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Automatic Filling and Bagging Machines

Bagging Machines

What is a bagging machine?

A bagging machine (also called a sack filling machine or bagging scale) is a weigh-filling system that first weighs a bulk product and then discharges it into an open-mouth bag or sack. While the product waits in a hopper or silo, the machine weighs the target amount for each bag, fills the bag and passes it on to the next step, usually sewing and a conveyor.

When bags are filled by hand with a bucket or on a scale, every bag comes out slightly different: underweight bags lead to customer complaints, overweight bags to product loss nobody notices. A bagging machine narrows that gap and lets you prepare far more bags in the same shift. Meram bagging machines work with ±50–200 g accuracy, depending on the model, on 25–50 kg bags, and the auger model can also fill small bags from 5 kg. The target weight is changed on the weighing indicator, so switching between bag weights needs no mechanical adjustment.

Which bagging machine should I choose?

The first question is how your product flows. That decides the feeding method; capacity is then increased with the number of gates, belts or filling stations. In short:

  • Grain, seed, granular fertiliser: gate models (M-SF1, M-SF2, M-DF1)
  • Pellets, coal, pumice and coarse products: belt models (M-SB1, M-DB1, M-DB2-2L)
  • Flour, ground feed and fine powders: auger model (M-AF1)
  • Simple semi-automatic filling: BM bagging machine

Models at a glance

ModelFeedingSuitable forBagHighlight
M-SF1Single gateGrain, granules25–50 kg200–440 bags per hour
M-SF2Single gateGrain, granules25–50 kgLow–medium output, economical
M-DF1Double gate, two hoppersGrain, granules25–50 kgHighest output of the gate range
M-SB1Single beltPellets, coal, pumice25–50 kg250–400 bags per hour
M-DB1Double beltPellets, coal, pumice25–50 kgFiner dosing
M-DB2-2LDouble belt, two stationsPellets, coal, pumice25–50 kg400–750 bags per hour, 3000 L hopper
M-AF1AugerPowders, poorly flowing products5–50 kgControlled, low-dust filling
BMSemi-automaticOpen-mouth bagsDepends on modelSimple entry-level solution

Gate bagging machines: free-flowing granular products

Grain such as wheat, barley and maize, and granular fertiliser, flow under their own weight. In a gate machine this flow is let into the weigh hopper by opening and closing gates and cut off at the target weight. M-SF1 is the standard single-gate model. M-SF2 is a more economical single-gate option for low and medium output. M-DF1 works with two weigh hoppers: while one empties into the bag, the other weighs the next one, which raises hourly output.

Belt bagging machines: pellets, coal, pumice

Coarse, irregular or fragile products can jam or break in a gate. In belt models the product is carried into the weigh hopper on a belt; because flow is controlled by belt speed, filling stays steady even with irregular products. M-SB1 is the single-belt model. M-DB1 has two belts and suits lines that need finer dosing and higher output. M-DB2-2L, with two filling stations and a 3000-litre hopper, is the highest-output line in the range, suited to coal bagging plants and pellet producers running at high pace all day.

Auger bagging machine: powders and poorly flowing products

Fine powders can bridge in the hopper, do not flow evenly by themselves and raise dust in free fall. M-AF1 doses the product into the bag with an auger, so flow is controlled and less dust escapes during filling. It is used for 5–50 kg bags.

BM bagging machine: semi-automatic

Working semi-automatically with open-mouth bags, BM is a simple starting point for businesses that want weighed filling without building a fully automatic line.

Coarse and fine filling: how is the target weight reached?

In weigh filling, speed and accuracy pull against each other. Filling at full flow is fast, but cutting the flow exactly at the target weight is hard: when the gate closes, product still falling through the air reaches the bag or weigh hopper as well, and the bag ends up heavy. Throttling the flow from the start improves accuracy but slows every bag.

Bagging machines generally solve this with two-stage filling. Most of the fill is done at coarse flow, with a wide opening or high speed. As the target approaches, the flow is reduced and the last part is completed slowly and under control. In a gate model this is done by narrowing the gate opening; in a belt model by slowing the belt; in an auger model by slowing the auger.

The point at which coarse filling switches to fine filling, and the amount of product in flight, vary with the product. That is why a few trial bags are filled and weighed when you first switch to a new product, and the setting is adjusted accordingly. Once a machine is set up, filling accuracy depends largely on how evenly the product flows.

Filling spout and bag holder

How the bag is attached to the filling spout affects both speed and cleanliness around the machine. With open-mouth bags, the bag is pulled over the spout and clamped firmly by a pneumatic bag holder. The holder stops the bag slipping and product escaping around the mouth during filling; when filling ends it releases the bag so it can move on to sewing or the conveyor.

