HomeAboutStudentsFaculty and StaffContactDirections

Strand Composites Pilot Line

In 2004, the Center completed an expansion which significantly increased its wood composites manufacturing capacity with the addition of a complete Strand Composites Pilot Line capable of producing OSB, OSL, and LSL. Companies may contract for complete manufacturing, from debarked log to pressed board to tested specimen, or they may choose only certain unit operations, such as stranding and drying. 

 
Log Delivery

 Companies may deliver either tree length logs or logs pre-cut logs (optimally 5' in length), preferably debarked.

 bucking_logs.jpg

logs_2.jpg

log_delivery_2.jpg

 

 
Log Tank

log_tank.jpgloading_log_tank.jpg

 

 

 

 

 

 

Log Conditioning Tank - Approximately ten 5' long, 12" diameter logs, can be soaked and/or heated in our log tank at a time.  The water can be heated up to 140 Fº.

 

 

 
Carmanah 12/48 Laboratory Strander

carmanah_strander.jpgCarmanah 12/48 Laboratory Strander - Capable of converting up to 12" diameter logs into strands from 3-12" in length for laboratory-scale OSB/OSL/LSL production.  A 48" inside diameter ring holds two knives which protrude into the inner face of the ring (both plate and disposable knives are available).  Flakes are produced by advancing the log through the rotating ring at a specified rate.  Projection of the knives in combination with ring speed determine the flake thickness, while the flake length is determined by the scoring knife spacing.  Desired flake width is achieved by selection of the appropriate counterknife angle (from 45 to 85 degrees in 5 degree intervals).

                       Carmanah Lab Strander Specifications

 Maximum log size  12" diameter x 72" length, cut in four 12" passes
 Flake lengths  From 3" to 12" (3,4,6,12 standard)
 Flake thicknesses  From 0.010 - 0.050 (dependent on species, log temp and MC
 Maximum production  550 OD lb/hr (Aspen)
 Ring speed  Range: 350 - 1000 rpm (638 rpm simulates production version)
 Ring ID  48"
 Knife angle  33 degrees
 Counter knife angles  Available in 45,50,55,60,65 and 70 degrees (75 degrees, 75 degrees with setback

 

 

 

 
Acrowood Trillium Strand Screener

acrowood trillium screener

 conveying_to_screener.jpgscreen_outfeed.jpg

 

Acrowood Trillium Strand Screener - Acrowood TrilliumTM  as

well as Diamond Roll OSB/OSL Strand Screeners, capable

of separating strands into three size fractions.  The Trillium

screen has 18 shafts, each rigged with a multitude of

triangular shaped disks.  The shafts are divided into two

zones, each controlled by a variable frequency drive. 

The triangulardisk shape produces significantly higher

strand agitation through the screen as compared to

traditional circular disks, which increases the

screen's capability to separate fines from both dry

and green strands. While the Trillium screen works

well on dry strands, severalmanufacturers have

expressed the interest in green screening,

which removes the fines from the strand stream

prior to drying,thereby increasing overall efficiency. 

Larger strands pass over theTrillium screen, with

the remainder falling through into the Diamond

Roll Screen.  This material, in turn, is separated

into intermediateand fine size fractions.  A Gilson

screen is available to determinescreening efficiency

of the Trillium and Diamond Roll in removing

fines from the strand stream at various loading

rates and settings.Screen mesh sizes range

from #60 to 1 1/2".

 

 

                       Screening Specifications

 Conveyor Size  21' long, 2' wide, 9" high side rails
 Conveyor Speed  VFD controlled, 1 - 110 fpm
 Conveyor feed rate  Approximately 0 - 12,000 green pounds/hr
 Trillium shafts  18 shafts, two zones of 9, 3 mm IFO
 Diamond Roll  Variable speed, variable IRO

 

 

 

 
Koch OSB In-Line Conveyor Lab Dryer

osb dryer infeed Koch OSB In-Line Conveyor Lab Dryer - The dryer is 10' long and 3' wide, with an additional 4' of infeed and outfeed.  The dryer can evaporate up to 250 lbs of water per hour, at a maximum temperature of 325 Fº and a fan speed of 7,500 cfm.

