Prime and start-up
Product used to fill the pump, hose, manifold and nozzle before stable production.
Liquid filling yield and product loss
Reduce filling waste by measuring where product leaves the approved pack route.
Product loss is not only residue left in the tank. It includes priming, hose and manifold hold-up, overfill, drips, start-up rejects, cleaning displacement and product that cannot be released after a stop. A simple mass balance turns these losses into engineering decisions.
Loss map
Separate planned process use from avoidable loss.
The same kilogram should not be counted twice as hold-up, flush or reject.
Residual hold-up
Product remaining in the source, pipework, pump, valves and nozzles at normal batch end.
Overfill
Product consistently placed above the approved target or control requirement.
Drip, splash and foam loss
Product on the machine or pack exterior and packs rejected because presentation is unacceptable.
Stop and restart
First-off packs, drained product or line contents that cannot be released after an interruption.
Cleaning and changeover
Product displaced into waste, mixed interface material and cleaning solution requiring disposal.
Mass balance
Use one agreed batch boundary and disposition for every output.
A mass balance does not decide whether material may be reused; it shows where the material went.
| Record | How to define it | Decision supported |
|---|---|---|
| Product issued | Verified mass or volume entering the defined filling process, including replenishment. | Creates the total input boundary. |
| Good packed product | Number of released packs multiplied by the measured or approved quantity basis. | Shows saleable or releasable output. |
| Rejected packs | Separate quantity error, damaged pack, contamination, closure, label and other causes. | Distinguishes filling losses from downstream or material problems. |
| Recoverable product | Material collected under an approved, traceable procedure and awaiting disposition. | Supports quality review without assuming rework is permitted. |
| Cleaning or flush stream | Product-bearing displacement or cleaning material measured or estimated consistently. | Shows the effect of path length and changeover method. |
| Unaccounted difference | Input minus all defined outputs, with measurement uncertainty stated. | Highlights missing measurements, leaks, residue or inconsistent records. |
The UK waste hierarchy places prevention before reuse, recycling, recovery and disposal. Apply it within product-quality, safety and regulatory controls; it does not authorise recovered material to be returned to production. See the GOV.UK waste hierarchy guidance.
Engineering controls
Reduce loss without creating cleaning, quality or safety risk.
Reduce unnecessary hold-up
- Size hoses and manifolds for the duty rather than adding avoidable length or volume.
- Provide controlled drainage or disconnection where the product and hygiene assessment permit it.
- Choose a metering route that can be emptied, displaced or changed over in a defined way.
- Measure residual product during the trial instead of assuming “low waste”.
Reduce quantity and reject loss
- Set targets using a suitable quantity-control procedure rather than compensating with chronic overfill.
- Stabilise source conditions, prime and nozzle shut-off.
- Test pause and restart and replenishment.
- Separate filler rejects from container, capping, labelling and handling losses.
Recovery boundaries
Recovered product needs an approved disposition route.
Product recovery can introduce contamination, mix-up, allergen, concentration, temperature, traceability or degradation risk.
- Identify the stream: define exactly where and when product is collected.
- Protect identity: label product, batch, time, equipment state and collection method.
- Assess quality and safety: use the site's approved procedure and competent decision maker.
- Define permitted use: return, rework, downgrade or disposal must be authorised for that product and sector.
- Prevent informal reuse: do not rely on operators deciding that visibly clean product is acceptable.
- Record the outcome: include recovered and disposed quantities in the mass balance.
Questions buyers ask
Questions about product recovery and filling waste.
How is liquid filling product loss measured?
Set a batch boundary, measure product issued, good packed product, rejects, approved recovered material and cleaning or flush streams, then calculate the unaccounted difference with measurement uncertainty. Use the same method before and after a change.
What is hold-up volume in a liquid filling machine?
Hold-up is product retained in the source outlet, hose, pump, cylinder, valves, manifold and nozzles at a defined end condition. Measure the complete configured path because nominal component volumes may not equal recoverable residue.
Can residual product be returned to the batch?
Only under an approved product-specific quality and traceability procedure. Collection can introduce contamination, dilution, temperature change, allergen or mix-up risk, so recoverability must not be assumed from appearance alone.
Does weight filling eliminate overfill?
No. Weight control can support quantity measurement, but target policy, cut-off delay, in-flight product, scale behaviour, tare, product flow and pack compliance still need to be defined and verified.
Which filling-machine features can reduce changeover waste?
Useful features may include a shorter product path, controlled drainage, removable hoses or tubes, suitable manifolds, defined displacement, clean shut-off and accessible product-contact parts. Their suitability depends on the hygiene and product-recovery assessment.
What waste data should be collected during a filling trial?
Record prime quantity, stable-run rejects, overfill distribution, drips or spills, product left at batch end, material displaced during changeover and first-off packs after restart. State the trial batch size and configuration.
Related guides
Connect yield to quantity control, cleaning and acceptance.
Measure the current loss route
Send batch, product-path and changeover information for review.
Include product value or sensitivity where relevant, batch size, source vessel, path dimensions, target quantity, current rejects and cleaning sequence so the trial can measure the correct losses.