CA2581427A1 - Method for reducing warp potential within lumber derived from a raw material - Google Patents

Method for reducing warp potential within lumber derived from a raw material Download PDF

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Publication number
CA2581427A1
CA2581427A1 CA 2581427 CA2581427A CA2581427A1 CA 2581427 A1 CA2581427 A1 CA 2581427A1 CA 2581427 CA2581427 CA 2581427 CA 2581427 A CA2581427 A CA 2581427A CA 2581427 A1 CA2581427 A1 CA 2581427A1
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Canada
Prior art keywords
measurement
log
stem
examining
cutting
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2581427
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French (fr)
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CA2581427C (en
Inventor
Mark A. Stanish
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Weyerhaeuser NR Co
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Weyerhaeuser Co
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Filing date
Publication date
Application filed by Weyerhaeuser Co filed Critical Weyerhaeuser Co
Priority to CA 2736343 priority Critical patent/CA2736343C/en
Publication of CA2581427A1 publication Critical patent/CA2581427A1/en
Application granted granted Critical
Publication of CA2581427C publication Critical patent/CA2581427C/en
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
    • B27B1/007—Methods for subdividing trunks or logs essentially involving sawing taking into account geometric properties of the trunks or logs to be sawn, e.g. curvature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y10T83/0405—With preparatory or simultaneous ancillary treatment of work

Abstract

Methods for reducing warp potential of lumber derived from a raw material, such as a log or stem are provided. The methods involve examining the log or stem for shrinkage properties and/or properties of spiral grain. The location of the shrinkage properties and/or properties of spiral grain determine how the log is oriented relative to a cutting device. In another embodiment, these characteristics determine what cutting pattern is selected for creating the lumber. In the case of a stem, these characteristics determine how the stem will be bucked.

Claims (23)

1. A method for reducing warp in lumber derived from a log, the method comprising the steps of:
examining the log to determine shrinkage properties of the log;
orienting the log with respect to a cutting device wherein the orientation is based on a location of the shrinkage properties to reduce warp of the lumber derived from the log when the cutting device contacts the log; and cutting the log using the cutting device to create the lumber.
2. The method of Claim 1 wherein examining the log includes obtaining one or more measurements from the group consisting of: microfibril angle measurement, moisture content measurement, electrical property measurement, structural property measurement, acousto-ultrasonic property measurement, light scatter (tracheid-effect) measurement, grain angle measurement, shape measurement, color measurement, spectral measurement and defect maps.
3. The method of Claim 1 wherein the cutting device has one or more cutting surfaces and further wherein the log is oriented with respect to those cutting surfaces.
4. The method of Claim 1 further comprising the step of:
creating a sound velocity map after the step of examining the log to determine shrinkage properties of the log.
5. The method of Claim 1 wherein the warp is crook.
6. The method of Claim 1 wherein the warp is bow.
7. The method of Claim 1 wherein orienting the log is also based on finite element modeling of the log.
8. A method for reducing warp in lumber derived from a log, the method comprising the steps of:
examining the log to determine one or more properties of spiral grain within the log;

orienting the log with respect to a cutting device, wherein the orientation is based on the one or more properties of spiral grain, to reduce warp of the lumber derived from the log; when the cutting device contacts the log; and cutting the log using the cutting device to create the lumber.
9. The method of Claim 8 wherein examining the log includes obtaining one or more measurements from the group consisting of: microfibril angle measurement, moisture content measurement, electrical property measurement, structural property measurement, acousto-ultrasonic property measurement, light scatter (tracheid-effect) measurement, grain angle measurement, shape measurement, color measurement, spectral measurement and defect maps.
10. The method of Claim 8 wherein one of the properties is spiral grain angle.
11. The method of Claim 8 wherein one of the properties is location of the spiral grain.
12. The method of Claim 8 wherein the cutting device has one or more cutting surfaces and further wherein the log is oriented with respect to those cutting surfaces.
13. A method for optimizing stem merchandizing, the method comprising the steps of:
examining the stem to determine shrinkage properties within the stem;
determining one or more locations at which to buck the stem, based on a location of the shrinkage properties, to reduce warp of lumber derived from the stem;
and bucking the stem at the one or more locations.
14. The method of Claim 13 wherein the one or more locations are also determined by a manner in which a log derived from the stem is subsequently processed.
15. The method of Claim 13 wherein examining the stem includes obtaining one or more measurements from the group consisting of: microfibril angle measurement, moisture content measurement, electrical property measurement, structural property measurement, acousto-ultrasonic property measurement, light scatter (tracheid-effect) measurement, grain angle measurement, shape measurement, color measurement, spectral measurement and defect maps.
16. A method for optimizing stem merchandizing, the method comprising the steps of:

