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Eseentially they are bagged and put under presuure while curing to eliminate any bubbles etc and to assure the best bonding of the epoxy matrix to the fibers. An autoclave is a general term for something like a pressure cooker. It doesn't take much extra pressure in some cases. the trick is to be sure there is no leakage of the outside high pressure air into the inside of the bag. its the difference between inside the bag and outside the bag that does all the good.
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