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4.1.3 An alternate vacuum bag system The following example demonstrates an alternative plumbing system that uses a perforated manifold inside the vacuum bag as a method to draw air from a long lay-up using a single vacuum port. The laminate is a structural panel using two layers of 110"-thick wood veneer and 12 oz fiberglass cloth in a partial cylinder, female mold. With a flat base plate under it, the manifold can be used directly over harder material like Douglas fir veneer. It is not used on soft materials where it can leave a permanent depression in the laminate. The manifold and plumbing are 3⁄4" PVC. Vacuum Bagging Applications 25 A manifold provides a rigid air path inside the vacuum bag to the port or place where the vacuum line pene- trates the bag. It is placed on top of the release fabric. When the manifold is placed on top of the laminate, rather than alongside the laminate, a plate under the manifold will distribute the pressure of the narrow mani- fold. A bubble-type breather material is placed over the release fabric and the manifold. Gaps between the bubbles pro- vide air channels to the manifold. Bubble-type material may be reused several times, but it does not absorb ex- cess epoxy. The vacuum line is then shoved into the coupling, sealing the bag between the vacuum line and the inside of the coupling. The vacuum pump is turned on, evacuating air from the bag through the manifold. A glue trap, seen here, prevents excess epoxy from being drawn through the plumbing. After the vacuum bag is in place, the vacuum line is con- nected directly to the manifold. The bag is pushed about 1⁄2" into the manifold coupling that is under the bag. The bag is then punctured inside the manifold coupling. 4PDF Image | Vacuum Bagging Techniques 002150
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