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Les alignements des machines de la scierie

https://library.fpinnovations.ca/en/permalink/fpipub41743
Author
Pleau, J.H.
Date
March 1996
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Pleau, J.H.
Date
March 1996
Material Type
Research report
Physical Description
73 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Saws
Sawing
Saw mills
Canada
Series Number
Publication spéciale SP522F
E-2915
Location
Sainte-Foy, Québec
Language
French
ISBN
0864885222
ISSN
08250030
Abstract
L'alignement précis des équipements de coupe est un moyen recommandé pour assurer la maximisation du rendement matière et de la qualité des produits manufacturés. Les tendances de l'industrie s'orientent de plus en plus vers l'utilisation de scies minces et vers une réduction maximale des dimensions-cibles. Il est essentiel pour la qualité des produits désirés que les préposés de l'entretien et de l'alignement des machines fassent un ajustement de haute précision. Le succès d'un alignement précis dépend en grande partie de la précision des outils utilisés pour accomplir ce travail. Un niveau de précision est calibré de façon telle à permettre de mesurer les déviations du nivelage par unité de millième de pouce. Ce livre propose des formules pratiques que l'expérience en milieu de travail peut mettre à profit. Les méthodes d'alignement s'appliquent à l'ensemble de la machinerie des centres de transformation: équarrisseuse-déchiqueteuse ("Chipper Canter"), scie de tête à ruban avec le chariot, scie de tête à rubans jumelés ("Twin Band"), refendeuse verticale, refendeuse à ruban horizontal, scie de tête circulaire avec le chariot et déligneuse à scies multiples ("Bull Edger").
Scieries
Machines
Alignements
Sawmills
Equipment Adjustments
Forintek Canada Corp. - Publications
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An investigation into chipped surface quality problems at canter lines

https://library.fpinnovations.ca/en/permalink/fpipub5565
Author
Wang, A.
Szathmary, G.
Date
September 2001
Edition
37595
Material Type
Research report
Field
Wood Manufacturing & Digitalization
the heads Clean-up sawing for top boards Yes Yes No Yes No Species SPF and Fir/L SPF and Fir/L
Author
Wang, A.
Szathmary, G.
Date
September 2001
Edition
37595
Material Type
Research report
Physical Description
28 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Studs
Saw mills
Equipment
Sawing
Quality control
Qualitative analysis
Series Number
2166
W-1807
Location
Vancouver, British Columbia
Language
English
Abstract
The purpose of this study is to investigate and record the principal problems associated with chipped surface quality at canter lines and evaluate degrade and value losses due to these problems. Mill measurements were conducted in five member sawmills in British Columbia to evaluate the value losses and lumber degrades due to chipped surface defects. The test lumber was sampled from the planing mills to identify the chipping losses and main problems. The five types of chipped surface defects influencing lumber grade are: knot tear-out; failure to remove chipped spline channel; torn grain without knots; scalloping; and chipped thin end. Average value losses for all mills were $11.4/MBF and $12.6/MBF in freezing and non-freezing conditions respectively. Removing the non-freezing data from one mill changed this to $11.4/MBF and $9.0/MBF respectively. Knot tear out caused 60% of lumber to be degraded. On average, over 55% of knots had tear-out. 42.3% of trim length was caused by failure to remove chipped spline channel.
Sawing - Quality control
Defects - Knots
Sawmilling studies
Sawmills - Equipment
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Comparaison des différentes entrées d'équarrisseuses : débitage primaire

https://library.fpinnovations.ca/en/permalink/fpipub38973
Author
Bédard, P.
Fournier, Francis
Date
March 2007
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Bédard, P.
Fournier, Francis
Date
March 2007
Material Type
Research report
Physical Description
23 p
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Sawing
Series Number
E-4126
Location
Québec, Québec
Language
French
Abstract
Les technologies d’entrée d’équarrisseuse ont grandement évolué au cours des dernières années. Les systèmes autocentreurs mécaniques installés dans les années 70 à 90 sont maintenant remplacés par des systèmes sophistiqués permettant de contrôler l’alignement et la translation des billes. Bien que les systèmes optimisés permettent d’accroître le rendement, ils sont aussi également plus complexes et nécessitent un suivi et un entretien plus rigoureux que les systèmes simples autocentreurs. Cette étude vise à comparer quatre technologies d’entrée d’équarrisseuse de différentes époques, pour des billes de faible diamètre où le niveau d’optimisation est critique et où les erreurs de positionnement ont beaucoup d’impact. Les simulations théoriques des quatre technologies étudiées ont démontré qu’un système optimisé en translation et en alignement permettrait d’obtenir des revenus supplémentaires de 9 % par rapport à un système autocentreur à courroies. Le système optimisé en translation seulement permet quant à lui des revenus de 8 % plus élevés qu’un système autocentreur à courroies, et finalement un système autocentreur à rouleaux permettrait d’atteindre des revenus de 5 % plus élevés que le système autocentreur à courroies. Les résultats des évaluations de ces technologies en scierie ont démontré un écart de 8 % entre le système optimisé en translation et en alignement et le système autocentreur à courroies. L’écart entre le système autocentreur à rouleaux et le système autocentreur à courroie est demeuré à 5 %, alors que l’écart entre le système optimisé en translation et le système autocentreur à courroies s’est établi à 6 %. L’efficacité réelle des entrées d’équarrisseuse a varié de 91 % à 93 %, quel que soit le niveau technologique. L’efficacité a été influencée par les bris mécaniques, la variation sciage et les erreurs de rotation. L’évaluation des bris mécaniques causés par les équarrisseuses a permis d’estimer la perte à 11 $/Mpmp en moyenne. Les résultats sont cependant très variables, allant de 3 à 16 $/Mpmp. Ces défauts sont principalement attribuables aux paramètres de coupe et à l’entretien des couteaux plutôt qu’au niveau technologique des équipements. Trois des quatre machines auraient bénéficié de l’emploi de scies de pré-coupe pour minimiser les bris mécaniques, puisque la perte de copeaux attribuable aux traits de scies s’élève à 6 $/Mpmp. Les erreurs de rotation ont eu moins d’impact sur les entrées optimisées que les entrées autocentreuses mécaniques puisque celles-ci bénéficient d’une seconde optimisation, après rotation. Les simulations ont permis d’établir que l’efficacité pouvait être réduite de 7 % à cause des erreurs de rotation pour l’entrée autocentreuse à courroies, de 4 % pour l’entrée autocentreuse à rouleaux, et de 1 % seulement pour les deux types d’entrées optimisées.
Canter infeeds
Sawing - Breakdown
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Comparison between canter infeeds : primary breakdown

