Bleeder / Breather fabrics

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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 resin bleeding through the perforated release film. As the bleeder has no release capability, a release film must be used against the component. 

 Bleeder/ breather fabrics are manufactured from needled, polyester fabric and they are used as a breather and absorption medium in composite vacuum bagging applications. The breather...

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