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Page | 21 Vacuum Bagging for Resin Infusion 8.4. Release Films Perforations, The choice of the perforation is dependent on the desired open area for air & volatile evacuation considered along with the acceptable level of resin bleed out from the laminate. Removal of Air, Water Vapour and volatile gases during the curing process is desirable to avoid trapped gases creating voids in the cured composite laminate. E.g. Phenolic resin systems create steam as a by-product of their curing process and this needs to be removed to prevent voids. Perforation styles P, P3 and P6 are common choices for pre-preg processing. • P perforation for good air removal and medium resin bleed • P3 perforation for good air removal and lower resin bleed • P6 allow air flow but low resin bleed net resin part moulding. • MP25 Micro-perforation is an ideal selection for vacuum debulking cycles, providing a large open area and very high hole density to ensure excellent removal of air from the lay-up. The Micro- perforation also prevents breather fibres adhering to the uncured pre-preg, avoiding contamination of the lay-up.PDF Image | Vacuum Bagging for Resin Infusion
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