What LRTM Process?

LRTM stands for “Light Resin Transfer Moulding,” which is a composite manufacturing process used to create parts with high strength-to-weight ratios. It is commonly used in the production of various components, including those used in aerospace, automotive, marine, and other industries. In LRTM, a two-part mould is used, typically made from materials like fiberglass or carbon fiber. The process involves injecting liquid resin into the mould to saturate the fibrous reinforcement materials (such as fiberglass or carbon fibers) and then allowing the part to cure. The term “light” in LRTM refers to the reduction in the overall weight of the finished part, which is achieved by carefully controlling the resin-to-fiber ratio and minimizing excess resin. *Steps in LRTM:* 1. *Mould Preparation:* The mould is prepared and coated with a mould release agent to ensure that the cured part can be easily removed from the mould. 2. *Laying Down Fibres:* Layers of reinforcing fibres (such as fiberglass or carbon fiber) are placed in the mould in the desired orientation and arrangement. 3. *Resin Injection:* A vacuum system is used to create negative pressure within the mould. Liquid resin is then injected into the mould using a controlled process. The vacuum helps to distribute the resin throughout the fibres evenly. 4. *Resin Saturation:* The vacuum pressure facilitates the resin’s flow through the fibres, saturating them completely. This results in a strong bond between the fibres and the resin. 5. *Curing:* The mould, with the infused resin and fibres, is placed in an oven or allowed to cure at room temperature. The heat or time-dependent curing process ensures that the resin solidifies and hardens, forming a durable composite part. 6. *Part Removal:* Once the curing process is complete, the part is carefully removed from the mould. The mould release agent helps in easy demoulding. LRTM offers several advantages, including precise control over resin infusion, reduced material waste, and the ability to create complex shapes with relatively low tooling costs compared to other manufacturing methods. However, it does require specific equipment and expertise to ensure successful results. Please note that the term “LRTM” and its details are accurate up to my last knowledge update in September 2021, and there might have been developments or changes in the field since then.