CN111910335B - A glass fiber composite felt and preparation method thereof - Google Patents
A glass fiber composite felt and preparation method thereof Download PDFInfo
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- CN111910335B CN111910335B CN202010935213.9A CN202010935213A CN111910335B CN 111910335 B CN111910335 B CN 111910335B CN 202010935213 A CN202010935213 A CN 202010935213A CN 111910335 B CN111910335 B CN 111910335B
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
- D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2101/00—Inorganic fibres
- D10B2101/02—Inorganic fibres based on oxides or oxide ceramics, e.g. silicates
- D10B2101/06—Glass
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Abstract
本发明公开了一种玻璃纤维复合毡及其制备方法，其中，玻璃纤维复合毡包括：第一单向布、第二单向布、短切纤维层以及第一捆绑纱；第一单向布铺纬在第二单向布上，短切纤维层铺设在第一单向布上；第一捆绑纱将第一单向布、第二单向布和短切纤维层编缝在一起，以使第一单向布和第二单向布之间形成第一导流通道；第一单向布以第一预定角度铺纬；第二单向布以第二预定角度铺纬；第一单向布和第二单向布以预定角度交叉通过第一捆绑纱编缝在一起。增大了织物空间厚度，增加了树脂空间流道，既改善了织物纱线间缝隙均匀性，又保证了纬向纱线平直性和结构稳定性。
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
The invention relates to the technical field of glass fiber products, in particular to a glass fiber composite felt with high resin infiltration speed and a preparation method thereof.
Background
As the global wind power market turns to low wind speed and wind energy development of offshore wind farms, the blades are continuously increased, and in the future, the wind power is in the sea or on land, and the wind power is in the large-blade type and light-weight direction. However, blade enlargement also presents challenges of (1) mass increase, (2) manufacturing and reliability, (3) material cost, (4) transportation, (5) aeroelastic stability (flutter), (6) buckling, (7) fatigue loading due to gravity, and (8) offshore wind regime application.
The most outstanding problem faced by the development of offshore wind farms is the problem of resin infusion speed in the manufacturing process, the resin curing time is about 3 hours, as the blades become larger, the time required for blade infusion becomes longer and longer, and once the resin flow speed is insufficient, glass fibers are not fully infiltrated or are not fully saturated with the resin, so that the whole blade can be scrapped. However, the existing glass fibers are difficult to meet the requirement of the large-scale development of the blades on the resin infiltration speed, and the development of the offshore wind farm is greatly limited.
Disclosure of Invention
In order to solve the technical problems, the invention provides a glass fiber composite felt, which adopts a weaving process of secondary forming to improve the space thickness of a fabric, increase a resin space runner and ensure that the horizontal resin infusion speed is 2 times faster than that of a one-step forming fabric with the same specification.
According to one aspect of the present invention, there is provided a glass fiber composite mat including a first unidirectional cloth, a second unidirectional cloth, a chopped fiber layer, and a first binder yarn, the first unidirectional cloth laid over the second unidirectional cloth, the chopped fiber layer laid over the first unidirectional cloth, the first binder yarn stitch the first unidirectional cloth, the second unidirectional cloth, and the chopped fiber layer together to form a first flow guide channel between the first unidirectional cloth and the second unidirectional cloth, the first unidirectional cloth laid at a first predetermined angle, the second unidirectional cloth laid at a second predetermined angle, the first unidirectional cloth and the second unidirectional cloth stitch together at a predetermined angle cross-wise through the first binder yarn.
Alternatively, the first unidirectional cloth is stitched by a first warp yarn and a first weft yarn through a second binding yarn so as to form a second diversion grid between the first warp yarn and the first weft yarn, the first warp yarn is laid in parallel at a first preset angle, the first weft yarn is laid in parallel in a direction perpendicular to the first warp yarn, the second unidirectional cloth is stitched by a second warp yarn and a second weft yarn through a third binding yarn so as to form a third diversion grid between the second warp yarn and the second weft yarn, the second warp yarn is laid in parallel at a second preset angle, and the second weft yarn is laid in parallel in a direction perpendicular to the second warp yarn.
