CN111497289A - Pultrusion device and preparation process of high-strength FRP material - Google Patents
Pultrusion device and preparation process of high-strength FRP material Download PDFInfo
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- CN111497289A CN111497289A CN202010349888.5A CN202010349888A CN111497289A CN 111497289 A CN111497289 A CN 111497289A CN 202010349888 A CN202010349888 A CN 202010349888A CN 111497289 A CN111497289 A CN 111497289A
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- yarn collecting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/521—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement before the die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/525—Component parts, details or accessories; Auxiliary operations
- B29C70/528—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a pultrusion device of a high-strength FRP material, which is characterized by comprising a yarn collecting part, a glue solution dipping part, a glue extruding part, a thermoforming part and a traction part, wherein the yarn collecting part is arranged at the bottom of the yarn collecting part; the yarn collecting part comprises a creel, a first yarn collecting plate, a second yarn collecting plate and a third yarn collecting plate; the glue solution impregnation part comprises a glue impregnation tank, a first heating device, a first yarn pressing drum, a second yarn pressing drum and a third yarn pressing drum; the glue extruding part comprises a preforming die and a glue collecting plate; the thermal forming part comprises a pultrusion die and a second heating device; the pultrusion process for the high-strength FRP material disclosed by the invention has the advantages of ensuring that fibers in an FRP pultrusion product are not crossed, fully impregnating fiber roving and fully extruding redundant glue solution and the like, thereby realizing the preparation of the high-strength FRP pultrusion material.
Description
Technical Field
The invention relates to the field of material manufacturing, in particular to a pultrusion process of a high-strength FRP material.
Background
Frp (fiber reinforced plastics) materials are structural materials having a certain or specific shape formed by curing fibers and a resin matrix through a certain process. The FRP material has excellent properties of light weight, high strength and corrosion resistance, and has wider application scenes compared with traditional engineering materials such as reinforcing steel bars, steel plates and the like in the field of civil engineering. In engineering reinforcement, the advantages are mainly shown in that: (a) the weight is light: the self weight of the structure is not increased, the influence on the structure is small, and the construction is convenient; (b) small thickness, small influence on the structural clearance, etc. The pultrusion process is a common preparation method of FRP materials, and the process is an automatic production process which is characterized in that the twistless fiber roving on a creel is impregnated by glue solution through the continuous traction of a traction device, passes through a heating mould with a fixed section shape under the action of tension, is solidified and molded in the mould, and realizes the continuous demoulding. Due to the process, the existing FRP pultrusion product has low strength, cannot give full play to the high-strength performance of the fiber, and limits the further application and popularization of FRP materials.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a high-strength FRP material pultrusion device and a preparation process of the high-strength FRP material, aiming at overcoming the defects of the prior art, so that the fibers in an FRP pultrusion product are prevented from crossing, fiber roving is fully impregnated and redundant glue solution is fully extruded, and the strength of the FRP pultrusion material is improved.
The technical scheme is as follows: the pultrusion device of the high-strength FRP material comprises a yarn collecting part, a glue solution dipping part, a glue extruding part, a thermoforming part and a traction part; wherein:
the yarn collecting part comprises a creel, a first yarn collecting plate, a second yarn collecting plate and a third yarn collecting plate; the yarn barrel wound with fiber roving is placed on a creel, a plurality of holes are formed in the first yarn collecting plate, the second yarn collecting plate and the third yarn collecting plate respectively, the hole number of the first yarn collecting plate, the hole number of the second yarn collecting plate and the hole number of the third yarn collecting plate are sequentially reduced, and the fiber roving sequentially passes through the holes formed in the first yarn collecting plate, the second yarn collecting plate and the third yarn collecting plate;
the glue solution impregnation part comprises a glue impregnation tank, a first heating device, a first yarn pressing drum, a second yarn pressing drum and a third yarn pressing drum; the first yarn collecting plate and the second yarn collecting plate press fiber roving between the first yarn collecting plate and the second yarn collecting plate into the glue dipping tank; the third yarn pressing cylinder is positioned behind the second yarn pressing cylinder, and the fiber roving winds above the third yarn pressing cylinder and penetrates into the hole of the second yarn collecting plate;
the glue extruding part comprises a preforming die and a glue collecting plate; the preforming die is formed by splicing an upper steel plate and a lower steel plate, the opposite surfaces of the two steel plates are cambered surfaces, a wedge-shaped groove is formed by the two cambered surfaces in a surrounding mode, and the fiber roving penetrates out of the third yarn collecting plate and then enters the wedge-shaped groove; a plurality of glue discharging holes are formed in the lower steel plate, the glue collecting plate is positioned below the preforming mold, glue solution infected on the fiber roving is discharged into the glue collecting plate through the glue discharging holes under the extrusion of the preforming mold, and the glue collecting plate is communicated with the glue dipping tank;
the thermal forming part comprises a pultrusion die and a second heating device; the pultrusion die is positioned at the rear part of the preforming die, the fiber roving enters the pultrusion die after passing through the preforming die, and the second heating device is positioned in the pultrusion die and is used for heating and curing the fiber roving in the pultrusion die;
the traction part is used for drawing fiber roving on the yarn barrel to sequentially pass through the yarn collecting part, the glue solution dipping part, the glue extruding part and the thermal forming part.
