Polymeric Stiffening Profile for Window Frames
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polymeric window profiles face challenges in meeting mechanical requirements while maintaining thermal insulation, as existing stiffening solutions like metal profiles create thermal bridges and are labor-intensive, and aesthetically unappealing external reinforcements are not acceptable to consumers.
Innovation Solution
A polymeric stiffening profile with a tensile modulus of at least 5 GPa, embedded with reinforcement materials like metal rods or fibers, is applied to an unexposed side of the construction profile, providing reinforcement without compromising thermal insulation and is aesthetically acceptable as it remains hidden from view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal stiffening profile is inserted into a stiffening chamber of the polymeric frame, then the mechanical strength is improved, but the thermal insulation deteriorates due to thermal bridge formation
Solution Approach 1:
The invention uses a composite stiffening profile consisting of a polymeric base material combined with reinforcement elements (fibers, rods, or a polymeric foam core). This composite structure provides the necessary mechanical strength while maintaining thermal insulation properties, as the polymeric materials used have low thermal conductivity similar to the frame profile.
Solution Approach 2:
The invention changes the material parameters by selecting polymeric materials with specific properties: tensile modulus of at least 5 GPa for adequate stiffness, and thermal conductivity of maximum 2 W/mK for thermal insulation. This parameter optimization allows achieving both mechanical strength and thermal insulation without metal components.
2Strength
If a stiffening chamber is designed for each polymeric profile model, then the mechanical requirements are met, but the device complexity increases due to varying geometries
Solution Approach 1:
The stiffening profile is designed as a universal component that can be applied to multiple different polymeric profile models. The standardized geometry and attachment mechanism allow the same stiffening profile design to work across various frame models, eliminating the need for model-specific stiffening chambers and simplifying manufacturing and inventory management.
Solution Approach 2:
The invention separates the stiffening function from the structural profile by using an independent, attachable stiffening profile. This segmentation allows the stiffening component to be designed once and reused across different applications, while the main profile geometry can vary without requiring custom stiffening solutions for each model.
3Strength
If an external metal profile is clipped to the polymeric frame for reinforcement, then the mechanical strength is improved, but the aesthetic appearance deteriorates
Solution Approach 1:
The invention changes the material appearance parameters by using polymeric materials for the stiffening profile that match the aesthetic properties of the main frame profile. The polymeric material can be colored and finished to blend with the frame, making the reinforcement invisible or aesthetically acceptable, unlike metal profiles which are visually apparent.
4Strength
If stiffening profiles are inserted during production, then the mechanical strength is improved, but the productivity decreases due to labor-intensive installation
Solution Approach 1:
The stiffening profile is designed to be pre-fabricated with attachment features (clips, snap-fit mechanisms, or mounting elements) that enable quick installation. This preliminary preparation of the stiffening component allows for rapid attachment to the frame profile, reducing installation time and labor requirements compared to traditional insertion methods.
Solution Approach 2:
The invention employs dynamic or flexible attachment mechanisms that allow the stiffening profile to be easily connected and disconnected. This may include snap-fit connections, clips, or other mechanical fasteners that enable quick installation without complex tools or procedures, thereby improving production efficiency.
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 enhances the mechanical rigidity of polymeric window profiles without detrimental effects on thermal insulation, is cost-effective, and can be applied post-fabrication, addressing the limitations of existing stiffening methods.
Implementation Method 1
the polymer material having a lambda value of maximum 2 W/mK
Data Source
Figure 1a~1b
Figure 2~4
Figure 5a~5b
AI summary
A construction profile made of polymeric material and defining an inner cavity, the construction profile having an outer surface comprising unexposed side portions and exposed side portions, whereby a stiffening profile is provided external of said construction profile and at an unexposed side portion thereof, characterised in that said stiffening profile comprises a polymer material and a reinforcement material, the stiffening profile having a tensile (flexural) modulus in its length (L) direction of at least 5 GPa according to EN2561 and the polymer material having a lambda value of maximum 2 W/mK.