Perforated Caul Sheet Resin Flow Control
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Solution Overview
Problem
Resin infusion processes face challenges such as resin flow restriction, uneven resin distribution, surface finish issues, and complex tooling requirements, particularly in applications requiring aerodynamic surfaces and integrated components.
Innovation Solution
A perforated caul sheet with tailored perforation patterns and densities is used to control resin flow, eliminating the need for a peel ply and allowing direct placement of resin supply hardware, thereby optimizing resin distribution and simplifying tooling for complex components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peel ply is used to protect the fiber component, then the fiber component is protected from direct resin contact, but the resin flow is restricted and infusion time increases
Solution Approach 1:
The invention removes the peel ply layer from the resin infusion process. By eliminating this intermediate layer, resin can flow directly into the fiber component without restriction, significantly reducing infusion time while maintaining component protection through the vacuum bag system alone.
2Manufacturing precision
If resin supply components are located off the fiber component, then the component surface is not marked, but resin supply is limited and infusion distances increase
Solution Approach 1:
The vacuum bag serves multiple functions simultaneously: it protects the fiber component, creates the vacuum for resin infusion, and acts as the resin distribution media. This eliminates the need for separate resin supply components, allowing direct resin application onto the component surface without mark-off while maintaining efficient resin supply.
3Reliability
If a flexible peel ply and flexible resin distribution media are placed in contact with the fiber component, then the component is protected and resin is distributed, but the surface finish becomes rough
Solution Approach 1:
The invention removes both the flexible peel ply and flexible resin distribution media from direct contact with the fiber component. Protection is maintained through the vacuum bag system, and resin distribution is achieved through the rigid vacuum bag conforming to the component shape, resulting in a smooth surface finish suitable for aerodynamic applications.
4Manufacturing precision
If uniform resin distribution media is used, then resin is distributed evenly across the component, but resin starvation occurs in isolated areas
Solution Approach 1:
The invention uses a rigid vacuum bag that dynamically conforms to the component's three-dimensional shape, creating non-uniform resin distribution patterns that actively direct resin to isolated and hard-to-reach areas. This dynamic adaptation prevents resin starvation by ensuring all areas receive adequate resin flow, unlike static uniform distribution media.
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 reduces infusion time, ensures a smooth surface finish, and enables the resin infusion of complex parts with simplified tooling, improving infusion reliability and reducing scrap and labor costs.
Implementation Method 1
a vacuum is drawn which both compacts the fiber component and draws resin through the component
Implementation Method 2
resin is drawn through the plurality of caul plate apertures using the general vacuum
Implementation Method 3
The perforations may have a tapered cross section... controlling the flow of resin through a fiber component
Data Source
Figure 1
Figure 2~4
Figure 5~7
AI summary
Resin infused composite parts (24) are fabricated using a caul sheet (26) having perforations (48) therein for optimizing the flow of resin (34) through the parts and allowing a simplified tooling and consumable arrangement for complex parts while achieving a smooth, aerodynamic caul-side or bag-side finish.