Laminated Glazing with Interlayer Bird Protection Pattern for Glass Adhesion
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Solution Overview
Problem
Existing bird-safe glazing technologies face issues with adhesion problems between interlayers and glass surfaces due to bird protection patterns, leading to reduced optical quality and economic value, and are costly and inflexible in production.
Innovation Solution
A laminated glazing design with a bird protection pattern sandwiched between thermoplastic interlayers, using polyvinyl acetal, and incorporating UV-blocking agents to improve adhesion and optical quality, while being visible to birds but not humans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a bird protection pattern is printed or coated onto the surface of the thermoplastic interlayer, then bird collision prevention is improved, but adhesion between the interlayer and glass surface deteriorates
Solution Approach 1:
The bird protection pattern is moved from the outer surface of the interlayer (where it contacts glass) to the inner surface, sandwiched between the interlayer and the second interlayer. This spatial repositioning in another dimension allows the pattern to maintain bird visibility while eliminating interference with glass adhesion on the outer surface.
Solution Approach 2:
A second thermoplastic interlayer is introduced as an intermediary between the bird protection pattern and the glass surface. This intermediary layer allows the pattern to be positioned close to the glass for bird visibility while preventing direct contact that would cause adhesion problems, thus mediating between the conflicting requirements.
2Object-affected harmful factors
If a bird protection pattern is printed or coated onto the surface of the thermoplastic interlayer, then bird collision prevention is improved, but optical quality deteriorates
Solution Approach 1:
The pattern is repositioned to the inner surface of the interlayer, away from the glass interface. This dimensional change allows the pattern edges to be sharper and more defined without the blurring effect that occurs when the pattern is in direct contact with the glass surface, thereby improving optical quality while maintaining bird collision prevention.
3Object-affected harmful factors
If enamel printing is used to apply bird protection pattern directly onto glass surface, then bird collision prevention is improved, but production cost and process complexity increase
Solution Approach 1:
The bird protection pattern is extracted from the glass surface and transferred to the thermoplastic interlayer. This extraction allows the use of more flexible and cost-effective printing or coating techniques on the interlayer material, avoiding the high temperatures and complex processes required for enamel printing on glass, thereby reducing production cost and simplifying manufacturing.
Solution Approach 2:
The substrate for the bird protection pattern is changed from glass to thermoplastic interlayer. This parameter change enables the use of lower temperature and more flexible printing/coating processes, reducing production costs and simplifying manufacturing while maintaining the bird collision prevention function.
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
Enhances adhesion, maintains optical clarity, and reduces pattern fading, providing effective bird deterrence with improved stability and processibility.
Implementation Method 1
fading or deterioration of the pattern from an exposure to sunlight can be reduced by using a UV-blocking agents present in the two interlayer films on both sides of the pattern
Implementation Method 2
the bird protection pattern has a transparency for light in the range from 380 to 750 nm of more than 50% and comprises a UV absorber or a UV reflective agent
Data Source
AI summary
The invention is directed to laminated glazing comprising two glass sheets laminated by means of at least two thermoplastic interlayers wherein at least one surface of one of the interlayers is provided with a bird protection pattern in between the two thermoplastic interlayers and wherein at least one thermoplastic interlayer comprises a polyvinyl acetal.