Wavy Groove PSA Sheet for Air Release and Edge Peel Prevention

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Solution Overview

Problem

Conventional pressure-sensitive adhesive (PSA) sheets often degrade the appearance of adherends due to trapped air and moisture, leading to decreased adhesive strength and uneven application, especially near the edges, which complicates automated application.

Innovation Solution

An air-impermeable PSA sheet with a wavy groove pattern on its adhesive surface, designed to release foreign fluids and maintain uniform adhesiveness, preventing edge peel and enhancing ease of application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If grooves are formed in the adhesive surface to release trapped air, then appearance degradation is prevented, but adhesive strength decreases near the edges

Engineering Contradiction:

Improvetrapped airVSAvoidadhesive strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The grooves are designed with curved, wavy patterns instead of straight lines. This curvature allows the grooves to effectively channel trapped air outward while distributing the adhesive interruption more evenly across the sheet, preventing concentration at edges and maintaining overall adhesive strength.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The groove pattern uses asymmetric positioning and varying spacing, particularly with grooves positioned at different distances from edges and intersecting at angles. This asymmetric design prevents uniform distribution of adhesive interruption that would otherwise concentrate weakness at edge regions.

Inventive Principle:

Principle #4Asymmetry

2Object-affected harmful factors

If grooves run in parallel with the edge to release air, then air release is effective, but edge peel occurs due to decreased adhesiveness

Engineering Contradiction:

Improvetrapped airVSAvoidedge adhesion

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

Grooves are deliberately positioned at angles to the sheet edges rather than running parallel, creating asymmetric placement that prevents concentrated adhesive interruption at edge regions. This maintains adhesive integrity at critical edge zones while preserving air release functionality.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The curved, wavy groove paths naturally intersect edges at varying angles rather than running parallel, distributing the adhesive interruption away from edge regions and preventing edge peel while maintaining effective air release channels.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Object-affected harmful factors

If the adhesive surface is made uneven with grooves to release air, then air release improves, but application uniformity deteriorates

Engineering Contradiction:

Improvetrapped airVSAvoidapplication uniformity

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The continuous wavy groove pattern creates a more gradual and distributed surface profile compared to straight grooves. This curved geometry distributes the adhesive interruption more evenly across the sheet, resulting in more uniform application characteristics while maintaining effective air release pathways.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS9902878B2Pressure-sensitive adhesive sheet

Publication Date: 2018.02.27 NITTO DENKO CORP

AI summary

This invention provides a PSA sheet with which degradation of the appearance after its application is efficiently prevented while showing uniform adhesive properties over the entire sheet with greater ease of application. The PSA sheet provided by this invention is an air-impermeable PSA sheet having an adhesive surface. The PSA sheet comprises a PSA layer forming the adhesive surface. In the adhesive surface, at least one groove is formed. The groove runs in a wavy shape in the adhesive surface.