Coating liquid bubble eliminating device

Abstract

The utility model relates to the field of coating film production, in particular to a coating liquid bubble eliminating device which comprises a coating liquid storage tank, a defoaming tank, a first liquid inlet pipe, a second liquid inlet pipe and a liquid return pipe. The coating liquid storage tank comprises a storage tank body and a grating plate. According to the utility model, the grating plate is arranged, and bubbles are isolated above the liquid inlet by utilizing the characteristic that the bubbles float on the surface, so that the bubbles do not float to the liquid inlet and enter a circulating system, and the performance of coating liquid is not influenced. In addition, the defoaming tank, the vacuum pump, the one-way valve and the floating ball valve are arranged, the coating liquid is subjected to defoaming treatment according to the vacuum defoaming principle, bubbles in the coating liquid are eliminated as much as possible, and the possibility that the bubbles have adverse effects on coating production is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of coating film production, especially to a coating liquid bubble eliminating device. BACKGROUND

[0002] At present, coating is a common surface treatment processing method in BOPET coating film production, and most of the existing coating liquids are water-based coating liquids, which are prone to generate a large number of bubbles during use due to flow and stirring during liquid preparation.

[0003] The bubble components generated in the entire coating system are the coating liquid body, and the currently used coating liquid is mostly water-based coating liquid. The water-based coating liquid has the characteristics of strong fluidity and small viscosity. During use, a large number of bubbles are easily formed in the flow process due to the large amount of air contained in the return liquid pipe, and these bubbles will enter the coating liquid storage tank with the return liquid, resulting in that the inlet liquid also contains bubbles.

[0004] After the bubbles in the coating liquid accumulate, they are extremely easy to enter the coating chamber of the micro-concave roller coater. The bubbles will adhere to the gap between the doctor blade and the micro-concave roller, resulting in uneven distribution of the coating liquid in the micro-concave roller holes and causing uneven coating or even coating leakage. The strip-shaped coating on the film surface leads to dark lines, which affects downstream processing.

[0005] Patent CN202322415697.6 A coating liquid slow stirring device for eliminating bubbles, comprising a glue storage barrel, a slanting scraper is arranged in the inner cavity of the glue storage barrel, one end of the slanting scraper is fixedly connected with a connecting disc, the top of the connecting disc is fixedly connected with a stirring rod, four groups of stirring rods are symmetrically fixed on the top of the connecting disc, a barrel cover is arranged on the top of the stirring rod, a connecting pipe is arranged in the inner cavity of the barrel cover, the top of the connecting pipe penetrates through the barrel cover and is connected with the output end of an air extractor, and a water storage barrel is arranged on the outer wall of the glue storage barrel; the slanting scraper is driven to rotate by the connecting disc, so as to scrape off the coating liquid adhered to the inner cavity of the glue storage barrel, make the coating liquid flow downward along the slanting scraper, and discharge the coating liquid when it flows to the discharge pipe, thereby avoiding the residue of a large amount of coating liquid in the glue storage barrel as much as possible, and improving the practicability of the device.

[0006] This patent solves the problem of bubble generation in thick coating liquid, but does not have a good solution to the problem of bubble generation in water-based coating liquid. UTILITY MODEL CONTENT

[0007] (I) Technical problem to be solved

[0008] The technical problem to be solved by the utility model is the problem of a large number of bubbles generated in the coating liquid during use due to flow and stirring during liquid preparation in BOPET coating film production.

[0009] (II) Technical scheme

[0010] To solve the above technical problems, the utility model provides a kind of coating liquid bubble elimination device, for being connected with coating machine to eliminate the bubble in coating liquid, the coating liquid bubble elimination device includes coating liquid storage tank, defoaming tank, first liquid inlet pipe, second liquid inlet pipe and liquid return pipe;The first liquid inlet pipe connects the coating liquid storage tank with the defoaming tank, the second liquid inlet pipe connects the defoaming tank with the coating machine, and the liquid return pipe connects the coating liquid storage tank with the coating machine.

[0011] As a preferred embodiment of the utility model, the coating liquid storage tank includes a tank body and a grid plate; the tank body has a liquid return port and a liquid outlet, the grid plate is arranged in the tank body, the liquid return port is connected with the second liquid inlet pipe and located above the grid plate, and the liquid outlet is connected with the first liquid inlet pipe and located below the grid plate.

