Effects of selected factors on sawmill residue wood chip quality
<p>This study examined the effects of disk speed, temperature and anvil condition on chip size from sawmill residues of Loblolly pine (<i>Pinus taeda</i> L.). Objectives were: 1) to document the effects of disk speed, temperature and anvil condition on the amount of over thick, ove...
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| Format: | Others |
| Language: | en |
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Virginia Tech
2014
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| Online Access: | http://hdl.handle.net/10919/41810 http://scholar.lib.vt.edu/theses/available/etd-03302010-020129/ |
| Summary: | <p>This study examined the effects of disk speed,
temperature and anvil condition on chip size from sawmill
residues of Loblolly pine (<i>Pinus taeda</i> L.). Objectives
were: 1) to document the effects of disk speed, temperature
and anvil condition on the amount of over thick, oversize,
accept, pin and fine chips produced from edgings, 6"x6"
cants and trim blocks and 2) to recommend changes in
processing sawmill residues to minimize the production of
over thick, pin and fine chips. Ten trials were conducted
at the Chesapeake Corporation's West Point, Virginia
hardwood sawmill using a Fulghum Industries 60-in.
(152-cm) diameter, six-knife, vertical disk chipper.</p>
<p>
Tests were conducted at approximately 80, 70, 60, 50
and 40% of the full disk speed of 707 rpm for the three
material types. It was found that decreasing disk speed
decreases the amount of pin and fine chips and increases
the amount of over thick chips for all material types. The maximum amount of accept and oversize chips was obtained at
50% disk speed. If 50% efficient secondary processing of
the over thick chips is achieved, the maximum amount of
oversize and accept chips would be produced at 40% disk
speed.</p>
<p>
All frozen and chilled residue types tended to
produce less oversize chips and significantly more pins and
fines than wood at ambient temperature.</p>
<p>
A worn anvil caused a significant increase in pins
and fines while causing a significant decrease in oversize
chips from the cants.</p>
<p>
Design changes are suggested to reduce the amount of
over thick chips produced by vertical disk chippers.</p> === Master of Science |
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