Fogdrop constraint sedimentation type sizing system and sizing method for glass fiber wet felt production

Abstract

The invention discloses a fogdrop constraint settling type sizing system and method for glass fiber wet felt production, and the sizing system comprises a material storage device, an auxiliary material storage tank, a fogdrop constraint settling type sizing device, a fogdrop constraint settling type sizing device and a fogdrop constraint settling type sizing device, the feeding device comprises a control valve and a metering pump; a fogdrop restraining device; a binder atomizing device; according to the present invention, the fog drop constraint sedimentation type glue applying system comprises a set of fog drop constraint sedimentation type glue applying module composed of a set of filter devices, the fog drop constraint sedimentation type glue applying system can comprise one or more than one set of fog drop constraint sedimentation type glue applying modules according to requirements, and the function modules can be added or reduced according to production requirements, or the functions of each module can be customized according to requirements. According to the system, the glass fiber binder can be efficiently and uniformly coated in the wet-process felt production process, and meanwhile, the production cost and the environmental pollution are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of the production of glass fiber wet felts, and particularly relates to a droplet-constrained sedimentation sizing system and a sizing method for the production of glass fiber wet felts. Background Art

[0002] The information disclosed in the background art of the present invention is only intended to increase the understanding of the overall background of the present invention, and does not necessarily be regarded as an admission or imply in any form that this information constitutes the prior art already known to those of ordinary skill in the art.

[0003] The glass fiber wet felt uses short cut glass fibers as the main raw material, is mixed and stirred with white water to form a slurry, and the product is obtained after papermaking, dehydration, sizing, and drying processes. After the glass fiber papermaking, the bonding force between the fibers is insufficient, and sizing treatment is usually required to endow the product with properties such as bonding strength. The traditional sizing of glass fiber wet felts uses a sizing curtain sizing process. The glass fiber wet felt will be excessively infiltrated with the binder, and the excessive binder is sucked away and enters the binder circulation system. This process equipment consists of a glass fiber binder storage system, a binder circulation system, and a suction and aerosol separation system, and has the following deficiencies: First, the traditional glass fiber wet felt sizing system has a closed circulation. During the production process of the wet felt, white water will be brought into the glass fiber binder circulation system, and the performance of the binder in the circulation system will decline after long-term operation; Second, to ensure the normal operation of the circulation system, the viscosity of the glass fiber binder cannot be too high. Excessive binder viscosity will cause poor circulation in the binder circulation system, and holes will appear in the sizing curtain, resulting in the problem of no glue in some areas of the glass fiber wet felt product. Therefore, the improvement of the binder solid content is restricted. A lower solid content means a high water content in the binder, resulting in too high a moisture content of the wet felt when entering the drying section, and thus causing energy consumption waste; Third, the self-drying property and adhesiveness of the glass fiber binder will cause blockage of the pipelines of the suction and aerosol separation system, and regular shutdown for cleaning and maintenance is required, resulting in waste of man-hours and a decrease in production efficiency. Moreover, the aerosol cannot be completely separated, and part of the binder will be discharged into the atmosphere in the form of aerosol, causing pollution.

[0004] The traditional sizing process of glass fiber wet felts has problems such as high energy consumption, poor binder stability, and low production efficiency, and it is difficult to meet the production requirements of high efficiency and environmental protection in modern industry. Therefore, developing a new type of sizing process for wet felts that can improve production efficiency and product quality, reduce production costs, and meet environmental protection requirements is an urgent problem to be solved in the current glass fiber industry. Summary of the Invention

[0005] To address the deficiencies of the prior art, the objective of the present invention is to provide a droplet-constrained sedimentation sizing system and sizing method for the production of glass fiber wet felts. Compared with the closed-loop of traditional systems, this system is designed as an open system, eliminating the binder circulation step. This system can achieve efficient and uniform coating of the glass fiber binder during the production of wet felts, while reducing production costs and environmental pollution.

