Sandwich Component Molding With Particle Foam and Class A Surfaces
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Solution Overview
Problem
Existing methods for manufacturing planar components in sandwich lightweight construction struggle to achieve a balance of low weight, high stiffness, and cost-effectiveness, particularly when using thermoplastic deep-drawn films with polyurethane foams.
Innovation Solution
The method involves using expandable particle foams like EPS, EPE, or EPP instead of polyurethane foams, combining them with thermoformable films or deep-drawn substrates in a tool, and utilizing heat to fuse and bond the particles with the substrates without steam, allowing for a cost-effective production of high-quality, lightweight components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If polyurethane foams are used with thermoplastic deep-drawn films, then manufacturing process is established, but weight and cost-effectiveness are compromised
Solution Approach 1:
The patent changes the material parameter from polyurethane foam to expandable particle foam (EPS, EPE, or EPP), which has inherently lower density. This material substitution achieves weight reduction while the particles are expanded in-situ within the mold cavity, maintaining manufacturing feasibility without requiring complex external foam generation equipment
Solution Approach 2:
The patent replaces the mechanical foam generation system (polyurethane two-component mixing and expansion) with a thermal expansion system where pre-formed particles expand when heated by the tool. This substitution eliminates the need for complex foam chemistry systems while achieving the same lightweighting effect
2Weight of moving object
If expandable particle foams are used, then weight is reduced, but manufacturing precision and surface quality may be compromised
Solution Approach 1:
The substrates are pre-formed with the required high-precision geometry and surface quality (including Class A surfaces) before the foam expansion process. This preliminary formation of critical surfaces ensures manufacturing precision is achieved independently of the foam expansion, allowing the foam to serve only as a lightweight infill material
Solution Approach 2:
The patent applies different quality requirements to different parts of the component: substrates receive high-precision forming for visible and functional surfaces, while the foam infill areas accept lower precision as they are not visible and serve primarily structural purposes. This local differentiation allows overall high quality without compromising weight reduction
3Ease of manufacture
If steam-based processes are used for particle foam expansion, then expansion is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the steam generation step from the foam expansion process. Instead of generating steam externally and introducing it into the mold, the system uses direct thermal conduction from the heated tool surfaces to expand the particles in-situ. This extraction eliminates complex steam generation and delivery equipment
Solution Approach 2:
The tool itself serves dual purposes: it forms the substrates and simultaneously provides the heat for particle expansion through its heating system. The process uses the existing thermal energy of the tool rather than requiring a separate steam generation system, achieving self-service and simplifying the overall manufacturing 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
This approach enables the production of lightweight, high-stiffness components with a durable surface that meets Class A quality standards, suitable for outdoor applications, while minimizing manufacturing costs and eliminating the need for steam-based processes.
Implementation Method 1
Heat is applied to the tool and the particles are melted or softened as a result
Implementation Method 2
the particles are melted or softened as a result of heat application
Implementation Method 3
the tool is closed at least to a pre-closing position... the particles are compressed
Data Source
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AI summary
The invention relates, inter alia, to a method for manufacturing a component, comprising the following steps: a) providing a first film-like substrate with a first outer contour, b) providing a second film-like substrate with a second outer contour, which has at least one opening, c) providing a tool comprising two tool halves, which can be opened and closed, wherein the second tool half has at least one filling opening, wherein the first tool half has a first inner contour that is complementary in shape to the first outer contour and the second tool half has a second inner contour that is complementary in shape to the second outer contour, d) arranging the two substrates in the opened tool such that the opening and the filling opening are aligned, e) closing the tool, f) providing granular starting material in the form of loose particles of an expandable particle foam.g) Feeding the particles through the filling opening and through the breakthrough into a cavity bounded by the two substrates.