A Short-Cut Flat Glass Fiber Molding System and Method

Abstract

This invention provides a chopped flat glass fiber forming system and method, belonging to the field of glass fiber manufacturing technology. The system includes a stencil, a water cooler, a spray cooling device, a sizing agent coating device, a bundling device, a chopped roller device, an automatic sampling and testing device, and a secondary sizing agent spraying device, arranged sequentially. The automatic sampling and testing device detects the loss on ignition and moisture content of the chopped flat fibers output from the chopped roller device, and the controller adjusts the spraying amount of the secondary sizing agent spraying device based on the detection results. By adjusting the secondary sizing agent amount by detecting the loss on ignition and moisture content of the chopped fiber product, automatic control of the LOI and MOI of the flat fiber is achieved.

Description

Technical Field

[0001] This invention belongs to the field of glass fiber manufacturing technology, and relates to a short-cut flat glass fiber forming system and method. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Flat glass fiber, as a non-circular cross-section continuous fiber, has become a key reinforcement for improving the performance of composite materials due to its significantly increased specific surface area, excellent rigidity, and bending resistance. However, compared with mature circular cross-section fibers, flat fibers face a series of technical paradoxes in terms of physical mechanisms and engineering implementation throughout the entire process of molding, surface treatment, and post-processing due to the non-centrosymmetry of their geometry. This results in low production control precision, poor yield, and insufficient level of automated testing. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a chopped flat glass fiber forming system and method, covering key technologies for fiber drawing and chopping. It also incorporates automatic detection technology, which can further improve the unit consumption and quality stability of chopped products, reduce energy consumption of tray products, lower production costs, compensate for the high production costs of existing tray products, and promote the improvement of flat glass fiber application efficiency.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: In a first aspect, a chopped flat glass fiber forming system includes a stencil, a water cooler, a spray cooling device, a sizing agent coating device, a bundling device, a chopped roller device, an automatic sampling and testing device, and a secondary sizing agent spraying device arranged in sequence. The automatic sampling and testing device is used to detect the loss on ignition and moisture content of the short-cut flat fibers output by the short-cut roller device, and adjusts the spraying amount of the sizing agent secondary spraying device according to the test results.

[0006] Secondly, a method for forming chopped flat glass fibers based on the above-mentioned chopped flat glass fiber forming system includes the following steps: Molten glass is formed by passing through a baffle plate, a water cooler, and a spray cooling device to become flat glass fiber filaments with a set cross-sectional shape, and then coated with a wetting agent by a wetting agent coating device. Flat glass fibers coated with sizing agent are fed to a chopped flat glass fiber device through a bundling device and cut into short flat glass fibers of a set length. An automatic sampling and testing device samples short-cut flat glass fibers, tests their loss on ignition and moisture content, and then a secondary wetting agent spraying device applies wetting agent; the amount of wetting agent applied by the secondary wetting agent spraying device is adjusted according to the loss on ignition and moisture content obtained from the test.

[0007] The beneficial effects of this invention are as follows: This invention addresses the challenges of controlling the shape of flat fibers and achieving uniform sizing agent application. It provides a chopped flat glass fiber forming system by adding a secondary sizing agent spraying device. The secondary sizing agent application is adjusted by detecting the loss on ignition and moisture content of the chopped fiber product, thus achieving automatic control of the LOI and MOI of the flat fibers. Furthermore, the one-step chopped fiber forming process reduces intermediate product transfer steps compared to a two-step method, improves automated monitoring and control, and ultimately achieves both quality improvement and cost reduction.

[0008] 2. In the device provided by the present invention, the main electrode and the auxiliary electrode together ensure the uniform temperature of the baffle plate, and the cooling effect is improved by the water cooler, so that the cross-sectional shape of the glass fiber output from different positions of the baffle plate is uniform, thereby improving the uniformity and shape consistency of the flat fiber. Attached Figure Description The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0009] Figure 1 This is a schematic diagram of a conventional short-cut flat glass fiber forming device provided by the present invention.

[0010] Figure 2 This is a schematic diagram of the chopped flat glass fiber forming system provided in Embodiment 1 of the present invention.

[0011] Figure 3 This is a schematic diagram of the structure of the stencil and electrode provided in Embodiment 1 of the present invention.

