Product behaviour
Check viscosity, foam, particles, settling, temperature, abrasiveness, corrosiveness and cleaning requirements.
Buyer guide
How to choose a volumetric filling machine.
A practical checklist for deciding whether piston, pump or cup filling is the correct route before you request a quotation.
Decision framework
Five checks before selecting a machine.
Fill range
Confirm minimum and maximum dose, container opening, nozzle count and whether volume adjustment needs recipe control.
Accuracy route
Decide whether volumetric repeatability is enough or if net-weigh verification is needed for trade-weight products.
Output target
Compare bottles per minute against operator loading, capping speed, labelling speed and downstream packing.
Cleaning & changeover
Review contact parts, product swaps, allergen risk, washdown, CIP expectations and tool-less changeover needs.
Integration
Plan bottle infeed, conveyors, capping, labelling, coding, inspection, guarding, accumulation and discharge.
Specification notes
What to put in your enquiry.
A strong brief lets Lancing UK compare the machine route faster and avoid over-specifying or under-specifying the filler.
- Product name, viscosity, temperature, particles and cleaning needs.
- Container type, size range, neck/opening and closure type.
- Fill volume range and target accuracy expectation.
- Target output, current bottleneck and available floor space.
- Existing machinery to connect with or future line stages to allow for.
Technology comparison
Common filling principles.
| Principle | Where it works well | Watch-outs | Typical automation level |
|---|---|---|---|
| Piston volumetric | Viscous liquids, sauces, creams, gels and repeatable doses | Product particles, cleaning and cylinder/nozzle sizing | Semi automatic to fully automatic |
| Volumetric cup | Free-flowing granules and consistent bulk-density products | Bulk-density variation and product flow stability | Automatic or integrated with bagging/bottle filling |
| Peristaltic pump | Clean liquid path and easier tubing changeover | Flow rate and tubing compatibility | Bench, semi automatic or compact line |
| Gear/rotor pump | Flowing liquids and viscous products where pump control is preferred | Product compatibility and cleaning route | Semi automatic to automatic |
FAQs
Buyer questions.
No. Start with product behaviour, fill accuracy, output and changeover needs. A cheaper machine that cannot handle the product or pack format can cost more once production issues are included.
Accuracy depends on product, dosing principle, fill volume and setup. Piston systems can provide strong repeatability when the product is suitable and the machine is configured correctly.
Move to automatic when labour cost, output target, consistency, queueing at capping or labelling, or finished-pack presentation requires continuous line control.
Related machinery pages
Continue narrowing the filler specification.
Need a volumetric filler shortlist?
Send your product, fill volume, container, throughput target and any downstream equipment needed. Lancing UK will help narrow the best machine route before quotation.
Dosing-method comparison
Compare the measurement principle before comparing machine prices.
The strongest specification explains what is being measured, how product behaviour can disturb that measurement and how the result will be verified. The table below separates the main routes without claiming that one method is universally best.
| Method | How quantity is controlled | Typical strengths | Important limitations and changeover points |
|---|---|---|---|
| Piston displacement | A cylinder and piston displace a defined volume; stroke and cylinder size establish the working range. | Positive displacement for liquids, creams, sauces, gels and many viscous products; controlled delivery and a wide choice of shut-off nozzles. | Valve and nozzle clearances must suit particles; seals and product-contact parts require compatibility; cylinder, valve and nozzle cleaning form part of changeover. |
| Peristaltic pump | Rollers compress calibrated tubing to move a repeatable volume per controlled cycle. | Product remains inside the tube, supporting rapid product-path changes and small-volume hygienic applications. | Tubing material, internal diameter, wear, occlusion, viscosity and flow limit matter. Tubing replacement and calibration are part of changeover. |
| Flowmeter filling | A meter measures flow and closes the valve when the target integrated volume is reached. | Useful for suitable flowing liquids and larger continuous fills where direct measured flow is appropriate. | Meter technology must suit conductivity, viscosity, air and solids. Minimum flow, straight pipe requirements and cleanability need specialist review through Liquid Fillers UK. |
| Time-pressure filling | Product flows for a set time under a controlled pressure or head. | Simple product path and useful dosing for suitable low- to medium-viscosity liquids, especially in smaller systems. | Quantity can move when pressure, head, temperature, viscosity or restriction changes. Supply stability and frequent verification are important. |
| Volumetric cup dosing | A fixed or adjustable cup captures a defined volume and discharges it. | Mechanically simple, fast dosing for free-flowing granules with stable bulk density. | The mass changes with bulk density; levelling, product feed and cup fill consistency matter. Cups and product-contact areas require cleaning and format adjustment. |
| Weigh filling | A load cell measures mass and stops coarse/fine feed at the target. | Direct mass control where product density changes or the sale quantity is governed by weight. | Feed behaviour, vibration, settling and cut-off in flight affect results. For specialist selection use Weigh Fillers UK. |
| Fill-to-level | The nozzle controls the visible liquid level rather than dispensing a fixed volume. | Consistent shelf appearance where container internal volume varies and a common level is preferred. | It is not a defined-volume method. Bottle finish, return path, foam and product suitability must be assessed. |
Accuracy and repeatability
Write the test method before accepting a performance figure.
