Thermoplastic Composite Tooling Surface for High-Speed First-Ply Hold
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Solution Overview
Problem
The adhesion of the first ply to a tooling surface during thermoplastic prepreg layup is challenging, especially at high speeds, and the use of high-temperature resistant polyimide films is cumbersome and costly, leading to inefficiencies in productivity and part quality.
Innovation Solution
A method involving surface preparation of the tooling deposition surface to achieve a roughness of at least 6.3 micrometers, followed by applying a thermoplastic polymer film that adheres strongly to the surface, allowing the first ply to be held during layup and easily unmolded, enabling tooling reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-temperature resistant polyimide film is used to cover the tooling surface, then the first ply can adhere to the tooling and the preform can be unmolded, but the manual operation is time-consuming and reduces productivity
Solution Approach 1:
The tooling surface is prepared in advance by applying a release agent or coating that facilitates both initial ply adhesion and subsequent unmolding. This preliminary preparation eliminates the need for time-consuming manual film application during each layup operation, thereby maintaining reliable adhesion while improving productivity.
Solution Approach 2:
The tooling surface is designed to possess inherent properties that enable both ply adhesion and easy unmolding without requiring external protective films. The surface morphology or material composition is engineered to provide controlled adhesion characteristics, allowing the system to serve itself without additional manual intervention.
2Reliability
If the tooling surface is covered with thermalimide film pieces bonded by adhesive tapes, then adhesion and unmolding are enabled, but the complex manual operation affects part quality and increases cost
Solution Approach 1:
The problematic adhesive tapes and film pieces are completely removed from the process. Instead, the tooling surface is treated with a release agent or coating that provides the necessary adhesion and unmolding functionality without introducing foreign materials that could cause surface defects or require manual positioning.
Solution Approach 2:
A uniform release agent or coating is applied across the entire tooling surface, creating consistent adhesion properties throughout. This homogeneous treatment eliminates the non-uniform surface conditions created by piecemeal film application, ensuring uniform preform quality without manual positioning errors.
3Ease of manufacture
If the deposition surface is smooth, then the tooling is easy to manufacture, but the first ply cannot adhere properly during high-speed layup
Solution Approach 1:
The tooling surface is modified locally in the deposition area to provide enhanced adhesion characteristics, such as increased roughness or localized chemical treatment, while maintaining smooth surfaces in non-deposition areas. This localized modification ensures reliable ply adhesion during high-speed layup without compromising overall tooling manufacturability.
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
Enables stable layup operations at high speeds with improved productivity and part quality by ensuring the polymer film remains bonded to the tooling, facilitating immediate reuse and reducing manual handling costs.
Implementation Method 1
a polymer film made of a second polymer, consolidated on the at least part of the deposition surface so that the polymer film adheres at all points to the at least part of the deposition surface
Implementation Method 2
covering at least part of the deposition surface, by a polymer film made of a second polymer, consolidated on the at least part of the deposition surface
Data Source
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AI summary
The invention relates to a fiber layup method comprising preparing a deposition surface (110) of a tooling (100) configured for the fiber layup of a prepreg comprising a thermoplastic polymer matrix, the method comprising steps of: preparing the deposition surface (110); depositing a thin layer (320) of a thermoplastic polymer on at least part of the deposition surface (110) thus prepared; wherein a melting temperature of the thermoplastic polymer of the thin layer is equal to or higher than a melting temperature of the thermoplastic polymer matrix. The invention also relates to a tooling configured to implement such a method.