Adhesive Sheet for Spectacle Lens Edging Misalignment
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Solution Overview
Problem
The existing edging process for spectacle lenses is complicated due to the requirement of additional working processes for preventing axial misalignment, which can be addressed by using a single adhesive sheet with specific structural components to securely fix the lens in an edging machine.
Innovation Solution
An adhesive sheet comprising a base material layer with elastic properties and an adhesive layer containing a (meth)acrylic ester-based polymer, a tackifier resin, and a cross-linking agent, which is designed to provide excellent adhesive strength and conform to the lens surface, eliminating the need for a lens lock tape and simplifying the edging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive tape with excellent adhesive strength is attached to the lens surface, then the lens can be securely held during edging, but the edging process becomes more complicated due to additional working processes
Solution Approach 1:
The patent combines the adhesive layer and base material layer into a single integrated adhesive sheet structure. The adhesive layer containing (meth)acrylic ester-based polymer, tackifier resin, and cross-linking agent is directly coated on the base material layer, eliminating the need for separate adhesive tapes and lens lock tapes. This merging of components simplifies the edging process while maintaining reliable lens holding stability.
Solution Approach 2:
The adhesive sheet serves multiple functions simultaneously: it provides adhesive bonding to hold the lens, offers mechanical support through the base material layer, and eliminates the need for additional lens lock tape. This multi-functional design reduces the number of separate components and working processes required, thereby simplifying the overall edging process.
2Reliability
If a lens lock tape is attached on the adhesive tape, then the lens can be prevented from slipping, but the number of components and working processes increases
Solution Approach 1:
The patent merges the functions of the adhesive tape and lens lock tape into a single adhesive sheet structure. The base material layer provides the structural support and mechanical properties, while the adhesive layer provides the bonding function, eliminating the need for separate lens lock tape component and reducing the number of working processes.
Solution Approach 2:
The adhesive sheet uses a composite structure combining the base material layer and adhesive layer with specific chemical compositions. The adhesive layer contains (meth)acrylic ester-based polymer, tackifier resin, and cross-linking agent to create a composite material that provides both structural integrity and strong adhesive bonding, replacing the need for multiple separate components.
3Strength
If the adhesive layer contains cross-linking agent, then the adhesive strength is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent optimizes the parameters of the adhesive layer by specifying precise composition ratios: (meth)acrylic ester-based polymer as the main ingredient, tackifier resin in controlled amounts, and cross-linking agent to achieve optimal adhesive strength. By carefully controlling these parameters, the adhesive layer achieves enhanced bonding while maintaining feasibility in the manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The adhesive sheet effectively prevents axial misalignment of spectacle lenses during the edging process, allowing for precise and simplified lens shaping without the need for additional tapes, thereby enhancing the edging process efficiency at retail shops.
Implementation Method 1
an adhesive layer (2b1) formed of an adhesive composition containing a (meth)acrylic ester-based polymer, a tackifier resin and a cross-linking agent
Implementation Method 2
a base material layer (2a) which includes a sheet member (2a2) formed of a resin foam and having an elasticity
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
In an adhesive sheet (2), a first coating layer (2b1) as an adhesive layer is provided to a portion of the adhesive sheet (2) that faces a lens surface. Since the adhesive layer is formed of an adhesive composition containing a (meth)acrylic ester-based polymer, a tackifier resin, and a cross-linking agent, a lens having small friction coefficient and having a surface treated with a fluorine-containing silane compound or the like can be effectively prevented from an axial misalignment due to excellent adhesive strength.