Technology for directly manufacturing glass fiber thin cloth by using twistless roving

Abstract

The invention discloses a technology for manufacturing glass fiber thin cloth by direct twistless roving, which comprises the following production steps: hundreds of direct twistless roving bobbins are orderly mounted on a large creel according to process requirements, the capacity of the creel determines the capacity of a production line and the maximum gram weight of the thin cloth which can be produced, and the maximum gram weight of the thin cloth is larger than the maximum gram weight of the direct twistless roving bobbins. Each rough yarn is unwound from a yarn drum and is guided to a bundling plate through a yarn guide device, and a tension control device is arranged on the whole unwinding path to ensure that the tension of each rough yarn is constant and uniform; fibers are monofilaments and randomly and uniformly fall through an airflow field, a baffle and a screen, and a uniform fiber cotton layer is formed on a mesh belt in cooperation with a vacuum suction device, so that the distribution consistency of the fibers in the thin cloth is ensured, and the mechanical property and the structural stability are favorably improved; the tension of each roving is ensured to be constant and uniform through the magnetic tensioner, and the production deviation can be adjusted in time by real-time monitoring of the ray thickness gauge and combination of closed-loop control, so that the quality stability of the glass fiber thin cloth is effectively ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of glass fiber cloth production and processing, in particular to a technology for making glass fiber cloth by directly twisting roving. BACKGROUND

[0002] In the industrial field, glass fiber cloth is widely used in many fields such as electronics, aerospace, construction, etc. due to its light weight, high strength, corrosion resistance and other excellent characteristics. With the continuous development of these fields, higher requirements are put forward for the performance of glass fiber cloth. Not only does it need to have good mechanical properties and structural stability, but also needs to ensure the stability and reliability of the quality, while meeting the diversified needs of different scenarios.

[0003] The existing glass fiber cloth production technology has certain limitations. In terms of fiber distribution, the traditional technology is difficult to achieve single fiber and random uniform falling of the fiber, resulting in uneven distribution of the fiber inside the cloth, which affects its mechanical properties and structural stability, and cannot meet the stringent requirements of high-end fields for the performance of the cloth. In terms of quality control, the existing technology does not accurately control the tension of the roving, and it is difficult to ensure the constant uniformity of the tension of each roving, and lacks effective real-time monitoring and closed-loop control mechanism, which cannot timely adjust the deviation in the production process, resulting in poor quality stability of the glass fiber cloth and affecting the product qualification rate. In addition, in terms of application scope, the selection of fiber cut length in the traditional technology is relatively single, the type of adhesive is limited and the solid content adjustment range is narrow, which cannot flexibly adjust the performance of the cloth according to the needs of different application scenarios, limiting the expansion of the application scope of the glass fiber cloth. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art, and provides a technology for making glass fiber cloth by directly twisting roving, which solves the problems of uneven fiber tension and inconsistent distribution in traditional production, solves the problem of inaccurate control of key parameters in the production process, and solves the problem of quality detection lag and lack of production closed-loop control.

[0005] The present application also provides a technology for making glass fiber cloth by directly twisting roving, which includes the following production steps: S1, raw material preparation and decomposition: hundreds of directly twisted roving bobbins are orderly installed on a large yarn rack according to the process requirements, the capacity of the yarn rack determines the production capacity of the production line and the maximum gram weight of the cloth that can be produced, each roving is decomposed from the bobbin and guided to the bunching plate through the guide device, and a tension control device is provided on the entire decomposition path to ensure that the tension of each roving is constant and uniform; S2, short cutting: after all the rovings are bundled, they will be accurately sent into the cutting area of the short cutting machine by high-speed airflow or conveying belt. The rovings enter between the cutting roller and the bottom roller. The cutting roller is equipped with several precisely arranged hard alloy blades. As the cutting roller rotates, the blades are pressed against the bottom roller and cut the rovings into predetermined lengths. S3, forming and laying: the cut fibers are blown into the forming chamber through the conveying pipe by the high-speed throwing roller of the short cutting machine or by using wind power to disperse the fibers. In the forming chamber, the fibers are singulated and randomly and uniformly fall by the airflow field, baffle and screen. At the bottom of the forming chamber, the endless circulating perforated stainless steel mesh belt continuously moves. The mesh belt forms a uniform negative pressure area by using a vacuum suction device to uniformly adsorb the falling fibers on the mesh belt to form a fiber mat layer. S4, applying adhesive: the mesh belt carrying the fiber mat layer moves through the adhesive application area. The prepared water-based adhesive emulsion is uniformly sprayed in mist form to both sides of the fiber web through multiple precision nozzles above and below the fiber layer. S5, drying and curing: the wet mat impregnated with the adhesive enters the drying oven with the mesh belt. The circulating hot air in the drying area evaporates most of the water. Subsequently, it enters the curing area, and the high molecules in the adhesive will be cured to firmly bond the glass fiber network together. S6, winding and packaging: the cooled cloth is continuously monitored in real time by the detection system for its unit area mass and adhesive content, and the data is fed back to the control system to realize quality closed-loop control. The cloth is wound into a roll of the required length and tightness by the winding machine. The cloth roll is taken off the production line and packaged.

