A glass fiber composite felt and preparation method thereof

Abstract

The present invention discloses a glass fiber composite felt and a preparation method thereof, wherein the glass fiber composite felt comprises: a first unidirectional cloth, a second unidirectional cloth, a chopped fiber layer and a first binding yarn; the first unidirectional cloth is laid on the second unidirectional cloth, and the chopped fiber layer is laid on the first unidirectional cloth; the first binding yarn sews the first unidirectional cloth, the second unidirectional cloth and the chopped fiber layer together to form a first guide channel between the first unidirectional cloth and the second unidirectional cloth; the first unidirectional cloth is laid at a first predetermined angle; the second unidirectional cloth is laid at a second predetermined angle; the first unidirectional cloth and the second unidirectional cloth are crossed and sewed together through the first binding yarn at a predetermined angle. The fabric space thickness is increased, the resin space flow channel is increased, the uniformity of the gaps between the fabric yarns is improved, and the straightness and structural stability of the weft yarns are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of glass fiber products, and in particular to a glass fiber composite felt with fast resin impregnation speed and a preparation method thereof. Background Art

[0002] As the global wind power market shifts to wind energy development at low wind speeds and offshore wind farms, blades continue to grow; in general, in the future, both offshore and onshore wind power will inevitably develop in the direction of large blades and lightweight. However, the large-scale blades also bring many challenges: (1) increased mass; (2) manufacturing and reliability; (3) material cost; (4) transportation; (5) aeroelastic stability (flutter); (6) buckling; (7) fatigue load caused by gravity; (8) application in offshore wind conditions.

[0003] Among them, the most prominent problem facing the development of offshore wind farms is the speed of resin infusion during the manufacturing process. The resin takes about 3 hours to solidify. As the blades become larger and larger, the time required for blade infusion becomes longer and longer. Once the resin flow rate is not fast enough, the glass fiber is not fully impregnated or not completely soaked in the resin, which will cause the entire blade to be scrapped. However, the existing glass fiber is difficult to meet the requirements of the large-scale development of blades for the resin infusion speed, which greatly restricts the development of offshore wind farms. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a glass fiber composite felt, which increases the spatial thickness of the fabric and the resin space flow channel by adopting a secondary molding weaving process. The horizontal resin infusion speed is 2 times faster than that of the once-molded fabric of the same specification.

[0005] According to one aspect of the present invention, a glass fiber composite felt is provided, comprising: a first unidirectional cloth, a second unidirectional cloth, a chopped fiber layer and a first binding yarn; the first unidirectional cloth is weft-laid on the second unidirectional cloth, and the chopped fiber layer is laid on the first unidirectional cloth; the first binding yarn sews the first unidirectional cloth, the second unidirectional cloth and the chopped fiber layer together to form a first guide channel between the first unidirectional cloth and the second unidirectional cloth; the first unidirectional cloth is weft-laid at a first predetermined angle; the second unidirectional cloth is weft-laid at a second predetermined angle; the first unidirectional cloth and the second unidirectional cloth are crossed and sewed together by the first binding yarn at a predetermined angle.

[0006] Optionally, the first unidirectional cloth is formed by weaving the first warp yarn and the first weft yarn through the second binding yarn to form a second guide grid between the first warp yarn and the first weft yarn, the first warp yarn is laid in parallel at a first predetermined angle, and the first weft yarn is laid in parallel in a direction perpendicular to the first warp yarn; the second unidirectional cloth is formed by weaving the second warp yarn and the second weft yarn through the third binding yarn to form a third guide grid between the second warp yarn and the second weft yarn, the second warp yarn is laid in parallel at a second predetermined angle, and the second weft yarn is laid in parallel in a direction perpendicular to the second warp yarn.

[0007] Optionally, the first unidirectional cloth and the second unidirectional cloth are cross-arranged at 90-120°; the second guide grid and the third guide grid are cross-arranged at 90-120°.

[0008] Optionally, the first unidirectional fabric is laid at +m° or -m°, 45≤m≤60; and the second unidirectional fabric is laid at +n° or -n°, 45≤n≤60.

[0009] Optionally, the first unidirectional fabric is laid at ±45° or ±60°; and the second unidirectional fabric is laid at ±45° or ±60°.

