A polyimide film imidization furnace

Abstract

The invention discloses a polyimide film imidization furnace, which belongs to the technical field of polyimide film production. The imidization furnace includes a furnace body, a conveying device and a heating device. A film inlet is provided at one end of the furnace body, and a film outlet is provided at the other end. The conveying device includes a plurality of first conveying rollers and a plurality of second conveying rollers, and the plurality of first conveying rollers are arranged at the same height, and the plurality of second conveying rollers are arranged at the same height. After the film enters the furnace body from the film inlet, it passes through the plurality of first conveying rollers and the plurality of second conveying rollers in sequence to reach the film outlet. The heating device includes an inductor coil and an induction plate group. The invention heats the film from the middle position, and the electromagnetic induction heating method has high thermal utilization and energy saving, the induction plate is not easy to be damaged, the induction plate is far away from the side wall of the furnace body, and the heat energy loss is small; the inclined plate is parallel to the heated section of the film, and the inclined plate is equal to the distance from the adjacent film as a heat source, so the film heating efficiency is high and the temperature is uniform.

Description

Technical Field

[0001] The invention belongs to the technical field of polyimide film production, and in particular relates to a polyimide film imidization furnace. Background Art

[0002] The general method of producing polyimide film is to directly send the cast film stripped from the cast machine into the imidization furnace for high-temperature thermal imidization treatment. The imidization furnace is equipped with a number of parallel series rollers. The film enters the imidization furnace and is wound on the conveying rollers in the furnace. After the high-temperature treatment in the imidization furnace, the product is rolled up on the winding roller at the outlet of the imidization furnace. In the existing technical solutions, the imidization furnace often uses a heating tube at the bottom of the furnace body, but the method of laying heating tubes at the bottom does not completely heat the film. Some improved solutions use a method of setting heating tubes at the top and bottom of the furnace body to heat the film, but this method of upper and lower heating tubes has a fast temperature rise near the heating tube, while the temperature rises slowly in the middle part of the furnace, and the film temperature on the upper and lower conveying rollers is uneven, affecting the film processing quality. Summary of the invention

[0003] Technical problem: In view of the above problems existing in the prior art, the technical problem to be solved by the present invention is to provide a polyimide film imidization furnace to uniformly heat the film.

[0004] Technical solution: In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A polyimide film imidization furnace comprises a furnace body, a conveying device arranged in the furnace body and a heating device for heating the film, wherein a film inlet is arranged at one end of the furnace body and a film outlet is arranged at the other end, the conveying device comprises a plurality of first conveying rollers and a plurality of second conveying rollers arranged in sequence from the film inlet to the film outlet, the plurality of first conveying rollers are arranged at the same height, and the plurality of second conveying rollers are arranged at the same height, after the film enters the furnace body from the film inlet, it passes through the plurality of first conveying rollers and the plurality of second conveying rollers in sequence to reach the film outlet, and the heating device comprises an induction coil and an induction plate group.

[0006] Preferably, the induction plate group includes a first induction plate for heating the upper surface of the film and a second induction plate for heating the lower surface of the film.

[0007] Preferably, the first induction plate includes a first inclined plate and a second inclined plate, the film between the first conveying roller and the second conveying roller is the first heated section, the film between the second conveying roller and the first conveying roller is the second heated section, the first inclined plate is parallel to the first heated section, and the second inclined plate is parallel to the second heated section.

[0008] Preferably, the second induction plate includes a third inclined plate and a fourth inclined plate, the third inclined plate is parallel to the second heated section, and the fourth inclined plate is parallel to the first heated section.

[0009] Preferably, the distance from the first inclined plate to the adjacent first heated section is equal to the distance from the second inclined plate to the adjacent second heated section, and the distance from the third inclined plate to the adjacent second heated section is equal to the distance from the fourth inclined plate to the adjacent first heated section.

[0010] Preferably, a quartz layer, a first heat-insulating layer, a fixing layer, an inductor coil layer and a second heat-insulating layer are sequentially arranged in the furnace body from the inside to the outside.

[0011] Preferably, the first induction plate is connected to the top wall of the quartz layer, and the second induction plate is connected to the bottom wall of the quartz layer.

