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The SVB assembly and process, without the application of external pressure, are simply not flexible enough for high performance composite fabrication. A schematic drawing illustrating the concept of the DVB molding assembly for volatile management and composite manufacturing is shown in Figure 3. Fiber reinforced reactive resin matrix prepregs are laid up between the caul and the tool steel plates. They are then enclosed by a vacuum bag (designated as Inner Bag), which is sealed around the edges onto the tool plate. A vacuum port is built on the tool plate inside the Inner Bag and connected to a vacuum pump as with the SVB process. A second vacuum bag (designated as Outer Bag) is then assembled in the same fashion, with a vacuum port built on the tool plate, which is located between the Inner and Outer Bags and connected to a separate vacuum pump. Before assembling the Outer Bag, a perforated tool is first installed outside the perimeter of the Inner Bag. This tool has to be stiff enough to withstand the 14.7 Psi atmospheric pressure created by the vacuum. For the high temperature (371°C curing) resin systems, a Kapton“ film of 0.002” to 0.003” in thickness is used as bagging material. This DVB assembly is then placed in a heating chamber and subjected to the proper cure cycle for composite manufacturing. Outer Bag Inner Bag Ambient Pressure (14.7 Psi) Outer Bag Vacuum On/Off Inner Bag Vacuum On/Off Composite and Caul Plate Figure 3. Schematic DVB assembly. During the B-stage (i.e., the low temperature ramp-and-hold period), full vacuum (30” Hg) is applied to the Outer Bag, while a slightly lower vacuum level (i.e., 28” Hg) is set in the Inner Bag. The Perforated Steel ToolPDF Image | Evaluation of Double-Vacuum-Bag Process For Composite Fabrication
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