Air bubbles in the composite laminates

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Air bubbles in the composite laminates

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Raf4C	R Raf4C posted 6 Years Ago HOT Topic Details
R Group: Forum Members Posts: 12, Visits: 86	Hi guys, I am trying to prepare composite laminates with resin infusion process. I am using the resin IN2 coupled with slow hardener. Unfortunately, I got many bubblea in two laminates and I do not understand why. I degas the resin+hardener compound before infusion. Here a quick description of the procedure I follow (that is the same of the video you posted on YouTube. 1) the resin flows through the fibers 2) I lock the inlet pipe (resin side) 3) I close the pipe outlet (catch pot side) after few minutes. I am almost sure that I have no air losses in my bag because I did different verifications. The bubbles appears between point 2 and 3. Do I wait too much between point 2 and 3? Could be the air trapped in the pipe between the clamp and the resin at the beginning of the process? I am attaching some figure of the laminates at the end of the process. Thank you in advance and congratulations for this important forum. Raffaele
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Raf4C	R Raf4C posted 6 Years Ago HOT Post Details
R Group: Forum Members Posts: 12, Visits: 86	+x Legoman - 4/10/2019 7:48:34 PM "3) I close the pipe outlet (catch pot side) after few minutes." It should be few seconds! If the mixed resin is degassed properly and the vacuum is perfect and drop tested no way there are so many bubbles in your bag... Thank you, I'll try to lock it after few seconds. Why does it make bubbles if I leave it for some minutes?
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Legoman	Legoman posted 6 Years Ago HOT Post Details
Group: Forum Members Posts: 29, Visits: 622	+x Raf4C - 4/10/2019 7:59:52 PM +x Legoman - 4/10/2019 7:48:34 PM "3) I close the pipe outlet (catch pot side) after few minutes." It should be few seconds! If the mixed resin is degassed properly and the vacuum is perfect and drop tested no way there are so many bubbles in your bag... Thank you, I'll try to lock it after few seconds. Why does it make bubbles if I leave it for some minutes? It doesnt make air bubbles just the pump simply sucks out too much resin from your lamiate and some spots will be resin poor. I think... If you close both of the sides and air bubbles still coming then your bag is leaking or the resin degassing is not 100%.
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