Temperature control device of polyamide acid resin casting section
By designing a temperature control device to control the heating or cooling of the steel strip and front roller, the problem of slow equipment speed in the thermal imidization process was solved, and the heating uniformity and production efficiency of polyimide film prepared by chemical method were improved.
Patent Information
- Application Number
- CN202422929866.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-29
AI Technical Summary
The domestic thermal imidization process equipment has a relatively slow speed and cannot be used for the chemical preparation of polyimide films. In particular, the heating section where PAA resin is cast onto the steel strip and finally peeled off needs to be upgraded.
Design a temperature control device, including an upper temperature control device and a lower temperature control device, which forms a circulating interconnected structure through a box-type air outlet box and an exhaust device to control the heating or cooling of the steel strip and the front roller, ensuring uniform and stable heating.
It improves the heating efficiency of the equipment and the efficiency and yield of the production line, and is suitable for the chemical preparation of polyimide films, meeting the requirements of the chemical process.
Smart Images
Figure CN223493709U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a temperature control device for polyamic acid resin casting sections. Background Technology
[0002] Polyimide (PI) films possess excellent mechanical, thermal, and electrical insulation properties, making them widely used in microelectronics, rail transportation, aerospace, and other fields. Currently, domestic companies mostly use thermal imidization (thermal method) to prepare polyimide films, while foreign companies generally use chemical imidization (chemical method), which utilizes catalysts and dehydrating agents to rapidly imidize polyamic acid (PAA). Compared to the thermal method, which relies solely on heating to induce imidization, the chemical method produces PI films with faster production speeds, larger widths, and superior performance. While domestic thermal imidization equipment is relatively mature, its slower production speed makes it unsuitable for the chemical method, especially in the heating stage where PAA resin is cast onto the steel strip until final peeling, requiring equipment upgrades. Utility Model Content
[0003] The main purpose of this invention is to provide a temperature control device for the polyamic acid resin casting section, which can achieve better temperature control in the heating section from the casting of PAA resin to the steel strip until the final peeling, by blowing air.
[0004] The technical means adopted in this utility model are as follows. A temperature control device for a polyamic acid resin casting section is installed in the main roller chamber, and a front roller is installed in the main roller chamber. The front roller is connected to a conveyor steel belt that rolls up and down. The conveyor steel belt is defined by position, with the upper layer steel belt at the top and the lower layer steel belt at the bottom. The temperature control device has at least an upper temperature control device, wherein the upper temperature control device is provided with a first air outlet facing upward toward the upper layer steel belt and a second air outlet facing laterally toward the front roller.
[0005] The temperature control device is a box-type air outlet box, and each box-type air outlet box is equipped with an air inlet. The box-type air outlet box is arranged from top to bottom as a first air outlet box and a second air outlet box. The first air outlet box is equipped with a first air outlet section, and the second air outlet box is equipped with a second air outlet section.
[0006] It also includes a lower temperature control device; the lower temperature control device is equipped with a third air outlet facing downwards towards the lower steel strip and a fourth air outlet facing upwards towards the lower steel strip, the third air outlet being located above the lower steel strip and the fourth air outlet being located below the lower steel strip.
[0007] The temperature control device is also a box-type air outlet box, and each box-type air outlet box is equipped with an air inlet. The box-type air outlet box is arranged from top to bottom as a third air outlet box and a fourth air outlet box. The third air outlet box is equipped with a third air outlet section, and the fourth air outlet box is equipped with a fourth air outlet section.
[0008] The structure of the first, second, third, and fourth air outlets consists of several air holes or several slits.
[0009] The lengths of the first, second, third, and fourth air outlets are matched with the width of the conveyor belt.
[0010] The air inlets of the first, second, and third air outlet boxes are located on one side of their respective outlet boxes, while the air inlet of the fourth air outlet box is located at the center of its bottom.
[0011] The first, second, third, and fourth air outlet boxes are equipped with guide plates and / or air regulating plates, and the guide plates are provided with a number of guide holes or a number of slits.
[0012] An exhaust system is also installed inside the main roller chamber, which forms a circulating connection with the temperature control system.
