Combination weighing

Combi Weighers

Compact vibratory weigher for small doses up to ~100 g. Ideal for coffee beans, tea, seeds and similar products.

Range5–100 g
SpeedUp to 10 packs/min
Accuracy±0.5–3 g
Best forCoffee, tea, seeds, sachets and small hardware packs
Technical specifications

Headline specifications for Weigh Filling Machine 100.

Range
≈5–100 g (application‑dependent)
Accuracy
≈±0.5–3 g (typical)
Speed
Up to ≈10 packs/min
Hopper
Compact stainless hopper
Control
Micro‑computer; vibratory feed
Discharge
Adjustable outlet
Voltage
110/220 V, 50–60 Hz
Power
≈300 W (typ.)
Materials
Stainless steel
Footprint
Small benchtop
Options
Date coder, foot pedal
Applications
Coffee beans, tea, seeds
Typical applications

Where this machine fits best.

Coffee & tea

Beans, loose‑leaf, sachets.

Snacks

Seeds, small nuts (size permitting).

Hardware

Small parts and fasteners.

What's included

  • Main weighing base
  • Hopper
  • Outlet/funnel kit
  • User manual
Sizing the solution

Information to include with your enquiry.

Using the structure already present in the supplied product pages, the site prompts buyers to send better application data from the start.

  • Product flowability and target dose
  • Pack style (pouch/jar) and spout size
  • Throughput requirement (packs/min)
  • Space and discharge height
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Operating questions

Questions about the weighing calculation, hopper population and discharge cycle.

These questions explain why the calculation cannot be separated from the physical product path. The controller can only choose from the portions that the feed system has created and made available at that moment.

What is the combination calculation trying to achieve?

The calculation compares the available hopper weights and selects a permitted combination that approaches the target under the configured rules. It does not correct poor feeding by itself. The quality of the result depends on having enough useful, repeatable portions in the hoppers and on the agreed tolerance and discharge logic.

Why does the average portion in each hopper matter?

The hopper portions need to be small and varied enough to create useful combinations without being so light or unstable that the feed cycle becomes inefficient. If most hoppers are empty, overloaded or nearly identical, the controller has fewer practical choices. Feed amplitude and distribution should be tuned against the real product and target.

Can software settings fix poor product distribution?

Settings can refine vibration, timing and control behaviour, but they cannot remove every mechanical or product limitation. An uneven bulk feed, bridging product, unsuitable tray geometry or excessive retained product may require a change to the feed arrangement or contact surfaces. The symptom should be observed before increasing vibration indiscriminately.

What is a retained or booster hopper used for?

A retained or booster hopper is an additional storage position used in some combination-weighing arrangements to keep an already weighed portion available for later calculations. Whether it is useful depends on the application and machine design. It should not be assumed to improve every target or product without a representative trial.

When can a timing hopper help below a multihead weigher?

A timing hopper can buffer a completed dose close to the downstream machine until that machine is ready. It can reduce the final transfer distance and separate the weighing cycle from part of the packer cycle, but it also adds a gate, control sequence and cleaning point that must be included in the acceptance test.

Related guidance

Application review

Review the product path before choosing the configuration.

A useful review includes the normal product range, target weights, pack opening, output and line-control sequence.

Request a configuration review
Accuracy and output evidence

Define how weight control and sustainable output will be measured before comparing claims.

Accuracy, giveaway and throughput are related but different results. A useful acceptance method records ordered pack weights and the conditions under which they were produced, while also checking product quality and the complete packing-line cycle.

MeasureWhat it answersConditions to record
Target and toleranceWhat result is commercially acceptable for each packDeclared target, permitted limits and applicable site/market requirements
Mean weightWhether the process average is above, below or close to targetOrdered sample, scale/check method and product batch
Minimum and maximumThe observed spread during the test periodSample size, stops, restarts and whether any result was excluded
GiveawayHow much product is added above the agreed target or process basisCalculation method and treatment of rejects or incomplete cycles
Good finished packs per minuteThe sustainable line output rather than the theoretical weighing cycleFeed, bagger/pouch machine, inspection, operator work and short stops
Product qualityWhether the weighed and discharged product remains acceptableBreakage, coating loss, segregation, scuffing and pack presentation

Is accuracy the same as product giveaway?

