Adhesive Sheet Non-Uniform Grooves Air Escape

The patent applies local quality by creating grooves with non-uniform width where the width varies along the groove length. Specifically, the groove width is smaller at certain sections and larger at other sections, allowing different parts of the same groove to serve different functions: narrower sections facilitate air escape while wider sections maintain adhesion strength. This local variation in groove geometry resolves the contradiction between air venting and adhesion preservation.

The non-uniform groove width design ensures that only specific sections of the groove have larger width for effective air escape, while other sections maintain smaller width to preserve substrate surface integrity. This localized variation prevents excessive substrate denting while still providing adequate air venting channels.

By varying the groove width along its length, the patent creates zones of different adhesion characteristics. The narrower sections maintain stronger adhesion while the wider sections provide air escape paths. This local differentiation allows the groove structure to provide air venting functionality without creating large areas of weak adhesion that would compromise overall bonding performance.