Thermoplastic Panel Curing via Heated Blanket and Vacuum
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Solution Overview
Problem
Current thermoplastic panel manufacturing processes are inefficient and time-consuming, particularly in achieving the desired cure temperatures and durations for producing high-quality thermoplastic components like aerospace components.
Innovation Solution
A method involving the use of an invar mold, caul plate, breather frame, and heated blanket within a vacuum environment, where a thermoplastic panel preform is heated at a controlled rate from 500°F to 800°F (260°C to 427°C) to accelerate the curing process, potentially reducing the overall manufacturing time by half.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional thermoplastic panel manufacturing processes are used, then the curing process achieves desired material properties, but the manufacturing time is excessive and inefficient
Solution Approach 1:
The patent applies parameter changes by heating the thermoplastic preform to elevated temperatures (500-800°F or 260-427°C) to accelerate the curing process. This temperature parameter change enables the material to reach cure state much faster than traditional ambient or low-temperature processes, directly reducing manufacturing time while maintaining material quality
Solution Approach 2:
The patent implements preliminary action by pre-heating the preform and maintaining it under vacuum and heat before final consolidation. The preform is prepared with proper layering and vacuum sealing in advance, allowing the heating process to proceed efficiently without interruptions, thereby reducing total manufacturing time
2Productivity
If heating rate is increased to reduce curing time, then manufacturing efficiency improves, but risk of material defects or uneven curing increases
Solution Approach 1:
The patent employs feedback control through monitored heating rates (10-20°F per minute or 5.6-11.2°C per minute) and controlled dwell times at target temperatures (5-60 minutes at 500-600°F, then 5-60 minutes at 600-800°F). This controlled feedback approach ensures uniform heating and complete curing while preventing material defects, balancing speed with quality
Solution Approach 2:
The patent applies periodic action through staged heating cycles with specific dwell times at different temperature levels. The process includes heating to 500-600°F with a 5-60 minute dwell, then heating to 600-800°F with another 5-60 minute dwell. This periodic temperature control ensures thorough curing at each stage while maintaining overall process efficiency
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 enables a faster and more efficient production of thermoplastic panels with improved curing efficiency, suitable for both flat and contoured designs, while maintaining the quality of the material properties.
Implementation Method 1
heating, via the hot bond unit and through a heated blanket within the consolidation assembly, the panel preform
Implementation Method 2
generating, via a hot bond unit, a vacuum environment within the consolidation assembly
Data Source
AI summary
A method of manufacturing a thermoplastic panel may comprise: laying up a panel preform within a consolidation assembly, the panel preform comprising a plurality of plies of material comprising thermoplastic resin and fiber; generating, via a hot bond unit, a vacuum environment within the consolidation assembly; and heating, via the hot bond unit and through a heated blanket within the consolidation assembly, the panel preform.