Laminate Adhesion Control for Precise Peeling Sequences
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Solution Overview
Problem
Existing laminates used in optical members often result in unintended peeling orders due to differences in adhesion strengths between layers, where the member with lower adhesion strength is peeled off first, contrary to the desired sequence.
Innovation Solution
A laminate configuration where the adhesion strength in the outer peripheral portion between the second and third members is higher than the adhesion strength between the first and second members, allowing for controlled peeling by adjusting the positions and strengths of pressure-sensitive adhesive layers and release layers, ensuring the first member is peeled off before the third member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a laminate is constructed with members bonded in sequence, then the structure is simple and easy to manufacture, but the peeling order becomes uncontrollable and follows the path of least adhesion strength rather than the desired sequence
Solution Approach 1:
The patent applies local quality by creating different adhesion strength characteristics in different regions of the laminate. Specifically, the adhesion strength between the first and second members is designed to be uniformly distributed, while the adhesion strength between the second and third members is made non-uniform with higher strength at the center portion and lower strength at the outer peripheral portion. This local differentiation of adhesion properties enables controlled peeling order while maintaining simple lamination construction.
2Strength
If the adhesion strength between the second and third members is increased uniformly across the entire contact surface, then the bond is stronger, but the third member peels off first during the peeling process, reversing the desired peeling sequence
Solution Approach 1:
The patent resolves this contradiction by making the adhesion strength between the second and third members non-uniform rather than uniformly high. The center portion of the contact surface has high adhesion strength to prevent premature peeling, while the outer peripheral portion has deliberately reduced adhesion strength. This local quality differentiation ensures that peeling initiates at the outer periphery and propagates inward, allowing the first member to be peeled off first in the desired sequence while maintaining overall bond strength.
3Strength
If the adhesion strength between the first and second members is increased, then the bond is stronger, but it becomes difficult to peel off the first member before the third member, compromising the desired peeling sequence
Solution Approach 1:
The patent applies parameter changes by carefully controlling the adhesion strength parameter between the first and second members. The adhesion strength C1 is designed to be within a specific range that balances two requirements: it must be sufficiently strong to maintain structural integrity during handling and assembly, but not so strong that it prevents the first member from being peeled off first. This optimized parameter selection enables both adequate bond strength and controllable peeling sequence.
Data Source
AI summary
An object of the present invention is to provide a laminate where members can be peeled off in a desired peeling order, a method of manufacturing the laminate, and a method of manufacturing an optical member. The laminate according to the present invention includes, in the following order: a first member; a second member; and a third member, in which in a case where an adhesion strength in a contact surface between the first member and the second member is represented by C1, an adhesion strength in a center portion of a contact surface between the second member and the third member is represented by C21, and an adhesion strength in at least a part of an outer peripheral portion positioned outside the center portion of the contact surface between the second member and the third member is represented by C22, a requirement of Expression (1) is satisfied, Expression (1) C22>C1>C21.