The Forestry Forum is sponsored in part by:

iDRY Vacuum Kilns

Forestry Forum
Sponsored by:

TimberKing Sawmills

Toll Free 1-800-582-0470

LogRite Tools

Norwood Industries Inc.

Sawmill & Woodlot Magazine

Your source for Portable Sawmills, Edgers, Resaws, Sharpeners, Setters, Bandsaw Blades and Sawmill Parts

EZ Boardwalk Sawmills. More Saw For Less Money! sponsored by Northeast STIHL

Woodland Sawmills

Peterson Swingmills

 KASCO SharpTech WoodMaxx Blades


Sawmill Exchange

Michigan Firewood, your BRUTE FORCE Authorized Dealer


Council Tool

Baker Products


iDRY Wood Lumber Vacuum Drying for everyon

Author Topic: setting pitch  (Read 8081 times)

0 Members and 1 Guest are viewing this topic.

Offline Don_Lewis

  • Senior Member
  • ****
  • Posts: 270
  • Gender: Male
  • dry kilns, heat pumps
    • Share Post
    • nyle
Re: setting pitch
« Reply #20 on: February 25, 2006, 05:10:35 AM »
Pitch setting has to take into account what you will be doing with the lumber. If you are making a piece of pine furniture or flooring and sanding it a lot, the temperature under the sanding belt will be hot enough to quickly load the belt.  160F is the accepted temperature for that use of the lumber (not the air) for about 24 hours. The time depends on air temperature though.

Offline Don P

  • Senior Member x2
  • *****
  • Posts: 5010
  • Location: Southwestern VA
  • Gender: Male
    • Share Post
    • Calculator Index
Re: setting pitch
« Reply #21 on: February 25, 2006, 07:10:57 AM »
I'd like to understand this well enough to simplify it. I've understood pitch to be sorta like crude oil. If you had a tower to condense the volatiles as the were driven off there would be a range of by products that condense at different levels. If I'm anywhere close there must be a list of what is driven off at each temperature level. Is there a point, short of amber, where it is truly "dried up"? I guess the analogy would be, does it ever become thermosetting instead of thermoplastic?

Offline brdmkr

  • Senior Member x2
  • *****
  • Posts: 1719
  • Age: 53
  • Location: Georgia
  • Gender: Male
  • I need to slow down...
    • Share Post
Re: setting pitch
« Reply #22 on: February 25, 2006, 01:49:45 PM »
I thought Tom's explanation sounded a little like tempering metal.  Once metal is tempered, as I understand it, it will not loose its temper until it is heated above the temper temperature.  Also sounds somewhat like frational distillation as mentioed above.  Either way, sounds like if pine is exposed to temperatures above that used to set pitch, it may weep.
Lucas 618  Mahindra 4110, FEL and pallet forks, some cant hooks, and a dose of want-to

Offline beenthere

  • Senior Member x2
  • *****
  • Posts: 26964
  • Location: Southern Wisconsin, USA
  • Gender: Male
    • Share Post
Re: setting pitch
« Reply #23 on: February 25, 2006, 02:10:13 PM »
Interesting thread, and some of it is even understandable.  Thanks Tom.
south central Wisconsin
 It may be that my sole purpose in life is simply to serve as a warning to others

Offline Ianab

  • Administrator
  • *****
  • Posts: 12823
  • Age: 56
  • Location: Stratford , New Zealand
  • Gender: Male
  • Marmite on toast is a real breakfast
    • Share Post
Re: setting pitch
« Reply #24 on: February 25, 2006, 03:36:17 PM »
Code: [Select]
Is there a point, short of amber, where it is truly "dried up"? I guess the analogy would be, does it ever become thermosetting instead of thermoplastic?
I dont think so, if you take your piece of kiln dried pine and get it REALLY hot, like on a fire, the pitch will start running out again.
I think the crude oil analogy is a good one, crude oil is usually a waxy sort of sludge, if you let all the naptha and petrol evaporate out it will 'set', but it can still be melted if you warm it up. Heat it and take out the kerosene / diesel weight components then you have bunker oil that is a solid at room temp. One step more is tar, pretty much a solid, but even than it will melt in the sun on a really hot day.


Weekend warrior, Peterson JP test pilot, Dolmar 7900 and Stihl MS310 saws and  the usual collection of power tools :)

Offline Den Socling

  • Senior Member x2
  • *****
  • Posts: 4220
  • Age: 68
  • Location: Jersey Shore, Pennsylvania
  • Gender: Male
  • just wondering
    • Share Post
    • PC Specialties
Re: setting pitch
« Reply #25 on: February 25, 2006, 09:13:39 PM »

I'm sure that there are bonds between compounds that affect boiling point but don't you agree that Tom's explanation is basically correct? Guess what happens to 'pitch' in a vacuum chamber. I've taken pine that was dried to a max of 140'F in a vac chamber and heated pitch pockets to 190 and they stayed solid.


Offline jimF

  • Full Member x2
  • ***
  • Posts: 188
  • Location: VA
  • Gender: Male
  • Go for it!
    • Share Post
Re: setting pitch
« Reply #26 on: February 27, 2006, 08:30:47 AM »
Tom's explaination is the first step to understand what is going on.  But there is a strong interaction beteewn the pure chemicals in the mixture.  The remaining mixture will melt and flow at a temperature lower than the maximum temperature at which it was previously exposed to.

When it is exposed to the maximum temperature also influences how effective the "setting" process is.  If performed early in the drying cycle(when the MC is high) it is more effective than later (when the MC is low) because water is part of the mixture and it's boiling point also influences the boiling point of the mixture.

Share via delicious Share via digg Share via facebook Share via linkedin Share via pinterest Share via reddit Share via stumble Share via tumblr Share via twitter

Setting pitch in Nyle

Started by brdmkr on Drying and Processing

4 Replies
Last post April 07, 2009, 07:03:54 PM
by karl
Setting Pine Pitch

Started by Gunny on Drying and Processing

3 Replies
Last post February 25, 2005, 02:06:45 PM
by kilndry
Setting Pitch in Pine ???'s

Started by Woodey on Drying and Processing

3 Replies
Last post December 28, 2012, 08:29:12 PM
by GeneWengert-WoodDoc
setting pitch in timbers

Started by brdmkr on Drying and Processing

6 Replies
Last post November 03, 2007, 05:04:32 PM
by cantcutter

Powered by EzPortal