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Author Topic: Yellow pine drying and sterilization  (Read 1947 times)

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Offline Southside

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Re: Yellow pine drying and sterilization
« Reply #20 on: June 23, 2021, 11:55:40 PM »
More of a setting the pitch. 
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Offline GeneWengert-WoodDoc

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Re: Yellow pine drying and sterilization
« Reply #21 on: June 24, 2021, 09:06:43 AM »
Indeed, syp is a bit different than most other softwood species.  It shrinks a bit more when the MC changes, but more importantly, it warps when the MC changes.  This warp is due to the grain in the tree, especially the grain angles for the first 15 to 20 years.  Therefore, in addition to perfect stacking when drying, it is also very important to get as close to the final MC as possible. At the same time, drying under about 10% to 12% MC greatly increases machining defects, as the woods getting so much stronger and the grain angle factor too.  Planers, molders, routers, etc. need to be fairly powerful as the MC drops and strength increases.  The bottom line is that it is rare to find syp used for many wood products except structural pieces.

Regarding setting the pitch, for those folks not familiar with the process, the pitch or sap in syp is plentiful.  It consists of many different chemicals.   Some of these chemicals are fairly liquid and runny at room temperature.  Some are liquid at runny at cooler temperatures too. And some become liquid and runny at warmer temperatures.  This pitch can also migrate through paint and even plastic overlays.  The pitch interferes with gluing and also clogs up sandpaper.  It can coat saws and knives.  In the kiln, it can coat the walls.  When syp is used for firewood, the pitch can coat chimneys and create creosote as well, which in both cases is creating a fire hazard.  So, dusting drying, what we do is heat the wood to at least 160 F (180 F is even better and faster) which will evaporate the chemicals in,pitch that are liquid and runny at 100 F and maybe a bit hotter.  After 24 hours at 180 F and around 48 hours at 160 F for lumber under 2Ē actual thickness, the pitch or sap that remains in the wood will be hard at room temperature.  This process of evaporation is called "setting the pitch."  Should the Wood be subsequently heated in processing (such as heat from machining or sanding, or in a finishing oven), the heat can soften the remaining pitch and create issues when softened.  Of course, when cooled, the pitch hardens.a. Due to this softening, which can happen in a home when the wood is, for example, near a fireplace or indirect sunlight or has a hot pan on it, etc., we generally prefer 180 F treatment temperature "just in case,". Certainly 160 F is adequate. OST of the time.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline cabindoc

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Re: Yellow pine drying and sterilization
« Reply #22 on: June 29, 2021, 05:47:36 AM »
Subscribing
Scott  aka cabindoc  aka logologist at large
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Offline doc henderson

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Re: Yellow pine drying and sterilization
« Reply #23 on: June 29, 2021, 10:31:59 AM »
good to hear from you Gene.  
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Offline forrestM

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Re: Yellow pine drying and sterilization
« Reply #24 on: September 02, 2021, 12:12:40 PM »
@GeneWengert-WoodDoc 

With syp you donít need to worry about killing bugs? Is that true for ewp as well?

Thanks,
Forrest

Offline Larry

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Re: Yellow pine drying and sterilization
« Reply #25 on: September 02, 2021, 07:21:33 PM »
Also, for a house with wood heat, and minimal air conditioning, what should my final mc be for Virginia? My plan was to take it down to final mc, remove from the kiln, straighten to 5 1/2 inches, and take to my friend for tongue and groove and then install.

If your heating with a woodstove 24/7 I would be concerned about the significant cracks that will develop in 5 1/2" wide strips.  With minimal AC I can see the MC going from 9+ summer to 6 late winter.
Larry, making useful and beautiful things out of the most environmental friendly material on the planet.

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Offline GeneWengert-WoodDoc

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Re: Yellow pine drying and sterilization
« Reply #26 on: September 04, 2021, 09:16:08 AM »
There is basically only one insect that gets into DRY pineÖthe old house borerÖand it does not cause extensive damage and seldom is able to reproduce.  All other insects need wetter wood.  This is for the US and Canada.  Of course, we get the carpenter bees, but sterilization is not a solutionÖsame with termites.

