Positive-displacement filling is commonly used where a repeatable dose is needed for thick, sticky or non-free-flowing products.
Positive-displacement filling is commonly used where a repeatable dose is needed for thick, sticky or non-free-flowing products. The right machine route is usually decided by the product path, dosing method, nozzle shut-off, cleaning access and how the container moves through the line.
This page is for producers, manufacturers and contract packers filling pastes, creams, sauces, gels, honey, adhesives and sealants into jars, bottles, tubs, pots, cartridges and pails. It highlights the practical details that affect accuracy, mess, changeover and line speed.
For thick or difficult products, the filling method should be selected after reviewing viscosity, dose size, particle content, temperature, product contact requirements and output target.
The filler can be planned as a stand-alone machine or linked with conveyors, cap handling, labelling, coding and packing where production needs a complete route.
Clear product and pack information helps shortlist the right paste filler and avoids specifying a machine that is too small, too slow or unnecessarily complex.
Photos of the product, container, closure and any existing filling setup are also useful when planning the route.
These pages help compare product type, automation level and line integration before you request a quote.
Compare the main paste filler routes.
View page →Check specification points before quotation.
View page →Send product, container and output details.
View page →The suitable filler depends on viscosity, dose size, container, temperature, product behaviour and output target. Many pastes, creams, sauces, gels, honey, adhesives and sealants applications need positive-displacement paste filling with a hopper, valve and nozzle arrangement matched to the product.
Useful details include the product, fill volume, container dimensions, closure type, target output, cleaning requirements, photos of the pack and whether filling only or a complete line is required.
Yes. Paste filling equipment can be planned as a stand-alone filler or as part of a wider line with conveyors, capping, labelling, coding and accumulation.
Send your product, container, fill volume, closure and target output. Lancing can help compare the practical options before quotation.
Positive displacement describes a family of dosing and transfer methods. Piston, rotor-lobe, progressive-cavity and gear-pump routes can all move a defined amount of product, but they differ in valve requirements, pressure, shear, cleanability and how the dose is controlled.
| Method | Application strengths | Important limitations to test |
|---|---|---|
| Piston cylinder | Direct measured displacement; practical for repeatable batch doses across many sauces, creams, gels and pastes. | Valve passage, cylinder refill, particles, seal wear, product temperature and strip-down access. |
| Rotor-lobe pump | Gentle pump-fed movement and a relatively open product path can suit viscous or particulate products. | Product slip, pump speed, particle clearance, seal compatibility, hose or pipe losses and how the delivered dose is measured. |
| Progressive-cavity pump | Smooth, low-pulsation transfer can suit some viscous, stringy or shear-sensitive products. | Stator compatibility, dry-running protection, cleaning, residual product, pressure and calibration of the dose. |
| Gear or other displacement pump | Compact controlled transfer may suit compatible smooth products and continuous supply arrangements. | Shear, clearances, abrasive particles, chemical compatibility, product heating and clean-down. |
A pump may move a thick product, yet the resulting pressure can increase stringing, leakage or product damage. Check the entire path from feed vessel to nozzle, including restrictions, hose length and valve timing.
Some emulsions, gels and particulate products can change texture when pumped repeatedly. A trial should compare the filled product with the original batch, not only confirm that it reached the container.
Map wetted parts, seals, cavities, hoses and dead legs. A pump that fills well may still be unsuitable if residues cannot be removed within the required changeover window.
State whether dose is set by piston displacement, pump revolutions, time, flow measurement or a weight check. The calibration method and verification frequency should be agreed in the specification.
Lancing publishes a rotor-lobe reference configuration with a stated 5–5000 ml range and multi-nozzle options. Treat that as model-specific reference data and reconfirm suitability by product trial.
The best comparison asks which method is least likely to trap particles, aerate the product, damage texture, drip at the nozzle or create excessive cleaning time.
Viscosity change, particles, shear, curing, abrasion and temperature.
Small openings, unstable containers, headspace, neck cleanliness and closure fit.
Refill limits, clean-down, product recovery, operator access and downstream bottlenecks.
No. It can provide a more open path, but particle size, clearance, shear, product slip and the nozzle still need testing. Piston systems can also handle some particulate products with suitable valves.
It can provide smooth low-pulsation transfer for some viscous products. Suitability depends on stator and seal compatibility, dry-running protection, pressure and cleanability.
The machine may control revolutions, displacement, time or measured flow, then verify the result by a defined sampling method. The control method should be stated in the quotation.
No. Viscosity, temperature, particles, shear and chemistry affect pump performance. A representative trial is required when the product range is broad or difficult.
