dried yarns it is preferred that the yarns be kept at a moy higher than that at which complete consolidation of the polymer structure occurs it is generally believed that the moy should be maintained at greater than about 20 based on dry weight of the yarn for p aramid yarns the atmosphere in the creel is generally air with water but if desired or required for some particular purpose the air could be replaced by some other gas such as nitrogen or argon or the like feed yarns for the following examples were made in accordance with the procedures described in the above mentioned european patent application three feed yarns of poly p phenylene terephthalamide were used in the following examples as spun properties of those yarns are provided in table 1 below table 1______________________________________yarn inh vis tenacity modulus denier g dl gpd gpd ______________________________________a 400 5 5 26 5 550b 1150 5 4 26 7 530c 1435 5 4 26 5 520______________________________________ the feed yarn identified above as yarn b was subjected to a heat treating process as described in the above mentioned european patent application a warp composed of 48 ends of the yarn was heat treated in a 40 foot 12 2 meter oven at 650 u00b0 c 135 yard per minute 123 m m and under a tension of 2 2 grams per denier gpd the yarn residence time in the oven was about 6 seconds the oven was electrically heated and the yarns were heated primarily by radiant heat and only partially by convective heat the oven was continuously purged with.