Optionally, the first unidirectional cloth and the second unidirectional cloth are arranged in a 90-120-degree cross mode, and the second diversion grid and the third diversion grid are arranged in a 90-120-degree cross mode.
Alternatively, the first unidirectional cloth is laid at +m DEG or-m DEG, m is not less than 45 and not more than 60, and the second unidirectional cloth is laid at +n DEG or-n DEG, and n is not less than 45 and not more than 60.
Alternatively, the first unidirectional cloth is laid at + -45 DEG or + -60 DEG, and the second unidirectional cloth is laid at + -45 DEG or + -60 deg.
Alternatively, the chopped fiber layer is formed by unoriented tiling chopped glass fibers, and the length of the chopped glass fibers is 5-7 cm.
According to another aspect of the invention, a preparation method of the glass fiber composite felt is provided, and the preparation method comprises the following steps of S1, feeding first unidirectional cloth into a stitching device at a first preset angle, feeding second unidirectional cloth into the stitching device at the first preset angle, paving the first unidirectional cloth on the second unidirectional cloth, S2, cutting glass fibers into short glass fibers with the length of 5-7 cm, paving the short glass fibers on the first unidirectional cloth to form a short fiber layer, and S3, stitching the first unidirectional cloth, the second unidirectional cloth and the short fiber layer together by using first binding yarns.
Optionally, the method further comprises the steps of knitting the first unidirectional fabric, wherein (101) the first warp yarns are led into a hinge loom, the density of the first warp yarns is determined according to the unit area mass of the first unidirectional fabric, (102) the first warp yarns are arranged in parallel according to the preset density along the 0-degree direction, (103) the first weft yarns are led into the hinge loom, the density of the first weft yarns is determined according to the unit area mass of the first unidirectional fabric, the first weft yarns are arranged in parallel according to the preset density, and (104) the first warp yarns and the first weft yarns are sewn into the unidirectional fabric through second binding.
Optionally, the method further comprises the steps of knitting the second unidirectional fabric, wherein (201) the second warp yarns are led into a hinge loom, the density of the first warp yarns is determined according to the unit area mass of the second unidirectional fabric, (202) the second warp yarns are arranged in parallel according to the preset density along the 0-degree direction, (203) the second weft yarns are led into the hinge loom, the density of the second weft yarns is determined according to the unit area mass of the second unidirectional fabric, the second weft yarns are arranged in parallel according to the preset density, and (204) the second warp yarns and the second weft yarns are sewn into the second unidirectional fabric through third binding.
The glass fiber composite felt provided by the application is woven through a weaving process of secondary forming, so that the space thickness of the fabric is increased, and the resin space runner is increased. The unidirectional fabric diagonal laying and the twice stitch-bonding process are adopted, so that the uniformity of gaps among the textile yarns is improved, and the straightness and structural stability of weft yarns are ensured. The horizontal resin infusion speed of the glass fiber composite felt is 2 times faster than that of one-step forming fabrics with the same specification, so that the blade manufacturing efficiency is greatly improved, and the infusion risk of large blades is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of the structure of a glass fiber composite mat in an embodiment;
FIG. 2 is a side view of a glass fiber composite mat according to an embodiment;
fig. 3 is a schematic view of a unidirectional fabric in an embodiment.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. It should be noted that, in the case of no conflict, the embodiments of the present application and the feature vectors in the embodiments may be arbitrarily combined with each other.
As the global wind power market turns to low wind speed and wind energy development of offshore wind farms, the blades are continuously increased, and in the future, the wind power is in the sea or on land, and the wind power is in the large-blade type and light-weight direction. However, blade enlargement also presents challenges of (1) mass increase, (2) manufacturing and reliability, (3) material cost, (4) transportation, (5) aeroelastic stability (flutter), (6) buckling, (7) fatigue loading due to gravity, and (8) offshore wind regime application.
The most outstanding problem faced by the development of offshore wind farms is the problem of resin infusion speed in the manufacturing process, the resin curing time is about 3 hours, as the blades become larger, the time required for blade infusion becomes longer and longer, and once the resin flow speed is insufficient, glass fibers are not fully infiltrated or are not fully saturated with the resin, so that the whole blade can be scrapped. However, the existing glass fibers are difficult to meet the requirement of the large-scale development of the blades on the resin infiltration speed, and the development of the offshore wind farm is greatly limited.
