Fiber Tow Splitting Coating for Carbon Fiber Resin Wet-Out
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Solution Overview
Problem
The challenge in implementing carbon fiber in high-volume vehicle production lies in developing low-cost processing technologies due to difficulties in separating carbon fiber tows, as existing sheet molding compound processes are not suitable for carbon fibers, which tend to agglomerate and hinder resin wet-out and mechanical performance.
Innovation Solution
A method involving coating carbon fiber filaments with a polymer that contracts in the direction parallel to the filaments and expands perpendicular to them when exposed to a heat or UV source, creating gaps for easier separation and improved resin impregnation, replacing traditional sizing materials and enabling effective splitting of carbon fiber tows into segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional sheet molding compound process is used for carbon fiber, then glass fiber reinforced parts can be manufactured, but carbon fiber tows cannot be properly separated and processed
Solution Approach 1:
A polymer coating is applied as an intermediary substance on the carbon fiber tows. This polymer acts as a mediator that facilitates separation by creating gaps between filaments when it contracts, allowing the SMC process to be adapted for carbon fiber without direct mechanical separation
Solution Approach 2:
The polymer coating's physical parameters are changed through thermal or UV exposure, causing it to contract and create gaps between carbon fiber filaments. This parameter change enables the carbon fiber tows to be processed similarly to glass fiber tows in the SMC process
2Strength
If carbon fiber tows are used, then lightweight material with good mechanical properties is achieved, but the tows tend to agglomerate and hinder resin wet-out
Solution Approach 1:
The polymer coating segments the carbon fiber filaments by contracting and creating gaps between them. This segmentation prevents agglomeration and allows resin to penetrate and wet-out the individual filaments effectively, while maintaining the mechanical properties of the carbon fiber reinforcement
3Strength
If carbon fiber diameter is reduced for better performance, then mechanical properties improve, but separation of tows becomes more difficult
Solution Approach 1:
The polymer coating serves as an intermediary that facilitates separation of fine carbon fiber filaments. By contracting upon thermal or UV exposure, it creates gaps between the small-diameter filaments, enabling separation without requiring complex mechanical processes
4Ease of manufacture
If polymer coating is applied to carbon fiber filaments, then gaps are formed for easier separation, but additional processing step is required
Solution Approach 1:
The polymer coating application is merged with the existing SMC manufacturing process. The coating is applied to the carbon fiber tows before they are placed in the SMC mold, combining the coating step with the existing production workflow and minimizing additional 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 approach allows for efficient separation of carbon fiber tows without mechanical damage, enhancing the wet-out process and mechanical performance of carbon fiber reinforced SMC parts, addressing the limitations of existing methods by improving load transfer and resin flow.
Implementation Method 1
The polymer may be configured to contract in a direction parallel to the adjacent filaments and expand in a direction perpendicular to the adjacent filaments when exposed to a heat source
Implementation Method 2
The polymer may be configured to contract in a direction parallel to the adjacent filaments and expand in a direction perpendicular to the adjacent filaments when exposed to a UV light source
Data Source
AI summary
A fiber tow and methods for separating a fiber tow are disclosed. The fiber tow may include adjacent filaments and a polymer coating covering at least a portion of the adjacent filaments. The polymer coating may include a polymer that is configured to contract in a direction generally parallel to the adjacent filaments and expand in a direction generally perpendicular to the adjacent filaments. The polymer coating may contract/expand in response to an energy source, such as heat or a UV light source. The methods may include coating at least a portion of a plurality of filaments with a polymer, bundling the filaments into a fiber tow, and exposing the fiber tow to an energy source to contract the polymer in a direction generally parallel to the filaments and to expand the polymer in a direction generally perpendicular to the filaments. The filaments may be carbon fiber filaments.