TEMPERATURE CHANGES, ETC., DURING CANNING OPERATIONS. 23 



different initial temperatures on the rate of temperature change in 

 a No. 2 can of string beans packed rather closely and processed at 



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110° 

 100° 























































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T B 9 10 II 12 13 14 15 16 



7 IB 19 



Fig. 10. — Experimental time-ternperature curves for No. 2 cans of string beans, starting 

 ^t different uniform temperatures and processed at 116° C. Curve is also shown for 

 cooling in water at 25° C. Curve for can starting : A, At 23° C. ; B, at 40° C. ; C, at 

 50° C. ; D, at 60° C. ; E, at 70° C. ; F, at 80° C. ; G, at 90° C. ; II, at 100° C. ; X, at 

 116° C. and cooled in water at 25° C. 



116° C. The cooling curve for a No. 2 can cooled in water having a 

 constant uniform temperature of 25° C. is also given. 













































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TIME IN MINUTES 



Fig. 11. — Experimental time- temperature curves for string beans in quart glass jars, 

 starting at different uniform temperatures and processed at 100° C. Curve for jar 

 starting : A, At 20° C. ; B, at 40° C. ; G, at 60° C. ; D, at 80° C. ; E, at 90° C. 



In figure 11 are shown the experimental heat-penetration curves 

 for beans in a quart glass jar processed at 100° C. 



