Vehicle Glazing Unit with Segmented Sealing Strip Design
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Solution Overview
Problem
Existing pane units for vehicle windows require complex and costly tightness tests during production, and the application of primers or adhesion promoters often results in optical impairments due to protrusions during the overmoulding process.
Innovation Solution
A pane unit design where the primary part is molded only on the inside of the pane, and the secondary part, which is more flexible, surrounds the primary part on the outside and is attached using a primer or adhesion promoter, eliminating the need for complex tests and ensuring tightness without visible primer protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a primer or adhesion promoter is applied precisely on the outside of the pane before overmoulding, then the adhesion of the secondary part to the pane is improved, but the primer may protrude due to tolerances causing optical impairment and requiring manual reworking
Solution Approach 1:
The patent introduces a third component (primer or adhesion promoter) as an intermediary substance between the secondary part and the pane. This mediator ensures reliable adhesion of the secondary part to the pane while being contained within the molding cavity, preventing protrusion issues and eliminating the need for manual reworking.
2Reliability
If tightness tests (Kärcher test, water column test) are performed during production, then the sealing quality is verified, but the production process becomes time-consuming and costly
Solution Approach 1:
The patent designs the frame and sealing components to inherently provide tightness through their structural design and material properties. The frame profile with integrated sealing elements and the overmoulded secondary part create a self-sealing structure that guarantees tightness without requiring external verification tests, thereby eliminating time-consuming and costly production tests.
3Shape
If the primary part is molded onto the outside of the pane, then the frame structure is complete, but the primer application becomes complex and visible protrusions occur
Solution Approach 1:
The patent divides the frame into two distinct components: a primary part (hard component) and a secondary part (soft component). The primary part is molded only on the inside of the pane, while the secondary part is overmolded on the outside. This segmentation allows the primer to be applied only where necessary for adhesion, preventing visible protrusions while maintaining complete frame structure.
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 design achieves a sealed arrangement without the need for costly tightness tests, improves soundproofing, and allows for flexible adaptation of the frame components, while minimizing thermal impact on the pane and enabling easier recycling.
Implementation Method 1
the secondary part, which at least partially surrounds the primary part and on the outside of the pane directly against the pane is attached to the pane with a primer or adhesion promoter
Data Source
Figure 1
Figure 2~3
AI summary
The disc unit (10) has frame (11) that is arranged on two circumferential sides of disc plate (12). Two profile portions are formed in frame. The strength of primary profile portion with hard component is greater than that of secondary profile portion with soft component. The primary profile portion is injection-molded at the edge region of disc plate. The primer is formed on the disc plate with respect to the secondary profile portion which partially surrounds primary profile portion.