RTM is a similar technique to the RTM light. Difference is that we work with solid heated under and upper mold often milled (but can also being constructed in epoxy composite material).
After applying the gelcoat and insert the fibers, we inject the resin using an injection pump.
This technique makes it possible to use higher injection pressures.
Low pressure injection (0.2 – 5 bar) of liquid resin.
Closed mold system, mold is heated.
Fiber reinforcement is placed before closing the mold.
All type of reinforcements are possible.
Good mechanical properties, depend of type fiber reinforcements used we can go up until 35%.
Clamping force is needed.
Advantages of this technique
Sandwich-construction is possible;
Inserts can be integrated;
More parts, until 16 parts a day/shift depending of using gelcoat or not; cooling jig is necessary;
Thickness accuracy up until +/-0.35mm;
Thickness of the part is defined by mold design (stiff block mold).