[0013] The beneficial effects of this utility model are: the use of a temperature control device to control the temperature of the steel strip and the front roller allows the equipment to heat or cool down as needed, especially during heating, the overall heating effect is more uniform and stable, which is conducive to improving the efficiency and yield of the entire production line. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of the production equipment of this utility model.
[0015] Figure 2 This is a three-dimensional cross-sectional view of the structure of the present invention located in the main roller chamber.
[0016] Figure 3 This is a three-dimensional structural diagram showing the relative positions of the upper temperature control device, the lower temperature control device, and the exhaust device of this utility model. Detailed Implementation
[0017] Please see Figure 1 The diagram shown illustrates the overall structure of the PAA resin being cast onto the steel strip during the casting process involved in this case, up to and including final peeling. Figure 1The right side is the main roller chamber 1. The relevant structural improvements in this case are in the main roller chamber 1; other parts will not be described in detail. This utility model discloses a temperature control device for a polyamic acid resin casting section. The temperature control device can heat the material and also cool it down when the temperature is too high (by blowing air at different temperatures). In this embodiment, it mainly functions as a heating device. A front roller 11 is installed in the main roller chamber 1. The front roller 1 is connected to the conveyor steel belt 2, which rolls up and down (the other side of the conveyor steel belt is connected to the rear roller 12, and there are several compartments in between, which are irrelevant to this case and will not be described in detail here). The conveyor steel belt 2 is defined by its position: the upper layer steel belt 21 is above, and the lower layer steel belt 22 is below. The key point is that the temperature control device is divided into an upper temperature control device 31 and a lower temperature control device 32. The function of the upper temperature control device 31 is to heat the upper layer steel belt and the front roller simultaneously to achieve better heating effect, especially for the front roller, so that the front roller can stabilize a certain temperature. During rotation, it can also assist in heating the upper and lower steel belts, making the heating temperature of the steel belts more stable. During production, polyamic acid resin is uniformly mixed with catalyst and dehydrating agent, and then cast onto the steel strip through die A. Before entering subsequent processes, the surface of the steel strip in the main roll chamber 1 is heated to accelerate its imidization. Please note that the temperature control device here is a temperature control device; in actual production, the front roll can be additionally heated by other means to meet production requirements.
[0018] The upper temperature control device 31 is provided with a first air outlet 311 facing upward toward the upper steel strip 21 and a second air outlet 312 facing laterally toward the front roller.
[0019] The lower temperature control device 32 is provided with a third air outlet 321 facing downwards towards the lower steel strip 22 and a fourth air outlet 322 facing upwards towards the lower steel strip 22. The third air outlet 321 ( Figure 3 The location indicated by the arrow (visible from below) is above the lower steel strip 22, and the fourth air outlet 322 is below the lower steel strip 22. The upper temperature control device 31 and the lower temperature control device 32 simultaneously blow hot air, ensuring that the steel strip receives adequate heating at both ends of the entire casting process. Alternatively, only the upper temperature control device 31 can be installed, with the lower temperature control device being optional.
[0020] like Figure 2 and Figure 3As shown in the figure, in this specific embodiment, both the upper temperature control device 31 and the lower temperature control device 32 are box-type air outlet boxes. In the attached drawings of the embodiment, they are rectangular box structures, but the actual shape of the box is not fixed. Each box-type air outlet box is equipped with an air inlet 5. There are four box-type air outlet boxes, arranged from top to bottom as a first air outlet box 41, a second air outlet box 42, a third air outlet box 43, and a fourth air outlet box 44. As shown in the figure, the upper temperature control device 31 includes a first air outlet box 41 and a second air outlet box 42, and the lower temperature control device 32 includes a third air outlet box 43 and a fourth air outlet box 44. Specifically, the first air outlet box 41 has a first air outlet 311, the second air outlet box 42 has a second air outlet 312, the third air outlet box 43 has a third air outlet 321, and the fourth air outlet box 44 has a fourth air outlet 322.
[0021] The key here is that the first air outlet 311 blows the lower side of the upper steel strip, the second air outlet 312 blows the front roller, the third air outlet 321 blows the upper side of the lower steel strip, and the fourth air outlet 322 blows the lower side of the lower steel strip.
