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10. Once the bagging film is applied to the centers of the sealant tape the corners can now be applied. Remove the backing from one corner starting from the center of the sealant tape to the corner. Pull the vacuum bag tight and apply it. Do this for all four corner. The outcome should be a very tight vacuum bag with no creases. 11. To apply the probe tops to the probe bases you will need to cut two slits in the vacuum bag. These slits are located right at the hole of the probe base. (It is recommend to make an X or cross the slits so the probe top can be connected without force. 12. Once the probe top is in the slit it will need to be tightened with a quarter turn. (Do not over tighten the probe top as it could stretch the vacuum bag and cause a leak.) 13. Attach your vacuum hose and verify that you are pulling vacuum. Attach a vacuum gauge Tips 1. Use a bagging sweep to sweep over the sealant tape and vacuum bag to ensure that there are no leaks. 2. Make sure to always use a functional vacuum gauge. Any broken or worn vacuum gauges may need give you the correct reading. Vacuum Bagging Leak Check 1. A minimum of 22”Hg is required. 2. At sea level you should be able to pull 29”Hg. 3. To perform a vacuum bagging leak check you will need to remove the vacuum hose from the probe. You should not lose more than 2”Hg in five minutes. 4. If you are noticing that the vacuum is dropping fairly slow or rapidly apply the vacuum hose and use the bagging sweep to sweep over the sealant tape and vacuum bag to remove any creases or leaks. 5. Remove the vacuum hose again to see if there are any leaks left. 6. If there are no leaks your part is ready to be cured and can be placed in the oven staging area. 7. Your part will need to be marked on the vacuum bag with your Name, Date, Project, and Cure Profile. Cure Profile-Oven Curing Rev A1 Pacific Coast Composites | sales@pccomposites.com | 1.888.535.1810 | www.pccomposites.com © 2017 1. 2. 3. All parts will have a cure profile specific to them. The cure for this part will need to be cured at 250°F ±10°F for 90 minutes. That doesn’t mean that you set your oven to 250°F and it will be fine. The ramp up and ramp down of a part will affect the part integrity. 6 How-to Manufacture a Composite I-BeamPDF Image | Sandwich Panel
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