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Page | 31 Vacuum Bagging for Resin Infusion 11.2. VacuumBagApplication,Vacuumbaggingfilmisusedasthefinallayer,a vacuum is applied, the bag is pulled down and conforms appropriately to the tool and part. There are three basic methods of vacuum bagging, • Surface Bagging – where the film is sealed onto the mould tool surface using vacuum bag sealant tape. For this technique the mould tool must be completely vacuum tight to ensure no leakage and loss of vacuum. • Envelope Bagging – where the mould tool is placed inside a tubular vacuum bag and the ends of the tube are sealed using sealant tape. For this technique the mould does not need to be vacuum tight but must be able to withstand crushing. This technique can only be used when the tool is small and light enough to be lifted inside a vacuum film tube. • Internal Bagging – this is an advanced technique for the manufacture of hollow structures. The bagging film is drawn through the hollow structure and seals to either the outside of the mould tool or an external vacuum bag. In general, the same basic guidelines and techniques apply in both situations. The condition and configuration of the tool to be used will guide your decision to either surface bag or envelope bag.PDF Image | Vacuum Bagging for Resin Infusion
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