Patent ID: 8851879

Claim:
A double vacuum chamber resin infusion device configured for vacuum assisted resin infusion of a preform comprising: a mold; a preform located on the mold; an inner bag sealed to the mold and enclosing the preform and forming a first vacuum chamber, an outer bag sealed to the mold and enclosing the inner bag and forming a second vacuum chamber, wherein the first and the second vacuum chambers are configured to exert a compressive force on the preform during infusion of resin and curing of resin, wherein the compressive force comprises a caul effect, at least one vacuum pump coupled to the first vacuum chamber and the second vacuum chamber, the at least one vacuum pump configured to evacuate the second vacuum chamber to a pressure greater than the pressure in the first vacuum chamber so that a pressure is exerted on the inner bag; and a resin source coupled to the first vacuum chamber, wherein the resin source is configured to infuse the resin into the preform.