Therefore, the application provides the glass fiber composite felt which is woven through a weaving process of secondary forming, so that the space thickness of the fabric is increased, and the resin space runner is increased. The unidirectional fabric diagonal laying and the twice stitch-bonding process are adopted, so that the uniformity of gaps among the textile yarns is improved, and the straightness and structural stability of weft yarns are ensured. The horizontal resin infusion speed of the glass fiber composite felt is 2 times faster than that of one-step forming fabrics with the same specification, so that the blade manufacturing efficiency is greatly improved, and the infusion risk of large blades is reduced.
The glass fiber composite felt comprises a first unidirectional cloth 01, a second unidirectional cloth 02, a chopped fiber layer 03 and a first binding yarn 04, wherein the first unidirectional cloth 01 is laid on the second unidirectional cloth 02, the chopped fiber layer 03 is laid on the first unidirectional cloth 01, the first binding yarn 04 is used for knitting the first unidirectional cloth 01, the second unidirectional cloth 02 and the chopped fiber layer 03 together so that a first diversion channel 05 is formed between the first unidirectional cloth 01 and the second unidirectional cloth 02, the first unidirectional cloth 01 is laid at a first preset angle, the second unidirectional cloth 02 is laid at a second preset angle, and the first unidirectional cloth 01 and the second unidirectional cloth 02 are crossed and knitted together through the first binding yarn 04 at a preset angle. The glass fiber composite felt is of a double-layer structure, the first unidirectional cloth 01 and the second unidirectional cloth 02 are stitched into a solid structure, gaps between the first unidirectional cloth 01 and the second unidirectional cloth 02 form a first flow guide channel 05, and compared with the existing unidirectional fabric, when the glass fiber composite felt is used for pouring resin, the resin can accelerate the pouring speed of the first unidirectional cloth 01 and the second unidirectional cloth 02 through the first flow guide channel 05.
As an example, the first unidirectional cloth 01 is stitched by a first warp yarn and a first weft yarn through a second binder yarn such that a second flow guide grid 011 is formed between the first warp yarn and the first weft yarn, the first warp yarn being laid parallel at a first predetermined angle, the first weft yarn being laid parallel in a direction perpendicular to the first warp yarn.
The second unidirectional cloth 02 is formed by stitching second warp yarns and second weft yarns through a third binding yarn so that a third diversion grid 022 is formed 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.
The first warp yarn and the first weft yarn of the first unidirectional cloth 01 form a second flow guide grid 011, and the second flow guide grid 011 is a uniform square grid or a rectangular grid according to the arrangement density of the first warp yarn and the first weft yarn.
The second warp yarn and the second weft yarn of the second unidirectional cloth 02 form a third flow-guiding mesh 022, and the third flow-guiding mesh 022 is a uniform square mesh or a rectangular mesh according to the arrangement density of the second warp yarn and the second weft yarn.
When the glass fiber fabric is used for pouring resin, the more the number of the flow guide grids is, the more the shape of the flow guide grids is uniform, the faster the pouring speed is, and the two-layer grid structure comprising the second flow guide grid 011 and the third flow guide grid 022 is more than the conventional glass fiber fabric, and the first flow guide channel 05 is further arranged between the first unidirectional cloth 01 and the second unidirectional cloth 02, so that a double-layer three-dimensional flow guide space structure is formed, and the resin pouring speed is accelerated.
As an example, the first unidirectional cloth 01 and the second unidirectional cloth 02 are arranged in a 90-120-degree cross mode, and the second diversion grid 011 and the third diversion grid 022 are arranged in a 90-120-degree cross mode. For example, the intersection may be 95 °, 100 °, 105 °, 110 °, 115 °.
Based on the above example, in one possible embodiment, as shown in fig. 3, the unidirectional cloth in the glass fiber composite mat of the present application, warp yarn 001 and weft yarn 002 are cross-bound to form square or square-like flow-guiding grid 003.