No. Accuracy describes how results compare with the agreed target or reference, while giveaway describes excess product above the chosen basis. A process can show a narrow spread but still run with an unnecessarily high average, so both need to be reported.

Why can headline weighing speed differ from finished-pack output?

The weigher may wait for product, a timing hopper, a bagger or pouch machine. Pack opening, sealing, inspection, operator handling and short stops can determine the real line rate. Record good finished packs over a representative period.

How large should the acceptance sample be?

The sample size should be agreed before testing and be large enough to expose normal refill, product variation, stops and restarts. There is no universal number for every project; use the commercial, quality and regulatory context of the actual pack.

Can installation affect weighing performance?

Yes. Product feed, support, vibration, contact, access, drop height and packer timing can all affect the finished result. Use the installation and site-preparation guide before the interface is frozen.

Acceptance brief

Send the test method with the product and pack.

Include the target, tolerance, sample size, output definition, product-quality checks and the intended downstream machine.

Request an acceptance review
Combination and multihead weighing

Specify the complete weighing process, not only the head count.

A multihead or combination weigher is selected around product distribution, the target weight, the pack route and the evidence required from a sample trial.

How combination weighing works

Product is introduced to a central distribution area and metered across feed trays towards individual hoppers. Each weigh hopper holds a portion. The controller evaluates the available portions and discharges a combination that approaches the programmed target weight. The quality of that result depends on the product reaching the hoppers consistently and on enough suitable portions being available for the calculation.

The dispersion cone, feed trays, hopper geometry and feeder settings therefore matter as much as the weighing algorithm. Large pieces can restrict hopper capacity, light products may need more volume, dusty products can affect movement, and oily or sticky products may need different contact surfaces. Dimpled surfaces can help some products release, but they are not a universal solution and must be assessed against cleaning and product-damage requirements.

Accuracy, target weight and product giveaway

Accuracy should be discussed with a defined product, target weight, tolerance, operating rate and sampling method. Product giveaway is the amount packed above the commercial target; it is influenced by feeder control, the number and spread of available portions, product consistency and the downstream process. A realistic trial should record the mean, minimum and maximum pack weights, variation, rejects and the amount of excess product over the agreed target.

Head count, hopper volume and product size

More heads can provide more possible combinations, but the correct configuration also depends on hopper volume, piece size, target dose and required output. Hopper capacity must allow the product to enter and discharge without bridging or damage. A fragile snack may need controlled feed amplitude and lower drop heights, while pellets or small hardware may need attention to noise, impact and wear.

Timing hopper and packaging interface

A timing hopper can buffer the completed dose and release it when the downstream machine is ready. On a VFFS line, the weigher and bagger need a reliable signal exchange so the dose is discharged only when the bag is correctly formed and open. With pre-made pouches, the pouch must be presented, opened and supported before the product drop. The interface should also account for alarms, product starvation, reject handling and safe access.

Cleaning and changeover

Confirm how product-contact parts are removed, accessed and cleaned, how change parts are identified, and whether dry cleaning, wet cleaning or allergen controls apply. Cleaning time should be observed during a trial where changeover is commercially important. Contact materials and surface finish should be agreed for the actual product and sector.

Sample trial and quotation inputs

Evidence to collect before the specification is frozen.

Representative product

Use normal production material and include the full piece-size distribution. Record bulk density if known, fragility, seasoning, dust, moisture and any batch-to-batch variation.

Defined test conditions

State the target weight, tolerance, desired output, feeder settings, pack route, number of test cycles and how results will be measured. Headline accuracy or speed is not meaningful without these conditions.

Acceptance criteria

Agree the acceptable average, minimum and maximum weights, giveaway, reject level, product damage, stoppages, changeover time and any checkweigher or downstream requirements before the final acceptance run.

What products are normally considered for a combination weigher?

Free-flowing snacks, pellets, granules, beans, seeds and small components are common starting points. Product size, stickiness, dust and fragility still need to be checked using representative samples.

Does a higher head count always produce a better result?

No. Head count is one factor. Hopper volume, target weight, product distribution, feeder control, piece size and the downstream timing requirement all affect the practical result.

