Free-Running Cooling Rollers for Uniform Polymer-Impregnated Fiber Strip
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Solution Overview
Problem
Existing methods for producing unidirectionally aligned continuous fiber-reinforced polymer-impregnated fiber strips result in uneven thickness and cross-sectional deviations, leading to material loss, air pockets, and processing challenges, particularly when using polycarbonate as the thermoplastic matrix, which limits their application in high-value composites like electronic device housings and automotive trim.
Innovation Solution
The use of free-wheeling chill rolls with adjustable gaps and gasket rings to minimize thickness variations and air pockets, ensuring the fiber strip maintains a consistent thickness and rectangular cross-section, thereby reducing material waste and enhancing processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional driven chill rolls are used for producing fiber strips, then the fiber strip can be produced continuously, but the thickness becomes uneven and cross-sectional deviations occur
Solution Approach 1:
The patent applies the dynamics principle by making the chill rolls free-wheeling rather than driven, allowing them to rotate freely without external drive mechanisms. This dynamic configuration enables the rolls to adapt to thickness variations in the fiber strip during continuous production, eliminating the thickness unevenness and cross-sectional deviations that occur with rigid driven rolls while maintaining continuous production capability.
Solution Approach 2:
The patent changes the operational parameter of the chill rolls from fixed-driven rotation to free-wheeling rotation. This parameter change allows the rolls to automatically adjust their rotational speed and pressure distribution based on the actual fiber strip thickness, thereby achieving uniform thickness and correct cross-sectional shape during continuous production without sacrificing productivity.
2Device complexity
If driven chill rolls with fixed gap are used, then the production process is simple, but air pockets form and material loss occurs
Solution Approach 1:
By converting from fixed-gap driven rolls to free-wheeling rolls with variable gap, the system dynamically adapts to fiber strip thickness variations. This prevents air pocket formation and reduces material loss while maintaining relatively simple production process structure, as the free-wheeling mechanism itself provides the adaptive function without complex control systems.
Solution Approach 2:
The free-wheeling chill rolls perform self-adjustment of gap and pressure based on the fiber strip characteristics during production. This self-service capability eliminates air pockets and reduces material loss without requiring external complex control mechanisms, thereby maintaining production process simplicity while improving material efficiency.
3Speed
If driven chill rolls are used, then production speed can be controlled, but the fiber strip surface quality deteriorates
Solution Approach 1:
The free-wheeling chill rolls dynamically adjust their rotational speed and surface contact pressure based on the fiber strip passage, maintaining high production speeds while ensuring excellent surface quality. The dynamic adaptation of the free-wheeling mechanism prevents surface defects that occur with fixed-speed driven rolls.
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
The solution achieves a fiber strip with minimal thickness deviation (<5% from desired) and reduced air pockets, enabling the production of high-quality, aesthetically pleasing, and mechanically robust multilayer composites suitable for electronic devices and automotive applications.
Implementation Method 1
chill rolls for continuous production of a polymer-impregnated fiber strip
Data Source
AI summary
A device having at least one pair of free-running cooling rollers for the continuous production of a fibre strip impregnated with polymer, wherein the fibres are continuous fibres and the fibres in the impregnated fibre strip are aligned unidirectionally in the direction of travel of the impregnated fibre strip. Preferably, at least one of the two rollers is equipped with a pair of sealing rings preferably of the same type. Also disclosed is a polymer-impregnated fiber strip, a process for producing a polymer-impregnated fiber strip, and a multilayer composite.