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Select and install your vacuum lines In traditional vacuum bagging, a Breather/Bleeder material is typically used to both absorb excess resin and drive vacuum throughout the laminate. Breather/Bleeder is typically not used in resin infusion. Instead, in VIP, the vacuum lines are extended within the sealed bag. Spiral tubing is ideal for this purpose. In order to achieve complete infusion, resin must be pulled to all corners of the laminate. Because the standard set-up infuses into the center of the laminate, spiral tubing would usually be placed around the flange. Once again, spiral tubing should always be wrapped in peel ply. When using spiral tubing, it may have a tendency to straighten out or not stay where you want it. The simplest way to counteract this is to use small pieces of sealant tape. Just ball it up, stick it to the tubing, and then stick it on the mold. Step 3 Vacuum Bag and Attach Your Resin Line Build your vacuum bag Once the dry materials are in place, it is time to build the vacuum bag. The bag should be tight, but still allow plenty of room for all the materials including networks of tubing. Too much or too little bag can result in resin pooling or improper infusion. Once the bag itself is built, attach tubing for the resin and vacuum lines. Be very careful when making cuts through the bag for these tubes. It is frequently these connections that spring leaks. Before the pump is switched on, it is important to clamp off the resin line. Because the vacuum is drawn before the introduction of resin, the resin tube will act as a temporary “leak” that Pg. 8 of 14PDF Image | Vacuum Infusion
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