Factors affecting sawmill residue chip quality
<p>A study was conducted to determine the effects of knife angle, wood temperature, disk speed, anvil condition, and residue type, on loblolly pine sawmill residue chip quality. A 152-cm, six-knife, horizontal infeed, top-discharge chipper restored to factory specifications was used as the tes...
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ndltd-VTETD-oai-vtechworks.lib.vt.edu-10919-428772021-05-26T05:48:23Z Factors affecting sawmill residue chip quality Leary, Pamela S. Forestry lumber production LD5655.V855 1995.L437 <p>A study was conducted to determine the effects of knife angle, wood temperature, disk speed, anvil condition, and residue type, on loblolly pine sawmill residue chip quality. A 152-cm, six-knife, horizontal infeed, top-discharge chipper restored to factory specifications was used as the test machine. Chips were recovered after being blown 4m vertically through a cyclone settler onto a screen pack with the top screen blinded. OVersize chips were not re-chipped. Material types included cants as controls, slabs, edgings, and trim blocks. Chipper rim speeds included the manufacturerJs recommended 3,385 meters per minute along with 2,370 meters per minute and 1,693 meters per minute achieved by the drift-down method. Knife angles included 30, 31, 32, and 33 degree straight grinds. Wood temperatures ranged from arrbient temperatures of over 21 degrees C. through chilled (approximately +2 degrees C.) and frozen (-4 degrees C.). The chip distributions from chipping slabs and edgings were not significantly different from those of the cants. Less than 50 percent of the weight of the trim blocks was returned as acceptable chips in most trials. Reducing disk speed resulted in a major reduction in pin chips and fines. Knife angles had less effect on chip size distributions than any of the other variables tested. The percentage of pin chips and fines was greater for chilled and frozen wood than for wood at ambient summer temperature.</p> Master of Science 2014-03-14T21:37:02Z 2014-03-14T21:37:02Z 1995-03-05 2009-06-08 2009-06-08 2009-06-08 Thesis Text etd-06082009-142240 http://hdl.handle.net/10919/42877 http://scholar.lib.vt.edu/theses/available/etd-06082009-142240/ en OCLC# 34303725 LD5655.V855_1995.L437.pdf In Copyright http://rightsstatements.org/vocab/InC/1.0/ xiii, 114 leaves BTD application/pdf application/pdf Virginia Tech |
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lumber production LD5655.V855 1995.L437 Leary, Pamela S. Factors affecting sawmill residue chip quality |
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<p>A study was conducted to determine the effects of knife
angle, wood temperature, disk speed, anvil condition, and
residue type, on loblolly pine sawmill residue chip quality.
A 152-cm, six-knife, horizontal infeed, top-discharge
chipper restored to factory specifications was used as the
test machine. Chips were recovered after being blown 4m
vertically through a cyclone settler onto a screen pack with
the top screen blinded. OVersize chips were not re-chipped.
Material types included cants as controls, slabs, edgings,
and trim blocks. Chipper rim speeds included the
manufacturerJs recommended 3,385 meters per minute along
with 2,370 meters per minute and 1,693 meters per minute
achieved by the drift-down method. Knife angles included
30, 31, 32, and 33 degree straight grinds. Wood
temperatures ranged from arrbient temperatures of over 21
degrees C. through chilled (approximately +2 degrees C.) and
frozen (-4 degrees C.). The chip distributions from chipping
slabs and edgings were not significantly different from
those of the cants. Less than 50 percent of the weight of
the trim blocks was returned as acceptable chips in most
trials. Reducing disk speed resulted in a major reduction
in pin chips and fines. Knife angles had less effect on chip
size distributions than any of the other variables tested.
The percentage of pin chips and fines was greater for
chilled and frozen wood than for wood at ambient summer
temperature.</p> === Master of Science |
author2 |
Forestry |
author_facet |
Forestry Leary, Pamela S. |
author |
Leary, Pamela S. |
author_sort |
Leary, Pamela S. |
title |
Factors affecting sawmill residue chip quality |
title_short |
Factors affecting sawmill residue chip quality |
title_full |
Factors affecting sawmill residue chip quality |
title_fullStr |
Factors affecting sawmill residue chip quality |
title_full_unstemmed |
Factors affecting sawmill residue chip quality |
title_sort |
factors affecting sawmill residue chip quality |
publisher |
Virginia Tech |
publishDate |
2014 |
url |
http://hdl.handle.net/10919/42877 http://scholar.lib.vt.edu/theses/available/etd-06082009-142240/ |
work_keys_str_mv |
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