Continuous Composite Sandwich Fabrication with Thermal Texturing
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Solution Overview
Problem
Conventional methods for manufacturing composite sandwich structures are non-continuous, leading to material waste and challenges in achieving precise tolerances, especially when fabricating complex shapes or curved structures, and require additional processes like painting which add cost and weight.
Innovation Solution
A continuous manufacturing process involving preheating, consolidation, and incremental texturing or coating of composite sandwich structures, using a sequence of zones including preheating, consolidation, and texturing/coating to form composite sandwich structures with consistent results and complex shapes without material damage or springback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional non-continuous manufacturing methods are used, then individual sandwich panels can be fabricated, but material waste increases and manufacturing precision deteriorates
Solution Approach 1:
The patent implements a continuous manufacturing process where sandwich panels are produced through uninterrupted movement through heating, forming, and cooling zones. The laminate is continuously fed through the apparatus and processed in a single continuous operation, eliminating the start-stop nature of conventional batch processing and preventing material waste associated with repeated heating and processing cycles.
Solution Approach 2:
The patent employs controlled temperature parameter changes throughout the processing zones. The laminate is heated to specific temperatures in the heating zone, maintained at controlled temperatures during forming, and gradually cooled in the cooling zone. These controlled thermal parameter changes enable continuous processing while maintaining material integrity and reducing waste.
2Manufacturing precision
If conventional non-continuous methods are used, then individual panels can be made, but manufacturing precision and tolerance control worsen
Solution Approach 1:
The continuous processing approach maintains consistent temperature, pressure, and forming conditions throughout the manufacturing process, eliminating variations introduced by repeated batch processing. This continuous action ensures uniform dimensional control and improved precision across all produced panels while maintaining high production efficiency.
Solution Approach 2:
The apparatus incorporates temperature control systems and process monitoring that provide feedback to maintain optimal processing conditions. The heating and cooling zones are controlled to maintain specific temperature profiles, and the forming process is monitored to ensure consistent dimensional outcomes, thereby improving manufacturing precision.
3Adaptability or versatility
If cut and fold process is used for contoured shapes, then complex shapes can be fabricated, but material waste increases and manufacturing precision deteriorates
Solution Approach 1:
The patent uses controlled temperature parameter changes to enable the laminate to be formed into complex contoured shapes directly during the continuous processing. By heating the laminate to appropriate temperatures in the heating zone and maintaining controlled forming conditions, the material can be shaped into complex geometries without requiring subsequent cutting and folding operations, thereby reducing material waste.
Solution Approach 2:
The laminate is pre-formed into the desired complex shape during the continuous heating and forming process before final cooling and solidification. This preliminary shaping action eliminates the need for subsequent cut and fold operations, reducing material waste while maintaining the ability to fabricate complex shapes.
4Ease of manufacture
If painting process is applied for surface decoration, then aesthetic appearance is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent employs controlled temperature parameter changes to enable direct thermal coloring or surface treatment of the laminate during the continuous processing. By heating the laminate to specific temperatures and maintaining controlled atmospheric conditions, the surface can be decorated or colored directly without requiring separate painting operations, surface preparation, priming, and finishing steps, thereby simplifying the manufacturing process.
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
Enables the production of composite sandwich structures in continuous lengths with consistent results, reduced material waste, and the ability to form complex shapes, while maintaining structural integrity and dimensional stability, thus improving efficiency and reducing costs.
Implementation Method 1
preheating a laminate to a preforming temperature above a glass transition temperature of the laminate
Implementation Method 2
preheating temperature above a glass transition temperature of the laminate
Implementation Method 3
consolidating the laminate as the laminate is substantially continuously moved through a consolidation zone
Data Source
AI summary
A method for continuously fabricating a composite sandwich structure includes the steps of: (1) preheating a laminate to a preforming temperature above a glass transition temperature of the laminate but below or equal to a crystalline melt temperature of the laminate as the laminate is substantially continuously moved through a preheating zone, wherein the laminate comprises a first face sheet, a second face sheet and a core sandwiched between the first face sheet and the second face sheet; (2) consolidating the laminate as the laminate is substantially continuously moved through a consolidation zone in line with the preheating zone to form a continuous length of the composite sandwich structure; (3) moving the composite sandwich structure, substantially continuously, through at least one of a texturing zone and a coating zone; and (4) incrementally applying at least one of a surface texture and a surface coating to at least one surface of the composite sandwich structure.