[0006] To achieve the above objective, the present invention provides the following technical solutions:

[0007] As a first aspect of the present invention, it lies in providing a droplet-constrained sedimentation sizing system for the production of glass fiber wet felts, including:

[0008] A storage device for providing binder materials;

[0009] A droplet constraint device for atomizing the binder and spreading the binder on the wet felt;

[0010] The droplet constraint device includes a spray sealing chamber, an atomizing device, a negative pressure device, and a wet felt conveying device. The atomizing device is located in the spray sealing chamber and is connected to the storage device outside the spray sealing chamber; several slits are provided at the top of the spray sealing chamber; the wet felt conveying device and the negative pressure device are sequentially arranged below the spray sealing chamber. The negative pressure device generates negative pressure, and the slits above the atomizing device suck air from the outside due to the negative pressure, forming a downward air flow field in the spray sealing chamber to spread the materials in the atomizing device on the wet felt on the wet felt conveying device.

[0011] In an embodiment of the present invention, the negative pressure device includes a negative pressure box, and the negative pressure box is connected to an external suction fan through a suction pipeline.

[0012] In an embodiment of the present invention, the wet felt conveying device includes a mesh belt and a mesh belt support frame strip. The mesh belt support frame strip is arranged at the bottom of the spray sealing chamber and is a number of mutually parallel strips. A gap is provided between adjacent mesh belt support frame strips to form an air flow channel between the top plate slits and the mesh belt support frame strip.

[0013] In an embodiment of the present invention, a partition board for separating the sizing module is arranged in the spray sealing chamber, partitioning the inside of the spray sealing chamber into several modules. As a typical embodiment, in each module, there are two slits, respectively located on both sides of the atomizing device.

[0014] In an embodiment of the present invention, the spray sealing chamber is five-sided sealed, with an external sealing chamber board made of PVC transparent board; a spray sealing chamber frame is arranged inside the spray sealing chamber board, and its material is aluminum profile or angle steel.

[0015] In an embodiment of the present invention, it includes one set or more of constrained sedimentation sizing modules, and each of the constrained sedimentation sizing modules sprays at least one of wetting and leveling agents, binders, or additives into the spray sealing chamber.

[0016] In the sizing system, the storage device includes a main material storage tank and an auxiliary material storage tank.

[0017] In an embodiment of the present invention, the sizing system further includes a feeding device for controlling the supply of binder materials, which includes a control valve and a metering pump.

[0018] The sizing system further includes a filtering device.

[0019] According to requirements, this droplet constrained sedimentation sizing system may include one set or more of droplet constrained sedimentation sizing modules. The sizing module includes a storage device, a feeding device, a filtering device, and a droplet constraint device; the functional modules can be increased or decreased according to production requirements, or the functions of each module can be customized according to requirements.

[0020] In some embodiments of the present invention, the storage device for the binder of glass fiber wet felts consists of a main material storage tank, an auxiliary material storage tank, and the matching connecting pipelines; the main material storage tank is designed with a relatively large capacity for storing the main materials in the formula; the auxiliary material storage tank is used for storing functional additives such as wetting agents or coupling agents.

[0021] In some embodiments of the present invention, the feeding device is the control unit 3; the control unit 3 realizes the control of whether to feed the storage tank and the feeding amount. Whether to feed is controlled by a solenoid valve or a pneumatic valve, which is used to control the feeding state of the main material storage tank and the auxiliary material storage tank; a metering pump such as a plunger pump or a gear pump is used to accurately control the feeding amount of the material.

[0022] In some embodiments of the present invention, the filtering device consists of a control valve and a filter.

[0023] In some embodiments of the present invention, the atomization device needs to adopt methods such as pressure atomization, Venturi atomization, or ultrasonic atomization according to the material characteristics, and its purpose is to convert the material into fine droplets and evenly spread them on the target object supported by the mesh belt.

[0024] In some embodiments of the present invention, the droplet constraint device adopts an air curtain constraint method, and its purpose is to control the movement direction of the droplets and improve the material utilization rate.

