Adhesive Bonding for Window Frame Parts
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Solution Overview
Problem
The existing methods for attaching frame parts to window or door frames, such as screwing, lead to deterioration in thermal insulation, tightness, and strength, and are time-consuming and costly, with potential for water penetration and corrosion due to the capillary effect and stress peaks in the material.
Innovation Solution
Attaching frame parts to frame profiles using an adhesive material, which penetrates undercut areas and forms a cohesive connection, eliminating the need for screws and providing a sealing function to prevent water ingress and stress on the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If frame parts are attached to frame profiles using screws, then the connection strength is improved, but the thermal insulation and tightness of the frame profile deteriorate
Solution Approach 1:
The patent replaces the mechanical screw connection system with a chemical adhesive bonding system. The adhesive is applied in liquid form between the frame profile and frame part, then hardens to create a strong chemical bond that connects the components without requiring mechanical fasteners that would penetrate and compromise the frame profile's integrity.
Solution Approach 2:
The adhesive acts as an intermediary substance between the frame profile and frame part. It is applied in liquid form, penetrates into undercut areas of both components, and upon hardening creates a bonding interface that provides both mechanical strength and sealing functionality, eliminating the need for direct mechanical contact through screws.
2Strength
If screws are used to attach frame parts, then the assembly can be firmly connected, but water can penetrate via capillary effect into the interior and cause corrosion
Solution Approach 1:
The adhesive serves as a water-blocking intermediary between the external environment and the interior of the frame profile. By filling the gap and penetrating undercut areas, it creates a continuous sealing layer that prevents water from reaching the reinforcement steel profile and interior chambers through capillary action.
Solution Approach 2:
The hardened adhesive forms a flexible sealing film that conforms to the complex geometry of the joint area, including undercut regions. This film-like structure provides a continuous barrier against water penetration while accommodating thermal expansion and contraction of the bonded components.
3Reliability
If multiple screws are used per frame part, then the connection reliability is improved, but the assembly time and cost increase
Solution Approach 1:
The patent merges multiple functions into a single adhesive application process. The adhesive simultaneously provides bonding strength, sealing against water penetration, and stress distribution across the joint area. This eliminates the need for multiple separate screw fasteners and their associated drilling, countersinking, and fastening operations.
Solution Approach 2:
The mechanical screw fastening system requiring multiple fasteners per frame part is replaced with a single adhesive application process. The liquid adhesive is applied to the bonding surface, the components are joined, and the adhesive hardens to provide reliable connection, eliminating the time-consuming steps of drilling multiple holes and installing multiple screws.
4Strength
If frame parts are screwed to the frame profile, then the structural connection is achieved, but stress peaks occur causing premature material failure
Solution Approach 1:
The adhesive bond is segmented to penetrate and fill multiple undercut areas within the joint region. By distributing the bonding interface across multiple undercut zones rather than concentrating stress at discrete screw hole locations, the load is spread throughout the adhesive layer, preventing localized stress peaks that would cause premature failure.
Solution Approach 2:
The patent changes the physical state and distribution parameters of the bonding medium. The adhesive is applied in liquid form to flow into and fill undercut areas, then hardens to create a distributed solid bonding network. This transforms the stress distribution from concentrated point loads at screw locations to a distributed continuous bond across the joint area.
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 method enhances the structural integrity and water resistance of the frames, reduces assembly time and costs, and allows for easier replacement and retrofitting of frame parts without compromising the frame's functionality or material integrity.
Implementation Method 1
a frame part is attached to at least one frame profile of the sash or the frame, the frame part being bonded with an adhesive, in particular exclusively with only one Adhesive materially attached to the frame profile
Implementation Method 2
the adhesive applied in liquid form between the frame profile and the frame part penetrating at least one undercut area of the frame profile and/or at least one undercut area of the frame part
Implementation Method 3
providing a sealing function to prevent water ingress and stress on the material
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a method for manufacturing a door or window frame (100) in which a frame part (20) is attached to at least one frame profile (10) of the frame, characterized in that the frame part (20) is attached to the frame profile (10) with an adhesive, in particular exclusively with an adhesive, in a materially bonded manner and/or by means of a snap connection, in particular exclusively by means of a snap connection to the frame profile (10).