Linear weigh fillers
Good for moderate outputs, multiple products and controlled dry product dosing.
View routeCheckweighing
Checkweigher integration for weigh filling lines
Add finished-pack weight checking to a weigh filling line where tolerance control and inspection matter.
Planning the right weigh filling route
A checkweigher verifies finished pack weight after filling and sealing. It can be used for quality control, reject handling and production monitoring.
Some projects use checkweighing as feedback to optimise filler settings. Others use it as an independent inspection step to remove out-of-tolerance packs.
The decision depends on product value, legal requirements, customer standards and the consistency of the primary filling system.
Key buying checks
- Decide whether checking is advisory or reject-based.
- Allow space for infeed, weigh conveyor and reject.
- Check pack stability at conveyor speeds.
- Plan data, alarms and operator access.
Routes to compare
Machine options to shortlist.
Checkweigher integration is useful where final pack verification is part of the production requirement.
Multihead weighers
Useful where speed, accuracy and product combination are central to the project.
View routeAuger fillers
Often compared for powders, fine ingredients and products that need screw dosing.
View routeVFFS weigh lines
For automatic bag forming, weighing, filling and sealing from film reels.
View routeRelated searches
Useful pages for the same project.
These pages help narrow the specification by product, pack format and machine type.
FAQ
Questions before choosing a weigh filler.
Short answers for production teams comparing dry-product weighing and filling routes.
What information is needed for checkweigher integration for weigh filling lines?
Useful details include the product name, bulk density if known, target fill weight, acceptable tolerance, pack format, output per minute or hour and whether the line must connect to feeding, sealing, capping, labelling or checkweighing equipment.
Which machine type is normally compared for checkweigher integration for weigh filling lines?
Linear weighers, multihead weighers and auger fillers may all be considered depending on product flow, dose size and output target.
Can Lancing help with a complete line rather than a standalone filler?
Yes. Many projects involve product feed, weighing, filling, pack handling, sealing or closing and downstream checking. Sending the full pack route helps avoid choosing a filler that later becomes difficult to integrate.
Send the product, target weight, pack format and output target.
Lancing can advise whether a linear weigher, multihead weigher, auger filler, VFFS line or integrated route is the practical starting point.
Finished-pack verification
Design the mechanical, controls and data interfaces together.
An automatic checkweigher classifies finished packs relative to a nominal set-point. It is downstream verification, not the same instrument or function as the gravimetric filler.
| Interface area | Questions to settle |
|---|---|
| Mechanical transfer | Pack stability, belt height, spacing, speed, guides and enough straight transfer before/after the weighing conveyor. |
| Reject system | Reject type, product/pack suitability, reject confirmation, locked bin, bin-full alarm and what stops the line. |
| Controls | Ready, run, fault, reject, reject confirmed, downstream available, line stop and emergency-stop integration. |
| Recipes | Nominal weight, limits, tare, product code, authority to change and synchronisation with the filler or line PLC. |
| Feedback | Transport delay, trend window, correction limits, filtering and safe behaviour if data is missing or unstable. |
| Records | Accepted/rejected pack data, test packs, interventions, faults, batch and audit export. |
Acceptance test.
- Verify the reference. Use the approved test procedure and suitable test packs or weights.
- Challenge each limit. Confirm under, acceptable and over classifications as applicable.
- Confirm rejection. Test the reject device, confirmation sensor, bin-full state and line stop.
- Run production packs. Record spacing, dynamic results, rejects and any false classification.
- Test feedback separately. Prove delay and correction limits without allowing unstable automatic adjustment.
Legal and QA basis.
Automatic checkweighers and automatic gravimetric filling instruments are distinct instrument categories. Confirm whether the installation is process-only, a packaged-goods control measure or a regulated trade use, and retain the applicable conformity and verification evidence.
Buyer questions
Checkweigher integration questions.
Can the checkweigher use the same target as the filler?
It can use related nominal values, but its classification limits, tare treatment, dynamic correction and legal or QA purpose must be configured for the finished pack.