https://library.fpinnovations.ca/en/permalink/fpipub39003
Author
Bédard, P.
Fournier, Francis
Date
March 2007
Material Type
Research report
Field
Wood Manufacturing & Digitalization
to 93% independently of technology level, as it was determined by mechanical damage, sawing variation
Author
Bédard, P.
Fournier, Francis
Date
March 2007
Material Type
Research report
Physical Description
22 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Sawing
Series Number
General Revenue Project No. 4910
4910
Location
Québec, Québec
Language
English
Abstract
Chipper-canter infeed technology has changed greatly over recent years. The self-centering mechanical devices installed in the 1970-1990 period have been replaced with more sophisticated systems that also control log alignment and translation. These optimized systems allow for improved yield, but they are also more complex and require more attention and maintenance. The purpose of this study was to compare four different infeed systems illustrating infeed technology evolution over time, as applied to small logs, where optimization and positioning errors are more critical. Theoretical simulations of the four infeed types studied showed that a system optimized for both alignment and translation can produce 9% greater revenue than self-centering straps, as compared with 8% for a translation-only optimized system, and 5% for self-centering rollers. In mill tests, a system optimized for alignment and translation yielded 8% greater revenue than the basic self-centering straps, as compared to 6% for the translation-optimized system, and 5% for the self-centering roller device. Actual efficiency ranged from 91 to 93% independently of technology level, as it was determined by mechanical damage, sawing variation and rotation errors. According to our evaluation of mechanical damage to lumber in the canters, losses averaged $11/Mbf, but the results varied significantly, ranging from $3 to $16/Mbf. Defects were mostly related to cutting parameters and knife maintenance, rather than the technology level of the equipment. Of the four types of equipment in the study, three would have benefited from a pre-cutting saw to minimize damage, as the loss of chips associated with sawkerfs amounted to $6/Mbf. Rotation errors had less impact on optimized infeeds than on mechanical self-centering devices thanks to a second – post-rotation – optimization. Our simulations showed that rotation errors could reduce efficiency by 7% in the case of self-centering straps, 4% with self-centering rollers, but only 1% with optimized systems of both types.
Canter infeeds
Sawing - Breakdown
Documents
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Compte-rendu du séminaire sur la simulation dans l'industrie du sciage

https://library.fpinnovations.ca/en/permalink/fpipub41900
Author
Grondin, F.
Drouin, N.
Bédard, P.
Goulet, P.
Date
October 1999
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Grondin, F.
Drouin, N.
Bédard, P.
Goulet, P.
Date
October 1999
Material Type
Research report
Physical Description
25 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Digitalization
Subject
Simulation
Sawing
Optitek
Location
Sainte-Foy, Québec
Language
French
Abstract
Optitek
Simulation
Sawing
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Curve sawing and new technology: implementation benefits

https://library.fpinnovations.ca/en/permalink/fpipub38462
Author
Corneau, Yvon C.
Date
May 1991
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Corneau, Yvon C.
Date
May 1991
Material Type
Research report
Physical Description
57 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Computer Optimized Bucking (COB)
Curve sawing
Simulation
Sawing
SAWSIM (Computer program)
Optimization
Log conversion
Logs
Series Number
3743K440
E-1336
Location
Ottawa, Ontario
Language
English
Abstract
In an effort to promote the adoption of manufacturing strategies that more closely match the Eastern resource supply, simulation work was conducted with SAWSIM to investigate the benefits of implementing innovative conversion technologies such as: computer optimized bucking (COB), curve sawing technology, and cant optimization technology.
Simulation results for COB clearly indicate that the implementation of computer optimized bucking generates significantly better volume and value recovery than achievable from operator derived bucking solutions.
Comparison of curve sawing and cant optimization simulation results show that both technologies have the potential to improve present efficiency levels by at least 10 percent.
Documents
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Curve sawing of Eastern SPF sawlogs phase 1: occurrence and severity of sweep and crook