[0010] Optionally, the chopped fiber layer is formed by randomly laid chopped glass fibers, and the length of the chopped glass fibers is 5 to 7 cm.

[0011] According to another aspect of the present invention, a method for preparing a glass fiber composite felt is provided, comprising the following steps: S1 feeding a first unidirectional cloth into a sewing device at a first predetermined angle, and simultaneously feeding a second unidirectional cloth into the sewing device at a first predetermined angle, and laying the first unidirectional cloth on the second unidirectional cloth; S2 cutting the glass fibers into chopped glass fibers with a length of 5 to 7 cm, and spreading the chopped glass fibers on the first unidirectional cloth to form a chopped fiber layer; S3 sewing the first unidirectional cloth, the second unidirectional cloth and the chopped fiber layer together with a first binding yarn.

[0012] Optionally, the method further includes the steps of weaving the first unidirectional fabric: (101) introducing the first warp yarn into a loom, and determining the density of the first warp yarn according to the mass per unit area of ​​the first unidirectional fabric; (102) arranging the first warp yarn in parallel along the 0° direction at a predetermined density; (103) introducing the first weft yarn into a loom, and determining the density of the first weft yarn according to the mass per unit area of ​​the first unidirectional fabric, and arranging the first weft yarn in parallel at a predetermined density; (104) sewing the first warp yarn and the first weft yarn into a unidirectional fabric by using a second binding.

[0013] Optionally, the method further includes the steps of weaving a second unidirectional fabric: (201) introducing the second warp yarn into a loom, and determining the density of the first warp yarn according to the mass per unit area of ​​the second unidirectional fabric; (202) arranging the second warp yarn in parallel along the 0° direction at a predetermined density; (203) introducing the second weft yarn into a loom, and determining the density of the second weft yarn according to the mass per unit area of ​​the second unidirectional fabric, and arranging the second weft yarn in parallel at a predetermined density; (204) sewing the second warp yarn and the second weft yarn into a second unidirectional fabric by using a third binding.

[0014] The glass fiber composite felt provided in this application is woven through a secondary molding weaving process, which increases the spatial thickness of the fabric and the spatial flow channel of the resin. The use of unidirectional cloth oblique laying and two-time sewing process not only improves the uniformity of the gaps between the fabric yarns, but also ensures the straightness and structural stability of the weft yarns. The horizontal resin infusion speed of the glass fiber composite felt in this application is 2 times faster than that of the same specification one-time molding fabric, which greatly improves the blade manufacturing efficiency and reduces the risk of large blade infusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 is a schematic diagram of the structure of the glass fiber composite felt in the embodiment;

[0017] Figure 2 is a side view of the glass fiber composite mat in the embodiment;

[0018] Figure 3 Schematic diagram of unidirectional fabric in a specific embodiment. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the feature vectors in the embodiments can be arbitrarily combined with each other.

[0020] As the global wind power market shifts to wind energy development at low wind speeds and offshore wind farms, blades continue to grow; in general, in the future, both offshore and onshore wind power will inevitably develop in the direction of large blades and lightweight. However, the large-scale blades also bring many challenges: (1) increased mass; (2) manufacturing and reliability; (3) material cost; (4) transportation; (5) aeroelastic stability (flutter); (6) buckling; (7) fatigue load caused by gravity; (8) application in offshore wind conditions.

[0021] Among them, the most prominent problem facing the development of offshore wind farms is the speed of resin infusion during the manufacturing process. The resin takes about 3 hours to solidify. As the blades become larger and larger, the time required for blade infusion becomes longer and longer. Once the resin flow rate is not fast enough, the glass fiber is not fully impregnated or not completely soaked in the resin, which will cause the entire blade to be scrapped. However, the existing glass fiber is difficult to meet the requirements of the large-scale development of blades for the resin infusion speed, which greatly restricts the development of offshore wind farms.