[0022] The structure and position of the aforementioned air outlets can be adjusted according to requirements. In this preferred embodiment, the first air outlet 312, the second air outlet 312, the third air outlet 321, and the fourth air outlet 322, as shown in the figure, are all elongated air outlets. Furthermore, in order to ensure that the blown hot air can more evenly and stably heat the corresponding positions completely, the length of the elongated air outlet is matched with the width of the conveyor belt, generally set to 1-2.5m.
[0023] The structure of the first, second, third, and fourth air outlets is a number of air holes or slits, and the length of each air outlet is matched with the width of the conveyor belt.
[0024] The air inlets of the first air outlet box 41, the second air outlet box 42, and the third air outlet box 43 are located on one side of their respective outlet boxes, while the air inlet of the fourth air outlet box 44 is located at its bottom center. Furthermore, each of the first air outlet box 41, the second air outlet box 42, the third air outlet box 43, and the fourth air outlet box 44 can be equipped with a guide plate and / or an air regulating plate (not shown in the figure). The guide plate can have several guide holes or several slits. The guide plate can be tilted at an angle as needed, increasing the flow distance of the hot air within the corresponding outlet box and allowing it to reach the corresponding air outlet through the guide holes, thus making the blown hot air more uniform and stable. The tilt angle, the arrangement position and number of guide holes can be adjusted according to requirements, which is known to those skilled in the art.
[0025] Finally, for efficient energy utilization, an exhaust device 7 can be installed at the bottom of the main roller chamber 1. This exhaust device 7 forms a circulating connection with the temperature control device mentioned above, drawing away the blown hot air for circulating heating, and then blowing it into the corresponding air outlet box through the air inlet 5 to form a closed loop. In addition to increasing heating efficiency, it can also reduce the energy consumption of the entire product.
Claims
1. A temperature control device for a polyamic acid resin casting section, comprising a main roller chamber containing a front roller that rotates vertically and is connected to a conveyor steel belt, wherein the conveyor steel belt is defined by position as an upper layer steel belt and a lower layer steel belt, characterized in that... The temperature control device has at least an upper temperature control device, wherein the upper temperature control device is provided with a first air outlet facing upward toward the back of the upper steel strip and a second air outlet facing laterally toward the front roller.
2. The temperature control device for the polyamic acid resin casting section as described in claim 1, characterized in that, The temperature control device is a box-type air outlet box, and each box-type air outlet box is equipped with an air inlet. The box-type air outlet box is arranged from top to bottom as a first air outlet box and a second air outlet box. The first air outlet box is equipped with a first air outlet section, and the second air outlet box is equipped with a second air outlet section.
3. The temperature control device for the polyamic acid resin casting section as described in claim 2, characterized in that, It also includes a lower temperature control device; The lower temperature control device is equipped with a third air outlet facing downwards towards the lower steel strip and a fourth air outlet facing upwards towards the lower steel strip. The third air outlet is located above the lower steel strip, and the fourth air outlet is located below the lower steel strip.
4. The temperature control device for the polyamic acid resin casting section as described in claim 3, characterized in that, The temperature control device is also a box-type air outlet box, and each box-type air outlet box is equipped with an air inlet. The box-type air outlet box is arranged from top to bottom as a third air outlet box and a fourth air outlet box. The third air outlet box is equipped with a third air outlet section, and the fourth air outlet box is equipped with a fourth air outlet section.
5. The temperature control device for the polyamic acid resin casting section as described in claim 4, characterized in that, The structure of the first, second, third, and fourth air outlets consists of several air holes or several slits.
6. The temperature control device for the polyamic acid resin casting section as described in claim 5, characterized in that, The lengths of the first, second, third, and fourth air outlets are matched with the width of the conveyor belt.
7. The temperature control device for the polyamic acid resin casting section as described in claim 6, characterized in that, The air inlets of the first, second, and third air outlet boxes are located on one side of their respective outlet boxes, while the air inlet of the fourth air outlet box is located at the center of its bottom.
8. The temperature control device for the polyamic acid resin casting section as described in claim 7, characterized in that, The first, second, third, and fourth air outlet boxes are equipped with guide plates and / or air regulating plates, wherein the guide plates are provided with several guide holes or several slits.
9. The temperature control device for the polyamic acid resin casting section as described in claim 1, characterized in that, An exhaust system is also installed inside the main roller chamber, which forms a circulating connection with the temperature control system.