The glass fiber fabric according to claim 1, characterized in that: The warp yarn is glass fiber yarn of E8DR17-2400-338 or E8DR24-4800-338; the braiding yarn is polyester yarn, and the unit area mass of the braiding yarn is less than or equal to 13g / m 2 .

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