A heating system for green porcelain tape preparation

Abstract

The utility model belongs to the technical field of special equipment for ceramic capacitor manufacturing, specifically relates to a heating system for green porcelain belt preparation. The heating system for green porcelain belt preparation, including heating chamber, silicon rubber heating plate and hot -blast heating mechanism, load film carries ceramic slurry and can enter from the feed port of one end of heating chamber, leave from the discharge port of the other end, silicon rubber heating plate is fixedly arranged in the heating chamber, and the load film is located above the silicon rubber heating plate when running, the hot -blast heating mechanism is used for introducing the outside air, forms hot -blast after heating and makes hot -blast blow into the heating chamber in the way of parallel to the load film running direction and countercurrent to the load film running direction, and the ceramic slurry on the load film is dried. The utility model has the advantages of low cost, small temperature difference in the width direction of film and high safety.

Description

Technical Field

[0001] This utility model belongs to the technical field of special equipment for ceramic capacitor manufacturing, and specifically relates to a heating system for preparing green ceramic tape. Background Technology

[0002] In the manufacturing process of electronic components such as multilayer ceramic capacitors (MLCCs), the preparation of green ceramic tape (also known as ceramic green body tape) is one of the key steps. This process usually adopts a casting process: ceramic slurry is uniformly coated onto a carrier film base such as polyethylene terephthalate (PET) through the slurry injection port of the casting equipment, and then sent to a heating and drying system for drying to remove the solvent in the slurry, thereby forming a ceramic film (i.e., green ceramic tape) with a certain thickness, mechanical strength, density and good uniformity on the carrier film.

[0003] In existing technologies, drying of green ceramic tapes commonly employs oven heating. For example, CN113997381A discloses a casting apparatus and slurry preparation method for low-temperature co-fired ceramic (LTCC) green ceramic tapes. Inside the oven of this apparatus, several uniformly distributed heating tubes are arranged above and below the conveyor belt's running path. The radiant or convective heat generated by these heating tubes is used to heat and dry the carrier film and the slurry coating on it during operation.

[0004] However, the existing heating technology based on densely arranged heating tubes has the following problems:

[0005] Firstly, to achieve temperature coverage over a large drying area within the oven, a large number of heating tubes are required. This not only significantly increases the material and manufacturing costs of the equipment, but more importantly, it is difficult to achieve a highly uniform temperature field distribution throughout the entire drying chamber, especially along the width and length of the film, with multiple discrete heat sources (heating tubes). Deviations in heating uniformity can lead to inconsistent drying rates in different areas of the green ceramic belt, easily causing defects such as uneven film shrinkage, internal stress, warping, and even cracking, directly affecting the thickness uniformity, flatness, and mechanical strength of the final green ceramic belt product.

[0006] Secondly, the heating elements (especially resistance heating elements or certain types of infrared elements) reach extremely high surface temperatures during operation. During the drying process, if the vapors formed by the evaporation of the slurry solvent (usually organic solvents) accumulate locally within the oven to a certain concentration, they pose a potential risk of combustion or explosion upon contact with the high-temperature heating element surface. This poses a serious threat to the safety of the production environment, requiring additional explosion-proof measures and strict operating procedures, further increasing the system's complexity and operating costs.

[0007] Therefore, there is an urgent need to develop a new heating system for the preparation of green ceramic belts that can effectively reduce equipment manufacturing costs and significantly improve the safety of the heating process while ensuring the drying quality of the green ceramic belts and eliminating the risk of combustion and explosion. Utility Model Content

[0008] The purpose of this invention is to provide a heating system for preparing green ceramic belts that is low in cost and can significantly improve the safety of the heating process.

[0009] To achieve the above objectives, the technical solution specifically provided by this utility model is as follows:

[0010] A heating system for preparing green ceramic belts, comprising:

[0011] The heating chamber allows the carrier membrane carrying the ceramic slurry to enter from the inlet at one end of the heating chamber and exit from the outlet at the other end.