The spout size is matched to the mouth width of the bag. If the spout is narrow for the bag, the bag hangs loose and the holder cannot grip it properly; if it is wide, bags are hard to put on and the operator loses time on every bag. If bags of different widths will be used on the same machine, mention it at the quotation stage. With dusty products, a dust extraction connection around the spout collects the dust that rises with the air pushed out of the bag during filling.

Compare models

ModelOutput capacityWeighing accuracyWeighing range
M-DF1Double Gate Bagging Machine———
M-DB1Double Belt Bagging Machine19 – 22 / 17 – 19 t/h± 50 – 150 gr25 – 50 Kg
M-SF1Single Gate Bagging Machine9 – 12 / 9 – 11 t/h± 50 – 150 gr25 – 50 Kg
M-SB1Single Belt Bagging Machine8 – 10 / 9 – 10 t/h± 50 – 150 gr25 – 50 Kg
M-SF2Economical Single Gate Bagging Machine6 – 7 / 6 – 7 t/h± 50 – 150 gr25 – 50 Kg
M-AF1Auger Bagging Machine6 – 7 / 6 – 7 t/h± 50 – 100 gr—
M-DB2-2LTwo-Station Double Belt Bagging Machine Pro19 – 22 / 17 – 19 t/h± 50 – 150 gr25 – 50 Kg

Models

Applications

Bagging machines are used wherever bulk products are weighed and packed for sale or shipment:

  • Grain stores and traders: bagging wheat, barley, maize and pulses
  • Flour and feed mills: flour, bran, ground and pelleted feed
  • Fertiliser producers: granular and polymer fertiliser
  • Pellets and fuel: wood pellets, biomass and coal
  • Mining and building materials: pumice, sand and ground minerals
  • Coal bagging plants: coal in 25–50 kg sacks before dispatch
  • Seed and plastic granules: uniform, free-flowing products

What to look for when choosing a bagging machine

Two machines filling the same bag weight can perform very differently with different products. These are the points we look at when preparing a quotation:

1. How the product flows. If it flows steadily under its own weight, a gate model is enough. If it bridges in the hopper, forms lumps or flows in bursts, a model that carries the product by belt or auger is needed.

2. Grain size and fragility. Large, irregular pieces can jam in a gate, and fragile pellets break up in a hard-closing gate. With these products, belt feeding protects both the flow and the product.

3. Bulk density and bag volume. 25 kg of grain and 25 kg of pellets do not fit the same bag. Lighter products need larger bags, and the spout and bag size are chosen accordingly. That is why we ask for your product’s bulk density.

4. Moisture and dust. Moist products stick to surfaces and disturb the flow; very dry, fine products raise dust. For dust, auger feeding, a pneumatic bag holder and a dust extraction connection are considered together.

5. Your real output target. It is best to work out hourly output from the daily target: 2,000 bags in an 8-hour shift, once breaks and bag changes are taken into account, calls for a machine above 250 bags per hour. If the target exceeds what one station can do, a double-hopper or two-station model is chosen.

6. The rest of the line. The bagging machine is only one part of the line. If the sewing machine and conveyor do not keep the same pace, the whole line slows to its slowest part.

What makes up a bagging line?

A bagging line is more than the weighing unit. Depending on your needs, these parts are planned together:

  • Hopper or feeder: keeps product reaching the machine evenly
  • Weighing unit: brings the product to the target weight by gate, belt or auger
  • Pneumatic bag holder: holds the bag firmly on the spout during filling
  • Bag sewing machine: closes the mouth of the filled bag
  • Conveyor: carries the bag to sewing and palletising
  • Dust extraction connection: collects dust at the spout with powdery products

Efficiency in figures: the cost of overfilling

The value a bagging machine brings is not measured only in bags per hour. When bags are filled by hand, or by a machine that has drifted out of adjustment, they are often deliberately overfilled a little; underweight bags bring complaints, so the operator leaves a safety margin. That margin looks small but adds up over a year.

A simple example: in a plant filling 2,000 bags a day, if each bag gets an average of 200 g too much, the daily loss is 2,000 × 0.2 = 400 kg. Over 250 working days that is 400 × 250 = 100,000 kg, or 100 tonnes of product. If average overfill comes down to 50 g, the same sum gives 2,000 × 0.05 × 250 = 25 tonnes; the 75 tonnes in between stay in the business as saleable product.

A similar calculation applies to output. A machine’s hourly capacity assumes the line runs without interruption. If an 8-hour shift includes 45 minutes in total of breaks, bag changes and short stops, actual running time is 8 − 0.75 = 7.25 hours. A machine filling 300 bags an hour turns out 7.25 × 300 = 2,175 bags in that shift. Working out your daily target on this realistic time avoids misjudging the machine you need.

