Patent ID: 7360346

Claim:
A purging method for a portable type hermetically sealed container in use of a purging system, comprising: opening said portable type hermetically sealed container connected to said purging system through a sealing member, to communicate an interior of said portable type hermetically sealed container with an interior of the purging system to thereby form a hermetically sealed space; flushing, during a predetermined time from a start of purge, by supplying a predetermined gas to the interior of said hermetically sealed space at a first supply flow rate and exhausting the gas present in the interior of said hermetically sealed space to the exterior of said hermetically sealed space at a first exhaust flow rate; maintaining, after said predetermined time has elapsed, the supplying of the predetermined gas to the interior of said hermetically sealed space at a second supply flow rate and exhausting the gas present in the interior of said hermetically sealed space to the exterior of said hermetically sealed space at a second exhaust flow rate smaller than said first exhaust flow rate; and closing said portable type hermetically sealed container wherein at said flushing, said first supply flow rate and said first exhaust flow rate is controlled so as to keep a pressure in said hermitically sealed space at a predetermined value, wherein during said maintaining of supplying, said second supply flow rate and said second exhaust flow rate are controlled so as to keep a pressure in said hermitically sealed space at a predetermined value, and controlling said predetermined value of pressure at said flushing step and said predetermined value of pressure at said maintaining step at a constant value.