Vacuum Infusion and Vacuum Pressing Processes
Vacuum Infusion and Vacuum Pressing Processes
Vacuum Infusion Process
The vacuum infusion process uses a perforated film that enables targeted venting while preventing uncontrolled suction of excess resin. This promotes an even resin distribution in the laminate and reduces the risk of porosity, which could compromise structural integrity.
The perforated film P1 is particularly suitable (more holes per m? compared to perforated film P3).
Vacuum Pressing Process
The vacuum pressing process uses a perforated film to remove excess resin from the laminate. This not only ensures an even distribution of the resin but also provides uniform pressure distribution across the surface. The film also protects the underlying layers (such as peel plies and breather fabrics) from mechanical damage during the process.
The perforated film P3 is particularly suitable (fewer holes per m? compared to perforated film P1).
Materials
FEP Fluoropolymer (Perforated Film P3)
- High-temperature resistance (up to 260 °C), suitable for autoclave and oven processes.
- Used in processes where high thermal loads are required.
Modified Polyethylene (Perforated Film P1)
- More cost-effective but with lower temperature resistance (approximately 125 °C).
- Suitable for applications with lower processing temperatures.
Selection Criteria
Component Geometry
The choice of hole size in the film depends on the geometry of the component. For delicate and complex components, smaller holes are required, while larger holes are used for thick or large-scale structures to ensure optimal venting and resin distribution.
Process Temperature
The choice of material is largely influenced by the maximum processing temperatures. Materials such as FEP Fluoropolymer are suitable for higher temperatures, while PE is used for lower temperatures.
Resin System
The viscosity of the resin used determines the hole size of the film.
For more viscous resins, smaller holes are required to ensure even distribution (R&G perforated film P1).
For less viscous resins, larger holes are better suited to transport the resin efficiently (R&G perforated film P3).