[0022] To this end, the present application provides a glass fiber composite felt that is woven through a secondary molding weaving process to increase the fabric space thickness and increase the resin space flow channel. The use of unidirectional cloth oblique laying and two-time sewing process not only improves the uniformity of the gaps between the fabric yarns, but also ensures the straightness and structural stability of the weft yarns. The horizontal resin infusion speed of the glass fiber composite felt of the present application is 2 times faster than that of the same specification one-time molding fabric, which greatly improves the blade manufacturing efficiency and reduces the risk of large blade infusion.

[0023] The glass fiber composite felt of the present application, such as Figure 1 , 2 As shown, it includes: a first unidirectional cloth 01, a second unidirectional cloth 02, a chopped fiber layer 03 and a first binding yarn 04; the first unidirectional cloth 01 is weft-laid on the second unidirectional cloth 02, and the chopped fiber layer 03 is laid on the first unidirectional cloth 01; the first binding yarn 04 sews the first unidirectional cloth 01, the second unidirectional cloth 02 and the chopped fiber layer 03 together to form a first guide channel 05 between the first unidirectional cloth 01 and the second unidirectional cloth 02; the first unidirectional cloth 01 is weft-laid at a first predetermined angle; the second unidirectional cloth 02 is weft-laid at a second predetermined angle; the first unidirectional cloth 01 and the second unidirectional cloth 02 are crossed at a predetermined angle and sewed together by the first binding yarn 04. The glass fiber composite felt of the present application is a double-layer structure, and the first unidirectional cloth 01 and the second unidirectional cloth 02 are woven and sewn into a three-dimensional structure. The gap between the first unidirectional cloth 01 and the second unidirectional cloth 02 forms a first guide channel 05. Compared with the existing unidirectional fabrics, when the glass fiber felt of the present application is infused with resin, the resin can accelerate the infusion speed of the first unidirectional cloth 01 and the second unidirectional cloth 02 through the first guide channel 05.

[0024] As an example, the first unidirectional fabric 01 is formed by sewing the first warp yarn and the first weft yarn through the second binding yarn to form a second guide grid 011 between the first warp yarn and the first weft yarn, the first warp yarn is laid in parallel at a first predetermined angle, and the first weft yarn is laid in parallel in a direction perpendicular to the first warp yarn.

[0025] The second unidirectional fabric 02 is formed by weaving the second warp yarn and the second weft yarn through the third binding yarn to form a third guide grid 022 between the second warp yarn and the second weft yarn, the second warp yarn is laid in parallel at a second predetermined angle, and the second weft yarn is laid in parallel in a direction perpendicular to the second warp yarn.

[0026] The first warp yarns and the first weft yarns of the first unidirectional fabric 01 form a second flow guiding grid 011. According to the arrangement density of the first warp yarns and the first weft yarns, the second flow guiding grid 011 is a uniform square grid or a rectangular grid.

[0027] The second warp yarns and the second weft yarns of the second unidirectional fabric 02 form a third flow guide grid 022. According to the arrangement density of the second warp yarns and the second weft yarns, the third flow guide grid 022 is a uniform square grid or a rectangular grid.

[0028] When the glass fiber fabric is infused with resin, the more the number of guide grids and the more uniform the shape of the guide grids, the faster the infusion speed. The present application includes a two-layer grid structure including a second guide grid 011 and a third guide grid 022. The guide grids are more than those of conventional glass fiber fabrics. A first guide channel 05 is also included between the first unidirectional cloth 01 and the second unidirectional cloth 02, forming a double-layer three-dimensional guide space structure, which helps to accelerate the speed of resin infusion.

[0029] As an example, the first unidirectional fabric 01 and the second unidirectional fabric 02 are arranged at 90-120 degrees, and the second guide grid 011 and the third guide grid 022 are arranged at 90-120 degrees, for example, 95 degrees, 100 degrees, 105 degrees, 110 degrees, and 115 degrees.

[0030] Based on the above examples, in a feasible implementation manner, the unidirectional fabric in the glass fiber composite mat of the present application is as follows: Figure 3 As shown, the warp yarns 001 and the weft yarns 002 are cross-bound to form a square or quasi-square flow guide grid 003 .

[0031] Based on the above examples, in another feasible implementation manner, the unidirectional fabric in the glass fiber composite felt of the present application may be a unidirectional base fabric obtained by bundling 90° weft yarns, and the unidirectional base fabric does not include 0° warp yarns and a guide grid.

