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6.3 Vacuum Bagging (Wet Lay-up) Description This is basically an extension of the wet lay-up process described above where pres- sure is applied to the laminate once laid-up in order to improve its consolidation. This is achieved by sealing a plastic film over the wet laid-up laminate and onto the tool. The air under the bag is extracted by a vacuum pump and thus up to one atmosphere of pressure can be applied to the laminate to consolidate it. Materials Options: Resins: Fibres: Cores: Primarily epoxy and phenolic. Polyesters and vinylesters may have problems due to excessive extraction of styrene from the resin by the vacuum pump. The consolidation pressures mean that a variety of heavy fabrics can be wet-out. Any. Main Advantages: i) Higher fibre content laminates can usually be achieved than with standard wet lay-up techniques. ii) Lower void contents are achieved than with wet lay-up. iii) Better fibre wet-out due to pressure and resin flow throughout structural fibres, with excess into bagging materials. iv) Health and safety: The vacuum bag reduces the amount of volatiles emitted during cure. Main Disadvantages: i) The extra process adds cost both in labour and in disposable bagging materials ii) A higher level of skill is required by the operators iii) Mixing and control of resin content still largely determined by operator skill iv) Although vacuum bags reduce volatiles, exposure is still higher than infusion or prepreg processing techniques. Typical Applications: Large, one-off cruising boats, racecar components, core-bonding in production boats. GTC-6-0417 - 49PDF Image | GUIDE TO COMPOSITES
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