Sampling pulpwood density

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• Subject: Sampling pulpwood density
• From: /S=R.CZAPLEWSKI/OU1=S28A@MHS-FSWA.ATTMAIL.COM
• Date: Thu, 7 Sep 1995 15:43:20 +0000
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  Jim Shirley posted the following inquiry:

  >Forestry  Corporation  of  New  Zealand  manages about 190,000 ha of radiata pine plantations. It
  produces about 1 million m3 of pulpwood each year from thinning and clearfelling.
  >
  >We need to be able to measure the changes in the basic density (Oven dry  weight/cubic  metre  of
  wood) of the pulpwood over time, as it leaves the forest.
  >
  >We  would  like to take wood samples from truckloads of logs as they leave the forest, and do the
  density analysis on these samples.
  >
  >We are looking for a mechanical device which will take these samples.  An increment borer is  not
  a  suitable  tool  because  it  doesn't  sample  the volume of the log in proportion to the radial
  variation in density in the log. Ideally the sample should be
  >wedge-shaped and at right angles to the long axis of the log.
  >
  >An article by Torborjn Okstad in Forest Products  Journal  (20:8,  1970)  describes  a  prototype
  machine which looked like a chainsaw and cut chips from a wedge-shaped section of the log.
  >
  >We  would  like  to  contact anyone who has had any experience or knowledge of such a tool and/or
  experience in sampling for basic density changes in the manner described.
  >
  >
  >Jim Shirley
  >Forest Resources & Valuation Mgr, Forestry Corporation of NZ Ltd, Rotorua, New Zealand
  >Email : shirleyj@fcnz.co.nz, and shirleyj@poly.waiariki.ac.nz,
  >


  >
  Kjell Pernestal replied:

  The problem of sampling truck loads has been tested in some projects in Sweden. I have myself been
  involved in one of the projects years ago.

  I suggest you try to contact prof Mats Nylinder, Swedish  University  of  Agricultural  Sciencies,
  S-750  07  UPPSALA,  e-mail  mats.nylinder@vl.slu.se.  I  do not know, however, if he is using his
  e-mail.



  The following reply is new contribution by Ralph Johnson:



From:      Ralph R. Johnson:W04A
Internet:  /s=r.johnson/ou1=w04a@mhs-fswa.attmail.com
Postmark:  Sep 05,95  1:22 PM          Delivered: Sep 05,95  1:27 PM
Status:    Previously read
Subject: Reply to: Forwarded: Re: Management: Sampling pulpwood density
-----------------------------------------------------------------------------
Reply text:
From: Ralph R. Johnson:W04A
Date: Sep 05,95  1:22 PM At the US Forest Service Forest Management Service Center, we've used
a xylodensiometer for estimating log weights.  The technique is to
use an increment borer and a float arrangement which has been
calibrated to the particular borers.  One uses a scale which has been
adjusted for heartwood and sapwood.  Basically you use a fixed core
length of heartwood and sapwood and access a chart which adjusts to
the tree's actual percent heartwood and sapwood.    Ralph Johnson

Preceding message:
From: Raymond Czaplewski:S28A
Date: Sep 05,95 11:55 AM
Ralph, here's reference on load scaling.

Previous comments:
From: Kjell Pernestel:X400
Date: Sep 01,95 12:35 PM
From:    C=US/ADMD=ATTMAIL/ORG=ATTMAIL/PN=Kjell Pernestel/
         DD.ID=internet(b)FYSIK.UU.SE(b)Kjell.Pernestal/

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