Based on the above example, in another possible embodiment, the unidirectional fabric in the glass fiber composite mat of the present application may be a unidirectional base fabric obtained by binding 90 ° weft yarns, the unidirectional base fabric not including 0 ° warp yarns and a flow guiding grid.
As an example, the first unidirectional cloth 01 is laid in parallel at +m DEG or-m DEG, wherein m is not less than 45 and not more than 60, and the second unidirectional cloth 02 is laid in parallel at +n DEG or-n DEG, wherein n is not less than 45 and not more than 60.
As an example, the first warp yarn of the first unidirectional cloth 01 and the second warp yarn of the second unidirectional cloth 02 are cross-stitched together at 90-120 degrees, and the first weft yarn of the first unidirectional cloth 01 and the second weft yarn of the second unidirectional cloth 02 are cross-stitched at 90-120 degrees.
As an example, the first unidirectional cloth 01 is laid at ±45° or ±60°, and the second unidirectional cloth 02 is laid at ±45° or ±60°.
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 diversion grid 011 and the third diversion grid 022 are the same in shape and size, and when resin is poured, the glass fiber felt is uniformly poured, so that the pouring speed is faster.
As an example, the chopped fiber layer 03 is formed by non-directional tiling of chopped glass fibers, and the length of the chopped glass fibers is 5-7 cm.
The preparation method of the glass fiber composite felt comprises the following steps:
S1, feeding the first unidirectional cloth 01 into the stitching device at a first preset angle, simultaneously feeding the second unidirectional cloth 02 into the stitching device at a first preset angle, and paving the first unidirectional cloth 01 on the second unidirectional cloth 02.
S2, cutting the glass fibers into chopped glass fibers with the length of 5-7 cm, and spreading the chopped glass fibers on the first unidirectional cloth 01 to form a chopped fiber layer 03.
S3 the first unidirectional cloth 01, the second unidirectional cloth 02 and the chopped fiber layer 03 are stitched together with the first binder yarns 04.
As an example, the method further comprises the steps of knitting the first unidirectional cloth 01, including (101) introducing the first warp yarn into a hinge loom, determining the density of the first warp yarn according to the mass per unit area of the first unidirectional cloth 01, (102) arranging the first warp yarn in parallel with a predetermined density in the 0 DEG direction, (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 cloth 01, arranging the first weft yarn in parallel with a predetermined density, and (104) knitting the first warp yarn and the first weft yarn into the first unidirectional cloth 01 by using a second binding yarn.
As an example, the method further comprises the steps of knitting the second unidirectional cloth 02, including (201) introducing the second warp yarn into a hinge loom, determining the density of the first warp yarn based on the mass per unit area of the second unidirectional cloth 02, (202) arranging the second warp yarn in parallel with a predetermined density in the 0 DEG direction, (203) introducing the second weft yarn into the hinge loom, determining the density of the second weft yarn based on the mass per unit area of the second unidirectional cloth 02, arranging the second weft yarn in parallel with a predetermined density, and (204) knitting the second warp yarn and the second weft yarn into the second unidirectional cloth 02 with a third binder yarn.
As an example, the first unidirectional cloth 01 and the second unidirectional cloth 02 in the present application are the same. Under this condition, the preparation method of the glass fiber composite felt provided by the application comprises the following steps:
The method comprises the steps of guiding warp yarns into a hinge loom, determining the density of the warp yarns according to the unit area mass of unidirectional cloth, arranging the warp yarns in parallel according to the preset density along the 0-degree direction, guiding weft yarns into the hinge loom, determining the density of the weft yarns according to the unit area mass of unidirectional cloth, arranging the weft yarns in parallel according to the preset density, and stitching a first warp yarn and a first weft yarn into unidirectional cloth by unidirectional cloth binding yarns.
And (3) placing the two unidirectional cloth rolls behind the braiding device, drawing the unidirectional cloth rolls arranged above to +45-60 degrees, drawing the unidirectional cloth rolls arranged below to-45-60 degrees, and respectively conveying the two unidirectional cloths into the braiding device by using a cloth feeding frame.
Cutting glass fibers into chopped glass fibers with the length of 5-7 cm, and spreading the chopped glass fibers on the first unidirectional cloth 01 to form a chopped fiber layer 03.
