M-SF2 Economical Single Gate Bagging Machine

Who is it the right machine for?

The M-SF2 is aimed at businesses that bag not continuously all day but as orders come in, or in concentrated bursts at harvest. Typical users include grain traders working at village and district level, seed dealers, cooperative stores, small flour and feed mills and fertiliser dealers. In these businesses the real problem is often not speed but the fact that hand-filled bags all come out different, and the labour spent standing at the scale.

With hand filling, a worker fills the bag with a bucket or scoop, weighs it on a platform scale, then removes the excess or tops up the shortfall. That cycle can take minutes per bag. The M-SF2 takes over weighing and filling at the same time; the operator only puts the bag on and takes the full bag away.

How the M-SF2 differs from the M-SF1

Both models have one gate and one weigh hopper, and both handle the same product group. The difference lies in the load each machine is sized for:

• Output: the M-SF2 works at a steady pace of about 270 bags per hour, which means 6–7 tonnes an hour with 25 kg bags. The M-SF1 can reach up to 440 bags per hour.
• Hopper: the M-SF2 top hopper holds 500 litres, the M-SF1 hopper 1800 litres. The small hopper means the M-SF2 should sit close to the silo or feed conveyor and be fed continuously.
• Weight and space: the 750 kg frame rests on a lighter support structure than the 1,400 kg M-SF1, which makes placement easier in stores with limited ceiling height.
• Accuracy: weighing accuracy is ±50–200 g on the M-SF2 and ±50–150 g on the M-SF1. The 50 g difference means different things depending on bag weight, as explained below.

In short: if your daily target does not exceed 270 bags per hour and your buyer is not very strict about bag tolerance, the M-SF2 covers the need. When output or tolerance expectations go beyond that, moving to the M-SF1 makes more sense.

What does ±50–200 g mean in practice?

Relating accuracy to bag weight makes the figure meaningful. For example, a 200 g deviation on a 50 kg bag is four parts per thousand of the bag weight (200 / 50,000 = 0.004). On a 25 kg bag the same 200 g is eight parts per thousand. So the M-SF2 offers a tighter ratio on heavy bags and a looser one on light bags. Since much of the grain trade uses 50 kg bags, this ratio is acceptable to most buyers.

Which end of the range you land on is decided by the product itself. Products with round, even grains, such as polymer-coated fertiliser and clean grain, flow smoothly through the gate, and the result moves towards the lower end. With a high share of broken grains, straw or dust, flow becomes irregular and deviation grows. That is why, during commissioning, we weigh the first bags on a separate scale and set the fine filling point to suit your product. When the product batch changes, for example a new harvest or a different type of fertiliser, repeating the same check with a few bags keeps deviation near the lower limit.

Installation and daily operation

The M-SF2 runs on 400 VAC, 50–60 Hz three-phase power and 8–10 bar compressed air; the table assumes a 300-litre compressor for the air supply. If you already have a compressor, simply check that its capacity covers the movements of the gate and bag holder.

A 500-litre hopper holds roughly half a tonne of grain, which is a buffer of about ten 50 kg bags. If the feed stops for a moment, the machine runs empty within a few bags. The M-SF2 should therefore sit directly below a silo outlet or at the end of a continuously running screw conveyor or elevator. Because the hopper volume is defined as variable, a larger hopper can be discussed in the quotation if your feed is intermittent.

Day to day, the operator sets the bag weight on the touchscreen. When switching from grain to fertiliser, the hopper and weigh hopper must be emptied completely and swept out; fertiliser residue mixing into grain is unacceptable. Fertiliser tends to absorb moisture and stick to surfaces, so on fertiliser days the gate edges and the inside of the hopper need cleaning more often.