An oven for precisely controlling the temperature during the curing of a polyimide film

Abstract

The present invention discloses an oven for precisely controlling the temperature during the curing of polyimide films. The air supply mechanism is located inside the oven body. There is an air chamber in the air supply mechanism. The side wall of the air chamber is provided with a main air inlet and an air suction outlet, and the bottom of the air chamber is provided with an air suction inlet and a blowing outlet. An air suction channel and a blowing channel are arranged inside the air chamber. Both ends of the blowing channel are respectively communicated with the main air inlet and the blowing outlet, and both ends of the air suction channel are respectively communicated with the air suction inlet and the air suction outlet. Through the above-optimized designed oven for precisely controlling the temperature during the curing of polyimide films, the structural design is reasonable. Inside the oven body, the surface of the film is directly and continuously blown and sucked by the air supply mechanism, which can directly and quickly precisely control the temperature of the film surface, and can quickly take away the solvent evaporated by the heating of polyimide through air suction, reduce the energy consumption loss during temperature rise and fall, and improve the film drying efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible display, and particularly to an oven for precisely controlling the temperature during the curing of polyimide films. Background Art

[0002] The flexible AMOLED display technology has developed rapidly, making flexible display screens the most high-tech technology in the consumer electronics industry. High-end consumer electronic products such as mobile phones and watches globally choose flexible AMOLED as the display screen. The core of flexible AMOLED lies in the use of a polymer plastic substrate, which needs to have characteristics such as high temperature resistance, corrosion resistance, dimensional stability, high mechanical strength, and easy coating.

[0003] Currently, only polyimide materials can meet the above requirements. Its basic processing process is to coat polyimide slurry on an optical glass, and then cure it into a film under nitrogen protection to make a flexible optical electronic backplane. When making polyimide films, the high-temperature curing step plays a crucial role in the film forming quality. To ensure uniform curing temperature of the polyimide film, the surface temperature of the film is usually controlled in an oven to ensure uniform heating of the film. However, during the heating process of the film, solvents will evaporate, resulting in the inability to directly and precisely control the temperature of the film surface through the ambient temperature in the oven, causing a slow temperature change rate, energy consumption loss during heating and cooling, and low production efficiency and yield of the film products. Summary of the Invention

[0004] To solve the technical problems in the background art, the present invention proposes an oven for precisely controlling the temperature during the curing of polyimide films.

[0005] An oven for precisely controlling the temperature during the curing of polyimide films proposed by the present invention includes: a box body and a blowing mechanism;

[0006] The blowing mechanism is located inside the box body. There is a wind cavity in the blowing mechanism. The side wall of the wind cavity is provided with a main air inlet and an air suction outlet, and the bottom of the wind cavity is provided with an air suction inlet and a blowing outlet. An air suction channel and a blowing channel are arranged inside the wind cavity. Both ends of the blowing channel are respectively communicated with the main air inlet and the blowing outlet, and both ends of the air suction channel are respectively communicated with the air suction inlet and the air suction outlet.

[0007] Preferably, a heat insulation structure is provided between the air suction channel and the blowing channel.

[0008] Preferably, there is a heat insulation cavity in the heat insulation structure, and an air inlet communicating with the main air inlet is provided on the heat insulation cavity.

[0009] Preferably, an air outlet is provided at the bottom of the heat insulation cavity, and the air outlet is communicated with the air suction inlet.

[0010] Preferably, a wind guide plate is provided in the air suction channel, one end of the wind guide plate is located on the side of the air outlet away from the main air inlet, and the other end extends in a direction away from the air suction inlet.

[0011] Preferably, one end of the air suction channel near the air suction inlet has an air suction section, the inner diameter of the air suction section gradually increases from top to bottom, one end of the air blowing channel near the air blowing outlet is provided with an air blowing section, and the inner diameter of the air blowing section gradually decreases from top to bottom.

[0012] Preferably, a plurality of air suction cylinders are provided in the air cavity, and air suction inlets respectively communicating with each air suction cylinder are provided on the side wall of the air cavity. An air suction channel is provided in each air suction cylinder, and the plurality of air suction cylinders are arranged in an array. The outer walls of adjacent air suction cylinders jointly enclose an air blowing channel.

[0013] Preferably, a heat insulation cylinder is further included. The heat insulation cylinder is located between adjacent air suction cylinders. A heat insulation cavity is formed between the outer wall of the heat insulation cylinder and the outer wall of the air suction cylinder, and the air blowing channel is located inside the heat insulation cylinder.

[0014] Preferably, the plurality of air suction inlets are evenly distributed at the bottom of the air supply mechanism, and the plurality of air blowing outlets are evenly distributed at the bottom of the air supply mechanism.

[0015] Preferably, it includes an upper air supply mechanism and a lower air supply mechanism, and a temperature control space is formed therebetween.

