How this product class behaves
The typical process uses gravity, flowmeter or sanitary pump filler supplied through a balance tank or closed transfer from the preparation vessel. The equipment should be configured to control splashing, aeration and product foaming at the nozzle.
Before discussing speed or automation, define the actual operating window: minimum and maximum dose, product temperature, density, viscosity or bulk density, inclusions, foam, shear sensitivity, corrosivity, pack dimensions and closure. A single nominal sample is not enough for a robust specification.
Recommended filling technologies
Primary route
Gravity, flowmeter or sanitary pump filler.
Product supply
A balance tank or closed transfer from the preparation vessel.
Critical control
Control splashing, aeration and product foaming at the nozzle.
Temperature and product condition
Ambient or controlled cool fill unless the validated process requires heat. Temperature changes may alter viscosity, foam, gas breakout, dose accuracy, closure performance or pack stability. Define where temperature is measured and the permitted deviation.
Cleaning, changeover and material compatibility
Plan for drainable product paths with a documented wash and changeover routine. Product-contact materials, elastomers, lubricants, surface finish and drainage should be reviewed against every formulation. Include safe access, line clearance, product recovery and waste handling.
Principal production risks
Risk focus
Drips, foam, inaccurate cut-off and contamination at exposed transfer points. The process and machinery risk assessments should cover normal running, refill, sampling, adjustment, blockage clearance, cleaning and maintenance.
What to prove in a product trial
- Repeatable dose at minimum and maximum line speed
- Clean cut-off and acceptable pack presentation
- Stable product feed through refilling and batch end
- Changeover and cleaning time using the intended method
- Closure, label, code and distribution performance after filling
Example product applications
Whole Milk in Glass Bottles
Free-flowing liquid
Dairy & cultured foodsWhole Milk in PET Bottles
Free-flowing liquid
Dairy & cultured foodsWhole Milk in HDPE Bottles
Free-flowing liquid
Dairy & cultured foodsWhole Milk in Preformed Pouches
Free-flowing liquid
Dairy & cultured foodsWhole Milk in Bag-in-box Packs
Free-flowing liquid
Dairy & cultured foodsSemi-skimmed Milk in Glass Bottles
Free-flowing liquid
Dairy & cultured foodsSemi-skimmed Milk in PET Bottles
Free-flowing liquid
Dairy & cultured foodsSemi-skimmed Milk in HDPE Bottles
Free-flowing liquid
Dairy & cultured foodsSemi-skimmed Milk in Preformed Pouches
Free-flowing liquid
Dairy & cultured foodsSemi-skimmed Milk in Bag-in-box Packs
Free-flowing liquid
Dairy & cultured foodsSkimmed Milk in Glass Bottles
Free-flowing liquid
Dairy & cultured foodsSkimmed Milk in PET Bottles
Free-flowing liquid
Common questions
Which filling machine suits a free-flowing liquid?
A gravity, flowmeter or sanitary pump filler is the normal starting point. Final selection depends on dose, accuracy, product feed, temperature, pack, cleaning, contact materials and required output.
Why are product samples needed before specifying a filler?
Published viscosity or density values do not show aeration, particles, stringing, shear sensitivity, temperature effects or interaction with the nozzle and pack. A representative test exposes these issues before manufacture.
Can one machine cover several product viscosities or formats?
Often yes, within a defined operating window. The specification should identify the easiest and most difficult products, smallest and largest doses, every pack height and diameter, and the acceptable changeover method.
How is filling accuracy confirmed?
Agree whether the target is volume or mass, the permitted tolerance, test method and sampling frequency. Measure warm-up, hopper refill, speed changes and end-of-batch conditions rather than only stable running.
What determines the real line speed?
The slowest repeatable operation governs output. Product refill, container loading, filling time, closure handling, label application, rejects, accumulation, cleaning and operator intervention all affect the sustainable rate.