Release Liner Ridges with Varying Recess Depths for Slidability and Adhesion

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Solution Overview

Problem

Existing adhesive sheets suffer from impaired slidability and inadequate adhesive force due to microprojections falling apart during alignment, leading to increased contact area and reduced adhesive strength over time.

Innovation Solution

A release liner with a surface featuring linearly extending ridges and recesses of varying depths, forming continuously connected protrusions on the adhesive layer, which enhances slidability and adhesive force by maintaining contact area suppression and integration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If microprojections are regularly formed on the surface of the adhesive layer to suppress contact with the adherend, then slidability is improved, but the microprojections separate and fall down during sliding, impairing slidability and reducing adhesive force

Engineering Contradiction:

ImproveslidabilityVSAvoidadhesive force

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The adhesive layer is segmented into multiple protrusions with different heights that are continuously connected, rather than separate microprojections. This segmentation allows the protrusions to maintain structural integrity during sliding while still providing contact suppression, resolving the contradiction between slidability and adhesive force reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the adhesive layer surface have different properties through the continuous protrusions of varying heights. The continuous connection provides structural stability for slidability, while the varying heights create localized contact points that maintain adhesive force, simultaneously addressing both requirements

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If microprojections are formed to allow light contact and repositioning, then alignment flexibility is improved, but the contact area spread stays and adhesive force becomes less likely to be exhibited suitably

Engineering Contradiction:

Improvealignment flexibilityVSAvoidadhesive force

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The adhesive layer structure transitions dynamically during application: initially providing light contact through protrusions for alignment flexibility, then achieving firm adhesion as the protrusions settle and maximize contact area, resolving the contradiction between alignment flexibility and adhesive strength

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The continuous protrusions are pre-formed to facilitate initial alignment through light contact, and then automatically transition to a state of maximized contact area for firm adhesion, eliminating the need for manual intervention and ensuring both alignment flexibility and subsequent adhesive strength

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12351749B2Method of producing an adhesive sheet or a release liner

Publication Date: 2025.07.08 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.