Laminated Window Substrate with Variable Shear Modulus Film
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Laminated glass substrates face a trade-off between sound insulating properties and stiffness, as reducing glass plate thickness for weight reduction compromises sound insulation and increases deformation under static forces due to low shear modulus, making it difficult to achieve both sufficient sound insulation and stiffness.
Innovation Solution
A laminated substrate with an intermediate layer structure comprising a first region with low shear modulus for sound insulation and a second region with higher shear modulus for enhanced stiffness, where the second region's shear modulus is at least 1.40 times that of the first region, and its area ratio is optimized to maintain sound insulation while improving stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a thinner and lighter glass plate is used to reduce vehicle weight, then weight reduction is achieved, but sound insulating property is lowered
Solution Approach 1:
The patent uses a laminated glass structure composed of multiple glass plates (first and second glass plates) bonded with an intermediate film. This composite structure allows the use of thinner individual glass plates for weight reduction while maintaining overall sound insulation performance through the synergistic effect of multiple layers and the intermediate film's vibration-damping properties.
Solution Approach 2:
The intermediate film serves as a mediator between the first and second glass plates. It has specific mechanical properties (shear modulus between 0.01×10³ MPa and 10×10³ MPa) that allow it to absorb vibrations and prevent sound transmission while maintaining the structural integrity of the laminated glass, thus enabling sound insulation with thinner glass plates.
2Object-affected harmful factors
If the shear modulus of the intermediate film is reduced to improve sound insulation, then sound insulating property is enhanced, but stiffness against static force is lowered
Solution Approach 1:
The patent optimizes the shear modulus parameter of the intermediate film within a specific range (0.01×10³ MPa to 10×10³ MPa). This parameter optimization allows the intermediate film to provide sufficient vibration damping for sound insulation while maintaining adequate stiffness to prevent excessive deformation under static loads such as wind pressure or vehicle weight.
Solution Approach 2:
The laminated glass structure combines multiple glass plates with the intermediate film to create a composite material system. The glass plates provide high stiffness and structural strength, while the intermediate film provides vibration damping. This composite approach allows the system to achieve both sound insulation and sufficient stiffness that neither component could achieve alone.
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 solution effectively enhances the stiffness of laminated glass substrates while maintaining sufficient sound insulation, achieving a balance between sound transmission loss and structural integrity.
Implementation Method 1
by providing a sound insulating intermediate film with small shear modulus between two glass plates, vibration transmitted from one glass plate to the other glass plate can be absorbed; and vibrations of the two glass plates can be caused to interfere with each other by generating a phase shift between the vibrations of the two glass plates
Data Source
AI summary
Disclosed is a laminated substrate for a window, in which substrates are laminated through an intermediate layer structure, the laminated substrate includes a peripheral edge region, and a central region, wherein the intermediate layer structure includes a first region, and a second region, wherein, when a value obtained by dividing shear modulus of the second region against static force by shear modulus of the first region against the static force is denoted by x, a ratio of an area of the second region with respect to an area of the whole laminated substrate for the window is greater than or equal to (−74.87x+204.47)%, for 1.40≤x≤2.72; and greater than or equal to (−0.0067x+0.87)%, for x>2.72; and wherein a ratio of an area of the second region in the central region is less than or equal to 83%.