Bag Rejector
Behpoo bag rejectors remove faulty bags from the conveyor without stopping the line. Five reject mechanisms are available, matched to bag weight up to 50 kg and to your line speed.
A bag rejector takes the reject signal from a check weigher or metal detector and physically removes the identified bag from the line. It is the actuator that turns inspection into action.
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The mechanism is chosen by bag weight, line speed and available space. A 50 kg sack moving at speed carries momentum that a light-duty pusher cannot handle; a fast line leaves too little time for a slow diverter. Behpoo specifies the mechanism, the actuator force and the timing logic together.
Timing is where most reject systems fail in practice. The reject command arrives while the bag is still travelling, so the system must track bag position from the inspection point to the reject point — through an encoder or a tracking shift register. If tracking drifts, the wrong bag gets rejected and two bags are lost instead of one.
Rejected bags go to a lockable collection area so they cannot re-enter the line without a decision.
Benefits & Features
- Bag weights up to 50 kg
- Five reject mechanisms for different weight and speed combinations
- Encoder-based bag tracking from inspection point to reject point
- Reject confirmation sensor — the system verifies the bag actually left the line
- Lockable reject collection area
- Reject counting and reason logging
- Interlocked with check weigher and metal detector
Product Range
| Type | What it is | Typical use |
|---|---|---|
| Pneumatic Pusher | Cylinder pushes the bag sideways off the belt | Standard sacks at moderate line speed |
| Diverter Belt | A belt section swings to send the bag to a second outfeed | High throughput, where the bag must stay upright |
| Drop Flap | A hinged section of the conveyor opens and the bag falls through | Heavy bags where sideways force is impractical |
| Retracting Belt | The belt end retracts and the bag drops into a bin | Compact installations with limited side space |
| Air Blast | Compressed air jet removes light packs | Light packs and small bags only |
Available Options
| Option | Choices |
|---|---|
| Actuation | Pneumatic · Electric |
| Bag tracking | Encoder · Photocell shift register |
| Reject confirmation | Photocell · Weight verification |
| Collection | Open bin · Lockable enclosure |
| Frame material | Painted carbon steel · SS304 · SS316 |
| Safety | Standard · ATEX |
Technical Specification
| Parameter | Unit | Range |
|---|---|---|
| Bag weight | kg | 5 – 50 |
| Line speed | m/min | 10 – 60 |
| Reject rate capability | bags/min | up to 40 |
| Actuator force | N | 300 – 1,500 |
| Compressed air pressure | barg | 6 – 7 |
| Compressed air consumption | Nl/cycle | 2 – 8 |
| Frame material | — | Carbon steel · SS304 · SS316 |
| Installed power | kW | 0.37 – 1.5 |
| Hazardous area | Zone | 20 / 21 / 22 on request |
Areas & Application
Cement & Building Materials
Removal of underweight and torn sacks before palletising, protecting the pallet pattern and the customer relationship.
Fertilizer & Agriculture
Automatic removal of out-of-tolerance sacks on high-throughput lines running unattended.
Polymers & Chemicals
Rejection following metal detection, in ATEX execution where required.
Food & Feed
Removal of packs failing weight or contamination checks, into a lockable bin for audit traceability.
Options & Compliance
- MaterialsPainted carbon steel · SS304 · SS316
- Hazardous areaATEX execution for Zone 20 / 21 / 22
- EnclosureIP55 standard · IP65 washdown
- Control interfaceProfinet · Modbus TCP · EtherNet/IP, interlocked with upstream inspection equipment
- StandardsISO 12100 risk assessment · EN 60204-1 · retailer audit requirements for lockable reject collection
Tell us your bag weight, line speed and available space — we will select the reject mechanism and timing logic.