[0012] The silicone rubber heating plate is fixedly installed in the heating chamber and is located above the silicone rubber heating plate during the operation of the carrier film;

[0013] The hot air heating mechanism is used to introduce external air, heat it to form hot air, and then pass the hot air into the heating chamber in a manner that is parallel to and counter-current to the direction of the carrier film's movement to dry the ceramic slurry on the carrier film.

[0014] By adopting the above technical solution, compared to densely arranging a large number of heating tubes (resistance tubes / infrared tubes) on the top and bottom of the oven, the utility model uses a large-area silicone rubber heating plate, which significantly reduces the number of heating elements and directly reduces material costs. The silicone rubber heating plate has a flexible integrated structure, which, compared to the independent control of multiple heating tubes in the prior art, eliminates the need for complex wiring and multi-point temperature control systems, simplifying installation and reducing maintenance difficulty.

[0015] Based on the surface heat source characteristics of silicone rubber heating plates, their heating elements are uniformly embedded in the silicone substrate, forming a continuous surface heat source that directly covers the operating area of ​​the carrier film. This eliminates temperature dead zones caused by traditional point heat sources (heating tubes), achieving uniform heat transfer along the width of the carrier film and avoiding warping and cracking caused by uneven drying in certain areas. Furthermore, the silicone material isolates electrical sparks, and the silicone rubber heating plate operates without an open flame, fundamentally eliminating the risk of combustion and explosion caused by organic solvent vapors contacting high-temperature surfaces.

[0016] Furthermore, the device includes a frame and an openable furnace lid, which forms a heating chamber when fastened onto the frame. The frame provides a rigid platform to ensure a constant distance between the silicone heating plate and the carrier film, achieving stable heat conduction; the furnace lid, when fastened, forms a relatively sealed heating chamber, reducing heat loss and minimizing temperature fluctuations within the chamber.

[0017] Furthermore, the silicone rubber heating plate is laid on the top surface of the frame with its heating surface facing the carrier film, achieving full-width coverage, eliminating edge heat attenuation, and ensuring uniform temperature in the edge area of ​​the carrier film.

[0018] Furthermore, a temperature detection device is installed in the heating chamber to monitor the temperature inside the heating chamber in real time, and process parameters can be dynamically adjusted according to the monitored temperature.

[0019] Furthermore, the furnace cover is provided with an exhaust pipe at the top of the feed inlet end, and an exhaust fan is provided inside the exhaust pipe to discharge the moisture and waste gas in the heating chamber.

[0020] Furthermore, a hot air heating mechanism is disposed on the furnace cover; the hot air heating mechanism includes a hot air box, an exhaust fan, and a heating component; the hot air box has an air inlet and an air outlet communicating with the heating chamber; the exhaust fan and the heating component are disposed in the airflow path inside the hot air box, for introducing external air, heating it to form hot air, and discharging it from the air outlet.

[0021] Furthermore, the air outlet is connected to the heating chamber, and an induced draft box located inside the heating chamber is provided at the air outlet; multiple evenly distributed air inlets are opened on the side plate of the induced draft box facing the furnace cover feed port.

[0022] Furthermore, the hot air box is located on the top of the furnace cover, and its air outlet is located near the material outlet of the furnace cover.

[0023] Furthermore, inside the hot air box, in the direction of airflow, a filter grille, an exhaust fan, and a heating element are sequentially arranged behind the air inlet.

[0024] Furthermore, a baffle parallel to the top surface of the frame is fixedly installed on the inner side of the furnace cover, directly below the exhaust pipe, to prevent hot air from being discharged directly from the feed inlet.

[0025] This utility model has the following beneficial effects:

[0026] 1. This utility model replaces heating tubes with silicone rubber heating plates and dozens of discrete heating tubes with large-area flexible plates, which significantly reduces equipment costs. At the same time, the use of surface heat sources eliminates temperature dead zones and significantly reduces the temperature difference in the width direction of the carrier film. In addition, the silicone insulating material prevents ignition by electric sparks, thus providing higher safety.

