Temporary Fluorinated Coating for Lens Edging Adhesion
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Solution Overview
Problem
The challenge in edging ophthalmic lenses with anti-fouling top coats is the slippage caused by low surface energy, leading to misalignment and difficulty in inserting the lenses into frames, due to the hydrophobic and oleophobic coatings that reduce adhesion between the lens and the edging machine's chuck.
Innovation Solution
A temporary organic layer with a fluorinated functional moiety and a linking functional moiety is applied to the lens, forming a temporary coating that increases the surface energy and improves adhesion to the holding pad, allowing for stable edging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-fouling top coat is applied to the lens to reduce staining and improve cleanliness, then the lens becomes hydrophobic and oleophobic, but the surface energy is reduced causing slippage during edging operations
Solution Approach 1:
A temporary adhesive layer is applied to the lens surface before edging operations to pre-establish adequate adhesion. This preliminary action counteracts the low surface energy effect during the critical edging process, allowing the lens to be securely held without compromising the permanent anti-fouling coating.
Solution Approach 2:
The temporary adhesive layer acts as an intermediary between the low-surface-energy anti-fouling coating and the holding pad. This intermediate layer provides the necessary adhesion during edging while being removable afterward, thus mediating between the conflicting requirements of stain resistance and holding stability.
2Ease of manufacture
If the lens surface is made hydrophobic to prevent adhesion of fatty deposits, then cleaning becomes easier, but adhesion to the holding pad during edging becomes difficult
Solution Approach 1:
The temporary adhesive layer is applied in advance to compensate for the hydrophobic effect during edging operations. This preliminary measure ensures proper alignment and positioning of the lens on the holding pad before the precision edging process begins, without affecting the permanent cleaning properties.
Solution Approach 2:
A temporary, disposable adhesive layer is used during the edging process and then removed. This short-living adhesive provides the necessary adhesion for precision work but is discarded afterward, leaving the permanent hydrophobic coating intact for easy cleaning.
3Reliability
If a holding pad with adhesive is used to secure the lens during edging, then lens slippage is prevented, but the adhesive may not bond to the low surface energy hydrophobic surface
Solution Approach 1:
The temporary adhesive layer serves as a mediator between the holding pad adhesive and the hydrophobic lens surface. It creates a compatible interface that allows the holding pad to securely grip the lens during edging operations, overcoming the adhesion problem caused by low surface energy.
Solution Approach 2:
The solution uses a composite approach with multiple adhesive layers having different properties. The temporary layer is specifically designed to bond to hydrophobic surfaces, while the permanent anti-fouling layer maintains its stain-resistant properties. This composite structure resolves the adhesion conflict.
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 temporary coating effectively prevents lens slippage during edging, maintaining optical axis alignment and enabling successful frame insertion, with the ability to be easily removed without degrading the anti-fouling top coat.
Implementation Method 1
A temporary organic layer with a fluorinated functional moiety and a linking functional moiety is applied to the lens, forming a temporary coating that increases the surface energy and improves adhesion to the holding pad
Implementation Method 2
fixing the optical article to a chuck by means of a holding pad inserted there between and adhering to both the optical article and the chuck
Data Source
AI summary
Methods for edging optical articles comprising two main faces, at least one of which being coated with an outermost layer comprising fixing the optical article to a chuck with a holding pad that adheres to both the optical article and the chuck, wherein the surface of the holding pad contacting the optical comprises an adhesive material; and edging the optical article with an edging device; wherein prior to fixing the optical article to the chuck, at least one temporary layer of an organic material is formed onto said outermost layer of the optical article, the organic material of the temporary layer comprising at least one organic compound having a fluorinated functional moiety and at least one linking functional moiety capable of establishing at least one intermolecular bond or interaction with the adhesive material of the holding pad. Optical articles obtained via these methods.