According to a further preferable technical scheme, the creel is provided with an adjusting device for adjusting the rotating speed of the yarn barrel.
Preferably, the size of an entrance of a wedge-shaped groove surrounded by the upper steel plate and the lower steel plate of the preforming device is 1.2-2.0 times of the size of the section of the FRP product to be prepared, and the size of the section of the wedge-shaped groove from 20mm close to an exit end to the exit end is consistent with the size of the section of the FRP product to be prepared.
Preferably, smooth arc-shaped inner wall plastic sleeve fasteners are arranged on holes formed in the first yarn collecting plate and the second yarn collecting plate.
Preferably, the third yarn collecting plate is a flat steel plate, and the turning part of the inner wall of the third yarn collecting plate is subjected to chamfering treatment.
Preferably, the first yarn pressing drum, the second yarn pressing drum and the third yarn pressing drum are all cylindrical rollers, and rollers are arranged inside the rollers.
The process for preparing the high-strength FRP material by the pultrusion device comprises the following steps:
(1) the yarn cylinder is arranged on the creel, fiber roving drawn out of the creel passes through the holes in the first yarn collecting plate bundle by bundle, and yarn threading is carried out on the principle of non-intersection and shortest path;
(2) after the fiber roving passes through the first yarn collecting plate, the fiber roving is immersed into glue solution of a glue dipping tank for full dipping under the steering of a first yarn pressing cylinder and a second yarn pressing cylinder, the fiber roving is bunched in pairs and passes through the second yarn collecting plate, and then the fiber roving bypasses a third yarn pressing cylinder and passes through a third yarn collecting plate;
(3) the fiber roving penetrates out from the third yarn collecting plate and then is completely gathered together to penetrate into the preforming device, the preliminary molding of an FRP pultrusion product is completed, a preliminarily molded impregnation yarn blank enters a pultrusion die, after the impregnation yarn blank enters the pultrusion die, the second heating device is adopted for carrying out graded heating and curing, the fiber roving is cured and molded in the pultrusion die, the molded FRP product penetrates into a traction part, and under the traction of the traction part, the continuous pultrusion of the FRP material is realized.
Preferably, the fiber roving in the step (1) is one of carbon fiber, aramid fiber, glass fiber and basalt fiber.
Preferably, the glue solution in the dipping tank in the step (2) is a resin and aggregate mixture glue solution which is uniformly mixed; and a first heating device of the impregnation tank heats the glue solution to 45-60 ℃.
Preferably, when the FRP plate is prepared, the holes on the first yarn collecting plate, the second yarn collecting plate and the third yarn collecting plate are distributed in a rectangular array; when the FRP ribs are prepared, holes in the first yarn collecting plate, the second yarn collecting plate and the third yarn collecting plate are distributed annularly and uniformly.
Has the advantages that: (1) the pultrusion process of the high-strength FRP material has the advantages of ensuring that fibers in an FRP pultrusion product are not crossed, fully gumming fiber roving, fully extruding redundant glue solution and the like, thereby realizing the preparation of the high-strength FRP pultrusion material;
(2) the creel is used for placing the yarn barrel and can adjust the rotating speed of the yarn barrel, so that certain tension is kept on fiber roving in the pultrusion process, and the linearity of the fiber roving is realized;
(3) in the invention, smooth arc-shaped inner wall plastic sleeve fasteners are arranged in the holes of the first yarn collecting plate and the second yarn collecting plate, and the turning part of the inner wall of the hole of the third yarn collecting plate is subjected to chamfering treatment and is polished smoothly, so that the fiber bundle can be prevented from being damaged;
(4) according to the invention, a third yarn pressing cylinder is positioned above the front part of the second yarn pressing cylinder and used for preliminarily extruding redundant glue solution, a third yarn collecting plate is a flat steel plate, holes are arranged according to design requirements and used for further collecting dipped yarns and further extruding redundant glue solution, and the third yarn collecting plate is matched with a glue extruding part, so that the redundant glue solution can be fully extruded;
(5) the impregnation tank is used for containing the uniformly mixed resin and aggregate mixture glue solution, and a first heating device in the impregnation tank heats the glue solution to 45-60 ℃ to ensure the fluidity of the glue solution, so that the fiber roving is fully impregnated.