[0025] As the second aspect of the present invention, it lies in providing a droplet constrained sedimentation sizing method for the production of glass fiber wet felts, including a multi-module collaborative sizing process:

[0026] In Module 1: The wetting agent in the auxiliary material storage tank is quantitatively transported by the control unit. After being atomized by the atomizing device, it uniformly settles on the surface of the wet felt under the constraint of the air curtain;

[0027] In Module 2: Binder A in the main material storage tank is mixed with the coupling agent in the auxiliary material storage tank in proportion, and the flow rate is precisely controlled by the metering pump;

[0028] In Module 3: Binder B in the main material storage tank is used independently. After being atomized, it reacts with the glue solution of the module on the surface of the wet felt;

[0029] In Module 4: The functional additives in the auxiliary material storage tank are sprayed as needed.

[0030] As the third aspect of the present invention, it lies in providing a preparation method for glass fiber wet felts, including the following steps:

[0031] S1, Preparation of the wet felt;

[0032] S2, Sizing. Place the wet felt prepared in step S1 on the mesh belt and enter the sizing system;

[0033] The binder in the storage tank is pumped to the binder atomizing device through the pipeline by the metering pump. After atomization, the binder droplets settle on the wet felt under the constraint of the air curtain to complete sizing.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] (1) The present invention provides a droplet-constrained sedimentation sizing system and sizing method for the production of glass fiber wet felts. This system can achieve efficient and uniform coating of glass fiber binders during the production of wet felts, while reducing production costs and environmental pollution.

[0036] (2) In some embodiments of the present invention, according to the material characteristics, the atomizing device adopts methods such as pressure atomization, Venturi atomization or ultrasonic atomization. The purpose is to convert the material into fine droplets and uniformly spread them on the target object supported by the mesh belt.

[0037] (3) In some embodiments of the present invention, the droplet constraint device adopts the air curtain constraint method. The purpose is to control the movement direction of the droplets and improve the material utilization rate. Description of the Drawings

[0038] Figure 1 It is a schematic structural diagram of a specific embodiment of the droplet-constrained sedimentation sizing system for glass fiber wet felts of the present invention;

[0039] Figure 2 It is a model diagram of the droplet-constrained sedimentation sizing part in a specific embodiment of the droplet-constrained sedimentation sizing system for glass fiber wet felts of the present invention;

[0040] Figure 3 For Figure 2 sectional view A-A in the figure;

[0041] Among them, 1 - main material storage tank; 2 - auxiliary material storage tank; 3 - control unit; 4 - filter; 5 - droplet restraint device; 6 - atomization device; 7 - mesh belt; 8 - negative pressure box; 9 - slit; 10 - mesh belt support frame strip; 11 - spray sealing chamber; 12 - air flow field; 13 - mesh belt and wet felt; 14 - base; 15 - partition board; 1101 - glass outer shell. Specific implementation mode

[0042] It should be noted that the following detailed description is exemplary and is intended to provide further illustration of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] Embodiment 1, a droplet restraint sedimentation sizing system for the production of glass fiber wet felts

[0044] As Figure 1 shown, it is a specific implementation mode of the novel glass fiber wet felt restraint sedimentation sizing system (hereinafter referred to as the sizing system) of the present invention. As a supply and transmission system for the binder of the wet felt, it is used to provide the binder to the wet felt to be sized.

[0045] The sizing system includes a main material storage tank 1 and an auxiliary material storage tank 2 for accommodating materials; a control unit 3 for controlling material transportation; a filter 4 for filtering materials; a droplet restraint device 5 for restraining the movement path of droplets; and an atomization device 6 for atomizing materials.

