Natural Fiber Sandwich Panel With Wave Core for Lightweight Trim
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Solution Overview
Problem
The automotive industry faces a challenge in creating lightweight interior trim components that maintain structural integrity and performance, as traditional manufacturing processes are not optimized for modern materials and designs that prioritize fuel economy and aesthetics in the context of autonomous vehicles.
Innovation Solution
A composite sandwich panel is developed, featuring a natural fiber core with thermoplastic layers, where the core is formed into a wave pattern and consolidated using heat and pressure, allowing for a lightweight yet robust structure that can be molded into various shapes for automotive applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional manufacturing processes (injection molding, thermoforming, compression molding) are used, then high quality parts are produced, but the components are heavier and not optimized for fuel economy
Solution Approach 1:
The patent applies composite materials by combining natural fiber core with thermoplastic layers to create a sandwich panel structure. This composite construction achieves both lightweight properties and high manufacturing quality, resolving the contradiction between part quality and weight reduction for automotive interior trim components.
Solution Approach 2:
The patent segments the component into distinct layers: a natural fiber core and thermoplastic skin layers. This segmentation allows each layer to perform its specific function optimally - the core provides lightweight structural support while the thermoplastic layers provide surface quality and durability, achieving both weight reduction and high manufacturing precision.
2Strength
If traditional solid structures are used, then structural integrity is maintained, but fuel economy deteriorates due to increased weight
Solution Approach 1:
The patent employs curved wave patterns and contoured shapes in the natural fiber core structure. These curved geometries provide structural strength and rigidity comparable to solid structures while using significantly less material, thereby maintaining structural integrity while reducing weight to improve fuel economy.
Solution Approach 2:
The natural fiber core creates a porous or cellular structure that maintains structural integrity through its geometry and material distribution. This porous construction reduces material usage and overall weight while preserving the necessary strength for automotive interior applications, contributing to fuel economy improvement.
3Weight of moving object
If modern materials like natural fiber are used, then weight is reduced, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the core formation and skin layer attachment into a single integrated molding process. The natural fiber core is molded first, then thermoplastic layers are applied and bonded in the same manufacturing cycle, reducing process complexity despite using modern natural fiber materials. This integration simplifies manufacturing while achieving weight reduction goals.
Solution Approach 2:
The patent utilizes parameter changes by controlling temperature and pressure during the molding process to optimize the bonding between natural fiber core and thermoplastic layers. By adjusting these parameters, the complex manufacturing process becomes manageable and efficient, enabling weight reduction through modern materials without excessive process complexity.
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 solution enables the creation of lightweight, high-performance interior trim components that meet modern design criteria for aesthetics and structural integrity, while also being adaptable for various automotive and potentially aerospace applications.
Implementation Method 1
The first and second thermoplastic layers are then heated to a predetermined temperature characterised by the specific resin and filler requirements, while the consolidated core is also heated to a predetermined temperature
Implementation Method 2
the assembly is molded in a molding press into a desired shape determined by product design intent
Data Source
AI summary
Provided is a composite sandwich panel. The composite sandwich panel includes a core, a first thermoplastic layer applied to a first side of the core, and a second thermoplastic layer applied to a second side of the core. The core is provided in the form of a wave board formed from natural fiber. Also provided is a process for manufacturing a composite sandwich panel. The process comprises extruding a first and second thermoplastic layer into respective flat sheets, forming a consolidated natural fibrous mat, and molding the consolidated natural fibrous mat into a consolidated core having a predetermined geometry. The first and second thermoplastic layers, as well as the consolidated core are heated to a predetermined molding temperature. The heated consolidated core is placed between the heated first and second thermoplastic layers, and the assembly is molded in a molding press into a desired shape determined by product design intent.