Resin Transfer Moulding
PROCESS
- RTM is a vacuum-assisted, resin transfer process with a flexible solid counter tool for the B-side surface compression.
- This process yields increased laminate compression, a high glass-to-resin ratio, and outstanding strength-to-weight characteristics.
- RTM parts have two finished surfaces.
- Reinforcement mat or woven roving is placed in the mold, which is then closed and clamped.
- Catalyzed, low-viscosity resin is pumped in under pressure, displacing the air and venting it at the edges, until the mold is filled.
- Molds for this low-pressure system are usually made from composite or nickel shell-faced composite construction.
ADVANTAGES
- Higher fiber volume laminate
- Volatile emissions like styrene are massively reduced
- Higher repeatability
- Less dependent on skills of operators
- Good surface finish on both the surface of product
- Fast cycle time
- Higher production rate with process automation
- Uniform part thickness can be achieved
DISADVANTAGES
- Limited to smaller components
- Expensive tooling cost
- Limitation on reinforcing materials due to flow and resin saturation
- It is recommended only when higher production volume is available
- Mould maintenance is High
BENEFITS
- Flexibility in reinforcing materials
- Can produce a very strong part
- Improved thickness variations over other low volume processes
LIMITATIONS
- Higher cycle times
- Higher cycle times
- Can produce some thickness variation
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