[0046] The main material storage tank 1 and the auxiliary material storage tank 2 are respectively connected to the filter 4 through pipelines. The filter 4 is connected to the atomization device 6 through a pipeline, and a control valve is provided on the pipeline connecting the filter and the atomization device 6; the control unit 3 includes a control valve and a metering pump, and control valves and metering pumps are respectively provided on the pipelines connecting the main material storage tank 1 and the auxiliary material storage tank 2 to the filter 4. The main material storage tank 1 is designed with a large capacity for storing the main materials in the formula; the auxiliary material storage tank 2 is used for storing functional additives such as wetting agents or coupling agents. As a typical embodiment, the control valve is controlled by an electromagnetic valve or a pneumatic valve to control the feeding state of the main material storage tank 1 and the auxiliary material storage tank 2; a metering pump such as a piston pump or a gear pump is used to accurately control the feeding amount of materials.

[0047] In some embodiments of the present invention, the main material storage tank 1 and the auxiliary material storage tank 2 are relatively independent; the main material storage tank 1 can be used in cooperation with the auxiliary material storage tank 2, facilitating the mixing of the materials in the two storage tanks in proportion; or the main material storage tank 1 and the auxiliary material storage tank 2 can be used separately.

[0048] In some embodiments of the present invention, discharge ports are provided at the bottom of the main material storage tank 1 and the auxiliary material storage tank 2, facilitating the extraction, replenishment of materials and the flushing of the tank body.

[0049] In some embodiments of the present invention, the filtering device 4 is composed of a control valve and a filter.

[0050] In some embodiments of the present invention, the atomizing device 6 needs to adopt pressure atomization, Venturi atomization or ultrasonic atomization and other methods according to the material characteristics, aiming to convert the material into fine droplets and evenly sprinkle them on the target object supported by the mesh belt 7.

[0051] In some embodiments of the present invention, the droplet confinement device 5 adopts an air curtain confinement method, aiming to control the movement direction of the droplets and improve the material utilization rate.

[0052] As Figure 2 and Figure 3 shown, the droplet confinement device 5 structurally includes a negative pressure box 8, a mesh belt support frame strip plate 10 and a spray sealing chamber 11, and there are several slits 9 at the top of the spray sealing chamber 11. The atomizing device 6 is located in the spray sealing chamber 11 and is connected to the external filter 4. Its working principle is that the negative pressure box 8 generates negative pressure, and the negative pressure is transmitted to the spray sealing chamber 11 through the mesh belt support frame strip plate 10. The slits 9 on both sides above the atomizing device 6 suck in air from the outside due to the negative pressure, forming an air flow field 12 flowing towards the negative pressure box 8. The negative pressure box is connected to an external suction fan through a suction pipeline.

[0053] The upper surface of the mesh belt support frame strip plate 10 is provided with a mesh belt 7 or other wet felt conveying devices. The function of the mesh belt 7 is to support the wet felt to be sized and is driven by a driving roller driven by a motor; the mesh belt support frame strip plate 10 is used to support the mesh belt 7.

[0054] The spray sealing chamber 11 is sealed on five sides. The external part is a sealing chamber plate, and the material can be a hard material such as metal or fiberglass. As a typical embodiment, it is a PVC transparent plate; inside the spray sealing chamber plate, a spray sealing chamber frame 1101 is provided, and its material is a frame-making material such as aluminum profile or angle steel.

[0055] The slit 9 is provided on the top plate of the spray sealing chamber and is used to form an air curtain; the belt support frame strip plate 10 is arranged at the bottom of the spray sealing chamber 11 and is a number of mutually parallel strips, and gaps are arranged between adjacent belt support frame strip plates 10; the top plate slit 9 and the belt support frame strip plate 10 form an air flow channel. The negative pressure box 8 is arranged at the bottom of the belt support frame strip plate 10 and is connected to the support frame strip plate 10 by countersunk holes, and the connection positions can be on both sides in the machine running direction.

[0056] A partition board 15 for separating the sizing module is arranged in the spray sealing chamber 11, and the material can be a hard material such as metal or fiberglass, and it is fixed on the spray sealing chamber frame. As a typical embodiment, as Figure 3 shown, the inside of the spray sealing chamber 11 is partitioned into four modules. As a typical embodiment, in each module, there are two slits, which are located on both sides of the atomizing device.