[0006] According to the technical solution of the present application, the tension control device of S1 adopts a magnetic tensioner.

[0007] According to the technical solution of the present application, the cutting length of S2 is divided into 12mm, 25mm and 50mm.

[0008] According to the technical solution of the present application, the adhesive of S4 is divided into modified polyester, epoxy or polyvinyl acetate emulsion, and the solid content of S4 is in the range of 5%-15%.

[0009] According to the technical solution of the present application, the temperature of the drying area of S5 is in the range of 80-120°C, and the temperature of the curing area of S5 is in the range of 150-220°C.

[0010] According to the technical solution of the present application, the detection system of S6 adopts a ray thickness gauge.

[0011] Compared with the prior art, the technology for manufacturing glass fiber cloth by directly twisting roving has the following beneficial effects: I. The technology makes the fibers single and randomly and uniformly fall through the air flow field, baffle and screen, and forms a uniform fiber cotton layer on the mesh belt with the vacuum suction device, ensuring the consistency of the fiber distribution inside the cloth, which is beneficial to improve the mechanical properties and structural stability. II. The technology ensures the constant and uniform tension of each roving through the magnetic tensioner, and the real-time monitoring of the ray thickness gauge combined with closed-loop control can timely adjust the production deviation, effectively ensuring the quality stability of the glass fiber cloth. III. The cutting length in the technology can be selected among 12mm, 25mm and 50mm, the types of adhesive include modified polyester, epoxy or polyvinyl acetate emulsion, and the solid content can be adjusted within the range of 5%-15%, which can meet the diversified needs of different application scenarios for the performance of the cloth, and improve the application range of the technology. BRIEF DESCRIPTION OF DRAWINGS

[0012] The present application will be further described below in conjunction with the drawings and examples. Figure 1 The flowchart of the technology for manufacturing glass fiber cloth by directly twisting roving according to the present application is shown in the figure. DETAILED DESCRIPTION

[0013] This part will describe the specific embodiments of the present application in detail, and the preferred embodiments of the present application are shown in the drawings. The drawings serve to supplement the description in the text part of the specification, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application. However, it cannot be understood as a limitation on the protection scope of the present application.

[0014] Referring to Figure 1 , the technology for manufacturing glass fiber cloth by directly twisting roving according to the embodiment of the present application includes the following production steps: S1, raw material preparation and decomposition: hundreds of directly twisted roving bobbins are orderly installed on a large yarn frame according to the process requirements, and the capacity of the yarn frame determines the production capacity of the production line and the maximum gram weight of the cloth that can be produced. Each roving is decomposed from the bobbin and guided to the bunching plate through the yarn guide device. Tension control devices are provided on the entire decomposing path to ensure that the tension of each roving is constant and uniform. S2, chopping: after all the rovings are bunched, they are accurately sent into the cutting area of the chopper by high-speed airflow or conveying belt. The roving enters between the knife roll and the bottom roll, and the knife roll is provided with a plurality of precisely arranged hard alloy blades. As the knife roll rotates, the blades are pressed against the bottom roll and cut the roving into the predetermined cutting length. S3, forming and laying: the cut fibers are blown into the forming chamber by the high-speed throwing roller of the cutting machine or by wind power through the conveying pipeline to disperse the fibers; in the forming chamber, the fibers are singulated and randomly and uniformly floated by the air flow field, baffle and screen; at the bottom of the forming chamber, the endless circulating perforated stainless steel mesh belt moves, and a uniform negative pressure area is formed by the vacuum suction device to uniformly adsorb the floated fibers on the mesh belt to form a fiber cotton layer; S4, applying adhesive: the mesh belt carrying the fiber cotton layer moves and passes through the adhesive application area, and the prepared water-based adhesive emulsion is uniformly sprayed in mist form to both sides of the fiber web through multiple precision nozzles above and below the fiber layer; S5, drying and curing: the wet mat impregnated with adhesive enters the drying oven with the mesh belt, and most of the water is evaporated by the circulating hot air in the drying area, and then enters the curing area, and the high molecules in the adhesive will be cured to firmly bond the glass fiber network together; S6, winding and packaging: the cooled cloth is continuously monitored in real time by the detection system for its unit area mass and adhesive content, and the data is fed back to the control system to realize quality closed-loop control: the cloth is wound into a cloth roll of the required length and tightness by the winding machine; the cloth roll is taken off the production line and packaged.

