Stain Preventing Cover for Electrostatic Coating Machines

The patent applies composite materials by combining three different sheet materials with distinct dielectric properties in a laminated structure. The first sheet material (low dielectric constant) provides base insulation, the second sheet material (high dielectric constant or semiconductive) equalizes potential distribution, and the third sheet material (low dielectric constant) provides additional insulation layer. This composite structure resolves the contradiction by maintaining overall insulation performance while eliminating heterogeneous potential distribution that causes particle attachment.

The patent changes the dielectric constant parameter through the laminated structure of different sheet materials. By varying the dielectric constant across different layers (low-high-low), the electric potential distribution on the cover surface is normalized, transforming from heterogeneous to homogeneous distribution. This parameter change prevents the partial attaching of coating particles while maintaining insulation performance.

The patent applies preliminary action by using the stain preventing cover to prevent particle attachment before it becomes a problem. The homogeneous potential distribution achieved through the laminated structure prevents coating particles from attaching to the cover in the first place, eliminating the need for periodic cleaning operations and maintaining continuous productivity.

The cover structure performs self-service by automatically preventing particle attachment through its homogeneous potential distribution property. The laminated structure with varying dielectric constants inherently equalizes potential differences, making the cover self-maintaining without requiring external cleaning intervention or production interruption.

The patent uses composite materials with different dielectric properties arranged in a laminated structure to achieve homogeneous potential distribution. The combination of three sheet materials with varying dielectric constants (low-high-low) creates an inherent potential equalizing effect that prevents particle attachment, improving reliability while maintaining manufacturability through standard lamination processes.

The patent applies local quality by assigning different dielectric constant properties to different layers of the cover structure. Each layer has a specific dielectric characteristic optimized for its function: the first and third layers provide insulation with low dielectric constant, while the second layer provides potential equalization with high dielectric constant or semiconductivity. This localized property assignment achieves uniform potential distribution throughout the cover.