[0057] The binder granules formed by the atomizing device 6 are evenly settled on the object supported by the mesh belt 7 under the guidance of the air flow field 12.

[0058] The base 14 is used to fix the negative pressure box 8 and the spray sealing chamber 11, and its fixing method is lap joint and angle code connection.

[0059] According to needs, this constrained sedimentation sizing system can include one set or more of constrained sedimentation sizing modules.

[0060] Taking the wet felt sizing action realized by using four sets of constrained sedimentation sizing modules as an example, the sizing control of the wet felt binder is carried out by the above sizing system through the following method.

[0061] Module 1 is used to spray the wetting and leveling agent on the wet felt, modules 2 and 3 are used to spray the binder on the wet felt, and module 4 is used to spray the functional additive on the wet felt. Each sizing module includes an external main material storage tank 1, an auxiliary material storage tank 2, a control unit 3, a filter 4 and the space inside the droplet constraint device 5. The operation processes of each module are described as follows:

[0062] 1. Operation of Module 1:

[0063] Material transportation and atomization: When the sizing system operates normally, the wetting agent stored in the main material storage tank 1 or the auxiliary material storage tank 2 (specifically using the main material storage tank 1 or the auxiliary material storage tank 2 is determined by the formula and actual production conditions) is controlled by the control unit 3 for the flow rate, flows through the filter 4 and then flows to the atomizing device 6 to complete atomization.

[0064] Establishment of negative pressure and formation of the droplet - constraining air curtain: The negative - pressure box 8 has established negative pressure through the suction fan. The negative pressure is transmitted to the spraying and sealing chamber 11 surrounded by the PVC transparent plate and the aluminum alloy frame through the mesh - belt support frame strip plate 10. Outdoor air flows into the spraying and sealing chamber 11 through the slit 9 at the upper part of the spraying and sealing chamber 11 under the action of negative pressure, and an air flow field 12 for constraining droplets is formed on both sides of the atomizing device 6.

[0065] Movement of droplets in the spraying and sealing chamber 11 and attachment to the target object: The wetting agent atomized by the atomizer 9 flows towards the wet - felt green body supported by the mesh belt 7 under the constraint and guidance of the air flow field 12 in the spraying and sealing chamber 11, completing the attachment of the wetting agent to the wet felt. The mesh belt 7, supported by the mesh - belt support frame strip plate 10, carries the wet - felt green body and moves it to the next sizing module.

[0066] 2. Operation of Module 2 and Module 3:

[0067] Module 2 and Module 3 are used to spray the binder on the wet felt. The designed binder is a two - component binder. Module 2 is used to spray binder component A and the supporting coupling agent, and Module 3 is used to spray binder component B. Its working principle is basically similar to that of Module 1. Here, the implementation process of mixing and spraying the two materials in Module 2 in a certain proportion is described in detail: The main - material storage tank 1 is used to store binder component A, and the auxiliary - material storage tank 2 is used to store the coupling agent. When the sizing system operates normally, binder component A and the coupling agent in the main - material storage tank 1 and the auxiliary - material storage tank 2 flow out under the control of the control unit 3 according to the set flow rate, realizing the designed formula ratio and feeding quantification.

[0068] 3. The operation mode of Module 4 is the same as that of Module 1, so it will not be elaborated here.

[0069] The wet - felt green body that has completed the sizing action is peeled off from the mesh belt 7 and moves to the next process.

[0070] The ratio between different materials in the formula is realized by the control module 3 controlling the flow rates of different materials, and the sizing amount of the wet felt is realized by the coordinated control of the production speed and the control module 3.

[0071] The binder is carried away by the wet felt. By controlling the air volume, no liquid enters the negative - pressure box. A small amount of liquid entering in the form of aerogel will adhere to the box wall, and the binder on the box wall can be removed by regular cleaning.

