Patent ID: 7553435

Claim:
A method of molding an article comprising: (a) arranging first and second rigid mold sections in a spaced apart opposed relationship; (b) attaching a first membrane to the first mold section, the first member and the first mold section defining a first chamber; (c) attaching a second membrane to the second mold section, the second member and the second mold section defining a second chamber, the first and second members further defining a mold plenum between opposing surfaces of the first and second membranes; (d) filling and pressurizing the first and second chambers with a gas backing at a first gas pressure level; (e) injecting molding fluid into the mold plenum; (f) monitoring a flow rate of the molding fluid during injection into the mold plenum; (g) sensing at least one parameter to determine the amount of molding fluid injected into the mold plenum, wherein sensing the at least one parameter includes detecting displacement of molding fluid between the first and second fluid filled mold sections; (h) monitoring the gas pressure within the mold plenum; and (i) regulating the gas pressure within the first and second pressure chambers during the molding of the article.