RTM Mold Flow Aid for Fiber Label Integration
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Solution Overview
Problem
The existing method for identifying fiber-reinforced plastic components during the RTM process is prone to errors due to labels not being sufficiently incorporated by the resin, often resulting in labels adhering to the mold and not being embedded within the component, especially when using nonsaturable materials for better readability.
Innovation Solution
A method involving a semifinished fiber product with a label applied, featuring a carrier material with an adhesion promoter and a flow aid portion in the RTM mold with channel-shaped depressions that allow the resin to flow around the label, ensuring secure fixation and integration into the component during curing, using a reactive resin system with internal release agents to facilitate demolding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a label is applied to the semifinished fiber product for identification, then the component can be identified during production, but the label may not be sufficiently incorporated by the resin and remains adhering in the mold upon demolding
Solution Approach 1:
The patent introduces a flow aid portion with channel-shaped depression as an intermediary structure between the label and the mold. This depression allows the resin to flow underneath the label, creating a flow channel that prevents the label from adhering to the mold wall while still being incorporated into the component. The flow aid portion acts as a mediator that enables both reliable identification (label incorporation) and easy demolding (prevention of label-mold adhesion).
Solution Approach 2:
The patent adds a vertical dimension to the label-mold interface by creating a channel-shaped depression that projects beyond the label in the length direction. This dimensional change creates a flow channel space that allows resin to flow between the label and mold wall, transforming the flat contact interface into a three-dimensional structure that prevents adhesion while maintaining label incorporation.
2Illumination intensity
If the label is produced from a material which is not able to be saturated by the resin system for good readability, then the label remains adhering in the mold upon demolding, but the identification becomes unreliable
Solution Approach 1:
The flow aid portion serves as an intermediary that enables resin flow between nonsaturable label materials and the mold. The channel-shaped depression creates a pathway for resin to flow underneath the label, ensuring the label is incorporated into the component without requiring the label material to be resin-saturable, thus maintaining both readability and incorporation reliability.
Solution Approach 2:
The patent changes the physical parameter of the mold structure by introducing a channel-shaped depression with specific dimensions (projecting beyond the label in length). This structural parameter change allows the resin flow pattern to be modified, enabling resin to flow underneath the label and incorporate it properly, regardless of the label material's saturation properties.
3Productivity
If automated RTM process is used for production, then productivity increases, but errors in label incorporation are noticed only after demolding, requiring considerable extra effort for identification
Solution Approach 1:
The patent implements a preventive measure by incorporating a flow aid portion with channel-shaped depression into the mold design before production begins. This structural feature proactively prevents label adhesion to the mold wall by enabling resin flow underneath the label, thus cushioning against the potential error of label misincorporation that would otherwise be detected only after automated demolding, reducing rework time and maintaining high productivity.
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 reliably fixes the label to the component, ensuring accurate identification and easy demolding by forming resin webs that securely integrate the label, maintaining readability and stability while allowing for larger labels and varied positioning.
Implementation Method 1
The channel-shaped depression provides a flow channel through which the plastic material flows during infiltration of the semifinished fiber product
Implementation Method 2
Under pressure and at elevated temperature, the plastic compound cures in the mold to form the fiber-reinforced plastic component
Implementation Method 3
The label can have an adhesion promoter layer. The fixing of the label prevents the label from being able to slide on the semifinished fiber product or from being able to be released from the semifinished fiber product during transport thereof
Implementation Method 4
The plastic compound used is a reactive resin system which, in addition to the resin and a curing agent, can contain still further ingredients. The latter passes through the channel-shaped depression between label and mold and facilitates demolding
Data Source
AI summary
A method for identifying a fiber-reinforced plastic component includes the acts of providing a fiber preform, applying a label to the fiber preform and holding it in place, inserting the preform together with the label in a mold and closing the mold, and infiltrating the preform with a plastic compound and curing it in the closed mold. In order to reliably identify the plastic component, the label comes to rest on a flow aid portion formed on the inner mold wall which has at least one channel-shaped depression. The longitudinal extension of the flow aid portion projects beyond the label.