Drawings
FIG. 1 is a process flow diagram of a pultrusion process of a high-strength FRP material of the invention.
Fig. 2 is a partially enlarged view of a portion a of fig. 1.
Fig. 3 is a partially enlarged view of fig. 1 at B.
Fig. 4 is a schematic view of a first yarn collecting plate in embodiment 1 of the present invention.
FIG. 5 is a schematic view of a second collector in example 1 of the present invention.
FIG. 6 is a schematic view of a third collector in example 1 of the present invention.
Fig. 7 is a schematic view of a first yarn collecting plate in embodiment 2 of the present invention.
FIG. 8 is a schematic view of a second collector in example 2 of the present invention.
FIG. 9 is a schematic view of a third collector in example 2 of the present invention.
In the figure: 1. a creel; 2. a bobbin; 3. fiber roving; 4. a first yarn collecting plate; 5. plastic sleeve buttons; 6. a glue dipping tank; 7. a first heating device; 8. a first yarn pressing drum; 9. glue solution; 10. a second yarn pressing drum; 11. a third yarn pressing drum; 12. a second yarn collecting plate; 13. a third yarn collecting plate; 13-1, gathering yarn seams; 14. a preforming device; 15. a wedge-shaped groove; 16. arranging glue holes; 17. collecting the rubber plate; 18. a pultrusion die; 19. a second heating device; 20. FRP material; 21. a traction device.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example 1: a pultrusion device of high-strength FRP materials is used for preparing FRP plate pultrusion products.
The bobbin 2 is arranged on a creel 1, and the fiber roving yarns 3 are led out of the creel 1 and then pass out of the plastic sleeve buckle 5 of the first yarn collecting plate 4 one by one. The glue solution 9 of the uniformly mixed resin and filler mixture is contained in the glue dipping tank 6, and a first heating device 7 is arranged below the glue dipping tank 6 and used for heating the glue solution, so that the fluidity of the glue solution is improved, and the fiber roving is ensured to be fully dipped. A first yarn pressing cylinder 8 and a second yarn pressing cylinder 10 are arranged between the first yarn collecting plate 4 and the second yarn collecting plate 12 and used for pressing down the position of fiber roving to enable the fiber roving to be fully impregnated in the glue solution 9, and a third yarn pressing cylinder 11 is arranged at the front upper part of the second yarn pressing cylinder 10 and used for guiding the impregnated fiber roving away from the glue solution. The fiber rovings impregnated with the glue then pass through the second collector plate 12 and enter the preforming device 14 under the further accumulation of the third collector plate 13. The preforming device 14 is formed by splicing two steel plates, a smooth arc surface wedge-shaped groove 15 is formed in the preforming device, and a plurality of circular through holes, namely glue discharging holes 16, are formed below the smooth arc surface wedge-shaped groove and used for discharging redundant glue solution. The glue solution extruded by the glue discharging hole 16, the preforming device 15 and the third yarn collecting plate 13 is collected by the glue collecting plate 17 and then is led into a glue dipping tank, so that the recycling of the glue solution is realized. The impregnation fiber yarn blank extruded by the preforming device 15 passes through the pultrusion die 18, is cured and molded under the action of the second heating device 19 to form an FRP pultrusion product, and realizes the continuous production of the FRP pultrusion product under the action of the traction device 21.
The preparation process of the high-strength FRP plate comprises the following steps: the fiber roving 3 sequentially passes through the first yarn collecting plate 4, then adjacent holes are bundled to pass through the second yarn collecting plate 12, fiber yarns penetrating out of the second yarn collecting plate 12 sequentially pass through a yarn collecting seam 13-1 of the third yarn collecting plate 13 from top to bottom by taking each layer as a unit, and then enter a preforming device 14.