[0012] As a preferred embodiment of the utility model, the defoaming tank includes a defoaming tank body and a vacuum pump; the defoaming tank body has a liquid inlet and an exhaust port, the exhaust port is connected with the vacuum pump, and the liquid inlet is connected with the first liquid inlet pipe.

[0013] As a preferred embodiment of the utility model, the defoaming tank further includes a float valve and a controller, the float valve is arranged at the liquid inlet, and the controller is electrically connected with the float valve and the vacuum pump.

[0014] As a preferred embodiment of the utility model, the position of the exhaust port is higher than that of the liquid inlet.

[0015] As a preferred embodiment of the utility model, a one-way valve is further included, the one-way valve is arranged on the second liquid inlet pipe, and the one-way valve is electrically connected with the controller.

[0016] As a preferred embodiment of the utility model, the coating machine has a circulating pump, and the circulating pump is connected with the second liquid inlet pipe.

[0017] As a preferred embodiment of the utility model, a liquid pump is further included, and the liquid pump is arranged on the first liquid inlet pipe

[0018] The other end of the first liquid inlet pipe is connected with the coating liquid storage tank, and a liquid return port is arranged above the other end of the first liquid inlet pipe, and a grid plate is arranged at the lower end of the liquid return port of the coating liquid storage tank, after the coating liquid starts to circulate, a large amount of bubbles will be accumulated at the liquid return port of the coating liquid storage tank due to the characteristics of the water-based coating liquid and the height difference when the liquid returns, and the grid plate is arranged in the coating liquid storage tank body, so that the bubbles are isolated above the liquid inlet port by the characteristics of the bubble floating surface without affecting the flow of the coating liquid, and the bubbles do not float into the circulating system, and the bubbles will slowly break in the case of long-term standing, and the bubbles in the coating liquid do not affect the performance of the coating liquid, and the liquid with less bottom bubble content is pumped into the defoaming tank.

[0019] The defoaming tank is connected with an exhaust pipe, one side of the exhaust pipe is connected with the inlet of the first liquid inlet pipe, and the other side of the exhaust pipe is connected with the second liquid inlet pipe, the connection position of the first liquid inlet pipe in the defoaming tank is higher than the connection position of the second liquid inlet pipe, the defoaming tank is defoamed in the form of negative pressure drawn by the vacuum pump, the control of the vacuum pump is linked with the float ball valve, after the liquid level in the defoaming tank reaches a specified height, the float ball valve is closed, the vacuum pump is started, and the air above the liquid surface is drawn out, so that the negative pressure is formed in the defoaming tank, under the action of the negative pressure, the bubbles will expand, float up and finally break, and the bubbles are eliminated as much as possible by pressure maintaining for a period of time.

[0020] (Three) beneficial effects

[0021] The above technical scheme of the utility model has the following advantages:

[0022] 1. The coating liquid can be placed in the coating liquid storage tank to eliminate bubbles, and then enter the defoaming tank to defoam by the principle that bubbles will rapidly expand and break under negative pressure.

[0023] 2. The coating liquid storage tank comprises a tank body and a grid plate, the tank body has a liquid return port and a liquid outlet port, the grid plate is arranged in the tank body, the liquid return port is connected with the second liquid inlet pipe and located above the grid plate, and the liquid outlet port is connected with the first liquid inlet pipe and located below the grid plate. The coating liquid enters the tank body through the liquid return port, flows through the grid plate and finally flows out from the liquid outlet port, when the coating liquid flows through the grid plate, the bubbles are isolated on the grid plate by the characteristics of the bubble floating surface, so that the bubbles do not float into the circulating system and affect the performance of the coating liquid.

[0024] 3. The liquid level height in the defoaming tank is controlled by the float ball valve, a one-way valve is arranged at the liquid outlet port of the defoaming tank to avoid liquid backflow during the process of negative pressure drawing and pressure maintaining. The defoaming tank is defoamed in the form of negative pressure drawn by the vacuum pump, the control of the vacuum pump is linked with the float ball valve, after the liquid level in the defoaming tank reaches a specified height, the float ball valve is closed, the vacuum pump is started, and the air above the liquid surface is drawn out, so that the negative pressure is formed in the defoaming tank, under the action of the negative pressure, the bubbles will expand, float up and finally break, and the bubbles are eliminated as much as possible by pressure maintaining for a period of time. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 Flow chart of coating process device of the present application;

[0026] Figure 2 Top view and side view of the coating bubble improvement device of the present application.

