Patent ID: 8628639
Filing Date: 2014-01-14
Classification: B29C

Abstract:
1. A method of processing a workpiece, comprising: placing the workpiece on a base; placing a first vacuum bag over the workpiece on the base; forming an inner seal between the first vacuum bag and the base around the workpiece; forming an outer seal between the first vacuum bag and the base extending around the inner seal, including forming a channel between the inner seal and the outer seal, the inner seal and the outer seal comprising a polymeric material prone to out-gassing when heated under ambient or near-ambient conditions; evacuating air from the channel; placing a second vacuum bag over the first vacuum bag; sealing the second bag to the base around an entire periphery of the workpiece; drawing a vacuum in the second vacuum bag to relieve pressure applied to the workpiece by the first vacuum bag; and venting the second vacuum bag to an atmosphere.