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WRWA-200 sequence of operations

Generic Sequence of Operation

  1. Product is manually placed on the infeed conveyor and then the start button is pressed.
  2. Load moves up to the end of the infeed conveyor photoeye and stops if the machine is still wrapping a product, otherwise the load moves through the ring until it reaches a second photoeye.
  3. The overwrap at the front of the load is determined by the value selected via the operator interface.
  4. Then the ring starts its acceleration until it reaches its maximum speed.
  5. When the selected number of front wraps is achieved (selected on the operator interface) the load starts moving forward.
  6. The overlap on the load depends on the conveyor & ring speed, which means that if the conveyor speed needs to be X because of existing conveyors, Wulftec will have to provide a dual speed infeed conveyor - so that the speed of the conveyor can be changed to accommodate the overlap required. This value is adjustable from the operator interface from 4'' up to 16'', depending on machine configuration.
  7. The load advances until it clears the center photoeye. The overwrap is adjusted via the operator interface, which determines the length of film required to overwrap the load.
  8. Then the selected number of end wraps (selected on the operator interface) is achieved.
  9. Before the last revolution, the clamp opens to catch the film and closes to hold it in place.
  10. The film is then cut by a blade cutter system and push under the load via air blower.
  11. Then the load moves forward. When the outfeed photoeye is clear, the load waiting on the infeed conveyor will start moving forward.
    1. If there is a top hold down at the infeed, the holder will come down while the conveyor brings the load forward, which means that no cycle time is lost.
    2. If there is a top hold down on the outfeed, the holder will come down when the outfeed photoeye is blocked, which again does not affect the cycle time.
    3. If there are side guides, the motion starts when the load is stopped on the infeed conveyor, to ensure that the load is centered before entering the wrap zone

Possible Sequences


Communication Signal

If the customer has existing conveyors at the entrance and exit, the standard communication signals present on the machine are used.

  • Wulftec ready to receive (Infeed)
  • Customer ready to send (Infeed)
  • Wulftec ready to send (Outfeed)
  • Customer ready to receive (Outfeed)

(The speed of the customer's conveyor will have to be matched by our machine. A dual conveyor speed may be required depending on performance requirements.)


Banding Option *

A: Banding only ON,
The machine applies the number of front wrap selected on the operator interface and then clamps and cuts the film. It does the same at the end of the load - resulting in only both extremities having bands.
B: Banding only OFF,
The machine applies the number of front wraps selected on the operator interface and then wraps the load all the way to the end and performs the end wraps to finally clamp & cut the film.

Mid-Band Option *

A: Mid-Band ON
Depending if the banding only has been selected ON or OFF, the mid-band may have a cut sequence between the band. The mid-band ON, adjusts the band to be every X” and with X amount of revolutions selectable on the operator interface. The front and end wraps are still performed in this mode.

Loads Per Hour Display

Allows the operator to see how long it takes for the machine to perform one cycle. This allows the operator to anticipate workload and analyze the performance of the system.


Cycle Counter

This re-settable cycle counter will allow the operator to determine how many loads are being wrapped in a certain period of time.

 

* Optional

 

 

Best Warranty
  • 3-year unlimited cycle warranty
  • 10-year warranty on structural frame
  • Lifetime warranty on the Wulftec's blue pre-stretch compound rollers