The two unidirectional cloths and the chopped fiber layer 03 are stitch-bonded together with a first binder yarn 04 to obtain a glass fiber mat.
The method for preparing the glass fiber composite mat according to the present invention will be explained in detail by way of specific examples.
Example 1
The total unit area mass (gram weight) of the glass fiber composite felt E-BIAX600/M100-t (+ -60 DEG), E-BIAX600/M100-t (+ -60 DEG) fabric is (778+ -5%) g/M 2. E-BIAX/M100-t (+ -60 DEG) comprises a first unidirectional cloth, a second unidirectional cloth, a chopped fiber layer and first binding yarns, wherein the first unidirectional cloth is laid on the second unidirectional cloth, the chopped fiber layer is laid on the first unidirectional cloth, and the first binding yarns stitch the first unidirectional cloth, the second unidirectional cloth and the chopped fiber layer together. The first unidirectional cloth is laid at +60 DEG, the second unidirectional cloth is laid at-60 DEG, and the first unidirectional cloth and the second unidirectional cloth are crossed and stitched together by the first binding yarns at a predetermined angle.
The preparation method of the glass fiber composite felt E-BIAX/M100-T (+ -60 DEG) comprises the following steps of firstly producing T-shaped unidirectional cloth with gram weight of (291+/-3%) g/M 2 in unit area on a twisting machine, using EC9-68 yarns for 0 DEG warp, and controlling the mass of the unit area at (27+/-3%) g/M 2 in a mode of passing through the yarns one by one, wherein the yarn density is 202ends/10 cm. The 90-degree weft yarn is made of E6DR17-1200 yarns, the yarn density is 22ends/10cm, the unit area quality is controlled at (264+/-3%) g/m 2, and the two yarns are twisted into T-shaped unidirectional cloth. And then pulling the two layers of T-shaped unidirectional fabrics to +/-60 degrees at the back Fang Zaixian of the needle bed of the knitting device, controlling the deviation of yarn angles to +/-2 degrees, and feeding the two layers of T-shaped unidirectional fabrics into the knitting area of the needle bed of the knitting device by adopting a cloth feeding frame, wherein the unit area quality of single-layer base fabrics is controlled to be (335 +/-3%) g/m 2. Cutting ER13-2400 chopped yarns into chopped glass fibers with the length of 5-7cm by using a chopping device, uniformly dispersing the chopped glass fibers in all directions on an upper layer T-shaped unidirectional cloth to form a chopped fiber layer, controlling the unit area quality of the chopped fiber layer to be (100+/-10%) g/m 2, and monitoring abnormal conditions such as chopping continuous cutter, sticking roller, uneven dispersion and the like by using an infrared on-line monitoring device. The method is characterized in that 100D low-elastic polyester yarns are used as first binding yarns, two layers of T-shaped unidirectional cloth and chopped fiber layers are stitch-bonded together through squaring, stitch density is 3.5sti/inch, stitch length is 4.0mm, unit area mass is (8.5+/-1) g/m 2, and the fabric is formed by automatic winding after chopping.
Example 2
The total unit area mass (gram weight) of the glass fiber composite felt E-BX1200/M100-t and the E-BX1200/M100-t fabric is (1324+/-5%) g/M 2. The E-BX1200/M100-t comprises a first unidirectional cloth, a second unidirectional cloth, a chopped fiber layer and first binding yarns, wherein the first unidirectional cloth is laid on the second unidirectional cloth, the chopped fiber layer is laid on the first unidirectional cloth, and the first binding yarns stitch the first unidirectional cloth, the second unidirectional cloth and the chopped fiber layer together. The first unidirectional cloth is laid at +45°, the second unidirectional cloth is laid at-45 ° and the first unidirectional cloth and the second unidirectional cloth are stitched together by the first binder yarns at predetermined angles.
