Two machine types do the same job — fill a bag and seal it — but they get there in completely different ways. Choosing the wrong one costs you either on film, on labour, or on the bag formats your customers ask for. This guide sets out the decision in plain terms.
How a vertical form-fill-seal (VFFS) machine works
A VFFS machine takes a flat roll of film, forms it into a tube around a forming collar, seals the vertical seam, fills the product through the tube, and seals and cuts the bag at the bottom. Everything happens in one continuous vertical flow.
- You buy film, not bags. Packaging material usually costs less per pack than ready-made pouches.
- Bag size is set by the machine and the forming tube. Changing to a very different bag size is a mechanical change, not a software one.
- Best fit: pillow bags, sachets, stick packs, gusseted bags and simple quad seals, filled with powder, granules, snacks, coffee or tea.
How a rotary premade pouch machine works
A rotary machine picks a finished pouch from a magazine, opens it, fills it, seals it and discharges it — all at stations arranged around a rotating table. Because the pouch already exists, the shapes you can run are limited only by what your pouch supplier can make.
- You buy finished pouches — often with printing, zippers, spouts or valves already applied.
- Format flexibility is high. Stand-up pouches, doypacks, flat bottom bags, spouted pouches and shaped pouches are all normal work.
- Best fit: premium retail products where the bag itself is part of the brand, and where heavier or larger packs are involved.
The five questions that decide it
- Does the bag need a zipper, spout or valve? If yes, premade pouches are the practical route — forming those features from roll film is not something a standard VFFS machine does.
- What is the pack weight? Light sachets and small pillow bags favour VFFS. Larger, heavier retail packs generally favour premade pouches.
- How many SKUs and bag sizes? Frequent size changes favour premade pouches, because the pouch dimension comes from the supplier rather than from machine tooling.
- What is your material budget? Roll film is usually cheaper per pack; premade pouches cost more but arrive printed and ready.
- What does the shelf look like? If the pack has to stand on a retail shelf, a stand-up premade pouch is usually the answer.
Quick comparison
| Factor | VFFS (roll film) | Premade pouch (rotary) |
|---|---|---|
| Bag source | Film roll, formed on the machine | Finished pouches from a supplier |
| Typical formats | Pillow, sachet, stick, gusset, quad seal | Stand-up, doypack, flat bottom, spouted, zipper |
| Format change | Forming tube and sealing jaws | Mostly pouch size and machine recipe |
| Material cost per pack | Usually lower | Usually higher |
| Print quality | Limited by film printing process | High — pouches are printed before filling |
Where people get it wrong
The most common mistake is buying a VFFS machine and then discovering the marketing team wants a stand-up pouch with a zipper. The second most common is buying a rotary machine for a low-cost sachet product where pouch cost per unit eats the margin. Both are expensive to fix later, so settle the bag format first and the machine second.
What to send us
Product type and density, target pack weight, the bag style you want, and roughly how many packs per minute you need. With those four points we can tell you which machine type fits — or whether both could work and the choice comes down to material cost.
Send your product details and we will come back with a recommendation.
Related reading: vertical form-fill-seal machines · rotary premade pouch machines