[0016] In the present invention, for the oven for precisely controlling the temperature during the curing of polyimide film, the air supply mechanism is located inside the box body. An air cavity is provided in the air supply mechanism. The side wall of the air cavity is provided with a main air inlet and an air suction outlet, and the bottom of the air cavity is provided with an air suction inlet and an air blowing outlet. An air suction channel and an air blowing channel are provided inside the air cavity. The two ends of the air blowing channel are respectively communicated with the main air inlet and the air blowing outlet, and the two ends of the air suction channel are respectively communicated with the air suction inlet and the air suction outlet. Through the above-optimized designed oven for precisely controlling the temperature during the curing of polyimide film, the structural design is reasonable. Inside the box body, the air supply mechanism directly blows and sucks air continuously on the surface of the film, which can directly and quickly precisely control the temperature of the film surface, and can quickly take away the solvent evaporated by the heating of the polyimide through air suction, reduce the energy consumption loss during temperature rise and fall, and improve the film drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an embodiment of an oven for precisely controlling the temperature during the curing of polyimide film proposed by the present invention.

[0018] Figure 2 It is a schematic diagram of the local air flow of the air supply mechanism of an oven for precisely controlling the temperature during the curing of polyimide film proposed by the present invention.

[0019] Figure 3Schematic diagram of the distribution of the air blowing outlet and the air suction inlet of an oven for precisely controlling the temperature during the curing of a polyimide film proposed by the present invention.

[0020] Figure 4 Schematic diagram of the local structure of the air suction cylinder and the heat insulation cylinder of an oven for precisely controlling the temperature during the curing of a polyimide film proposed by the present invention.

[0021] Figure 5 Schematic diagram of the structure of another embodiment of an oven for precisely controlling the temperature during the curing of a polyimide film proposed by the present invention. Specific embodiments

[0022] As Figures 1 to 5 shown, Figure 1 Schematic diagram of the structure of an oven for precisely controlling the temperature during the curing of a polyimide film proposed by the present invention, Figure 2 Schematic diagram of the local air flow of the air supply mechanism of an oven for precisely controlling the temperature during the curing of a polyimide film proposed by the present invention, Figure 3 Schematic diagram of the distribution of the air blowing outlet and the air suction inlet of an oven for precisely controlling the temperature during the curing of a polyimide film proposed by the present invention. Figure 4 Schematic diagram of the local structure of the air suction cylinder and the heat insulation cylinder of an oven for precisely controlling the temperature during the curing of a polyimide film proposed by the present invention. Figure 5 Schematic diagram of the structure of another embodiment of an oven for precisely controlling the temperature during the curing of a polyimide film proposed by the present invention.

[0023] Referring to Figure 1 , an oven for precisely controlling the temperature during the curing of a polyimide film proposed by the present invention includes: a box body 1 and an air supply mechanism 2;

[0024] The air supply mechanism 2 is located inside the box body 1. There is an air chamber inside the air supply mechanism 2. The side wall of the air chamber is provided with a main air inlet 41 and an air suction outlet 31, and the bottom of the air chamber is provided with an air suction inlet 32 and an air blowing outlet 42. An air suction channel 3 and a blowing channel 4 are arranged inside the air chamber. Both ends of the blowing channel 4 are respectively communicated with the main air inlet 41 and the air blowing outlet 42, and both ends of the air suction channel 3 are respectively communicated with the air suction inlet 32 and the air suction outlet 31.

[0025] During the specific working process of the oven for precisely controlling the temperature during the curing of the polyimide film in this embodiment, the film is horizontally arranged below the air supply mechanism. The external air blowing mechanism sends the temperature-controlled gas into the air chamber through the main air inlet. The temperature-controlled gas blows air towards the surface of the film through the blowing channel to ensure precise temperature control on the surface of the film. The film generates evaporation solvent when heated. The temperature-controlled gas carries the evaporation solvent and enters the air suction channel through the air suction inlet, and finally discharges from the air suction outlet, ensuring that the temperature-controlled gas directly reaches the surface of the film and reducing heat loss.

[0026] In this embodiment, an oven for precisely controlling the temperature during the curing of a polyimide film is proposed. The air supply mechanism is located inside the oven body. There is an air cavity in the air supply mechanism. The side wall of the air cavity is provided with a main air inlet and an air suction outlet, and the bottom of the air cavity is provided with an air suction inlet and a blowing outlet. An air suction channel and a blowing channel are arranged inside the air cavity. The two ends of the blowing channel are respectively communicated with the main air inlet and the blowing outlet, and the two ends of the air suction channel are respectively communicated with the air suction inlet and the air suction outlet. Through the oven for precisely controlling the temperature during the curing of the polyimide film with the above optimized design, the structural design is reasonable. Inside the oven body, the surface of the film is directly blown and sucked by the air supply mechanism, which can directly and quickly precisely control the temperature of the film surface, and can quickly take away the solvent evaporated by the heating of the polyimide through air suction, reducing the energy consumption loss during temperature rise and fall and improving the film drying efficiency.