[0032] As an example, the first unidirectional fabric 01 is laid with parallel weft at +m° or -m°, 45≤m≤60; the second unidirectional fabric 02 is laid with parallel weft at +n° or -n°, 45≤n≤60.

[0033] As an example, the first warp yarns of the first unidirectional fabric 01 and the second warp yarns of the second unidirectional fabric 02 are crossed and sewn together at 90-120°; the first weft yarns of the first unidirectional fabric 01 and the second weft yarns of the second unidirectional fabric 02 are crossed at 90-120°.

[0034] As an example, the first unidirectional fabric 01 is laid at ±45° or ±60°; the second unidirectional fabric 02 is laid at ±45° or ±60°.

[0035] As an example, the first unidirectional cloth 01 and the second unidirectional cloth 02 of the present application are the same unidirectional cloth, the second guide grid 011 and the third guide grid 022 are the same in shape and size, and when pouring resin, the glass fiber felt is poured evenly and the pouring speed is faster.

[0036] As an example, the chopped fiber layer 03 is formed by randomly laid chopped glass fibers, and the length of the chopped glass fibers is 5 to 7 cm.

[0037] The preparation method of the glass fiber composite felt of the present application is as follows:

[0038] S1 feeds the first unidirectional fabric 01 into the stitching device at a first predetermined angle, and at the same time feeds the second unidirectional fabric 02 into the stitching device at the first predetermined angle, and lays the first unidirectional fabric 01 on the second unidirectional fabric 02.

[0039] S2: cutting the glass fibers into chopped glass fibers with a length of 5 to 7 cm, and spreading the chopped glass fibers on the first unidirectional fabric 01 to form a chopped fiber layer 03.

[0040] S3 uses the first binding yarn 04 to sew the first unidirectional fabric 01, the second unidirectional fabric 02 and the chopped fiber layer 03 together.

[0041] As an example, the method further includes the following steps of weaving the first unidirectional fabric 01: (101) introducing the first warp yarn into a loom, and determining the density of the first warp yarn according to the mass per unit area of ​​the first unidirectional fabric 01; (102) arranging the first warp yarn in parallel along the 0° direction at a predetermined density; (103) introducing the first weft yarn into a loom, and determining the density of the first weft yarn according to the mass per unit area of ​​the first unidirectional fabric 01, and arranging the first weft yarn in parallel at a predetermined density; (104) using the second binding yarn to sew the first warp yarn and the first weft yarn into the first unidirectional fabric 01.

[0042] As an example, the method further includes the following steps of weaving the second unidirectional fabric 02: (201) introducing the second warp yarn into a loom, and determining the density of the first warp yarn according to the mass per unit area of ​​the second unidirectional fabric 02; (202) arranging the second warp yarn in parallel along the 0° direction at a predetermined density; (203) introducing the second weft yarn into a loom, and determining the density of the second weft yarn according to the mass per unit area of ​​the second unidirectional fabric 02, and arranging the second weft yarn in parallel at a predetermined density; (204) using a third binding yarn to sew the second warp yarn and the second weft yarn into the second unidirectional fabric 02.

[0043] As an example, the first unidirectional fabric 01 and the second unidirectional fabric 02 in the present application are the same. Under this condition, the preparation method of the glass fiber composite felt of the present application is as follows:

[0044] The warp yarns are introduced into the hinge loom, and the density of the warp yarns is determined according to the unit area mass of the unidirectional fabric; the warp yarns are arranged in parallel at a predetermined density along the 0° direction; the weft yarns are introduced into the hinge loom, and the density of the weft yarns is determined according to the unit area mass of the unidirectional fabric, and the weft yarns are arranged in parallel at a predetermined density; the first warp yarn and the first weft yarn are sewed into the unidirectional fabric by using the unidirectional fabric binding yarn.

[0045] Place two rolls of unidirectional fabric at the rear of the stitching device, pull the upper roll to +45-60°, pull the lower roll to -45-60°, and use a cloth feeding rack to feed the two layers of unidirectional fabric into the stitching device respectively.