Accuracy is the difference between the measured result and the target. Repeatability is the spread of repeated results under unchanged conditions. A useful test therefore records individual fills and the conditions that created them. Reporting only one average can conceal underfills and overfills.
Prepare a stable test
Use representative product at the agreed temperature and mixing condition. Confirm product supply, machine warm-up, container tare or volume measurement, nozzle height and speed. Identify any deliberate pauses, refills or restarts.
Retain the statistical evidence
Keep every reading, then calculate the mean, minimum, maximum, range and the agreed measure of variation. Separate results by head where the machine has multiple nozzles. Record rejects rather than removing them from the data without explanation.
Test the production boundaries
Repeat the check at the smallest and largest dose, normal and maximum intended speed, and after relevant changeovers. Where temperature, density or particles vary, use the boundary condition that is most likely to challenge the process.
Failure-mode review
Use the pattern in the results to find the cause.
| Observed pattern | Checks to make before changing the machine |
|---|---|
| All fills are consistently high or low | Calibration, stroke or pump setting, density conversion, measurement method and product temperature. |
| Results drift during the run | Supply level or pressure, product warming or cooling, air entrainment, tubing condition, hopper agitation and valve timing. |
| One head differs from the others | Head-specific setting, cylinder or tube condition, valve restriction, nozzle blockage, air leak and container position. |
| Good quantity but poor presentation | Nozzle diameter and shut-off, suck-back, diving motion, fill speed, headspace and downstream bottle contamination. |
| Good short test but low sustained output | Product replenishment, bottle infeed, capper or labeller bottleneck, operator loading, reject handling and cleaning interruptions. |
Buyer questions
Technical questions for a defensible buying decision
These answers explain the checks that normally need to be completed before a machine configuration can be confirmed.
Accuracy describes closeness to the target quantity. Repeatability describes how tightly individual results group together. A machine can repeat consistently but remain offset from target until it is calibrated.
Retain the individual readings, mean, minimum, maximum, range and an agreed measure of variation. Record product temperature, density where relevant, machine settings, speed and sample method so the result can be reproduced.
The delivered amount depends on pressure, valve-open time and flow resistance. Changes in product level, viscosity, temperature, restriction or supply pressure can therefore change the dose.
No. Meter type, conductivity, viscosity, air bubbles, solids, minimum flow and cleaning requirements all matter. The exact meter and product should be reviewed by the specialist liquid-filling route.
Each product and pack combination that changes the dosing path, cylinder or cup, nozzle, speed or handling should have an agreed test. Boundary formats are especially important.
Separate calibration error from variation. Then examine product supply, temperature, air, stroke or pump setting, valve timing, nozzle cut-off, container position and the measurement method before changing machine type.
Turn the application into a testable specification.
Provide the acceptance method as part of the enquiry so the machine trial can be built around measurable production evidence.
Results and acceptance
Use one results sheet to separate bias, spread and head-to-head variation.
A filling trial becomes useful procurement evidence only when each individual result can be traced to the target, filling head, sequence and production condition. A single average cannot show whether the process is centred, whether the spread is acceptable or whether one head behaves differently.
| Measure | Definition | What it can reveal |
|---|---|---|
| Signed error | Measured result minus target | Whether an individual fill is above or below target and whether the process has consistent bias. |
| Absolute error | The magnitude of signed error without the plus or minus sign | How far each result is from target, but not the direction of the difference. |
| Mean | Sum of individual results divided by the number of results | The centre of the sampled process. It must be considered with the spread and sample conditions. |
| Minimum, maximum and range | Lowest result, highest result and the difference between them | Immediate visibility of the observed envelope and unusual extremes within the sample. |
| Sample standard deviation | A statistical measure of spread around the sample mean | Comparison of repeatability between controlled conditions when the sample method and units are consistent. |
| Coefficient of variation | Sample standard deviation divided by the mean, multiplied by 100, when the mean is not zero | A relative spread measure that can help compare different dose sizes, subject to suitable data and interpretation. |
| Head-specific mean and range | The above measures calculated separately for each filling head | Systematic head imbalance that would be concealed by pooling all results together. |
These calculations describe the sample; they do not create an acceptance limit. The purchaser and supplier should agree the target, tolerance, sampling frequency, measurement method, product condition and treatment of start-up or restart fills before the test.
Acceptance wording
Write the conditions beside the numerical requirement.
A defensible acceptance statement identifies the machine configuration, product and batch condition, dose, container, measuring instrument, sample size, head distribution, production speed and run state. It also states whether start-up, pause, replenishment and low-level samples are included, and how any rejected or reworked pack is recorded.
Quantity basis
State whether the result is assessed by mass, volume or count. When a volumetric dose is checked by mass, record product density and temperature because a density change can alter mass without a corresponding change in delivered volume.
