Vacuum Bagging a Carbon Fiber/Composite Part - Complete Video

Summary

This video demonstrates the vacuum bagging process used to create a carbon fiber composite part, offering a step-by-step guide from mold preparation to final demolding. The process includes applying resin, laying carbon fiber layers, and using a vacuum bagging system to achieve uniform pressure for curing. Key techniques such as using release agents, sealing with tape, and managing resin flow are highlighted. Additionally, an alternative method using a beaver tail as a resin trap is shown. This detailed process ensures strong, precise composite parts, ideal for both beginners and experienced fabricators.

Takeaways

• 😀 Vacuum bagging is a common method for constructing composite parts, ideal for carbon fiber and fiberglass.
• 😀 MIA PS tape is used to ensure an airtight seal around the mold perimeter during the vacuum bagging process.
• 😀 A semi-permanent release agent is applied to the mold to facilitate part removal and ensure a smooth finish.
• 😀 The carbon fiber is cut precisely by following a strand, making it easier to handle and reducing errors.
• 😀 Peel ply is used to achieve a satin finish or active surface for secondary bonding on the part.
• 😀 Perforated film is used to regulate the resin flow and prevent pooling, ensuring uniform resin distribution.
• 😀 Bleeder material absorbs excess resin, while the release film prevents resin from contaminating the breather layers.
• 😀 Proper sealing techniques and the use of a resin trap protect the vacuum pump and ensure optimal resin flow during the process.
• 😀 After applying resin and carbon fiber layers, the part is vacuum bagged to achieve uniform pressure and eliminate air pockets.
• 😀 After curing, the mold is removed, and the part is carefully finished by sanding the edges and sealing with epoxy to prevent splintering.

Q & A

What is the primary method used for constructing a composite part in this video?

The primary method demonstrated for constructing a composite part is vacuum bagging.

Why is carbon fiber chosen for this process over other materials?

Carbon fiber is chosen for its superior strength-to-weight ratio, which makes it ideal for creating durable, lightweight parts.

What is the purpose of applying MIA PS tape around the perimeter of the mold?

The MIA PS tape is applied to create an airtight seal between the mold and the mold frame, ensuring the vacuum bagging process works efficiently.

What kind of release agent is used in the video, and why?

A semi-permanent release agent is used for easy mold separation without damaging the part or the mold.

How do you avoid potential vacuum leak problems at the corners of the mold?

Instead of overlapping tape at the corners, the tape is torn at the corner to create a round shape, which prevents air gaps and possible vacuum leaks.

Why is the peel ply layer included in the process?

The peel ply layer is used to create a rough, active surface for secondary bonding or to achieve a satin finish on the part.

What is the function of the perforated film in the vacuum bagging process?

The perforated film regulates the flow of excess resin from the part into the bleeder material, ensuring a uniform resin-to-reinforcement ratio.

Why is it important to cut the bleeder material into layers?

The bleeder material is cut into layers to absorb excess resin that is drawn from the part, preventing it from saturating and ensuring the correct resin ratio.

What is the significance of the vacuum bagging material being oversized?

The vacuum bagging material is cut oversized to ensure it can be sucked down into the cavity created by the mold's contour, ensuring even pressure is applied during the vacuum process.

What is the purpose of the beaver tail method in the vacuum bagging process?

The beaver tail method replaces the vacuum reservoir and serves as a resin trap, absorbing excess resin and preventing it from reaching the vacuum pump.