The Cedar Leader 


Greetings!

Please save the date to attend the annual Cedar Summit hosted by the Aromatic Cedar Association.   Topics for the Summit will include Innovations in Harvesting, Woody Biomass Storage, and Conversion Alternatives.    

  

Saturday October 12, 2013                                                8:00-9:00 Registration 

Enid Convention Hall                                                        9:00-12:00 Opening Session 

301 S. Independence                                                        12:00-1:00 Lunch 

Enid, OK 73701                                                                  1:00-2:00 Closing Session 

  

 

 

Luncheon Speaker:  

Secretary Jim Reese

Oklahoma Dept. of Agriculture, Food and Forestry 

 



Cost to attend is $25 for Aromatic Cedar Association Members, and $30 for Non-Members. Lunch is included.  

 

To Register:  Call Debbie Hand at (580) 233-4232 or email: [email protected]. 

 LET'S TALK

Dr. Craig McKinley

ACA Board President

 

During most of our careers, either someone said to us or we said to one of our employees, "We need to talk." Many times the conversation addressed an idea for management or product improvement or it focused on a specific issue that needed to be solved.  At other times, the discussion was what we might call a "do better" talk.  In this case, a supervisor suggests to the employee the need to improve some aspect of job performance.  Although not exactly the most exciting moments in a worker's life, a "do better" talk is often necessary simply to restate organizational ground rules, to remind the employee what is expected, and to indicate where improvement is required.    

 

As the primary organization in the private sector, the Aromatic Cedar Association serves as the focal point for a great number of activities. These activities include educational and promotional efforts directed toward harvesting, transporting, processing, and marketing of redcedar products. As we look over the last few years, it is apparent that the Aromatic Cedar Association has been successful in many of its efforts.  Conversely, the success has not been as great as we would have liked. Officers, Board Members, and many of the general membership of the Association have spent countless hours promoting the redcedar resource and its potential in the state of Oklahoma. It is now time for some of us newer officers and members to become actively involved in the promotion of redcedar to a greater extent. Without the dedicated, active participation at all levels within the Association, the educational and developmental efforts will never meet the goals that have been set forth.  In 2008, a planning session was held in Stillwater.  The outcome of that session was a vision for the redcedar industry in the state of Oklahoma. Interestingly enough, that vision looked forward to the year 2013, and where we would like to be at that particular time. Well, 2013 has arrived. We have met some of the goals but we haven't met all of them.  Briefly stated, we're going to have to work harder and smarter if we're going to meet the objectives set out several years ago.

 

Part of that 2008 vision statement stated that by 2013 "Manufacturing cedar products has become one of the top 10 industries in Oklahoma."  As we look around today we can see a number of existing industries or operations potentially coming to the state that would utilize the redcedar. We currently have a very successful mulch operations and there are several entities looking at pellet production, methanol/ethanol production, charcoal facilities, etc. However, redcedar is far from being a top 10 industry.

 

Given our stated goals and the resource at hand, we all know the potential for economic growth and benefit is right here, right now.  We also know that if the redcedar resource is going to be utilized to its fullest extent, a great deal of effort and dedication to that goal is required.  In short, we all need to "do better".


Figure 1

Eastern redcedar sample exposed to a temperature of 340 degrees for 7 hours.

 

Figure 2
Eastern redcedar control sample.

Figures 1 and 2 also illustrate micrographs taken from the cross section of heat treated and control samples, respectively. It is clear that exposure of the samples to high temperature resulted in in certain damage in the form of broken parts as can be seen  Figure 1. However cellwall of the tracheids were compete and undamaged in the case of control  samples (Figure 2). Such findings determined in micrographs taken from the surface of heat treated samples are also supported by having lower hardness values of heat treated samples.


Properties of Heat-Treated 
Eastern Redcedar

Provided by Dr. Salim Hiziroglu

 

Heat treatment is one of the processes to modify properties of wood and wood products. Generally heat treatment does not require the addition of any chemicals into the wood to change its characteristics. Heat treatment of wood has attracted substantial interest in North America having raw material with improved properties for different applications including flooring, siding, kitchen cabinets and windows. The main idea of heat treatment is to enhance dimensional stability and change the color of the final product so it can be used more effectively during service life.

 

In a typical process wood is exposed to temperatures ranging from 330 to 550 degrees Fahrenheit depending on the species and the desired target properties. Heat treatment technology has been developed in Europe within the last 20 years. It is a well known fact that heat treatment improves the physical properties such as equilibrium moisture content, shrinking and swelling of wood. However, mechanical properties of wood are adversely influenced as a result of the heat treatment process. Although different properties of Eastern redcedar have been investigated in previous studies, there is very limited information on behavior of this species as a function of heat treatment.  

 

In this work, 1-1/2 inch thick boards of Eastern redcedar were supplied by a local sawmill in Oklahoma. Each board were planned and cut into 1 x 1  x 2 inch small specimens. Defect free samples with tangential grain orientation were conditioned in a room with a temperature of 70 degrees Fahrenheit and a relative humidity of 65% until they reach to an equilibrium moisture content of 12%. Heat treatment was carried out at two temperature levels of 290 degrees Fahrenheit, and 340 degrees Fahrenheit for 3 and 7 hours in a laboratory type oven.   

Polyvinyl acetate (PVAc) adhesive was used to bond samples in the form of a pair to determine their shear strength. Adhesives were applied to both surfaces of each shear pair at a spread rate of 20 g/ft squared. The samples were then cold pressed using an approximately pressure of 10 psi for 2 minutes at room temperature before shear tests were carried out. Hardness of the control and treated specimens was also determined by embedding a hemisphere steel having 0.44 inches in diameter onto their tangential surface to the grain

directions using Comten 95 Series Universal testing machine to evaluate their Janka hardness.
The results of some physical and mechanical properties of the samples exposed to heat treatment are displayed below. 

 

 

Heat Treatment

Heating

Time

Oven-dry Density

Weight Loss

 

Shear strength

Janka hardness

Density

(g/cm3)

WL

(%)

MPa

kN

Control

 

0.482

 (0.028)

 

 

 

 

6.04

 (1.06)

 

3.89

 (0.60)

 

290 F

  3 hr.

0.476

 (0.034)

 

 8.62

4.78

b

(1.25)

 

3.81

b

(0.46)

 

  7 hr.

0.471

 (0.033)

 

 

 9.52

4.65

 (1.24)

 

3.75

 (0.54)

 

340 F

  3 hr.

0.461

 (0.038)

 

 9.99

4.51

 (1.17)

 

3.70

 (0.53)

 

  7 hr.

0.300

 (0.017)

 

 10.36

4.15

 (1.08)

 

3.40

 (0.68)

 

*Values in parentheses are standard deviation.

           

 

 
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