CTC
Automated Veneer Sorting Line

Machine ID: 007238

Year Mfr:

Condition: Good Condition

Location: North Carolina

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Contact: Ralph Viegelmann
704-288-1904 Ext: 101
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This is a late model line that is no longer needed at the current location.  System is under power and available for inspection.
Manufacturer specs (to be confirmed):
UNSTACKER OVERVIEW
Infeed System - The infeed rollcases receive unbanded, unstickered, stacks of veneer via a forklift. The veneer stacks advance automatically onto the unstacker scissor lifts as needed. Load present switches indicate when loads are available to advance onto the unstacker lift rolltops.
Scissor Lifts - There are two lifts with powered rolltops present in this double unstacker. The lifts will adjust up automatically to insure proper position of the top of the veneer stack. When all the veneer has been unstacked, transferred and the lift is empty, the lift will move to its collapsed position. The lift is now ready to accept another stack of veneer from the infeed system.

Take-Off Belt Transfer - This section is made up of two belts with vacuum holes, vacuum plenum, flex duct, suction duct, and a suction fan. This transfer actuates up and down by a hydraulic cylinder.  The correct operation of this transfer is the key to successful unstacking. When a stack of veneer is present on the scissor lift and the lift has come up to the proper unstack level, the take-off transfer will lower onto the stack of veneer. The take-off transfer will then return to the up position, taking with it one sheet of veneer. The take-off belts will then start and transfer the sheet downstream, transferring the sheet onto the staging beltway. The take-off belts will stop and the cycle is repeated.
 
GRADING ZONE OVERVIEW
Staging Beltway - The four staging belt transfer sections convey the unstacked sheets of veneer away from the take-off transfer. These transfers are also the queue area for holding and placing the sheets of veneer from bin #1 and bin #2 in the proper sequence onto the grading beltway as dictated by the recipe management program. This system helps keep the transfer/grade area into the stacker full at all times and has the ability to place sheets in the proper sequence as required by the various sorting recipes.
 
Grade Beltway - The grading area consists of a grade beltway, Metriguard moisture meter, and reject tipple. The grade beltway transfers the sheets through an operator grade area and a PreTec grade scanner. The operator controls thereject tipple via the operator’s console or a moisture meter output. Thereject tipple rejects sheets into a reject cart. Sheets are then transferred unto the stacker infeed beltway and into the stacker plenum.
 
STACKER OVERVIEW
The variable speed stacker is designed to transport the veneer from the infeed belt to the bin assemblies at up to 50 pieces per minute (375 fpm at 60 Hz). En route to the desired bin, a number of things are being done to the sheet.  Knock-off Prox - Each bin is associated with two proxes that are mounted up inside the stacker transport belts. There is one eye on each side of the machine, just inside the bin hoist. The function of these eyes is to detect the sheet once the system has determined the sheet is destined for that bin. Once the system has turned on the knock-off enable, the proxes will trigger the bin knock-offs once one eye is blocked. The knock-off enable is indicated by the amber lamp mounted on both sides of the machine above each bin.
 
Stack Height Photo Eyes - These are through-beam photo eyes that look across the top of the stack to automatically adjust the level of the bin hoist as veneer is placed into the bin. It is normal for the bin hoist to occasionally seek this by raising the hoist up until the beam is broken, and then lowering again until clear. The stack height position relative to the stacker transport belts is critical for proper veneer sheet placement within the stack.
 
Fans - The fans are responsible for the vacuum necessary for transporting the veneer down the length of the stacker. There is one fan located above every bin in the system. All fans must be running before allowing veneer to enter the system.
 
Knock-off System - This system is the reason for the success of the CTC veneer stacker.  The knock-off system is made up of four air valves with flow controls, four air cylinders and two knock-off shoes for each bin area.  When the sheet reaches the designated bin the four air cylinders are programmed to fire individually, thus allowing straightening of skewed sheets as they are stacked. The knock off shoes and cylinder transfer the sheet from the transport belts to its bin. There is one knock-off shoe for each pair of slave cylinders. The knock-off shoe is attached to the slave cylinder with aluminum clevises.
 
Operator Interface (Touch Screen) - The touch screen interface and operator’s console is located at the grading area at the infeed of the stacker. This system is located in an operator’s console enclosure that also houses the touch screen. The function of this interface is to set system parameters, alarm functions, troubleshoot, diagnostics and shift report. Also located on this console are the pushbuttons for power on/off, line interrupt, E-Stop, hydraulics, fans, etc.
 
Plenums - The plenums are the main vacuum chambers that run the full length ofthe stacker. These chambers have a unique patented feature, the “fan zone baffling.” Baffling does not let the vacuum from one bin affectthe vacuum of an adjoining bin. This is the reason for a single fan for each bin zone. The bottom of the plenum has a series of holes that have been carefully engineered and cut into the plate for optimum lift of the veneer. The belting is also a carefully designed belt that is key to performance of the system.
 
Grade Console - The grade console is located in the operator’s console along with theoperator interface screen. This console houses the grade selection pushbuttons. The operator may select a grade of a given sheet so that the sheet can be transferred and stacked in its proper grade bin.
 
STACKER OUTFEED OVERVIEW
The outfeed section transfers the full stacks from the exiting point of the bin to the outfeed rollcase area where the stack will be picked up by a forklift.
Bin Clear Limit Switch - Associated with each bin is a limit switch that detects a stack being transferred from the bin to the outfeed. The function of this switch is to transfer the grade from the bin memory to the appropriate outfeed zone. This happens when the limit switch is energized and then released by the load while the stack is being transferred out. Once the limit switch is clear, this allows the bin hoist unload cycle to proceed.
Outfeed Deck Clear Limit Switch - If a stack is present on the outfeed when a bin is attempting to unload, the unload cycle waits until the zone is clear before unloading.

Manufacturer CTC
Model Automated Veneer Sorting Line
Year
Machine Location North Carolina