Extruded Sealing Cover Strip Offset Reattachment to Lower Tearing Force
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Solution Overview
Problem
The existing methods for processing extruded material to form sealings and edge protection strips on vehicle bodies require high and variable tearing forces to separate the cover strip from the adhesive layer, which is obstructive and inefficient.
Innovation Solution
The method involves releasing and re-connecting the cover strip to the adhesive layer with an offset, reducing the maximum tearing force by limiting the adhesive bond to the internal side of the cover strip, which has a coating to facilitate easy tearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cover strip is continuously fed with segments connected at abutment ends, then the extruded material can be continuously processed to form sealings, but high and variable tearing forces are required to separate the cover strip from the adhesive layer
Solution Approach 1:
The cover strip is divided into segments connected at abutment ends. By releasing and re-connecting the cover strip at offset positions, each segment can be separated individually with reduced tearing force, while maintaining continuous feeding capability for productivity.
Solution Approach 2:
The cover strip is preliminarily released from the adhesive layer at a release location before the tearing process. This preliminary action reduces the adhesive bond strength at the separation point, thereby reducing the tearing force required during subsequent processing.
2Stability of the object's composition
If the cover strip overlaps the abutment ends with connection tabs, then the segments can be connected, but the adhesive material creates strong bonds that increase tearing force maxima
Solution Approach 1:
The connection tabs are extracted or removed from the cover strip segments. This eliminates the overlapping connection structure that creates adhesive bonding maxima, allowing segments to be connected without creating high tearing force peaks at connection locations.
Solution Approach 2:
The connection method is changed from longitudinal overlapping (in the same dimension as the adhesive flow) to a different dimensional approach where the cover strip is re-connected at an offset position along the longitudinal direction, avoiding the adhesive material ingress problem.
3Strength
If adhesive material wets connection elements and makes its way between cover strip and adhesive layer, then segments are bonded, but tearing force maxima occur at connection locations
Solution Approach 1:
An offset position is introduced as an intermediary between the original connection location and the re-connection location. This offset position allows the cover strip to be re-connected away from where adhesive material would create bonding maxima, reducing the tearing force required.
Solution Approach 2:
The adhesive bonding is made non-uniform by creating different conditions at different locations: at the offset re-connection location, the adhesive bond is limited to the internal side of the cover strip with a coating that reduces adhesion, ensuring easy tearing while maintaining sufficient bond strength for processing.
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 approach significantly reduces the required tearing forces and their variability, ensuring a more efficient processing of extruded material for forming sealings and edge protection strips on vehicle bodies.
Implementation Method 1
adhesive material can reach only up to the uninterrupted internal side of the cover strip that faces the adhesive face, said internal side of the cover strip having a coating which limits the adhesive bond
Data Source
AI summary
A method for preparing extruded material for processing to form sealings and/or edge protection strips on vehicle bodies, where the extruded material to be prepared, which is substantially of an elastomer substance, includes a covering strip protecting an adhesive layer and extending in the longitudinal direction of the extruded material. The covering strip has sub-sections that are connected to each other on the abutment ends thereof. The covering strips are detached from the adhesive layer and are reconnected to the adhesive layer, optionally in such a way that they are offset to the longitudinal direction of the extruded material. If the offsetting is carried out, the abutment ends of the sub-sections of the covering strip are arranged such that they are offset in relation to the original position thereof on the adhesive layer.