A calendering method for aramid insulation paper

Abstract

The application provides a calendering method of aramid insulation paper, and relates to the field of high polymer chemistry and polymer processing, and comprises the following steps: step one, preheating aramid insulation paper; step two, feeding the substrate into a calendering machine, and performing calendering treatment at a set temperature, pressure and linear speed by using a multi-stage pressure control system; and step three, monitoring the thickness uniformity and surface quality of the aramid insulation paper in real time through an online detection system. The application has the following advantages: through the synergistic effect of multi-stage progressive pressure control, high-precision temperature regulation (±2 ℃) and optimized linear speed, and in combination with machine vision online detection and real-time feedback, the shortcomings of traditional calendering processes are effectively overcome, the surface smoothness, thickness uniformity and mechanical properties of the aramid insulation paper are significantly improved, the precision, efficiency and quality consistency of the production process are greatly improved, and the generation of surface defects such as stripes and corrugations is avoided.

Description

Technical Field

[0001] This invention relates to the field of polymer chemistry and polymer processing, and particularly to a calendering method for aramid insulating paper. Background Technology

[0002] Aramid insulating paper is a high-grade specialty paper-based material made from high-performance aramid fibers. It possesses excellent electrical insulation, superior mechanical strength, outstanding heat resistance, and chemical stability. Thanks to its inherent flame-retardant properties, it can operate stably for extended periods at temperatures up to 220°C, while also exhibiting excellent dimensional stability and tear resistance. These unique comprehensive properties make it an indispensable key insulating material in high-end motors, transformers, and electronic equipment, widely used in H-class and higher insulation systems, effectively ensuring the safe, reliable, and long-term operation of electrical equipment in harsh environments.

[0003] In the traditional production of aramid insulating paper, calendering is a key step in improving its surface smoothness, thickness uniformity, and physical properties. However, existing calendering processes have significant shortcomings: insufficient precision in calendering temperature control, which can easily lead to excessive thermal softening of aramid fibers and affect the mechanical properties of the insulating paper; a single pressure adjustment method, which cannot provide differentiated treatment according to the different thickness and density requirements of the insulating paper; and an unreasonable match between calendering speed and process parameters, which affects both production efficiency and product quality consistency. At the same time, the lack of an effective quality control mechanism makes the calendered insulating paper prone to surface defects such as streaks and ripples. Summary of the Invention

[0004] The purpose of this invention is to provide a calendering method for aramid insulating paper, which solves the problems in the existing traditional aramid insulating paper calendering process, such as insufficient temperature control precision, single pressure adjustment method, unreasonable matching of calendering speed and process parameters, and lack of effective quality control mechanism. These problems lead to excessive heat softening of fibers, inability to meet differentiated processing requirements, poor consistency of production efficiency and product quality, and easy occurrence of surface defects.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0006] A calendering method for aramid insulating paper includes the following steps: Step 1: Preheating the aramid insulating paper;

[0007] Step 2: The substrate is fed into the calender and calendered under the set temperature, pressure and linear speed using a multi-stage pressure control system.

[0008] Step 3: Monitor the thickness uniformity and surface quality of the aramid insulating paper in real time using an online detection system.

[0009] As an improvement, the pressure range in step one is 10-50 MPa, with pressure adjusted in stages, and each pressure level held for 30-60 seconds.

[0010] As an improvement, in step two, the calendering temperature is controlled within the range of 150-180℃ with a temperature control accuracy of ±2℃, and the calendering speed is adjusted to 0.5-2.0m / min, and matched and optimized with the pressure and temperature parameters.

[0011] As an improvement, the target thickness and density of the aramid insulating paper are determined by dividing the calendering process into at least two stages, with different linear pressures applied in different stages, and the linear pressure in the later stage is not lower than that in the earlier stage.

[0012] As an improvement, the online inspection system includes a thickness measurement module, a surface defect detection module, and a real-time feedback control module.

[0013] As an improvement, the surface defect detection module adopts machine vision technology, which can automatically identify surface defects such as stripes and ripples, with a detection accuracy of 0.01mm.

[0014] As an improvement, a cooling process after calendering is also included to control the cooling temperature gradient and prevent the aramid insulating paper from deforming due to thermal stress.

[0015] As an improvement, the preheating process uses a circulating hot air preheating method to ensure that the aramid insulating paper is heated evenly.

[0016] As an improvement, the multi-stage pressure regulation includes three levels: the first level pressure is 10-20 MPa, the second level pressure is 25-35 MPa, and the third level pressure is 40-50 MPa.

[0017] As an improvement, the process parameters of the calendering method are optimized through artificial intelligence algorithms to achieve the optimal matching of calendering speed, pressure and temperature, thereby improving the surface smoothness and thickness uniformity of aramid insulating paper.

[0018] The beneficial effects of this invention are as follows: by adopting a combination of preheating treatment, multi-level pressure control system and high-precision temperature control, and introducing an integrated machine vision online detection and real-time feedback mechanism, the stability of the calendering process and product consistency can be significantly improved, effectively avoiding fiber thermal damage and surface defects, and ultimately enabling aramid insulating paper to obtain excellent surface smoothness, thickness uniformity and physical and mechanical properties.

