Since 1922

What’s New at NC STATE Wood Products Extension 

Wood Products Extension 2019 Workshops

Lumber Drying and Lumber Grading Workshops to be Conducted at NC State University

The drying of hardwood lumber requires a science based approach to produce a quality product.  This 3-1/2 day short course will teach the student how to dry lumber without degrade.  The course includes both classroom instruction and hands-on lab instruction by Extension personnel and industry personnel.  For more details about the 2019 Dry Kiln Operator’s Short Course:  http://go.ncsu.edu/drykilncourse    (The link has been fixed !)

Hardwood lumber grades establish the value of the lumber and determines product suitability.  The NHLA lumber grade rules provide industry standards that are applied to hardwood lumber to insure consistent grade quality.  This three-day workshop will cover the fundamentals of hardwood lumber inspection and give attendees the opportunity for hands-on application of the rules.  For more details about the 2019 NHLA Hardwood Lumber Grading Workshop (conducted at NC State University):  http://go.ncsu.edu/hardwoodlumbergrading

 

We Need Your Input!

Wood Waste Reclaim and Recycle: 
A Survey for the Wood Products Industry

Wood Products Extension at NCSU is currently developing a Wood Waste Recycle & Reuse program. To assess the needs of the wood products industry we would like to ask you some questions. All responses remain anonymous and confidential.  CLICK HERE for the survey.

 

Hold the Date ! 

Southeast Dry Kiln Club Spring Meeting
Dr. Gene Wengert will give the Technical Session

WHEN:  June 13 – 14, 2019
WHERE: Marion, NC area (specifics and tours TBD)
More meeting details will be forthcoming in SEDKC Newsletter.
Technical Session Topics given by Dr. Wengert:
Review of best techniques for
* Drying white and red oak

* Drying hard maple and other white woods

* Getting more uniform final MC

* Shortening kiln residence time

 

WOOD 101 Short Course at NCSU Announced

WOOD 101 is a one day workshop designed for participants to learn about and explore numerous facets of wood and forest products.  This course is designed for those that want to know more about wood : woodworkers, hobbyiests, homeowners, DIY wood folks, consumers, and those that simply want to know more about this versatile material. Come join us in NCSU’s Hodges Wood Products Laboratory on Thursday June 20, 2019. (Pre-registration required). For registration details CLICK HERE.

 

List of 2019 NCSU Wood Products Extension Workshops 

The 50th Annual Dry Kiln Operator’s Short Course, Raleigh, NC, May 14 – 17, 2019.  (contact Phil Mitchell: Phil_Mitchell@ncsu.edu)
Registration and more details:   http://go.ncsu.edu/drykilncourse

NHLA Hardwood Lumber Grading Workshop at NC State University, Raleigh, NC,  June 4- 6, 2019.  (contact Phil Mitchell: Phil_Mitchell@ncsu.edu).
Registration and for more details:  http://go.ncsu.edu/hardwoodlumbergrading

National Firewood Workshop, Epsom, NH, June 12 and 13, 2019. Contact Harry Watt for information (704) 880-3067 or Harry_Watt@ncsu.edu   CLICK HERE for registration and more information.

Wood 101, June 20, 2019. Contact Frederik Laleicke (Frederik.Laleicke@ncsu.edu) for more information .  CLICK HERE for registration and more information.

Upholstery Frame Design and Manufacturing Workshop, Conover, NC, planned for second Thursday in November. Contact Harry Watt for information (704) 880-3067 or Harry_Watt@ncsu.edu

Alternative Forestry Income Streams for Landowners, Thursday, July 11, 2019, Mills River, NC. Click here for more information.

Alternative Forestry Income Streams for Landowners,Tuesday, June 4, 2019, Statesville, NC. Click here for more information.

 

Four Excel Spreadsheets that help explain the Behavior of Wood.

Estimating the Air-Drying Time for Lumber Using the Air-Drying Estimator Spreadsheet

Lumber is often air-dried for months prior to being kiln dried.  The air-drying yard manager must decide when to stop air-drying and move the lumber to the dry kiln.  The Air-Drying Estimator Excel spreadsheet is based on previous air-drying of lumber research. The intent of the Air-Drying Estimator is to help the air-drying yard manager estimate how long to air-dry lumber prior to kiln drying based on species group, U.S. location, the start date, initial moisture content, and the target or ending moisture content.  The Air-Drying Estimator will estimate the date the lumber dries to the target moisture content, the number of air-drying days required for the base case and for lumber placed on the yard each month, and displays drying curves.

Download the “Air-Drying Estimator.xls” spreadsheet (or email phil_mitchell@ncsu.edu to get the xlsx version).

Download the Wood Products Note Article “Using the Air-Drying Estimator to Predict the Air-Drying Time for Lumber.”

 

Calculating the Equilibrium Moisture Content

The moisture content of wood in an environment held at the constant conditions of temperature and relative humidity will come to an equilibrium with its surroundings.  The air temperature and relative humidity will determine the equilibrium moisture content (EMC) conditions, and the moisture content of wood in that environment will approach the EMC of the air.  An Excel spreadsheet (titled “EMC Calculate”) is available that will calculate an estimate of the EMC based on the dry-bulb temperature and one of the following: relative humidity; wet-bulb temperature; or, dew-point temperature.

Download the EMC Calculate.xls spreadsheet (or email phil_mitchell to get the xlsx version).

Download the Wood Products Notes article “Calculating the Equilibrium Moisture Content for Wood Based on Humidity Measurements.”

 

The Equilibrium Moisture Content of Wood in Exterior Locations in the United States: An Update

Wood responds to atmospheric moisture in a predictable manner.  If the relative humidity and temperature of the air are known, we can determine the equilibrium moisture content of that air, or EMC.  Knowledge of the EMC is useful in estimating how fast lumber on an air drying yard will dry; how long it will take for kiln dried lumber to pick up moisture when stored in a warehouse; and the performance of finished wood products in exterior service.  The National Oceanic and Atmospheric Administration publishes 30-year Climate Normals for locations in the United States.  Climate Normals for 1981-2010 were used to determine the average monthly exterior EMC values for 252 locations in the US.

Download “EMC’s in the US locations.xlsx”

Download the Wood Products Notes article  “The Equilibrium Moisture Content of Wood in Exterior Locations in the US: An Update.”

 

Differential Shrinkage and the Cupping of Lumber: an Excel Spreadsheet

Wood shrinkage is often calculated with the assumption that the radial and tangential shrinkage occurs parallel to the lumber surfaces. As a result, the calculated shrinkage has a built-in error in calculating the change in dimension as it ignores the curvilinear nature of the growth rings. This Excel spreadsheet model considers the curvilinear nature of growth rings to calculate the transverse wood shrinkage and the amount of cup that might develop. The model is dependent on wood species, initial and final moisture contents, and location of the board within the log.
Download the Differential Shrinkage Model (Excel spreadsheet)

Instructions on Using the Differential Shrinkage Model

TOOLS & RESOURCES
Hardwood Wizard
A powerful search engine created specifically for the hardwood industry . . .READ MORE
Hardwood Wizard
A powerful search engine created specifically for the hardwood industry . . .READ MORE
Hardwood Wizard
A powerful search engine created specifically for the hardwood industry . . .READ MORE
Hardwood Wizard
A powerful search engine created specifically for the hardwood industry . . .READ MORE
TOOLS & RESOURCES

A powerful search engine created specifically for the hardwood industry . . .

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Tracking price movement over a historical landscape can reveal valuable information . . .

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HMR presentations offer a different and often much broader examination . . .

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Information used to produce HMR publications comes from a broad range . . .

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