Application
Bulk Bag Discharge in Pet Food Plants
Answer in brief
In pet food plants bulk bags carry the premixes, and the premixes are the ingredients with the smallest inclusion and the biggest consequence.
A bridging bag that empties unevenly shows up as an out-of-specification batch rather than as a flow problem.
- Empty the bag completely and verify it.
- Sieve before the mixer.
- Keep medicated and standard premixes physically separated.
Reviewed October 21, 2026 · Updated October 21, 2026
The problem
Fine mineral and vitamin premixes bridge and leave residue in the bag, which changes the inclusion rate without anyone noticing.
Desired outcome
A station that empties the bag completely, releases no dust at the connection and delivers a stable flow to whatever is below it.
Process approach
Massaging and a sealed spout connection give a complete, controlled discharge, and weighing below the station confirms the quantity actually delivered.
A sieve before the mixer removes agglomerates and foreign material from the bag.
Segregation between medicated and standard premixes is handled by dedicated equipment or by a documented and verified cleaning step.
- Massaging for cohesive premixes and verified complete discharge.
- Weighing below the station.
- Segregation plan for medicated ingredients.
Selection factors
- Inclusion rate of the premix and the accuracy required.
- Flow behavior of the finest mineral component.
- Segregation requirements for medicated feed.
- Dust exposure at the station.
- Part-bag handling between batches.
Common failure modes
- Residue left in the bag changing the inclusion rate
- Medicated premix residue carried into standard feed
- No sieve between bag and mixer
- Dust exposure at the untying step
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