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Page | 23 Vacuum Bagging for Resin Infusion 9. Breather & Bleeder Fabrics A non woven fabric positioned over the release film which provides an air path over the entire laminate surface to ensure complete removal of air and application of vacuum & autoclave pressures. 9.1. Breather & Bleeder Fabric Selection, wide ranges are available offering a range of performance and pricing level. In order to make a technically suitable and cost effective selection the following factors should be considered. • Temperature Performance, dependant on the cure temperature and length of cure cycle. Selection should be made to ensure air flow is maintained throughout the curing cycle. • Pressure Performance, for high pressure cure cycles selection of a high air flow breather version can be considered. • Fibre Type, Denier and Weight, fabrics of differing construction are available to provide differing temperature and pressure performance. • Fire retardant properties, at elevated temperatures in high pressure autoclaves this is a desirable feature to prevent ignition occurring and to avoid the potential damage of an autoclave fire. • Stretch, Drape and elongation, when vacuum bagging complex shapes it is desirable to have fabrics with stretch and drape. This allows wrinkle free application over the part surface and helps avoid bridging conditions in sharp corners.PDF Image | Vacuum Bagging for Resin Infusion
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