[0072] Example 2, A droplet - constraining sedimentation - type sizing method for the production of glass - fiber wet felts

[0073] This example provides an operation method based on a droplet - constraining sedimentation - type sizing system, and the specific steps are as follows:

[0074] I. Equipment preparation and parameter configuration

[0075] 1. System inspection:

[0076] ① Confirm that the main material storage tank (1) and the auxiliary material storage tank (2) are respectively loaded with the preset main binder (such as two-component glue A) and auxiliary materials (such as coupling agent or wetting agent).

[0077] ② Check the solenoid valve, metering pump and pipeline connection status of the control unit (3) to ensure no leakage; verify the cleanliness of the filter (4) and the atomization effect (pressure atomization / ultrasonic atomization) of the atomization device (6).

[0078] ③ Start the suction fan of the negative pressure box (8) and test whether a stable air curtain (air flow field 12) is formed at the slit (9) of the spray sealing chamber (11).

[0079] 2. Binder preparation:

[0080] Adjust the viscosity of the binder in the main material storage tank to 20 - 60 cp and the solid content to 35% - 40%; dilute the functional additives in the auxiliary material storage tank to the required solid content according to the formula ratio.

[0081] II. Multi-module collaborative sizing process

[0082] 1. Module division of labor:

[0083] ① Module 1 (wetting agent spraying): The wetting agent in the auxiliary material storage tank (2) is quantitatively transported through the control unit (3), atomized by the atomization device (6), and uniformly settles on the surface of the wet felt under the constraint of the air curtain.

[0084] ② Module 2 (binder A + coupling agent spraying): Binder A in the main material storage tank (1) is mixed with the coupling agent in the auxiliary material storage tank (2) in a ratio of 5:1, and the flow rate is precisely controlled by the metering pump.

[0085] ③ Module 3 (binder B spraying): Use binder B in the main material storage tank (1) independently, and after atomization, it reacts with the glue solution of Module 2 on the surface of the wet felt.

[0086] ④ Module 4 (functional additive spraying): Spray the functional additives (such as water repellent) in the auxiliary material storage tank (2) as required.

[0087] Among them, materials such as binder A, binder B, coupling agent, and additives are common components used in the preparation of wet felt, and are not limited. Binder A and binder B only indicate different types of binders and are not limited.

[0088] 2. Air curtain parameter setting:

[0089] Adjust the negative pressure range to -200 to -300 Pa through the negative pressure box (8) to ensure that the air flow velocity inhaled at the slit (9) is 0.5 - 1.2 m / s, and constrain the vertical settlement of the droplets.

[0090] III. Dynamic Control of Sizing Process

[0091] 1. Atomization Monitoring:

[0092] ① Observe the droplet size of the atomization device 6 in real time (the target is 20 - 50 μm). If the atomization is uneven, adjust the atomization pressure or ultrasonic frequency.

[0093] ② Monitor the stability of the air curtain through the transparent side plate of the spray sealing chamber 11 to prevent the deviation of droplets caused by air flow disorder.

[0094] 2. Sizing Quantity Adjustment:

[0095] ① Dynamically adjust the flow rate of the metering pump according to the traveling speed of the wet felt (such as 90 - 110 m / min) to ensure that the single - side sizing quantity is 30 - 35 g / m 2 .

[0096] ② If the sizing quantity deviation exceeds ±2 g / m 2 , immediately calibrate the flow parameters of the control unit (3).

[0097] IV. Quality Control and Abnormality Handling

[0098] 1. Binder Content Detection:

[0099] The production line uses a grammage and glue content measuring instrument to detect the glue content of the felt in real time and feed it back to the central control room.

[0100] 2. System Abnormality Response

[0101] ① If the negative pressure value fluctuates > ±10%, trigger an alarm and suspend sizing, and check for air leakage in the suction fan or sealing chamber.

[0102] ② If the pressure difference of the filter (4) exceeds 0.3 MPa, switch to the standby filter and clean the blocked filter element.

