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Lavender CE Pty Ltd Guide to Vacuum Bagging Breather / Bleeder Fabric Non-woven polyester bleeder / breather fabrics are used to allow the free passage of air across the bag face of a laminate while under vacuum or autoclave pressure. This allows air and volatiles to be pulled from the laminate and an even pressure applied to it. The secondary use of these fabrics is the absorption of any excess resin which is bled from the laminate during cure. Various constructions are available and selection will depend on the temperatures and pressures they must withstand during the cure. Release Film Release films are used to control resin flow during cure and to release the vacuum consumable lay up from the laminate following cure. The particular film chosen will be dictated by the cure temperature, the shape of the component being laminated, the amount of resin bleed required, and the resin system involved. Various perforation patterns are available to govern the amount of resin bleed from the laminate during cure. Release Fabric Commonly known as peel plies, they are placed against the laminate to provide a moulded surface suitable for secondary bonding or painting. After peeling off from the laminate the fabric leaves an impression of its weave pattern. They can be applied dry or impregnated with the same resin as the laminate. Dry peel ply bleeds out a controlled amount of resin from the laminate without bonding to it. Impregnated peel ply does not bleed any resin from the laminate stack, which is particularly useful when processing thin laminates using zero bleed resin systems. Self Adhesive Tool Release Materials These materials are an alternative to release waxes and liquids, eliminating the need for repeat operations between cures. They can also temporarily seal porous tools, such as those constructed from wood or MDF. Tool release materials are available as either PTFE coated glass fabric, or un- reinforced skived PTFE film. Flash / Release Tape High temperature capable tapes used for the removal of resin flash at the edge of the laminate, holding the consumable package in place and taping down the pleats of the vacuum bag to prevent movement during autoclave curing. www.lavender-ce.com Page 2 of 3PDF Image | Guide to Vacuum Bagging
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