Oven for preparing PTC (Positive Temperature Coefficient) heating film
By setting up a uniform bellows and uniform air plates in the PTC heating film oven, the problem of poor consistency in the traditional oven is solved, and a more uniform distribution of hot air is achieved, and the product yield and production capacity are improved.
Patent Information
- Application Number
- CN202421356235.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-06-13
AI Technical Summary
When preparing PTC heating film in traditional ovens, they lead to poor consistency of the assembly, which affects production efficiency and product qualification rate.
An oven for preparing PTC heating film was designed, using a uniform bellows and uniform air plate structure, so that hot air can evenly penetrate the oven box and ensure that the hot air distribution of the wet film in the oven is evenly distributed.
Through uniform hot air distribution, the yield rate and production capacity of imposition printing are improved, the problem of uneven air flow output in traditional ovens is avoided, and material costs and production time are reduced.
Smart Images
Figure CN222571876U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of PTC heating films, and specifically discloses an oven for preparing the PTC heating films. Background Art
[0002] Since the performance of new energy vehicle power batteries is very poor at low temperatures, it is necessary to add a heating system to the battery. However, according to the requirements of the mileage in national policies, the weight of the entire newly added heating system is particularly concerned. The current PTC heating film is composed of two layers of PI films with high heat and flame resistance and a conductive ink layer. The entire structure is thin, light and soft, which can be in good contact with the battery. It has a large power density at low temperatures, high heating efficiency, and a fast heating rate. Therefore, using PTC heating film to heat the battery is a good choice.
[0003] Since the core heating part with PTC effect is a composite conductive polymer material with added carbon-based conductive components and PTC thermistor, it is highly sensitive to temperature. As the temperature rises, the resistance gradually increases. When it reaches its Curie temperature point, the resistance will show a step-by-step increase. At this time, the power will drop to a stable value, achieving the effect of autonomous temperature control. It is precisely because conductive materials are highly sensitive to temperature that they have higher requirements in the production process. For example, after the printing process is completed, when the printed wet film material needs to be pulled into the oven, the hot air can flow evenly through each pattern area to complete good convection and ensure that the wet film can be evenly heated. There are high requirements for the internal structure, temperature uniformity, and air tightness of the oven.
[0004] However, in the actual production process, when designing a panel of multiple identical resistor patterns, after passing through the oven to dry, the resistance value is tested after the material is rolled up, it is found that the resistance of the pattern area close to the air outlet is larger than that of the area farther away. After multiple attempts, the results are similar. This leads to poor resistance consistency of multiple patterns on the same panel, which deviates from the original intention of the panel design, reduces production efficiency and product qualification rate, affects production capacity, and wastes a lot of material costs.
[0005] Therefore, it is necessary to propose a new oven for preparing PTC heating film, which can effectively solve the problem of poor plate consistency caused by traditional ovens. After optimizing and improving the single airflow output structure of traditional ovens at the source, the product capacity and yield can be improved more efficiently, achieving the effect of reducing costs and increasing efficiency. Utility Model Content
[0006] The utility model aims to overcome the deficiencies of the prior art and provide an oven for preparing a PTC heating film.
[0007] The utility model discloses an oven for preparing a PTC heating film, which adopts the following technical scheme:
[0008] An oven for preparing a PTC heating film comprises a box and a fan, wherein the box is provided with a plurality of rollers for pulling the PTC heating film, the box is provided with an air uniformity box, the fan is arranged on the air uniformity box, an air uniformity plate is provided between the air uniformity box and the box, a plurality of holes are densely arranged on the air uniformity plate, and wind from the fan blows toward the air uniformity box and enters the box through the holes.
[0009] Preferably, both sides of the box body are connected with air uniforming boxes.
[0010] Preferably, the air uniforming boxes are symmetrically arranged on both sides of the box body.
[0011] Preferably, the diameter of the holes on the wind uniforming plate is 0.6±0.05 cm.
[0012] Preferably, the hole spacing on the air uniforming plate is 0.5±0.05 cm.
[0013] Preferably, the box body includes a wet film box and a dry film box, the wet film box is arranged around the dry film box, the uniform air box is connected to the wet film box, the wet film box is provided with a film inlet, the dry film box is provided with a film outlet connected to the wet film box, and a winding roller is provided in the dry film box.
[0014] Preferably, the wet film box at the film inlet position on one side of the dry film box is the film inlet area, the wet film boxes on the other three sides of the dry film box are the drying areas, and the uniform air box is arranged on the wet film box corresponding to the drying area.
[0015] Compared with the prior art, the utility model has at least the following beneficial effects:
[0016] The utility model provides an air uniforming box and an air uniforming plate, so that the hot air blown by the fan is first blown to the air uniforming box, and then the holes on the air uniforming plate are used to make the hot air flow evenly penetrate the plate body from the air uniforming box and blow to the inside of the oven box, so that the hot air in the oven box is evenly distributed, and the wet film in the oven box is heated evenly everywhere, avoiding the situation of incomplete coverage of single air flow output in traditional ovens, and improving the yield rate and production capacity of plate printing. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the overall structure of an oven for preparing a PTC heating film according to this embodiment;
[0018] Figure 2 This is a schematic diagram of the overall structure of the oven used to prepare the PTC heating film in this embodiment from another angle;
[0019] Figure 3A side view of an oven for preparing a PTC heating film according to this embodiment;
[0020] Figure 4 for Figure 3 AA section view.