[0012] Figure 4 This is a schematic diagram of the water cooler provided in Embodiment 1 of the present invention.

[0013] Figure 5 This is a schematic diagram of the wetting agent coating device provided in Embodiment 1 of the present invention.

[0014] Figure 6 This is a schematic diagram of the automatic sampling and detection device provided in Embodiment 1 of the present invention.

[0015] Figure 7 This is a schematic diagram of the secondary spraying device provided in Embodiment 1 of the present invention.

[0016] Among them, 1. Fiber cake; 2. Flat glass fiber filament; 3. Chopped flat glass fiber; 4. Stencil; 5. Spray cooling device; 6. Sizing agent coating device; 61. Oil inlet; 62. Oil return outlet; 63. Oiling roller; 7. Bundling device; 8. Chopped short roller device; 9. Conveyor belt; 20. Automatic sampling and testing device; 201. Rotating mechanism; 202. Sampling container; 203. Conveying device; 204. Weighing device; 205. Drying device; 206. Burning device; 207. Fiber diameter detection device; 21. Water cooler; 211. Water inlet; 212. Water return outlet; 213. Cooling plate; 24. Stencil; 241. Main electrode; 242. First auxiliary electrode; 243. Second auxiliary electrode; 28. Chopped short roller device; 26. Secondary spraying device; 261. Pure water pipeline; 262. Wetting agent pipeline; 263. Compressed air pipeline. Detailed Implementation

[0017] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0018] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0019] Terminology Explanation: Loss on ignition (LOI) represents the percentage of the mass of the sizing agent (or organic coating) applied to the surface of glass fiber relative to the total mass of the fiber. LOI is calculated by burning the fiber at high temperatures, causing the organic matter (sizing agent) on the fiber surface to volatilize or burn, and then measuring the weight difference before and after burning.

[0020] Moisture content (MOI) represents the percentage of free water in the glass fiber precursor relative to the total mass of the fiber. It is usually measured in series with LOI; the MOI is measured first, and then the LOI is measured in a combustion chamber.

[0021] One or more embodiments of the present invention provide a chopped flat glass fiber forming system, comprising a stencil, a water cooler, a spray cooling device, a sizing agent coating device, a bundling device, a chopped roller device, an automatic sampling and testing device, and a sizing agent secondary spraying device arranged in sequence. The automatic sampling and testing device is used to detect the loss on ignition and moisture content of the short-cut flat fibers output by the short-cut roller device, and the controller adjusts the spraying amount of the sizing agent secondary spraying device according to the test results.

[0022] In the above apparatus, the stencil is used to prepare molten glass into flat glass fiber filaments with a flat cross-section; the water cooler and spray cooling device are used to shape the molten glass fiber into flat glass fiber and promote rapid cooling of the glass fiber; the sizing agent coating device is used to coat the surface of multiple flat glass fiber filaments with sizing agent; the bundling device is used to collect the flat glass fiber filaments into bundles and convey them to the stubble cutter roller device; the stubble cutter roller device is used to cut the flat glass fiber filaments into short flat glass fibers; the secondary sizing agent spraying device is used to spray sizing agent or water onto the short flat glass fibers; and the automatic sampling and testing device is used to detect the quality parameters of the short flat glass fibers and adjust the working status of other devices according to the test results to improve the quality of the final product.

[0023] Optionally, the slug is provided with a main electrode and an auxiliary electrode. The main electrode is located at the center of the edge of the slug, and the auxiliary electrode is located away from the main electrode. The temperature difference of the base plate is reduced by adjusting the auxiliary electrode. When the four corners and edges of the slug are low, the auxiliary electrode is activated to compensate. Under normal circumstances, the electrodes are parallel and symmetrically controlled to compensate for the uneven electric field lines of the main electrode. If necessary, a diagonal auxiliary electrode method can be used.

[0024] Optionally, the high-temperature glass fiber filaments are cooled to room temperature after passing through a water cooler and spray cooling. The water cooler includes multiple parallel cooling fins, and flat glass fiber filaments pass through the gaps between adjacent cooling fins. The cooling fins are equipped with capillary water flow channels to promote the water flow to carry away heat more quickly, thereby improving the cooling efficiency.