[0046] The glass fibers are cut into chopped glass fibers with a length of 5 to 7 cm, and the chopped glass fibers are spread on the first unidirectional fabric 01 to form a chopped fiber layer 03 .

[0047] The two layers of unidirectional fabric and the chopped fiber layer 03 are sewn together by the first binding yarn 04 to obtain a glass fiber mat.

[0048] The preparation method of the glass fiber composite felt provided by the present invention will be explained in detail below by way of specific examples.

[0049] Example 1

[0050] Glass fiber composite mat E-BIAX600 / M100-t (±60°), the total unit area mass (gram weight) of E-BIAX600 / M100-t (±60°) fabric is (778±5%) g / m 2. E-BIAX600 / M100-t (±60°) includes: a first unidirectional fabric, a second unidirectional fabric, a chopped fiber layer, and a first binding yarn; the first unidirectional fabric is laid on the second unidirectional fabric, and the chopped fiber layer is laid on the first unidirectional fabric; the first binding yarn sews the first unidirectional fabric, the second unidirectional fabric, and the chopped fiber layer together. The first unidirectional fabric is laid at +60°; the second unidirectional fabric is laid at -60°; the first unidirectional fabric and the second unidirectional fabric are crossed at a predetermined angle and sewed together through the first binding yarn.

[0051] The preparation method of glass fiber composite felt E-BIAX600 / M100-t (±60°) is as follows: First, a fiberglass composite felt with a unit area weight of (291±3%) g / m 2 T-type unidirectional fabric, 0° warp yarn uses EC9-68 yarn, one-through-one-through yarn method, yarn density 202ends / 10cm, unit area mass controlled at (27±3%)g / m 2 90° weft yarn uses E6DR17-1200 yarn, yarn density 22ends / 10cm, unit area mass controlled at (264±3%) g / m 2 , two yarns are twisted into T-shaped unidirectional fabric. Then the two layers of T-shaped unidirectional fabric are pulled online into ±60° behind the needle bed of the sewing device, and the yarn angle deviation is controlled at ±2°. The two layers of T-shaped unidirectional fabric are fed into the sewing area of ​​the needle bed of the sewing device using a cloth feeding frame. The unit area mass of the single-layer base fabric is controlled at (335±3%) g / m 2 . Use a short-cut device to cut the ER13-2400 short-cut yarn into short-cut glass fibers of 5-7 cm in length. Disperse the short-cut glass fibers evenly in each direction on the upper T-shaped unidirectional cloth to form a short-cut fiber layer. The unit area mass of the short-cut fiber layer is controlled at (100±10%) g / m 2 , use infrared online monitoring equipment to monitor abnormal conditions such as short-cut knives, sticky rollers, uneven dispersion, etc. 100D low-elastic polyester yarn is used as the first binding yarn. The first binding yarn is used to sew two layers of T-shaped unidirectional cloth and short-cut fiber layers together in a warp-plain manner. The stitch density is 3.5sti / inch, the stitch length is 4.0mm, and the unit area mass is (8.5±1)g / m 2 , the short cut is automatically rolled up inside.

[0052] Example 2

[0053] Glass fiber composite felt E-BX1200 / M100-t, the total unit area mass (gram weight) of E-BX1200 / M100-t fabric is (1324±5%) g / m 2. E-BX1200 / M100-t includes: a first unidirectional fabric, a second unidirectional fabric, a chopped fiber layer, and a first binding yarn; the first unidirectional fabric is laid on the second unidirectional fabric, and the chopped fiber layer is laid on the first unidirectional fabric; the first binding yarn sews the first unidirectional fabric, the second unidirectional fabric, and the chopped fiber layer together. The first unidirectional fabric is laid at +45°; the second unidirectional fabric is laid at -45°; the first unidirectional fabric and the second unidirectional fabric are crossed and sewed together by the first binding yarn at a predetermined angle.