[0012] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0013] 1. By setting an induction coil and an induction plate group, the induction plate group includes a first induction plate and a second induction plate arranged in the middle of the furnace body, so as to heat the film from the middle position, the heating is efficient and uniform, the electromagnetic induction heating method has high thermal utilization rate and energy saving, and the induction plate can keep the temperature rise and fall in the furnace synchronously compared with the electric heating tube, the induction plate is not easy to be damaged, the induction plate is far away from the side wall of the furnace body, and the heat energy loss is small;

[0014] 2. The first induction plate includes a first inclined plate and a second inclined plate, and the second induction plate includes a third inclined plate and a fourth inclined plate, which uniformly heat the upper and lower surfaces of the film from the upper and lower sides. The inclined plates are parallel to the heated section of the film, and the inclined plates are at an equal distance from the adjacent films as a heat source, so that the film heating efficiency is high and the temperature is uniform;

[0015] 3. The furnace body is provided with a quartz layer and a first heat-insulating layer, etc., which can provide a clean, stable and heat-insulating furnace chamber for thin film imidization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 yes Figure 1 Enlarged view of point B in the middle. DETAILED DESCRIPTION

[0019] The present invention is further illustrated below in conjunction with specific examples. The examples are implemented based on the technical solutions of the present invention. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0020] like Figure 1 and Figure 3 As shown, a polyimide film imidization furnace comprises a furnace body 1, a conveying device and a heating device, the conveying device and the heating device are arranged in the furnace body 1, the conveying device is used to convey a film 9, the heating device comprises an inductor coil 3 and an induction plate group, and the induction plate group is heated by the electromagnetic induction heating principle to heat the furnace body 1, a film inlet 11 is arranged at one end of the furnace body 1, and a film outlet 12 is arranged at the other end, the film 9 enters the furnace body 1 from the film inlet 11, and exits from the film outlet 12 after imidization, the conveying device comprises a plurality of first conveying rollers 21 and a plurality of second conveying rollers 22, the plurality of first conveying rollers 21 and the plurality of second conveying rollers 22 are arranged in sequence in an S shape, the plurality of first conveying rollers 21 are arranged at the same height near the top wall in the furnace body 1, and the plurality of second conveying rollers 22 are arranged at the same height near the bottom wall in the furnace body 1, and the film 9 is conveyed to the furnace body 1 from the film inlet 11. After the film 9 enters the furnace body 1 from the film inlet 11, it is conveyed in sequence through multiple first conveying rollers 21 and multiple second conveying rollers 22. The film 9 is conveyed in an S shape and then exits from the film outlet 12. The furnace body 1 is provided with a quartz layer 13, a first thermal insulation layer 14, a fixed layer 15, an inductor coil layer 16 and a second thermal insulation layer 17 from the inside to the outside. The quartz layer 13 is made of quartz stone, which is resistant to high temperatures and does not self-ignite, and will not age and produce dust, which is conducive to providing a clean environment for the imidization of the film 9. The first thermal insulation layer 14 is made of thermal insulation cotton for the first thermal insulation. The fixed layer 15 is made of epoxy resin board for fixing the inductor coil 3 in the inductor coil layer 16 to prevent the coil from shifting or deforming during use and affecting the temperature uniformity. The second thermal insulation layer 17 is also made of thermal insulation cotton for the second thermal insulation to isolate the furnace from the environment inside and outside the furnace.

[0021] like Figure 1 and Figure 2 As shown, the induction plate group includes a first induction plate 4 and a second induction plate 5. The first induction plate 4 is used to heat the upper surface of the film 9 from above, and the second induction plate 5 is used to heat the lower surface of the film 9 from below. The first induction plate 4 is connected to the top wall of the quartz layer 13 in the furnace body 1 through a first bracket 71, and the first bracket 71 is made of a high-temperature resistant ceramic material. The second induction plate 5 is connected to the bottom wall of the quartz layer 13 in the furnace body 1 through a second bracket 72, and the second bracket 72 is also made of a high-temperature resistant ceramic material. The two induction plates are located at the middle height in the furnace body 1, and heat is generated from the middle of the furnace body 1 to heat the film 9. The heating temperature of the two induction plates is 380°~450°. The first induction plate 4 and the second induction plate 5 can also be mounted in the furnace body 1 in a manner of connecting the sides to the sides of the quartz layer 13.

