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Figure 2-4 A typical large vacuum bagging operation. This 50' half hull lay-up requires multiple vacuum lines and ports. Note the dot pattern of resin bleeding through the perforated film. Figure 2-5 A hand operated impregnator. Fabric passes through an epoxy bath and a pair of rollers. The adjustable gap between the rollers controls amount of epoxy in the fabric. 2.3 Production equipment Additional equipment is available to help large custom or production builders laminate more efficiently. Production equipment of the types listed here can help the builder take better advantage of the resin system’s open time, reduce the labor required to produce a part, and laminate a part in less time. 2.3.1 Impregnators An impregnator is used to wet out reinforcing fabric. Fabric is pulled through a resin pud- dle, and squeezed between rollers set at a specific gap. The roller gap controls the amount of epoxy in the fabric (Figure 2-5). Hand operated impregnators are available from WEST SYSTEM. Air and electric powered machines are available from companies such as Venus Gusmer. See Appendix C for a list of vacuum bagging equipment and material suppliers. 2.3.2 Permanent vacuum bags Permanent vacuum bags, custom made to the shape of the part, can be used for a number of vacuum cycles. They are made of cured silicone rubber sheet, polyurethane sheet, and fiber reinforced versions of both. The bags are fastened to a rigid frame with an integral gasket that seals to the mold. The bag can be installed and sealed in a matter of minutes even on a very large part. These bags are rather expensive, but in the right production situation can readily pay for themselves. 2.3.3 Metering and mixing equipment Many types of metering pumps and mixing equipment are available to help a shop increase production. Calibrated gear pumps and positive displacement pumps are used to dispense the epoxy resin and hardener in the correct ratio. Static mixers on the output hoses blend the resin and hardener together. See Appendix C for a list of vacuum bagging material and equipment suppliers. If you are un- dertaking a large project and would like more information or assistance selecting or finding production equipment for your operation, call the WEST SYSTEM technical staff. Vacuum Bagging Equipment 9 2PDF Image | Vacuum Bagging Techniques 002150
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