[0027] According to the process requirements of the polyimide film, its curing process needs to first increase the temperature and then decrease the temperature. During this process, the temperature of the temperature control gas needs to change. Therefore, when the temperature control temperature needs to rise or fall, the temperature of the incoming temperature control gas changes, resulting in a large temperature difference between the air suction channel and the blowing channel. The temperature control gas exchanges heat with the gas in the air suction channel in the blowing channel, causing the temperature of the temperature control gas to change when it reaches the film surface, affecting the temperature control effect after the temperature change. Therefore, in the specific implementation manner, a heat insulation structure is arranged between the air suction channel 3 and the blowing channel 4 to reduce the heat loss between the blowing channel and the air suction channel.

[0028] Refer to Figure 2 , in a further implementation manner of the heat insulation structure, a heat insulation cavity 5 is arranged inside the heat insulation structure. The heat insulation cavity 5 is provided with an air inlet 52 communicated with the main air inlet 41; when the gas enters the air cavity through the main air inlet, a part of it enters the blowing channel as the temperature control gas directly to reach the film surface, and the other part enters the heat insulation cavity as the heat insulation medium to prevent the temperature control gas from directly exchanging heat with the gas in the air suction channel and causing heat loss. For example, when it is necessary to increase the temperature of the film surface, the temperature control gas with an increased temperature is sent through the main air inlet. A part of the relatively high-temperature temperature control gas enters the heat insulation cavity to prevent the relatively high-temperature temperature control gas from contacting the reflux gas in the air suction channel and cooling down before reaching the film surface.

[0029] Furthermore, an air outlet 51 is arranged at the bottom of the heat insulation cavity 5, and the air outlet 51 is communicated with the air suction inlet 32; so that the gas entering the heat insulation cavity enters the air suction channel from the air outlet and is discharged, thereby realizing adjusting the temperature of the heat insulation cavity at any time according to the requirements of the temperature change of the temperature control gas to improve the heat insulation effect.

[0030] In the specific design of the gas discharge from the heat insulation chamber, a wind guiding plate 6 is provided in the air suction channel 3. One end of the wind guiding plate 6 is located on the side of the air outlet 51 away from the main air inlet 41, and the other end extends in the direction away from the air suction inlet 32. After the gas enters the air suction channel through the heat insulation chamber air outlet, under the guiding action of the guiding plate, it flows back together with the air suction gas. On the one hand, it avoids the heat insulation gas after heat exchange from reaching the film surface and affecting the temperature of the film surface. On the other hand, the flow direction of the heat insulation gas is consistent with the gas flow direction in the air suction channel, further accelerating the backflow of the air suction gas. On the third hand, when the heat insulation gas flows back, it directly mixes with the gas in the air suction channel, reducing the temperature difference between the air suction and blowing gases.

[0031] According to the film preparation process, when the film needs to change temperature, the temperature-controlled gas after temperature change enters the air supply mechanism. Most of the temperature-controlled gas after temperature change reaches the film surface directly through the blowing channel to control the temperature of the film. A small part enters the heat insulation chamber to insulate the air suction backflow gas before temperature change, avoiding heat exchange between the temperature-controlled gas after temperature change and the air suction backflow gas before temperature change before reaching the film surface, which may affect the temperature. This part of the heat insulation gas after temperature change enters the air suction channel from the air outlet of the heat insulation chamber, and then under the guiding action of the wind guiding plate, it flows back together with the temperature-controlled gas before temperature change flowing back from the film surface. While promoting the accelerated backflow of the temperature-controlled gas before temperature change, it conducts sufficient heat exchange with the backflow gas, further reducing the temperature difference between the backflow gas and the blowing gas after temperature change, thereby minimizing the influence of the backflow gas on the temperature change of the film to the greatest extent.

[0032] In other specific embodiments, the end of the air suction channel 3 close to the air suction inlet 32 has an air suction section, and the inner diameter of the air suction section gradually increases from top to bottom. The end of the blowing channel 4 close to the air outlet 42 is provided with a blowing section, and the inner diameter of the blowing section gradually decreases from top to bottom. Blowing and air suction form a cycle, so that the gas evaporated from the polyimide is sucked away to the greatest extent, further ensuring uniform temperature control of the film surface.

