Reinforced Polyurethane Foam Wall Edge Strip for Window Frame Support
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Solution Overview
Problem
Conventional wall edge strips for window frames in thermal insulation composite systems create thermal insulation weaknesses while providing necessary strength for lateral support, often leading to issues like rotting and the formation of thermal bridges when made of wood, or requiring iron anchors that introduce thermal bridges when not used.
Innovation Solution
A wall edge strip made of filled, load-bearing rigid foam material based on polyurethane, with a third side surface intersecting the first and second side surfaces, featuring a through hole for fastening and surface profiling for enhanced adhesion, designed to absorb a significant portion of the window's weight without compromising thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a wall edge strip is made of wood to provide strength for lateral support, then the mechanical strength is improved, but thermal insulation performance deteriorates and the material may rot over time
Solution Approach 1:
The wall edge strip is made from rigid foam material that combines mechanical strength with thermal insulation properties. The foam material is filled with reinforcing agents (such as glass fibers, metal shavings, or hollow spheres) to enhance its load-bearing capacity while maintaining its inherent thermal insulation characteristics, thus resolving the contradiction between strength and insulation performance.
Solution Approach 2:
The density and composition parameters of the rigid foam material are adjusted to optimize both mechanical strength and thermal insulation. By controlling the foam's density (typically between 20-80 kg/m³) and adding fillers, the material achieves sufficient load-bearing capacity for lateral window frame support while preserving its thermal insulation functionality.
2Strength
If iron anchors are used to transfer load to the supporting wall, then the mechanical strength is improved, but thermal bridges are formed
Solution Approach 1:
The invention extracts and eliminates the need for separate metal anchoring elements by integrating load-bearing functionality directly into the foam-based wall edge strip itself. The reinforced foam material can directly support and transfer window frame loads to the wall without requiring iron anchors, thereby removing the source of thermal bridge formation.
Solution Approach 2:
The reinforced rigid foam material acts as an intermediary between the window frame and the supporting wall, providing both mechanical load transfer and thermal insulation in one component. This intermediary material replaces the dual-component system of metal anchors plus insulation, eliminating thermal bridges while maintaining load-bearing capacity.
3Strength
If the wall edge strip is made larger to increase strength, then the mechanical strength is improved, but the thermal insulation effectiveness is reduced
Solution Approach 1:
Instead of increasing the size of the wall edge strip, the invention enhances the material properties by using reinforced rigid foam. The composite structure with embedded fillers provides increased mechanical strength within the same dimensional constraints, avoiding any increase in thermal energy loss that would result from a larger cross-section.
Solution Approach 2:
The material's internal parameters (density, filler content, cellular structure) are modified to increase strength-to-weight ratio and strength-to-volume ratio. This allows the wall edge strip to maintain its compact dimensions for optimal thermal insulation while achieving the necessary mechanical strength through material composition optimization rather than size increase.
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 provides stable lateral support to window frames while maintaining effective thermal insulation, absorbing a major proportion of the window's weight without becoming dimensionally unstable and minimizing thermal bridges, with a thermal conductivity suitable for insulation materials.
Implementation Method 1
The wall edge strip is made of a preferably filled, load-bearing rigid foam material based in particular on polyurethane
Implementation Method 2
a surface profile with, for example, longitudinal ribs being provided on the first side surface, which promotes adhesion of an intended bonding of the wall edge strip with the wall
Data Source
Figure 1~3d
Figure 2a
Figure 2b
AI summary
The strip (1) has a first side surface (6.1) associated with a plane (E1), and a second side surface (6.2) associated with another plane (E2), where the planes intersect with each other. A third side surface (6.3) is extended in a longitudinal direction and arranged within a virtual parallelepiped (7). A through hole is designed as a stepped bore for receiving a fastening part. The through hole is vertical or approximately vertical to the first side surface. The fastening part fastens the strip at a wall. Independent claims are also included for the following: (1) a window border for a window opening of a wall construction (2) a wall construction.