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Outer Bag is collapsed onto the stiff perforated tool due to the atmospheric pressure outside the bags. Because of the vacuum differential between the two bags, the Inner Bag is “ballooned” and presses against the perforated stiff tool leaving no compaction force, while still producing vacuum, on the composite. In the DVB arrangement, the composite lay-up assembly is not compacted by the atmospheric pressure via the Inner Bag, and remains loose. Volatiles are free to escape by the vacuum suction from the Inner Bag vacuum pump during the B-stage. At the end of the B-stage, the Outer Bag is purged to atmosphere, while the Inner Bag vacuum is increased to 30” Hg. The Outer Bag becomes loose from the tool, and the Inner Bag collapses onto the caul plate with one atmospheric pressure. This pressure helps to consolidate the laminate during the high temperature ramp-and-hold period of the cure cycle. Vacuum Heating Chamber Inner Bag Chamber wall Inner Bag Vacuum On/Off Tool Plate Composite and Caul Plate Figure 4. Oven DVB concept applied to a vacuum heating chamber. The DVB process can be very flexible. For example, applying a partial vacuum (i.e., 25” Hg) to the Outer Bag, while pulling a full vacuum (i.e., 30” Hg) in the Inner Bag during the composite B-stage is also possible. In this case, The Outer Bag is collapsed onto the stiff perforated tool with a pressure Chamber (Outer Bag) Vacuum On/OffPDF Image | Evaluation of Double-Vacuum-Bag Process For Composite Fabrication
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