   

loaded_kiln_1_2.jpg

Nyle Dehumidification Dry Kiln - Six drying racks are available for strand drying, each capable of holding 100 lbs of (aspen) strands, giving an effective daily rate of 600 lbs of green strands.

 

 
Coil Spinning Disk Atomizing Resin Blenders

blender.jpgCoil Spinning Disk Atomizing Resin Blender - The Center has two Coil resin blenders: a 3'x6' with a capacity of 30 lbs/batch and a 5'x10' with a capacity of 120 lbs. The drums can be rotated at 20 rpm, and the spinning disk atomizer to 15,000 rpm.  The resins (normally PMDI or PF) and additives (such as waxes and preservatives) are sent to the blender's spinning disk by means of a peristaltic pump.

 
Forming Line

A custom built forming line is available to form oriented OSB/OSL/LSL mats, 52" wide x 100" long and up to ~16" high, ready for pressing. Picker rolls within the forming bin send a uniform flow of strand to the orienting deck, which contains toothed disks on shafts, both of which are adjustable for different strand lengths. The line contains a built-in image analysis strand measurement device which can quickly determine strand geometry and alignment. Hand forming of smaller panels within deckle boxes can also be performed.

 

forming_line_1a.jpgforming_line_3a.jpgstrand_alignment.jpg    

 

 

 

 

 

 

 

 

 

formed_mat.jpg

trimmed_mat.jpg

trimming_mat.jpg

 

 

 

 

 

 

 

 

 

 

forming_line_2a.jpgpressed_boards.jpg

 

 

 

 

 
Strand Composites Pilot Line Presses
  erie_press.jpg mat_entering_press.jpg
4' x 8' Erie Mill & Press, 1800 ton Hydraulic Hot Press  - PLC controlled, with complete data collection of all variables at 1
second intervals and graphing of any four variables vs. time (e.g. position, pressure, core temperature, internal vapor pressure).
The press can be controlled in either position (to within 0.003")
or pressure (to within 2 psi) control. Maximum pressure on a full
4'x8' mat is 725 psi.  Energy is provided either by hot oil
(up to 500 Fº) heated platens or Thermex-Thermatron radio frequency (10 KV, 30 KW system). 
press1.jpg
  press_2.jpg

34"x34" Dieffenbacher steam injection press. This press system, acquired in 2009, is controlled by ARC's PressMan system. Composite mats can be pressed either with or without steam injection (up to 250 psig steam pressure). Steam injection allows for the pressing of relatively thick strand composites, such as 3.5" thick LSL.

 

 

 

 

 

 

 

 

 

 

 
Board Conditioning

Boards/panels can be conditioned prior to testing in one of our two environmental chambers.  Most wood composites are placed in the chamber set at 70 Fº and 65% RH (which for most species, gives an approximate EMC of 12%).

condchamber.jpg

 

 

 

 

 

 

conditioning_specimens.jpg 

 
Testing

 

The Center is ISO 17025 accredited to conduct many wood composite tests, including D1037-Standard Test

Method for Evaluating Properties of Wood-Base Fiber

and Particle Panel Materials and D5456- Standard

Specification for Evaluation of Structural Composite

Lumber Products 

  flexural_testing.jpg  

   

 

 

 

 

nail_withdrawal.jpg

 

 

 

 

 

 

nail_testing.jpg

 

 

 

 

 

 

wats_specimens.jpg

 

 

 

 

 

 

internal_bond.jpg

 

 

 

 

 

 

testing.jpg

 
UMaine 
Logo
An ISO 17025 Accredited Laboratory
(207) 581-2123
composites@umit.maine.edu