[0033] Refer to Figure 4 , in the actual design of the air suction channel and the blowing channel, a plurality of air suction cylinders 8 are provided in the air chamber, and air suction inlets 32 respectively communicating with each air suction cylinder 8 are provided on the side wall of the air chamber. An air suction channel 3 is provided in each air suction cylinder 8, and the plurality of air suction cylinders 8 are arranged in an array. The outer walls of adjacent air suction cylinders 8 jointly enclose the blowing channel 4. Through the arrangement of the air suction cylinders, it is convenient to form the air suction channel and the blowing channel in the air chamber.

[0034] In the specific design of the heat insulation chamber, this embodiment further includes a heat insulation cylinder 7. The heat insulation cylinder 7 is located between adjacent air suction cylinders 8. An insulation chamber 5 is formed between the outer wall of the heat insulation cylinder 7 and the outer wall of the air suction cylinder 8, and the blowing channel 4 is located inside the heat insulation cylinder 7. Through the design of the heat insulation cylinder, it is convenient to form the heat insulation chamber.

[0035] Reference Figure 3 Figure 3 In order to ensure that the temperature control gas is evenly distributed on the film surface without dead angles, the multiple air suction inlets 32 are evenly distributed at the bottom of the air supply mechanism 2, and the multiple air blowing outlets 42 are evenly distributed at the bottom of the air supply mechanism 2.

[0036]

[0036] In other specific embodiments, the multiple air suction inlets 32 and the multiple air blowing outlets 42 are located on the same plane; further packaging to ensure uniform temperature control on the film surface.

[0037] Reference Figure 5 Figure 5 In the specific design of the oven in this embodiment, an upper air supply mechanism 21 and a lower air supply mechanism 22 can be provided. A temperature control space is formed between the two, and the film is placed in the temperature control space to achieve precise temperature control of both sides of the film from above and below at the same time.

[0038] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An oven for precisely controlling the temperature during the curing of a polyimide film, characterized in that, Comprising: A box body (1) and a air supply mechanism (2); The air supply mechanism (2) is located inside the box body (1). An air cavity is provided inside the air supply mechanism (2). A main air inlet (41) and a suction air outlet (31) are provided on the side wall of the air cavity. An air suction inlet (32) and a blowing air outlet (42) are provided at the bottom of the air cavity. An air suction channel (3) and a blowing air channel (4) are provided inside the air cavity. Two ends of the blowing air channel (4) are respectively communicated with the main air inlet (41) and the blowing air outlet (42). Two ends of the air suction channel (3) are respectively communicated with the air suction inlet (32) and the suction air outlet (31); A heat insulation structure is provided between the air suction channel (3) and the blowing air channel (4); A heat insulation cavity (5) is provided inside the heat insulation structure. An air inlet (52) communicated with the main air inlet (41) is provided on the heat insulation cavity (5); An air outlet (51) is provided at the bottom of the heat insulation cavity (5). The air outlet (51) is communicated with the air suction inlet (32); A wind guiding plate (6) is provided inside the air suction channel (3). One end of the wind guiding plate (6) is located on the side of the air outlet (51) away from the main air inlet (41), and the other end extends in a direction away from the air suction inlet (32); One end of the air suction channel (3) close to the air suction inlet (32) has an air suction section, and the inner diameter of the air suction section gradually increases from top to bottom. One end of the blowing air channel (4) close to the blowing air outlet (42) is provided with a blowing section, and the inner diameter of the blowing section gradually decreases from top to bottom.

2. The oven for precisely controlling the temperature during the curing of the polyimide film according to claim 1, wherein A plurality of air suction cylinders (8) are provided inside the air cavity. Air suction inlets (32) respectively communicated with each air suction cylinder (8) are provided on the side wall of the air cavity. An air suction channel (3) is provided inside each air suction cylinder (8). The plurality of air suction cylinders (8) are arranged in an array, and a blowing air channel (4) is jointly formed between adjacent air suction cylinders (8).

3. The oven for precisely controlling the temperature during the curing of the polyimide film according to claim 2, wherein, It further includes a heat insulation cylinder (7). The heat insulation cylinder (7) is located between adjacent air suction cylinders (8). A heat insulation cavity (5) is formed between the outer wall of the heat insulation cylinder (7) and the outer wall of the air suction cylinder (8). The blowing air channel (4) is located inside the heat insulation cylinder (7).

4. The oven for precisely controlling the temperature during the curing of the polyimide film according to claim 2, wherein The plurality of air suction inlets (32) are uniformly distributed at the bottom of the air supply mechanism (2), and the plurality of blowing air outlets (42) are uniformly distributed at the bottom of the air supply mechanism (2).

5. The oven for precisely controlling the temperature during the curing of the polyimide film according to claim 4, characterized in that, The plurality of air suction inlets (32) and the plurality of blowing air outlets (42) are located on the same plane.

6. The oven for precisely controlling the temperature during the curing of the polyimide film according to claim 1, wherein, It includes an upper air supply mechanism (21) and a lower air supply mechanism (22), and a temperature control space is formed between the two.

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