Fiber Composite Preheating for Rapid Impregnation
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Solution Overview
Problem
The production of fiber composite materials, particularly those using thermoplastic polymers, faces a 'speed-quality dilemma due to the high viscosity of polymers above their melting point, requiring extensive time for complete impregnation and consolidation, which conflicts with the need for high process speeds in industry.
Innovation Solution
A method where fibers are heated to a temperature above the polymer's melting point, allowing them to transfer thermal energy indirectly to the polymer, thereby melting it quickly and achieving rapid impregnation and consolidation without decomposing the polymer, enabling a continuous high-speed production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the polymer is heated well above its melting point to reduce viscosity for complete impregnation, then the impregnation quality is improved, but the polymer decomposes relatively quickly
Solution Approach 1:
The fibers are pre-heated to a temperature above the polymer's melting point before the polymer is applied. This preliminary heating of the fibers creates a temperature gradient that enables rapid heat transfer to the polymer, achieving complete impregnation without requiring the polymer to be heated to decomposition temperatures
Solution Approach 2:
The fibers act as an intermediary heat transfer medium. Instead of directly heating the polymer to high temperatures (which causes decomposition), the fibers are heated first and then transfer thermal energy to the polymer through contact, enabling controlled heating that achieves impregnation without decomposition
2Productivity
If the duration for molten thermoplastic polymer impregnation is reduced to meet high process speed requirements, then productivity is improved, but the consolidation of the fiber-plastic composite and quality of the fiber composite material would suffer
Solution Approach 1:
The fibers are pre-heated to a temperature above the polymer's melting point before impregnation. This preliminary action stores thermal energy in the fibers, which is then rapidly transferred to the polymer during the brief impregnation window, enabling both high process speeds and complete consolidation
Solution Approach 2:
The process uses a periodic sequence of heating fibers, applying polymer, and rapidly consolidating. The pre-heating phase prepares the system for rapid energy transfer during the short impregnation window, creating an efficient periodic cycle that maintains both speed and quality
3Manufacturing precision
If fiber composite materials are manufactured in two steps (producing semi-finished products first, then thermoforming), then complete impregnation and consolidation can be achieved, but continuous production is not allowed and energy consumption increases since the polymer must be heated above melting point twice
Solution Approach 1:
The impregnation and consolidation steps are merged into a single continuous process. The pre-heated fibers enable the polymer to be impregnated and consolidated in one operation without requiring a second heating cycle for thermoforming, reducing energy consumption while maintaining complete impregnation
Solution Approach 2:
The process enables continuous production by eliminating the intermediate step of producing semi-finished products. The pre-heated fibers allow polymer impregnation and consolidation to occur continuously in a single pass, maintaining both completeness and energy 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 allows for the rapid and complete impregnation and consolidation of fiber composite materials, overcoming the 'speed-quality dilemma, and producing high-quality fiber composite materials with reduced energy consumption and no polymer decomposition.
Implementation Method 1
subjecting the fibers to thermal energy, the energizing heating the fibers to a temperature greater than the temperature of the polymer and the temperature to which the fibers are heated is greater than the melting temperature of the polymer
Implementation Method 2
the fibers are heated by the application of energy to a temperature that is above the temperature of the polymer and in particular also above the melting temperature of the polymer. The fibers heated in this way give off their thermal energy or heat to the environment and thus also to the polymer surrounding them. However, since the temperature of the fiber is above the melting temperature of the polymer, the transfer of heat from the fibers to the polymer results in melting of the polymer surrounding the fiber.
Data Source
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AI summary
The invention relates to a method for producing a fibre composite material, a fibre composite material produced by the method and a device for carrying out the method.