Laminated Auto Glass Scratching for Uniform Impact Absorption
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Solution Overview
Problem
Existing laminated glass for automobile windows has localized regions of excessively high strength, which can lead to inadequate impact absorption during collisions, compromising the bodily protection of pedestrians and cyclists.
Innovation Solution
The production method involves heating and bend-forming two glass plates, followed by bonding them with an interlayer film, and scratching the concave surface of at least one glass plate to introduce minute cracks, ensuring uniform in-plane strength distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the overall strength of the glass is reduced to eliminate high-strength regions, then bodily protection performance is improved, but the requisite toughness as automobile window glass cannot be ensured
Solution Approach 1:
The patent applies local quality by selectively reducing strength only in high-strength regions through controlled scratching, while maintaining overall glass strength. The scratching process targets specific areas with excessive strength to create micro-cracks that reduce localized strength, thereby improving pedestrian protection without compromising the overall toughness and structural integrity of the glass plate.
2Stability of the object's composition
If the in-plane strength distribution is made uniform by reducing high-strength regions, then impact absorption is improved, but the glass plate may become too weak in some areas
Solution Approach 1:
The patent applies partial action by performing scratching only in regions where strength exceeds a predetermined threshold. The scratching depth and intensity are controlled to be just sufficient to reduce localized high-strength regions to an appropriate level, avoiding excessive scratching that would compromise overall glass strength. This selective approach ensures uniform strength distribution while maintaining adequate local strength.
3Manufacturing precision
If scratching is performed to reduce high-strength region strength, then strength distribution uniformity is improved, but the glass plate strength may decrease below required levels
Solution Approach 1:
The patent implements feedback control by measuring the strength distribution of the glass plate before scratching, identifying high-strength regions, and then applying scratching only to those specific areas. The process monitors strength changes and adjusts scratching parameters to ensure that strength is reduced to an appropriate level without falling below the required minimum strength threshold for automobile window glass.
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 method produces laminated glass with uniform strength distribution, enhancing impact absorption and reducing the risk of high-strength regions, thereby improving bodily protection for pedestrians and cyclists during collisions.
Implementation Method 1
heating and bend forming two glass plates
Implementation Method 2
bonding together the two bend-formed glass plates via an interlayer film
Data Source
AI summary
A method for producing laminated glass for automobile windows includes heating and bend forming two glass plates; and bonding together the two bend-formed glass plates via an interlayer film, wherein, the method further includes scratching that is performed on a concave surface of at least one of the two glass plates, after the bend-forming.