[0027] 2. This utility model adopts three-dimensional synergistic heating of hot air and silicone rubber heating plate. The hot air mechanism is integrated into the top of the furnace cover. The airflow covers from top to bottom. The hot air is directed by the air box and blown in a parallel carrier film + counter-current operation mode. The exhaust system maintains a slight negative pressure to ensure smooth and stable operation. The silicone plate is laid on the top surface of the frame with the heating surface facing upward and closely attached to the carrier film. The heating is efficient and uniform, which is more conducive to controlling the quality of the produced green ceramic belt. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the heating system for preparing green ceramic belts in an embodiment of this utility model;

[0029] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Frame; 2. Heating chamber; 21. Feed inlet; 22. Discharge outlet; 23. Temperature detection device; 3. Silicone rubber heating plate; 4. Furnace hood; 41. Exhaust pipe; 42. Baffle; 5. Hot air box; 51. Filter grid; 52. Air outlet; 6. Exhaust box; 61. Air inlet; 7. Winding unit; 8. Casting unit; 9. Winding unit; α. Carrier film. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of this utility model, the present application will be further described in detail below with reference to the accompanying drawings.

[0033] A heating system for preparing green ceramic belts, as described above. Figure 1 The system includes a furnace hood 4 mounted on top of the frame 1, which, when closed, forms a relatively enclosed heating chamber 2. The furnace hood 4 is generally rectangular and box-shaped, hinged to one side of the frame 1. The frame 1 has an inlet 21 and an outlet 22 at each end of its side plates, communicating with the heating chamber 2. The carrier film α, unwound from the winding unit 7, receives the cast ceramic slurry in the casting unit 8. The carrier film α, carrying the ceramic slurry, enters the heating chamber 2 through the inlet 21 at one end and exits through the outlet 22 at the other end. Inside the heating chamber 2, the ceramic slurry is dried to form a green ceramic tape.

[0034] Reference Figure 1 and Figure 2 To reduce costs and improve heating uniformity, several silicone rubber heating plates 3 are laid flat on top of the frame 1 inside the heating chamber 2, with their heating surfaces facing upwards. The carrier film α is positioned above the silicone rubber heating plates 3 as it passes through the heating chamber 2. Replacing traditional heating tubes with silicone rubber heating plates 3 as the heating element significantly reduces equipment costs, eliminates temperature dead zones using a surface heat source, and significantly reduces the temperature difference in the width direction of the carrier film α. Furthermore, the silicone insulating material prevents ignition by electric sparks, resulting in higher safety.

[0035] Reference Figure 1 and Figure 2Above the furnace hood 4, a hot air heating mechanism is also provided. This mechanism introduces external air, heats it to form hot air, and directs the hot air into the heating chamber 2 in a manner parallel to and against the direction of travel of the carrier film α, to dry the ceramic slurry on the carrier film α. The hot air heating mechanism includes a hot air box 5, an exhaust fan, and heating components (not shown in the figure). The hot air box 5 has an air inlet and an air outlet 52 connected to the heating chamber 2. The air inlet is equipped with a filter grille 51, and the air outlet 52 is located near the discharge port 22 of the heating chamber 2. The exhaust fan and heating components are located in the airflow path within the hot air box 5 (not shown in the figure) to introduce external air, heat it to form hot air, and discharge it from the air outlet 52. The specific installation structure of the exhaust fan and heating components is a conventional technique known to those skilled in the art and will not be described in detail here.

[0036] Reference Figure 1 and Figure 2 The air outlet 52 is connected to the heating chamber 2, and an induced draft box 6 is installed at the air outlet 52 inside the heating chamber 2. The induced draft box 6 is rectangular and has an arc-shaped bottom plate; multiple evenly distributed air inlets 61 are opened on the side plate of the induced draft box 6 facing the feed inlet 21 of the furnace cover 4. In this way, hot air can be discharged into the heating chamber 2 against the running direction of the carrier membrane α.

[0037] Reference Figure 1 and Figure 2 In order to monitor the temperature inside the heating chamber 2 in real time, a temperature detection device 23 is installed inside the heating chamber 2. Specifically, the temperature detection device 23 can be a thermocouple fixedly installed by a mounting bracket. Based on the temperature detected by the thermocouple, the equipment parameters can be dynamically adjusted.

