Electrical insulating cardboard production workshop

As the core facility for manufacturing high-reliability insulating materials, the environmental control and process management in this workshop directly determine product performance. The workshop adopts a fully enclosed structural design, with its walls and floors coated with anti-static epoxy resin. It is equipped with an independent fresh air system and positive pressure protection devices, achieving an air cleanliness level of ISO 7 (Class 100 cleanroom standard), effectively eliminating the impact of dust particles on the breakdown voltage of the paperboard. Temperature and humidity are strictly regulated by an intelligent environmental control system, with temperature fluctuations controlled within ±1℃ and relative humidity maintained between 45% and 55%, preventing paper deformation due to moisture absorption or drying and ensuring thickness uniformity and electrical stability.

The production process adheres to standardized process specifications, with 12 key control points set from raw material proportioning to finished product inspection. High-purity unbleached sulfate wood pulp is selected as the raw material, which is fully dispersed by a pulper and then passed through a multi-stage screening system to remove impurities and coarse fibers. The uniformity of fiber length and distribution directly affects the mechanical strength of the paperboard. In the papermaking stage, inclined wire forming technology is employed, combined with vacuum dewatering and multi-roll pressing processes, ensuring that the thickness deviation of the formed paperboard is controlled within ±0.02 mm. The drying section adopts a segmented temperature-controlled hot air circulation system to gradually remove moisture while preventing paper brittleness, maintaining a stable moisture content of 3%-5% in the product.

To enhance insulating performance, the paperboard undergoes impregnation and heat treatment processes. The impregnation tank is filled with high flame-retardant epoxy resin, and through vacuum pressure impregnation, the resin fully penetrates the fiber gaps. After curing, a dense insulating layer is formed, with a withstand voltage rating exceeding 20 kV/mm. The heat treatment furnace utilizes infrared heating and nitrogen protection technology to eliminate internal stresses and improve material thermal stability, ensuring that the paperboard maintains stable performance in harsh environments ranging from -55℃ to 155℃.

In the quality inspection stage, fully automatic detection equipment is deployed, including laser thickness gauges, high-voltage breakdown testers, and dielectric constant testers, conducting ** sampling inspections on each batch of products, with data uploaded to the production management system in real-time. The workshop also has an independent laboratory capable of simulating complex working conditions such as high temperature, high humidity, and salt spray to conduct accelerated aging tests on the paperboard, verifying its long-term reliability. Through strict environmental control and process management, the insulating paperboard produced in this workshop is widely used in electrical equipment such as transformers, capacitors, and motors, providing a fundamental guarantee for the safe transmission of electrical energy.