[0027] In the figure: 1, coating liquid storage tank; 2, defoaming tank; 3, coating machine; 4, float valve; 5, vacuum pump; 6, check valve; 7, first liquid inlet pipe; 8, second liquid inlet pipe; 9, liquid return pipe; 10, grating plate. DETAILED DESCRIPTION

[0028] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Figure 1 Flow chart of coating process device of the present application, as shown in Figure 1 A coating liquid bubble elimination device for connecting with a coating machine to eliminate bubbles in the coating liquid, the coating liquid bubble elimination device comprising a coating liquid storage tank 1, a defoaming tank 2, a first liquid inlet pipe 7, a second liquid inlet pipe 8 and a liquid return pipe 9; the first liquid inlet pipe 7 connects the coating liquid storage tank 1 and the defoaming tank 2, the second liquid inlet pipe 8 connects the defoaming tank 2 and the coating machine 3, and the liquid return pipe 9 connects the coating liquid storage tank 1 and the coating machine 3.

[0032] The coating liquid storage tank 1 comprises a tank body and a grid plate 10; the tank body has a liquid return port and a liquid outlet port, the grid plate 10 is arranged in the tank body, the liquid return port is connected with the second liquid inlet pipe 8 and located above the grid plate 10, and the liquid outlet port is connected with the first liquid inlet pipe 7 and located below the grid plate 10. The grid plate 10 uses the characteristics of the bubble floating surface to isolate the bubbles above the liquid inlet port so that the bubbles do not float to the liquid inlet port and enter the circulating system, thereby affecting the performance of the coating liquid.

[0033] The defoaming tank 2 comprises a defoaming tank body and a vacuum pump 5; the defoaming tank body has a liquid inlet port and an exhaust port, the exhaust port is connected with the vacuum pump 5, and the liquid inlet port is connected with the first liquid inlet pipe 7.

[0034] The defoaming tank 2 further comprises a float ball valve 4 and a controller, the float ball valve 4 is arranged at the liquid inlet port, and the controller is electrically connected with the float ball valve 4 and the vacuum pump 5. The liquid level in the defoaming tank is controlled by the float ball valve. The controller is internally provided with a related control program, and the float ball valve 4 and the vacuum pump 5 are linked by the related control program, that is, after the liquid level in the defoaming tank 2 reaches a specified height, the float ball valve 4 is closed, the vacuum pump 5 is started, the air above the liquid surface is pumped out, a negative pressure is formed in the defoaming tank 2, the bubbles are inflated and float up under the action of the negative pressure and are finally broken, the bubbles are eliminated as much as possible by maintaining the pressure for a period of time, then the vacuum pump 5 is closed, and the one-way valve 6 is opened, so that the coating liquid subjected to the defoaming treatment is sent into the buffer tank and then into the coating machine to perform a subsequent coating process. When the liquid level in the defoaming tank 2 drops to a liquid supplement threshold, the one-way valve 6 is closed, and the next round of coating liquid defoaming process is started.

[0035] The position of the exhaust port is higher than that of the liquid inlet port.

[0036] The coating liquid bubble elimination device further comprises a one-way valve 6, the one-way valve 6 is arranged on the second liquid inlet pipe 8, and the one-way valve 6 is electrically connected with the controller. The one-way valve 6 prevents liquid backflow during the process of pumping the negative pressure and maintaining the pressure.

[0037] The coating machine is provided with a circulating pump, and the circulating pump is connected with the second liquid inlet pipe 8. The circulating pump is used for pumping the coating liquid from the defoaming tank 2 to the coating machine 3.

[0038] The coating liquid bubble elimination device further comprises a liquid pump, and the liquid pump is arranged on the first liquid inlet pipe 7. The liquid pump is used for pumping the coating liquid from the storage tank 1 to the defoaming tank 2.

[0039] The accompanying drawings are used to further illustrate the present application. Figure 1 The accompanying drawings are used to further illustrate the present application. Figure 2 The accompanying drawings are used to further illustrate the present application. Figure 1 The accompanying drawings are used to further illustrate the present application. Figure 2 The accompanying drawings are used to further illustrate the present application.