[0054] The preparation method of E-BX1200 / M100-t is as follows: produce a unit area weight of (429±3%) g / m on the HS machine 2 2 T-type unidirectional fabric, 90° weft yarn is laid with E6DR17-2400 yarn HS, and the unit area mass is controlled at (425±3%) g / m 2 The polyester yarn used in the unidirectional fabric binding yarn is 100D low-elastic light mesh, chain stitching, density 3.0sti / inch, CPI 9.0sti / inch, unit area mass (4±1)g / m 2 Then the two layers of T-shaped unidirectional fabric are pulled online into ±45° behind the needle bed of the sewing device. The angle deviation of the yarn in the fabric is controlled at ±2°. The two layers of T-shaped unidirectional fabric are automatically fed into the sewing area of ​​the needle bed of the sewing device using a cloth feeding frame. The unit area mass of the single-layer base fabric is controlled at (609±3%) g / m 2 Use a short-cut device to cut the ER13-2400 short-cut yarn into 5-7cm long short-cuts and evenly spread them on the upper T-shaped unidirectional fabric to form a short-cut fiber layer. The unit area mass of the short-cut fiber layer is controlled at (100±10%) g / m 2 The infrared online monitoring equipment is used to monitor abnormal conditions such as short-cut knives, sticky rollers, uneven dispersion, etc. 100D low-elastic polyester yarn is used as the first binding yarn. The first binding yarn is used to sew two layers of T-shaped unidirectional cloth and short-cut fiber layers together in a warp-plain manner. The density is 7sti / inch, the stitch length is 4.0mm, and the unit area mass is (7±1)g / m 2 , the short cut is automatically rolled up inside.

[0055] Example 3

[0056] Glass fiber composite felt E-BX400 / M275-t, E-BX400 / M275-t total unit area mass (gram weight) is (725±5%) g / m 2. E-BX400 / M275-t includes: a first unidirectional fabric, a second unidirectional fabric, a chopped fiber layer, and a first binding yarn; the first unidirectional fabric is laid on the second unidirectional fabric, and the chopped fiber layer is laid on the first unidirectional fabric; the first binding yarn sews the first unidirectional fabric, the second unidirectional fabric, and the chopped fiber layer together. The first unidirectional fabric is laid at +45°; the second unidirectional fabric is laid at -45°; the first unidirectional fabric and the second unidirectional fabric are crossed at a predetermined angle and sewed together through the first binding yarn.

[0057] The preparation method of E-BX400 / M275-t is as follows: First, produce a unit area weight of 155±3% g / m on the HS machine. 2 T-type unidirectional fabric, 90° weft yarn is HS-laid with E6DR17-600 yarn, and the unit area quality is controlled at 151±3% g / m 2 The polyester yarn used in the unidirectional fabric binding yarn is 100D low-elastic light mesh, chain stitched, with a density of 3.0sti / inch, a CPI of 6.4sti / inch, and a unit area mass of (4±1)g / m 2 Then the two layers of T-shaped unidirectional fabric are pulled online into ±45° behind the needle bed of the sewing device, and the angle deviation of the yarn in the fabric is controlled at ±2°. The two layers of T-shaped unidirectional fabric are automatically fed into the sewing area of ​​the needle bed of the sewing device, and the unit area mass of the single-layer T-shaped unidirectional fabric is controlled at (219±3%) g / m 2 . Use a short-cut device to cut the ER13-2400 short-cut yarn into short-cut glass fibers of 5-7 cm in length. Spread the short-cut glass fibers evenly on the upper T-shaped unidirectional cloth to form a short-cut fiber layer. The unit area mass of the short-cut fiber layer is controlled at (275±10%) g / m 2 Infrared online monitoring equipment is used to monitor abnormal conditions such as short cut knives, sticky rollers, uneven dispersion, etc. The density of T-shaped unidirectional cloth is 7sti / inch, the stitch length is 2.82mm, and the unit area mass is (12±1)g / m 2 , the short cut is automatically rolled up inside.

[0058] Example 4

[0059] The total unit area mass (gram weight) of glass fiber composite felt E-BX600 / M275-t and E-BX600 / M275-t fabric is controlled at (893±5%) g / m 2. E-BX600 / M275-t includes: a first unidirectional fabric, a second unidirectional fabric, a chopped fiber layer, and a first binding yarn; the first unidirectional fabric is laid on the second unidirectional fabric, and the chopped fiber layer is laid on the first unidirectional fabric; the first binding yarn sews the first unidirectional fabric, the second unidirectional fabric, and the chopped fiber layer together. The first unidirectional fabric is laid at +45°; the second unidirectional fabric is laid at -45°; the first unidirectional fabric and the second unidirectional fabric are crossed at a predetermined angle and sewed together by the first binding yarn.

