When Should You Add a Second Filling Line? Scaling on Utilization, Not Forecasts?

Views: 154 Author: Howie SUN Publish Time:
The same frame can carry gravity, volumetric or isobaric valves, which is why two machines that look alike can behave differently on the same product. Scale when utilization stays above ~75%, lead times slip, or a second SKU outgrows shared capacity.

Mechanical Hot-fill Filling Machine for Glass Bottle Juice & Tea Drinks

Key facts at a glance
What is includedFilling, capping and closing equipment
Filling principlesGravity, volumetric, isobaric, piston, load cell
Capacity2,000-48,000 BPH by configuration
Accuracy basisVolume, weight or fill level
MaterialSUS 304 product contact, CIP-ready
Key controlFill accuracy, closure integrity, CIP time

Which filling principle fits this product?

Filling principle comes from the product, not from the target BPH. Still liquid at a steady density runs gravity or volumetric; carbonated product needs isobaric; thick product with solids needs a piston; product sold by weight runs a load cell. A machine picked ahead of the product usually gets picked again.

Let confirmed demand — not forecasts — trigger line two; a water production line at 80% utilisation is the classic trigger.

What is the real changeover cost?

The parts cost is small; the time is not. A format change touches star wheels, guide rails, grippers, the cap chute and the recipe. On a line with two formats and two changes a day, the annual hours lost exceed the price of a second small machine in many plants.

Scale when utilization stays above ~75%, lead times slip, or a second SKU outgrows shared capacity.

PrincipleDoses byFails when
GravityFill level in the bottleBottle geometry varies
VolumetricChamber volumeValve seal wears
IsobaricVolume under counter-pressurePressure or temperature drifts
PistonDisplacementProduct carries solids
Load cellNet weightProduct temperature moves

The Gravity Filling Machine for Still Water is the matching unit when this becomes a line project.

Which documents belong in the handover pack?

Wiring and pneumatic diagrams, the spare parts list with lead times, the changeover checklist, the CIP recipe and the acceptance record. A line handed over without those five is a line that depends on the engineer who installed it.

The unit behind this configuration is the Volumetric Filling Machine for Still Water.

When is a second filler cheaper than a faster one?

When the formats are far apart or the cleaning regimes conflict. Two smaller fillers each run at their own rate and can be cleaned independently. One large flexible filler carries every changeover on the critical path, and its downtime is the plant downtime.

The same question is worked through from another angle in How Mechanical Fillers Reduce Maintenance Needs.

How to read the numbers. The capacity tab on the specification sheet gives ranges; treat them as such. Changeover, CIP and downstream stops sit outside a rated BPH, so plan on 0.65-0.85.

Frequently asked questions

How accurate is a filling machine?

It depends on the principle and the product. A volumetric or load cell filler holds a tighter band than gravity on a variable bottle. The tolerance belongs in the acceptance protocol, measured by weight on a defined sample.

How long does a CIP cycle take?

From tens of minutes to over an hour, set by the circuit volume and the soil. It is a fixed cost per production day and should be planned as downtime, not squeezed into the shift.

Why does the fill level vary between bottles?

Bottle capacity variation, product temperature, valve wear or foam. On glass, mould-to-mould capacity variation alone is enough to make level filling inconsistent, which is why glass lines often check-weigh.

What is the difference between rated BPH and real output?

Rated BPH is a steady-state figure at one format. Real output subtracts changeover, CIP, label changes and downstream stops, which is why planning uses a factor of 0.65-0.85.

Key takeaways
  1. The product picks the filling principle; the output only picks the size.
  2. Each closure family needs its own capping head.
  3. CIP is downtime; it belongs in the capacity plan, not in the maintenance schedule alone.
  4. Line enquiries rarely specify the neck finish, and it is the item that decides the most change parts.
About the author
Written by the Sunswell engineering team - led by Howie SUN, Founder & CEO, with 14 years in filling and blow-moulding equipment R&D and turnkey project delivery across 71+ countries.
Last reviewed: 2026-08-28 . Reviewed by Sunswell engineering team
×

Contact Us

captcha

*We respect your privacy. When you submit your contact information, we agree to only contact you in accordance with our Privacy Policy.

×

Inquire

*Name
*Email
Company Name
Phone/Whatsap
*Message

*We respect your privacy. When you submit your contact information, we agree to only contact you in accordance with our Privacy Policy.