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Figure 3-6 complete. Vacuum Bagging Molds 14 Framing is being added to the bottom mold after lay-up is Figure 3-7 Legs and wheels are added to both mold halves. acts as an interface between the skin and the core material and helps to prevent the core from printing through to the inner surface of the mold. The next step is to apply 1" core material over the inside skin of the mold. Sand the fairing mixture to knock down any ridges or high spots and provide texture for good adhesion of the next layer. After cutting the honeycomb core material to fit the entire mold area, re- move a few pieces at a time and bond them back in position. Then apply a second 18" layer of epoxy/407 mixture over the cured epoxy/407 layer. Wet out the bottom contact side of the core material with unthickened epoxy and lay it into the fresh epoxy/407 mixture. Use weights to hold the core in position, firmly bedded in the thick epoxy/407 mixture until cured. After the core application has cured thoroughly and sharp or raised edges are faired, apply the outer fiberglass skin directly over the core. The outer skin should consist of several lay- ers of cloth, about equal to the thickness of the inner skin. When the outer skin has cured thoroughly, bond the support framework to the skin. The framework should support the mold shell at a convenient height and keep the mold from flexing when it is removed and placed right side up on the floor. The mold framework may be fixed to the floor or mounted on wheels, in which case a strongback may be needed to keep the mold rigid. The framework should be built over the mold shell before removing the mold from the plug. After the mold has cured thoroughly, remove it from the plug by carefully forcing wooden or plastic wedges between the edge of the mold and the plug. Then prepare the mold for vacuum bagging. Inspect the mold surface for pinholes or flaws which may be repaired with epoxy. Elevated temperature post-curing in molds The plug/mold construction and laminating procedures described in this manual are based on the use of room temperature cure epoxies and materials. Plugs, molds and laminates that will be post-cured or subjected to temperatures greater than 110°F (43°C) will require an alternate epoxy system and building method. High performance, low-viscosity epoxies are often used in vacuum bag laminating. These epoxies may require curing or post-curing at elevated temperatures. If the finished laminate is to be post-cured in the mold, special precautions must be taken when building and select- ing materials for the mold as well as the laminate. Molds must be built of materials and with techniques that enable the mold to withstand the elevated temperatures without distorting. And, if the mold must be post-cured on the plug, the same precautions must be taken when building the plug. 3.5 3PDF Image | Vacuum Bagging Techniques 002150
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