[0025] Optionally, the wetting agent coating device includes an oiling roller, through which the glass fiber filaments achieve the effect of uniformly coating the surface with wetting agent by contacting the oiling roller.

[0026] Optionally, the bundling device includes a bundling wheel for bundling multiple flat glass fiber filaments coated with sizing agent into a bundle and conveying them to the short cutter roller device; the bundling wheel only changes the conveying direction of the flat glass fiber filaments, without changing the conveying speed and tension of the flat glass fiber filaments.

[0027] Optionally, the shaving roller device includes a shaving roller and a rubber roller. The shaving roller and the rubber roller squeeze the flat glass fiber filaments between them, and the frictional force corresponding to the set pressure pulls the glass fiber bundle in the shaving rotation direction at a set speed. At the same time, the fiber bundle is shaving to the required length according to the shaving distance. Since the flat glass fiber filaments are squeezed between the shaving roller and the rubber roller and are transmitted by friction, the shaving roller device provides a set tension to the flat glass fiber filaments in the upstream device. The increase of the set speed will increase the stretching tension accordingly, thereby accelerating the formation of flat fibers from the high-temperature glass melt. The flatness (width / thickness) of the fiber decreases with the increase of speed, thereby affecting the cross-sectional size of the flat glass fiber.

[0028] Optionally, the automatic sampling and detection device includes a drying device and an ignition device. The drying device is used to detect the moisture content (MOI) and the ignition loss (LOI). It can collect raw filament samples after short cutting by the short cutting roller device at set intervals, and transfer them to the drying device to measure the MOI of the sample quickly, and then transfer them to the ignition device to measure the LOI quickly.

[0029] Optionally, the automatic sampling and detection device is also used to detect the cross-sectional dimensions and length of the chopped flat glass fibers, adjust the cutting frequency of the chopped roller device according to the cross-sectional dimensions, and adjust the blade spacing of the chopped roller device according to the length. The cutting frequency can affect the tension of the flat glass fiber filaments, thereby affecting the flatness of the glass fiber filaments. A larger blade spacing of the chopped roller device results in a longer chopped fiber, thus affecting the length of the chopped fiber and achieving stable control. When the fiber filaments are bundled and stretched by the bundling device to the chopped roller device, the conveying speed of the conveyor belt is adjusted synchronously to match the cutting frequency of the chopped roller device.

[0030] Optionally, the secondary spraying device is equipped with a pure water pipeline, a wetting agent pipeline, and a compressed air pipeline; it is used to perform secondary spraying compensation based on the detection results of the automatic sampling and detection device, spraying water to replenish when MOI is low, spraying wetting agent to replenish when LOI is low, and spraying water and wetting agent to replenish when both MOI and LOI are low, so as to promote the product index to be stable and the coating efficiency to be higher.

[0031] Optionally, the number of stencils in the chopped flat glass fiber forming system is one, the number of cutting rollers in the chopped roller device is one, and the number of water coolers and spray cooling devices is also one. That is, the flat glass fiber filaments formed by a single stencil are cooled by the same cooling device and then cut by a single cutting roller, which is a single-machine single-cutting scheme. This avoids the problem of poor product quality stability caused by a single chopped roller device cutting multiple batches of flat glass fiber filaments formed by multiple stencils in parallel.

[0032] Optionally, the short-cutting roller device includes a carbide blade and a special polyurethane rubber roller. The carbide blade replaces the ordinary carbon tool steel blade, and the special polyurethane rubber roller replaces the ordinary polyurethane rubber roller, thereby increasing the durability of the short-cutting attachment, reducing the frequency of attachment replacement (from once per week to once per quarter), and extending the service life by 10 times.

[0033] One or more embodiments of the present invention provide a method for forming chopped flat glass fibers based on the above-described chopped flat glass fiber forming system, comprising the following steps: Molten glass is formed by passing through a baffle plate, a water cooler, and a spray cooling device to become flat glass fiber filaments with a set cross-sectional shape, and then coated with a wetting agent by a wetting agent coating device. Flat glass fiber filaments coated with sizing agent are fed to a stubble cutter roller device through a bundling device and cut into short flat glass fibers of a set length. An automatic sampling and testing device samples short-cut flat glass fibers, tests their loss on ignition and moisture content, and then a secondary wetting agent spraying device applies wetting agent; the amount of wetting agent applied by the secondary wetting agent spraying device is adjusted according to the loss on ignition and moisture content obtained from the test.

