Why dosing matters more than the bagger
The bag-forming part of a packing machine is similar across many products. The dosing device is what decides accuracy, how gently the product is handled and how much product you give away per bag.
Multihead weigher
A multihead weigher has many small weigh buckets. A computer picks the combination of buckets closest to the target weight. It is the standard choice for snacks, nuts, frozen food and other irregular pieces. Examples: 420Z / 520Z multihead weigher VFFS packing system, KA granule filling machine for jars and cans.
Auger (screw) filler
An auger turns a set number of revolutions to deliver a volume of powder. It suits fine, non-free-flowing or dusty powders such as milk powder, flour, cocoa and spices. Examples: 720F screw-metering powder VFFS machine, 300F powder stick & sachet packing machine, F2 powder & granule jar filling and capping machine.
Volumetric cup filler
Adjustable cups are filled level and emptied into each bag. It is simple and fast for uniform, free-flowing granules such as sugar, salt and seeds, where the bulk density is stable. Example: 450K vertical granule packing machine.
Pumps for liquids and pastes
Piston pumps and liquid pumps dose sauces, juices and pastes into sachets or pouches. Examples: 240J liquid & sauce sachet packing machine, 420J / 520J liquid & sauce VFFS machine.
Summary
| Product | Typical dosing |
|---|---|
| Chips, nuts, candy, frozen pieces | Multihead weigher |
| Flour, milk powder, spices, protein | Auger filler |
| Sugar, salt, rice, seeds, pellets | Volumetric cup or linear weigher |
| Sauce, honey, juice, gel | Piston or liquid pump |
Questions and answers
Is a weigher always more accurate than volumetric dosing?
For irregular pieces, yes. For uniform granules with stable density, volumetric cups can be accurate enough at lower cost. The source specifications list packing accuracy of about ±1% for many of our machines, depending on product.
