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Seasonal steaming variation, solutionHow we avoid the seasonal steaming variations.This problem is most sevier when one tries to obtain a constant light coloring throughout the year. The problems comes for the conditions of the lumber at the loading of the steaming chamber, which on nearly all systems are also the conditions at the beginning of the steaming process. The two most extreme case is a summer day with lumber, which is 27C (80F) outside and a winter day with lumber, which is frozen to -10C (14F). Logically it would make a difference if the steaming process is started at 27C or -10C, especially on shorter steaming schedules for lighter color, where the core temperature will be much lower on the frozen lumber when the chamber temperature has been reached. Solution by kiln-direct. First and foremost the steam chamber controllers design by kiln-direct prepares the lumber to a operator specified condition. These operator specified conditions will normally be 20C and a waiting period of one hour before initiating the actual steaming process. In addition, the operator will choose a minimum core temperature, which must be achieved before the controller will initiate to process. This minimum temperature is normally set at 5C or 40F. By going through a preparation period, where several parameters must be met is essenstial for constact steaming quality irregardless of the incoming conditions, you will eliminated or minimize the possibility of producing different color when using the same steaming schedule. |
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