The preparation method of the E-BX1200/M100-T comprises the following steps of producing T-shaped unidirectional cloth with gram weight of 429+/-3% g/M 2 in unit area on an HS machine, paving weft yarn with yarn HS of E6DR17-2400 at 90 degrees, controlling the mass of the unit area to be 425+/-3% g/M 2, adopting terylene yarn specifications of 100D low-elasticity light net as unidirectional cloth binding yarn, stitch-knitting in a chain knitting mode, and having density of 3.0sti/inch, CPI of 9.0sti/inch and mass of 4+/-1 g/M 2 in unit area. And then pulling the two layers of T-shaped unidirectional fabrics to +/-45 degrees at the back Fang Zaixian of the needle bed of the knitting device, controlling the deviation of yarn angles in the fabrics to +/-2 degrees, and automatically feeding the two layers of T-shaped unidirectional fabrics into the knitting area of the needle bed of the knitting device by adopting a cloth feeding frame, wherein the quality of the unit area of single-layer base fabric is controlled to be (609 +/-3%) g/m 2. Cutting ER13-2400 chopped yarns into short cuts with the length of 5-7cm by using a chopping device, uniformly dispersing the short cuts on the T-shaped unidirectional cloth on the upper layer to form a chopped fiber layer, controlling the unit area quality of the chopped fiber layer to be (100+/-10%) g/m 2, and monitoring abnormal conditions such as chopping continuous knives, sticking rollers, uneven dispersion and the like by using an infrared on-line monitoring device. The method is characterized in that 100D low-stretch polyester yarns are used as first binding yarns, two layers of T-shaped unidirectional cloth and chopped fiber layers are stitch-bonded together through squaring, the density is 7sti/inch, the stitch length is 4.0mm, the unit area mass is (7+/-1) g/m 2, and the fabric is formed by automatic winding through chopping.
Example 3
The glass fiber composite felt E-BX400/M275-t, and the total unit area mass (gram weight) of the E-BX400/M275-t is (725+/-5%) g/M 2. The E-BX400/M275-t comprises a first unidirectional cloth, a second unidirectional cloth, a chopped fiber layer and first binding yarns, wherein the first unidirectional cloth is laid on the second unidirectional cloth, the chopped fiber layer is laid on the first unidirectional cloth, and the first binding yarns stitch the first unidirectional cloth, the second unidirectional cloth and the chopped fiber layer together. The first unidirectional cloth is laid at +45°, the second unidirectional cloth is laid at-45 ° and the first unidirectional cloth and the second unidirectional cloth are stitched together by the first binder yarns at predetermined angles.
The preparation method of the E-BX400/M275-T comprises the following steps of firstly producing T-shaped unidirectional cloth with the gram weight of 155+/-3%g/M 2 in unit area on an HS machine, paving 90-degree weft yarns by using yarns HS of E6DR17-600, controlling the mass of the unit area to be 151+/-3%g/M 2, adopting terylene yarn specifications of 100D low-elasticity light net as unidirectional cloth binding yarns, stitch-knitting in a chain knitting mode, and having the density of 3.0sti/inch, the CPI of 6.4sti/inch and the mass of the unit area of (4+/-1) g/M 2. And then pulling the two layers of T-shaped unidirectional fabrics to +/-45 degrees at the back Fang Zaixian of the needle bed of the knitting device, controlling the deviation of yarn angles in the fabrics to +/-2 degrees, automatically feeding the two layers of T-shaped unidirectional fabrics into the needle bed knitting area of the knitting device, and controlling the unit area quality of the single-layer T-shaped unidirectional fabrics to be (219 +/-3%) g/m 2. Cutting ER13-2400 chopped yarns into chopped glass fibers with the length of 5-7cm by using a chopping device, uniformly dispersing the chopped glass fibers on an upper T-shaped unidirectional cloth to form a chopped fiber layer, controlling the unit area quality of the chopped fiber layer to be (275+/-10%) g/m 2, and monitoring abnormal conditions such as chopped continuous cutting, sticking rollers, uneven dispersion and the like by using an infrared online monitoring device. The T-shaped unidirectional cloth has the density of 7sti/inch, the stitch length of 2.82mm, the unit area mass of (12+/-1) g/m 2 and the cut-in inner part is automatically rolled.