[0040] The working principle of the above embodiment is that: after the coating liquid starts circulating, because of the characteristics of the water-based coating liquid and the high-low difference when the liquid is returned, a large amount of bubbles will accumulate at the liquid return port. The purpose of adding the grid plate in the tank is to isolate the bubbles floating on the surface from floating into the liquid inlet and entering the circulating system without affecting the flow of the coating liquid. The bubbles will slowly break down on their own in the case of long-term static state. The bubbles in the coating liquid will not affect the performance of the coating liquid. The liquid with less bottom layer bubble content is pumped into the defoaming tank. The liquid level height in the defoaming tank is controlled by the floating ball valve. The liquid outlet of the defoaming tank is provided with a one-way valve to prevent liquid backflow during negative pressure pumping and pressure maintaining. The defoaming tank is defoamed by vacuum pumping. The control of the vacuum pump is linked with the floating ball valve. When the liquid level in the defoaming tank reaches a specified height, the floating ball valve is closed, and the vacuum pump is started to pump out the air above the liquid surface, so that negative pressure is formed in the defoaming tank. Under the action of negative pressure, the bubbles will swell and float and eventually break. After a period of pressure maintaining, the bubbles are eliminated as much as possible. Then the vacuum pump is closed, and the one-way valve is opened to send the coating liquid treated by defoaming into the buffer tank and then into the coating machine for subsequent coating process. When the liquid level in the defoaming tank drops to the liquid supplement threshold, the one-way valve is closed, and the next coating liquid defoaming process is started.

[0041] It should be noted that each embodiment in the specification is described in a progressive manner, and the same or similar parts of each embodiment can be referred to each other. Each embodiment focuses on the difference from other embodiments. For the method embodiment, the relevant part can be referred to the part of the device embodiment (according to the writing situation). The utility model is not limited to the specific steps and structures described above and shown in the drawings. Moreover, in order to be brief, the detailed description of known methods and technologies is omitted.

[0042] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principle of the utility model, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection range of the utility model.

Claims

1. A coating liquid bubble eliminating device characterized by comprising: The application discloses a coating liquid bubble eliminating device connected with a coating machine, which comprises a coating liquid storage tank (1), a defoaming tank (2), a first liquid inlet pipe (7), a second liquid inlet pipe (8) and a liquid return pipe (9); the first liquid inlet pipe (7) is connected with the coating liquid storage tank (1) and the defoaming tank (2), the second liquid inlet pipe (8) is connected with the defoaming tank (2) and the coating machine (3), and the liquid return pipe (9) is connected with the coating liquid storage tank (1) and the coating machine (3).

2. The coating liquid bubble eliminating device according to claim 1, wherein The coating liquid storage tank (1) comprises a tank body and a grid plate (10); the tank body is provided with a liquid return port and a liquid outlet port, the grid plate (10) is arranged in the tank body, the liquid return port is connected with the second liquid inlet pipe (8) and located above the grid plate (10), and the liquid outlet port is connected with the first liquid inlet pipe (7) and located below the grid plate (10).

3. The coating liquid bubble eliminating device according to claim 1, wherein The defoaming tank (2) comprises a defoaming tank body and a vacuum pump (5); the defoaming tank body is provided with a liquid inlet port and an exhaust port, the exhaust port is connected with the vacuum pump (5), and the liquid inlet port is connected with the first liquid inlet pipe (7).

4. The coating liquid bubble eliminating device according to claim 3, wherein The defoaming tank (2) further comprises a float ball valve (4) and a controller, the float ball valve (4) is arranged at the liquid inlet port, and the controller is electrically connected with the float ball valve (4) and the vacuum pump (5).

5. The coating liquid bubble eliminating device according to claim 4, wherein The position of the exhaust port is higher than that of the liquid inlet port.

6. The coating liquid bubble eliminating device according to claim 4, wherein A one-way valve (6) is further arranged on the second liquid inlet pipe (8), and the one-way valve (6) is electrically connected with the controller.

7. The coating liquid bubble eliminating device according to claim 1, wherein The coating machine is provided with a circulating pump connected with the second liquid inlet pipe (8).

8. The coating liquid bubble eliminating device according to claim 1, wherein A liquid pump is further arranged on the first liquid inlet pipe (7).

Images