[0034] In the above process, the molten glass melt undergoes sequential temperature control forming, cooling, primary coating with sizing agent, shaving, and secondary spraying with sizing agent to produce chopped flat glass fiber products. This process overcomes the problem of uneven sizing agent application due to the special cross-sectional shape, and offers high production control precision, high processing yield, and a high degree of automation in testing. Furthermore, an automatic sampling and testing device inspects the chopped flat glass fiber products, and adjustments are made to upstream equipment based on the test results. This results in higher quality chopped flat glass fibers, enabling automatic control of flatness ratio, fiber diameter, and LOI without changing tooling. Automation reduces manual intervention, significantly improves control precision, and ultimately achieves the goal of improving quality and efficiency.

[0035] Optionally, the temperature of the stencil is controlled by the main electrode and the auxiliary electrode. The main electrode is used to control the overall temperature of the stencil, and the auxiliary electrode is used to heat the edge of the stencil, so that the temperature deviation of the entire stencil bottom plate is within ±0.25℃. This ensures that the temperature control forming process is uniform at all positions of the stencil, and the cross-sectional shape of the flat glass fiber filaments obtained at all positions of the stencil is highly uniform, thereby improving the precision of production control and improving product quality.

[0036] Optionally, the automatic sampling and testing device also detects the cross-sectional dimensions and length of the chopped flat glass fibers, adjusts the cutting frequency of the chopped roller device according to the cross-sectional dimensions to adjust the tension of the flat glass fiber filaments, and adjusts the blade spacing of the chopped roller device according to the length to adjust the length of the chopped fibers, thereby improving production stability.

[0037] The present invention will be further described below with reference to specific embodiments.

[0038] Example 1 Existing short-cut flat glass fiber forming devices, such as Figure 1 As shown in (a), the device includes a perforated plate 4, a spray cooling device 5, a sizing agent coating device 6, and a bundling device 7 arranged sequentially from top to bottom. The flat glass fiber filaments 2 protruding from the perforated plate 4 are cooled by the spray cooling device 5, coated with sizing agent by the sizing agent coating device 6, and then bundled together by the bundling device 7 to form a coiled filament cake 1; subsequently... Figure 1 As shown in (b), after the flat glass fiber filament 2 is released from the filament cake 1, it is cut into chopped flat glass fibers 3 by the chopped roller device 8. The chopped flat glass fibers 3 are collected and packaged by the conveyor belt 9. The entire production process adopts a two-step method, from the filament cake 1... Figure 1 After completing the first step of the production process, unit (a) is transferred to... Figure 1 Device (b) completes the second step of the production process. Specific technical challenges are as follows.

[0039] I. Shape Control Challenges in High-Temperature Melting and Forming: Within the sub-second forming window of molten glass flowing from the nozzle and being cooled and drawn into filaments, the precise solidification of flat cross-sections faces constraints from two major physical mechanisms. One is the surface tension-driven rounding effect. According to the principle of minimum action, after molten glass flows from the flat nozzle, it tends to spontaneously shrink under the influence of surface tension, approaching a circular cross-section with the smallest surface area. The key to controlling the accuracy of the cross-sectional shape is how to suppress this "rounding" dynamic process instantaneously before fiber solidification. If the cooling rate is mismatched with the viscosity-temperature characteristics of the molten glass, even with a high-precision flat nozzle, the actual flatness of the produced fiber will significantly decrease.

[0040] II. The Interfacial Adaptation Challenges in Sizing: The significantly increased specific surface area and curvature variations of flat fibers place stringent demands on the uniformity of sizing agent coating. Driven by surface tension gradients, the sizing agent film tends to flow from high-pressure areas with small radii of curvature (convex surfaces at fiber ends) to low-pressure areas with large radii of curvature (flat or concave surfaces at the fiber waist), resulting in severely uneven circumferential distribution of the coating. This leads to uneven circumferential distribution of the sizing agent and interfacial defects. This phenomenon of "edge accumulation and thin sizing at the edges" directly deteriorates the interfacial bonding strength between the fiber and the resin matrix, becoming a potential weak point in the macroscopic properties of the composite material.