Now, if we have ambrosia beetles and the wood is used in a wetter location, even with sterilization, insects can be expected.  This is why we use pressure treatment in wet locations and for ground contact.  Borates can be used when water will not leach out the chemical.  Getting borate deep into the wood can be an issue.in other words, borate treatment is often a multi day procedure.  Plus retrying after treatment may be necessary.

Bottom line is that sterilization for softwoods is not effective for protection of the wood used in wet locations.  Chemical methods, usually PROPER pressure treatment, will provide thirty years of protection or more.
Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline YellowHammer

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Re: Yellow pine drying and sterilization
« Reply #27 on: September 04, 2021, 10:30:48 AM »
I use heat as a means to routinely kill anything that has taken up homesteading in my air dried wood stacks and pallets. 

As Gene mentions, carpenter bees are very bad here until late summer, and they will bore into anything they can, even old pressure treated wood.  I have 8 traps hanging around my barn and they fill up. 

The bottom of my kiln is littered with all kinds of after air drying creepy crawlies, and includes hundreds of carpenter bees hidden in the wood and pallets, scorpions, mud dobbers, wasps of several species, hornets, black widows, mice, snakes, etc.

There is nothing worse than unstacking a pile of air dried stickered wood and having a scorpion crawl out and land on your foot, or bunch of hornets come boiling out at you.  So I heat sterilize everything, not matter what is is, take it out of the kiln, dead stack it immediately, and put it in stasis in the main building.

Setting the pitch in pine serves the same purpose.  It also simplifies the questions I get asked all the time from "green minded" customers.

Question #1:  "Is it kiln dried?"  Me: "Yes"
Question #2:  "Have any chemicals of any kind touched the wood? Has it been sprayed or treated?"    Me: "No"
Question #3:  "Has is been sterilized?  Is everything dead in it?"    Me: "Yes"
Question #4:  "How much does it cost?"  Me: "Not too much, let's load you up." :D     
YellowHammerisms:

Take steps to save steps.

If it wonít roll, its not a log; itís still a piece of tree.  Sawmills cut logs, not pieces of trees.

Kiln drying wood: When the cookies are burned, theyíre burned, and you canít fix them.  Donít burn the cookies.

Online WDH

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Re: Yellow pine drying and sterilization
« Reply #28 on: September 04, 2021, 10:54:11 AM »
  "How much does it cost?"  Me: "Not too much, let's load you up." :D    
Surely you donít expect me to believe that.  
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Offline YellowHammer

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Re: Yellow pine drying and sterilization
« Reply #29 on: September 04, 2021, 09:45:48 PM »

 "How much does it cost?"  Me: "Not too much, let's load you up." :D    
Surely you donít expect me to believe that.  


No, but all I need is for THEM to believe it!! :D :D :D :D
YellowHammerisms:

Take steps to save steps.

If it wonít roll, its not a log; itís still a piece of tree.  Sawmills cut logs, not pieces of trees.

Kiln drying wood: When the cookies are burned, theyíre burned, and you canít fix them.  Donít burn the cookies.

Offline customsawyer

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Re: Yellow pine drying and sterilization
« Reply #30 on: September 05, 2021, 07:56:48 AM »
I'm not "buying" that either.
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Offline forrestM

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Re: Yellow pine drying and sterilization
« Reply #31 on: September 12, 2021, 09:40:08 AM »
@GeneWengert-WoodDoc 

Just to clarify, sterilization will kill active insects - including termites. It just isnít necessary for dry pine, and wonít prevent further infestation from the pine borer you mentioned, termites in wet locations, or carpenter bees. 

Thanks!

Offline Crossroads

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Re: Yellow pine drying and sterilization
« Reply #32 on: September 19, 2021, 12:54:59 AM »
Sorry I canít add anything to this topic, but I sure appreciate the information being shared. 
2017 LT40 wide, Kubota l185dt, 2-036 stihl, 2001 Dodge 3500 5.9 Cummins, l8000 Ford dump truck, hr16 Terex excavator, Farmi logging winch, Valley je 2x24 edger, Gehl ctl65 skid steer


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