Laminated Glazing Support Sheet Adhesive Integrity
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Solution Overview
Problem
In vehicle side windows, the integrity of the adhesive interlayer material joining the inner and outer glass sheets can be compromised during breakage of the outer sheet, leading to potential detachment and injury risks.
Innovation Solution
A laminated glazing design featuring a support sheet between two layers of adhesive interlayer material, where the first layer is between the first glass sheet and the support sheet, and the second layer is between the second glass sheet and the support sheet, maintaining the integrity of the glazing upon breakage by supporting the adhesive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single layer of adhesive interlayer material is used to join the inner and outer glass sheets, then the device complexity is reduced, but the reliability is compromised because the integrity of the adhesive interlayer material can be compromised during breakage of the outer sheet
Solution Approach 1:
The interlayer assembly is segmented into multiple functional layers: a first adhesive interlayer material layer joining the outer glass sheet to the support sheet, and a second adhesive interlayer material layer joining the inner glass sheet to the support sheet. This segmentation allows each layer to independently maintain integrity and prevent glass sheet detachment during breakage events.
Solution Approach 2:
A support sheet is introduced as an intermediary element between the inner and outer glass sheets. The support sheet acts as a mediator that distributes and absorbs impact forces, preventing direct stress concentration on the adhesive interlayer materials and maintaining their integrity during breakage events.
2Reliability
If the inner facing sheet only covers the aperture portion of the vehicle, then the weight is reduced, but the reliability deteriorates because the integrity of the adhesive interlayer material may be compromised during breakage
Solution Approach 1:
The glazing system is segmented into two glass sheets of different thicknesses: a thicker outer glass sheet (first sheet) that provides primary structural strength and breakage resistance, and a thinner inner glass sheet (second sheet) that reduces weight. The support sheet and dual adhesive layers ensure that even if the thinner inner sheet breaks, the overall integrity is maintained.
Solution Approach 2:
Different regions of the glazing system are assigned different qualities: the outer glass sheet has higher thickness and strength for external impact resistance, while the inner glass sheet has reduced thickness for weight savings. The support sheet provides localized reinforcement at critical stress points where the adhesive layers join the glass sheets.
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 design ensures that both glass sheets remain attached to the interlayer structure during breakage, preventing detachment and enhancing safety by maintaining the structural integrity of the laminated glazing.
Implementation Method 1
a first sheet of glass joined to a second sheet of glass by an interlayer structure therebetween... the interlayer structure comprising at least a first layer of adhesive interlayer material, a second layer of adhesive interlayer material and a support sheet
Data Source
AI summary
A laminated glazing comprising first and second sheets of glass joined together by an interlayer structure comprising at least first and second layers of adhesive interlayer material with a support sheet therebetween is disclosed. The laminated glazing is arranged such that the first layer of adhesive interlayer material is between the first sheet of glass and the support sheet, the second layer of adhesive interlayer material is between the second sheet of glass and the support sheet support material and at least a portion of the second major surface of the first sheet of glazing material faces the first major surface of the second sheet of glazing material. In the event of breakage of the first sheet of glass, the second layer of adhesive interlayer material remains attached to the support sheet thereby keeping the second glass sheet from becoming detached from the laminated glazing.