[0041] Third, interface damage and equipment wear in the slitting process differ from the point or line contact of round fibers. When the edges of flat fibers come into contact with the cutting blade, a localized high-stress concentration cutting effect occurs. This high-intensity micro-cutting action leads to a tool wear rate much higher than when cutting round fibers, significantly increasing the frequency of equipment downtime for tool replacement and severely restricting the production efficiency and continuity of the slitting process. On the other hand, when flat fibers are subjected to shear stress, the stress distribution is extremely uneven due to the asymmetry of their cross-sectional moment of inertia. This makes the cut end face prone to irregular chipping, burrs, or micro-cracks. These micro-defects, as stress concentration sources, will induce early failure in subsequent composite material molding, leading to increased dispersion or a decrease in the absolute value of the mechanical properties of the final product.

[0042] Fourth, there are bottlenecks in process control detection technology. Traditional methods rely on downtime sampling, sample preparation, and offline microscopic observation, which result in significant detection lag and an inability to provide real-time feedback control, leading to a "blind adjustment" state in the production process. Furthermore, the diameter and roundness indicators of round fibers are no longer applicable to flat fibers. Although the industry currently defines parameters such as "flatness ratio" and "axial ratio," how to transform these offline characterization parameters into real-time control variables in online production and fill the gap in dedicated testing equipment and standards systems is a fundamental problem that the industry urgently needs to solve.

[0043] The entire technical solution has shortcomings such as complex production process, poor process control stability, and low degree of process automation. When it is applied to the production of glass fiber with fiber flatness (width / thickness) in the range of 1.5-2.5, the CV value of fiber diameter is 3~6%; the unit energy consumption is (508 kg standard coal / ton), and the production line speed is about 1.5 m / s.

[0044] This embodiment provides a short-cut flat glass fiber molding system, such as Figure 2 As shown, the device includes a stencil 24, a water cooler 21, a spray cooling device 5, a sizing agent coating device 6, a bundling device 7, a sizing roller device 28, an automatic sampling and testing device 20, and a secondary sizing agent spraying device 26 arranged sequentially along the glass fiber / chopped fiber conveying direction. The automatic sampling and testing device 20 is used to detect the loss on ignition and moisture content of the chopped flat glass fibers 3 output from the chopped roller device 28, and adjusts the spraying amount of the secondary sizing agent spraying device 26 according to the test results.

[0045] 24 sprue plates Figure 3As shown, a main electrode 241, a first auxiliary electrode 242, and a second auxiliary electrode 243 are provided. A plurality of nozzles conforming to the shape of flat glass fibers are provided on the sprue plate 24 to form flat glass fibers with a predetermined cross-sectional shape from the molten glass. The sprue plate 24 is rectangular, including a long side and a short side. The main electrode 241 is located at the center of the short side of the sprue plate. The first auxiliary electrode 242 and the second auxiliary electrode 243 are respectively located on the short side away from the main electrode 241. Specifically, the first auxiliary electrode 242 and the second auxiliary electrode 243 are respectively located at the two ends of the short side of the sprue plate away from the main electrode 241. The electrodes are arranged parallel and symmetrically, that is, the two first auxiliary electrodes 242 are respectively close to the two ends of the same long side, and the two second auxiliary electrodes 243 are respectively close to the two ends of the other long side. When low temperatures occur at the four corners and edges of the sprue plate 24, the auxiliary electrodes are activated to compensate for the temperature.

[0046] The sprue plate 24 is provided with multiple nozzles that conform to the shape of the flat glass fiber, such as... Figure 3 As shown; Figure 4 As shown, the water cooler 21 is installed below the sprue plate 24 and close to the sprue plate 24 to quickly cool the flat glass fiber filaments 2 coming out of the sprue plate 24 nozzle. The water cooler 21 consists of an inlet 211, an outlet 212, and cooling plates 213. The inlet 211 and outlet 212 are used to transport external cooling water into the water cooler 21 and return the water. The water cooler 21 is provided with multiple parallel cooling plates 213. During the distribution and circulation process, the cooling water flows through multiple cooling plates 213. The multiple cooling plates 213 are arranged in parallel, and the gap between adjacent cooling plates 213 is parallel to the direction of the flat glass fiber filament 2, so that the flat glass fiber filament 2 passes through the gap between adjacent cooling plates 213. Each cooling plate 213 is provided with a capillary water flow channel, which promotes the water flow to carry away the heat transferred from the flat glass fiber filament 2 to the cooling plate 213 more quickly, thereby achieving the effect of improving cooling efficiency, realizing the accurate configuration of cooling rate and glass melt viscosity-temperature characteristics, and preventing the cross-sectional rounding effect driven by surface tension.

