Second-Hand vs New Filling Lines: A Risk-Aware Buyer's Guide

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A filling machine is specified from the product and the package, and every other number follows: viscosity and carbonation pick the valve, the neck finish picks the capper. This guide weighs second-hand vs new so B2B buyers make a risk-aware call, whether for a Combiblock or a single filler.

Volumetric Aluminum Can Filling Machine for Hot-fill Juice and Tea Drinks

Key facts at a glance
Supply scopeFilling, capping and closing equipment
Filling principlesGravity, volumetric, isobaric, piston, load cell
Capacity2,000-48,000 BPH by configuration
Accuracy basisVolume, weight or fill level
Contact 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.

How does the closure change the filler specification?

The capping head is built for one closure family. A screw cap, a crown and a ROPP cap need different heads, different heights and different checks. Changing closure after the line is ordered means a new head, and sometimes a new bottle finish, not a setting change.

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

A different bottle format means a different unit; see the Gravity Filling Machine for Still Water.

What does CIP take out of production time?

A CIP cycle is measured in tens of minutes to over an hour depending on the circuit and the soil. It is not production time, and a plan that counts it as production will miss its daily output every day. The number belongs in the capacity calculation, not in the shift handover.

Where this becomes a line rather than a single machine, the Volumetric Filling Machine for Still Water is the starting point.

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.

The same question is worked through from another angle in How to Reduce Maintenance Costs in Filling Lines.

How to read the numbers. Every figure in this note is a reference range from the product specification, not a guaranteed output. A rated BPH is one format at steady state. Changeover, CIP and downstream stops sit outside it, so size on 0.65-0.85.

Frequently asked questions

What is the difference between volumetric and gravity filling?

Gravity fills to a level set by a tube, so accuracy depends on the bottle. Because volumetric filling doses by chamber volume, accuracy holds across bottle sizes. Gravity is simpler and cheaper; volumetric is more repeatable when the bottle changes.

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.

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 spare parts should be kept in stock?

Valve seals, piston seals, capping head inserts, guide rail blocks and one set of change parts for the second format. These are the items that stop a line for days when they fail.

Key takeaways
  1. Fill accuracy is a temperature and wear question as much as a machine question.
  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. When the formats are far apart, two small fillers often beat one flexible one.
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
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