Armored Window Barrier Layers Without Frame Modification
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Solution Overview
Problem
Existing armored window systems requiring heavier polycarbonate layers necessitate modifications to the window frame for installation, which is inconvenient and potentially costly.
Innovation Solution
A ballistic assault barrier system comprising a window frame with a glass pane, fragment retention films on both sides of the glass pane, open cell foam tape, and a layer of polycarbonate adhered to the foam tape, sealed with a silicone-based sealant to fill gaps and absorb kinetic energy from projectiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heavier polycarbonate layer is used for increased protection, then ballistic protection is improved, but the window frame requires modification for installation
Solution Approach 1:
The ballistic protection system is segmented into multiple functional layers: glass pane, first fragment retention film, second fragment retention film, open cell foam tape, and polycarbonate layer. Each layer performs a specific function, allowing the system to achieve ballistic protection without requiring frame modifications. The segmentation enables the heavy polycarbonate layer to be installed as part of a modular assembly that fits within the existing frame.
Solution Approach 2:
The open cell foam tape acts as an intermediary element between the fragment retention films and the polycarbonate layer. It provides a bonding surface and structural interface that allows the polycarbonate layer to be adhered without requiring modifications to the window frame. The foam tape mediates the connection between components, enabling installation within the existing frame structure.
2Reliability
If a heavier polycarbonate layer is used for increased protection, then ballistic protection is improved, but the window frame modification is costly
Solution Approach 1:
By segmenting the protective system into multiple lightweight layers (glass, fragment retention films, foam tape, and polycarbonate), the design achieves ballistic protection without concentrating weight in a single heavy layer that would require frame modifications. This segmentation approach reduces installation costs by eliminating the need for structural changes to the window frame.
Solution Approach 2:
The system uses a composite structure combining different materials with complementary properties: glass for primary protection, fragment retention films for secondary protection and fragmentation prevention, open cell foam tape for bonding and shock absorption, and polycarbonate for ballistic resistance. This composite approach provides enhanced protection without requiring expensive frame modifications.
3Reliability
If fragment retention films and foam tape are added to the glass pane, then ballistic protection is improved, but the device complexity increases
Solution Approach 1:
The ballistic protection function is segmented across multiple layers, each with a specific role: the glass pane provides primary protection, the fragment retention films prevent glass fragmentation, the open cell foam tape provides bonding and shock absorption, and the polycarbonate layer provides ballistic resistance. This segmentation distributes the protective function across simpler, more manageable layers rather than requiring a single complex structure.
Solution Approach 2:
The system employs thin film structures (glass pane, fragment retention films, and polycarbonate layer) that can be layered together to provide comprehensive ballistic protection. These thin films are easier to install and integrate than rigid structural modifications, reducing overall device complexity while maintaining protection effectiveness.
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 system provides bullet-resistant protection without modifying the existing window frame, effectively stopping projectiles and absorbing kinetic energy, while maintaining transparency and structural integrity.
Implementation Method 1
A silicone based sealant can be applied to fill any gaps between the frame and each of the second fragment retention film, the at least one layer of foam tape, and the layer of polycarbonate
Implementation Method 2
open cell foam tape adhered to the second fragment retention film
Data Source
AI summary
An armored window system can include a window frame; a glass pane positioned in the window frame; a first fragment retention film attached to a first side of the glass pane; a second fragment retention film attached to a second side opposite the first side of the glass pane; at least one layer of foam tape adhered to the second fragment retention film; and a layer of polycarbonate adhered to the at least one layer of foam tape. A silicone based sealant can be applied to fill any gaps between the frame and each of the second fragment retention film, the at least one layer of foam tape, and the layer of polycarbonate.