The first yarn collecting plate 4 and the second yarn collecting plate 12 are drawn to be flat steel plates with holes formed at designed positions, and smooth inner wall plastic sleeves 5 are sleeved in the holes to prevent fibers from being damaged; the number of holes of the second yarn collecting plate 12 is about half of the number of holes of the first yarn collecting plate.
The third yarn collecting plate 13 is a flat steel plate, and 3 yarn collecting seams 13-1 with the height of 0.6-1.0 t (t is the designed cross section thickness of the FRP plate) and the width of 1.2-1.6 b (b is the designed cross section width of the FRP plate) are sequentially arranged on the flat steel plate from top to bottom in parallel. And (3) chamfering the turning part of the inner wall of the traction yarn gathering seam 13-1, and polishing smoothly to prevent the fiber from being damaged.
The traction preforming device 14 is composed of two thick plates, an arc wedge-shaped groove 15 is formed in each thick plate, the height of a hole at the inlet end is 1.5-2.0 t, and the width of the hole is 1.2-1.5 b. The cross-sectional dimension from 20mm near the exit end to the exit end is consistent with the nominal cross-sectional dimension of the FRP panel.
Example 2: a pultrusion device of high-strength FRP materials is used for preparing FRP rib pultrusion products.
The embodiment is the same as the embodiment 1 except for the first yarn collecting plate, the second yarn collecting plate and the third yarn collecting plate.
In this embodiment, the number of the holes on the first yarn collecting plate 4, the second yarn collecting plate 12 and the third yarn collecting plate 13 is reduced in sequence, and the holes are distributed annularly around the center point, as shown in fig. 7, 8 and 9. The diameter of the inlet end of the cambered surface wedge-shaped groove 15 is 1.5-2.0 d (the designed diameter of the FRP rib), and the diameter of the section from the position close to the outlet end by 20mm to the outlet end is d.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A pultrusion device for high-strength FRP materials is characterized by comprising a yarn collecting part, a glue solution dipping part, a glue extruding part, a thermoforming part and a traction part; wherein:
the yarn collecting part comprises a creel, a first yarn collecting plate, a second yarn collecting plate and a third yarn collecting plate; the yarn barrel wound with fiber roving is placed on a creel, a plurality of holes are formed in the first yarn collecting plate, the second yarn collecting plate and the third yarn collecting plate respectively, the hole number of the first yarn collecting plate, the hole number of the second yarn collecting plate and the hole number of the third yarn collecting plate are sequentially reduced, and the fiber roving sequentially passes through the holes formed in the first yarn collecting plate, the second yarn collecting plate and the third yarn collecting plate;
the glue solution impregnation part comprises a glue impregnation tank, a first heating device, a first yarn pressing drum, a second yarn pressing drum and a third yarn pressing drum; the first yarn collecting plate and the second yarn collecting plate press fiber roving between the first yarn collecting plate and the second yarn collecting plate into the glue dipping tank; the third yarn pressing cylinder is positioned behind the second yarn pressing cylinder, and the fiber roving winds above the third yarn pressing cylinder and penetrates into the hole of the second yarn collecting plate;
the glue extruding part comprises a preforming die and a glue collecting plate; the preforming die is formed by splicing an upper steel plate and a lower steel plate, the opposite surfaces of the two steel plates are cambered surfaces, a wedge-shaped groove is formed by the two cambered surfaces in a surrounding mode, and the fiber roving penetrates out of the third yarn collecting plate and then enters the wedge-shaped groove; a plurality of glue discharging holes are formed in the lower steel plate, the glue collecting plate is positioned below the preforming mold, glue solution infected on the fiber roving is discharged into the glue collecting plate through the glue discharging holes under the extrusion of the preforming mold, and the glue collecting plate is communicated with the glue dipping tank;
the thermal forming part comprises a pultrusion die and a second heating device; the pultrusion die is positioned at the rear part of the preforming die, the fiber roving enters the pultrusion die after passing through the preforming die, and the second heating device is positioned in the pultrusion die and is used for heating and curing the fiber roving in the pultrusion die;
the traction part is used for drawing fiber roving on the yarn barrel to sequentially pass through the yarn collecting part, the glue solution dipping part, the glue extruding part and the thermal forming part.
2. The pultrusion apparatus for high-strength FRP material as claimed in claim 1, characterized in that the creel is provided with an adjusting device for adjusting the rotating speed of the bobbin.
