Vacuum Injection and Vacuum Infusion Processes

Vacuum Injection Process

The perforated film in the vacuum injection process allows for targeted venting without uncontrolled resin removal. This results in an even resin distribution in the composite and prevents the formation of voids that could compromise the laminate’s mechanical properties.

Vacuum Infusion Process

The vacuum infusion process uses perforated film to remove excess resin while ensuring an even pressure distribution across the laminate. Additionally, the film protects underlying layers, such as release films and venting fabrics, from mechanical damage, thus securing the quality of the final product.

Materials

Polyamide (PA) or Polyester (PET)

• High temperature resistance (up to 200 °C), ideal for applications in autoclave and oven processes.
• Used in processes requiring high thermal loads.

Polyethylene (PE)

• More cost-effective than PA and PET, but with lower temperature resistance (around 120–150 °C).
• Used in processes with lower temperature requirements.

Selection Criteria

Component Geometry

The hole size in the film should be matched to the geometry of the component. Smaller holes are required for delicate parts, while larger holes are used for thicker or larger components to ensure efficient venting and resin distribution.

Process Temperature

The choice of material is critical for the temperature resistance of the process. Materials like PA or PET are suitable for higher temperatures, while PE is used for processes with moderate temperature requirements.

Resin System

The hole size in the film must be adjusted depending on the viscosity of the resin used. Low-viscosity resins require larger holes for efficient distribution, while more viscous resins require smaller holes to ensure controlled injection and even distribution.