Specifying a VFFS Machine: Film, Product and Speed Requirements to Put in Writing

Reject any quote that offers only a rated maximum speed

A rated maximum is measured on ideal test material, so it does not predict what the machine will do on your product and film. Ask for tested output in writing, on your own product and film.

Treat the rated figure as an ideal-condition number rather than a production target¹. The published bands you will see quoted differ by machine type and application.

Pouch machines are described at 30–80 bags/min standard and up to 200 bags/min in high-speed configurations¹⁴. A flow-wrap source gives 42–132 bags/min standard and up to 400 packages/min for high-speed pharmaceutical work⁹.

A market source describes high-speed form-fill-seal machines at 150–300 packs/min³. Because those figures come from different machine types, none of them can be adopted as your VFFS speed.

You should instead write the specification around a tested figure. Ask the supplier to state the bag size, fill weight and film the test was run on.

A trial run with your own product and film, even at added cost, is reported to be far cheaper than discovering compatibility or accuracy issues after installation²⁷.

Fix the film width and bag-size range in writing

Film width and bag-size range are the specification items that confirm the machine matches your packaging format. They belong in the written specification rather than in a brochure¹.

A peer source gives a working band for vertical packaging machines of 100–620 mm film width and 50–150 microns thickness, with PE, PP and PET composite films as the common materials¹⁵. Use that band as a starting reference when you check a quoted machine, not as a VFFS rule.

The same source does not give a maximum film roll diameter, and no source in this set derives a bag-width range from film width. Before you order, confirm the machine's stated film-width and bag-size range against the bag you actually intend to run.

Ask the supplier to confirm the roll diameter the machine accepts — that figure is not published in the sources reviewed here.

Choose the film structure and seal layer, and accept the seal window as a speed limit

The film's heat-seal temperature window sets how much temperature variation the machine can tolerate, and a narrow window forces slower rates. PE (LDPE/LLDPE) is reported with a wide window of roughly 40°C (120–160°C), which forgives variation.

OPP/BOPP is reported at 120–123°C — a 3°C window — and compostable PLA at a 5–10°C window, both of which are reported to limit production speeds¹⁷. Laminated structures such as PET/PE and Nylon/PE are reported at 130–180°C, and paper/PE at 90–220°C¹⁷.

The practical consequence for your specification is that the film structure and seal layer you name will constrain the speed the machine can hold. Specify the structure and require the supplier to confirm sealing performance on that exact structure rather than on a generic laminate¹⁵.

If you are moving to a compostable or paper-based film, treat it as a speed-constraining choice and ask what temperature control the machine offers. Film testing before purchase matters here: compatibility should not be assumed from datasheets alone, and trials under production conditions are recommended to evaluate the actual sealing window¹⁷.

Match the dosing system to the product, and set the fill-accuracy tolerance

Product behaviour decides the dosing module, so define your product's flow characteristics — free-flowing powder, sticky paste, chunky solid or liquid — before you approach manufacturers¹⁸. Powders and granules may need weighing or volumetric dosing, while liquids may require positive-displacement pump filling¹⁴.

If the product is oily, sticky or viscous, specify the washdown and sanitation level the machine must meet²⁰. Fill accuracy belongs in the written specification because it drives product giveaway and compliance with declared weights¹.

Two peer sources converge on a sub-0.5% dosing tolerance with 99.5% accuracy where the product and dosing method allow¹⁴²⁰. Treat that as a screening target to put to suppliers, not a mandatory grade.

For regulated products, the same source recommends specifying dosing tolerance below 0.5% where required. It also recommends aligning machine design, product-contact areas and cleaning with the applicable GMP, FDA, ISO 9001 and hygiene requirements¹⁴.

Ask the supplier how fill accuracy will be demonstrated on your product — no source in this set states the inspection method used to verify it on a VFFS machine.

Require a sealing method tied to your film, not a generic upgrade

Sealing method is a specification item because it affects seal integrity across film types, and it should be documented in writing¹. Film thickness and product weight drive heat-penetration time and jaw pressure.

Thicker films are reported to need longer heat penetration and higher jaw pressure, and heavy products need thicker or co-extruded structures, which in turn affects tension control and sealing capability²⁵.

Thin film run at high speed is reported to cause film-tracking problems and weak seals, with a speed reduction of 15–20% suggested as a mitigation alongside precision tension control²⁵.

What the sources do not do is compare constant-heat, impulse, ultrasonic or servo jaw options for VFFS, so no jaw-type recommendation can be drawn from this evidence. Your check is therefore to ask the supplier to tie the sealing method they propose to your specific film structure and thickness.

Reject a jaw recommendation that is presented as a general upgrade without that link.

Prove changeover before purchase, and quote the change parts

Many modern machines support multiple products and pouch sizes through programmable recipes and quick-change tooling. Changeover time and film compatibility should be confirmed with the manufacturer beforehand²⁷.

If your operation runs multiple SKUs regularly, prioritising changeover speed during selection is reported to reduce downtime over the equipment's lifespan²⁷. Changeover proof is also reported to carry more weight than broad automation claims during supplier review¹³.

For your specification, ask for the changeover time between the bag sizes and products you actually run. Require the former and dosing change parts to be listed and quoted so they are not a later surprise.

No source in this set lists VFFS former and dosing change parts or gives quantified changeover times between bag sizes or product types, so the figures you receive will be supplier-specific.

Screen compliance evidence during sourcing, not after installation

Verifying compliance after a machine is installed on your production floor is reported to be far more disruptive than screening for it during sourcing, so request the documentation upfront²⁹. The applicable standard set depends on your industry and market.

No source establishes which certification is mandatory for a VFFS machine in any jurisdiction.

• ✓Request certifications and material data sheets upfront, before the order.
• ✓Ask the supplier to state which certifications apply to your industry — CE, UL, food-grade compliance if applicable.
• ✓Identify the applicable GMP, FDA, ISO 9001 and hygiene requirements before specifying the line.
• ✓Confirm machine design, product-contact areas, dosing controls and cleaning align with those standards.
• ✓Ask whether CIP/SIP is required for your product and cleaning regime.

Where the published speed figures disagree

The published bands below come from different machine types and applications, which is why they cannot be reconciled into one VFFS figure. Use the disagreement as the reason to demand a tested number on your own product and film rather than adopting any band.

What the sources do not establish

• No source gives maximum film roll diameter or a bag-width range derived from film width for VFFS machines.
• No source gives a VFFS-specific film thickness range or a seal-layer specification standard.
• No source quantifies product bulk density, dust or abrasiveness limits for dosing systems.
• No source provides a VFFS speed derating curve for heavier or larger bags, or speed tied to a specific bag size and fill weight.
• No source compares constant-heat, impulse, ultrasonic or servo jaw types for VFFS or their film/product compatibility.
• No source states the inspection method used to verify fill accuracy on a VFFS machine.
• No source lists VFFS former and dosing change parts or quantified changeover times between bag sizes or product types.
• No source establishes which certification (CE, UL, 3-A, FDA, USDA) is mandatory for a VFFS machine in any jurisdiction.
• No source provides a VFFS-specific supplier evaluation or total-cost model for procurement.