Length, diameter, bends and restrictions change pressure loss, refill time and product hold-up. They also affect cleaning and product recovery.
Ask for a timed product trial, dose results, cut-off video, product-condition record, cleaning demonstration and a written list of wetted materials and change parts.
A fair trial uses the same batch condition, dose, container and quality checks for each candidate route. The aim is not to prove that one pump family is universally best, but to identify which method creates the lowest product, pack and changeover risk for the application.
| Evidence item | Piston route | Rotor-lobe route | Progressive-cavity route |
|---|---|---|---|
| Prime volume and hold-up | Measure product needed to charge the hopper outlet, valve and cylinder before stable fills. | Measure pump, hose or pipe and nozzle hold-up, including any recirculation or feed vessel connection. | Measure product in the suction path, stator, discharge hose and nozzle and define how it is recovered. |
| Particle passage | Check the narrowest valve and nozzle restriction and whether valve movement traps or damages pieces. | Check lobe clearance, pump speed, downstream restrictions and whether particles remain evenly distributed. | Check rotor-stator passage, pressure and whether inclusions affect dose stability or stator wear. |
| Texture and shear | Compare product after chamber refill and discharge, particularly where valves accelerate or compress the product. | Compare product after the intended pump speed and number of passes through the line. | Compare product after the full pressure path and a realistic run, not only a short first sample. |
| Dose control | State cylinder module, stroke or servo position and the method used to verify delivered quantity. | State whether dose is based on revolutions, displacement, time, flow or weight feedback and how slip is accounted for. | State rotor control, calibration, pressure condition and the verification method applied to each production recipe. |
| Nozzle cut-off | Test valve closure and suck-back against chamber pressure and time between containers. | Test pump deceleration, shut-off valve and residual hose pressure at stop and restart. | Test pump stop, pressure relaxation, shut-off and the effect of product elasticity on stringing. |
| Cleaning and restart | Witness cylinder, valve and nozzle strip-down, residual product and the first stable fills after reassembly. | Witness pump access, seal areas, pipe or hose cleaning, drainage and the restart after the path is refilled. | Witness rotor-stator cleaning, protection from dry running, retained product and the restart sequence. |
The same product can behave differently when hose length, nozzle restriction, pump speed or temperature changes. Record the complete test arrangement so a successful factory result can be reproduced on site.
Pressure is created by the product and the restrictions after the dosing device. Review feed vessel, suction condition, bends, hose diameter, valve timing and nozzle bore. A pump capable of producing pressure is not automatically suitable for the product or pack.
Temperature can change viscosity, seal behaviour, product slip, chamber refill and cut-off. Record the operating window and compare fills at the conditions expected during a real batch.
Define how the machine is stopped with product in the path, how useful product is recovered, the maximum permitted dwell time and the steps required before the next safe, stable fill.
Use the piston filler page for chamber-and-valve detail, the nozzle guide for cut-off evidence, the sample test guide for a common comparison sheet and the cleaning guide for product-path acceptance. Lancing’s published rotor-lobe filling reference can support an initial shortlist, but the buyer’s witnessed product trial and quotation remain the application authority.
Yes, provided a representative product sample and operating condition are available. Record temperature, batch age, particles, settling, stringing and observed refill or pressure behaviour so the trial can be repeated.
Retain an unfilled control sample and compare appearance, texture, particle condition or another buyer-defined quality measure after a realistic run and number of passes through the product path.
They affect startup waste, batch yield, cleaning time and the practicality of short runs. A method with good fill performance may still be uneconomic if too much product remains in hoses, cavities or pumps.
It may be useful where net mass is the controlling requirement, density varies or large doses make a gravimetric check practical. The correct route should be reviewed with Lancing gravimetric filling guidance rather than assumed from the pump type alone.
Two positive-displacement methods can deliver the same nominal quantity while treating the product very differently. Compare pump speed, valve restrictions, recirculation, agitation, suction conditions and how long product remains in the wetted path.
Check whether texture or viscosity changes after repeated pumping and whether the product recovers before pack inspection.
Compare the largest normal inclusion with every opening and moving interface through the complete product path.
Record temperature before and after filling where heating, friction or residence time can change flow or quality.
Use the shear-sensitive product filling guide and sample test protocol before selecting a pump route.
Hard particles or mineral fillers can affect piston seals, cylinder surfaces, pump clearances, valve seats, hoses and nozzle mechanisms. Compare methods using the actual formulation, duty and inspection plan rather than assuming that one pump family is abrasion-proof.
