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PREHEATING THE LUMBER......................................................................................................................................46 WATER EVAPORATES FROM THE SURFACE AND LARGER PORES. ..........................................................................46 WATER EVAPORATES FROM SMALLER AND SMALLER PORES. ...............................................................................47 EVAPORATION OF WATER VAPOR FROM CELL WALLS. ..........................................................................................49 FINISHING DRYING. .................................................................................................................................................50 FACTORS THAT AFFECT THE DRYING RATE: Temperature, RH and Air Flow.......................................................... 58 AIR FLOW ON AIR DRYING YARDS ...........................................................................................................................58 STACKING ................................................................................................................................................................59 AIR FLOW IN KILNS. .................................................................................................................................................62 AIR FLOW AND TEMPERATURE READINGS..............................................................................................................62 DRYING PROCEDURES .......................................................................................................................................... 64 OKAY–YOU’VE BOUGHT SOME LOGS. .....................................................................................................................64 FOLLOWING AND CREATING DRYING SCHEDULES................................................................................................ 86 HOW DO CONVENTIONAL AND DEHUMIDIFICATION KILN SCHEDULES COMPARE? ..............................................87 WOOD GROUPS FOR DH KILNS ...............................................................................................................................89 MAXIMUM MOISTURE LOSS PER DAY.................................................................................................................. 91 WHAT SHOULD YOU DO WHEN DRYING APPEARS TO SLOW DOWN OR STOP? ................................................... 94 TROUBLESHOOTING A DRYING SLOWDOWN..........................................................................................................94 POTENTIAL SAMPLE BOARD PROBLEMS. ................................................................................................................94 INTERMEDIATE MOISTURE CHECKS ........................................................................................................................95 “FIXING” A SLOW-DRYING LOAD OF LUMBER (ACCELERATING A DRYING SCHEDULE............................................95 “SHOCKING THE KILN”.............................................................................................................................................98 STARTING THE DRY KILN: A STEP-BY-STEP GUIDE ................................................................................................ 99 AIR-DRIED LUMBER: ................................................................................................................................................99 GREEN LUMBER.....................................................................................................................................................102 APPENDIX A: A FEW MOISTURE CONTENT CALCULATION PROBLEMS FOR PRACTICE ........................................ 103 APPENDIX B: RH AND EMC TABLE FOR A RANGE OF DRY BULB TEMPERATURES AND WET BULB DEPRESSIONS 105 4PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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