Bagging Scale for Fertiliser and Feed Mills in Nigeria

Fertiliser blending plants and feed mills sell product in 25 kg and 50 kg bags, and every bag is a promise to the customer. Underfilled bags cause complaints and regulatory trouble; overfilled bags quietly give away product on every shift. A bagging scale for fertiliser and feed mills fills each bag to a set weight automatically, faster and more consistently than filling by hand on a platform scale.

This guide explains how bagging scales work, what to look for and how to build a simple, reliable bagging line.

How a bagging scale works

Most open-mouth bagging scales follow the same sequence:

1. Product flows from a bin or silo into a weigh hopper (net weighing) or directly into the bag (gross weighing).
2. A controller runs fast feed until the weight is close to target, then slow "dribble" feed for accuracy.
3. Feeding stops at the target weight.
4. The operator places a bag on the spout and a clamp holds it.
5. The weighed product drops into the bag, the clamp releases and the bag moves on to closing.

Load cells under the hopper or spout measure weight continuously, and the controller learns to correct for the product still in the air when the gate closes.

Main types of bagging scale

Automatic bagging / filling scales

Kira's automatic bagging / filling scale for 25 kg to 50 kg bags handles free-flowing products such as granular fertiliser, grains and pelleted feed. Weighing happens in a hopper while the previous bag is being filled, which keeps throughput high.

Open-mouth bag fillers

An open-mouth bag filling machine for 50 kg fertiliser and feed is built for tough, dusty and sometimes corrosive products. It suits blending plants in Kano, Kaduna and Kogi and feed mills in Ogun, Oyo and Plateau.

Small-pack fillers

For premixes, concentrates and retail packs, a semi-automatic powder and grain packing machine, 1 kg to 5 kg fills smaller bags by weight.

What to look for in a bagging scale for fertiliser and feed mills

Product flow

Granular fertiliser and pellets flow freely and suit gravity feeders. Mash feed and powders can bridge or flood; they may need a belt or screw feeder and agitation. Tell the supplier exactly what you are bagging.

Corrosion resistance

Fertiliser is hard on steel. Stainless contact parts, sealed load cells and protected electrics last much longer in blending plants. Clean down regularly.

Dust control

Feed and fertiliser dust is a health hazard and coats electrics. Look for dust extraction points on the spout and a sealed controller enclosure.

Accuracy and speed

Ask how the scale performs on your product at your target speed, and test before acceptance. Accuracy and speed trade off against each other; aim for consistent bags rather than the highest bag count.

Controller features

Useful features include target weight presets, automatic in-flight correction, bag counting, totals per shift and data output for reports.

Completing the line: closing and check-weighing

A filled bag is not finished until it is closed and checked.

• Closing – a bag closing conveyor with column sewing head carries bags straight from the filler to stitching. Smaller operations use a handheld closer; see our bag closer sewing machine guide.
• Check-weighing – spot-check bags on a separate, calibrated heavy-duty platform scale. This confirms the bagger is on target and gives you records if a customer complains.
• Incoming material – weigh raw materials on a weighbridge so you can reconcile tonnes in against bags out. See our industrial weighbridge range.

Calibration and legal metrology

Bags sold by weight must contain what the label says. Calibrate the bagging scale after installation and on a regular schedule, and check it daily with known test weights. Scales used for trade should carry Weights and Measures verification. Kira provides certified calibration and supplies calibration test weights (Class M1) for daily checks.

Common bagging problems

1. Bags drifting overweight – product build-up on the hopper or gate; clean and recalibrate.
2. Inconsistent weights – irregular feed from the bin; check for bridging and moisture in the product.
3. Slow filling – gate settings too cautious; adjust fast/slow cut-off points.
4. Load cell faults – often caused by moisture, corrosion or welding on the frame. Kira supplies replacement load cells.
5. Dust leaks at the spout – worn bag clamp seals or poor extraction.

What drives cost?

We do not publish fixed prices here. Cost depends on bag size range, output per hour, product type, stainless versus painted construction, feeder type, dust extraction, controller features and whether you need a full line with conveyor and closing. See the product pages for current pricing or request a quote.

Why Kira Scales

Kira Scales has supplied weighing equipment to agro-processing plants in Nigeria since 2015, from weighbridges at the gate to bagging and closing at the end of the line. We serve all 36 states and the FCT and handle calibration, load cell replacement and support. Browse our full product range.

Planning a bagging line? Tell us your product, bag sizes and target output. Call or WhatsApp +234 803 435 4829, email sales@kirascales.com or request a quote.