[0022] like Figure 1 and Figure 2 As shown, the first induction plate 4 includes a first inclined plate 41 and a second inclined plate 42, and the lower ends of the first inclined plate 41 and the second inclined plate 42 are connected. The second induction plate 5 includes a third inclined plate 51 and a fourth inclined plate 52. The top ends of the third inclined plate 51 and the fourth inclined plate 52 are connected. Under the action of the induction coil 3, the four inclined plates generate heat together. The film 9 is divided into a plurality of heated sections in the furnace body 1. The film 9 between the first conveyor roller 21 and the second conveyor roller 22 is the first heated section 91, and the film 9 between the second conveyor roller 22 and the first conveyor roller 21 is the second heated section 92. When the film 9 enters the furnace body 1, it is conveyed by the first first conveyor roller 21 to the first second conveyor roller 22, and then conveyed by the first second conveyor roller 22 to the second first conveyor roller 21, and then conveyed to the second second conveyor roller 22, and conveyed in sequence, and finally conveyed from the last first conveyor roller 21 to the film outlet 12; the film 9 forms a plurality of first heated sections 91 and a second heated section 92 between the plurality of first conveyor rollers 21 and the second second conveyor rollers 22. The first inclined plate 41 is parallel to the first heated section 91, the second inclined plate 42 is parallel to the second heated section 92, the distance from the first inclined plate 41 to the adjacent first heated section 91 is d1, the distance from the second inclined plate 42 to the adjacent second heated section 92 is d2, d1 is equal to d2, since the distance from the film 9 to the heat source is equal, the upper surfaces of the first heated section 91 and the second heated section 92 are uniformly heated, similarly, the third inclined plate 51 is parallel to the second heated section 92, the fourth inclined plate 52 is parallel to the second heated section 92, and the distance from the first inclined plate 41 to the adjacent first heated section 91 is d2. The inclined plate 52 is parallel to the first heated section 91, the distance from the third inclined plate 51 to the adjacent second heated section 92 is d3, and the distance from the fourth inclined plate 52 to the adjacent first heated section 91 is d4, d3 is equal to d4, so that the lower surfaces of the first heated section 91 and the second heated section 92 are uniformly heated, and d1=d2=d3=d4, so that the upper and lower surfaces of the first heated section 91 and the second heated section 92 are at the same distance from the heat source, and most of the upper and lower surfaces of the film 9 are uniformly heated.

[0023] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A polyimide film imidization furnace, characterized in that: The invention comprises a furnace body (1), a conveying device arranged in the furnace body (1), and a heating device for heating a film, wherein the furnace body (1) is provided with a film inlet (11) at one end and a film outlet (12) at the other end, the conveying device comprises a plurality of first conveying rollers (21) and a plurality of second conveying rollers (22) arranged in sequence from the film inlet (11) to the film outlet (12), the plurality of first conveying rollers (21) being arranged at the same height, the plurality of second conveying rollers (22) being arranged at the same height, the film enters the furnace body (1) from the film inlet (11), passes through the plurality of first conveying rollers (21) and the plurality of second conveying rollers (22) in sequence, and reaches the film outlet (12), the heating device comprises an induction coil (3) and an induction plate group, the induction plate group comprises a plurality of first conveying rollers (21) and a plurality of second conveying rollers (22) for heating the film, and the film enters the furnace body (1) from the film inlet (11), passes through the plurality of first conveying rollers (21) and the plurality of second conveying rollers (22) in sequence, and reaches the film outlet (12), the heating device comprises an induction coil (3) and an induction plate group, the induction plate group comprises a plurality of first conveying rollers (21) and a plurality of second conveying rollers (22) for heating the film. A first induction plate (4) on the upper surface of the film and a second induction plate (5) for heating the lower surface of the film, the first induction plate (4) comprising a first inclined plate (41) and a second inclined plate (42), the film between the first conveying roller (21) and the second conveying roller (22) being a first heated section (91), the film between the second conveying roller (22) and the first conveying roller (21) being a second heated section (92), the first inclined plate (41) being parallel to the first heated section (91), the second inclined plate (42) being parallel to the second heated section (92), the second induction plate (5) comprising a third inclined plate (51) and a fourth inclined plate (52), the third inclined plate (51) being parallel to the second heated section (92), the fourth inclined plate (52) being parallel to the first heated section (91).

2. The polyimide film imidization furnace according to claim 1, characterized in that: The distance from the first inclined plate (41) to the adjacent first heated section (91) is equal to the distance from the second inclined plate (42) to the adjacent second heated section (92), and the distance from the third inclined plate (51) to the adjacent second heated section (92) is equal to the distance from the fourth inclined plate (52) to the adjacent first heated section (91).

3. The polyimide film imidization furnace according to claim 1, characterized in that: The furnace body (1) is provided with a quartz layer (13), a first heat insulation layer (14), a fixing layer (15), an inductor coil layer (16) and a second heat insulation layer (17) in sequence from the inside to the outside.

4. The polyimide film imidization furnace according to claim 3, characterized in that: The first induction plate (4) is connected to the top wall of the quartz layer (13), and the second induction plate (5) is connected to the bottom wall of the quartz layer (13).

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