[0047] The sizing agent coating device 6 is used to apply a sizing agent to the cooled flat glass fiber filaments for the first time; its structure is as follows: Figure 5 As shown, the sizing agent flows into the sizing agent coating device 6 from the oil inlet 61. The oiling roller 63 carries the sizing agent. During the process of the flat glass fiber contacting the oiling roller 63, the sizing agent is evenly coated on the surface of the flat glass fiber filament 2. Excess sizing agent flows back to the sizing agent pipe from the oil return port 62, completing the first sizing agent coating of the flat glass fiber filament.

[0048] The bundling device 7 includes a bundling wheel for bundling multiple flat glass fiber filaments 2 coated with sizing agent into a bundle, which is then immediately cut into short fibers by the chopped fiber cutter roller device 28.

[0049] The short cutting roller device 28 includes a cutting roller and a rubber roller that press against each other. The flat glass fiber filament 2 is pressed between the cutting roller and the rubber roller. The cutting roller and the rubber roller press against each other and rotate in a set direction at a set speed, so that the cutting roller and the rubber roller pull the glass fiber bundle in the rotation direction at a set speed with a set pressure. The fiber bundle is short cut to a set length according to the blade spacing between adjacent blades on the cutting roller.

[0050] In this embodiment, a carbide blade is used instead of a regular carbon tool steel blade, and a polycaprolactone-type polyurethane rubber roller is used instead of a regular polyurethane rubber roller. This increases the durability of the stubbed glass fiber accessory, reduces the frequency of accessory replacement (from once per week to once per quarter), and extends its service life by 10 times. During the cutting process, the cutting frequency of the stubbed glass fiber roller device 28 is adjusted according to the cross-sectional size of the glass fiber, and the blade spacing of the stubbed glass fiber roller device 28 is adjusted according to the length. Since the flat glass fiber filaments 2 are squeezed between the blade roller and the rubber roller and are transmitted by friction, a significant increase in the cutting frequency leads to a significant increase in the transmission speed, which in turn increases the friction applied to the fiber filaments accordingly. The cutting frequency of the stubble cutter roller device 28 affects the tension of the flat glass fiber filament 2 in the upstream system. A higher cutting frequency results in higher tension, and a lower cutting frequency results in lower tension, thus affecting the flatness of the flat glass fiber filament 2. A larger blade spacing of the stubble cutter roller device 28 results in longer length, and a smaller blade spacing results in shorter length, thus affecting the length of the stubble flat glass fiber 3. When the flat glass fiber filament 2 is bundled and stretched by the bundling device 7 to the stubble cutter roller device 28, the conveying speed of the conveyor belt 9 is adjusted synchronously to match the cutting frequency of the stubble cutter roller device 28, so that the stubble fiber is spread on the conveyor belt 9 at a set density.

[0051] like Figure 6 As shown, the automatic sampling and testing device 20 includes a sampling container 202, a weighing device 204, a drying device 205, a calcination device 206, and a fiber diameter detection device 207 arranged sequentially. The weighing device 204 is used to weigh the sampled fibers. In conjunction with the drying device 205, it can be used to detect the moisture content (MOI). In conjunction with the calcination device 206, it can be used to detect the loss on ignition (LOI). The sampling container 202 is connected to the rotating mechanism 201 and can rotate around the rotating mechanism 201. During rotation, the sampling container 202... Figure 2The chopped flat glass fiber 3 moves between its falling position and the conveying device 203 of the automatic sampling and detection device 20, and can reach the falling position of the chopped flat glass fiber 3 at set intervals. It collects the chopped fiber sample after being chopped by the chopped roller device 28, loads it into the sampling container 202 and sends it to the conveying device 203. Then, it passes through the drying device 205 (small infrared dryer) along the conveying device 203 to measure the MOI of the rapid sample. After passing through the burning device 206 (burning house) for burning, the LOI is measured quickly. Then, the fiber diameter is detected by the fiber diameter detection device 207 (TW-FDM-A) to quickly detect the fiber shape, and obtain the cross-sectional size and length of the chopped flat glass fiber 3.

