What material layer is used within the vacuum bag pressure system to absorb excess resin during curing?

The correct answer is the bleeder. In the context of the vacuum bag pressure system, the bleeder layer serves a crucial role during the curing process of composite materials. Its main function is to absorb excess resin that may be present during the resin infusion process.

During curing, it is essential to ensure that the right amount of resin is used to achieve optimal strength and functionality in the composite. The bleeder layer helps to control the resin saturation level, allowing for excess resin to be absorbed rather than pooling or creating unwanted air pockets. This layer aids in maintaining the desired ratio of resin to fiber, which is critical for the performance and durability of the composite material.

In contrast, the breather layer allows for air to escape and facilitates the even application of pressure across the composite. The release layer, on the other hand, prevents the composite from sticking to the bag or mold, ensuring easy removal after curing. The vacuum punch does not relate directly to resin management during curing. Hence, the bleeder's specific function of managing resin absorption is what makes it the correct choice for this question.