Screw Head Sealing with Opposed-Angle Coating Paths

The patent transitions from a single-direction spray application to a multi-dimensional approach by applying coating material from multiple angles (first angle and second angle that are not collinear). This dimensional change in application approach ensures that the coating material flows into and seals the air channels that form under the coating, eliminating the harmful effect while maintaining the protective function.

The patent applies the coating material in a specific sequence: first applying an initial layer, then applying additional coating material from different angles before the air channels fully form or while they are still open. This preliminary action of coating from multiple angles ensures that air channels are sealed before they can compromise the sealing reliability.

The patent changes the physical parameters of the coating material application by controlling the viscosity, application speed, and layer thickness. By optimizing these parameters and applying from multiple angles, the coating achieves proper sealing and adhesion much faster than traditional adhesive/sealant methods, reducing drying time from hours to a much shorter duration that allows timely leak testing.

The patent replaces the chemical-based adhesive/sealant drying process with a mechanical/fluid dynamics-based coating application method. By using controlled spray application from multiple angles, the coating material self-seals through capillary action and flow dynamics rather than relying on slow chemical drying, significantly reducing the time required before leak testing can occur.

The patent applies coating material with locally optimized properties and application parameters to specific areas around the screw heads. By targeting the coating application to the immediate vicinity of each screw head and adjusting the application angles to match the local geometry and tolerance variations, the method achieves reliable sealing even when screws are installed with large manufacturing tolerances and slight offsets.

The patent employs a dynamic coating application process where the spray direction and angles are adjusted adaptively. The first angle and second angle are selected based on the specific screw head position and orientation, allowing the coating to dynamically adapt to tolerance variations. This dynamic approach ensures that the coating material properly seals the interface between the screw head and workpiece surface regardless of manufacturing tolerances.