Sample identity
Number results in production order and retain head, recipe, timestamp or run stage. This makes trends, drift, head imbalance and restart effects visible rather than reducing the test to an anonymous list.
Decision and deviation
Define the pass rule and the action if a result falls outside it. Record adjustment, repeat test and final disposition instead of deleting an inconvenient result from the data set.
Minimum results-sheet fields
- Product, batch, density and filling temperature.
- Target, unit and agreed tolerance.
- Machine, cylinder or pump, head and nozzle.
- Recipe or mechanical setting and line speed.
- Individual result, signed error and run sequence.
- Start-up, steady, pause, restart and replenishment status.
- Instrument reference and measurement resolution.
- Adjustment, deviation and acceptance decision.
Connect the evidence to the specification
Use the filling accuracy guide for condition-dependent performance language, the product-testing page for sample planning and the URS template to place the agreed method into the purchase specification. Keep the original raw data with the final summary.
Agree the test method before comparing quotations.
Provide the product, pack, target, tolerance and production conditions so Lancing can define which filling principles and evidence should be compared.
Final comparison layer
Compare the measurement principle before comparing automation level.
Piston, flowmeter and time-pressure systems can all be described as controlled liquid filling, but they create the dose in different ways. The correct shortlist depends on the stability of displacement, flow, pressure and product condition.
Piston versus flowmeter
Compare mechanical displacement with measured flow across viscosity, dose range, pressure drop and cleaning.
Read comparisonPiston versus time-pressure
Compare defined displacement with timed delivery from a controlled pressurised supply.
Read comparisonTrial and terminology
Use one controlled test protocol and shared definitions across the specification, FAT and SAT.
Open trial protocolThe volumetric filling glossary defines the technical terms used throughout these guides.
Buyer questions
Questions that make filling-machine comparisons more defensible
A strong buying decision uses the same product, test method and acceptance language across every supplier being considered.
What should a buyer ask during a filling-machine demonstration?
Ask which product condition is being demonstrated, how the dose is measured, what settings are fixed, what parts would change for other packs and which stops or interventions are excluded from the displayed cycle. Request evidence from the smallest and largest required fills and ask to see start-up, restart and normal running rather than only a short steady-state sequence.
- Confirm the product feed source and hopper level.
- Ask whether each filling head has been assessed separately.
- Record nozzle, speed, pressure and recipe settings.
How can quotations be compared when suppliers use different test conditions?
Quotations cannot be compared fairly until the product, pack, fill range, output definition and acceptance method are aligned. Convert each proposal into the same requirement sheet and identify every qualification, exclusion and untested condition. Where one supplier quotes a catalogue figure and another reports a product trial, treat those as different evidence levels rather than equivalent numbers.
The filling-machine URS template provides a consistent structure for the comparison.
Which production conditions should be treated as worst case?
The worst case is the approved condition most likely to challenge product flow, refill, cut-off, container presentation or cleaning. It may be the coldest paste, the warmest foaming liquid, the largest normal particle, the lowest hopper level, the smallest neck opening, the shortest dose or a restart after a planned stop. More than one boundary may need to be tested.
- Define worst case from the real process rather than from product name.
- Include planned product and format changes.
- Use the same boundaries during FAT, SAT and operator training.
What evidence should be retained after a successful filling trial?
Retain the product identity and condition, container and closure references, machine configuration, change parts, recipe, feed arrangement, individual results, trial video or photographs, cleaning observations and the agreed acceptance decision. The record should be detailed enough for the accepted process to be reproduced later and for a deviation to be distinguished from a changed product or setting.
The trial-report guide explains how to interpret the result set.
Continue the technical review
Open the question centre · Define the trial protocol · Plan FAT and SAT · Read the trial evidence
Build one evidence standard for every supplier.
Send the product and pack boundaries with the required acceptance method so Lancing can respond against a clear, comparable brief.
Related technical guidance
Specification and evidence tools
Use the worksheets and test guides to compare suppliers on the same product, pack and acceptance basis.
Selection matrixCreate a practical dosing-method shortlistURS templateRecord the user requirement before quotationCost and TCO factorsCompare more than the purchase priceTrial protocolDefine samples, conditions and retained evidenceAccuracy test guideSeparate bias, repeatability and head variationProduct feed stabilityControl supply pressure, air and hopper conditionStart-up and restart fillsCheck priming, pauses and resumed productionTechnical glossaryUse consistent filling terminology
Buyer evidence
Questions that turn a broad filling enquiry into a measurable brief.
How will realistic output be tested?Define cycles, accepted packs and the line bottleneck.What does the accuracy claim mean?Separate target bias from individual-fill spread.How will quantity be verified?Agree tare, density, equipment and records.Which temperature represents production?Trial the condition at the filling point.Has every wetted material been approved?Review product and cleaning exposure.Is dry-product bulk density stable?Compare cup volume with delivered mass.