3. The pultrusion device for the high-strength FRP material as claimed in claim 1, wherein the dimension of the entrance of the wedge-shaped groove surrounded by the upper and lower steel plates of the preforming device die is 1.2-2.0 times of the dimension of the section of the FRP product to be prepared, and the dimension of the section of the wedge-shaped groove from 20mm near the exit end to the exit end is consistent with the dimension of the section of the FRP product to be prepared.
4. The pultrusion device for high-strength FRP materials as claimed in claim 1, wherein the holes formed on the first yarn collecting plate and the second yarn collecting plate are provided with round arc-shaped inner wall plastic buckles.
5. The pultrusion device for high-strength FRP materials as claimed in claim 4, wherein the third yarn collecting plate is a flat steel plate, and the turning part of the inner wall of the third yarn collecting plate is chamfered.
6. The pultrusion device for high-strength FRP materials as claimed in claim 1, wherein the first yarn pressing drum, the second yarn pressing drum and the third yarn pressing drum are all cylindrical rollers, and rollers are installed inside the rollers.
7. A process for preparing a high strength FRP material using the pultrusion apparatus as recited in claim 1, comprising the steps of:
(1) the yarn cylinder is arranged on the creel, fiber roving drawn out of the creel passes through the holes in the first yarn collecting plate bundle by bundle, and yarn threading is carried out on the principle of non-intersection and shortest path;
(2) after the fiber roving passes through the first yarn collecting plate, the fiber roving is immersed into glue solution of a glue dipping tank for full dipping under the steering of a first yarn pressing cylinder and a second yarn pressing cylinder, the fiber roving is bunched in pairs and passes through the second yarn collecting plate, and then the fiber roving bypasses a third yarn pressing cylinder and passes through a third yarn collecting plate;
(3) the fiber roving penetrates out from the third yarn collecting plate and then is completely gathered together to penetrate into the preforming device, the preliminary molding of an FRP pultrusion product is completed, a preliminarily molded impregnation yarn blank enters a pultrusion die, after the impregnation yarn blank enters the pultrusion die, the second heating device is adopted for carrying out graded heating and curing, the fiber roving is cured and molded in the pultrusion die, the molded FRP product penetrates into a traction part, and under the traction of the traction part, the continuous pultrusion of the FRP material is realized.
8. The process for preparing high strength FRP material according to claim 7 wherein in step (1) the fiber rovings are one of carbon fiber, aramid fiber, glass fiber and basalt fiber.
9. The process for preparing high-strength FRP material according to claim 7, wherein the glue solution in the dip tank in the step (2) is a resin and aggregate mixture glue solution which is uniformly mixed; and a first heating device of the impregnation tank heats the glue solution to 45-60 ℃.
10. The process for preparing high-strength FRP material according to claim 7, wherein the holes on the first yarn collecting plate, the second yarn collecting plate and the third yarn collecting plate are distributed in a rectangular array when preparing FRP plates; when the FRP ribs are prepared, holes in the first yarn collecting plate, the second yarn collecting plate and the third yarn collecting plate are distributed annularly and uniformly.
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| CN112976607A (en) * | 2021-05-06 | 2021-06-18 | 华北水利水电大学 | FRP (fiber reinforced plastic) section fiber concrete composite construction method and structure for enhancing fatigue load |
| CN113400687A (en) * | 2021-06-25 | 2021-09-17 | 四川东树新材料有限公司 | Method for continuously producing pultruded epoxy glass fiber board for ultra-long time |
| CN114368135A (en) * | 2021-12-31 | 2022-04-19 | 永高股份有限公司 | Yarn feeding structure of composite pipe production equipment |
| CN114589944A (en) * | 2022-03-31 | 2022-06-07 | 常州市新创智能科技有限公司 | Preparation method of composite material pultrusion flat plate with high conversion rate |
| CN114700230A (en) * | 2022-03-14 | 2022-07-05 | 鼎辉光电通信(江苏)有限公司 | Glass yarn curing coating device and curing coating preparation process |
| CN114770979A (en) * | 2022-03-31 | 2022-07-22 | 常州市宏发纵横新材料科技股份有限公司 | Preparation method for stably producing pultruded flat plate at high speed |
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| CN113400687A (en) * | 2021-06-25 | 2021-09-17 | 四川东树新材料有限公司 | Method for continuously producing pultruded epoxy glass fiber board for ultra-long time |
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