Laminated Glass Interlayer Film Structure for Color Migration Control
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Solution Overview
Problem
Conventional interlayer films with colored regions are prone to color migration when stored in an overlapped condition, which affects the appearance of laminated glass.
Innovation Solution
The interlayer film is designed with a colored region having a parallel light transmittance of less than 60% and a transparent region with 60% or more, featuring an average thickness difference of 10 µm or more between the colored and transparent regions, and includes surface protrusions and recesses with a maximum ten-point average roughness of 9 µm or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an interlayer film with a colored region is stored in an overlapped condition, then the interlayer film can be stored efficiently, but color migration occurs in the contact part
Solution Approach 1:
The invention introduces a thickness dimension variation to solve the color migration problem. By making the colored region thinner than the transparent region (thickness difference ≥ 10 μm), the patent creates a three-dimensional structural solution that prevents color contact during overlapped storage, while maintaining the two-dimensional coloration function when installed.
Solution Approach 2:
The patent applies different thickness qualities to different regions of the interlayer film. The colored region has a smaller average thickness compared to the transparent region, creating local structural differentiation that prevents color migration while preserving the desired optical properties in each region.
2Illumination intensity
If the colored region has high color intensity (low light transmittance), then the light shielding property is improved, but the risk of color migration increases
Solution Approach 1:
The patent changes the physical parameter of thickness to control color migration. By reducing the thickness of the colored region to be at least 10 μm thinner than the transparent region, the patent modifies the physical structure to prevent harmful interactions during storage, while maintaining sufficient color intensity for light shielding when installed.
Data Source
Figure 1~3
Figure 4(a)~4(b)
AI summary
Provided is an interlayer film for laminated glass capable of suppressing color migration. In an interlayer film for laminated glass according to the present invention, when the interlayer film is arranged between two sheets of clear glass conforming to JIS R3202:1996 to obtain a laminated glass X, and parallel light transmittance is measured for the obtained laminated glass X, the interlayer film has a colored region with a parallel light transmittance of less than 60%, and a transparent region with a parallel light transmittance of 60% or more, the interlayer film has an average thickness in the colored region smaller than an average thickness in the transparent region, and the interlayer film has an absolute value of difference between the average thickness in the colored region and the average thickness in the transparent region of 10 um or more.