UV-Cut Lamination Adhesive Transmittance to Prevent Smear and Peeling
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Solution Overview
Problem
Existing methods for cutting laminated structures using ultraviolet light often result in smear and peeling off of layers, particularly when a gas barrier material is involved, leading to inefficiencies and potential damage during the cutting process.
Innovation Solution
A device and method that control the ultraviolet transmittance of an adhesive agent layer between a substrate and a protective layer, with the adhesive agent layer having an ultraviolet transmittance of 30% or less at 355 nm, and the protective layer having a transmittance of 70% or less, ensuring a difference of 13% or less between the two layers, using adhesives like epoxy and urethane, and incorporating an ultraviolet absorber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ultraviolet light laser is used for cutting a lamination structure including a substrate, protective layer, and adhesive agent layer, then precise cutting is enabled, but smear and peeling off of layers occur due to cutting starting from the inner layer
Solution Approach 1:
The patent changes the optical parameter (ultraviolet transmittance) of the adhesive agent layer by selecting specific materials and controlling thickness to optimize the cutting process. By adjusting the ultraviolet transmittance to be 10% or more but less than 30%, the adhesive layer allows sufficient UV light transmission to melt the protective layer cleanly while preventing excessive light transmission that would cause inner layer cutting and subsequent smear and peeling.
Solution Approach 2:
The patent applies different ultraviolet transmittance characteristics to different layers of the lamination structure. The adhesive agent layer is specifically designed with controlled UV transmittance (10-30%) that differs from the protective layer and substrate, creating localized optical properties that enable clean cutting at the protective layer interface without affecting the inner layers.
2Manufacturing precision
If a lamination structure with gas barrier material is cut by ultraviolet light, then cutting is achieved, but gas accumulation occurs in the inner layer causing bubbles and peeling
Solution Approach 1:
The patent controls the ultraviolet transmittance parameter of the adhesive agent layer to create an optimal cutting condition where UV light is absorbed sufficiently at the protective layer-adhesive layer interface to enable clean cutting, while preventing light transmission deep enough to cause gas generation and accumulation in gas barrier layers and inner structures.
3Productivity
If the ultraviolet transmittance of the adhesive agent layer is increased to allow better light transmission, then cutting efficiency improves, but smear and peeling occur due to inner layer cutting
Solution Approach 1:
The patent identifies and controls the critical parameter of ultraviolet transmittance in the adhesive agent layer, establishing an optimal range (10-30%) that balances cutting efficiency with quality. This parameter optimization enables sufficient light transmission for efficient cutting while preventing excessive transmission that would melt inner layers and cause smear and peeling defects.
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 effectively suppresses smear and peeling, enabling efficient cutting with good cut portions and power generation characteristics, reducing damage risk and improving production efficiency and cost-effectiveness for devices like displays and sensors.
Implementation Method 1
the adhesive agent layer has an ultraviolet transmittance of 30% or less at a wavelength of 355 nm
Implementation Method 2
a laser beam irradiating unit that irradiates a laser beam for cutting the protective layer and the adhesive agent layer
Implementation Method 3
precise cutting is enabled but the cutting starts from an inner layer of the lamination structure
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
AI summary
An object of the present invention is to provide a device and the like that can suppress occurrence of a smear and peeling off of a layer when a laminated structure including a substrate, a protective layer, and an adhesive agent layer between the substrate and the protective layer is cut by ultraviolet light. The present invention relates to a device 10, etc. that has a substrate 14, a protective layer 11, and an adhesive agent layer 15 located on the protective layer 11, between the substrate 14 and the protective layer 11, and in which the ultraviolet transmittance of the adhesive agent layer 15 is 30% or lower on wavelength of 355 nm.