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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Warren (Staff)	Warren (Staff) posted 6 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 8.5K	Looks leak free. What temperature are you working and curing at? How was the sheet like when demoulded? Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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Raf4C	R Raf4C posted 6 Years Ago HOT Post Details
R Group: Forum Members Posts: 12, Visits: 86	+x Warren (Staff) - 4/16/2019 9:15:34 AM Looks leak free. What temperature are you working and curing at? How was the sheet like when demoulded? Dear Warren, Thank you for your reply. I am working at room temperature (20-25 °C). I am curing at room temperature (even if the idea is to do a post cure in the oven according to the datasheet when I'll fix these issues). I am interested in mechanical properties and for this reason I am using a peel ply on both the surfaces in order to have the same surfaces. For this reason, I cannot see if I have some bubbles in the plate. However, the surface does not look uniform. As you were able to see from the previous figure, after the infusion I have no air bubbles, they came out later. I noted also some air bubbles in the inlet and outlet tubes (only on the composite plate side), I attach some pictures. I am producing a plate (30x30 cm) with glass fibres, and the pump that I am using is the DVP EC.20 (the industrial one sold by EasyComposite). Can this pump be too strong for my purpose?
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