Release Liner Ridge Structure for Slidability and Adhesive Force

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Solution Overview

Problem

Existing adhesive sheets with microprojections on the adhesive layer suffer from impaired slidability and inadequate adhesive force due to independent microprojections that separate and fall down during sliding, leading to reduced contact area and adhesive effectiveness.

Innovation Solution

A release liner with a surface featuring linearly extending ridge portions and recesses of varying depths, randomly formed and continuously connected, which are transferred to the adhesive layer to create protrusions and grooves, enhancing slidability and adhesive force by maintaining contact area suppression and integration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a plurality of microprojections are regularly formed on the surface of the adhesive layer, then contact between the adhesive layer and adherend is suppressed, but the microprojections separate and fall down during sliding, impairing slidability

Engineering Contradiction:

ImproveslidabilityVSAvoidstructural integrity of microprojections

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The adhesive layer is segmented into multiple microprojections that are continuously connected through a bridge portion, allowing each projection to maintain structural integrity while still providing contact suppression functionality

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The microprojections are merged through a continuous bridge portion to form an integrated structure, preventing separation and fall-down during sliding while maintaining the ability to suppress contact

Inventive Principle:

Principle #5Merging (Combining)

2Ease of operation

If the microprojections are separated and independent from each other, then alignment is easier, but the gap between microprojections is large, causing contact area spread to remain and reducing adhesive force

Engineering Contradiction:

Improvealignment easeVSAvoidadhesive force

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

Different regions of the adhesive layer have different properties: the microprojections provide local contact suppression for easy alignment, while the continuous bridge portion ensures overall structural integrity and sufficient contact area for strong adhesive force

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If the adhesive layer is in light contact with the adherend, then the adhesive sheet can be peeled and reapplied for alignment, but the microprojections fall down during sliding, reducing slidability

Engineering Contradiction:

ImproverepositionabilityVSAvoidslidability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The microprojections are pre-formed with continuous connection through the bridge portion before use, ensuring they maintain structural integrity during the sliding and repositioning operations, enabling both repositionability and maintained slidability

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250297144A1Method of producing an adhesive sheet or a release liner

Publication Date: 2025.09.25 LINTEC CORP

AI summary

A release liner which makes it difficult for an adhesive layer to impair slidability and makes it easy to exhibit an adhesive force suitably, a method of producing a release liner, an adhesive sheet, and a method of producing an adhesive sheet. A release liner has a surface provided with a ridge portion extending linearly, and on the surface, a plurality of recesses having different depths are randomly formed in a surface direction and are continuously connected.