[0019] The following detailed embodiments further illustrate the above-described content of the present invention. However, this should not be construed as limiting the scope of the present invention to the following examples. All technologies implemented based on the above-described content of the present invention fall within the scope of the present invention. Detailed Implementation

[0020] The present invention is illustrated below with specific embodiments, which are not intended to limit the scope of the invention.

[0021] A calendering method for aramid insulating paper includes the following steps: Step 1, preheating the aramid insulating paper; Step 2, feeding the substrate into a calender and calendering it under set temperature, pressure and linear speed using a multi-stage pressure control system; Step 3, monitoring the thickness uniformity and surface quality of the aramid insulating paper in real time using an online detection system.

[0022] In step one, the pressure range is 10-50 MPa, with pressure adjusted in stages, and each pressure level held for 30-60 seconds. In step two, the calendering temperature is controlled within the range of 150-180℃, with a temperature control accuracy of ±2℃, and the calendering speed is adjusted to 0.5-2.0 m / min, and optimized in conjunction with the pressure and temperature parameters.

[0023] The target thickness and density of the aramid insulating paper are determined by dividing the calendering process into at least two stages, with different linear pressures applied in each stage, and the linear pressure in each subsequent stage being no less than that in the previous stage. The online inspection system includes a thickness measurement module, a surface defect detection module, and a real-time feedback control module. The surface defect detection module employs machine vision technology to automatically identify surface defects such as stripes and ripples, achieving a detection accuracy of 0.01 mm. The system also includes a cooling process after calendering to control the cooling temperature gradient and prevent deformation of the aramid insulating paper due to thermal stress.

[0024] The preheating process employs a circulating hot air preheating method to ensure uniform heating of the aramid insulating paper. The multi-stage pressure adjustment includes three levels: the first level is 10-20 MPa, the second level is 25-35 MPa, and the third level is 40-50 MPa. The process parameters of the calendering method are optimized using artificial intelligence algorithms to achieve the optimal match between calendering speed, pressure, and temperature, thereby improving the surface smoothness and thickness uniformity of the aramid insulating paper.

[0025] During the operation, the aramid insulating paper is first uniformly preheated with circulating hot air. Then, the preheated substrate is sent into a calender. Under the conditions of 150-180℃ and a temperature accuracy of ±2℃, a three-stage progressive pressure system is used to apply pressure of 10-20MPa, 25-35MPa and 40-50MPa in sequence, and calendering is carried out with an optimized linear speed of 0.5-2.0m / min. During the process, the thickness uniformity and surface defects are monitored in real time by an online detection system with integrated machine vision. Finally, a controllable cooling process is used to eliminate thermal stress, and aramid insulating paper with excellent surface smoothness, thickness consistency and mechanical properties is obtained.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A calendering method for aramid insulating paper, characterized in that, Includes the following steps: Step 1: Preheat the aramid insulating paper; Step 2: The substrate is fed into the calender and calendered under the set temperature, pressure and linear speed using a multi-stage pressure control system. Step 3: Monitor the thickness uniformity and surface quality of the aramid insulating paper in real time using an online detection system.

2. The calendering method for aramid insulating paper according to claim 1, characterized in that, In step one, the pressure range is 10-50 MPa, and the pressure is adjusted in stages, with each pressure level held for 30-60 seconds.

3. The calendering method for aramid insulating paper according to claim 1, characterized in that, In step two, the calendering temperature is controlled within the range of 150-180℃ with a temperature control accuracy of ±2℃, and the calendering speed is adjusted to 0.5-2.0m / min, and matched and optimized with the pressure and temperature parameters.

4. The calendering method for aramid insulating paper according to claim 1, characterized in that, The target thickness and density of the aramid insulating paper are determined by dividing the calendering process into at least two stages, with different linear pressures applied in each stage, and the linear pressure in the later stage is not lower than that in the earlier stage.

5. The calendering method for aramid insulating paper according to claim 1, characterized in that, The online inspection system includes a thickness measurement module, a surface defect detection module, and a real-time feedback control module.

6. The calendering method for aramid insulating paper according to claim 5, characterized in that, The surface defect detection module uses machine vision technology to automatically identify surface defects such as stripes and ripples, with a detection accuracy of 0.01mm.

7. The calendering method for aramid insulating paper according to claim 1, characterized in that, It also includes a cooling process after calendering to control the cooling temperature gradient and prevent the aramid insulating paper from deforming due to thermal stress.

8. The calendering method for aramid insulating paper according to claim 1, characterized in that, The preheating process uses a circulating hot air preheating method to ensure that the aramid insulating paper is heated evenly.

9. The calendering method for aramid insulating paper according to claim 1, characterized in that, The multi-stage pressure regulation includes three levels: the first level pressure is 10-20 MPa, the second level pressure is 25-35 MPa, and the third level pressure is 40-50 MPa.

10. The calendering method for aramid insulating paper according to claim 1, characterized in that, The process parameters of the calendering method are optimized through artificial intelligence algorithms to achieve the optimal matching of calendering speed, pressure and temperature, thereby improving the surface smoothness and thickness uniformity of aramid insulating paper.