Wood Drying Topics > General Discussion

Brown Stain in Ponderosa Pine

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robshow:
Could anyone suggest a schedule that you are using for limiting brown stain?
Recently i have researched the issue and attempted to adjust some schedules but have not seen any difference.
We use double track LSI kilns with line shaft fans 100' and also double track Wellons with cross shaft fans 66'.
The Brown stain occurs in both types on kilns in shop 5/4, 6/4, 8/4 (worst in the 8/4)
Im getting ready to use a schedule that is published in the book KILN-DRYING WESTERN SOFTWOODS by Edwin Knight,  it states that it is a 6/4 schedule that will limit brown stain.
Any suggestions?

HencoV:
Hi Robshow,

What is your current kiln schedule? Also what air speeds do you get on the exit side?

robshow:
Thanks for the reply.
Not sure how to answer the first question, do you want me to describe BD WB and time at each step.
Air flow is average of 725.

HencoV:
If you can, post a screenshot of the process graph for one batch..showing set point and actual values

robshow:
Here is the schedule we use on 6/4 shop.

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