Polyimide color difference eliminating system

Abstract

The utility model belongs to the technical field of polyimide products, and particularly relates to a polyimide chromatic aberration eliminating system. The device comprises a mixing tank, wherein a stirring shaft is arranged in the mixing tank; one end of each feeding pipe is connected with the defoaming kettle, the other end of each feeding pipe is connected with the mixing tank, and each feeding pipe is provided with a metering pump; one end of the discharging pipe is connected with the mixing tank, and the other end of the discharging pipe is connected with production equipment. The defoaming kettle is used for solving the technical problem that the polyimide slurry in a plurality of defoaming kettles in the prior art has color difference, and the color difference can influence the appearance of a prepared film product.

Description

Technical Field

[0001] The utility model belongs to the technical field of polyimide products, and particularly relates to a polyimide color difference elimination system. Background Art

[0002] Polyimide is a commonly used film raw material, and the prepared film has a wide range of uses. In the actual production process, the polyimide film is prepared from polyimide slurry through multiple processes such as casting and curing. Among them, the polyimide slurry needs to be placed in a defoaming kettle for defoaming treatment before casting. And due to the need of production scale, general manufacturers need multiple defoaming kettles to hold polyimide slurries of different production batches. Even if the polyimide slurries of different batches (hereinafter referred to as slurries) are prepared by the same process, there will be color differences that are difficult to distinguish with the naked eye (since the preparation of the slurry is a chemical reaction, there are differences in the reaction degree, temperature and viscosity of the slurry itself in each defoaming kettle, and the external manifestation is the difference in surface color). Whether the slurry is independently extracted from each defoaming kettle or a mixture of slurries is extracted from multiple defoaming kettles (when mixing, the volume of the slurry extracted from each defoaming kettle is random), the color difference of the film products prepared from the extracted slurry will be amplified (the films prepared by independently extracting the slurry have color differences in the depth between batches, and the films prepared by mixing the extracted slurry show stripes under light irradiation), which will affect the appearance of the film products. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a polyimide color difference elimination system for solving the technical problem that there are color differences in the polyimide slurries in multiple defoaming kettles in the prior art, and the color differences will affect the appearance of the prepared film products.

[0004] The technical solution of the utility model to solve the above technical problem is as follows: a polyimide color difference elimination system, comprising:

[0005] A mixing tank, in which a stirring shaft is provided;

[0006] A plurality of feed pipes, one end of each feed pipe is connected to a defoaming kettle, and the other end is connected to the mixing tank. Each feed pipe is provided with a metering pump;

[0007] A discharge pipe, one end of the discharge pipe is connected to the mixing tank, and the other end is connected to production equipment.

[0008] The utility model quantitatively extracts a certain amount of slurry from each defoaming kettle through a metering pump. After these slurries enter the mixing tank and are stirred and fully mixed, the color difference between the slurries in each defoaming kettle can be effectively eliminated to maintain the stability of the product appearance.

[0009] Further: The mixing tank is a vertical tank body, and the vertical tank body includes a tank body and a conical tank bottom arranged under the tank body;

[0010] The stirring shaft is vertically arranged in the tank body, the length of the stirring shaft is adapted to the length of the tank body, and at least one layer of mesh plate is also arranged between the tank body and the conical tank bottom;

[0011] Three inlets are arranged at the top of the tank body, each inlet is connected to the other end of the feed pipe, and one outlet is arranged at the bottom of the conical tank bottom, and the outlet is connected to one end of the discharge pipe.

[0012] Beneficial effects of this step: The stirring shaft is arranged in the tank body, and the slurries entering the tank body from different defoaming kettles are fully mixed under the action of the stirring shaft, and at least one layer of mesh plate plays a role in delaying the speed of the slurry entering the conical tank bottom from the tank body, providing sufficient stirring time for the stirring operation of the stirring shaft.

[0013] Further: A viewing window is also arranged on the side surface of the conical tank bottom.

[0014] Beneficial effects of this step: The remaining amount of the slurry can be observed through the viewing window.

[0015] Further: A liquid level sensor is arranged in the tank body, the liquid level sensor is electrically connected to a controller, and the controller is used to control the three metering pumps.

[0016] Beneficial effects of this step: The controller can sense the remaining volume available for holding the slurry in the mixing tank through the electronic signal of the liquid level sensor, so as to control the pumping volume of each metering pump.

[0017] Further: A breathing valve is also arranged at the top of the tank body.

[0018] Beneficial effects of this step: The breathing valve can keep the inside of the mixing tank in a vacuum state.

[0019] The beneficial effects of the present utility model are:

[0020] By combining the metering pump and the mixing tank, the slurry ratio of each defoaming kettle entering the mixing tank can be effectively controlled, and the color difference of the slurries in different defoaming kettles can be eliminated to the greatest extent, so as to ensure the appearance stability of the produced product. Description of the Drawings

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 FIG. 4 is a schematic structural diagram of a polyimide color difference elimination system provided by the present invention.

