ABSTRACTOn the basis of the straight‐line relationship between the F value and square of process time divided by 100 (th2· 10−2) found in this work, a new simple method was developed applying the principle of linear interpolation to estimate process time for a given F value, For calculating F value, the following equation was proposed: FZ250= 10(Tr — 250)/z(fh · Bh + fc · Bc). Concepts of functions Bh and Bc, and procedures for preparing tables of values of these functions are described
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