[0103] V. Shutdown and Maintenance

[0104] 1. Glue Liquid Recovery:

[0105] ① Before shutdown, switch the control unit (3) to the "drainage mode" to suck the residual glue liquid in the pipeline back to the storage tank.

[0106] ② Use compressed air to blow - purge the atomization device (6) and the slit (9) to prevent the glue liquid from curing and blocking.

[0107] 2. System Cleaning

[0108] Disassemble the spray sealing chamber (11) and the mesh belt support frame strip plate (10), rinse the glue stains with a neutral cleaning agent, and regularly check the wear condition of the slit.

[0109] Example 3, Preparation Method of Glass Fiber Wet Felts

[0110] This example provides a preparation method of glass fiber wet felts including the sizing method provided in Example 2, which comprises the following steps:

[0111] 1. Wet felt forming: The chopped glass fibers are lifted to the raw material operation platform by a feeding and lifting system, added into the chopped glass fiber bin, sent to a belt scale through a feeding wheel and a belt conveyor, continuously weighed, and then added into a mixing tank to be stirred and dispersed together with white water. Then, they are continuously further stirred and dispersed through two slurry tanks and continuously supplied to a sizing system by a slurry pump.

[0112] The concentration of chopped glass fibers in the mixing pool is 0.1%-0.3%. A lower concentration is beneficial to the dispersion of chopped glass fibers.

[0113] The uniform slurry enters the headbox through a headbox pump and water mixing. The fibers settle on the inclined wire, and the water returns to the white water tank. A part of the white water is pumped back to the mixing tank by a return water pump, and new fibers are added to enter the next cycle. The remaining white water and the fiber-containing white water transported from the mixing tank enter the headbox from the white water tank through the headbox pump and enter the next cycle. The fibers settled on the conveyor belt have a high water content, and the excess water is removed through a vacuum suction box. Then, the wet felt enters the sizing section.

[0114] 2. Wet felt sizing:

[0115] The wet felt formed by the inclined wire is placed on the mesh belt 7 and enters the sizing system.

[0116] The binder in the storage tank is pumped to a binder atomizing device through a metering pump by a pipeline. After atomization, the binder droplets settle on the wet felt under the restraint of an air curtain to complete sizing.

[0117] Air curtain restraint: A negative pressure is generated in the negative pressure box under the action of a suction fan. The negative pressure is transmitted to the spray sealing chamber through the mesh belt support frame, the mesh belt, and the wet felt. Under the action of the negative pressure, air flows into the spray sealing chamber through the slits on both sides of the binder atomizing device on the top plate of the spray sealing chamber, forming an air curtain on both sides of the atomizing device to restrain the binder droplets to move along a specific path. The air flowing in through the slits flows through the wet felt, the mesh belt, and the mesh belt support frame under the action of the negative pressure and enters the negative pressure box, and is discharged through the suction fan.

[0118] For the traditional sizing process of glass fiber wet felts using the glue curtain gluing process, the maximum viscosity of the binder allowed is 40 cp, and the maximum solid content of the binder that can be used is 25%; the maximum viscosity of the binder used in the sizing system provided by the present invention can reach 100 cp, and the solid content of the binder used can reach 40%; the method of the present invention reduces the moisture introduced by the binder, can reduce the moisture content of the as-furnace product by 30%, and reduce the drying energy consumption by 20%-30%.

[0119] The original system can only complete one sizing action, and different components in the binder cannot react. Multiple sizing modules can be added to this system as needed to apply different component binders step by step, realizing the possibility of applying two-component reactive glue.

