Pre-Made Bag Filling Machines
Pre-made bag filling machines automate the process of filling and sealing bags that have already been formed and supplied in stacks or on rolls. Unlike form-fill-seal machines that create bags from roll stock, these systems work with pre-formed bags including stand-up pouches, flat bags, gusseted bags, and zipper reclosure bags.
Filling Process
The machine picks a bag from the magazine or unwinds from a bag-on-roll supply, opens the bag mouth using vacuum cups or mechanical grippers, fills the bag with product through the open top, and seals the bag closed. Rotary configurations move bags through multiple stations around a central turret, while inline configurations process bags in a straight-line sequence.
Rotary vs. Inline
Rotary machines position bags around a central carousel with dedicated stations for bag pickup, opening, filling, settling, and sealing. This design achieves higher speeds by performing multiple operations simultaneously on different bags. Inline configurations process bags sequentially along a straight conveyor, offering simpler operation and easier access for changeover and maintenance.
Filling Methods
The filling system is selected based on product characteristics. Volumetric fillers meter consistent product volumes for free-flowing granular materials. Auger fillers handle powders and fine-grained products. Net weigh fillers provide the highest accuracy by weighing each fill. Liquid pump fillers dispense liquids and viscous products through nozzles positioned inside the bag opening.
Specifications
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