Heat Generating Roller PEEK Insulation Thickness Uniformity

The patent changes the material parameter of the insulating layer from fluorocarbon resin to poly-ether-ether-ketone (PEEK) resin. This material substitution resolves the contradiction by providing both adequate electrical insulation and improved adhesion properties that enable uniform heat generating layer thickness, as PEEK resin has superior surface energy characteristics compared to fluorocarbon resin.

The patent employs a composite structure consisting of multiple layers: the PEEK resin insulating layer, the heat generating layer, and optionally a surface layer. This composite approach allows each layer to perform its specific function optimally - the PEEK layer provides insulation and adhesion, while the heat generating layer provides thermal energy, resolving the contradiction between insulation performance and layer uniformity.

The patent specifies particular parameter ranges for the PEEK resin insulating layer, including thickness of 1 μm to 10 μm and surface roughness Ra of 0.1 μm to 1.0 μm. By controlling these parameters, the patent achieves reliable adhesion and uniform heat generating layer formation while maintaining the versatility of using PEEK resin as the insulating material.

The patent applies different quality characteristics to different regions of the insulating layer. The inner peripheral surface that contacts the heat generating layer is specifically engineered with controlled roughness (Ra 0.1-1.0 μm) to optimize adhesion, while other properties of the PEEK resin maintain its electrical insulation characteristics. This local optimization resolves the contradiction between adhesion improvement and material versatility.