Reject devices ensure that product quality and safety are
Where a product does not meet quality or safety standards, reject devices ensure that they are removed from the production line and prevented from reaching a customer. The type of reject device used depends on factors such as pack size, weight, and shape, as well as the line pitch, speed and belt width of a conveyor. Where possible, reject devices should be automatic to assure accuracy, safety, and compliance with programs such as FSMA, SQF, GFS, and BRC.
AIR BLAST REJECT
Located on the conveyor opposite the reject area, the Air Blast reject device is a nozzle that will release a sudden burst of air to blow a product off the conveyor belt and into a reject bin. The Air Blast reject is most effective with fast-moving packaged products weighing less than two pounds, such as light packs of biscuits or chocolate bars.
BELT STOP ALARM REJECT
Suitable for any product where automatic reject is not necessary, but generally used for heavy products that run at low rates up to55 lbs. A Belt Stop Alarm reject will stop the conveyor belt upon metal detection and sound an alarm so that the operator is audibly notified of product rejection. The operator can then safely remove the product from the conveyor belt for inspection with an offline metal detector.
Upon detection, the Diverter reject device actuates a paddle to redirect product flow diagonally across the belt and into a locked reject bin. The paddle then pivots across the belt for the following products to continue to be conveyed down the production line. It is best suited for medium to light packaged products with low pack weights of less than 15 lbs.
As a product moves over the Dropnose section of the conveyor, the belt will pivot downwards, and products will drop down into a reject bin or onto another conveyor. The pivoting section will then rise back up to resume the transfer of products along the production line. The Dropnose reject is ideal for products such as large 50-100 lb bags that run at lower speeds.
FLAP GATE REJECT
The Flap Gate reject uses a flap that, upon detection, pivots outward, directing products with the back side of the flap into the reject area located under the outfeed end of the conveyor. With the flap in its normal position, the product flows off the top side of the flap and onto the downstream equipment. This reject device is best suited to bulk flow unpackaged or loose lightweight products.
Best suited for medium to large products such as bulk bags or boxes, the Kicker reject uses a paddle on a linear actuator to push the defected product off the conveyor belt. This reject option is ideal for packaged products under 30 lbs., such as bags of pet food or flour. Heavy duty options are available for heavier products that run at relatively low rates.
HEAVY-DUTY KICKER REJECT
A step up from the Kicker reject device, the Heavy-Duty Kicker is robust and designed to push large, heavy products such as large bags off the conveyor belt. Upon rejection, a transverse paddle on a guided actuator arrangement is activated to remove products over 30 lbs. from production.
Bi-DIRECTIONAL SWEEP REJECT
The Bi-directional Sweeper reject uses a paddle positioned over the width of the conveyor to sweep rejected products across the belt. The paddles remain in position till the next rejected product arrives, where it will sweep across the belt in the opposite direction and reside there.
OVERHEAD SWEEP REJECT
The Overhead Sweep reject uses a paddle located above the products conveyed through the production line. Upon rejection, the paddle sweeps across the width of the belt to eject products into a reject area or bin. Upon removing the product from the line, the paddle immediately returns to its home position. The Overhead Sweep reject is a suitable option where a standard kicker may be cumbersome due to the reject cylinder protruding from the system. It is effective to use with Discreet products up to 30 lbs.
RETRACTING BELT REJECT
Upon detection of a defective product, the exit roller will retract, exposing a void where the product will fall into a reject area or bin. This reject type is relatively gentle and limits potential product trapping when correctly set up. This type of reject is ideal for a wide range of product types, whether packaged, unpackaged, discrete or bulk flow.
Effective for bulk flow product applications, the Reversing reject comprises an inspection belt that waterfalls the product onto the reject belt. Upon rejection, the belt will reverse direction for a suitable time to reject all products into a reject area usually located under the outfeed of the inspection belt. This reject can be implemented with a switch to reverse automatically during product testing and handle most bulk flow applications.
Where end users would like to handle the rejection themselves, the inspection system will not have a reject device. Upon detection, the system will signal the end user to alert them of the event.
The Liftnose reject is best used with discreet products relatively low in height. Upon detection, a pivoting on the out-feed shaft conveyor raises the in-feed end of the conveyor belt and exposes a reject area underneath the reject conveyor. Product waterfalls from the feeding conveyor directly into the reject area as the lift-nose conveyor returns to its home position before the next good pack approaches.