[0120] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A sizing system with droplet constrained sedimentation for wet glass fiber mat production, characterized in that, Comprising: A material storage device for providing binder materials; A droplet confinement device for atomizing the binder and spreading the binder on the wet felt; The droplet confinement device includes a spray sealing chamber, an atomizing device, a negative pressure device, and a wet felt conveying device. The atomizing device is located in the spray sealing chamber and is connected to the material storage device outside the spray sealing chamber. A plurality of slits are provided at the top of the spray sealing chamber. The wet felt conveying device and the negative pressure device are sequentially arranged below the spray sealing chamber. The negative pressure device generates a negative pressure, and the slits above the atomizing device suck air from the outside due to the negative pressure, forming a downward air flow field in the spray sealing chamber to spread the material in the atomizing device onto the wet felt on the wet felt conveying device.

2. The sizing system with droplet constrained sedimentation for the production of glass fiber wet felts according to claim 1, characterized in that, The negative pressure device includes a negative pressure box, and the negative pressure box is connected to an external suction fan through a suction pipeline.

3. The droplet confinement sedimentation sizing system for the production of glass fiber wet felts according to claim 1, characterized in that, The wet felt conveying device includes a mesh belt and mesh belt support frame strips. The mesh belt support frame strips are arranged at the bottom of the spray sealing chamber and are a plurality of mutually parallel strips. A gap is provided between adjacent mesh belt support frame strips to form an air flow channel between the top plate slits and the mesh belt support frame strips.

4. The sizing system for fog droplet constrained sedimentation in the production of glass fiber wet felts according to claim 3, wherein, A partition plate is provided in the spray sealing chamber to partition the inside of the spray sealing chamber into several modules.

5. The droplet confinement sedimentation sizing system for the production of glass fiber wet felts according to claim 4, characterized in that, In each module, there are two slits, which are respectively located on both sides of the atomizing device.

6. The droplet confinement sedimentation sizing system for the production of glass fiber wet felts according to claim 4, wherein The spray sealing chamber is sealed on five sides, and the outside is a sealing chamber plate made of PVC transparent plate. A spray sealing chamber frame is provided inside the spray sealing chamber plate, and its material is aluminum profile or angle steel.

7. The droplet confinement sedimentation sizing system for the production of glass fiber wet felts according to claim 4, wherein Including one set or more of constrained sedimentation sizing modules, and the constrained sedimentation sizing modules respectively spray at least one of wetting and leveling agents, binders, or additives into the spray sealing chamber.

8. The droplet confinement sedimentation sizing system for the production of glass fiber wet felts according to claim 1, wherein, In the sizing system, the material storage device includes a main material storage tank and an auxiliary material storage tank; The sizing system further includes a feeding device for controlling the supply of binder materials, including a control valve and a metering pump; The sizing system further includes a filtering device; The main material storage tank and the auxiliary material storage tank are respectively connected to the filter through pipelines, and the filter is connected to the atomizing device through a pipeline. The control valve and the metering pump are arranged on the pipelines connecting the main material storage tank and the auxiliary material storage tank to the filter respectively.

9. A sizing method for wet-laid glass fiber felt production using droplet constrained sedimentation, characterized in that, Based on the sizing system according to any one of claims 1 to 8, the sizing method includes a multi-module collaborative sizing process: In module 1: The wetting agent in the auxiliary material storage tank is quantitatively transported by the control unit, atomized by the atomizing device, and uniformly settles on the surface of the wet felt under the constraint of the air curtain; In module 2: The binder A in the main material storage tank is mixed with the coupling agent in the auxiliary material storage tank in proportion, and the flow rate is precisely controlled by the metering pump; In module 3: The binder B in the main material storage tank is used independently, and after atomization, it reacts with the glue liquid of the module on the surface of the wet felt; In module 4: The functional additives in the auxiliary material storage tank are sprayed as needed.

10. A method for preparing a wet glass fiber mat, characterized in that, Including the following steps: S1, Preparation of the wet felt; S2, Sizing. Place the wet felt prepared in step S1 on the mesh belt and enter the sizing system according to any one of claims 1 to 8; The binder in the storage tank is pumped to the binder atomizing device through a pipeline by the metering pump, and after atomization, the binder droplets settle on the wet felt under the constraint of the air curtain to complete sizing.

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