Vacuum Bag Resin Distribution for Polymer Composites
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Solution Overview
Problem
Current methods for reinforcing parts lack efficient and uniform distribution of resin to the substrate, leading to incomplete reinforcement and potential stress on the part due to uneven pressure distribution during the vacuum bag process.
Innovation Solution
A novel method involving a holding fixture, sealing substrate, resin wicks, and a double-lip seal member to create a vacuum-sealed environment, allowing resin to migrate uniformly across the substrate lay-up under controlled pressure, with the use of a flexible sheet and injection ports for resin introduction, ensuring even distribution and minimizing styrene emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional vacuum bag process is used for resin impregnation, then the process is simple, but resin distribution is uneven and incomplete
Solution Approach 1:
The vacuum bag is divided into multiple sealed compartments or zones, each capable of independent vacuum control. This segmentation allows different regions to be evacuated at different rates or to different vacuum levels, enabling uniform resin distribution across the entire substrate surface while maintaining manageable system complexity through modular design
Solution Approach 2:
A vacuum distributor plate or manifold system is introduced as an intermediary component between the vacuum source and the substrate. This intermediary device distributes vacuum pressure uniformly across the resin impregnation area, ensuring even resin flow and distribution without requiring direct complex connections throughout the entire bag structure
2Manufacturing precision
If high vacuum pressure is applied to force resin into substrate, then resin penetration improves, but stress on the part increases
Solution Approach 1:
The substrate and resin are prepared and positioned in the vacuum bag before vacuum application begins. The resin is pre-placed in contact with the substrate surface, and the vacuum is then applied gradually in controlled stages. This preliminary preparation allows the resin to be drawn into the substrate uniformly without sudden high vacuum pressure that could stress or deform the part structure
Solution Approach 2:
The vacuum application is implemented in periodic cycles rather than continuous high vacuum. The process alternates between vacuum application phases (drawing resin into substrate) and holding phases (allowing resin to set and bond). This periodic action ensures complete resin penetration while preventing excessive stress accumulation on the part structure
3Productivity
If resin is introduced quickly to maintain productivity, then production speed increases, but resin distribution becomes uneven
Solution Approach 1:
Multiple resin introduction points or channels are distributed across the vacuum bag, allowing resin to be introduced simultaneously at multiple locations. The vacuum system continuously draws resin through the substrate across the entire surface area, maintaining continuous useful action throughout the impregnation process. This achieves both high productivity through parallel resin uptake and uniform distribution through simultaneous multi-point introduction
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 ensures complete and uniform resin distribution across the substrate, reducing stress on the part and minimizing styrene emissions, resulting in a more effectively reinforced product with improved structural integrity.
Implementation Method 1
the pocket has been evacuated of air and/or vapor
Implementation Method 2
resin wicks, and a double-lip seal member to create a vacuum-sealed environment, allowing resin to migrate uniformly
Data Source
AI summary
A method for structurally reinforcing a part is disclosed. The method comprising forming a part into a desired shape; placing the part on a holding fixture; introducing a substrate lay-up of a reinforcing material onto at least a portion of the part; placing a flexible sheet impermeable to a resin of the reinforcing material over a portion of the part having the substrate lay-up of said reinforcing material placed on the part, wherein the flexible sheet includes at least one injection port; evacuating all air and vapor from a pocket between the flexible sheet and the part; introducing the resin of the reinforcing material into the pocket through the at least one injection port; allowing the substrate and the resin of the reinforcing material to cure at least partially; and, removing the flexible sheet from the part.