[0023] Reference numerals:

[0024] 1 - mixing tank; 2 - feed pipe; 3 - metering pump; 4 - defoaming kettle; 5 - discharge pipe; 6 - valve;

[0025] 11 - tank body; 12 - conical tank bottom; 13 - stirring shaft; 14 - perforated plate. Specific embodiments

[0026] The following will describe in detail the embodiments of the technical solutions of the present invention with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0027] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present invention belongs.

[0028] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0029] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0030] In this application, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0031] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0032] Embodiment

[0033] As Figure 1 shown, a polyimide color difference elimination system provided by the present utility model includes:

[0034] A mixing tank 1, in which a stirring shaft 13 is provided;

[0035] A plurality of feed pipes 2, one end of each feed pipe 2 is connected to a defoaming kettle 4, and the other end is connected to the mixing tank 1, and each feed pipe 2 is provided with a metering pump 3;

[0036] A discharge pipe 5, one end of the discharge pipe 5 is connected to the mixing tank 1, and the other end is connected to production equipment. Valves 6 are provided between the feed pipe 2 and the defoaming kettle 4 and between the discharge pipe 5 and the mixing tank 1, and the valves 6 are generally ball valves or gate valves.

[0037] The present utility model quantitatively extracts a certain amount of slurry from each defoaming kettle 4 through the metering pump 3. After these slurries enter the mixing tank 1 and are stirred and fully mixed, the color difference between the slurries in each defoaming kettle 4 can be effectively eliminated to maintain the stability of the product appearance.

[0038] On the basis of the above technical solution, the mixing tank 1 is a vertical tank body, and the vertical tank body includes a tank body 11 and a conical tank bottom 12 provided under the tank body 11;

[0039] The stirring shaft 13 is vertically arranged inside the tank body 11, and the length of the stirring shaft 13 is adapted to the length of the tank body 11. There is at least one layer of perforated plate 14 between the tank body 11 and the conical tank bottom 12;

[0040] The top of the tank body 11 is provided with three inlets, each inlet is connected to the other end of the feed pipe 2, and the bottom of the conical tank bottom 12 is provided with an outlet, and the outlet is connected to one end of the discharge pipe 5.

[0041] The stirring shaft 13 is arranged inside the tank body 11. The slurries from different defoaming kettles entering the tank body 11 are fully mixed under the action of the stirring shaft 13, and at least one layer of perforated plate 14 plays a role in delaying the speed of the slurry from the tank body 11 entering the conical tank bottom 12, providing sufficient stirring time for the stirring operation of the stirring shaft 13.

[0042] On the basis of the above technical solution, a viewing window is further provided on the side of the conical tank bottom 12.

[0043] The remaining amount of the slurry can be observed through the viewing window to determine whether to inject new slurry into the mixing tank 1.

[0044] On the basis of the above technical solution, a liquid level sensor is arranged inside the tank body 11. The liquid level sensor is placed at the lower end of the tank body 11, and the liquid level sensor is electrically connected to a controller, and the controller is used to control the three metering pumps 3.

[0045] The controller can sense the remaining volume available for storing the slurry in the mixing tank 1 through the electronic signal of the liquid level sensor, so as to control the pumping volume of each metering pump 3. In addition, several color sensors can be arranged inside the tank body. The color sensors are electrically connected to the controller. A PLC or an intelligent chip can be arranged inside the controller, and the output amounts of each defoaming kettle can be adjusted by methods such as PID algorithm.

[0046] On the basis of the above technical solution, a breather valve is further provided on the top of the tank body 11.

[0047] The breather valve can keep the inside of the mixing tank 1 in a vacuum state, avoiding the generation of bubbles during the stirring process of the slurry.

[0048] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A polyimide color difference elimination system, characterized in that Comprising: A mixing tank, in which a stirring shaft is provided; A number of feed pipes, one end of each feed pipe is connected to a defoaming kettle, and the other end is connected to the mixing tank, and each feed pipe is provided with a metering pump; A discharge pipe, one end of the discharge pipe is connected to the mixing tank, and the other end is connected to production equipment.

2. The polyimide color difference elimination system according to claim 1, wherein The mixing tank is a vertical tank body, and the vertical tank body includes a tank body and a conical tank bottom provided under the tank body; The stirring shaft is vertically arranged in the tank body, the length of the stirring shaft is adapted to the length of the tank body, and at least one layer of perforated plate is further provided between the tank body and the conical tank bottom; The top of the tank body is provided with three inlets, each inlet is connected to the other end of the feed pipe, and the bottom of the conical tank bottom is provided with an outlet, and the outlet is connected to one end of the discharge pipe.

3. The polyimide color difference elimination system according to claim 2, characterized in that, A viewing window is further provided on the side surface of the conical tank bottom.

4. The polyimide color difference elimination system according to claim 2, characterized in that, A liquid level sensor is provided in the tank body, the liquid level sensor is electrically connected to a controller, and the controller is used to control the three metering pumps.

5. The polyimide color difference elimination system according to claim 4, wherein, A breathing valve is further provided on the top of the tank body.

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