Multi-Layer Plastic Panel Adhesive Connection
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Solution Overview
Problem
Existing methods for connecting multi-layer plastic panels to other components, such as vehicle body parts, often disrupt the fiber flow and weaken the composite material, requiring costly and application-specific tools, and can lead to stress peaks and uneven power transmission.
Innovation Solution
A method involving a multi-layer plastic sheet with a cover layer of stretched plastic fibers, where an adhesion promoter is applied in the connecting area, and a hold-down device maintains fiber stretching during injection molding of a plastic element, ensuring strong and uniform connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional screw or rivet connections are used to connect plastic panels, then connection is achieved, but the fiber orientation is disrupted and the fiber-matrix composite is weakened
Solution Approach 1:
The patent introduces an adhesive layer as an intermediary substance between the plastic panel and the fastener. This adhesive mediator allows connection to be achieved without disrupting the fiber orientation, as the adhesive bonds to the panel surface and distributes loads without requiring mechanical insertion that would cut or displace fibers.
Solution Approach 2:
The patent replaces the mechanical connection system (screws or rivets that physically penetrate and disrupt fibers) with a chemical bonding system (adhesive that bonds to the surface). This substitution eliminates the need for mechanical insertion that would compromise fiber integrity while maintaining connection functionality.
2Manufacturing precision
If subtractive processes like drilling or milling are used to create recesses, then connection areas are prepared, but damage and destruction of fibers occur and thermal stress is generated
Solution Approach 1:
The patent extracts the need for subtractive processes entirely by applying adhesive directly to the existing panel surface. Instead of removing material to create recesses, the adhesive is applied in its original form and bonds to the surface, eliminating fiber damage and thermal stress from machining operations.
Solution Approach 2:
The patent applies the adhesive in advance before any connection elements are installed. This preliminary application of adhesive prepares the surface for connection without requiring subsequent machining operations that would damage fibers or generate thermal stress.
3Ease of manufacture
If cutouts are created in multilayer plastic sheets, then connection areas are formed, but stress peaks are promoted and uniform force transmission is compromised
Solution Approach 1:
The patent applies adhesive locally to specific connection areas on the panel surface rather than requiring cutouts. This localized adhesive application maintains the continuous fiber structure and uniform material composition throughout the panel, while still providing adequate bonding at the connection points.
4Strength
If expensive and application-specific tooling is used to form recesses during manufacturing, then fiber orientation is maintained, but manufacturing costs increase
Solution Approach 1:
The patent replaces expensive, application-specific reusable tooling with a simple, universal adhesive application process. The adhesive can be applied using standard, inexpensive equipment that works across different panel types and connection requirements, eliminating the need for costly specialized tooling while maintaining fiber orientation integrity.
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 allows for simple and cost-effective connection of plastic components with maintained fiber integrity and improved stress distribution, enabling efficient power transmission and reducing material costs.
Implementation Method 1
an adhesion promoter is applied to the top layer at least in a connection area of the top layer
Implementation Method 2
a hold-down including the connection area of the top layer is pressed onto the top layer in order to fix a predetermined stretch of the plastic fiber in the connection area
Implementation Method 3
an injection-molded plastic element is injected onto the top layer in the connection area
Data Source
Figure 1~2
AI summary
A method (1) for producing a plastics component from a multi-layer plastics plate. The plastics plate has a surface layer composed of stretched plastics fibers. In a molding step (2), a molded component is produced from the plastics plate. In a surface preparation step (3), an adhesion promoter is applied to the surface layer at least in a connecting region of the surface layer. In an injection-molding preparation step (4), a hold-down means which encompasses the connecting region of the surface layer is pressed against the surface layer in order to fix a predefined stretch of the plastics fibers in the connecting region. After the hold-down means has been pressed on, an injection-molding plastics element is, in an injection-molding step (5), injection-molded from an injection-molding plastic onto the surface layer in the connecting region.