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3 Vacuum Bagging Molds Vacuum bagging molds vary widely in shape, size, and method of construction. Generally they are designed to perform two functions. They must hold the wet-out laminate in a spe- cific shape until the resin system has cured and form half of an airtight envelope that con- tains the laminate. Some small molds are designed to fit completely inside an envelope and only need to be rigid enough to hold the laminate’s shape. The mold surface must be airtight and smooth enough to prevent bonding to the laminate. Porous surfaces such as wood should be coated with epoxy or covered with a material such as plastic laminate to provide the necessary airtight surface. Each part produced in the mold will have a rough (bag) side and a smooth (mold) side. In most cases, the smooth, mold side of the laminated part will be its outer finished surface. Greater care in finishing a mold’s surface will result in a part with a smoother finish. A colored gelcoat can be applied before the laminate is laid in, leaving the outer surface of the laminate completely finished when it comes off the mold. The appropriate mold release, most commonly paste wax, will allow the laminate to release cleanly from the surface. The mold structure must be rigid enough to support the mold surface in its proper shape during the laminating process. Vacuum bagging molds take advantage of the fact that at- mospheric pressure is equal everywhere on the outside of the envelope. Atmospheric pres- sure on the back of the mold will counteract all of the clamping pressure on the face of the mold. A mold only needs to be strong enough to hold its shape against the springback of the material being laminated. The quantity and stiffness of the laminate, the degree of com- pounding of the mold shape, the size of the mold and the precision of the finished laminate are factors that increase the amount of reinforcing required to stiffen the mold. Molds should be at least 6" larger than the laminate on all sides to allow excess laminate for trimming and to provide a clean area around the perimeter to seal the bag to the mold. 3.1 Flat molds Vacuum Bagging Molds 10 Figure 3-1 A flat, smooth surfaced table is a versatile mold for a wide variety of projects. Several lay-ups can be completed at the same time. 3PDF Image | Vacuum Bagging Techniques 002150
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