https://library.fpinnovations.ca/en/permalink/fpipub38343
Author
Corneau, Yvon C.
Date
February 1989
Material Type
Research report
Field
Wood Manufacturing & Digitalization
£ /o 7 o. pdf CURVE SAWING OF EASTERN SPF SAWLOGS PHASE I OCCURRENCE AND SEVERITY OF SWEEP
Author
Corneau, Yvon C.
Date
February 1989
Material Type
Research report
Physical Description
17 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Curve sawing
Defects
Pinus
Spruce
Spruce Pine Fir
SPF
Softwoods
Sawing
Logs
Canada
Series Number
3743K420
E-1090
Location
Ottawa, Ontario
Language
English
Documents
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Curve sawing technology for Canadian sawmills

https://library.fpinnovations.ca/en/permalink/fpipub5433
Author
Wang, S.J.
Munro, B.D.
Giles, D.R.
Wright, D.M.
Date
December 1989
Edition
36861
Material Type
Research report
Field
Wood Manufacturing & Digitalization
r , B.C. V6T 1X2 CURVE SAWING TECHNOLOGY FOR CANADIAN SAWMILLS by S . J . Wang, B.D. Munro
Author
Wang, S.J.
Munro, B.D.
Giles, D.R.
Wright, D.M.
Date
December 1989
Edition
36861
Material Type
Research report
Physical Description
33 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Sawing
Recovery
Series Number
W-709
Location
Vancouver, British Columbia
Language
English
Abstract
Summary included
Curve sawing
Recovery
Documents
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Determination of methods for increasing both yield and product value when converting low grade hardwoods to solid products

https://library.fpinnovations.ca/en/permalink/fpipub38525
Contributor
Forintek Canada Corp.
Date
1979
Material Type
Research report
Field
Wood Manufacturing & Digitalization
each bolt for simulated sawing. The optimum bolt values were obtained by "computer sawing" the bolt
Contributor
Forintek Canada Corp.
Date
1979
Material Type
Research report
Physical Description
1 v.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Yield
Value added
Sawing
Processing
Patterns
Hardwoods
Location
Ottawa, Ontario
Language
English
Abstract
Four-foot hard maple bolts, ranging in diameter from 6 to 16 inches, were produced from pulp wood and sawlogs. The bolts were live-sawn into 1-inch boards to identify the coordinates of each board defect in order to mathematically reconstruct each bolt for simulated sawing. The optimum bolt values were obtained by "computer sawing" the bolt models several times into dimension stock, squares or pallet stock using three sawing patterns; live, around and cant sawing. In the simulated sawing of the actual and theoretical bolts, live sawing consistently resulted in the highest product value. The only exception was for bolts containing a large amount of discoloured wood. In these cases, around and cant sawing performed better than live sawing. In general, liver sawing produced the highest product value for the following reasons; the production of wider boards allows a greater resawing flexibility, fewer saw cuts with less kerf loss and the production of fewer slabs. In-plant studies were conducted to determine the effect of the sawing pattern on productivity. Live sawing increased productivity by 18% for small diameter bolts and up to 30% for larger diameter bolts over the other sawing patterns. While multi-pass systerms may be suitable for the larger, higher quality bolts, it is doubtful that such a system would be viable processing small diameter material down to 6 inches. In processing smaller diameter bolts, it is necessary to have a single-pass system with high productivity to offset the lower quality and value of this material.
Lumber Processing
Hardwoods
Yield
Value
Dimension stock
Sawing Patterns
Defect detection
Documents
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Development and mill trials of an active guide system for bandsaws (final report)

https://library.fpinnovations.ca/en/permalink/fpipub37418
Author
Taylor, J.
White, J.
Date
October 1996
Material Type
Research report
Field
Wood Manufacturing & Digitalization
and the sawblade deviation, the reduction in cutting bias being accompanied by a similar reduction in sawing
Author
Taylor, J.
White, J.
Date
October 1996
Material Type
Research report
Physical Description
19 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Stresses
Band saws
Saw bands
Saws
Bands
Blades
Sawing
Series Number
W-1330
Location
Vancouver, British Columbia
Language
English
Abstract
Research into the cutting characteristics of bandsaws has shown that the average cutting path of the sawblade is biased to one side of the ideal cut path. It has also been shown that a strong correlation exists between this cutting bias and sawblade deviation. This report is the second on the topic of bandsaw cutting bias and describes the development and mill trials of a PC based, self aligning bandsaw guide system. This system uses data from the sawblade, and programmable logic controllers controlling the bandmill, to monitor bandsaw cutting behaviour and align the guides to minimize the cutting bias and sawblade deviation. The system is shown to effectively reduce sawblade deviation and unscheduled blade changes and compensate for damaged or poorly prepared blades.
Saws - Band
Sawing - Blades
Cutting - Stresses
Documents
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76 records – page 1 of 8.