Thermoformable Honeycomb Panel Adhesion
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Solution Overview
Problem
Current thermoformable panels with honeycomb cores coated with thermoplastic materials face challenges in manufacturing efficiency, cost, weight, and mechanical properties, particularly when subjected to bending stresses, leading to detachment of the coating layers from the core plate.
Innovation Solution
A thermoformable panel design featuring a honeycomb core plate with a coating layer of thermoplastic material, where the coating layer is chemically and physically adhered to the core plate using enlarged contact surfaces at the head edges of the cells, and the use of thermoplastic materials with different softening temperatures to enhance adhesion and mechanical strength, while minimizing weight and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lamination or connection of sheets/films to core layer is used, then manufacturing cost is reduced, but coating layers detach from core plate under bending stresses
Solution Approach 1:
The patent applies preliminary action by pre-forming enlargements (protrusions) on the head edges of the honeycomb cells before coating application. These enlargements create mechanical interlocking features that prevent coating detachment during subsequent bending operations, thus solving the adhesion problem while maintaining cost-effective manufacturing methods.
Solution Approach 2:
The patent applies local quality by modifying only the head edges of the honeycomb cells with enlargements, rather than changing the entire core structure. This localized modification provides enhanced adhesion precisely where the coating layer needs support during bending, while keeping the rest of the lightweight honeycomb structure intact.
2Strength
If Baypreg technology with polyurethane spraying is used, then mechanical strength and low specific weight are achieved, but manufacturing cost increases and dirtying problems occur
Solution Approach 1:
The patent replaces the expensive polyurethane coating with thermoplastic films or sheets that can be applied through more economical lamination or heat sealing processes. While the material properties differ, the thermoplastic coating achieves sufficient mechanical strength for the application while dramatically reducing manufacturing cost and eliminating the dirtying problems associated with spray application.
Solution Approach 2:
The patent changes the material parameter from polyurethane to thermoplastic materials, and changes the application method parameter from spraying to lamination/heat sealing. This parameter substitution maintains the essential function of providing mechanical strength while improving ease of manufacture and reducing costs.
3Strength
If coating layer is applied to honeycomb core, then mechanical strength is improved, but weight increases
Solution Approach 1:
The patent uses thin film or sheet coatings applied to the honeycomb core structure. These thin films provide the necessary mechanical strength and surface protection while adding minimal weight, thus resolving the contradiction between strength improvement and weight increase.
4Reliability
If head edges of cells have enlarged contact surfaces, then adhesion between coating and core is improved, but manufacturing complexity increases
Solution Approach 1:
The enlargements on the head edges are pre-formed during honeycomb core manufacturing, before the coating application step. This preliminary action ensures that the adhesion-enhancing features are already in place, simplifying the subsequent coating process rather than adding complexity.
Solution Approach 2:
The enlargements are localized only to the head edges of the cells, not the entire core structure. This localized modification provides the necessary adhesion improvement while keeping the overall device complexity low, as only specific regions are modified.
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
The solution provides a panel with improved stiffness, reduced weight, and cost-effectiveness, maintaining mechanical strength and acoustic insulation properties, suitable for various applications including the automotive industry, without compromising on structural integrity or increasing density.
Implementation Method 1
a coating layer comprising at least one thermoplastic material is coupled to said core plate by a chemical/physical adhesion
Implementation Method 2
a coating layer comprising at least one thermoplastic material is coupled to said core plate by a chemical/physical adhesion
Implementation Method 3
the use of thermoplastic materials with different softening temperatures to enhance adhesion and mechanical strength
Data Source
AI summary
The present invention relates to a thermoformable panel for shelves composed of: at least one core plate having a honeycomb structure composed of a plurality of adjacent cells; a coating layer that includes at least one thermoplastic material coupled to the core plate on at least one face of the core plate. The invention envisions using coating films for the honeycomb core plate that improve adhesion between the material of the honeycomb core plate and the coating films, as well as optional finishing layers overlapped thereon, reducing costs in relation to present honeycomb panels by simplifying manufacturing processes, all while maintaining elevated properties of mechanical strength and low density, and therefore a low weight.