[0021] Description of Figure Numbers:
[0022] 1. Box body; 101. Roller; 102. Winding roller; 11. Wet film box; 12. Dry film box; 13. Film inlet; 14. Film outlet; 2. Wind uniforming box; 3. Wind uniforming plate; 31. Holes; 4. Fan. DETAILED DESCRIPTION
[0023] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0024] This embodiment discloses an oven for preparing a PTC heating film, referring to Figure 1-4 It includes a box body 1 and a fan 4. A plurality of rollers 101 for pulling the PTC heating film are arranged in the box body 1. A wind uniformity box 2 is arranged on the box body 1. The fan 4 is arranged on the wind uniformity box 2. A wind uniformity plate 3 is arranged between the wind uniformity box 2 and the box body 1. A plurality of holes 31 are densely arranged on the wind uniformity plate 3. The wind of the fan 4 blows toward the wind uniformity box 2 and enters the box body 1 through the holes 31.
[0025] By setting up the air-distributing box 2 and the air-distributing plate 3, and utilizing the holes 31 on the air-distributing plate 3, the hot air flow blown out by the fan 4 can more evenly penetrate the entire plate, achieving the best air flow penetration effect, and further promoting the uniform distribution of heat. When designing a pattern, multiple identical patterns can be selected to form a plate. During batch printing, after a batch of wet films are made, the roller 101 pulls the wet film into the oven box and flows through each temperature zone. The hot air can evenly cover each pattern area, complete good convection, and ensure that the wet film can be evenly heated. After drying, a dry film is formed. When the material is rolled up, it is found that the consistency of the plate is very high, and the situation of incomplete coverage of the single air flow output of the traditional oven no longer occurs. The structure of the oven is optimized to a great extent, so that the yield rate and production capacity of the plate printing are effectively improved.
[0026] In this embodiment, both sides of the box body 1 are connected with the air uniforming boxes 2, and the air uniforming boxes 2 are symmetrically arranged on both sides of the box body 1, so as to further improve the uniform distribution effect of the hot air.
[0027] In this embodiment, the diameter of the holes 31 on the air uniform plate 3 is 0.6±0.05mm, and the spacing between the holes 31 on the air uniform plate 3 is 0.5±0.05cm. Through the above design, the air uniform plate 3 of the air uniform box 2 can blow out a more uniform temperature, and the wind force is more dispersed and gentle, which is not easy to cause local overheating or insufficient temperature of the wet film, and is not easy to cause local damage to the wet film, so that the quality of the PTC heating film dried in the oven is better.
[0028] In this embodiment, the box 1 includes a wet film box 11 and a dry film box 12. The wet film box 11 is arranged around the dry film box 12. The uniform air box 2 is connected to the wet film box 11. The wet film box 11 is provided with a film inlet 13. The dry film box 12 is provided with a film outlet 14 connected to the wet film box 11. The dry film box 12 is provided with a winding roller 102. The wet film after batch printing is pulled into the box 1 of the oven from the film inlet 13. After the hot air blown out by the uniform air box 2 of the wet film box 11 around the box 1 is evenly heated, it is pulled from the film outlet 14 to the dry film box 12, and finally pulled to the winding roller 102 to roll up to obtain a dry film, that is, a PTC heating film product. Through the above layout design, the structural layout of the oven box is optimized, so that the oven space utilization rate is higher and the efficiency of pulling and drying the wet film is faster.
[0029] In this embodiment, the wet film box 11 at the position of the film inlet 13 on one side of the dry film box 12 is the film inlet area, and the wet film boxes 11 on the other three sides of the dry film box 12 are the drying areas, and the air distribution box 2 is arranged on the wet film box 11 corresponding to the drying area. Through the above layout and setting, the wind force is softer when the wet film just enters the film inlet area from the film inlet 13, and after the initial pre-drying in the film inlet area, it is pulled to the drying area to be directly blown by hot air, thereby improving the production efficiency while better protecting the wet film pattern, and further improving the yield rate of plate printing.
[0030] The technical solution provided by the utility model is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and core idea of the utility model. At the same time, for general technicians in this field, according to the idea of the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.
Claims
1. An oven for preparing a PTC heating film, comprising a box and a fan, wherein the box is provided with a plurality of rollers for pulling the PTC heating film, characterized in that: The box body is provided with an air uniform box, the fan is arranged on the air uniform box, an air uniform plate is provided between the air uniform box and the box body, a plurality of holes are densely arranged on the air uniform plate, and the wind from the fan blows toward the air uniform box and enters the box body through the holes.
2. The oven for preparing a PTC heating film according to claim 1, characterized in that: Both sides of the box body are connected with air uniforming boxes.
3. The oven for preparing a PTC heating film according to claim 2, characterized in that: The air uniforming boxes are symmetrically arranged on both sides of the box body.
4. The oven for preparing a PTC heating film according to claim 1, characterized in that: The diameter of the holes on the wind uniforming plate is 0.6±0.05 cm.
5. The oven for preparing a PTC heating film according to claim 1, characterized in that: The hole spacing on the air uniforming plate is 0.5±0.05cm.
6. The oven for preparing a PTC heating film according to claim 1, characterized in that: The box body includes a wet film box and a dry film box, the wet film box is arranged around the dry film box, the uniform air box is connected to the wet film box, the wet film box is provided with a film inlet, the dry film box is provided with a film outlet connected to the wet film box, and a winding roller is provided in the dry film box.
7. The oven for preparing a PTC heating film according to claim 6, characterized in that: The wet film box at the film inlet position on one side of the dry film box is the film inlet area, and the wet film boxes on the other three sides of the dry film box are drying areas. The uniform air box is arranged on the wet film box corresponding to the drying area.