Example 4
The total unit area mass (gram weight) of the E-BX600/M275-t fabric of the glass fiber composite felt is controlled to be (893+/-5%) g/M 2. E-BX600/M275-t comprises a first unidirectional cloth, a second unidirectional cloth, a chopped fiber layer and a first binding yarn, wherein the first unidirectional cloth is laid on the second unidirectional cloth, the chopped fiber layer is laid on the first unidirectional cloth, and the first binding yarn is used for knitting the first unidirectional cloth, the second unidirectional cloth and the chopped fiber layer together. The first unidirectional cloth is laid at +45°, the second unidirectional cloth is laid at-45 ° and the first unidirectional cloth and the second unidirectional cloth are stitched together by the first binder yarns at predetermined angles.
The E-BX600/M275-T is prepared by producing T-shaped unidirectional cloth with gram weight of 213+/-3%g/M 2 per unit area on an HS machine, paving 90-degree weft yarns with yarns HS of E6DR14-735, controlling the quality of the unit area to 209+/-3%g/M 2, adopting a polyester yarn specification of 100D low-elastic light net as a binding line, stitch-knitting in a chain-knitting mode, and having density of 3.0sti/inch, CPI of 7.21sti/inch and unit area quality of (4+/-1) g/M 2. And then pulling the two layers of T-shaped unidirectional fabrics to +/-45 degrees at the back Fang Zaixian of the needle bed of the knitting device, controlling the deviation of the yarn angle in the fabrics to +/-2 degrees, automatically feeding the base fabrics into the knitting area of the needle bed of the knitting device, and controlling the unit area quality of the single-layer unidirectional fabrics to be (303 +/-3%) g/m 2. Cutting ER13-2400 chopped yarns into chopped glass fibers with the length of 5-7cm by using a chopping device, uniformly dispersing the chopped glass fibers on an upper layer T-shaped unidirectional cloth to form a chopped fiber layer, controlling the unit area quality of the chopped fiber layer to be (275+/-10%) g/m 2, and monitoring abnormal conditions such as chopped continuous cutting, sticking rollers, uneven dispersion and the like by using an infrared online monitoring device. The 100D low-elastic polyester yarn is used as a first binding yarn, two layers of T-shaped unidirectional cloth and a chopped fiber layer are knitted together through square stitch bonding, the stitch density is 7sti/inch, the stitch length is 2.82mm, the unit area mass is (12+/-1) g/m 2, and the fabric is automatically rolled up by the inside of a cut.
Comparative test example
The properties of the glass fiber mats of examples 1-4 were tested. Meanwhile, aiming at the condition that a conventional E-BX600M100 product is formed on multi-axial warp knitting equipment at one time in the prior art (two weft spreaders are placed front and back in the plus or minus 45-degree direction of the weft spreading area and the equipment, E6DR13-300 yarns are crossly paved in the plus or minus 45-degree direction through the weft spreaders, chopped glass fibers with the length of 5-7cm are evenly scattered on a conveying belt by a chopping device, the yarns and the chopped glass fibers enter a needle bed along with the conveying belt to be stitch together, 100D low-elasticity polyester yarns are used as first binding yarns, two layers of yarns and chopped fiber layers are stitch together through square stitch bonding, and the performance data of the glass fiber fabric with the stitch density of 7sti/inch, the stitch length of 3.4mm and the unit area mass of (10 plus or minus 1) g/M 2) are compared, and the performance data of the glass fiber fabric is specifically shown in the table 1.
Table 1 results of performance testing and comparison
The perfusion rate test method adopted in the table 1 of the application is a vacuum horizontal saturation test, the size of the sample cloth is 30 x 60cm, and the static mechanical test adopts 0-90-degree tensile test standard ISO527-4.
As can be seen from Table 1, the glass fiber mats of the present application have a 30 x 60cm infusion rate of only 8.3 minutes, which is more than 2 times faster than the infusion rate of the prior art once-formed fabrics of the same gauge, and the 0℃tensile modulus and 90℃tensile modulus (GPa) of the glass fiber mats of the present application are higher than the tensile modulus of the once-formed fabrics of the same gauge.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of additional identical elements in an article or apparatus that includes the element.
The above embodiments are only for illustrating the technical scheme of the present invention, not for limiting the same, and the present invention is described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the present invention is intended to be covered by the scope of the appended claims.
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