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Vacuum bagging and resin infusion are two processing methods that provide excellent fibre fractions, excellent laminate consolidation and improved strength-to-weight ratios when compared to hand lamination. This can be achieved with low capital expenses and is less labour intensive than hand laminated parts. The processes are principally suited for moulding low cost components that are too large and/or complex to be pressurized by means such as an autoclave or matched mould. The techniques utilize a flexible sealed bag under which a vacuum is drawn, hence applying an even pressure of up to 1 atmosphere to the laminate in the mould. The assembly can then be heated in an oven, as in the case when using prepregs, to promote flow and cure of the resin. The process requires low cost equipment and tooling and is capable of producing composite components of good quality. Successful vacuum bagging and infusion requires a high quality vacuum source and non crush plumbing into the vacuum bag.

  • Bleeder / Breather fabrics 

    Bleeder / Breather fabrics  (1)

    The breather and bleeder layer is usually a non-woven synthetic fiber material that comes in a variety of thicknesses and/or weights. Its purpose is to provide a continuous air path for pulling vacuum on the component. When the bag wrinkles against the hard laminate, it traps air and the breather prevents this from happening. The fabric will also absorb excess…
  • Hoses and fittings

    Hoses and fittings (6)

    Successful vacuum bagging and resin infusion requires a high quality vacuum source and plumbing into the vacuum bag. The vacuum source can be a vacuum pump or a less expensive compressor driven venturi pump. Strong vacuum piping that does not crush under vacuum is used to link the vacuum pump to the vacuum breach unit. Non-return, plug and socket couplings…
  • Infusion Mesh

    Infusion Mesh (1)

    Flow media is a unique concept to vacuum infusion and media such as infusion mesh aid resin flow and distribute the resin across the surface of the laminate. The flow mesh is typically laid as a single layer between or on top of the layers of reinforcement and it comes in several styles, from fast infusion times, to maximum conformability…
  • Peelply

    Peelply (2)

    Peelply is typically a woven nylon or polyester fabric that is laminated to the non tool surface of the composite part. The peelply absorbs excess resin and imparts a textured finished to the surface when removed, which minimises surface preparation before secondary bonding. The peelply can remain on the part, protecting it against further contamination, until bonding or painting. Typically…
  • Release Film

    Release Film (5)

    Release Films are typically placed directly in contact with the laminate. They separate the laminate from breather/bleeder fabrics, which have no release characteristics, while the thin plastic release film has been treated so it won't bond to the laminate. There are many types of release films available and selection will depend on such things as the cure temperature, pressure, complexity…
  • Sealant Tapes

    Sealant Tapes (2)

    Vacuum Bag Sealant Tapes are used to form a vacuum tight seal typically between the vacuum bagging film and mould tool for edge bagging and the bag film to bag film for envelope bagging. They are supplied in the form of an extruded rubber sealant strip which has the capability of forming a strong bond to a wide range of…
  • Vacuum Bag 

    Vacuum Bag  (2)

    A vacuum bag provides pressure and vacuum, which always results in a better quality laminate. Pressure compacts the laminate, providing good consolidation and interlaminar bonds. Vacuum draws out the volatiles and trapped air, resulting in a low void content. Both help to improve resin flow. The latest generation vacuum bags for ambient cure compete on cost with polyethylene sheet, but…
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