Impact Resistant Window Polymer Film Adhesion
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Solution Overview
Problem
Conventional impact-resistant windows with safety glass and polymer interlayers often experience glass separation from the sash upon impact, leading to hazards from shattered glass debris entering the structure.
Innovation Solution
A multiple glazed window design featuring a durable transparent or translucent polymer film attached to the interior surface of panes, secured with double-sided tape to the sash, which acts as a barrier to retain broken glass shards and prevent them from entering the structure during impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a layer of durable transparent polymer is inserted between two panes of glass to make safety glass, then impact resistance and shatter resistance are improved, but the pane of glass separates from the sash upon impact, creating a hazard from shattered glass debris
Solution Approach 1:
The invention divides the protective function into two separate components: the polymer interlayer (which handles impact absorption) and the adhesive bonding system (which handles glass retention). This segmentation allows each component to specialize in its function, with the adhesive specifically designed to maintain glass-sash connection during impact events.
Solution Approach 2:
The adhesive is applied in advance to bond the glass pane to the sash before impact occurs. This preliminary bonding action ensures that when impact happens, the glass is already secured and will not separate from the sash, preventing debris hazards while maintaining the safety glass's impact resistance properties.
2Loss of energy
If double glazed windows are constructed with two panes of glass attached by a spacer, then heat transfer reduction is improved, but the weight of the window substantially increases
Solution Approach 1:
The invention replaces the traditional rigid spacer system with a thin film adhesive layer that provides the necessary separation and insulation function. This thin film approach maintains the thermal barrier properties of double glazing while dramatically reducing the overall weight compared to conventional spacer-based assemblies.
3Loss of energy
If double glazed windows are constructed with separate sealed pane units mounted into sash, then heat transfer reduction is improved, but the construction complexity increases
Solution Approach 1:
The invention merges the pane mounting function and the thermal insulation function into a single integrated adhesive system. The adhesive simultaneously bonds the glass to the sash and creates the insulated cavity, eliminating the need for separate sealed units and complex assembly procedures while maintaining effective heat transfer reduction.
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 retains broken glass debris, enhancing impact resistance and security while meeting applicable building codes for missile tests, and providing additional security protection for buildings and occupants.
Implementation Method 1
Double sided tape 14 adheres the film to a sash 16 so that the film is inhibited from pulling away from the window sash
Implementation Method 2
The film inhibits pieces or shards of glass from entering the structure if the glass is broken by an impact or a blast
Data Source
AI summary
A novel impact and blast resistant window is presented. A surface of a window pane that is adjacent to an interior of a building has a durable transparent polymer film coated or adhered thereto. The surface of a window pane that is adjacent to an interior of a building is sealed to the sash by double sided tape. The resulting window produces an unexpected ability for the durable transparent polymer film to retain pieces of broken glass driven toward the interior of the building by a missile striking an exterior of the window, without the durable transparent polymer film pulling loose from the window sash.