Choosing a VFFS packaging machine starts with your target daily bag count, not the machine's top-rated speed — working backward from real output avoids paying for capacity you'll never use. The specification that looks impressive on a data sheet often isn't the one that determines your actual daily throughput.
How do you calculate the speed you actually need?
Divide your daily bag target by your actual operating hours (accounting for changeovers and downtime) to get a realistic bags-per-minute figure, then add roughly 20% headroom for growth. A machine rated at 120 bags/min running at 60% duty cycle in practice often produces less usable daily output than a well-run 80 bags/min line running near full duty cycle.
What bag width range fits your product line?
Bag width sets your packaging format flexibility. A machine like our PK-VFFS covering 80–320mm handles most snack, powder, and small-hardware SKUs without a format-part change.
| Product type | Typical filler | Typical bag width |
|---|---|---|
| Powder (flour, spice) | Auger filler | 80–180mm |
| Granular (rice, snacks) | Multihead weigher | 120–260mm |
| Liquid/paste | Piston filler | 100–220mm |
Granular, powder, or liquid — does it change the machine?
Yes — dosing systems differ by product type (auger fillers for powder, multihead weighers for granular, piston fillers for liquid), so confirm your filler type matches your product before ordering. Running the wrong filler type against your product is the single most common cause of buyer's remorse on a first VFFS purchase.
What changeover time should you budget between SKUs?
A well-specified machine with quick-change format parts should switch between similar bag sizes in under 30 minutes; switching filler types (say, powder to granular) is a bigger job and may require a half-day of recalibration. If you run more than 4-5 SKU changeovers per shift, ask specifically about tool-less format-part swaps before ordering.
What film specifications affect which machine you need?
Film thickness and material (PE, laminated, or high-barrier films) affect sealing temperature range and jaw pressure requirements — a machine specced for thin PE film may struggle to get a consistent seal on thicker laminated barrier film without adjustable heat-seal parameters. Confirm the film gauge range and sealing temperature range the machine supports against the actual film you plan to run, not a generic film sample the factory provides for demonstration.
How much does footprint and utility requirements matter for your facility?
Beyond the machine's own footprint, budget floor space for infeed conveying, a bag-collection area, and operator access on at least two sides for maintenance — a machine that fits on paper often doesn't fit once these access zones are added. Also confirm compressed air consumption (CFM) and electrical requirements before ordering; retrofitting a facility's air compressor capacity after the machine arrives is a common and avoidable delay.
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