examining the stem to determine one or more properties of spiral grain in the stem;
determining one or more locations at which to buck the stem, based on the one or more properties of spiral grain, to reduce warp of lumber derived from the stem; and bucking the stem at the one or more locations.
17. The method of Claim 16 wherein the one or more locations are also determined by a manner in which a log derived from the stem is subsequently processed.
18. The method of Claim 16 wherein examining the stem includes obtaining one or more measurements from the group consisting of: microfibril angle measurement, moisture content measurement, electrical property measurement, structural property measurement, acousto-ultrasonic property measurement, light scatter (tracheid-effect) measurement, grain angle measurement, shape measurement, color measurement, spectral measurement and defect maps.
19. A method for reducing warp in lumber derived from a log, the method comprising the steps of:
examining the log to determine shrinkage properties of the log;
selecting a cutting pattern for the log from a plurality of cutting patterns, wherein the selection is based on a location of the shrinkage properties within the log, to reduce warp of the lumber derived from the log when the log is cut; and cutting the log using the cutting pattern to create the lumber.
20. The method of Claim 19 creating a sound velocity map after the step of examining the log to determine shrinkage properties of the log.
21. The method of Claim 19 wherein examining the log includes obtaining one or more measurements from the group consisting of: microfibril angle measurement, moisture content measurement, electrical property measurement, structural property measurement, acousto-ultrasonic property measurement, light scatter (tracheid-effect) measurement, grain angle measurement, shape measurement, color measurement, spectral measurement and defect maps.
22. A method for reducing warp in lumber derived from a log, the method comprising the steps of:

examining the log to determine one or more properties of spiral grain within the log;

selecting a cutting pattern for the log from a plurality of cutting patterns, wherein the selection is based on the one or more properties of spiral grain within the log, to reduce warp of the lumber derived from the log when the log is cut; and cutting the log using the cutting pattern to create the lumber.
23. The method of Claim 22 wherein examining the stem includes obtaining one or more measurements from the group consisting of: microfibril angle measurement, moisture content measurement, electrical property measurement, structural property measurement, acousto-ultrasonic property measurement, light scatter (tracheid-effect) measurement, grain angle measurement, shape measurement, color measurement, spectral measurement and defect maps.
CA 2581427 2006-03-30 2007-03-12 Method for reducing warp potential within lumber derived from a raw material Active CA2581427C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2736343 CA2736343C (en) 2006-03-30 2007-03-12 Method for optimizing stem merchandizing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/393,992 2006-03-30
US11/393,992 US8662121B2 (en) 2006-03-30 2006-03-30 Method for reducing warp potential within lumber derived from a raw material

Related Child Applications (1)

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CA 2736343 Division CA2736343C (en) 2006-03-30 2007-03-12 Method for optimizing stem merchandizing

Publications (2)

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CA2581427A1 true CA2581427A1 (en) 2007-09-30
CA2581427C CA2581427C (en) 2011-06-21

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CA 2736343 Active CA2736343C (en) 2006-03-30 2007-03-12 Method for optimizing stem merchandizing
CA 2581427 Active CA2581427C (en) 2006-03-30 2007-03-12 Method for reducing warp potential within lumber derived from a raw material

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US (2) US8662121B2 (en)
BR (1) BRPI0701803A (en)
CA (2) CA2736343C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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US7938156B2 (en) 2006-04-20 2011-05-10 Weyerhaeuser Nr Company Method for optimizing lumber

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US20100332438A1 (en) * 2009-06-29 2010-12-30 Weyerhaeuser Nr Company Methods for Predicting Warp of a Wood Product Produced from a Log
FI125589B2 (en) 2013-04-08 2022-03-31 Stora Enso Oyj Methods of deoxygenating bio-based material and production of bio-based terephthalic acid and olefinic monomers
FI20135415L (en) * 2013-04-23 2014-10-24 Raute Oyj A method for cutting a log in a way that optimizes veneer yield
US10041251B2 (en) * 2015-11-13 2018-08-07 Mid-Columbia Lumber Floor joist
WO2020123566A1 (en) * 2018-12-10 2020-06-18 Usnr, Llc Wetwood detection in sawn or planed wood products

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US9033008B2 (en) 2006-04-20 2015-05-19 Weyerhaeuser Nr Company Method for optimizing lumber derived from a log

Also Published As

Publication number Publication date
CA2736343C (en) 2012-09-25
BRPI0701803A (en) 2008-03-04
CA2581427C (en) 2011-06-21
US8662121B2 (en) 2014-03-04
US8069888B2 (en) 2011-12-06
CA2736343A1 (en) 2007-09-30
US20110120593A1 (en) 2011-05-26
US20070234860A1 (en) 2007-10-11

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