[0038] Reference Figure 1 and Figure 2 An exhaust pipe 41 is provided above the furnace cover 4, located at the top of the end of the furnace cover 4 near the feed inlet 21. An exhaust fan (not shown in the figure) is installed inside the exhaust pipe 41 to discharge moisture and waste gas from the heating chamber 2. A baffle 42 parallel to the top surface of the frame 1 is fixedly installed inside the furnace cover 4, directly below the exhaust pipe 41, to prevent hot air from being discharged directly from the feed inlet 21.

[0039] The working principle of this embodiment is as follows: the silicone rubber heating plate 3 heats the carrier film α uniformly across its entire width, causing the internal temperature of the slurry to rise uniformly through heat conduction, evaporating most of the solvent; simultaneously, hot air is evenly distributed through the induced draft box 6 and then blows against the current in parallel to the surface of the carrier film α, causing the carrier film α to gradually move from the relatively low temperature zone at the feed end to the relatively high temperature zone at the discharge end, completely removing residual solvent from the slurry and obtaining a green ceramic belt. The exhaust fan creates a negative pressure zone at the feed inlet 21, forcing the wet exhaust gas to be discharged in a directional manner and preventing diffusion; the baffle 42 prevents hot air from being discharged directly from the feed inlet 21, which helps to protect the stability of the wet slurry.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A heating system for preparing green ceramic tape, comprising a heating chamber (2), wherein a carrier film (α) carrying ceramic slurry can enter from an inlet (21) at one end of the heating chamber and exit from an outlet (22) at the other end, characterized in that, Also includes: The silicone rubber heating plate (3) is fixedly installed in the heating chamber (2), and the carrier film (α) is located above the silicone rubber heating plate (3) during operation; The hot air heating mechanism is used to introduce external air, heat it to form hot air, and allow the hot air to enter the heating chamber (2) in a manner parallel to and against the running direction of the carrier film (α) to dry the ceramic slurry on the carrier film (α).

2. The heating system for preparing green ceramic belts according to claim 1, characterized in that: It includes a frame (1) and an openable furnace cover (4), which forms a heating chamber (2) when fastened onto the frame (1).

3. The heating system for preparing green ceramic belts according to claim 2, characterized in that: The silicone rubber heating plate (3) is laid on the top surface of the frame (1), with its heating surface facing the carrier film (α).

4. The heating system for preparing green ceramic belts according to claim 2, characterized in that: A temperature detection device (23) is installed in the heating chamber (2) to monitor the temperature inside the heating chamber (2) in real time.

5. A heating system for preparing green ceramic belts according to any one of claims 2-4, characterized in that: The furnace cover (4) is provided with an exhaust pipe (41) at the top of the feed inlet (21). An exhaust fan is provided in the exhaust pipe (41) to discharge the moisture and waste gas in the heating chamber (2).

6. A heating system for preparing green ceramic belts according to any one of claims 2-4, characterized in that: The hot air heating mechanism is installed on the furnace cover (4); the hot air heating mechanism includes a hot air box (5), an exhaust fan and a heating component; the hot air box (5) has an air inlet and an air outlet (52) connected to the heating chamber (2); the exhaust fan and the heating component are installed in the airflow path inside the hot air box (5) to introduce external air, heat it to form hot air and discharge it from the air outlet (52).

7. The heating system for preparing green ceramic belts according to claim 6, characterized in that: The air outlet (52) is connected to the heating chamber (2), and an air duct (6) located in the heating chamber (2) is provided at the air outlet (52); multiple evenly distributed air inlets (61) are opened on the side plate of the air duct (6) facing the feed inlet (21) of the furnace cover (4).

8. The heating system for preparing green ceramic belts according to claim 6, characterized in that: The hot air box (5) is located on the top of the furnace cover (4), and its air outlet (52) is located near the material outlet (22) of the furnace cover (4).

9. A heating system for preparing green ceramic belts according to claim 6, characterized in that: Inside the hot air box (5), in the direction of airflow, a filter grille (51), an exhaust fan and a heating component are arranged in sequence behind the air inlet.

10. A heating system for preparing green ceramic belts according to claim 6, characterized in that: A baffle (42) parallel to the top surface of the frame (1) is fixedly installed on the inner side of the furnace cover (4) and directly below the exhaust pipe (41).

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