Line layout examples

The same machine can be installed in different arrangements depending on the plant layout. Three common examples:

  • Straight line under a silo: product drops from the silo or hopper straight into the machine; full bags travel by conveyor to the sewing machine and on to the stacking point in a straight line. This is the simplest layout where ceiling height allows.
  • Conveyor-fed layout: if there is no room directly under the silo, product is carried by screw, elevator or belt to a hopper above the machine. The bagging point can then sit closest to dispatch.
  • Line with a corner turn: if the hall is too short for a straight line, the conveyor after sewing turns through 90 degrees. Here the conveyor transfer is planned carefully so bags do not topple at the turn.

Whichever layout is chosen, the line’s real speed depends on easy operator access to the bag placing point, a stock of empty bags close at hand and a clear path for full bags to the stacking area.

The operator’s routine for each bag

On semi- and fully automatic lines, the operator’s job is a short cycle repeated for every bag:

  • Pulls an empty bag over the spout and closes the bag holder
  • The machine weighs the target amount, fills the bag and releases the holder
  • The full bag drops onto the conveyor; its mouth is straightened and guided into the sewing machine
  • Meanwhile the operator gets the next empty bag ready

The longest part of the cycle is usually putting the bag on. Stacking empty bags the right way round and within reach saves the operator bending and turning for every bag, which raises hourly output directly.

Maintenance and cleaning

A bagging machine works in a dusty environment and runs for long hours. Regular maintenance protects accuracy and reduces unexpected stoppages:

  • Weigh hopper and spout: product build-up adds to the weighing, so these surfaces are cleaned at the end of the shift
  • Gates, belts and auger: wear on gate edges, belt tension and slip, and build-up on the auger are checked at regular intervals
  • Pneumatic system: the air line is checked for water and oil, and leaking connections are fixed
  • Check weighing: machine accuracy is tested with a known weight or by weighing a full bag on a separate scale
  • Product changeover: when switching products, the hopper and weigh hopper are emptied and cleaned; with products that must not mix, this step is never skipped

What information do we need for a quotation?

To suggest the right model and line layout, just tell us:

  • The product to be bagged and, if possible, its bulk density
  • Bag weight and target bags per hour
  • Whether the bag mouth will be sewn or closed another way
  • Where the product comes from: silo, hopper or conveyor

We reply to quotation requests within 3–4 hours.

Frequently asked questions

Is a bagging machine the same as a sack filling machine?

Yes, both names describe the same machine: a system that weighs bulk product into a bag or sack. The terms “bagging scale” and “weigh filler” are also used. For large bags of 500 kg and more, a separate machine group, big bag filling machines, is used.

How many bags per hour can a bagging machine fill?

Output depends on how the product flows, the bag weight and the machine type. For example, the single-gate M-SF1 fills 200–440 bags per hour and the single-belt M-SB1 250–400. The two-station M-DB2-2L reaches 400–750 bags per hour. Each model page lists its capacity range in the technical table.

Which bag weights does it handle?

Gate and belt models handle 25–50 kg bags; the auger model M-AF1 handles 5–50 kg. For large bags of 500 kg and more, see our big bag filling machines.

What does filling accuracy depend on?

Depending on the model, the machine weighs with ±50–200 g accuracy. Within that range, the result depends mostly on the product’s grain structure and how evenly it flows: uniform grain sits near the lower end, coarse and irregular products near the upper end.

Can it be installed as a line with a sewing machine and conveyor?

Yes. The bagging machine can be set up to work as one line with a bag sewing machine that closes the bag mouth and a conveyor that carries the filled bags away. Just tell us how the bag should be closed when you ask for a quotation.

How is dust controlled with powdery products?

The bag is clamped tightly to the filling spout with a pneumatic bag holder, and a dust extraction connection can be added to the spout. With very fine powders, the auger model raises much less dust than free-fall filling.

Can it be installed under an existing silo or hopper?

Yes. The machine is placed under the silo, hopper or conveyor that feeds the product. The available height and the size of the feed opening are assessed together at the quotation stage.

What needs adjusting when we change product?

If only the bag weight changes, the new target is entered on the weighing indicator; no mechanical adjustment is needed. If the product changes, the switch point between coarse and fine filling is reset for the new product’s flow using a few trial bags. Where products must not mix, the hopper and weigh hopper are emptied and cleaned before the changeover.

How many operators does a bagging line need?

That depends on the line’s level of automation and speed. One operator putting bags on the spout is the core task on most lines; guiding the bag mouth into the sewing machine and stacking full bags are handled by the same person or someone else. As line speed rises, these tasks are shared between more people.

Not sure which model fits?

Tell us the capacity, platform size and site; we will work out the right model and price together.

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