Transparent Peel Media for Light-Curable Adhesive Testing
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Solution Overview
Problem
Conventional peel adhesion test specimens with opaque peel media are unsuitable for light-cured adhesives and sealants, as they block light transmission, cause shadowing, and affect cure time, leading to incomplete curing and reduced adhesion properties.
Innovation Solution
The method involves using a substantially transparent peel media that allows light to pass through, enabling the light-curable material to be cured uniformly, and promoting adhesion by activating the peel media surfaces, thereby forming peel panels for testing light-curable materials with consistent adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If opaque peel media (fabric cloth, aluminum, wire mesh) is used, then the peel media can be easily handled and gripped by mechanical testing machine, but light transmission is blocked causing incomplete curing of light-cured adhesives and sealants
Solution Approach 1:
The patent applies the principle of color changes by transitioning from opaque peel media to transparent peel media. This allows light to pass through the peel media uniformly, enabling complete curing of light-cured adhesives and sealants while maintaining the structural integrity and gripability of the peel media for mechanical testing.
Solution Approach 2:
The patent changes the optical parameter (transparency) of the peel media from opaque to transparent. This parameter change resolves the contradiction by allowing light transmission for complete curing while maintaining the mechanical properties needed for handling and gripping during testing.
2Reliability
If wire mesh peel media is used to allow some light penetration, then light can reach the adhesive, but shadowing is produced that affects cure time and adhesion properties
Solution Approach 1:
The patent eliminates shadowing by changing the peel media from wire mesh (opaque with gaps) to completely transparent material. This ensures uniform light distribution across the entire adhesive area, producing consistent adhesion properties that match production environment conditions.
Solution Approach 2:
The patent applies homogeneity by ensuring uniform light transmission through the transparent peel media. The light distribution becomes homogeneous across the curing area, eliminating the shadowing effects of wire mesh and ensuring consistent cure quality and adhesion properties throughout the test specimen.
3Ease of operation
If wire mesh peel media is used, then the structure provides grip points, but the adhesive area is decreased and the wire mesh is abrasive during handling
Solution Approach 1:
The patent changes the surface characteristics of the peel media from wire mesh (abrasive, discrete grip points) to smooth transparent material. This parameter change maintains ease of handling and gripping while eliminating the abrasive effect that could contaminate or damage the test specimen and compromise test results.
4Reliability
If increased cure time is used to completely cure light-cured adhesives under wire mesh, then complete curing is achieved, but adhesion properties differ from production environment conditions
Solution Approach 1:
The patent changes the optical transmission parameter of the peel media to transparent, which restores normal light transmission conditions. This allows curing to be completed in the standard predetermined time without shadowing interference, making the test conditions representative of the production environment where no opaque materials block the light.
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
This approach allows for accurate peel-adhesion testing of light-curable materials using conventional equipment, ensuring complete curing and consistent adhesion properties, similar to production environments, while minimizing shadowing and abrasive issues associated with wire mesh.
Implementation Method 1
a substantially transparent peel media that allows light to pass through, enabling the light-curable material to be cured uniformly
Implementation Method 2
exposing the first predetermined amount of light-curable material disposed between the substrate coupon and the first surface to a light source to cure the first predetermined amount of light-curable material
Implementation Method 3
activating the first surface of the substantially transparent peel media for promoting adhesion of the light-curable material to the substantially transparent peel media
Data Source
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AI summary
A method of preparing specimens for peel-adhesion testing. The method includes applying a first predetermined amount of light-curable material to a substrate coupon, placing a first surface of a substantially transparent peel media in contact with the light-curable material disposed on the substrate coupon, where the substantially transparent peel media includes a second surface spaced from the first surface, and exposing the first predetermined amount of light-curable material disposed between the substrate coupon and the first surface to a light source to cure the first predetermined amount of light-curable material, with light from the light source passing through the substantially transparent peel media to the substrate coupon.