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4.3 Large scale vacuum bagging The limiting factors in the size of the lay-up include vacuum pump size, the shape and com- plexity of the mold, open time of the resin used, and the labor available to lay-up all of the composite and bagging material within the resin’s open time. This example shows the lay-up of a prototype 32' hull in the female mold shown in the pho- tographs in Section 3. The vacuum bagging procedure used here is the same basic proce- dure described earlier. Vacuum Bagging Applications 27 Figure 4-2 Fiberglass cloth is wet out in the bottom (hull) mold of the 32' catamaran after the cured epoxy gelcoat is washed and sanded. Figure 4-4 After applying an inner layer of fiberglass cloth, re- lease fabric is placed over the laminates. Figure 4-6 The laminate’s position is checked as the vacuum is being applied. Note that there is plenty of extra bag to allow for the depth of the mold. Narrow bag material can be joined with mastic into larger sheets. Figure 4-3 After laying in the outer layer of cloth, core materi- als are placed. Both foam and Douglas fir veneers are used where they are most appropriate. Figure 4-5 Breather material (bubble-type) is positioned over the release fabric after a manifold is in place. Figure 4-7 A finished laminated part (deck/cabin), suspended over the bottom (hull) mold. The mold also serves as a jig to hold the laminated hull in while interior components and the lami- nated deck are bonded in place. 4PDF Image | Vacuum Bagging Techniques 002150
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