Ever asked yourself how the RTM process works? Discover how to use Resin Transfer Molding (RTM) for producing high-performance, lightweight composite parts with exceptional surface quality. In this video, we take you through the entire RTM process, a cutting-edge method widely used in industries such as automotive, aerospace, and caravan production.

1. Preparation: The mold, which consists of two halves, is prepared by cleaning and separating the cavity. Dry reinforcement materials, such as glass, carbon or even sandwich complexes, are cut to the desired shape and size and then stacked. As an optional step, the cut materials are formed into preforms. #Preforming involves shaping the materials into a configuration that closely matches the final part. This step ensures that the fibers are oriented correctly and enhances the structural integrity of the final product.

2. Reinforcement placement: The unimpregnated reinforced fibers are then placed into the mold. The mold is subsequently closed and securely clamped to ensure that it remains sealed during the resin injection process.

3. Resin injection: With the mold closed, liquid resin is injected under pressure. The resin flows through the reinforcement materials, thoroughly wetting them out and filling all the cavities. This step is critical for ensuring that the final part has the desired mechanical properties and surface quality.

4. Curing: The resin cures within the mold, giving the part its final shape and strength. The cycle time for curing can vary depending on the resin system and the part's complexity. Additional injection pressures are used for this purpose.

5. Demolding: After the resin has fully cured, the mold is opened, and the finished part is removed. The part is then ready for any post-processing steps, such as trimming, machining, or painting.

Resin Transfer Molding allows for efficient production of complex composite components, ensuring excellent laminate quality, low cavity content, and smooth surfaces on both sides. With short cycle times and high levels of automation, RTM is ideal for medium to large series manufacturing. It’s a closed-molding process that offers flexibility in fiber orientation and material combinations, making it perfect for custom applications.