[0052] The automatic sampling and detection device 20 is connected to the short-cutting roller device 28 via a control device. It adjusts the cutting frequency of the short-cutting roller device 28 based on the detected cross-sectional dimensions and adjusts the blade spacing based on the detected length. The cutting frequency affects the tension of the flat glass fiber filament 2 in the upstream system; a higher cutting frequency results in higher tension, and a lower cutting frequency results in lower tension, thus affecting the flatness of the flat glass fiber filament 2. A larger blade spacing of the short-cutting roller device 28 results in a longer length, and a smaller blade spacing results in a shorter length, thus affecting the length of the short-cut flat glass fiber 3 and achieving stable shape control. When adjusting the process parameters of the short-cutting roller device 28, the conveying speed of the conveyor belt 9 is simultaneously adjusted to match the cutting frequency of the short-cutting roller device 28.

[0053] The secondary spraying device 26 is a two-fluid spraying device, such as... Figure 7 As shown, a pure water pipeline 261 and an impregnating agent pipeline 262 are provided, as well as a compressed air pipeline 263. Each pipeline is equipped with a corresponding flow regulating valve. The pure water transported by the pure water pipeline 261 is mixed with the impregnating agent transported by the impregnating agent pipeline 262, and then further mixed with the gas transported by the compressed air pipeline 263. The mixture is then sprayed through the nozzle 264 to achieve an atomized spraying effect. The secondary spraying device 26 is used to perform secondary spraying compensation on the chopped fibers on the conveyor belt 9 based on the detection results of the automatic sampling and detection device 20. When the LOI is low, spray water replenishment is achieved through compressed air pipeline 263 and pure water pipeline 261. When the MOI is low, spray LOI replenishment is achieved through compressed air pipeline 263 and wetting agent pipeline 262. When both MOI and LOI are low, MOI and LOI are replenished through pure water pipeline 261, wetting agent pipeline 262 and compressed air pipeline 263. After the short fiber products are cut, spray compensation is added to prevent the MOI and LOI of the short fiber products from fluctuating after cutting, so as to promote the product indicators to be stable and the coating efficiency is higher.

[0054] like Figure 2As shown, the number of the stencil 24 and the spray cooling device 5 in the chopped flat glass fiber forming system is one, and the chopped roller device 28 includes a set of cutting roller devices; it is a single machine single cutting process, which avoids the problem of poor product quality stability caused by the multi-machine control difference mixed cutting scheme where one chopped roller device 28 cuts multiple batches of flat glass fiber filaments at the same time.

[0055] The method for forming short-cut flat glass fibers based on the apparatus of this embodiment, such as Figure 2 As shown, the process includes the following: S1. Molten glass liquid is formed by passing through a baffle plate 24, a water cooler 21 and a spray cooling device 5 to form flat glass fiber filaments 2 with a set cross-sectional shape, and is coated with a wetting agent by a wetting agent coating device 6. S2. Flat glass fiber filaments 2 coated with sizing agent are conveyed to short cutting roller device 28 through bundle device 7 and cut into short flat glass fibers 3 of a set length. S3. The automatic sampling and testing device 20 samples the chopped flat glass fiber 3 and tests its loss on ignition and moisture content. Based on the test results of loss on ignition and moisture content, the wetting agent secondary spraying device 26 performs secondary spraying compensation. The chopped flat glass fiber 3 that has completed secondary spraying is conveyed to the product packaging process by the conveyor belt 9.

[0056] In S1, the temperature of the stencil 24 is controlled by the main electrode 241, the first auxiliary electrode 242, and the second auxiliary electrode 243. The main electrode 241 is used to control the overall temperature of the stencil 24, and the auxiliary electrode is used to heat the edge of the stencil 24, so that the temperature of the entire stencil 24 is maintained within ±0.1℃.