What signals are normally required?
Typical project signals include ready, running, fault, reject, reject confirmed, reject bin full, downstream available and line stop. The exact interface depends on the controls architecture.
Why is pack spacing important?
Dynamic weighing needs one stable pack in the weighing zone. Touching or unstable packs can corrupt the result and reject timing.
Should rejected packs be included in performance data?
Yes. Keep them in the trial record with the reject reason; accepted-pack statistics alone can hide an unstable filler or handling issue.
Can checkweigher data reduce giveaway?
Trend data can support controlled correction, but the filler, delay and correction limits must be validated. The first priority is a stable feed and weighing process.
Closed-loop control
Feedback needs pack identity, transport delay and bounded corrections.
A checkweigher can show what reaches the finished-pack point, but automatic correction is safe only when the controller can attribute each result to the correct filler cycle and prevent noise or isolated rejects from driving repeated set-point changes.
| Interface element | Engineering question | Failure if omitted | Acceptance evidence |
|---|---|---|---|
| Pack identity | How is each filler discharge associated with the pack weighed downstream, especially with multiple heads, lanes or accumulation? | A result can correct the wrong cycle or lane. | Traceable sequence through normal running, gaps and stops. |
| Transport delay | How many packs or seconds separate filling from dynamic weighing, and can speed change? | Feedback is applied too early or too late. | Verified delay at minimum, normal and maximum line speeds. |
| Correction filter | Does the logic use a controlled trend or average rather than reacting to one pack? | Normal measurement noise creates oscillating set-points. | Documented filter, update interval and response to a planned disturbance. |
| Adjustment limits | What is the maximum correction, total offset and permitted update frequency? | A fault, wrong tare or lost product can drive an unsafe or excessive correction. | Limit tests and alarm behaviour without uncontrolled product release. |
| Reject confirmation | Is the rejected pack positively detected and is bin-full or reject-failure monitored? | A non-conforming pack may remain in production without a confirmed response. | Deliberate reject challenge and fail-safe line response. |
| Data context | Are tare, target, recipe, product, line speed and status stored with each result? | Trend data cannot be interpreted or audited after a changeover. | Export or log showing the required fields and event history. |
Weigh a stable finished pack.
Maintain spacing, guide the pack without touching the weigh conveyor and use the correct dynamic settings for its size, speed and centre of gravity.
Link the result to the correct filler cycle.
Track pack sequence through delays, gaps, rejects and stops before the result is permitted to influence a head, lane, auger pulse or target offset.
Apply a bounded change, then prove its effect.
Use defined limits and filtering, keep the original and corrected values, and verify the following finished-pack trend rather than assuming the command worked.
Commission with controlled challenges.
Within the agreed FAT or commissioning method, challenge pack gaps, downstream stops, a reject, reject-bin-full status, recipe change and a controlled weight trend. Confirm that feedback pauses or resets correctly when pack identity is uncertain.
Accepted-pack statistics must not hide rejected packs or packs lost between filler and checkweigher. Keep every result and event in sequence so the filler, transport and inspection functions can be separated.
Legal and QA boundary.
A dynamic checkweigher may support process control, internal quality checks or a legal-metrology function depending on its specification and use. It does not automatically make the upstream filler calibrated or approved for sale by weight.
Buyer questions
Feedback-control questions.
Should the checkweigher correct every individual pack?
Usually not. A single result may contain normal product, tare or dynamic-weighing variation. Correction logic should use an agreed filtered trend, limits and update interval.
How is the feedback delay established?
It is derived from pack tracking, conveyor speed, distance, accumulation and the number of packs between filler discharge and checkweigher. The delay should be verified across the intended speed range.
What happens if a reject is not confirmed?
The required response should be defined in the risk assessment and controls specification. It may include alarm, line stop or controlled diversion; the system should not silently assume the pack was removed.
Can the dynamic checkweigher calibrate the weigh filler?
No. It can provide finished-pack trend and feedback data, but filler verification, reference-scale checks and any legal approval remain separate activities.