RTM Light is an evolution of the traditional RTM process. It involves manufacturing fiberglass parts using fiberglass mat and injecting plastic resin with the aid of vacuum. The mold is closed under low pressure.

 

Gel coat is applied to the mold surface, overlapping with the cored RTM cover layer, which is where the injected resin travels toward the suction point. During this process, the thickness remains constant because it is determined by the gap between the mold and the counter-mold.

 

Recommended for medium-sized items, RTM Light practically does not emit styrene pollutants into the environment, making it more sustainable. It is widely used in the manufacturing of structural products and automotive applications.

 

Process

RTM Light was created to simplify the RTM process with lighter molds and more economical production methods. The RTM Light process changes the injection concept to low pressure combined with vacuum. Resin is transferred through channels on the side of the mold and, with the aid of vacuum, is “directed” to specific points within the mold. This process is used in various fields and for different applications.

 

RTM Light also allows the use of flexible counter-molds, such as silicone membranes. The materials used are the same as those used in conventional RTM.

 

The process is similar to the RTM Light process, but the goal is to produce an “Class A” finish.

Gel coat is eliminated, subsequent painting is not required, and the injection cycle time of the RTM process is reduced. It involves combining thermoplastic processes and materials (extrusion and thermoforming) with the RTM process.

 

First, a film of the desired color is manufactured using a sheet extruder and then thermoformed. This thermoformed component enters the RTM mold, where glass, carbon, aramid, or combined fiber reinforcements are placed, and injection is carried out.

Depending on the application, the film typically used can consist of multiple layers of thermoplastics such as ABS, PMMA, and PC. What we need to pay attention to in this process is the adhesion between the resin and the plastic film. This process can be used to manufacture tractor hoods, bumpers, panels, fenders, passenger coach engine enclosures, visual communication signs, etc.

 

Composite Process

A composite process whose principle is to inject resin under low pressure with the assistance of vacuum into a mold consisting of a rigid part.

 

Gel coat is applied to it, and glass, carbon, aramid, or combined reinforcements (mats, fabrics, and cores) are deposited. The other part is flexible (a membrane) with channels that allow the resin to follow its flow and fill the entire mold cavity. This process is widely used in the wind energy and marine industries. Due to the high glass content (over 50%), it can produce high-performance parts.