[0057] In S3, the automatic sampling and detection device 20 also detects the cross-sectional dimensions and length of the chopped flat glass fiber 3, adjusts the cutting frequency of the chopped roller device 28 according to the cross-sectional dimensions to adjust the tension of the flat glass fiber filament 2 in the upstream device, and adjusts the blade spacing of the chopped roller device 28 according to the length to adjust the length of the chopped fiber 3.

[0058] The chopped flat glass fiber forming method provided in this embodiment, compared with the previous method, can be applied to the production of glass fibers with a fiber flatness (width / thickness) in the range of 2.5-5.0, and the CV value of the fiber diameter is <3%. Moreover, the unit energy consumption is reduced by 18%, and the production line speed is increased to more than 3m / s.

[0059] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A chopped flat glass fiber forming system, characterized in that, It includes a stencil, a water cooler, a spray cooling device, a wetting agent coating device, a clustering device, a short cutting roller device, an automatic sampling and testing device, and a secondary wetting agent spraying device arranged in sequence. The automatic sampling and testing device is used to detect the loss on ignition and moisture content of the short-cut flat fibers output by the short-cut roller device, and adjusts the spraying amount of the sizing agent secondary spraying device according to the test results.

2. The chopped flat glass fiber forming system as described in claim 1, characterized in that, The sprue plate is provided with a main electrode and an auxiliary electrode. The main electrode is located at the center of the edge of the sprue plate, and the auxiliary electrode is located away from the main electrode. The sprue plate is provided with a plurality of nozzles that conform to the shape of flat glass fibers.

3. The chopped flat glass fiber forming system as described in claim 1, characterized in that, The water cooler consists of multiple parallel cooling fins, which are designed with capillary water flow channels.

4. The chopped flat glass fiber forming system as described in claim 1, characterized in that, The bundling device includes a bundling wheel for bundling multiple flat glass fibers coated with sizing agent into a single bundle and conveying them to a short cutter roller device.

5. The chopped flat glass fiber forming system as described in claim 1, characterized in that, The automatic sampling and detection device includes a drying device and an ablaze device. The drying device is used to detect loss on ablaze and the drying device is used to detect moisture content.

6. The chopped flat glass fiber forming system as described in claim 1, characterized in that, The secondary spraying device is equipped with pure water pipeline, wetting agent pipeline and compressed air pipeline; it is used to perform secondary spraying compensation based on the detection results of the automatic sampling and detection device.

7. The chopped flat glass fiber forming system as described in claim 1, characterized in that, The automatic sampling and detection device is also used to detect the cross-sectional dimensions and length of the chopped flat glass fibers, adjust the cutting frequency of the chopped roller device according to the cross-sectional dimensions, and adjust the blade spacing of the chopped roller device according to the length.

8. A method for forming chopped flat glass fibers based on the chopped flat glass fiber forming system as described in any one of claims 1-7, characterized in that, Includes the following processes: Molten glass is formed by passing through a baffle plate, a water cooler, and a spray cooling device to become flat glass fiber filaments with a set cross-sectional shape, and then coated with a wetting agent by a wetting agent coating device. Flat glass fibers coated with sizing agent are fed to a chopped flat glass fiber device through a bundling device and cut into short flat glass fibers of a set length. An automatic sampling and testing device samples short-cut flat glass fibers, tests their loss on ignition and moisture content, and then a secondary wetting agent spraying device applies wetting agent; the amount of wetting agent applied by the secondary wetting agent spraying device is adjusted according to the loss on ignition and moisture content obtained from the test.

9. The method for forming short-cut flat glass fibers as described in claim 8, characterized in that, The temperature of the stencil is controlled by the main electrode and the auxiliary electrode. The main electrode is used to control the overall temperature of the stencil, while the auxiliary electrode is used to heat the edge of the stencil.

10. The method for forming short-cut flat glass fibers as described in claim 8, characterized in that, The automatic sampling and testing device is also used to detect the cross-sectional dimensions and length of chopped flat glass fibers, adjust the cutting frequency of the chopped roller device according to the cross-sectional dimensions, and adjust the blade spacing of the chopped roller according to the length.

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