[0060] The preparation method of E-BX600 / M275-t is as follows: The unit weight per unit area is 213±3% g / m 2 T-type unidirectional fabric, 90° weft yarn is HS-laid with E6DR14-735 yarn, and the unit area quality is controlled at 209±3% g / m 2 The polyester yarn used in the binding line is 100D low-elastic light mesh, chain-woven, with a density of 3.0sti / inch, a CPI of 7.21sti / inch, and a unit area mass of (4±1)g / m 2 Then the two layers of T-shaped unidirectional fabric are pulled online to ±45° behind the needle bed of the sewing device. The angle deviation of the yarn in the fabric is controlled at ±2°. The base fabric is automatically fed into the sewing area of ​​the needle bed of the sewing device. The unit area mass of the single-layer unidirectional fabric is controlled at (303±3%) g / m 2 . Use a short-cut device to cut the ER13-2400 short-cut yarn into short-cut glass fibers of 5-7 cm in length. Spread the short-cut glass fibers evenly on the upper T-shaped unidirectional cloth to form a short-cut fiber layer. The unit area mass of the short-cut fiber layer is controlled at (275±10%) g / m 2 The infrared online monitoring equipment is used to monitor abnormal conditions such as short-cut knives, sticky rollers, uneven dispersion, etc. 100D low-elastic polyester yarn is used as the first binding yarn. Two layers of T-shaped unidirectional fabric and short-cut fiber layers are sewn together in a warp-plain manner. The stitch density is 7sti / inch, the stitch length is 2.82mm, and the unit area mass is (12±1)g / m 2 , the short cut is automatically rolled up inside.

[0061] Comparative test example

[0062] The performance of the glass fiber felts of Examples 1-4 was tested. At the same time, for the prior art (the conventional E-BX600M100 product is generally formed at one time on a multi-axial warp knitting device, and the two weft laying devices in the weft laying area are placed front and back at ±45° to the device, and the E6DR13-300 yarn is laid crosswise at +45° and -45° by the weft laying device. The chopped yarn of ER13-2400 is cut into 5-7cm long chopped glass fibers and evenly spread on the conveyor belt. The yarn and chopped fibers enter the needle bed together with the conveyor belt for stitching. 100D low-elastic polyester yarn is used as the first binding yarn, and the two layers of yarn and the chopped fiber layer are stitched together in a warp flat stitching manner. The stitching density is 7sti / inch, the stitch length is 3.4mm, and the unit area mass is (10±1)g / m 2 ) were compared with the performance data of glass fiber fabrics, as shown in Table 1.

[0063] Table 1 Performance test and comparison results

[0064]

[0065] Among them, the infusion speed test method used in Table 1 of this application is a vacuum horizontal penetration test, and the sample cloth size is 30*60cm; the static mechanical test adopts the 0° and 90° tensile test standard ISO527-4.

[0066] It can be seen from Table 1 that the fastest infusion speed of the glass fiber felt 30*60cm of the present application is only 8.3min, which is more than twice as fast as the infusion speed of the once-formed fabric of the same specification in the prior art; and the 0° tensile modulus and 90° tensile modulus (GPa) of the glass fiber felt of the present application are higher than the tensile modulus of the once-formed fabric of the same specification.

[0067] It should be noted that, in this article, the term "includes", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of more restrictions, the elements defined by the sentence "comprising..." do not exclude the existence of other identical elements in the article or device including the elements.

[0068] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. The present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A glass fiber composite mat, characterized in that: include: A first unidirectional fabric (01), a second unidirectional fabric (02), a chopped fiber layer (03) and a first binding yarn (04); the first unidirectional fabric (01) is weft-laid on the second unidirectional fabric (02), and the chopped fiber layer (03) is laid on the first unidirectional fabric (01); the first binding yarn (04) sews the first unidirectional fabric (01), the second unidirectional fabric (02) and the chopped fiber layer (03) together, so that a first guide channel (05) is formed between the first unidirectional fabric (01) and the second unidirectional fabric (02); The first unidirectional fabric (01) is weft-laid at a first predetermined angle; the second unidirectional fabric (02) is weft-laid at a second predetermined angle; the first unidirectional fabric (01) and the second unidirectional fabric (02) are crossed at a predetermined angle and sewn together through the first binding yarn (04); The first unidirectional fabric (01) and the second unidirectional fabric (02) are the same unidirectional fabric.