[0015] Specifically, the tension control device of S1 adopts a magnetic tensioner, the cutting length of S2 is divided into 12mm, 25mm and 50mm, the adhesive of S4 is divided into modified polyester, epoxy or polyvinyl acetate emulsion, the solid content of S4 is in the range of 5%-15%, the temperature of the drying area of S5 is in the range of 80-120°C, the temperature of the curing area of S5 is in the range of 150-220°C, and the detection system of S6 adopts a ray thickness gauge: In addition, a twisting machine is needed in the previous process to twist the yarn, and the weft yarn twisted by the twisting machine is circular, and the woven cloth is difficult to meet the market demand in terms of toughness and flatness. Now the weft yarn without twisting after being combed by the sand frame and then conveyed to the warping machine is flat, which has higher improvement in toughness and flatness.

[0016] Working principle: hundreds of direct untwisted rovings are simultaneously unwound from the yarn can, cut into predetermined length short fibers by a precision cutting machine, then blown into the forming chamber by wind power and uniformly and randomly dispersed on the moving mesh belt to form a fluffy fiber layer; then the liquid adhesive is uniformly infiltrated into the fiber web through the spraying system, and then sent into the drying oven to evaporate the water and then high-temperature curing, so that the adhesive forms firm nodes at the fiber intersection points; finally, after cooling and online quality detection, the glass fiber cloth roll material with uniform structure and isotropy is wound.

[0017] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A technique for making a glass fiber cloth directly from a direct untwisted roving, characterized by, It comprises the following production steps: S1, raw material preparation and degumming: hundreds of direct twistless roving bobbins are orderly installed on a large yarn rack according to process requirements, the capacity of the yarn rack determines the production capacity of the production line and the maximum weight of the thin cloth that can be produced, each roving is degummed from the bobbin and guided to the bunching plate through the guide device, and a tension control device is arranged on the entire degumming path to ensure that the tension of each roving is constant and uniform; S2, chopping: after all the rovings are bunched, they are accurately sent into the cutting area of the chopper by high-speed airflow or conveying belt, the roving enters between the knife roller and the bottom roller, the knife roller is provided with a plurality of precisely arranged hard alloy blades, and as the knife roller rotates, the blades are pressed against the bottom roller and cut the roving into a predetermined cutting length; S3, forming and laying: the chopped fibers are blown into the forming chamber through the conveying pipeline by the high-speed throwing roller of the chopper or by using air force to disperse the fibers; in the forming chamber, the fibers are singulated and randomly and uniformly fall through the air flow field, the baffle and the screen; at the bottom of the forming chamber, a porous stainless steel mesh belt moves continuously, and a uniform negative pressure area is formed by a vacuum suction device to uniformly adsorb the falling fibers on the mesh belt to form a fiber mat layer; S4, applying adhesive: the mesh belt carrying the fiber mat layer moves through the adhesive application area, and above and below the fiber layer, a prepared water-based adhesive emulsion is uniformly sprayed in mist form to both sides of the fiber web through a plurality of precise nozzles; S5, drying and curing: the wet mat impregnated with the adhesive enters the drying oven with the mesh belt, and most of the water is evaporated by using the circulating hot air in the drying area, and then enters the curing area, and the high molecules in the adhesive are cured to firmly bond the glass fiber network together; S6, winding and packaging: the cooled thin cloth is continuously monitored in real time by a detection system for its unit area mass and adhesive content, and the data is fed back to the control system to realize closed-loop quality control: the thin cloth is wound into a cloth roll of the required length and tightness by a winding machine; the cloth roll is taken off from the production line and packaged.

2. A process for making a glass fiber veil directly from a direct twist roving as claimed in claim 1, wherein, The tension control device of S1 adopts a magnetic tensioner.

3. A process for making glass fibre cloth directly from direct twist roving as claimed in claim 1 wherein, The cutting length of S2 is divided into 12mm, 25mm, and 50mm.

4. A process for making glass fiber cloth directly from a direct twist roving as claimed in claim 1 wherein, The adhesive of S4 is modified polyester, epoxy or polyvinyl acetate emulsion, and the solid content of S4 is in the range of 5%-15%.

5. A process for making glass fibre cloth directly from direct twist roving as claimed in claim 1 wherein, The temperature of the drying area of S5 is in the range of 80-120°C, and the temperature of the curing area of S5 is in the range of 150-220°C.

6. A process for making glass fiber veil directly from direct twist roving as claimed in claim 1 wherein, The detection system of S6 adopts a ray thickness gauge.

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