How is product giveaway assessed?

Run a defined number of cycles under stated production conditions, compare actual pack weights with the agreed target and record the mean excess weight as well as the overall variation and rejects.

How are fragile products protected?

Review feed amplitude, surface finish, hopper geometry, discharge sequence, timing hopper and total fall height. The trial should inspect visible breakage as well as weight performance.

Can a multihead weigher feed a VFFS machine?

Yes, when the support frame, discharge path, timing hopper and control signals are designed around the bagger. The specialist VFFS route is covered by Lancing Form Fill & Seal.

What should be sent with an enquiry?

Send product samples or detailed product information, target weight, tolerance, pack dimensions, output target, available floor space, utilities and the proposed upstream and downstream equipment.

Combination performance evidence

Stable results depend on the population of portions available to the calculation.

The controller can only select from the portions actually present in the weigh hoppers. Product distribution, portion spread and the relationship between average piece weight and target weight therefore affect the number of useful combinations, the cycle time and the amount of product above target.

Build a useful hopper population

Feed settings should create a spread of portions around the values needed for the target rather than repeatedly filling every hopper to the same unsuitable amount. If some heads remain empty, overloaded or slow to refill, the controller has fewer practical combinations to choose from.

Check the target-to-piece relationship

Large individual pieces can create unavoidable weight steps. A pack target that is close to only a few pieces may show more variation than a target made from many smaller pieces. Record the piece-size window and inspect whether the agreed tolerance is realistic for the product itself.

Assess feed stability over time

Run long enough to include hopper replenishment and normal product variation. A short test immediately after manual loading may not show starvation, surging, build-up or segregation that appears during sustained production.

Choose product-contact surfaces from evidence

Smooth surfaces can suit free-flowing products, while dimpled or other finishes may help release in specific applications. The choice should also consider cleaning, product marking, coating loss and whether product remains in corners or on gates.

Coordinate the completed dose

A timing hopper can separate the weighing cycle from the pack-machine request, but its capacity, opening time and discharge path must suit the product. The weigher, timing hopper and downstream machine should share clear ready, release, complete and fault states.

Report both weight and product quality

The test report should include mean, minimum and maximum weights, variation, giveaway and rejects together with product damage, mix quality, spillage, stoppages and achieved finished-pack output.

Trial measureWhy it mattersCondition that must be recorded
Mean pack weight and giveawayShows the commercial amount packed above the agreed targetTarget, tolerance, sample count and checkweigher method
Minimum, maximum and variationShows the spread rather than a single favourable resultProduct batch, settings and sustained operating period
Usable hopper populationIndicates whether product is being distributed into useful portionsHead activity, refill behaviour and product level
Finished-pack outputConfirms the whole line rather than the isolated weighing headPack format, timing hopper, bagger or pouch cycle and rejects
Product qualityPrevents weight performance masking breakage or segregationBefore-and-after samples and an agreed inspection method
What does head count change?

It changes the number of portions that may be available to the combination calculation. The benefit still depends on useful product distribution, hopper volume, target weight and product size.

How is hopper volume selected?

It is selected around product volume, largest piece, target weight and required output. The product must enter, settle and discharge without bridging, overflow or unacceptable damage.

What is product giveaway?

Giveaway is product packed above the commercial target. It should be measured across an agreed sample under stated conditions rather than inferred from a single pack.

Are dimpled surfaces always preferable?

No. They may improve release for some products, but surface choice must also account for cleaning, product damage and retention.

What should a representative trial include?

Normal product variation, the real target and pack, sustained feed, the intended downstream interface, weight statistics, damage checks, stops and cleaning observations.

Combination-weigher review

Send the product window and the acceptance criteria.

Include piece-size variation, target weight, tolerance, output, pack opening and the proposed VFFS or pouch interface.

Plan a product trial
Multihead weigher engineering guides

Improve the specification by separating product behaviour, weighing performance and line performance.

The strongest buying decisions use representative product and measurable acceptance criteria. The guides below cover the issues that most often determine whether a combination-weighing project performs consistently in production.

Plan the product trial

Define sample variation, test duration, weight data, damage checks and finished-pack criteria.