2. The glass fiber composite mat according to claim 1, characterized in that: The first unidirectional fabric (01) is formed by sewing first warp yarns and first weft yarns through second binding yarns, so that a second flow guide grid (011) is formed between the first warp yarns and the first weft yarns, the first warp yarns are laid in parallel at a first predetermined angle, and the first weft yarns are laid in parallel in a direction perpendicular to the first warp yarns; The second unidirectional fabric (02) is formed by weaving second warp yarns and second weft yarns through third binding yarns to form a third guide grid (022) between the second warp yarns and the second weft yarns, the second warp yarns are laid in parallel at a second predetermined angle, and the second weft yarns are laid in parallel in a direction perpendicular to the second warp yarns.

3. The glass fiber composite mat according to claim 2, characterized in that: The first unidirectional fabric (01) and the second unidirectional fabric (02) are cross-arranged at an angle of 90 to 120 degrees; the second flow guide grid (011) and the third flow guide grid (022) are cross-arranged at an angle of 90 to 120 degrees.

4. The glass fiber composite mat according to claim 3, characterized in that: The first unidirectional fabric (01) has a weft laying angle of +m° or -m°, 45≤m≤60; the second unidirectional fabric (02) has a weft laying angle of +n° or -n°, 45≤n≤60.

5. The glass fiber composite mat according to claim 4, characterized in that: The first unidirectional fabric (01) is laid at a weft angle of ±45° or ±60°; and the second unidirectional fabric (02) is laid at a weft angle of ±45° or ±60°.

6. The glass fiber composite mat according to claim 1, characterized in that: The chopped fiber layer (03) is formed by chopped glass fibers being laid out in an irregular manner, and the length of the chopped glass fibers is 5 to 7 cm.

7. A method for preparing a glass fiber composite felt, characterized in that: The following steps are involved: S1: feeding the first unidirectional fabric into a stitching device at a first predetermined angle, and feeding the second unidirectional fabric into the stitching device at the first predetermined angle, and laying the first unidirectional fabric on the second unidirectional fabric; S2: cutting the glass fibers into chopped glass fibers with a length of 5 to 7 cm, and spreading the chopped glass fibers on the first unidirectional fabric to form a chopped fiber layer; S3 uses the first binding yarn to sew the first unidirectional fabric, the second unidirectional fabric and the chopped fiber layer together.

8. The method for preparing the glass fiber composite mat according to claim 7, characterized in that: Also included is the weaving step of the first unidirectional fabric: (101) introducing the first warp yarn into the hinge loom, and determining the density of the first warp yarn according to the mass per unit area of ​​the first unidirectional fabric; (102) arranging the first warp yarns in parallel along the 0° direction according to a predetermined density; (103) introducing the first weft yarn into the hinge loom, determining the density of the first weft yarn according to the mass per unit area of ​​the first unidirectional fabric, and arranging the first weft yarn in parallel according to the predetermined density; (104) The first warp yarn and the first weft yarn are stitched together into a unidirectional fabric using a second binding.

9. The method for preparing the glass fiber composite mat according to claim 8, characterized in that: Also included is the weaving step of the second unidirectional fabric: (201) introducing the second warp yarn into the hinge loom, and determining the density of the first warp yarn according to the mass per unit area of ​​the second unidirectional fabric; (202) arranging the second warp yarns in parallel along the 0° direction according to a predetermined density; (203) introducing the second weft yarn into the hinge loom, determining the density of the second weft yarn according to the mass per unit area of ​​the second unidirectional fabric, and arranging the second weft yarn in parallel according to the predetermined density; (204) The second warp yarn and the second weft yarn are stitched together into a second unidirectional fabric by using a third binding.

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