Vehicle Sealing Strip with Separating Layer for Clean Detachment
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Solution Overview
Problem
Existing vehicle door seals with single-layer adhesive materials face challenges during repairs, as they often leave behind tear-off residues and require extensive post-processing when replacing damaged sealing strips, and detachment can be difficult if the carrier profile is damaged.
Innovation Solution
A vehicle door seal assembly featuring a flexible strand with an elastomer material and an adhesive layer that can be easily detached, leaving a clean adhesive surface for spare part connection, utilizing a separating layer to facilitate detachment and a recess for excess adhesive, and employing a thermoplastic film that becomes adhesive upon heating to ensure precise fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer adhesive material is used to connect the sealing strip to the vehicle body, then the manufacturing process is simplified, but during repairs the adhesive leaves tear-off residues and requires extensive post-processing
Solution Approach 1:
The adhesive system is segmented into multiple functional layers: a first adhesive layer for bonding to the sealing strip, a separating layer for controlled detachment, and a second adhesive layer for bonding to the vehicle body. This segmentation allows the sealing strip to be removed cleanly during repairs while maintaining strong initial bonding, resolving the contradiction between easy manufacture and easy repair.
Solution Approach 2:
The separating layer acts as an intermediary between the first and second adhesive layers. It provides a controlled weak point that facilitates clean detachment during repairs while allowing strong bonding during installation. This intermediary layer enables the adhesive system to perform both manufacturing simplicity and repair ease functions.
2Reliability
If the adhesive bond between the sealing strip and body is very strong, then connection reliability is improved, but during repairs the adhesive material tears and leaves residues on the body surface
Solution Approach 1:
Different regions of the adhesive system have different bonding characteristics: the first adhesive layer is formulated to bond strongly to the sealing strip material, the separating layer provides controlled weak bonding for clean detachment, and the second adhesive layer bonds strongly to the vehicle body. This local quality differentiation ensures strong connection reliability while preventing tear-off residues during repairs.
Solution Approach 2:
The adhesive system utilizes parameter changes in adhesion strength across different layers. The separating layer has deliberately reduced adhesion parameters compared to the outer adhesive layers, creating a controlled failure point that prevents resin tearing and residues while maintaining overall connection reliability through the stronger outer layers.
3Productivity
If a carrier profile is used to hold the sealing section, then the sealing strip can be continuously fastened to the vehicle body, but in the event of repairs the detachment requires a great deal of repair work
Solution Approach 1:
The invention extracts the sealing function from the carrier profile system. The sealing strip with its multi-layer adhesive system can be directly bonded to the vehicle body without requiring a separate carrier profile. This extraction eliminates the complexity of detaching damaged carrier profiles during repairs while maintaining continuous fastening efficiency through the self-contained adhesive system.
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
Enables efficient and repair-friendly replacement of sealing strips with minimal post-processing, ensuring a clean adhesive surface and precise alignment of spare parts, reducing repair complexity and time.
Implementation Method 1
the adhesive material could be formed by a thermoplastic film that is only made adhesive by heating
Data Source
Figure 1(a)~2
Figure 3~4(b)
Figure 5(a)~6(b)
AI summary
The invention relates to a circumferential seal or/and covering on a door or/and opening flap of a vehicle body, comprising a flexible strand (2) having an elastomer material and an adhesive material layer (3) extending in the longitudinal direction of the strand and connecting the strand (2) to the vehicle body (1). According to the invention, the strand (2) can be torn off from the body (1), leaving behind a sufficiently smooth adhesive surface for adhering the body (1) to a replacement part strand.